WO2022214094A1

WO2022214094A1 - Network handover method and apparatus

Info

Publication number: WO2022214094A1
Application number: PCT/CN2022/085952
Authority: WO
Inventors: 李文正; 朱强华; 吴问付
Original assignee: 华为技术有限公司
Priority date: 2021-04-09
Filing date: 2022-04-08
Publication date: 2022-10-13
Also published as: CN115209489B; CN115209489A

Abstract

Provided in the present application are a network handover method and apparatus. The network switching method comprises: a first network element determining a plurality of first serving networks, and a priority corresponding to each of the first serving networks; the first network element determining, according to the priority corresponding to each of the first serving networks, a target serving network from among the plurality of first serving networks; and the first network element sending first request information to a second network element, wherein the first request information is used for requesting the handover of a terminal device to a target serving cell, and the target serving cell belongs to the target serving network. By means of the network handover method and apparatus provided in the present application, the network performance of a target serving network and the network performance of a target serving cell to which a terminal is handed over can be improved, thereby guaranteeing the network quality of the terminal during moving.

Description

A kind of network switching method and device

This application claims the priority of the Chinese patent application with the application number 202110381955.6 and the application title "A method and device for network switching" filed with the China Patent Office on April 9, 2021, the entire contents of which are incorporated into this application by reference .

technical field

The present application relates to the field of communications, and more particularly, to a network switching method and apparatus.

Background technique

Connection management (connection management, CM) consists of two parts, the establishment and release of the NAS signaling connection between the UE and the AMF. The NAS signaling connection is used for NAS signaling interaction between the UE and the core network. The NAS signaling connection includes the signaling connection between the UE and the RAN and the N2 connection between the RAN and the AMF. The signaling connection between UE and AMF in 5GS has two states: CM-IDLE state and CM-CONNECTED state.

The UE is in the CM-IDLE state before joining the network. After the UE selects an available serving network and an available cell to join the network according to the network and cell information broadcast by the RAN, the UE transitions from the CM-IDLE state to the CM-CONNECTED state.

When the UE in the CM-CONNECTED state after joining the network moves between serving cells belonging to different service networks and a handover occurs, the source RAN will select the target service network for handover according to the UE's measurement and reporting information of the wireless signal quality of multiple cells. The target serving network selected by the source RAN according to the measurement report information of the UE cannot guarantee the network performance of the UE.

Therefore, there is an urgent need to propose a method for improving the network performance of the target serving network that the UE is handed over.

SUMMARY OF THE INVENTION

The present application provides a network handover method and apparatus, which can improve the network performance of a target serving network and a target serving cell to which a terminal device is handed over, and ensure the network quality of the UE when moving.

In a first aspect, a method for network switching is provided, including: a first network element determining a plurality of first service networks and a priority corresponding to each of the first service networks; the first network element according to each of the first service networks The priority corresponding to a service network determines the target service network from the plurality of first service networks; the first network element sends first request information to the second network element, and the first request information is used to request to switch the terminal device to A target serving cell, the target serving cell belongs to the target serving network.

In a possible implementation manner, the first network element determines the first service network with the highest priority as the target service network according to the priority corresponding to each first service network, and determines the cell corresponding to the target service network as the target service area.

Optionally, if there is more than one first service network with the highest priority, in other words, if the highest priority corresponds to more than one first service network, one of them can be selected as the target service network, and the target service network corresponding to the The cell is determined as the target serving cell.

Optionally, if the target serving network corresponds to more than one serving cell, the serving cell with the highest signal quality may be determined as the target serving cell.

It should be noted that the above-mentioned multiple first service networks satisfy at least three conditions: the above-mentioned multiple first service networks are service networks that the UE can access (may be referred to as the first condition), and the above-mentioned multiple first service networks satisfy The handover requirement of the UE (ie the first preset condition), the signal quality of the serving cells corresponding to the multiple first serving networks meets the signal level quality required by the handover threshold configuration (ie the second preset condition).

In a possible implementation manner, the manner in which the first network element determines the multiple first service networks and the priority corresponding to each of the first service networks may be that the first network element determines the network selection information of the UE (that is, The first information), the network configuration information of the first network element (that is, the second information), and the measurement reporting information of the UE determine multiple first serving networks and the priority corresponding to each first serving network, wherein the selection of the UE is The network information is used to determine the service networks that the UE can access and the priority information of each accessible service network. The network configuration information of the first network element is used to determine the service network that meets the handover requirements of the UE. The measurement report information is used to determine the serving cell whose signal quality meets the signal level quality required by the handover threshold configuration and the serving network corresponding to the serving cell.

Optionally, the manner in which the first network element obtains the network selection information of the UE (that is, the first information) may be that the first network element requests the mobility management function network element corresponding to the current serving network of the UE or the historical serving network of the UE. The corresponding radio access network element acquires the network selection information of the UE.

According to the network switching method of the embodiment of the present application, the current serving network side of the terminal device (may be referred to as the source serving network) can determine the needs of the terminal device according to the network selection policy information pre-configured by the UE (may also be referred to as the network selection information of the UE). The target serving network and target serving cell to be switched to, in a possible implementation manner, the source serving network may determine multiple first services according to UE measurement report information, network side configuration information and UE preconfigured network selection policy information network, and the priority corresponding to each of the first service networks, and can determine the target service network and the target service cell corresponding to the target service network from the plurality of first service networks according to the priority information. Select or arbitrarily determine the target service network, the network switching method in this application can ensure that a more suitable target service network and a corresponding target service cell with better network performance are selected for the terminal device, ensuring that the UE needs to perform the service network. The network performance during handover with the serving cell also guarantees the continuous operation of terminal equipment services.

With reference to the first aspect, in some implementations of the first aspect, the first network element determining a plurality of first service networks includes: the first network element determining a first service network set, the first service network set including the An accessible service network of the terminal device, and the service network in the first service network set satisfies a first preset condition, and the first preset condition is used to determine whether the service network meets the handover requirement of the terminal device; the first preset condition The network element determines a second serving network set, and the signal quality of the serving cell corresponding to the serving network in the second serving network set satisfies the second preset condition; the first network element determines the first serving network set according to the first serving network set and the second serving network The set determines the plurality of first service networks belonging to the intersection of the first service network set and the second service network set.

According to the network switching method of the embodiment of the present application, the first network element determines a first service network set that satisfies at least two conditions, the at least two conditions include the above-mentioned first condition and the second preset condition, the first network element The first network element determines a second service network set that satisfies at least one condition, the at least one condition includes the above-mentioned first preset condition, and the first network element determines the above-mentioned multiple network elements according to the intersection of the first service network set and the second service network set. the priority information of the multiple first service networks and the multiple first service networks, so that the source service network side of the terminal device can select the target service network from the multiple first service networks according to the priority information, which improves the The network performance of the selected target service network.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the first network element, the first service network set includes: the first network element determining a third service network set according to the first information, the third service network set The set includes accessible service networks of the terminal device, the first information includes network selection policy information preconfigured by the terminal device; the first network element determines a fourth service network set according to the second information, and the fourth service network The centralized service network satisfies a first preset condition, and the first preset condition is used to determine whether the service network satisfies the handover requirement of the terminal device, and the second information includes network configuration information of the first network element; the first network element The element determines the first service network set according to the third service network set and the fourth service network set, and the first service network set belongs to the intersection of the third service network set and the fourth service network set.

According to the network switching method of this embodiment of the present application, the first network element may determine the first service network set in a manner that the first network element determines that the terminal device is accessible according to network selection policy information preconfigured by the terminal device. (that is, satisfying the first condition) third service network set, and the network selection policy information preconfigured by the terminal device can be used to indicate the priority information of the service network that the terminal device can access; the first network element The network configuration information of a network element determines a fourth service network set that satisfies the handover requirement of the terminal device (that is, meets the first preset condition), and the first network element determines according to the third service network set and the fourth service network set The intersection of the first service network set and the priority information of the first service network set is determined, so that the source service network side of the terminal device can determine the priority information of the first service network set and the first service network set according to the first service network set and the priority information of the first service network set. The target service network is selected, and the network performance of the selected target service network is improved.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: the first network element receiving third information, where the third information is used to indicate the first service network set and the first service network Collecting priorities corresponding to each service network; and determining, by the first network element, the first service network set includes: the first network element determining the first service network set according to the third information.

According to the network switching method in this embodiment of the present application, the first network element may also receive third information sent by the second network element, where the third information is used to indicate a service network (ie, a first service network set) that satisfies at least two conditions. and the priority corresponding to the serving network, the at least two conditions include: the serving network is a serving network accessible to the UE, and the serving network satisfies the handover requirement of the UE (ie, the first preset condition).

It should be noted that the third information may be the process of the terminal equipment in the historical switching between the serving network and the serving cell, the corresponding source serving network side or the target serving network side in each handover process according to its own network configuration information and obtained. The first information is determined.

In another possible implementation manner, the manner in which the first network element determines the plurality of first service networks and the priority corresponding to each of the first service networks may be that the first network element determines the first network element according to the third information and the UE The measurement and reporting information of the UE determines multiple first serving networks and the priority corresponding to each first serving network, wherein the third information is used to determine the serving network accessible to the UE and meeting the handover requirement of the UE, and each The priority information of the serving network and the measurement report information of the UE are used to determine the serving cell whose signal quality meets the signal level quality required by the handover threshold configuration and the serving network corresponding to the serving cell. The first network element determines the target serving network and the target serving cell according to the third information and the measurement report information of the UE, which can improve the success rate and handover efficiency of the terminal device switching the serving network and the serving cell, and avoid resource waste caused by handover failure.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: the first network element receiving first response information for the first request information, where the first response information is used to indicate the terminal device Whether the handover to the target serving cell is successful, the first response information includes the third information.

According to the network handover method of the embodiment of the present application, the third information can be carried in the response information sent by the second network element for the last handover request, which can save signaling and communication resources.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: the first network element acquiring first information from a third network element, where the first information is used to indicate that the terminal device is accessible The priority corresponding to each service network in the plurality of service networks, the plurality of service networks includes the plurality of first service networks; and the first network element determines the priority corresponding to each of the first service networks includes: the The first network element determines the priority corresponding to each of the first service networks according to the first information.

It should be noted that the third network element includes a mobility management function network element corresponding to the current service network of the terminal device, or the third network element includes a wireless access network element corresponding to the historical service network of the terminal device.

In a possible implementation manner, the first network element obtains the first information from a mobility management function network element corresponding to the current serving network (ie, the source serving network) of the terminal device, and further, the first network element obtains the first information from The manner in which the mobility management function network element corresponding to the current serving network of the terminal device obtains the first information may be that the first network element obtains the network selection information of the UE through the initial UE context establishment process, that is, the mobility management of the core network of the source serving network. The network element sends the network selection information of the UE to the first network element, and the network selection information of the UE is carried in the initial context establishment request sent by the mobility management network element of the core network of the source serving network to the first network element; or the first network element The UE's network selection information is obtained through the UE context modification process, that is, the mobility management network element of the source service network core network sends the UE's network selection information to the first network element, and the UE's network selection information is carried in the mobile network of the source service network core network. In the UE context modification request sent by the management network element to the first network element.

As an example and not a limitation, when the third network element is a mobility management function network element corresponding to the source serving network, the third network element may obtain the first information in a manner that the third network element may follow the standard registration process of the UE. The first information is obtained from the UDM. Specifically, the manner in which the third network element obtains the first information from the UDM according to the standard registration process of the UE may be: the third network element registers with the UDM, and subscribes to notify the third network element when the third network element deregisters in the UDM. A notification from the network element; the third network element sends a user subscription information acquisition request/response to the UDM to acquire the subscription information of the UE; the subscription information includes the first information; optionally, after the third network element acquires the first information, The first information may be stored, for example, the first information may be stored in the UE context as part of the UE subscription information.

In a possible implementation manner, the first network element obtains the first information from the wireless access network network element corresponding to the historical service network of the terminal device, which can be understood as switching between the service network and the service network of the terminal device. During the historical handover process of the cell, the radio access network element corresponding to the historical service network obtains the first information in the corresponding handover process, and the radio access network element corresponding to the historical service network can perform the communication with the first network element. Therefore, the first network element can obtain the first information from the wireless access network network element corresponding to the historical service network of the terminal device.

With reference to the first aspect, in some implementations of the first aspect, before the first network element determines a plurality of first service networks, the method further includes: the first network element receives fourth information, the fourth information Used to indicate a fifth service network set, where the fifth service network set includes accessible service networks of the terminal device, and the signal quality of the serving cell corresponding to the service network in the fifth service network set satisfies the second preset condition ; and the first network element determining a plurality of first service networks includes: the first network element determining the fifth service network set according to the fourth information; the first network element determining the sixth service network set according to the second information, The service network in the sixth service network set satisfies a first preset condition, where the first preset condition is used to determine whether the service network satisfies the handover requirement of the terminal device, and the second information includes network configuration information of the first network element ; the first network element determines the plurality of first service networks according to the fifth service network set and the sixth service network set, and the plurality of first service networks belong to the fifth service network set and the sixth service network set intersection.

According to the network switching method in this embodiment of the present application, the first network element may also receive fourth information sent by the UE, where the fourth information is used to indicate a serving network that satisfies at least two conditions (that is, a fifth serving network set) and the service network Priority corresponding to the network: the serving network is a serving network accessible to the UE, and the serving cell corresponding to the serving network satisfies the signal level quality required by the handover threshold configuration (ie, the second preset condition).

Optionally, the first network element may receive the fourth information when the first information cannot be obtained, or in other words, the target serving network and the target serving cell cannot be determined through the first information, and determine the target service according to the fourth information. network and target serving cell.

Optionally, the fourth information may be carried in measurement reporting information of the UE.

In another possible implementation manner, the manner in which the first network element determines the plurality of first service networks and the priority corresponding to each of the first service networks may be that the first network element determines according to the fourth information and the first The network configuration information of a network element determines a plurality of first serving networks and the priority corresponding to each first serving network, wherein the fourth information is used to determine that the UE can access and the corresponding serving cell satisfies the requirements of the handover threshold configuration. Serving networks with required signal level quality, and priority information of each serving network, and the network configuration information of the first network element is used to determine the serving network that meets the handover requirement of the UE.

With reference to the first aspect, in some implementations of the first aspect, before the first network element determines a plurality of first service networks, the method further includes: the first network element receives measurement report information of the terminal device, The fourth information is included in the measurement report information.

According to the network switching method of the embodiment of the present application, the fourth information can be carried in the measurement reporting information of the terminal device, which can save signaling and communication resources.

With reference to the first aspect, in some implementations of the first aspect, the fourth information is further used to indicate the priority corresponding to each service network in the multiple service networks accessible to the terminal device, the multiple service networks The network includes the plurality of first service networks, and determining, by the first network element, a priority corresponding to each of the first service networks includes: the first network element determining, according to the fourth information, a priority corresponding to each of the first service networks priority.

It should be noted that the above-mentioned first preset condition includes that the serving network is reachable in the current time period and/or the network quality of the serving network satisfies the third preset condition.

Optionally, the above-mentioned third preset condition may refer to a preset reference signal received power (reference signal received power, RSRP), or a preset received reference signal level value (for example, it may be -100dbm), if the service If the network quality of the network satisfies the third preset condition, it may be considered that the received reference signal level value measured by the serving cell corresponding to the serving network is greater than or equal to the preset received reference signal level value.

With reference to the first aspect, in some implementations of the first aspect, the first request information is further used to indicate a third service network set, where the third service network set includes accessible service networks of the terminal device.

According to the network switching method of this embodiment of the present application, the first request information sent by the first network element to the second network element may also be used to indicate an accessible service network of the terminal device. By way of example and not limitation, the first request information The request information may include the above-mentioned first information. After obtaining the first information, the second network element can determine, according to its own network configuration information, that the terminal device's accessible service network satisfies the terminal device handover requirement in the current time period. (For example, the service network is reachable in the current time period and/or the network quality of the service network meets the third preset condition) service network (ie, the first service network set), or in other words, determine the service network that the terminal device can access The service network that can be switched to in the current time period, and the first service network set is sent to the first network element. The target serving network is determined, so as to improve the efficiency and success rate of the terminal device switching between the serving network and the serving cell.

It should be noted that the above-mentioned second network element includes a mobility management function network element corresponding to the current serving network of the terminal device, or the second network element includes a wireless access network network element corresponding to the target serving network.

In a possible implementation manner, when the first network element cannot directly communicate with the wireless access network element corresponding to the target service network, the first network element can communicate with the network element of the mobility management function corresponding to the current service network of the terminal device. Communication with the wireless access network element corresponding to the target service network can be understood as that the first network element communicates with the wireless access network element corresponding to the target service network through the mobility management function network element corresponding to the current service network of the terminal device. Initiate a handover request.

In another possible implementation manner, the first network element may directly communicate with the wireless access network network element corresponding to the target service network. It can be understood that the first network element does not need to pass through the current service network of the terminal device. The corresponding mobility management function network element may directly initiate a handover request to the wireless access network network element corresponding to the target service network.

In a second aspect, a method for network switching is provided, including: a fourth network element determining a first service network set, where the first service network set includes accessible service networks of a terminal device, and the first service network set The service network meets the first preset condition, and the first preset condition is used to determine whether the service network meets the handover requirement of the terminal device. The fourth network element sends third information, where the third information is used to indicate the first serving network set.

According to the network switching method of the embodiment of the present application, the fourth network element determines a service network (ie, a first service network set) that the terminal device can access and that meets the switching requirements of the terminal device, and sends the first network element to the first network element. The first serving network set, or in other words, sending third information for indicating the first serving network set to the first network element, so that the first network element can determine according to the third information and its own network configuration information It should be understood that after acquiring the third information, the first network element can determine the target service network from the plurality of first service networks according to the priority information And the target serving cell corresponding to the target service network, compared with the optional or arbitrarily determined target service network, the network switching method in the present application can ensure that a target with better network performance that is more suitable for the terminal device is selected The serving network and the corresponding target serving cell ensure the network performance when the UE needs to perform the handover between the serving network and the serving cell, and also ensure the continuous operation of the terminal equipment service.

It should be noted that the first preset condition includes that the serving network is reachable in the current time period and/or the network quality of the serving network satisfies the third preset condition.

With reference to the second aspect, in some implementations of the second aspect, before the fourth network element determines the first service network set, the method further includes: the fourth network element receives fifth information, where the fifth information is used indicating the accessible service network of the terminal device; and the fourth network element determining the first service network set includes: the fourth network element determining the first service network according to the fifth information and the first preset condition set.

According to the network switching method in this embodiment of the present application, the fourth network element may receive fifth information, where the fifth information is used to indicate an accessible service network of the terminal device, and the fourth network element may receive the fifth information according to the fifth information. Determine the first service network set. In a possible implementation manner, the fourth network element may determine the service network that the terminal device can access according to the fifth information, and then determine according to the network configuration information of the fourth network element A service network (ie, a first service network set) that can be accessed by the terminal device that satisfies the first preset condition is obtained.

With reference to the second aspect, in some implementations of the second aspect, before the fourth network element determines the first service network set, the method further includes: the fourth network element receives first request information, the first request The information is used to request that the terminal device be handed over to the target serving cell, and the first request information includes fifth information, where the fifth information is used to indicate an accessible serving network of the terminal device.

According to the network switching method of the embodiment of the present application, the above fifth information can be carried in the first request information sent by the first network element, which can save signaling and communication resources.

It should be noted that the fourth network element includes a mobility management function network element corresponding to the current service network of the terminal device, or the fourth network element includes a mobility management function network element corresponding to the target service network, or the fourth network element includes a mobility management function network element corresponding to the target service network. The element includes a radio access network element corresponding to the target service network.

In a third aspect, an apparatus for network switching is provided, and the apparatus can be used to perform the operations of the communication device in the first aspect and any possible implementation manner of the first aspect. Specifically, the communication apparatus includes means for performing the steps or functions described in the first aspect. The corresponding means may be the first communication device of the first aspect. The steps or functions can be implemented by software, or by hardware, or by a combination of hardware and software.

For the beneficial effects of the encoding apparatus provided in the third aspect, reference is made to the beneficial effects of the first aspect and various possible implementations thereof, and details are not described herein again.

In a fourth aspect, an apparatus for network switching is provided, and the apparatus can be used to perform the operation of the communication device in the second aspect and any possible implementation manner of the second aspect. Specifically, the apparatus may include means for performing the steps or functions described in the second aspect above. The steps or functions can be implemented by software, or by hardware, or by a combination of hardware and software.

For the beneficial effects of the encoding apparatus provided in the fourth aspect, reference is made to the beneficial effects of the second aspect and various possible implementations thereof, and details are not repeated here.

In a fifth aspect, a computer-readable medium is provided, the computer-readable medium stores a computer program (which may also be referred to as code, or an instruction), when it is run on a computer, so that the above-mentioned first aspect and any one thereof The methods in the possible implementations are performed; or the methods in the above-mentioned second aspect and any possible implementations thereof are performed.

In a sixth aspect, a chip system is provided, including a memory and a processor, the memory is used for storing a computer program, and the processor is used for calling and running the computer program from the memory, so that the communication device installed with the chip system executes the above-mentioned The method in the first aspect and any possible implementation manner thereof; or the method in the above-mentioned second aspect and any possible implementation manner thereof.

In a seventh aspect, a chip is provided, the chip includes a processor and a communication interface, the communication interface is used to communicate with an external device or an internal device, and the processor is used to implement the above-mentioned first aspect and any possible implementation manner thereof or the processor is used to implement the method in the second aspect and any possible implementation manners thereof.

In a possible implementation manner, the chip may further include a memory in which instructions are stored, and the processor is configured to execute the instructions stored in the memory or derived from other instructions. When the instruction is executed, the processor is used to implement the method in the above-mentioned first aspect and any possible implementation manner thereof; or the processor is used for implementing the method in the above-mentioned second aspect and any possible implementation manner thereof.

In an eighth aspect, a computer program product is provided, the computer program product comprising: a computer program (also referred to as code, or instructions), which, when the computer program is run, causes the computer to execute the first aspect and any one of the above a method in one possible implementation manner; or perform the method in the second aspect and any one of the possible implementation manners.

In a ninth aspect, a communication device is provided, including a processor and a memory, where the memory is used for storing a computer program, and the processor is used for calling and running the computer program from the memory, so that the communication device executes the first secret aspect and the communication method in any possible implementation manner thereof, or perform the second aspect and the communication method in any possible implementation manner thereof.

The processor is one or more and the memory is one or more. The memory may be integrated with the processor, or the memory may be provided separately from the processor.

In one possible design, a communication device is provided that includes a communication interface, a processor and a memory. The processor is used to control the communication interface to send and receive signals, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device executes the first aspect and any possible implementation manners thereof method, or perform the method in the second aspect and any of its possible implementation manners.

In a tenth aspect, a system is provided, the system comprising the network switching apparatus of the third aspect and the network switching apparatus of the fourth aspect.

Description of drawings

FIG. 1 is a schematic diagram of a system scenario to which an embodiment of the present application is applicable.

FIG. 2 is a schematic flowchart of a network switching method provided by an embodiment of the present application.

FIG. 3 is a schematic flowchart of a network switching method provided by another embodiment of the present application.

FIG. 4 is a schematic flowchart of a network switching method provided by another embodiment of the present application.

FIG. 5 is a schematic flowchart of a network switching method provided by another embodiment of the present application.

FIG. 6 is a schematic block diagram of a network switching apparatus provided by an embodiment of the present application.

FIG. 7 is a schematic structural diagram of a network switching device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The technical solutions of the embodiments of the present application may be applied to various communication systems, for example: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division duplex) , TDD), universal mobile telecommunication system (UMTS), fifth generation (5th generation, 5G) system, future fifth generation (5.5th generation, 5.5G), sixth generation (6th generation) , 6G) or new wireless (new radio, NR) and so on.

In the following, the source service network and the target service network are both fifth-generation system networks as an example, and the network architecture of the source service network or the target service network in the present application will be described with reference to FIG. 1 .

The 5G mobile communication system architecture is mainly composed of terminal equipment, radio access network, core network and data network. Among them, terminal equipment, radio access network and core network are the main components of the architecture. Logically, they can be divided into user plane and The control plane consists of two parts, the control plane is responsible for the management of the mobile network, and the user plane is responsible for the transmission of service data.

As shown in Figure 1, the communication system includes but is not limited to the following network elements:

1. Terminal equipment

The terminal equipment in the embodiments of the present application may also be referred to as: user equipment (user equipment, UE), mobile station (mobile station, MS), mobile terminal (mobile terminal, MT), access terminal, subscriber unit, subscriber station, Mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user equipment, etc.

The terminal device is the entrance for the mobile user to interact with the network, and has certain computing and storage capabilities. The terminal device can display a service window to the user and accept user operation input. Exemplarily, a terminal device in 5G will use a new air interface technology to establish a signal connection and a data connection with the wireless access network, so as to transmit control signals and service data to the mobile network.

The terminal device may be a device that provides voice/data connectivity to the user, such as a handheld device with a wireless connection function, a vehicle-mounted device, and the like. At present, some examples of terminals are: mobile phone (mobile phone), tablet computer, notebook computer, PDA, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented Augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving or autopilot, wireless terminals in remote medical surgery, smart grid ( Wireless terminal in smart grid), wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, cellular phone, cordless phone, session initiation protocol Session initiation protocol (SIP) telephones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices, or other devices connected to wireless modems Processing equipment, vehicle-mounted equipment, wearable equipment, terminal equipment in the future 5G network or terminal equipment in the future evolved public land mobile network (public land mobile network, PLMN), etc., are not limited in this embodiment of the present application.

As an example and not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices, which are the general term for the intelligent design of daily wear and the development of wearable devices using wearable technology, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets, smart jewelry, etc. for physical sign monitoring. In addition, in this embodiment of the present application, the terminal device may also be a terminal device in an internet of things (internet of things, IoT) system. In addition, in this embodiment of the present application, the terminal device may also communicate with terminal devices of other communication systems, for example, inter-device communication.

2. Radio access network (RAN)

A wireless access network is an access network that realizes the function of an access network based on a wireless communication technology. It is usually deployed near the terminal equipment to provide network access functions for authorized users in a specific area, and can determine different quality transmission tunnels to transmit user data according to the user's level and service requirements. The wireless access network can manage the wireless resources, reasonably utilize the self-radio resources to provide wireless access or air interface access services for the terminal on demand, and then complete the forwarding of control signals and user data between the terminal and the core network.

As an example and not a limitation, the radio access network may be an evolved NodeB (evolved NodeB, eNB or eNodeB) in the LTE system, or may be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario , or the access device can be a relay station, an access point, a vehicle-mounted device, a wearable device, an access device in a 5G network or an access device in a future evolved PLMN network, etc., and can be an access point in a WLAN ( access point, AP), which may be a gNB in the NR system, which is not limited in this embodiment of the present application.

3. Data network (DN)

The data network is used to provide users with business services. Generally, the client is located in the UE, and the server is located in the data network. The data network can be a private network, such as a local area network, or an external network that is not controlled by operators, such as the Internet, or a private network jointly deployed by operators, such as providing IP multimedia subsystem (IMS) services network of.

The core network of the 5G network architecture is responsible for maintaining the subscription data of the mobile network, managing the network elements of the mobile network, and providing functions such as session management, mobility management, policy management, and security authentication for the UE. For example, when the UE is attached, it provides network access authentication for the UE; when the UE has a service request, it allocates network resources for the UE; when the UE moves, it updates the network resources for the UE; when the UE is idle, it provides fast recovery for the UE mechanism; when the UE is detached, it releases network resources for the UE; when the UE has service data, it provides data routing functions for the UE, such as forwarding uplink data to the data network; or receives UE downlink data from the data network and forwards it to the wireless access point. Access the network and send it to the UE.

As shown in Figure 1, the core network of the 5G network architecture is further refined. The user plane network elements of the core network include user plane function network elements (UPF); the control plane network elements of the core network include the authentication server function. Network element (authentication server function, AUSF), core network access and mobility management function network element (core access and mobility management function, AMF), session management function network element (session management function, SMF), network slice selection function network element (network slice selection function, NSSF), network exposure function (network exposure function, NEF), network storage function (network repository function, NRF), unified data management network element (unified data management, UDM), policy Control function network element (policy control function, PCF), application function network element (application function, AF).

The core network control plane adopts a service-oriented architecture, and the interaction between the network elements of the control plane adopts the method of service invocation to replace the point-to-point communication method in the traditional architecture. In the service-based architecture, the control plane network elements will open services to other control plane network elements for other control plane network elements to call; in point-to-point communication, there will be a set of specific messages on the communication interface between the control plane network elements, which can only be used by other control plane network elements. The control plane NEs at both ends of the interface are used for communication.

The functions of each network element in the core network of the 5G network architecture are further introduced below:

4. Access and mobility management function network element (access and mobility management function, AMF)

The access and mobility management function network elements are mainly used for access management and mobility management, etc., and are responsible for the state maintenance of the UE, the reachability management of the UE, the non-mobility management (MM), and the non-access stratum (non-access stratum). -access-stratum, NAS) message forwarding, session management (session management, SM) N2 message forwarding (provides transport for SM messages between UE and SMF). It can be used to implement functions other than session management in the mobility management entity (mobility management entity, MME) function, for example, functions such as legal interception, or access authorization (or authentication). In the embodiments of the present application, the functions of the access and mobility management network elements can be implemented.

5. Unified data management network element (unified data management, UDM)

The unified data management network element belongs to the core network control plane network element and belongs to the user server. It can be used for unified data management and supports functions such as 3GPP authentication, user identity operation, authority granting, registration and mobility management. In this embodiment of the present application, it can be used to implement the function of managing user subscription contexts.

6. Session management function network element (session management function, SMF)

The session management function network element is mainly used for session management, Internet Protocol (IP) address allocation and management of terminal equipment, selection of manageable user plane function (UPF) network elements, policy control and charging functions The endpoint of the interface and the downlink data notification, etc. In the embodiment of the present application, it can be used to realize the function of the session management network element, allocate resources for the session of the UE, and release the resources; wherein the resources include session quality of service (quality of service, QoS), session paths, and forwarding rules.

7. Policy control function (PCF)

The policy control network element is used to guide the unified policy framework of network behavior, and provides policy rule information and the like for control plane functional network elements (eg, AMF, SMF network elements, etc.).

8. User plane function (UPF)

The user plane functional network element can be used to perform user data packet forwarding or QoS parameter processing of user plane data according to the routing rules of the SMF. User data can be accessed to a data network (DN) through this network element. For example, the user plane function network element sends the uplink data to the DN or other UPFs according to the routing rules of the SMF, or forwards the downlink data to other UPFs or RANs. In this embodiment of the present application, it can be used to implement the function of the user plane network element.

9. Network storage function network element (network repository function, NRF)

The network storage function network element can be used to support network element services or network element discovery functions, receive NF discovery requests from network function (network function, NF) instances, and provide information about the discovered NF instances to the NF instances. and NF configuration files to support maintaining available NF instances and the services they support. In other words, the network storage function network element can be used to provide other network elements with a storage function and a selection function of network function entity information.

20. Network exposure function (NEF)

The network capability opening function network element is used to open the service and network capability information (such as terminal location, session reachability) and the like provided by the 3GPP network function to the outside.

11. Application function network element (application function, AF)

The application function network element is used to interact with the core network to provide services, and to affect service flow routing, access network capability opening, and policy control.

12. Authentication server function network element (authentication server function, AUSF)

The authentication server function network element is mainly used for user authentication and authorization to ensure that the user is a legitimate user.

13. Network slice selection function Network element (network slice selection function, NSSF)

The network slice selection function network element is used to determine the network slice instance that the UE is allowed to access according to the slice selection auxiliary information and subscription information of the UE.

In the above network architecture, the N2 interface is the interface between the RAN and the AMF network element, which is used for sending radio parameters, non-access stratum (NAS) signaling, etc.; the N3 interface is the interface between the RAN and the UPF network element. The N4 interface is the interface between the SMF network element and the UPF network element, which is used to transmit service policies, tunnel identification information of N3 connection, data buffer indication information, and downlink data notification. messages, etc. The N6 interface is the interface between the DN network element and the UPF network element, which is used to transmit user plane data, etc. Nudm is the service interface provided by UDM, and Namf is the service interface provided by AMF.

It should be understood that the above-mentioned network architecture applied to the embodiments of the present application is only a network architecture described from the perspective of a traditional point-to-point architecture and a service-oriented architecture, and the network architecture applicable to the embodiments of the present application is not limited thereto. Any network architecture capable of implementing the functions of the foregoing network elements is applicable to the embodiments of the present application.

It should be understood that the names of the various network elements of the 5G system in FIG. 1 are only examples and not limitations. In other network types, network elements with the same or similar functions may have other names. The name of the interface is also just an example, and the name of the interface in the specific implementation may be other names, which are not specifically limited in this application. In addition, the names of the messages (or signaling) transmitted between the above network elements are only an example, and do not constitute any limitation on the functions of the messages themselves.

It should be noted that the above-mentioned network elements may also be referred to as entities, devices, devices, or modules, etc., which are not particularly limited in this application. In addition, in this application, in order to facilitate understanding and description, the description of the network element is omitted in some descriptions. For example, the AMF network element is abbreviated as AMF. In this case, the "AMF" should be understood as the AMF network element. The following , omitting the description of the same or similar situations.

It can be understood that the above-mentioned functional network elements may be network elements in hardware devices, software functions running on dedicated hardware, or virtualized functions instantiated on a platform (eg, a cloud platform).

It can be understood that, in the communication system shown in FIG. 1 , the functions of each component network element are only exemplary, and not all functions of each component network element are required when applied to the embodiments of the present application.

It should also be noted that the above network architecture is illustrated by taking the source service network and the target service network as 5G networks as an example, wherein the 5G network can be a public network or a non-public network; in fact, the source service network and The target service network can also be other types of networks, such as the fourth generation mobile communication network, the future fifth and fifth generation mobile communication network, or the sixth generation mobile communication network, etc., the network type of the source service network and the target service network It may be the same or different, and it should be understood that the network architecture applicable to the embodiments of this application is not limited to this.

It should be understood that a network can be divided into a public network and a non-public network, wherein a public network is a public network, such as a public land mobile network (PLMN), a non-public network (NPN) It is a non-public network. There are two types of non-public networks: the first is an independently deployed NPN network (standalone NPN, SNPN), which can be implemented independently of the network functions of PLMN and is implemented by the operator of SNPN. operation. The second is the public network integrated NPN (PNI-NPN) network, which relies on the network functions of the PLMN and is operated by traditional operators.

Connection management (CM) is used to establish and release the control plane signaling connection between the UE and the AMF. The NAS signaling connection is used for NAS signaling interaction between the UE and the core network. The NAS signaling connection includes the signaling connection between the UE and the RAN and the N2 connection between the RAN and the AMF. There are two states of signaling connection between UE and AMF in 5G system: CM-IDLE state and CM-CONNECTED state.

Before the UE joins the network, the NAS signaling connection between the UE and the AMF has not been established. At this time, the UE is in the CM-IDLE state. The UE selects an available serving network and an available cell according to the network and cell information broadcast by the RAN for network access. Afterwards, a NAS signaling connection is established between the UE and the AMF, and the UE transitions from the CM-IDLE state to the CM-CONNECTED state.

When the UE in the CM-CONNECTED state moves to a new area after joining the network, the network quality of the serving network (can be called the source serving network) and the serving cell (can be called the source serving cell) accessed by the UE in the previous area changes with The movement of the UE may not meet the network requirements of the UE in the current area, because the same geographical area may be within the coverage of multiple serving networks, or the current area where the UE is located may belong to different serving cells. They belong to different serving networks. Therefore, after the UE in the CM-CONNECTED state moves to a new area, a serving network (can be called a target serving network) and a serving cell (can be called a target serving cell) can be re-determined for handover to ensure the network quality of the UE.

At this time, the RAN (which can be referred to as S-RAN) in the source serving network will be based on the network configuration information corresponding to the S-RAN side and the UE's measurement and reporting information on the wireless signal quality of multiple cells (which may be referred to as UE's measurement reporting). information) to determine the set of reachable serving cells that meet the signal level quality requirements and the serving network corresponding to each serving cell, the serving cell set includes at least one serving cell, and one of the serving cells is selected as the target serving cell. The serving network corresponding to the serving cell is used as the target serving network. The UE switches from the source serving network to the target serving network and from the source serving cell to the target serving cell, but is arbitrarily determined from multiple reachable serving cells that meet the signal level quality requirements. The target serving cell and the target serving network corresponding to the target serving cell cannot make the UE switch to the optimal serving network and the optimal serving cell, the network quality of the UE cannot be guaranteed, and the network effect may be poor.

It should be noted that the above-mentioned signal level quality requirement may refer to the signal level quality required by the switching threshold configuration.

In view of the above problems, the present application proposes a method for network handover, which can improve the network performance of the target serving network and the target serving cell, and ensure the network quality of the UE when moving. In the method for network handover proposed in this application, the source serving network can determine the target serving network and the target serving cell according to the network selection policy information preconfigured by the UE (also referred to as the UE's network selection information), specifically, the source serving network The network can determine the priority information of the reachable serving network corresponding to the above-mentioned multiple serving cells that meet the signal level quality requirements according to the measurement report information of the UE, the configuration information on the network side, and the network selection policy information preconfigured by the UE, The higher serving network is determined as the target serving network, the serving cell corresponding to the target serving network is taken as the target serving cell, and the UE is handed over from the source serving network to the target serving network and from the source serving cell to the target serving cell.

It should be noted that the network selection information of the UE (an example of the first information) is used to indicate the set of service networks that the UE can access and the priority information corresponding to each service network in the set of service networks, and the measurement report information of the UE above Used to determine the serving cell that satisfies the preset signal level quality value, the above-mentioned network side configuration information (an example of the second information) is used to determine the serving network that satisfies the UE handover requirement, where the UE handover requirement can be that the serving network can be used in the current time period. The network quality of the reaching and/or serving network satisfies the first preset condition.

Next, the network switching method 200 of the present application will be described in detail with reference to FIG. 2 , taking as an example that both the source service network and the target service network are fifth-generation system networks.

S201, the first network element determines a plurality of first service networks and a priority corresponding to each first service network.

It should be noted that the above-mentioned multiple first service networks satisfy at least three conditions: the above-mentioned multiple first service networks are service networks accessible to the UE, and the above-mentioned multiple first service networks meet the handover requirements of the UE (that is, the first service network preset condition), the signal quality of the serving cells corresponding to the plurality of first serving networks satisfies the signal level quality required by the handover threshold configuration (ie, the second preset condition).

In a possible implementation manner, the first network element determines the plurality of first network elements according to the network selection information of the UE (that is, the first information), the network configuration information of the first network element (that is, the second information), and the measurement report information of the UE. A serving network and the priority corresponding to each first serving network, wherein the network selection information of the UE is used to determine the serving network that the UE can access and the priority information of each accessible serving network, the first serving network The network configuration information of the network element is used to determine the serving network that meets the handover requirement of the UE, and the measurement report information of the UE is used to determine the serving cell whose signal quality meets the signal level quality required by the handover threshold configuration and the service corresponding to the serving cell. network.

Optionally, the first network element may also receive third information sent by the second network element, where the third information is used to indicate a service network that satisfies at least two conditions (that is, the first service network set) and the corresponding service network. Priority, the at least two conditions include: the serving network is a serving network accessible to the UE, and the serving network satisfies the handover requirement of the UE (ie, the first preset condition).

Optionally, the third information may be carried in response information sent by the second network element for the last handover request.

In another possible implementation manner, the first network element determines a plurality of first serving networks and a priority corresponding to each first serving network according to the third information and the measurement report information of the UE, wherein the third information Used to determine the serving networks accessible to the UE and meeting the handover requirements of the UE, and the priority information of each serving network, and the measurement report information of the UE is used to determine the signal quality that meets the signal level required by the handover threshold configuration The quality of the serving cell and the serving network corresponding to the serving cell.

Optionally, the first network element may also receive fourth information sent by the UE, where the fourth information is used to indicate a serving network that satisfies at least two conditions (that is, a fifth serving network set) and a priority corresponding to the serving network: The serving network is a serving network accessible to the UE, and the serving cell corresponding to the serving network satisfies the signal level quality required by the handover threshold configuration (ie, the second preset condition).

In another possible implementation manner, the first network element determines a plurality of first service networks and a priority corresponding to each first service network according to the foregoing fourth information and the network configuration information of the first network element, wherein the The fourth information is used to determine a serving network accessible to the UE and whose corresponding serving cell satisfies the signal level and quality required by the handover threshold configuration, and the priority information of each serving network, and the network configuration of the first network element. The information is used to determine the serving network that satisfies the UE's handover requirements.

It should also be noted that the above-mentioned handover requirement of the UE includes that the serving network is reachable in the current time period and/or the network quality of the serving network satisfies the third preset condition.

S202, the first network element determines a target service network from a plurality of first service networks according to the priority corresponding to each first service network.

S203: The first network element sends first request information to the second network element, where the first request information is used to request handover of the terminal device to a target serving cell, where the target serving cell belongs to the target serving network.

Optionally, after step S203, the first network element may further receive first response information to the first request information, where the first response information is used to indicate whether the terminal device is successfully handed over to the target serving cell.

Optionally, the above-mentioned first response information may include the above-mentioned third information. If the UE fails to successfully switch to the target serving cell and the target serving network this time, the third information can be used to determine the next target serving cell and target service. network.

Optionally, the network selection information of the UE (that is, the first information) can be carried in the first request information, and the network selection information of the UE can be used by the second network element according to the network selection information of the UE and the network of the second network element. The configuration information determines the above-mentioned third information.

It should be noted that, taking the fifth-generation system network as an example, the first network element includes the RAN corresponding to the current serving network of the UE, the second network element includes the AMF corresponding to the current serving network of the terminal device, or the second network element includes all The above-mentioned RAN corresponding to the target service network, the above-mentioned third network element includes the AMF corresponding to the current service network of the terminal device or the RAN corresponding to the historical service network of the terminal device. It should be understood that the present application is not limited to this, and the above-mentioned network element may also be Network elements with similar or identical functions in other communication systems.

It should be understood that the network configuration information of different network elements is not necessarily the same. Therefore, for the same service network, the result of whether the service network is determined by the first network element according to the network configuration information of the first network element for the UE's handover request may be different from the result of the first network element. The second network element determines whether the serving network has a different handover request based on the network configuration information of the second network element. For example, the first network element determines the current time period of the serving network according to the network configuration information of the corresponding first network element. The handover requirement of the UE is met, which can be represented by the fact that the serving network is reachable in the current time period and/or the network quality of the serving network satisfies the third preset condition, and the second network element is based on the network configuration information of the corresponding second network element. It is judged that the current time period of the serving network does not meet the handover requirement of the UE.

Next, the network switching method 300 of the present application will be described in detail with reference to FIG. 3 , taking as an example that both the source service network and the target service network are fifth-generation system networks. Among them, network element #A and network element #B belong to the source service network, and network element #C and network element #D belong to the target service network.

In this embodiment, network element #A obtains information #A and information #B, and determines a target serving cell and a target serving network according to information #A, information #B and network configuration information #A corresponding to network element #A.

S301, the network element #A obtains information #A, where the information #A is used to indicate the service network set #A accessible to the UE and the priority corresponding to each service network in the service network set #A.

In a possible implementation manner, network element #A acquires the information #A from network element #B. Wherein, as an example and not a limitation, the way that network element #B obtains the information #A may be, if network element #B is a mobility management network element (such as an AMF network element or a mobility management node function) on the core network side of the source serving network (mobility management entity, MME) network element), the network element #B can obtain the information #A from the UDM according to the standard registration process of the UE.

Specifically, the way that the network element #B obtains the information #A from the UDM according to the standard registration process of the UE may be: the network element #B registers with the UDM, and subscribes to notify the network element when the network element #B deregisters in the UDM. Notification of #B; network element #B sends a user subscription information acquisition request/response (Nudm_SDM_Get Request/Response) to UDM to obtain the subscription information of the UE; the subscription information includes the information #A; optionally, network element #B After the information #A is acquired, the information #A may be stored, for example, the information #A is stored in the UE context as a part of the UE subscription information.

It should be understood that the subscription information of the UE may include the information #A, and the subscription information of the UE is stored in the UDM network element.

In a possible implementation manner, the above-mentioned information #A is the network selection policy information preconfigured by the UE (also referred to as the network selection information of the UE). As an example and not a limitation, the UE network selection information may include, but is not limited to, the following: a list of independently deployed non-public networks (SNPN) controlled by the UE, and network priorities corresponding to each network therein; and/ or a list of independently deployed non-public networks controlled by a network, and a network priority corresponding to each network therein; and/or a list of network groups controlled by a network, and a priority corresponding to each network group therein.

In a possible implementation manner, network element #A is the RAN (referred to as S-RAN) corresponding to the source serving network, and the network element #A can obtain the UE's selection from the mobility management network element of the core network of the source serving network. web information.

As an example and not a limitation, the process for network element #A to obtain the UE's network selection information from the mobility management network element of the source serving network core network may be: network element #A obtains the UE's network selection information through the initial UE context establishment process, that is, The mobility management network element of the core network of the source service network sends the network selection information of the UE to the network element #A, and the network selection information of the UE is carried in the initial context establishment sent by the mobility management network element of the core network of the source service network to the network element #A request (INITIAL CONTEXT SETUP REQUEST); or network element #A obtains the UE's network selection information through the UE context modification process, that is, the mobility management network element of the source service network core network sends the UE's network selection information to network element #A, the The network selection information of the UE is carried in the UE context modification request (UE CONTEXT MODIFICATION REQUEST) sent by the mobility management network element of the core network of the source serving network to the network element #A.

Optionally, after acquiring the information #A, the network element #A stores the information #A.

S302, the network element #A obtains information #B, where the information #B is used to determine the serving cell set #B, the serving network corresponding to each serving cell in the serving cell set #B, and each serving cell in the serving cell set #B A radio signal level value corresponding to a serving cell, wherein the radio signal level value of each serving cell in the serving cell set #B satisfies the second preset condition.

In a possible implementation manner, the network element #A acquires the mobility measurement report information of the UE, and the mobility measurement report information of the UE includes the information #B.

It should be noted that the serving network set #B includes a serving network corresponding to each serving cell in the serving cell set #B.

S303, the network element #A determines the target serving network and the target serving cell corresponding to the target serving network according to the information #A, the information #B and the network configuration information #A corresponding to the network element #A.

It should be noted that the network configuration information #A is used to indicate a serving network that satisfies the condition #A (ie, the first preset condition), and the condition #A is used to determine whether the serving network satisfies the handover requirement of the terminal device. As an example and not a limitation, the condition #A includes, but is not limited to, the serving network is reachable in the current time period and/or the network quality of the serving network satisfies the third preset condition.

In a possible implementation manner, the network element #A determines the target serving network and the target serving cell corresponding to the target serving network according to the information #A, the information #B and the network configuration information #A corresponding to the network element #A The process can be:

The network element #A determines the service network set #A that the terminal device can access according to the information #A;

The network element #A determines the serving network set #B according to the information #B, and the signal quality of the serving cell corresponding to each serving network in the serving network set #B satisfies the second preset condition;

The network element #A determines, according to the network configuration information #A, the serving network set #C that satisfies the above-mentioned condition #A (that is, the first preset condition);

The network element #A determines the service network set #D according to the service network set #A, the service network set #B and the service network set #C, the service network set #D includes the service network set #A, the service network set #B and the service network set #D. The intersection of network sets #C;

The network element #A determines the priority of each service network in the service network set #D according to the information #A;

Network element #A determines the target service network according to the priority of each service network in the service network set #D;

In a possible implementation manner, the target service network is the service network with the highest priority in the service network set #D;

The network element #A determines the serving cell corresponding to the target serving network according to the correspondence between the serving cell and the serving network in the information #B, and determines it as the target serving cell.

By way of example and not limitation, the signal quality of the serving cell corresponding to each serving network in the serving cell set #B satisfying the second preset condition includes: the signal quality of the serving cell corresponding to each serving network in the serving cell set #B The average value is greater than or equal to the preset threshold value #A.

In a possible implementation manner, the preset threshold value #A corresponding to the above signal level value may be set by the network element #A.

It should be noted that when the target serving network corresponds to more than one serving cell, the serving cell with the highest signal quality can be determined as the target serving cell according to the above-mentioned information #B.

It should also be noted that this application does not limit the order in which network element #A determines the above-mentioned service network set #A, service network set #B, and service network set #C, nor does it limit network element #A according to the above-mentioned service network set. #A, service network set #B and service network set #C determine the order of service network set #D, for example, network element #A can first determine the above-mentioned service network set #A, service network set #B and service network set #C The intersection of any two service network sets in the set, and then determine the intersection of the intersection with the rest of the service network sets, as long as the service network set #D can be determined, this application determines the determination method and order in the determination service network set #D. Not limited.

It should also be noted that if the serving network set #D is an empty set, it means that the terminal device fails to switch to the target serving network and target serving cell this time, and the terminal device still chooses to camp on the source serving network and the source serving cell.

In a possible implementation manner, the network element #A may determine the target serving cell according to the information #B and the network configuration information #A corresponding to the network element #A, and the specific process may be:

The network element #A determines the service network set #C that satisfies the above condition #A according to the network configuration information #A;

The network element #A determines the service network set #E according to the above-mentioned service network set #B and the service network set #C, and the service network set #E includes the intersection of the service network set #B and the service network set #C;

If the serving network set #E includes the source serving network, the network element #A determines the serving cell corresponding to the source serving network as the target serving cell according to the correspondence between the serving cell and the serving network in the information #B. At this time, the terminal device There is no need to switch the serving network, and it still chooses to stay in the source serving network, and only needs to switch the source serving cell of the terminal device to the target serving cell. When the network and the serving cell are switched, the priority of the source serving network of the UE is the serving network with the highest priority.

It should be noted that when the source serving network corresponds to more than one serving cell, the serving cell with the highest signal quality can be determined as the target serving cell according to the above-mentioned information #B.

S304, network element #A sends request information #a to network element #B, where request information #a is used to request to switch the terminal device from the source serving network to the target serving network and to switch the terminal device from the source serving cell to The target serving cell, the request information #a is also used to indicate the target serving network and the target serving cell.

In a possible implementation manner, network element #A sends a handover request (Handover Required) message (ie, request information #a) to network element #B, where the Handover Required message and the request information #a are used to request the terminal device Handover from the source serving network to the target serving network and handover of the terminal device from the source serving cell to the target serving cell, the Handover Required message carries the indication information used to indicate the target serving network and the target serving cell, such as the target service Identification information of the network and the target serving cell.

S305, the network element #B judges whether the target service network satisfies the condition #A according to the network configuration information #B corresponding to the network element #B.

Optionally, the network element #B can also judge whether each service network in the service network set #A indicated by the information #A satisfies the condition #A according to the network configuration information #B corresponding to the network element #B.

Optionally, if the network element #B determines that the target service network does not satisfy the condition #A according to the network configuration information #B corresponding to the network element #B, the following steps S306 to S307 can be performed.

S306, the network element #B sends response information #a to the network element #A, where the response information #a is used to reject the handover of the terminal device from the source serving network to the target serving network and the handover of the terminal device from the source serving cell to the target serving cell request.

In a possible implementation manner, network element #B sends a handover preparation failure (HANDOVER PREPARATION FAILURE) message to network element #A, where the HANDOVER PREPARATION FAILURE message is used to reject the terminal device from switching from the source service network to the target service network and A request for the terminal device to handover from the source serving cell to the target serving cell.

In a possible implementation manner, the response message #a includes indication information for rejecting the above handover request and a reason for rejection.

By way of example and not limitation, the reason for rejection may be that the target serving network is performing congestion control in the current time period and/or the target network is unreachable in the current time period.

Optionally, network element #B may determine the first candidate service network set accessible to the terminal device according to network configuration information #B and information #A, and each service network in the first candidate service network set satisfies this condition. #A, the above-mentioned response information #a may also include the first candidate service network set.

In a possible implementation manner, the first candidate service network set includes all or part of the service networks that satisfy the condition #A in the service network set #A determined by the network element #B according to the network configuration information #B.

S307, the network element #A updates the network configuration information #A according to the response information #a, that is, the network element #A updates the service network set #C indicated by the network configuration information #A and satisfying the condition #A according to the response information #a.

In a possible implementation manner, network element #A determines the target service network as a service network that does not satisfy condition #A according to the indication information in response information #a that rejects the above handover request, and network element #A updates the network accordingly. The above-mentioned service network set #C that satisfies the condition #A indicated by the configuration information #A.

Optionally, the rejection reason in the response information #a includes the time information that the target service network is unreachable, and the network element #A starts and sets a timer according to the time information that the target service network is unreachable, before the timer expires or Before network element #B notifies that the target network is reachable, network element #A stops sending or forwarding information about handover to all cells belonging to the unreachable target serving network.

In a possible implementation manner, the response information #a further includes the first candidate service network set determined by network element #B, and network element #A determines the service network set within the current time period according to the first candidate service network set For the service network in #A that satisfies the condition #A, the next time the terminal device needs to switch between the service network and the serving cell, the target service network can be determined from the first candidate service network, so as to improve the switching service network and service network for the terminal device. Efficiency and success rate of the cell.

If the network element #B determines that the target service network satisfies the condition #A according to the network configuration information #B corresponding to the network element #B, steps S308 to 309 can be executed.

S308, network element #B sends request information #b to network element #C, where request information #b is used to request to switch the terminal device from the source serving network to the target serving network and to switch the terminal device from the source serving cell to the target serving cell, the request information #b is also used to indicate the target serving network and the target serving cell.

In a possible implementation manner, network element #B sends a UE context establishment request (Namf_Communication_CreateUEContext Request) message (namely request information #b) to network element #C, and the Namf_Communication_CreateUEContext Request message is used to request that the terminal device be Handover of the serving network to the target serving network and handover of the terminal device from the source serving cell to the target serving cell, and for indicating the target serving network and the target serving cell.

In a possible implementation manner, the request information #b includes the above-mentioned information #A and indication information for indicating the target serving network and the target serving cell.

In a possible implementation manner, the request information #b includes the above-mentioned request information #a and the above-mentioned information #A, and the network element #B can directly forward the above-mentioned request information #a and the above-mentioned information #A to the network element # C.

Optionally, after acquiring the above-mentioned information #A, the network element #C stores the information #A.

It should be noted that the above network element #C is determined by the network element #B according to the request information #a, and the network element #C corresponds to the target service network. Exemplarily, the above network element #C is determined by the network element #B according to the request information #a. The indication information (for example, the identity identifier (TARGET ID) of the target serving network) carried in the request information #a and used to indicate the target serving network and the target serving cell is determined.

S309, the network element #C judges whether the target service network satisfies the condition #A according to the network configuration information #C corresponding to the network element #C.

In a possible implementation manner, the above condition #A includes that the network quality of the target service network meets the requirements and/or the target service network is reachable within the current time period.

Optionally, the network element #C may also judge whether each service network in the service network set #A in the information #A satisfies the condition #A according to the network configuration information #C corresponding to the network element #C.

Optionally, if the network element #C determines that the target service network does not satisfy the condition #A according to the network configuration information #C corresponding to the network element #C, the following steps S111 to S114 can be performed.

S310, the network element #C sends response information #b1 to the network element #B, where the response information #b1 is used for rejecting the handover of the terminal device from the source serving network to the target serving network and the handover of the terminal device from the source serving cell to the target Serving cell request.

In a possible implementation manner, network element #C sends a UE context establishment response (Namf_Communication_CreateUEContext Response) message (response information #b1) to network element #B, and the Namf_Communication_CreateUEContext Response message is used to reject the terminal device from the source service A network handover to a target serving network and a request to handover the terminal device from the source serving cell to the target serving cell.

In a possible implementation manner, the response information #b1 includes indication information for rejecting the above handover request and a reason for rejection.

Optionally, network element #C may determine a second candidate service network set accessible to the terminal device according to network configuration information #C and information #A, and each service network in the second candidate service network set satisfies this condition. #A, the above-mentioned response information #b1 may also include the second candidate service network set.

In a possible implementation manner, the above-mentioned second candidate service network set includes all or part of the service networks that satisfy the condition #A in the service network set #A determined by the network element #C according to the network configuration information #C.

S311, the network element #B updates the network configuration information #B according to the response information #b1, that is, the network element #B updates the service network set that satisfies the condition #A indicated by the network configuration information #B according to the response information #b1.

In a possible implementation manner, network element #B determines the target service network as a service network that does not satisfy condition #A according to the indication information of rejecting the above handover request in response information #b1, and network element #B updates the current The set of service networks that satisfy condition #A during the time period.

Optionally, the rejection reason in the response information #b1 includes the time information that the target service network is unreachable, and the network element #B starts and sets a timer according to the time information that the target service network is unreachable, before the timer expires or Before the network element #C notifies that the target network is reachable, the network element #B stops sending or forwarding information about handover to all cells belonging to the target serving network that are not reachable.

In a possible implementation manner, the response information #b1 further includes the second candidate service network set determined by the network element #C, and the network element #A can obtain the second candidate service network set through the network element #B, The network element #A can determine, according to the second candidate serving network set, the serving network in the serving network set #A that satisfies the condition #A in the current time period. A target serving network is determined in the second candidate serving network, so as to improve the efficiency and success rate of switching between the serving network and the serving cell by the terminal device.

S312, the network element #B sends the response information #b2 to the network element #A, where the response information #b2 is used to reject the handover of the terminal device from the source serving network to the target serving network and the handover of the terminal device from the source serving cell to the target Serving cell request.

In a possible implementation manner, network element #B sends a handover preparation failure (HANDOVER PRE PARATION FAILURE) message to network element #A, where the HANDOVER PREPARATION FAILURE message is used to refuse to hand over the terminal device from the source service network to the target service The network and a request for handover of the terminal device from the source serving cell to the target serving cell.

In a possible implementation manner, the response information #b2 includes indication information for rejecting the above handover request and the reason for rejection.

Optionally, the network element #C may determine the second candidate service network set according to the network configuration information #C and the information #A, and the response information #b2 may further include the second candidate service network set.

S313, the network element #A updates the network configuration information #A according to the response information #b2, that is, the network element #A updates the service network set #C that satisfies the condition #A indicated by the network configuration information #A according to the response information #b2.

In a possible implementation manner, network element #A determines the target service network as a service network that does not meet condition #A according to the indication information in response information #b2 that rejects the above handover request, and network element #A updates the current The set of service networks that satisfy condition #A during the time period.

Optionally, the rejection reason in response information #b2 includes time information that the target service network is unreachable, and network element #A starts and sets a timer according to the time information that the target service network is unreachable, before the timer expires or Before network element #B notifies that the target network is reachable, network element #A stops sending or forwarding information about handover to all cells belonging to the unreachable target serving network.

In a possible implementation manner, the response information #b2 further includes the second candidate service network set determined by the network element #C, and the network element #A may determine the service network within the current time period according to the second candidate service network set The service network that satisfies the condition #A in the set #A, when the terminal equipment needs to switch between the service network and the serving cell next time, the target service network can be determined from the second candidate service network, so as to improve the switching service network and the service network of the terminal equipment. Efficiency and success rate of serving cells.

If the network element #C determines that the target service network satisfies the condition #A according to the network configuration information #C corresponding to the network element #C, the following steps S115 to S116 can be performed.

S314, network element #C sends request information #c to network element #D, where request information #c is used to request to switch the terminal device from the source serving network to the target serving network and to switch the terminal device from the source serving cell to the target The serving cell, the request information #c is also used to indicate the target serving network and the target serving cell.

In a possible implementation manner, network element #C sends a Handover Request message (that is, request information #c) to network element #D, where the Handover Request message is used to request that the terminal device be switched from the source service network to the target service network and handover the terminal device from the source serving cell to the target serving cell, and for indicating the target serving network and the target serving cell.

In a possible implementation manner, the request information #c includes the above-mentioned information #A and indication information for indicating the target serving network and the target serving cell.

In a possible implementation manner, the request information #c includes the above-mentioned request information #a and the above-mentioned information #A, and the network element #C can directly forward the above-mentioned request information #a and the above-mentioned information #A to the network element# D.

Optionally, after acquiring the above-mentioned information #A, the network element #D stores the information #A.

S315, the network element #D determines whether the target service network satisfies the condition #A according to the network configuration information #D corresponding to the network element #D.

Optionally, the network element #D may further judge whether each service network in the service network set #A in the information #A satisfies the condition #A according to the network configuration information #D corresponding to the network element #D.

Optionally, if the network element #D determines that the target service network does not meet the condition #A according to the network configuration information #D corresponding to the network element #D, the following steps S216 to S221 can be performed.

S316, the network element #D sends the response information #c1 to the network element #C, where the response information #c1 is used to reject the handover of the terminal device from the source serving network to the target serving network and the handover of the terminal device from the source serving cell to the target Serving cell request.

In a possible implementation manner, network element #D sends a Handover Request Acknowledge message (ie, response information #c1) to network element #C, and the Handover Request Acknowledge message is used to reject the terminal device from the source A request for handover of the serving network to the target serving network and handover of the terminal device from the source serving cell to the target serving cell.

In a possible implementation manner, the response information #c1 includes indication information for rejecting the above handover request and a reason for rejection.

Optionally, network element #D may determine a third candidate service network set accessible to the terminal device according to network configuration information #D and information #A, and each service network in the third candidate service network set satisfies this condition. #A, the above-mentioned response information #c1 may also include the third candidate service network set.

In a possible implementation manner, the above-mentioned third candidate service network set includes all or part of the service networks that satisfy the condition #A in the service network set #A determined by the network element #D according to the network configuration information #D.

S317, the network element #C updates the network configuration information #C according to the response information #c1, that is, the network element #C updates the service network set that satisfies the condition #A indicated by the network configuration information #C according to the response information #c1.

In a possible implementation manner, network element #C determines the target service network as a service network that does not meet condition #A according to the indication information in response information #c1 that rejects the above handover request, and network element #C updates the current The set of service networks that satisfy condition #A during the time period.

Optionally, the rejection reason included in the response information #c1 includes the time information that the target service network is unreachable, and the network element #C starts and sets a timer according to the time information that the target service network is unreachable, before the timer expires. Or, before the network element #D notifies that the target network is reachable, the network element #C stops sending or forwarding information about handover to all cells belonging to the target serving network that are not reachable.

In a possible implementation manner, the above-mentioned response information #c1 further includes the third candidate service network set determined by network element #D, and network element #A can obtain the third candidate service network set through network element #C and network element #B Serving network set, network element #A can determine, according to the third candidate serving network set, the serving network that satisfies condition #A in serving network set #A in the current time period, and the next time the terminal device needs to switch between serving network and serving cell , the target serving network can be determined from the third candidate serving network, so as to improve the efficiency and success rate of the terminal device switching between the serving network and the serving cell.

S318, the network element #C sends the response information #c2 to the network element #B, where the response information #c2 is used to reject the handover of the terminal device from the source serving network to the target serving network and the handover of the terminal device from the source serving cell to the target Serving cell request.

In a possible implementation manner, network element #C sends a UE context establishment response (Namf_Communication_CreateUEContext Response) message (response information #c2) to network element #B, and the Namf_Communication_CreateUEContext Response message is used to reject the terminal device from the source service A network handover to a target serving network and a request to handover the terminal device from the source serving cell to the target serving cell.

In a possible implementation manner, the response information #c2 includes indication information for rejecting the above handover request and a reason for rejection.

Optionally, the network element #D may determine the third candidate service network set according to the network configuration information #D and the information #A, and the above-mentioned response information #c2 may further include the third candidate service network set.

S319, the network element #B updates the network configuration information #B according to the response information #c2, that is, the network element #B updates the service network set that satisfies the condition #A indicated by the network configuration information #B according to the response information #c2.

In a possible implementation manner, network element #B determines the target service network as a service network that does not satisfy condition #A according to the indication information of rejecting the above handover request in response information #c2, and network element #B updates the current The set of service networks that satisfy condition #A during the time period.

Optionally, the rejection reason included in the response information #c2 includes the time information that the target service network is unreachable, and the network element #B starts and sets a timer according to the time information that the target service network is unreachable, before the timer expires. Or, before the network element #C notifies that the target network is reachable, the network element #B stops sending or forwarding information about handover to all cells belonging to the target serving network that are not reachable.

In a possible implementation manner, the response information #c2 further includes the third candidate service network set determined by the network element #D, and the network element #A can obtain the third candidate service network set through the network element #B, The network element #A can determine, according to the third candidate serving network set, the serving network in the serving network set #A that satisfies the condition #A in the current time period. A target serving network is determined in the third candidate serving network, so as to improve the efficiency and success rate of switching between the serving network and the serving cell by the terminal device.

S320, the network element #B sends the response information #c3 to the network element #A, where the response information #c3 is used to reject the handover of the terminal device from the source serving network to the target serving network and the handover of the terminal device from the source serving cell to the target Serving cell request.

In a possible implementation manner, network element #B sends a HANDOVER PREPARATION FAILURE message to network element #A, where the HANDOVER PREPARATION FAILURE message is used to refuse to switch the terminal device from the source service network to the target service network and the terminal device A request for a device to handover from a source serving cell to a target serving cell.

In a possible implementation manner, the response information #c3 includes indication information for rejecting the above handover request and the reason for rejection.

Optionally, the network element #D may determine the third candidate service network set according to the network configuration information #D and the information #A, and the above-mentioned response information #c3 may further include the third candidate service network set.

S321, the network element #A updates the network configuration information #A according to the response information #c3, that is, the network element #A updates the service network set #C that satisfies the condition #A indicated by the network configuration information #A according to the response information #c3.

In a possible implementation manner, network element #A determines the target service network as a service network that does not meet condition #A according to the indication information in response information #c3 for rejecting the above handover request, and network element #A updates the current The set of service networks that satisfy condition #A during the time period.

Optionally, the rejection reason in the response information #c3 includes the time information that the target service network is unreachable, and the network element #A starts and sets a timer according to the time information that the target service network is unreachable, before the timer expires or Before network element #B notifies that the target network is reachable, network element #A stops sending or forwarding information about handover to all cells belonging to the unreachable target serving network.

In a possible implementation manner, the above-mentioned response information #c3 further includes the third candidate service network set determined by network element #D, and network element #A may determine the service network within the current time period according to the third candidate service network set The service network that satisfies condition #A in the set #A, when the terminal equipment needs to switch between the service network and the serving cell next time, the target service network can be determined from the third candidate service network, so as to improve the switching service network and the terminal equipment. Efficiency and success rate of serving cells.

In a possible implementation manner, the above-mentioned response information #c3 further includes the third candidate service network set determined by network element #D, and network element #A updates the current time period according to the third candidate service network set to satisfy the condition# A's service network set.

If the network element #D determines that the target service network satisfies the condition #A according to the network configuration information #D corresponding to the network element #D, the following steps S222 to S224 can be executed.

S322, the network element #D sends response information #c4 to the network element #C, where the response information #c4 is used to accept the handover of the terminal device from the source serving network to the target serving network and the handover of the terminal device from the source serving cell to the target Serving cell request.

S323, the network element #C sends the response information #c5 to the network element #B, where the response information #c5 is used to accept the handover of the terminal device from the source serving network to the target serving network and the handover of the terminal device from the source serving cell to the target Serving cell request.

S324, switch the terminal device from the source serving network to the target serving network, and switch the terminal device from the source serving cell to the target serving cell.

It should be noted that when the target serving network and the target serving cell are determined, and the network element #D on the target serving network side accepts the handover request, the handover execution flow can be entered, the source serving network is handed over to the target serving network, and The source serving cell is switched to the target serving cell. For the handover execution flow here, refer to the corresponding handover execution flow in the prior art. For example, refer to the handover execution described in Section 4.9.1.3.3 of TS 23.502 in the 3GPP standard. The process is not repeated in this application.

In the above-mentioned network handover method 300, when the UE needs to perform handover between the mobility service network and the serving cell, the source serving network can select the target handover network and the target handover cell for the UE according to information #A and information #B. Specifically, after the network element #A on the source serving network side obtains the information #A and the information #B, the network element #A determines the target serving network and the target serving cell based on the information #A and the information #B, and the network element #A initiates the For a handover request, NE #B on the source serving network side, NE #C and NE #D on the target serving network side will decide whether to accept the handover request based on their respective network configuration information, and notify the source serving network side of the final result. NE #A or the source serving cell, if NE #B on the source serving network side, NE #C and NE #D on the target serving network side accept the handover request based on their respective network configuration information, that is, A handover procedure can be performed to switch the source serving network to the target serving network and the source serving cell to the target serving cell.

In a possible implementation manner, the way in which the network element #A on the source serving network side obtains the information #A may be obtained from the network element #B on the source serving network side. By way of example and not limitation, network element #B is the source serving network. The mobility management network element on the core network side of the network, network element #A is the RAN on the source serving network side, network element #B can first obtain information #A from the UDM according to the standard registration process of the UE, and network element #A The UE context initial establishment procedure and the UE context modification procedure in the prior art acquire and update the information #A. Optionally, this information #A may be stored in network element #B and network element #A as part of the UE context.

It should be noted that, when network element #B on the source serving network side, network element #C and network element #D on the target serving network side decide whether to receive the handover request based on the relevant network configuration information, it may also be based on the relevant network configuration information. With information #A to determine the candidate service network set that satisfies the condition, each network element can carry the candidate service network set in the response information sent to other network elements, and other network elements can update the local service meeting the condition according to the candidate network set. network set.

In a possible implementation manner, network element #B and network element #A are the mobility management network element on the core network side of the source serving network and the RAN on the source serving network side, respectively, and network element #C and network element #D are respectively are the mobility management network element on the core network side of the target serving network and the RAN on the target serving network side, and information #A is the network selection information of the UE.

The above-mentioned network switching method 300 can be used in a service network based on a core network interface (such as an N2 interface). In the network switching method 300, the network element #A on the source serving network side cannot directly communicate with the network element #D on the target serving network side, The network element #A needs to communicate with the network element #D through the network element #B on the source serving network side and the network element #C on the target serving network side. When the network element #A on the source serving network side can directly communicate with the network element #D on the target serving network side, the network switching method 400 in FIG. 4 can be used to select and switch the target serving network and the target serving cell.

In a possible implementation manner, the scenario in which the network element #A on the source serving network side can directly communicate with the network element #D on the target serving network side may be: network element #A and network element #D are respectively the source serving network element The RAN on the network side (can be recorded as S-RAN) and the RAN on the target serving network side (can be recorded as T-RAN), the source serving network and the target serving network are deployed in a network sharing manner, S-RAN and T-RAN There is an Xn interface connection for direct communication.

Next, still take the source service network and the target service network as the fifth-generation system network as an example, with reference to FIG. The network switching method 400 in the application is described in detail. Among them, network element #B and network element #A belong to the source service network, and network element #C and network element #D belong to the target service network.

Steps S401-S403 are similar to steps S301-S303 in the network switching method 300, and the description of steps S301-S303 can be referred to, and details are not repeated here.

S404, network element #A sends request information #d to network element #D, where request information #d is used to request to switch the terminal device from the source serving network to the target serving network and to switch the terminal device from the source serving cell to the target serving cell, the request information #d is also used to indicate the target serving network and the target serving cell.

In a possible implementation manner, the request information #d includes the above-mentioned information #A and indication information for indicating the target serving network and the target serving cell.

In a possible implementation manner, network element #A sends a Handover Request message (that is, request information #d) to network element #D, where the Handover Request message is used to request that the terminal device be switched from the source service network to the target service network and handover the terminal device from the source serving cell to the target serving cell, and for indicating the target serving network and the target serving cell.

S405, the network element #D determines whether the target service network satisfies the condition #A according to the network configuration information #D corresponding to the network element #D.

Optionally, the network element #D can also judge whether each service network in the service network set #A in the information #A satisfies the condition #A according to the network configuration information #D corresponding to the network element #D, and set the service network set# All or part of the serving networks in A that satisfy the condition #A are determined as the third candidate serving network set.

Optionally, if network element #D determines that the target service network does not meet condition #A according to network configuration information #D corresponding to network element #D, or if network element #D determines that the current If the target service network does not allow handover in, the following steps S406 to S407 can be executed.

S406, the network element #D sends the response information #d1 to the network element #A, where the response information #d1 includes the indication information of the new target service network and the handover indication information.

Optionally, the network element #D may determine the third candidate service network set according to the network configuration information #D and the information #A, and the response information #d1 may further include the third candidate service network set.

Optionally, the third candidate service network set includes all or part of the service networks that satisfy the condition #A in the service network set #A determined by the network element #D according to the network configuration information #D.

In a possible implementation manner, network element #D may select a new service network that can be switched to from the third candidate service network set, for example, may select the service network with the best network quality in the third candidate service network set It is determined as a new target serving network, and the response information #d1 carries indication information for indicating the new target serving network and handover indication information for switching to the new target serving network.

It should be understood that if network element #A receives the response information #d1 sent by network element #D, and the response information #d1 carries the indication information for indicating the new target serving network and switching to the new target In the handover instruction letter of the serving network, the network element #A can send the indication information of the new target serving network and the handover indication information to the UE, and the UE can initiate handover to the new target serving network according to the information.

Optionally, the response information #d1 can also be used to reject the request for switching the terminal device from the source serving network to the target serving network and switching the terminal device from the source serving cell to the target serving cell. Further, the response information #d1 may also include indication information for rejecting the above handover request and reasons for rejection.

Optionally, if the above-mentioned response information #d1 includes the third candidate service network set, step 407 may also be performed.

S407, the network element #A updates the network configuration information #A according to the response information #d1, that is, the network element #A updates the service network set #C that satisfies the condition #A indicated by the network configuration information #A according to the response information #d1.

In a possible implementation manner, the above-mentioned response information #d1 further includes the third candidate service network set determined by network element #D, and network element #A may determine the service network within the current time period according to the third candidate service network set The service network that satisfies condition #A in the set #A, when the terminal equipment needs to switch between the service network and the serving cell next time, the target service network can be determined from the third candidate service network, so as to improve the switching service network and the terminal equipment. Efficiency and success rate of serving cells.

Optionally, the network element #A determines the service network that satisfies the condition #A according to the third candidate service network set in the response information #d1, and accordingly the network element #A updates the service network set that satisfies the condition #A in the current time period. .

Optionally, network element #A determines the target service network as a service network that does not satisfy condition #A according to the indication information in response information #d1 for rejecting the above handover request, and accordingly network element #A updates the current time period that meets the condition. #A's service network set.

Optionally, the rejection reason in the response information #d1 includes the time information that the target service network is unreachable, and the network element #A starts and sets a timer according to the time information that the target service network is unreachable, before the timer expires or Before network element #D notifies that the target network is reachable, network element #A stops sending or forwarding information about handover to all cells belonging to the target serving network that are not reachable.

If the network element #D judges that the target service network satisfies the condition #A according to the network configuration information #D corresponding to the network element #D, or if the network element #D judges that the current target service network requested by the network element #A allows the handover input, the following steps S408 to S409 can be performed.

S408, the network element #C sends response information #d2 to the network element #B, where the response information #d2 is used to accept the handover of the terminal device from the source serving network to the target serving network and the handover of the terminal device from the source serving cell to the target Serving cell request.

S409, switch the terminal device from the source serving network to the target serving network, and switch the terminal device from the source serving cell to the target serving cell.

Optionally, the above-mentioned response information #d1 and response information #d2 may be of the same information type.

It should also be noted that, for the scenario in which the network element #A on the source serving network side can directly communicate with the network element #D on the target serving network side in this embodiment, the target serving cell may belong to multiple serving networks, and this If the handover of the target serving network fails, another serving network corresponding to the target serving cell can be selected as a new target serving network for handover to improve the success rate of handover of the terminal device to the target serving cell.

When the source serving network side can obtain the above-mentioned information #A to select the target serving network and the target serving cell, the network handover method 300 in the second embodiment and the network handover method 400 in the third embodiment can be used. However, when the source serving network side cannot obtain the above-mentioned information #A, the method 500 in the following fourth embodiment can be used to select the target serving network and the target serving cell.

The method 500 for selecting a target serving network and a target serving cell in the third embodiment will be further introduced below with reference to FIG. 5 .

S501, the terminal device obtains information #A, which indicates the service network set #A that the terminal device can access, and the priority corresponding to each service network in the service network set #A.

In a possible implementation manner, the information #A is network selection policy information preconfigured by the terminal device (may also be referred to as UE network selection information). As an example and not a limitation, the network selection information of the UE may include, but is not limited to, the following: a list of independently deployed non-public networks controlled by the UE, and network priorities corresponding to each network therein; and/or independently deployed non-public networks controlled by the network A list of public networks, and a network priority corresponding to each network therein; and/or a list of network-controlled network groups, and a priority corresponding to each network group therein.

S502, the terminal device obtains information #B, the information #B is used to determine the serving cell set #F, the serving network corresponding to each serving cell in the serving cell set #F, and each serving cell in the serving cell set #F The signal level value corresponding to the cell, wherein the signal level value corresponding to each serving cell in the serving cell set #F satisfies the fourth preset condition.

It should be noted that the serving network set #F includes a serving network corresponding to each serving cell in the serving cell set #F.

It should be understood that when the UE performs mobility measurement, it does not measure all cells, but only measures the radio signal quality of cells that meet certain conditions (such as the fourth preset condition). When reporting the radio signal quality of the cells that are in the RAN to the RAN, the RAN can screen these cells again according to actual needs. For example, when the RAN determines the target serving cell, the serving cell that meets the second preset condition can be screened again.

Optionally, the above-mentioned fourth preset condition and second preset condition may be pre-configured by the network side.

Optionally, the terminal device can acquire the information #B through mobility measurement.

S503, the terminal device determines information #C according to the information #A and the information #B, where the information #C is used to indicate the serving cell set #G accessible to the terminal device and the service corresponding to each serving cell in the serving cell set #G The network and the priority corresponding to each serving network, the signal quality corresponding to each serving cell in the serving cell set #G satisfies the fourth preset condition.

In a possible implementation manner, the process for the terminal device to determine the information #C according to the information #A and the information #B may be:

The terminal device determines the service network set #A that the terminal device can access according to the information #A;

The terminal device determines the serving network set #F according to the information #B, and the signal quality of the serving cell corresponding to each serving network in the serving network set #F satisfies the fourth preset condition;

The terminal device determines the service network set #G according to the above-mentioned service network set #A and the service network set #F, and the service network set #G includes the intersection of the service network set #A and the service network set #F;

The terminal device determines the priority of each service network in the service network set #G according to the information #A;

The terminal device determines the serving cell corresponding to each serving network in the serving network set #G according to the correspondence between the serving cell and the serving network in the information #B;

The terminal device determines information #C, which is used to indicate the serving cell set #G accessible to the terminal device, the serving network corresponding to each serving cell in the serving cell set #G, and the serving network corresponding to each serving network. priority, the signal quality corresponding to each serving cell in the serving cell set #G satisfies the fourth preset condition.

By way of example and not limitation, the signal quality of the serving cell corresponding to each serving network in the serving cell set #F satisfying the fourth preset condition includes: the signal quality of the serving cell corresponding to each serving network in the serving cell set #F The average value is greater than or equal to the preset threshold value #B.

In a possible implementation manner, the preset threshold value #B corresponding to the above signal level value may be set by the network element #A.

S504, the terminal device sends the information #C to the network element #A.

S505, the network element #A determines the target serving network and the target serving cell according to the information #C.

It should be understood that the specific examples in the embodiments of the present application are only for helping those skilled in the art to better understand the embodiments of the present application, rather than limiting the scope of the embodiments of the present application.

It should also be understood that the size of the sequence numbers of the above processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

It should also be understood that, in the various embodiments of the present application, if there is no special description or logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments New embodiments can be combined according to their inherent logical relationships.

It should also be noted that, in this embodiment of the present application, "pre-set", "pre-configured", etc. may be pre-saved in a device (for example, a network device) by a corresponding code, a table, or other methods that can be used to indicate relevant information The present application does not limit the specific implementation manner, such as the preset rules and preset constants in the embodiments of the present application.

It can be understood that, in the foregoing embodiments of the present application, the method implemented by the communication device may also be implemented by a component (for example, a chip or a circuit) that can be configured inside the communication device.

In the above, the network switching method provided by the embodiments of the present application is described in detail with reference to FIG. 2 to FIG. 5 . The above methods in FIG. 3 to FIG. 5 are mainly introduced from the perspective of interaction between various network elements. It can be understood that, in order to implement the above-mentioned functions, each network element includes corresponding hardware structures and/or software modules for performing each function. Those skilled in the art should realize that the present application can be implemented in hardware or a combination of hardware and computer software with the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Hereinafter, the apparatus for network switching provided by the embodiments of the present application will be described in detail with reference to FIG. 6 to FIG. 7 . It should be understood that the description of the apparatus embodiment corresponds to the description of the method embodiment. Therefore, for the content that is not described in detail, reference may be made to the above method embodiment, and for the sake of brevity, some content will not be repeated.

In this embodiment of the present application, the transmitting-end device or the receiving-end device may be divided into functional modules according to the foregoing method examples. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. middle. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation. The following description will be given by taking as an example that each function module is divided corresponding to each function.

FIG. 6 is a schematic structural diagram of a network switching apparatus 600 . The communication apparatus includes a processing unit 610 and a transceiver unit 620, and the network switching apparatus 600 may be a device corresponding to network element #A, a device corresponding to network element #B, a device corresponding to network element #C, The device corresponding to network element #D, the device corresponding to the first network element, the device corresponding to the second network element, or the terminal device may also be used to implement the functions of the device or terminal device corresponding to the network element in the above method embodiments. chip.

It should be understood that the communication apparatus 600 may correspond to equipment corresponding to each network element in the methods 200 to 500 according to the embodiments of the present application, and the communication apparatus 600 may include a device for executing the corresponding equipment of each network element in FIG. 2 to FIG. 5 . The unit of the method that the device executes. Moreover, each unit in the communication device 600 and the above-mentioned other operations and/or functions respectively implement the corresponding processes of the method 200 to the method 500 in FIG. 2 to FIG. 5 .

In a possible design, the communication apparatus 600 may implement any function possessed by the network element #A in the embodiment shown in any one of FIG. 3 to FIG. 5 or the first network element in FIG. 2 .

For example, the processing unit 610 is configured for the first network element to determine a plurality of first service networks and a priority corresponding to each of the first service networks;

The processing unit 610 is further configured for the first network element to determine a target service network from the plurality of first service networks according to the priority corresponding to each of the first service networks.

Optionally, the processing unit 610 is further configured for the first network element to determine a first service network set, where the first service network set includes accessible service networks of the terminal device, and the first service network set includes The serving network satisfies a first preset condition, and the first preset condition is used to determine whether the serving network satisfies the handover requirement of the terminal device;

The processing unit 610 is further configured for the first network element to determine the first service network set according to the third information.

Optionally, the processing unit 610 is further configured for the first network element to determine a second serving network set, and the signal quality of the serving cell corresponding to the serving network in the second serving network set satisfies the second preset condition;

The processing unit 610 is further configured for the first network element to determine the multiple first service networks according to the first service network set and the second service network set, where the multiple first service networks belong to the first service network set and the intersection of the second set of service networks.

Optionally, the processing unit 610 is further configured for the first network element to determine a third service network set according to the first information, where the third service network set includes accessible service networks of the terminal device, and the first information Including the pre-configured network selection policy information of the terminal device;

The processing unit 610 is further configured for the first network element to determine a fourth service network set according to the second information, where the service networks in the fourth service network set meet a first preset condition, and the first preset condition is used to determine the service Whether the network meets the handover requirement of the terminal device, and the second information includes the network configuration information of the first network element;

The processing unit 610 is further configured for the first network element to determine the first service network set according to the third service network set and the fourth service network set, where the first service network set belongs to the third service network set and the fourth service network set The intersection of the fourth service network set.

Optionally, the processing unit 610 is further configured for the first network element to determine the priority corresponding to each of the first service networks according to the first information.

Optionally, before being used by the first network element to determine a plurality of first service networks, the processing unit 610 is further configured for the first network element to receive fourth information, where the fourth information is used to indicate a fifth service network set, the fifth service network set includes accessible service networks of the terminal device, and the signal quality of the serving cells corresponding to the service networks in the fifth service network set satisfies the second preset condition; and

The processing unit 610 is further configured for the first network element to determine the fifth service network set according to the fourth information;

The processing unit 610 is further configured for the first network element to determine a sixth service network set according to the second information, where the service networks in the sixth service network set satisfy a first preset condition, and the first preset condition is used to determine the service Whether the network meets the handover requirement of the terminal device, and the second information includes the network configuration information of the first network element;

The processing unit 610 is further configured for the first network element to determine the plurality of first service networks according to the fifth service network set and the sixth service network set, where the plurality of first service networks belong to the fifth service network set and the intersection of the sixth service network set.

Optionally, when the fourth information is further used to indicate the priority corresponding to each service network among multiple service networks accessible to the terminal device, the multiple service networks include the multiple first service networks, the The processing unit 610 is further configured for the first network element to determine the priority corresponding to each of the first service networks according to the fourth information.

Optionally, the first request information is further used to indicate a third service network set, where the third service network set includes accessible service networks of the terminal device.

The transceiver unit 620 is used for the first network element to send first request information to the second network element, where the first request information is used to request handover of the terminal device to a target serving cell, and the target serving cell belongs to the target serving network.

Optionally, the transceiver unit 620 is further configured for the first network element to receive third information, where the third information is used to indicate the first service network set.

Optionally, the transceiver unit 620 is further configured for the first network element to receive first response information for the first request information, where the first response information is used to indicate whether the terminal device is successfully handed over to the target serving cell, The first response information includes the third information.

Optionally, the transceiver unit 620 is further configured for the first network element to obtain first information from a third network element, where the first information is used to indicate each service in a plurality of service networks accessible to the terminal device The priority corresponding to the network, the multiple service networks include the multiple first service networks.

Optionally, before the transceiver unit 620 is used for the first network element to determine a plurality of first service networks, the transceiver unit 620 is further configured for the first network element to receive measurement report information of the terminal device, and the measurement report The fourth information is included in the information.

In another possible design, the communication apparatus 600 may implement the network element #B, network element #C or network element #D in the embodiment shown in any one of FIG. 3 to FIG. Any function possessed by the second network element.

For example, the processing unit 610 is configured for the fourth network element to determine a first service network set, where the first service network set includes accessible service networks of the terminal device, and the service networks in the first service network set satisfy the first preset A condition is set, and the first preset condition is used to determine whether the serving network satisfies the handover requirement of the terminal device.

Optionally, before the processing unit 610 is used for the fourth network element to determine the first service network set, the transceiver unit is further configured for the fourth network element to receive fifth information, where the fifth information is used to indicate the terminal device accessible service network; and

Optionally, the processing unit 610 is further configured for the fourth network element to determine the first service network set according to the fifth information and the first preset condition.

The transceiver unit 620 is used for the fourth network element to send third information, where the third information is used to indicate the first service network set.

Optionally, the transceiver unit 620, before the processing unit 610 is used by the fourth network element to determine the first service network set, the transceiver unit 620 is further used for the fourth network element to receive first request information, the first request The information is used to request that the terminal device be handed over to the target serving cell, and the first request information includes fifth information, where the fifth information is used to indicate an accessible serving network of the terminal device.

It should be noted that the second network element includes a mobility management function network element corresponding to the current service network of the terminal device, or the second network element includes a wireless access network network element corresponding to the target service network; the third network element including the mobility management function network element corresponding to the current service network of the terminal device, or the third network element including the wireless access network network element corresponding to the historical service network of the terminal device; the fourth network element including the current service network of the terminal device A mobility management function network element corresponding to the network, or the fourth network element includes a mobility management function network element corresponding to the target service network, or the fourth network element includes a wireless access network element corresponding to the target service network.

Optionally, the first preset condition includes that the serving network is reachable in the current time period and/or the network quality of the serving network satisfies the third preset condition.

FIG. 7 is a structural block diagram of a communication device 700 provided according to an embodiment of the present application. The communication device 700 shown in FIG. 7 includes: a processor 710 , a memory 720 and a communication interface 730 . The processor 710 is coupled to the memory for executing instructions stored in the memory to control the communication interface 730 to send and/or receive signals.

It should be understood that the above-mentioned processor 710 and the memory 720 may be combined into a processing device, and the processor 710 is configured to execute the program codes stored in the memory 720 to realize the above-mentioned functions. During specific implementation, the memory 720 may also be integrated in the processor 710 or independent of the processor 710 .

In a possible design, the communication device 700 may be the data analysis device or the network capability opening device in the above method embodiments, or may be the data analysis device or the network capability opening device used in the above method embodiments The functional chip of the device.

Specifically, the communication device 700 may correspond to the device corresponding to network element #A, the device corresponding to network element #B, the device corresponding to network element #C, and the device corresponding to network element #C in the methods 200 to 500 according to the embodiments of the present application The device corresponding to D, the device corresponding to the first network element, the device corresponding to the second network element, or the terminal device, the communication device 700 may include a communication device 700 for executing the method performed by the device corresponding to each network element in FIG. 2 to FIG. 5 . unit. In addition, each unit in the communication device 700 and the above-mentioned other operations and/or functions are respectively to implement the corresponding processes of the method 200 to the method 500 .

It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments, and for the sake of brevity, it will not be repeated here.

When the communication device 700 is a chip, the chip includes a transceiver unit and a processing unit. Wherein, the transceiver unit may be an input/output circuit or a communication interface; the processing unit may be a processor, a microprocessor or an integrated circuit integrated on the chip. The embodiment of the present application also provides a processing apparatus, including a processor and an interface. The processor may be used to execute the methods in the above method embodiments.

It should be understood that the above processing device may be a chip. For example, the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), or a It is a central processing unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), or a microcontroller (microcontroller unit). , MCU), it can also be a programmable logic device (PLD) or other integrated chips.

In the implementation process, each step of the above-mentioned method can be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware. To avoid repetition, detailed description is omitted here.

It should be noted that the processor in this embodiment of the present application may be an integrated circuit chip, which has a signal processing capability. In the implementation process, each step of the above method embodiments may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The aforementioned processors may be general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components . The methods, steps, and logic block diagrams disclosed in the embodiments of this application can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in this embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synch-link DRAM) , SLDRAM) and direct memory bus random access memory (direct ram-bus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

According to the method provided by the embodiments of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code is run on a computer, the computer is made to execute any one of the Methods of Examples.

According to the methods provided by the embodiments of the present application, the present application further provides a computer-readable medium, where program codes are stored in the computer-readable medium, and when the program codes are run on a computer, the computer is made to execute any one of the methods proposed in the present application. Methods of Examples.

According to the methods provided by the embodiments of the present application, the present application further provides a system, which includes the foregoing apparatus or equipment.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line, DSL) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that includes an integration of one or more available media. The available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, high-density digital video discs (DVDs)), or semiconductor media (eg, solid state discs, SSD)) etc.

The network-side equipment in each of the above apparatus embodiments corresponds to the terminal equipment and the network-side equipment or terminal equipment in the method embodiments, and corresponding steps are performed by corresponding modules or units, for example, the communication unit (communication interface) performs the receiving in the method embodiments. Or the step of sending, other steps except sending and receiving may be performed by the processing unit 610 (processor). For functions of specific units, reference may be made to corresponding method embodiments. The number of processors may be one or more.

The terms "component", "module", "system" and the like are used in this specification to refer to a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device may be components. One or more components may reside within a process and/or thread of execution, and a component may be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, be based on a signal having one or more data packets (eg, data from two components interacting with another component between a local system, a distributed system, and/or a network, such as the Internet interacting with other systems via signals) Communicate through local and/or remote processes.

It should also be understood that the term "and/or" in this document is only an association relationship for describing associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, and A and B exist at the same time. B, there are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

It should also be understood that the numbers "first", "second", "#a", "#b", "#1", "#2", etc. are introduced in the embodiments of the present application only to distinguish different objects, for example, To distinguish different "information", or, "network element", or, "preset conditions", or, "network configuration information", etc., the understanding of specific objects and the corresponding relationship between different objects should be based on their functions and internal It is determined by logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit 610, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A method for network handover, comprising:

The first network element determines a plurality of first service networks and a priority corresponding to each of the first service networks;

determining, by the first network element, a target service network from the plurality of first service networks according to a priority corresponding to each of the first service networks;

The first network element sends first request information to the second network element, where the first request information is used to request handover of the terminal device to a target serving cell, and the target serving cell belongs to the target serving network.
The method according to claim 1, wherein the determining, by the first network element, a plurality of first service networks comprises:

The first network element determines a first service network set, where the first service network set includes accessible service networks of the terminal device, and the service networks in the first service network set satisfy a first preset condition , the first preset condition is used to determine whether the serving network meets the handover requirement of the terminal device;

The first network element determines a second serving network set, and the signal quality of the serving cell corresponding to the serving network in the second serving network set satisfies a second preset condition;

The first network element determines the multiple first service networks according to the first service network set and the second service network set, and the multiple first service networks belong to the first service network set and the second service network set. The intersection of the second service network set.
The method according to claim 2, wherein the determining of the first service network set by the first network element comprises:

The first network element determines a third service network set according to the first information, where the third service network set includes accessible service networks of the terminal device, and the first information includes preconfigured service networks of the terminal device. Network selection policy information;

The first network element determines a fourth service network set according to the second information, the service networks in the fourth service network set satisfy a first preset condition, and the first preset condition is used to determine whether the service network satisfies the The handover requirement of the terminal device, the second information includes the network configuration information of the first network element;

The first network element determines the first service network set according to the third service network set and the fourth service network set, and the first service network set belongs to the third service network set and the fourth service network set. The intersection of the four service network sets.
The method according to claim 2, wherein the method further comprises:

The first network element receives third information, where the third information is used to indicate the first service network set and the priority corresponding to each service network in the first service network set; and

The first network element determining the first service network set includes:

The first network element determines the first serving network set according to the third information.
The method according to claim 4, wherein the method further comprises:

The first network element receives first response information for the first request information, where the first response information is used to indicate whether the terminal device is successfully handed over to the target serving cell, and the first response information contains including the third information.
The method according to any one of claims 1 to 4, wherein the method further comprises:

The first network element obtains the first information from the third network element, where the first information is used to indicate the priority corresponding to each service network among the multiple service networks accessible to the terminal device, and the multiple service networks can be accessed by the terminal device. a service network includes the plurality of first service networks; and

The first network element determining the priority corresponding to each of the first service networks includes:

The first network element determines, according to the first information, a priority corresponding to each of the first service networks.
The method according to claim 6, wherein the third network element comprises a mobility management function network element corresponding to the current serving network of the terminal device, or

The third network element includes a wireless access network network element corresponding to the historical service network of the terminal device.
The method according to claim 1, wherein before the first network element determines a plurality of first service networks, the method further comprises:

The first network element receives fourth information, where the fourth information is used to indicate a fifth service network set, the fifth service network set includes accessible service networks of the terminal device, and the fifth service network set The signal quality of the serving cell corresponding to the serving network in the serving network set satisfies the second preset condition; and

The first network element determining a plurality of first service networks includes:

determining, by the first network element, the fifth service network set according to the fourth information;

The first network element determines a sixth service network set according to the second information, where the service networks in the sixth service network set satisfy a first preset condition, and the first preset condition is used to determine whether the service network satisfies the The handover requirement of the terminal device, the second information includes the network configuration information of the first network element;

The first network element determines the plurality of first service networks according to the fifth service network set and the sixth service network set, and the plurality of first service networks belong to the fifth service network set and all Describe the intersection of the sixth service network set.
The method according to claim 8, wherein before the first network element determines a plurality of first service networks, the method further comprises:

The first network element receives measurement report information of the terminal device, where the measurement report information includes the fourth information.
The method according to claim 8 or 9, wherein the fourth information is further used to indicate a priority corresponding to each service network among multiple service networks accessible to the terminal device, and the multiple service networks can be accessed by the terminal device. a service network includes the plurality of first service networks, and

The first network element determining the priority corresponding to each of the first service networks includes:

The first network element determines, according to the fourth information, a priority corresponding to each of the first service networks.
The method according to any one of claims 1 to 10, wherein the first preset condition includes that the serving network is reachable in the current time period and/or the network quality of the serving network satisfies the third preset condition.
The method according to any one of claims 1 to 11, wherein the first request information is further used to indicate a third service network set, and the third service network set includes accessible connections of the terminal device. into the service network.
The method according to any one of claims 1 to 12, wherein the second network element comprises a mobility management function network element corresponding to the current serving network of the terminal device, or

The second network element includes a wireless access network network element corresponding to the target service network.
A method for network handover, comprising:

The fourth network element determines a first service network set, where the first service network set includes accessible service networks of the terminal device, and the service networks in the first service network set satisfy a first preset condition, and the first service network set A preset condition is used to determine whether the serving network meets the handover requirement of the terminal device;

The fourth network element sends third information, where the third information is used to indicate the first service network set and the priority of each service network in the first service network set.
The method according to claim 14, wherein the first preset condition comprises that the serving network is reachable in the current time period and/or the network quality of the serving network satisfies the third preset condition.
The method according to claim 14 or 15, wherein before the fourth network element determines the first service network set, the method further comprises:

The fourth network element receives fifth information, where the fifth information is used to indicate an accessible service network of the terminal device; and

The fourth network element determining the first service network set includes:

The fourth network element determines the first service network set according to the fifth information and the first preset condition.
The method according to any one of claims 14 to 16, wherein before the fourth network element determines the first service network set, the method further comprises:

the fourth network element receives first request information, the first request information is used to request handover of the terminal device to the target serving cell, and

The first request information includes fifth information, where the fifth information is used to indicate an accessible service network of the terminal device.
The method according to any one of claims 14 to 17, wherein the fourth network element comprises a mobility management function network element corresponding to the current serving network of the terminal device, or

The fourth network element includes a mobility management function network element corresponding to the target service network, or

The fourth network element includes a radio access network network element corresponding to the target service network.
A device for network switching, comprising:

a processing unit, configured for the first network element to determine a plurality of first service networks and a priority corresponding to each of the first service networks;

The processing unit is further configured for the first network element to determine a target service network from the plurality of first service networks according to the priority corresponding to each of the first service networks;

A transceiver unit, used for the first network element to send first request information to the second network element, where the first request information is used to request handover of the terminal device to a target serving cell, where the target serving cell belongs to the target serving cell network.
The apparatus according to claim 19, wherein the processing unit is configured for the first network element to determine a plurality of first service networks comprising:

The processing unit is configured for the first network element to determine a first service network set, where the first service network set includes accessible service networks of the terminal device, and services in the first service network set The network satisfies a first preset condition, and the first preset condition is used to determine whether the serving network satisfies the handover requirement of the terminal device;

the processing unit, configured for the first network element to determine a second serving network set, where the signal quality of the serving cell corresponding to the serving network in the second serving network set satisfies a second preset condition;

the processing unit, configured for the first network element to determine the multiple first service networks according to the first service network set and the second service network set, where the multiple first service networks belong to the The intersection of the first set of service networks and the second set of service networks.
The apparatus according to claim 20, wherein the processing unit for the first network element to determine the first service network set comprises:

The processing unit is configured for the first network element to determine a third service network set according to the first information, where the third service network set includes accessible service networks of the terminal device, and the first information includes network selection policy information preconfigured by the terminal device;

The processing unit is used for the first network element to determine a fourth service network set according to the second information, where the service networks in the fourth service network set satisfy a first preset condition, and the first preset condition is used for Determine whether the serving network meets the handover requirement of the terminal device, and the second information includes the network configuration information of the first network element;

the processing unit, configured for the first network element to determine the first service network set according to the third service network set and the fourth service network set, where the first service network set belongs to the third service network set The intersection of the set of service networks and the fourth set of service networks.
The apparatus of claim 20, wherein:

The transceiver unit is further configured for the first network element to receive third information, where the third information is used to indicate the first service network set; and

The processing unit for the first network element to determine the first service network set includes:

The processing unit is configured for the first network element to determine the first service network set according to the third information.
The apparatus according to claim 22, wherein the transceiver unit is further configured to receive, by the first network element, first response information for the first request information, where the first response information is used to indicate the Whether the terminal device is successfully handed over to the target serving cell, the first response information includes the third information.
The device according to any one of claims 19 to 23, characterized in that,

The transceiver unit is further configured for the first network element to obtain first information from a third network element, where the first information is used to indicate that each service network corresponds to a plurality of service networks accessible to the terminal device. , the plurality of service networks includes the plurality of first service networks; and

The processing unit for the first network element to determine the priority corresponding to each of the first service networks includes:

The processing unit is configured for the first network element to determine, according to the first information, a priority corresponding to each of the first service networks.
The apparatus according to claim 24, wherein the third network element comprises a mobility management function network element corresponding to the current serving network of the terminal device, or

The third network element includes a wireless access network network element corresponding to the historical service network of the terminal device.
The apparatus according to claim 19, wherein before the processing unit is used by the first network element to determine a plurality of first service networks,

The transceiver unit is further configured for the first network element to receive fourth information, where the fourth information is used to indicate a fifth service network set, and the fifth service network set includes accessible a serving network, and the signal quality of the serving cell corresponding to the serving network in the fifth serving network set satisfies the second preset condition; and

The processing unit for the first network element to determine a plurality of first service networks includes:

the processing unit, configured for the first network element to determine the fifth service network set according to the fourth information;

The processing unit is further configured for the first network element to determine a sixth service network set according to the second information, the service networks in the sixth service network set meet the first preset condition, and the first preset condition uses For determining whether the serving network meets the handover requirement of the terminal device, the second information includes network configuration information of the first network element;

The processing unit is further configured for the first network element to determine the multiple first service networks according to the fifth service network set and the sixth service network set, where the multiple first service networks belong to the The intersection of the fifth service network set and the sixth service network set.
The apparatus according to claim 26, wherein before the transceiver unit is used for the first network element to determine a plurality of first service networks, the transceiver unit is further configured to receive the received data by the first network element. and the measurement report information of the terminal device, where the measurement report information includes the fourth information.
The apparatus according to claim 26 or 27, wherein the fourth information is further used to indicate a priority corresponding to each service network among multiple service networks accessible to the terminal device, and the multiple service networks can be accessed by the terminal device. a service network includes the plurality of first service networks, and

The processing unit for the first network element to determine the priority corresponding to each of the first service networks includes:

The processing unit is configured for the first network element to determine, according to the fourth information, a priority corresponding to each of the first service networks.
The apparatus according to any one of claims 19 to 28, wherein the first preset condition includes that the serving network is reachable in the current time period and/or the network quality of the serving network satisfies the third preset condition.
The apparatus according to any one of claims 19 to 29, wherein the first request information is further used to indicate a third service network set, and the third service network set includes accessible connections of the terminal device. into the service network.
The apparatus according to any one of claims 19 to 30, wherein the second network element comprises a mobility management function network element corresponding to the current serving network of the terminal device, or

The second network element includes a radio access network network element corresponding to the target service network.
A device for network switching, comprising:

A processing unit, configured for the fourth network element to determine a first service network set, where the first service network set includes accessible service networks of the terminal device, and the service networks in the first service network set satisfy a first preset condition, the first preset condition is used to determine whether the serving network meets the handover requirement of the terminal device;

A transceiver unit, configured for the fourth network element to send third information, where the third information is used to indicate the first service network set and the priority of each service network in the first service network set.
The apparatus according to claim 32, wherein the first preset condition comprises that the serving network is reachable in the current time period and/or the network quality of the serving network satisfies the third preset condition.
The apparatus according to claim 32 or 33, wherein before the processing unit is used by the fourth network element to determine the first service network set, the transceiver unit is further used for the fourth network element to receive fifth information, where the fifth information is used to indicate an accessible service network of the terminal device; and

The processing unit for the fourth network element to determine the first service network set includes:

The processing unit is configured for the fourth network element to determine the first service network set according to the fifth information and the first preset condition.
The apparatus according to any one of claims 32 to 34, wherein before the processing unit is used for the fourth network element to determine the first service network set, the transceiver unit is further used for the first service network set. Four network elements receive first request information, the first request information is used to request handover of the terminal device to the target serving cell, and

The first request information includes fifth information, where the fifth information is used to indicate an accessible service network of the terminal device.
The apparatus according to any one of claims 32 to 35, wherein the fourth network element comprises a mobility management function network element corresponding to the current serving network of the terminal device, or

The fourth network element includes a mobility management function network element corresponding to the target service network, or

The fourth network element includes a radio access network network element corresponding to the target service network.
A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed, the device is made to execute the method according to any one of claims 1 to 13 , or, causing an apparatus to perform a method as claimed in any one of claims 14 to 18 .
A computer program product, characterized in that it includes a computer program that, when the computer program is run on a computer, causes the computer to execute the method according to any one of claims 1 to 13, or causes the computer to execute the method according to any one of claims 1 to 13 The computer performs the method of any one of claims 14 to 18.
A chip system, characterized by comprising: a processor for calling and running a computer program from a memory, so that a communication device installed with the chip system executes the method according to any one of claims 1 to 13 ; or, causing the communication device on which the chip system is installed to execute the method according to any one of claims 14 to 18 .
A chip, characterized in that it comprises: a processor and a communication interface, the communication interface is used for communicating with an external device or an internal device, and the processor is used for executing the method according to any one of claims 1 to 13 The method, alternatively, the processor is adapted to perform the method of any one of claims 14 to 18.
The chip according to claim 40, wherein the chip further comprises a memory, the memory stores an instruction, the processor is configured to execute the instruction stored in the memory, and when the instruction is executed, the The processor performs the method as claimed in any one of claims 1 to 13, or performs the method as claimed in any one of claims 14 to 18.
A communication device, characterized in that it includes:

memory for storing computer programs;

A processor for executing a computer program stored in the memory, so that the communication device executes the communication method according to any one of claims 1 to 13, or causes the communication device to execute claims 14 to 18 The communication method described in any one of.
A communication system, characterized by comprising the device according to any one of claims 19 to 31 and the device according to any one of claims 32 to 36 .