WO2023160199A1

WO2023160199A1 - Method and apparatus for accessing communication network

Info

Publication number: WO2023160199A1
Application number: PCT/CN2022/141502
Authority: WO
Inventors: 李文正; 朱强华; 吴问付
Original assignee: 华为技术有限公司
Priority date: 2022-02-28
Filing date: 2022-12-23
Publication date: 2023-08-31
Also published as: CN116709467A

Abstract

Provided in the present application are a method and apparatus for accessing a communication network. The method comprises: a first mobility management function (AMF) receiving first information which is sent by a terminal device, wherein the first information is used for indicating a first service which is requested by the terminal device; the first AMF determining first indication information according to the first service which is requested by the terminal device, a second service which is supported by a network of a place of visit, and a third service which is supported by a home network, wherein the first indication information is used for indicating that the PDU session establishment of the terminal device succeeds or fails; and the first AMF sending the first indication information to the terminal device, wherein the first AMF belongs to the network of the place of visit. By means of the present application, a terminal device can simultaneously use a service which is supported by a network of a place of visit and a service which is supported by a home network, thereby guaranteeing the service requirements of the terminal device.

Description

A method and device for accessing a communication network

This application claims the priority of the Chinese patent application with the application number 202210191759.7 and the application title "A Method and Device for Accessing a Communication Network" filed with the China Patent Office on February 28, 2022, the entire contents of which are hereby incorporated by reference In this application.

technical field

The embodiments of the present application relate to the communication field, and, more specifically, relate to a method and an apparatus for accessing a communication network.

Background technique

Non-public network (non-public network, NPN) is a kind of non-public 5G network, which can rely on the network function of public land mobile network (PLMN), such as public network integrated NPN (public network integrated NPN) , PNI-NPN), and can also be realized without relying on the network function of PLMN, such as independently deploying NPN (standalone NPN, SNPN).

The SNPN network is independently deployed and does not depend on the PLMN network. The SNPN network is identified by a PLMN identifier (PLMN ID) and a network identifier (NID). In the SNPN network, its cell broadcasts the PLMN ID and NID, and the UE selects the SNPN network according to the broadcast information.

In the coverage area of some specific PLMN networks and NPN networks (such as stadiums, concerts, parks), the service network operator in this area will provide user equipment (user equipment, UE) with specific service subscription information according to the needs of business scenarios ) provides specific services (in specific scenarios, such as stadiums, concerts, and services provided in parks). When a UE with subscription information for a specific service enters the coverage area of the service network, it needs to discover and choose to access the service network that provides the specific service to obtain the network service of the specific service.

Contents of the invention

The embodiment of the present application provides a method for accessing a communication network, which can guarantee service requirements of a terminal device.

In a first aspect, a method for accessing a communication network is provided. The method includes: the first mobile management network element AMF receives first information sent by the terminal device, the first information is used to indicate the first service requested by the terminal device; the first AMF, according to the first service requested by the terminal device, The second service supported by the visited network and the third service supported by the home network determine first indication information, where the first indication information is used to indicate whether the protocol data unit PDU session of the terminal device is established successfully or failed; the first AMF sends The terminal device sends the first indication information, where the first AMF belongs to the visited network.

Based on the above solution, the first AMF receives the first information initiated by the terminal device, where the first information is used to indicate the first service requested by the terminal device, and the first AMF receives the first information based on the second service supported by the visited network and the home network The supported third service and the first service requested by the terminal device determine the first indication information, the first AMF sends the determined first indication information to the terminal device, and the terminal device determines whether the establishment of the PDU session is successful or failed according to the first indication information . Taking the first service requested by the terminal device as an example belonging to the second service supported by the first access network device, the terminal device sends first information to the first AMF, and the first information is used to indicate the first service requested by the terminal device. An AMF judges according to the first information and the second service supported by the visited network, and sends first indication information to the terminal device, where the first indication information indicates that the PDU session of the terminal device is established successfully. When the first service requested by the terminal device does not belong to the second service supported by the visited network, but the first service belongs to the third service supported by the home network, the first indication information indicates that the PDU session of the terminal device is successfully established, and the terminal device passes The visited network establishes an HR session, and then selects the home network to fulfill the service requirements of subsequent terminal devices. The first AMF judges the service requested by the terminal device through the services supported by the visited network and the service supported by the home network, ensuring that the terminal device can also access services supported by the visited network at the same time in some specific service networks and services supported by the home network to ensure the service requirements of terminal equipment.

With reference to the first aspect, in some implementation manners of the first aspect, the first AMF receives session establishment request information sent by the terminal device, where the session establishment request information includes the first service requested by the terminal device.

Based on the above solution, the terminal device sends the session request information to the first AMF to carry the first service information requested by the terminal device, so as to ensure that the terminal device selects an appropriate access mode to access the network device and meet the service requirements of the terminal device.

With reference to the first aspect, in some implementation manners of the first aspect, the first AMF sends query service request information to the second AMF and/or the first AMF sends query service request information to the data management network element UDM, and the query The service request information is used to query the third service supported by the home network, where the second AMF and the UDM belong to the home network.

Based on the above solution, the first AMF queries the third service supported by the home network, the second AMF and/or UDM sends the third service supported by the home network to the first AMF according to the request of the first AMF, and the first AMF sends the third service supported by the home network to the first AMF according to the The first service, the second service and the third service are determined as the first indication information sent by the terminal device, which can guarantee the service requirements of the terminal device.

With reference to the first aspect, in some implementation manners of the first aspect, before the first AMF sends the inquiry service request information, the method further includes: the first AMF receives the first registration request information from the terminal device, the The first registration request information is used to request access to the visited network.

With reference to the first aspect, in some implementation manners of the first aspect, the first AMF receives the service response information sent by the second AMF and/or the first AMF receives the service response information sent by the UDM, where the service The response information includes the third service supported by the home network.

With reference to the first aspect, in some implementation manners of the first aspect, the first AMF sends first indication information to the terminal device, where the first indication information is used to indicate that the PDU session of the terminal device is successfully established.

With reference to the first aspect, in some implementations of the first aspect, the requested first service belongs to the second service and does not belong to the third service, and the PDU session is managed by the session management function SMF in the visited network. Established, the PDU session type is local breakthrough LBO roaming; or, the requested first service belongs to the third service and does not belong to the second service, the PDU session is established by the SMF in the home network, and the PDU session The type is home routing HR roaming; or, the requested first service belongs to the second service and the third service, and the PDU session is established by the SMF in the visited network and/or the SMF in the home network, the The PDU session type is the LBO and/or the HR.

Based on the above solution, the relationship between the first service requested by the terminal device and the second service supported by the visited network and the third service supported by the home network determines whether the PDU session of the terminal device is performed by the SMF of the visited network or the home network. The SMF of the network is established to ensure the service requirements of the terminal equipment.

In a second aspect, a method for accessing a communication network is provided. The method includes: a second mobility management network element AMF receiving second registration request information of a terminal device, the second registration request information including the third registration information supported by the home network. Service: the second AMF stores the third service locally in the second AMF according to the second registration request information, where the second AMF belongs to the home network.

Based on the above solution, according to the second registration request information of the terminal device, the second AMF stores the third service supported by the home network locally in the second AMF, and the first AMF of the visited network queries the third service supported by the home network. In the case of three services, the first AMF initiates a query of service request information to the second AMF, and the second AMF sends the locally stored third service to the first AMF.

With reference to the second aspect, in some implementation manners of the second aspect, the second AMF receives the query service request information sent by the first mobility management network element AMF, and the query service request information is used to query the second AMF supported by the home network. Three services: the second AMF sends service response information to the first AMF, where the service response information includes a third service supported by the home network, where the first AMF belongs to the visited network.

In a third aspect, a method for accessing a communication network is provided, the method including: a data management network element UDM receiving second registration request information of a terminal device, where the second registration request information includes a third service supported by a home network; The UDM stores the third service locally in the UDM according to the second registration request information, wherein the UDM belongs to the home network.

Based on the above solution, the UDM stores the third service supported by the home network locally in the UDM according to the second registration request information of the terminal device, and when the first AMF of the visited network queries the third service supported by the home network, the first The AMF initiates a query service request information to the UDM, and the UDM sends the locally stored third service to the first AMF.

With reference to the third aspect, in some implementation manners of the third aspect, the UDM receives query service request information sent by the first AMF, where the query service request information is used to query the third service supported by the home network; the UDM sends The first AMF sends service response information, where the service response information includes the third service supported by the home network, where the first AMF belongs to the visited network.

In a fourth aspect, a method for accessing a communication network is provided, the method comprising: a terminal device sends second registration request information to a second mobility management network element, where the second registration request information includes a third service supported by a home network , and/or, the terminal device sends the second registration request information to a data management network element, where the second mobility management network element and the data management network element belong to the home network.

With reference to the fourth aspect, in some implementation manners of the fourth aspect, the method further includes: the terminal device sends first information to the first mobility management network element AMF, where the first information is used to indicate the first information requested by the terminal device. A service: the terminal device receives first indication information from the first AMF, where the first indication information is used to indicate whether the protocol data unit PDU session of the terminal device is established successfully or fails, and the first indication information is consistent with the requested first One service, the second service supported by the visited network, and the third service supported by the home network are related; wherein, the first AMF belongs to the visited network, and the PDU session is controlled by the session management function SMF network element in the visited network And/or the SMF network element in the home network is established.

With reference to the fourth aspect, in some implementation manners of the fourth aspect, the terminal device sends session establishment request information to the first AMF, where the session establishment request information includes service information of the requested first service.

With reference to the fourth aspect, in some implementation manners of the fourth aspect, the terminal device receives first indication information from the first mobility management network element AMF, where the first indication information is used to indicate that the terminal device PDU session is successfully established .

With reference to the fourth aspect, in some implementations of the fourth aspect, the requested first service belongs to the second service and does not belong to the third service, the PDU session is established by the SMF in the visited network, the The PDU session type is LBO; or, the requested first service belongs to the third service and does not belong to the second service, the PDU session is established by the SMF in the home network, and the PDU session type is HR; or, The requested first service belongs to the second service and the third service, the PDU session is established by the SMF in the visited network and/or the SMF in the home network, and the PDU session type is LBO and/or HR .

With reference to the fourth aspect, in some implementation manners of the fourth aspect, the terminal device sends first registration request information to the first AMF, where the first registration request information is used to request access to the visited network.

According to a fifth aspect, a method for accessing a communication network is provided, the method comprising: a terminal device receives broadcast information from a first access network device, where the broadcast information includes capability information and access assistance information; the terminal device receives broadcast information according to the The broadcast information determines the access method of the access network device, and the access method includes: the terminal device accesses the visited network, or the terminal device accesses the second network through the first network, or the terminal device accesses the second network through the second network Access to the first network, wherein the first access network device belongs to the visited network, the first network is the visited network, and the second network is the home network or is different from the visited network and the home network The third network of the ground network.

Based on the above solution, the terminal device receives broadcast information from the first access network device, where the broadcast information includes capability information and access assistance information, and the capability information is used to indicate the second service supported by the visited network and/or Only the second service supported, the access assistance information is used to indicate that the terminal device accesses the second network through the first network or accesses the first network through the second network, where the first network is the access destination network, the second network is the home network or a third network different from the visited network and the home network, and the terminal device selects an appropriate way to access through the access assistance information and capability information in the broadcast information The network equipment ensures that the terminal equipment can also access the services supported by the visited network and the services supported by the home network at the same time in some specific service networks, so as to meet the service requirements of the terminal equipment.

With reference to the fifth aspect, in some implementation manners of the fifth aspect, the terminal device sends a third registration request message to a third access network device, where the third registration request message is used to request access to the second network, or, The third registration request message is used to request access to the first network, where the third network access device belongs to the first network or the second network.

With reference to the fifth aspect, in some implementation manners of the fifth aspect, the terminal device accessing the visited network includes: the terminal device sending first registration request information to the first mobility management network element AMF, and the first registration The request information is used to access the visited network, where the first AMF belongs to the visited network.

With reference to the fifth aspect, in some implementation manners of the fifth aspect, the terminal device receives a registration completion message from the first AMF, the registration completion message includes second information, and the second information includes updated capability information and/or updated access assistance information; the terminal device determines whether to update the access mode according to the second information.

With reference to the fifth aspect, in some implementations of the fifth aspect, the capability indication information includes at least one of the following: supportable service identifiers, supportable service category identifiers, service provider identifiers, data network DNN information, network slice.

With reference to the fifth aspect, in some implementation manners of the fifth aspect, the access assistance information includes at least one of the following: a network identifier of the first network, a network identifier of the second network, address information, and a network identifier of the first network The network identifier of the N3IWF of the device, the network identifier of the N3IWF of the second network device, the auxiliary information required by the first network, and the required auxiliary information of the second network.

In a sixth aspect, a method for accessing a communication network is provided, the method comprising: a first access network device determines broadcast information; the first access network device sends the broadcast information to a terminal device, and the broadcast information includes capability information and access assistance information, the capability information is used to indicate the second service supported by the visited network and/or only the second service supported, the access assistance information is used to indicate that the terminal device accesses the second network through the first network Or access the first network through the second network, wherein the first network is the visited network, and the second network is the home network or a third network different from the visited network and the home network .

Based on the above solution, the first access network device determines the broadcast information, which includes capability information and access assistance information. After receiving the broadcast information of the first access network device, the terminal device performs The information determines the way to access the network to meet the service requirements of the terminal equipment.

With reference to the sixth aspect, in some implementation manners of the sixth aspect, the access assistance information includes at least one of the following: a network identifier of the first network, a network identifier of the second network, address information, and a network identifier of the first network The network identifier of the N3IWF of the device, the network identifier of the N3IWF of the second network device, the auxiliary information required by the first network, and the required auxiliary information of the second network.

In a seventh aspect, a method for accessing a communication network is provided, the method including: a first mobility management network element AMF receiving first registration request information sent by a terminal device, the first registration request information being used by the terminal device to request registration A visited network: the first AMF sends registration completion information to the terminal device, where the registration completion information includes capability information and/or access assistance information, where the first AMF belongs to the visited network.

With reference to the seventh aspect, in some implementation manners of the seventh aspect, the registration completion information further includes updated capability information and/or updated access assistance information.

With reference to the sixth aspect, in some implementation manners of the sixth aspect, the first AMF sends first request information to the first policy control network element PCF, where the first request information is used to obtain capability information and access assistance information; The first AMF receives first response information from the first PCF, where the first response information includes the capability information and the access assistance information, where the first PCF belongs to the visited network.

With reference to the seventh aspect, in some implementation manners of the seventh aspect, the first AMF receiving the first response information from the first PCF includes: the first PCF receiving third information sent from the second PCF, the The third information includes updated capability information and/or access assistance information; the first PCF sends the first response information to the first AMF, and the first response information also includes the updated capability information and/or access assistance information; Enter auxiliary information. Wherein, the second PCF belongs to the home network.

In conjunction with the seventh aspect, in some implementations of the seventh aspect, the capability indication information is at least one of the following: supportable service identifier, supportable service category identifier, service provider identifier, data network DNN information, network slice .

With reference to the seventh aspect, in some implementation manners of the seventh aspect, the access assistance information includes at least one of the following: a network identifier of the first network, a network identifier of the second network, address information, and a network identifier of the first network The network identifier of the N3IWF of the device, the network identifier of the N3IWF of the second network device, the auxiliary information required by the first network, and the required auxiliary information of the second network.

In an eighth aspect, a communication device is provided, and the device is configured to execute the method in any possible implementation manner of the foregoing first aspect to the sixth aspect. Specifically, the apparatus may include a unit and/or module, such as a processing unit and/or a communication unit, for performing the method in any possible implementation manner of the first aspect to the sixth aspect.

In an implementation manner, the apparatus is a network device (such as a control plane device, such as a mobility management network element, such as a session management network element). When the device is a network device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In another implementation manner, the apparatus is a chip, a chip system or a circuit for network equipment (such as control plane equipment, such as a mobility management network element, such as a session management network element). When the device is a chip, chip system or circuit for network equipment, the communication unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, chip system or circuit, etc. ; The processing unit may be at least one processor, processing circuit or logic circuit, etc.

In a ninth aspect, there is provided a communication device, which includes: at least one processor configured to execute a computer program or instruction stored in a memory, so as to execute the method in any possible implementation manner of the first aspect to the third aspect above. Optionally, the apparatus further includes a memory for storing computer programs or instructions. Optionally, the device further includes a communication interface, through which the processor reads the computer program or instructions stored in the memory.

In an implementation manner, the apparatus is a network device (such as a control plane device, such as a mobility management network element, such as a session management network element).

In another implementation manner, the apparatus is a chip, a chip system or a circuit for network equipment (such as control plane equipment, such as a mobility management network element, such as a session management network element).

In a tenth aspect, the present application provides a communication device, which includes: a transceiver unit receiving first information sent by a terminal device, where the first information is used to indicate the first service requested by the terminal device; a processing unit according to the terminal device request The first service, the second service supported by the visited network, and the third service supported by the home network determine first indication information, where the first indication information is used to indicate the success or failure of the protocol data unit PDU session establishment of the terminal device; The transceiving unit sends the first indication information to the terminal device, where the first AMF belongs to the visited network.

With reference to the tenth aspect, in some implementation manners of the tenth aspect, the transceiving unit receives session establishment request information sent by the terminal device, where the session establishment request information includes the first service requested by the terminal device.

With reference to the tenth aspect, in some implementation manners of the tenth aspect, the transceiver unit sends query service request information to the second AMF and/or the transceiver unit sends query service request information to the data management network element UDM, and the query service request The information is used to query the third service supported by the home network, where the second AMF and the UDM belong to the home network.

With reference to the tenth aspect, in some implementation manners of the tenth aspect, before the transceiving unit sends the inquiry service request information, the method further includes: the transceiving unit receives first registration request information from the terminal device, and the first The registration request information is used to request access to the visited network.

With reference to the tenth aspect, in some implementation manners of the tenth aspect, the transceiver unit receives the service response information sent by the second AMF and/or the transceiver unit receives the service response information sent by the UDM, where the service response information Including the third service supported by the home network.

With reference to the tenth aspect, in some implementation manners of the tenth aspect, the transceiving unit sends first indication information to the terminal device, where the first indication information is used to indicate that the PDU session of the terminal device is successfully established.

With reference to the tenth aspect, in some implementation manners of the tenth aspect, the requested first service belongs to the second service and does not belong to the third service, and the PDU session is managed by the session management function SMF in the visited network. Established, the PDU session type is local breakthrough LBO roaming; or, the requested first service belongs to the third service and does not belong to the second service, the PDU session is established by the SMF in the home network, and the PDU session The type is home routing HR roaming; or, the requested first service belongs to the second service and the third service, and the PDU session is established by the SMF in the visited network and/or the SMF in the home network, the The PDU session type is the LBO and/or the HR.

In an eleventh aspect, an apparatus for accessing a communication network is provided, the apparatus comprising: a transceiver unit receiving second registration request information of a terminal device, where the second registration request information is used to instruct the processing unit to store the first registration information supported by the home network. Three services: the processing unit stores the third service locally in the transceiver unit according to the second registration request information, wherein the transceiver unit and the processing unit belong to the home network.

With reference to the eleventh aspect, in some implementation manners of the eleventh aspect, the transceiver unit receives query service request information sent by the first mobility management network element AMF, where the query service request information is used to query the service supported by the home network. The third service: the transceiving unit sends service response information to the first AMF, where the service response information includes the third service supported by the home network, where the first AMF belongs to the visited network.

In a twelfth aspect, there is provided an apparatus for accessing a communication network, the apparatus comprising: a transceiver unit receiving second registration request information of a terminal device, the second registration request information instructing the processing unit to store the third service supported by the home network ; The processing unit stores the third service locally in the processing unit according to the second registration request information, wherein the transceiver unit and the processing unit belong to the home network.

With reference to the twelfth aspect, in some implementation manners of the twelfth aspect, the transceiver unit receives query service request information sent by the first AMF, where the query service request information is used to query the third service supported by the home network; The transceiver unit sends service response information to the first AMF, where the service response information includes the third service supported by the home network, where the first AMF belongs to the visited network.

In a thirteenth aspect, an apparatus for accessing a communication network is provided, which includes: a transceiver unit receiving broadcast information from a first access network device, where the broadcast information includes capability information and access assistance information; and a processing unit according to the The broadcast information determines the access method of the access network device, and the access method includes: the terminal device accesses the visited network, or the terminal device accesses the second network through the first network, or the terminal device accesses the second network through the second network Access to the first network, wherein the first access network device belongs to the visited network, the first network is the visited network, and the second network is the home network or is different from the visited network and the home network The third network of the ground network.

With reference to the thirteenth aspect, in some implementation manners of the thirteenth aspect, the transceiver unit sends a third registration request message to a third access network device, where the third registration request message is used to request access to the second network, Alternatively, the third registration request message is used to request access to the first network, where the third access network device belongs to the first network or the second network.

With reference to the thirteenth aspect, in some implementation manners of the thirteenth aspect, the accessing the visited network by the transceiver unit includes: the transceiver unit sends first registration request information to the first mobility management network element AMF, and the first A registration request message is used to access the visited network, where the first AMF belongs to the visited network.

With reference to the thirteenth aspect, in some implementation manners of the thirteenth aspect, the transceiver unit receives a registration completion message from the first AMF, the registration completion message includes second information, and the second information includes an updated Capability information and/or updated access assistance information; the processing unit determines whether to update the access mode according to the second information.

With reference to the thirteenth aspect, in some implementations of the thirteenth aspect, the capability indication information includes at least one of the following: supportable service identifiers, supportable service category identifiers, service provider identifiers, and data network DNN information , Network slicing.

With reference to the thirteenth aspect, in some implementation manners of the thirteenth aspect, the access assistance information includes at least one of the following: a network identifier of the first network, a network identifier of the second network, address information, the first A network identifier of the N3IWF of a network device, a network identifier of the N3IWF of the second network device, auxiliary information required by the first network, and auxiliary information required by the second network.

A fourteenth aspect provides an apparatus for accessing a communication network, which includes: a processing unit determines broadcast information; a transceiver unit sends the broadcast information to a terminal device, the broadcast information includes capability information and access assistance information, and the capability The information is used to indicate the second service supported by the visited network and/or only the second service supported, and the access assistance information is used to indicate that the terminal device accesses the second network through the first network or accesses the second network through the second network. The first network, wherein the first network is the visited network, and the second network is the home network or a third network different from the visited network and the home network.

With reference to the fourteenth aspect, in some implementations of the fourteenth aspect, the capability indication information includes at least one of the following: supportable service identifiers, supportable service category identifiers, service provider identifiers, and data network DNN information , Network slicing.

With reference to the fourteenth aspect, in some implementation manners of the fourteenth aspect, the access assistance information includes at least one of the following: a network identifier of the first network, a network identifier of the second network, address information, the first A network identifier of the N3IWF of a network device, a network identifier of the N3IWF of the second network device, auxiliary information required by the first network, and auxiliary information required by the second network.

In a fifteenth aspect, there is provided an apparatus for accessing a communication network, the apparatus comprising: a transceiver unit receiving first registration request information sent by a terminal device, where the first registration request information is used for a network that the terminal device requests to register and visit; The transceiving unit sends registration completion information to the terminal device, where the registration completion information includes capability information and/or access assistance information, wherein the transceiving unit belongs to the visited network.

With reference to the fifteenth aspect, in some implementation manners of the fifteenth aspect, the registration completion information further includes updated capability information and/or updated access assistance information.

With reference to the fifteenth aspect, in some implementation manners of the fifteenth aspect, the transceiver unit sends first request information to the first policy control network element PCF, where the first request information is used to obtain capability information and access assistance information The transceiving unit receives first response information from the first PCF, where the first response information includes the capability information and the access assistance information, where the first PCF belongs to the visited network.

With reference to the fifteenth aspect, in some implementation manners of the fifteenth aspect, the receiving the first response information from the first PCF by the transceiver unit includes: receiving, by the transceiver unit, third information sent from the second PCF, the The third information includes updated capability information and/or access assistance information; the first PCF sends the first response information to the transceiver unit, and the first response information also includes the updated capability information and/or access assistance information. Supplementary information. Wherein, the second PCF belongs to the home network.

With reference to the fifteenth aspect, in some implementations of the fifteenth aspect, the capability indication information is at least one of the following: supportable service identifiers, supportable service category identifiers, service provider identifiers, data network DNN information, Network slicing.

With reference to the fifteenth aspect, in some implementation manners of the fifteenth aspect, the access assistance information includes at least one of the following: a network identifier of the first network, a network identifier of the second network, address information, the first A network identifier of the N3IWF of a network device, a network identifier of the N3IWF of the second network device, auxiliary information required by the first network, and auxiliary information required by the second network.

In a sixteenth aspect, a computer-readable storage medium is provided, the computer-readable medium stores program code for execution by a device, and the program code includes any one of the possible implementation manners for executing the first aspect to the seventh aspect above Methods.

In a seventeenth aspect, a computer program product including instructions is provided, and when the computer program product is run on a computer, the computer is made to execute the method in any possible implementation manner of the first aspect to the seventh aspect above.

In an eighteenth aspect, a communication system is provided, and the communication system includes one or more of the above-mentioned first mobility management network element, second mobility management network element, and data management network element.

In a nineteenth aspect, a communication system is provided, and the communication system includes one or more of the foregoing first mobility management network element, first access network device, and terminal device.

Description of drawings

Fig. 1 shows an architecture diagram of a 5G mobile communication system applicable to the embodiment of the present application.

Fig. 2 shows a schematic diagram of a system architecture tried in this application.

Fig. 3 shows a schematic diagram of a non-public network applied to the embodiment of the present application.

Fig. 4 shows a schematic diagram of a system architecture applicable to this application.

Fig. 5 shows a schematic diagram of another system architecture applicable to the present application.

Fig. 6 shows a schematic flowchart of a method for accessing a communication network provided by an embodiment of the present application.

FIG. 7 shows a schematic flowchart of another method for accessing a communication network provided by an embodiment of the present application.

FIG. 8 shows a schematic flowchart of another method for accessing a communication network provided by an embodiment of the present application.

FIG. 9 shows a schematic flowchart of another method for accessing a communication network provided by an embodiment of the present application.

FIG. 10 shows a schematic flowchart of another method for accessing a communication network provided by an embodiment of the present application.

Fig. 11 shows a schematic block diagram of an apparatus for accessing a communication network provided by an embodiment of the present application.

Fig. 12 shows a schematic block diagram of another apparatus for accessing a communication network device provided by an embodiment of the present application.

FIG. 13 shows a schematic diagram of a chip system provided by an embodiment of the present application.

Detailed ways

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

Figure 1 shows a 5G mobile communication system architecture diagram. As shown in the figure, the 5G mobile communication system architecture consists of a (wireless) access network (radio access network, (R) AN), a core network (Core) and a data network (data network, DN). Among them, UE, AN, and Core are the main components of the architecture. Logically, they can be divided into two parts: the user plane and the control plane. The control plane is responsible for the management of the mobile network, and the user plane is responsible for the transmission of business data. In the figure, the NG2 reference point is located between the AN control plane and the Core control plane, the NG3 reference point is located between the AN user plane and the Core user plane, and the NG6 reference point is located between the Core user plane and the data network.

UE: It is the entrance for mobile users to interact with the network. It can provide basic computing capabilities and storage capabilities, display service windows to users, and accept user operation inputs. The UE will use the new air interface technology to establish a signal connection and a data connection with the AN, thereby transmitting control signals and service data to the mobile network.

AN: Similar to the base station in the traditional network, it is deployed close to the UE to provide network access functions for authorized users in a specific area, and can use transmission tunnels of different qualities to transmit user data according to user levels and service requirements. AN can manage its own resources, use them reasonably, provide access services for UEs as needed, and forward control signals and user data between UEs and the core network.

Core: 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. Provide network access authentication for the UE when the UE is attached; allocate network resources for the UE when the UE has a service request; update network resources for the UE when the UE is moving; provide a fast recovery mechanism for the UE when the UE is idle ; When the UE is deattached, release network resources for the UE; when the UE has business data, provide data routing functions for the UE, such as forwarding uplink data to the DN; or receive UE downlink data from the DN, forward it to the AN, and send to UE.

DN: It is a data network that provides business services for users. 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 not controlled by the operator, such as the Internet, or a proprietary network jointly deployed by the operator, such as for the configuration of the IP multimedia core network subsystem (IP multimedia core network subsystem, IMS) service.

Figure 2 is the detailed architecture determined on the basis of Figure 1, in which the control plane of the core network adopts a service-oriented architecture, and the interaction between network elements on the control plane adopts the method of service invocation. The control plane network element opens the service for other control plane network elements to call. Each part involved in the network architecture shown in Figure 2 is described below:

1. User equipment (user equipment, terminal) 210: may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems, as well as various forms of terminals, Mobile station (mobile station, MS), terminal (terminal) or soft terminal, etc. For example, water meters, electricity meters, sensors, etc.

Exemplarily, the user equipment in this embodiment of the present application may refer to an access terminal, a subscriber unit, a user station, a mobile station, a mobile station, a relay station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal ( terminal equipment), wireless communication equipment, user agent or user device. The user equipment can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, user equipment in 5G networks or users in future evolved public land mobile networks (PLMN) Devices or user equipment in the future Internet of Vehicles, etc., are not limited in this embodiment of the present application.

As an example and not a limitation, in this embodiment of the application, wearable devices can also be referred to as wearable smart devices, which is a general term for intelligently designing daily wear and developing wearable devices by applying wearable technology, such as glasses, Gloves, watches, clothing and shoes, etc. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction. Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, and need to cooperate with other devices such as smart phones Use, such as various smart bracelets and smart jewelry for physical sign monitoring.

In addition, in the embodiment of the present application, the user equipment can also be the user equipment in the Internet of Things (Internet of Things, IoT) system. IoT is an important part of the development of information technology in the future, and its main technical feature is that items can be Connect with the network to realize the intelligent network of man-machine interconnection and object interconnection. In the embodiment of the present application, the IOT technology can achieve massive connections, deep coverage, and terminal power saving through, for example, narrow band (NB) technology. In addition, in this embodiment of the application, the user equipment may also include sensors such as smart printers, train detectors, and gas stations, and its main functions include collecting data (part of user equipment), receiving control information and downlink data of access network equipment, and Send electromagnetic waves to transmit uplink data to access network equipment.

2. (wireless) access network equipment (radio access network, (R)AN) 220: used to provide network access functions for authorized user equipment in a specific area, and can use different quality radios according to the level of user equipment and service requirements, etc. transport tunnel.

(R)AN can manage wireless resources, provide access services for user equipment, and then complete the forwarding of control signals and user equipment data between user equipment and the core network. (R)AN can also be understood as a base station in a traditional network.

Exemplarily, the access network device in the embodiment of the present application may be any communication device with a wireless transceiver function for communicating with the user equipment. The access network equipment includes but not limited to: evolved Node B (evolved Node B, eNB), radio network controller (radio network controller, RNC), Node B (Node B, NB), base station controller (base station controller) , BSC), base transceiver station (base transceiver station, BTS), home base station (home evolved NodeB, HeNB, or home Node B, HNB), baseband unit (baseBand unit, BBU), wireless fidelity (wireless fidelity, WIFI) The access point (access point, AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or transmission and reception point (transmission and reception point, TRP) in the system can also be 5G, For example, NR, gNB in the system, or, transmission point (TRP or TP), one or a group (including multiple antenna panels) antenna panels of the base station in the 5G system, or, it can also be a gNB or a transmission point A network node, such as a baseband unit (BBU), or a distributed unit (distributed unit, DU), etc.

In some deployments, a gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (AAU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, and realizing the functions of radio resource control (radio resource control, RRC) and packet data convergence protocol (packet data convergence protocol, PDCP) layer. The DU is responsible for processing physical layer protocols and real-time services, realizing the functions of the radio link control (radio link control, RLC) layer, media access control (media access control, MAC) layer and physical (physical, PHY) layer. The AAU implements some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by the DU , or, sent by DU+AAU. It can be understood that the access network device may be a device including one or more of a CU node, a DU node, and an AAU node. In addition, the CU can be divided into access network devices in the access network (radio access network, RAN), and the CU can also be divided into access network devices in the core network (core network, CN). Do limited.

3. User plane network element 230: used for packet routing and forwarding and quality of service (quality of service, QoS) processing of user plane data, etc.

In a 5G communication system, the user plane network element may be a user plane function (user plane function, UPF) network element. In the future communication system, the user plane network element may still be a UPF network element, or may have other names, which are not limited in this application.

4. Data network element 240: used to provide a network for transmitting data.

In a 5G communication system, the data network element may be a data network (data network, DN) network element. In the future communication system, the data network element may still be a DN network element, or may have other names, which are not limited in this application.

5. Authentication server 250: execute security authentication of the user. In a 5G communication system, the authentication server may be an authentication server function (authentication server function, AUSF).

6. Mobility management network element 260: mainly used for mobility management and access management. In a 5G communication system, the access management network element may be an access and mobility management function (access and mobility management function, AMF), which mainly performs functions such as mobility management and access authentication/authorization. In addition, it is also responsible for transmitting user policies between terminals and policy control function (policy control function, PCF) network elements.

7. Session management network element 270: mainly used for session management, Internet Protocol (IP) address allocation and management of user equipment, selection of manageable user plane functions, policy control and charging function interface endpoints and downlink Data Notification etc.

In the 5G communication system, the session management network element may be a session management function (session management function, SMF) network element, which completes terminal IP address allocation, UPF selection, and charging and QoS policy control.

8. Application network element 280: In the 5G communication system, the application network element may be an application function (application function, AF) network element, which represents the application function of a third party or an operator, and is an interface for the 5G network to obtain external application data. It is mainly used to transfer the requirements of the application side to the network side.

9. Unified data management network element 290: responsible for the management of user identification, subscription data, and authentication data, and the registration management of user service network elements. In a 5G communication system, the unified data management network element may be unified data management (unified data management, UDM).

10. Policy control network element 291: includes user subscription data management function, policy control function, charging policy control function, service quality (quality of service, QoS) control, etc., and is used to guide the unified policy framework of network behavior, which is the control plane Functional network elements (such as AMF, SMF network elements, etc.) provide policy rule information and the like.

In a 5G communication system, the policy control network element may be a PCF.

11. The network function storage base function network element 292: providing storage and selection functions of network function entity information for other core network elements. In a 5G communication system, the network element may be a network function repository function (network function repository function, NRF).

12. Network open network element 293: In the 5G communication system, the network open network element may be a network open function (network element function, NEF) network element, which is mainly used to expose the services and capabilities of the 3GPP network function to the AF, and also AF may be made to provide information to 3GPP network functions.

13. Network slice selection function network element 294: responsible for selecting a network slice for the UE. In the 5G communication system, the application network element may be a network slice selection function (network slice selection function, NSSF) network element.

In a future communication system, such as a 6G communication system, the above-mentioned network elements or devices may still use their names in the 5G communication system, or may have other names, which are not limited in this embodiment of the present application. The functions of the above-mentioned network element or device may be performed by an independent network element, or jointly performed by several network elements. In actual deployment, network elements in the core network can be deployed on the same or different physical devices. For example, as a possible deployment, the AMF and the SMF may be deployed on the same physical device. For another example, the network elements of the 5G core network can be deployed on the same physical device as the network elements of the 4G core network. This embodiment of the present application does not limit it.

In a 5G communication system, the application network element may be an application function (application function, AF) network element. In the future communication system, the application network element may still be an AF network element, or may have other names, which are not limited in this application.

In the architecture shown in Figure 2, the N1 interface is the reference point between UE and AMF; the N2 interface is the reference point between (R)AN and AMF, used for sending NAS messages, etc.; the N3 interface is (R)AN and UPF The reference point between them is used to transmit user plane data, etc.; the N4 interface is the reference point between SMF and UPF, used to transmit such information as the tunnel identification information of the N3 connection, data cache indication information, and downlink data notification messages ; The N6 interface is a reference point between the UPF and the DN, and is used to transmit user plane data and the like.

It can be understood that the above-mentioned network architecture applied to the embodiment of the present application is only an example, and the network architecture applicable to the embodiment of the present application is not limited thereto. Any network architecture that can realize the functions of the above-mentioned network elements is applicable to this application. Application example.

Fig. 3 shows a schematic diagram of a non-public network applied to the embodiment of the present application. The non-public network (Non-public network, NPN) shown in Figure 3 is a non-public 5G network, which can be divided into public network integrated NPN (public network integrated NPN, PNI-NPN) according to whether it depends on the network function of PLMN. And independent deployment of NPN (standalone NPN, SPNN). Introduce PNI-NPN and SPNN in turn below.

(1) in Figure 3 is PNI-NPN, which can be implemented using network slicing in PLMN. In order to prevent unauthorized UEs from accessing and selecting PNI-NPN, a closed access group (CAG) function can be additionally used. A CAG identifies a group of users that are allowed access to cells associated with the CAG (CAG cells). In order to prevent terminal devices that are not allowed to access CAG cells from automatically selecting and accessing CAG cells, CAG cells broadcast one or more CAG IDs, and configure available CAG lists and indications on terminal devices (indicating whether terminal devices are only allowed to pass through CAG cells) access to 5GS), the UE subscription data on UDM includes the available CAG list and indication, that is, the access of the terminal device is restricted by broadcasting the CAG ID and configuring the CAG ID available to the terminal device.

(2) in Figure 3 is SNPN, which does not depend on the PLMN network. SNPN is identified by PLMN ID+network identifier (Network identifier, NID), where the PLMN ID can be an inherent value reserved by a third-party operator, or it can be a deployment PLMN operator specific value for this SPNN. In SNPN, its cell broadcasts the PLMN ID+NID, and the terminal device selects the NPN to access according to the broadcast information and the configured network selection information. If the terminal device finds that the configured network selection information (PLMN ID+NID1) is not the same as the PLMN ID or PLMN ID+NID2 broadcasted by the network, the terminal device will not choose its access, that is, the terminal device will be correct by broadcasting the PLMN ID and NID. Select a cell and network.

It should be understood that, in a 5G communication system, the aforementioned mobility management network element may be an access and mobility management function (access and mobility management function, AMF) network element. In the future communication system, the mobility management network element may still be an AMF network element, or may have another name, which is not limited in this embodiment of the present application.

Fig. 4 is a schematic diagram of a system architecture applicable to the present application.

FIG. 4 shows a roaming scenario of local offloading, that is, a terminal device accesses a service through a network of a visited location (visited domain or visited location). The VPLMN is the PLMN network of the visited domain, the HPLMN is the PLMN network of the home domain (home or hometown), and the security edge protection proxy (Security Edge Protection Proxy, SEPP) is used as the border gateway between the control planes of the operator's core network. For user roaming, communication and interworking between operators, responsible for message filtering and policy management on the control plane interface between operators. VSEPP is the SEPP of the visited domain, and HSEPP is the SEPP of the home domain. The NE on the left side of the dotted line is the core network element of the control plane of the visited domain, and the NE on the right side of the dotted line is the core network element of the control plane of the home domain. The network slice-specific authentication and authorization function (NSSAAF) network element of the network slice-specific authentication and authorization function (NSSAAF) is responsible for communicating authentication messages with the third-party server. For the functions of other core network network elements, refer to the description in Figure 2, and will not be repeated here.

Roaming scenarios can be divided into local breakout (LBO) roaming and home routed (HR) roaming. The difference between the two mainly lies in whether the session is connected to the UPF of the home network. The two types of roaming are briefly introduced below.

1) HR roaming

In the HR roaming scenario, a session (such as a PDU session) is connected to the UPF of the home network (ie, H-UPF).

As an example, an HR session (such as an HR PDU session) refers to a session established when the user is located in the visited network and connected to the H-UPF. The traffic carried in the HR session is sent from the UE to the H-UPF , and then sent to the receiver.

2) LBO roaming

In the LBO roaming scenario, the session (eg, PDU session) is not connected to the UPF of the home network (ie, H-UPF).

As an example, the LBO session (such as the LBO PDU session) refers to the session established when the user is located in the visited network and connected to the V-UPF. The service flow carried in the LBO session is directly sent locally in the visited network (that is, VPLMN) Going out, there is no need to go back to the UPF (ie H-UPF) of the home network (ie HPLMN).

FIG. 5 is a schematic diagram of another system architecture applicable to the present application.

Figure 5 shows the roaming scenario of home routing, that is, the terminal device accesses the service through the home (home domain) network, where VPLMN is the PLMN network of the visited domain, HPLMN is the PLMN network of the home domain, and VSEPP is the SEPP of the visited domain , HSEPP is the SEPP of the home domain. The network elements on the left of the dotted line are the control plane core network elements of the visited domain, and the network elements on the right side of the dotted line are the control plane core network elements of the home domain. Refer to the description in FIG. 2 for the specific functions of the network elements of the core network, and details are not described here.

It should be understood that the method provided in the embodiment of the present application may be applicable to any of the foregoing scenarios.

The method provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

In order to facilitate the understanding of the embodiments of the present application, the following explanations are made:

(1) In each embodiment of the present application, if there is no special explanation and 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 are based on Its internal logical relations can be combined to form new embodiments.

(2) In this application, "at least one" means one or more, and "multiple" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. In the text description of this application, the character "/" generally indicates that the contextual objects are an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (one) of a, b and c may represent: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a , b and c. Wherein a, b and c can be single or multiple.

(3) In the present application, "first" and "second" are only used for convenience of description, and are used to distinguish objects, and are not used to limit the scope of the embodiments of the present application. Rather than being used to describe the order or sequence of features. It should be understood that the objects described in this way can be interchanged under appropriate circumstances, so as to be able to describe solutions other than the embodiments of the present application.

In the prior art, when the UE enters the coverage area of the service network, and the service network of the specific service provides the network for the dedicated service (only the specific service is provided), a corresponding access scheme needs to be provided for the UE with only a single radio frequency capability, There is no guarantee that such UEs can simultaneously access specific PLMN network services and SNPN network services (such as voice, short message). A method for accessing a communication network provided by an embodiment of the present application will be described in detail below in conjunction with the accompanying drawings to ensure the service requirements of terminal devices.

Among them, FIG. 6 to FIG. 10 introduce possible processes applicable to the embodiments of the present application. As mentioned above, in order to enable the terminal device to use the services supported by the visited network and the service supported by the home network at the same time, Figure 6 and Figure 7 mainly introduce the first service requested by the visited network according to the terminal device, and the services supported by the visited network. The second service supported by the home network and the third service supported by the home network determine whether the establishment of the PDU session initiated by the terminal device succeeds or fails. In FIG. 6 , the first AMF obtains the third service supported by the home network by interacting with the second AMF and/or UDM information, and determines the first indication information according to the first service, the second service and the third service. In Figure 7, before the terminal device initiates a registration request to the visited network, it sends the second registration request information to the home network, wherein the second AMF and/or UDM sends the third registration request information supported by the home network to Services are stored locally on network elements. In the method shown in Figure 8, the visited network sends its network capability indication information and access assistance information to the terminal device in the form of broadcast information. The information determines how to access the network. The method shown in Figure 9 is a way for a terminal device to determine access to the network according to the capability indication information and access assistance information in the broadcast information. The access method includes that the terminal device can first access the first network, and then access The second network; or the terminal device may first access the second network, and then access the first network through the second network, wherein the first network belongs to the visited network, and the second network belongs to the home network or is different from the visited network and The third network of the home network. In the method shown in Figure 10, the terminal device sends the first registration request information to the visited network. When the visited network acquires the capability information and access assistance information of the home network, when the capability information and access assistance information of the home network When an update occurs, in the registration process of the terminal device, the first PCF and the second PCF information exchange the updated capability information and access assistance information, so that the terminal device can obtain accurate capability information and access assistance information, and determine the appropriate The access method meets the service requirements of the terminal equipment.

The communication method shown in FIG. 2 and FIG. 3 in the above embodiment will be described in detail below with reference to FIG. 6 and FIG. 7 of the specific embodiment. FIG. 6 is a schematic flowchart of a method for accessing a communication network provided by the present application. The method shown in FIG. 6 may include the following steps.

S610, the terminal device sends first information to the first AMF, or in other words, the first AMF receives first information from the terminal device, where the first information is used to indicate the first service requested by the terminal device.

It should be understood that the terminal device sends the first information to the first AMF, and the first AMF judges whether the PDU session of the terminal device is established successfully or fails according to the first information, wherein the first AMF belongs to the visited network of the terminal device.

Optionally, the terminal device sends first registration request information to the visited network, where the first registration request information includes the first service requested by the terminal device.

Wherein, the first service requested by the terminal device includes one or more of the following: service identification, service type identification, provider identification, data network DNN information, and network slicing.

Further, the first AMF receives the first information from the terminal device, and the first AMF initiates a query to the home network of the terminal device for the third service supported by the home network. The method shown in Figure 6, the method also includes:

S620, the first AMF sends query service request information to the second AMF, or the second AMF receives the query service request information sent from the first AMF.

It should be understood that the query service request information is used to request service information supported by the home network. Wherein, the second AMF belongs to the home network of the terminal device.

It should also be understood that before the terminal device initiates registration on the visited network, the terminal device initiates a registration request to the home network, and the second AFM stores the third service supported by the home network in the second AMF network element according to the registration request of the terminal device local. For specific steps, please refer to FIG. 7 . In order to avoid redundancy, details are not repeated here.

S630, the second AMF sends service response information to the first AMF, or in other words, the first AMF receives the service response information sent from the second AMF.

It should be understood that after receiving the query service request information, the second AMF sends the locally stored third service to the first AMF according to the request information, that is, the second AMF sends service response information to the first AMF.

Wherein, the service response information includes the third service supported by the home network.

Further, when the service response information sent by the second AMF to the first AMF does not carry the third service supported by the home network, the first AMF sends query service request information to the UDM, and the UDM sends the response information carrying the third service For the first AMF, the method as shown in Figure 6, the method also includes:

S640, the first AMF sends query service request information to the UDM, or the UDM receives the query service request information sent from the first AMF.

Wherein, the UDM belongs to the home network to which the terminal device belongs. Step S640 is similar to step S620. In order to avoid redundancy, please refer to the above-mentioned step S620 for details, and details are not repeated here.

Further, the UDM sends the service response information to the first AMF according to the query service request information of the first AMF, as shown in the method shown in FIG. 6, the method also includes:

S650, the UDM sends service response information to the first AMF, or in other words, the first AMF receives the service response information sent from the UDM.

It should be understood that, when the first AMF sends query service request information to the second AMF, when the service response information sent by the second AMF includes the third service supported by the home network, the first AMF does not need to send query service request information to the UDM; The service response information sent by the second AMF does not include the third service supported by the home network, the first AMF sends query service request information to the UDM, and the UDM sends the third service write to the first AMF in the response information; when The service response information sent by the second AMF includes the third service supported by the home network, and the first AMF may also send query service request information to the UDM, which is not limited in this application.

It should also be understood that the first AMF may directly send the query service request information to the UDM, not limited to after step S620.

Further, the first AMF acquires the third service supported by the home network, and the first AMF determines the first indication according to the first service requested by the terminal device, the second service supported by the visited network, and the third service supported by the home network Information, the method shown in Figure 6, the method also includes:

S660. The first AMF sends the first indication information to the terminal device, or the terminal device receives the first indication information sent from the first AMF.

It should be understood that the first indication information is related to the first service requested by the terminal device, the second service supported by the visited network, and the third service supported by the home network, and the first indication information is used to indicate the PDU requested by the terminal device Session establishment succeeds or fails.

It should also be understood that the terminal device determines whether the establishment of the PDU session of the terminal device succeeds or fails according to receiving the first indication information from the first AMF.

When the first indication information indicates that the PDU session of the terminal device is established successfully.

It should be understood that when the first service requested by the terminal device belongs to the second service supported by the visited network and does not belong to the third service supported by the home network, the first indication information indicates that the PDU session of the terminal device is successfully established, and the terminal device establishes The LBO session is connected to the first access network device, wherein the PDU session is established by the SMF network element in the first access network device.

It should also be understood that when the first service requested by the terminal device belongs to the third service supported by the home network and does not belong to the second service supported by the visited network, the first indication information indicates that the PDU session of the terminal device is successfully established, and the terminal device An HR session is established to connect the first access network device and the second access network device, wherein the AMF of the first access network device establishes the PDU session, and then the SMF network element in the second access network device is selected to establish the connection.

It should also be understood that when the first service requested by the terminal device belongs to the second service supported by the visited network and the third service supported by the home network, the first indication information indicates that the PDU session of the terminal device is successfully established, and the terminal device establishes an LBO session Or an HR session.

When the first indication information indicates that the establishment of the PDU session of the terminal device fails.

It should be understood that the first service requested by the terminal device does not belong to the second service supported by the visited network and does not belong to the third service supported by the home network, and the first indication information indicates that the PDU session establishment of the terminal device fails.

Further, the first AMF sends query service request information to the second AMF and/or UDM, wherein the second AMF and/or UDM uses the registration request information sent by the terminal device to the home network to register the third-party service supported by the home network. Service information is stored in local network elements.

The specific method of storing the third service information supported by the home network in the local network element by the second AMF and/or UDM involved in the above embodiment shown in FIG. 6 will be described in detail below in combination with the method shown in FIG. instruction of. The method shown in Figure 7, the method may include:

S710. The second AMF receives second registration request information from the terminal device.

Wherein, the terminal device sends the second registration request information to the home network, and the second AMF receives the second registration request information from the terminal device.

It should be understood that the second AMF receives the second registration request information from the terminal device, and the second AMF locally stores the third service supported by the home network in the second AMF according to the second registration request information.

S720. The UDM receives second registration request information from the terminal device.

Wherein, the UDM stores the third service supported by the home network locally in the UDM according to the second registration request information, and the UDM belongs to the home network.

Further, the second AMF and/or UDM receives the second registration request information from the terminal device, and stores the third service supported by the home network locally in the network element, as in the method shown in FIG. 7 , the method further includes :

S730. The second AMF and/or UDM locally stores the third service supported by the home network according to the second registration request information.

Optionally, the third service includes one or more of the following: service identification, service type identification, supplier identification, data network DNN information, and network slicing.

It should be understood that the second AMF and/or UDM stores the third service supported by the home network locally, and when the first AMF obtains the third service supported by the home network, it may initiate a query to the second AMF and/or UDM For the service request, the second AMF and/or UDM sends the third service supported by the home network in the service response information to the first AMF, so that the first AMF can determine the first indication information.

In the following, the communication method shown in the above-mentioned embodiment shown in FIG. 2 and FIG. 3 will be described in detail in combination with FIG. 8 and FIG. The form of broadcast information is sent to the terminal device, and after receiving the broadcast information, the terminal device determines a mode of accessing the network according to the first service information requested by the terminal device. As shown in FIG. 8 , it is a schematic flowchart of a method for accessing a communication network provided by the present application. The method may include the following steps.

S801. The terminal device receives broadcast information from the visited network, or in other words, the visited network sends broadcast information to the terminal device.

It should be understood that the first access network device belongs to the visited network, the broadcast information may be sent by the first access network device, or may be acquired by the terminal device.

It should also be understood that the broadcast information includes capability information and access assistance information of the visited network, the capability indication information is used to indicate the second service supported by the visited network and/or only the second service supported, and the access assistance information It is used to indicate that the terminal device accesses the second network through the first network or the terminal device accesses the first network through the second network, wherein the first network belongs to the visited network, and the second network belongs to the home network or is different from the visited network Or the third network of the home network.

It should also be understood that after the terminal device roams to the visited network, the terminal device acquires the capability information and access assistance information of the visited network through the broadcast information of the visited network. The terminal device selects an appropriate access mode to access the network according to the requested first service requirement.

Optionally, the capability information includes one or more of the following: supportable service identifiers, supportable service category identifiers, service provider identifiers, data network DNN information, and network slices.

Optionally, the access assistance information includes one or more of the following: network identification information of the first network, network identification information of the second network, address information, N3IWF (Non -3GPP Inter Working Function) network identification, the network identification of N3IWF (Non-3GPP Inter Working Function) of the second network device, the auxiliary information required by the first network, the auxiliary information required by the second network information.

Optionally, the terminal device initiates a registration process to the visited network, through which the capability information and access assistance information of the visited network can be obtained. There are many ways for the terminal device to obtain the capability information and access assistance information of the visited network (such as pre-configuration or protocol regulations), this application does not limit this.

Further, after the terminal device receives the relevant information broadcast by the visited network, the terminal device selects a method of accessing the visited network according to the requested first service. The method shown in FIG. 8 also includes:

S802. The terminal device determines an access mode.

It should be understood that when the broadcast information of the visited network indicates that only local network service capability is indicated as unlimited, the terminal device directly accesses the visited network, or in other words, the terminal device directly accesses the first access network device.

It should also be understood that when the broadcast information of the visited network indicates that it only supports the local network service capability indication as limited, the terminal device believes that the visited network can only provide the services in the visited network support service indication, wherein, when the terminal device requests When the first service requested by the terminal device belongs to the services specified in the service indication supported by the visited network, the terminal device directly accesses the visited network; when the first service requested by the terminal device is not supported by the service indicated by the visited network, The terminal device accesses the network device according to the received access assistance information.

Wherein, for the method for the terminal device to access the network device according to the access assistance information, please refer to the method shown in FIG. 9 for details. In order to avoid redundancy, details are not described here.

According to the method shown in Figure 8, after the terminal device obtains the capability information and access assistance information, the terminal device will select an access method according to the received capability information and access assistance information, as shown in Figure 9, specifically Describes how terminal devices access the network. FIG. 9 shows a schematic flowchart of another method for accessing a communication network provided by an embodiment of the present application. The method may include the following steps.

Method A

The terminal device accesses the second network through the first network according to the access assistance information.

SA901. The terminal device accesses the first network according to the access assistance information.

Wherein, the terminal device accesses the first network according to the access assistance information.

SA902. The terminal device accesses the second network through the first network.

The terminal device accesses the second network through the first network to satisfy the first service requested by the terminal device.

Wherein, the first network is a visited network, and the second network is a home network or a third network different from the visited network and the home network.

For example, when a terminal roams to a visited network, the visited network can only provide specific local services and cannot provide other services other than local services; at this time, the terminal needs to access the specific services provided by the visited network and For services other than the specific services provided by the visited network, the terminal can choose the access method of accessing the home network through the visited network through the network access assistance information of the home network provided by the visited network, and simultaneously access The visited network and the home network, so as to obtain the services provided by the visited network and the home network at the same time.

way B

The terminal device accesses the first network through the second network according to the access assistance information.

SB901. The terminal device accesses the second network according to the access assistance information.

SB902. The terminal device accesses the first network through the second network.

It should be understood that the terminal device accesses the second network according to the access assistance information, and then accesses the first network through the second network.

For example, when a terminal roams to a visited network, the visited network can only provide specific local services and cannot provide other services other than local services; at this time, the terminal needs to access the specific services provided by the visited network and For services other than the specific services provided by the visited network, the terminal can choose the access method of accessing the visited network through other target networks through the network access assistance information of other target networks provided by the visited network, and simultaneously access The visited network and other target networks, so as to simultaneously obtain the services provided by the visited network and other target networks.

In the method shown in Figure 9, the terminal device can select an appropriate access method to access the visited network according to the capability information and access assistance information in the broadcast information of the visited network, and combine the first service requested by the terminal device, so that the terminal The device can simultaneously access specific network services and public network services of the visited network.

When the terminal device accesses the specific network service and public network service of the visited network at the same time, if the first service requested by the terminal device changes, the terminal device will choose whether to continue to visit the network according to its new first service request, or Accessing the second network through the visited network satisfies the service requirements of the terminal device itself.

Figure 8 and Figure 9 above specifically introduced how the terminal device selects the way to access the network according to the obtained capability information and access assistance information. The terminal device judges whether to update the way of accessing the network according to the first service requested by itself. The method shown in FIG. 10 may include the following steps.

S1001. The terminal device sends first registration request information to the visited network, or in other words, the visited network receives the first registration request information from the terminal device.

It should be understood that the terminal device obtains the capability information and access assistance information of the access network through the first registration request information. When the capability information and access assistance information are configured in the AMF of the visited network, the first access network device A registration request message is sent to the first AMF, the method shown in Figure 10, the method also includes:

S1002. The first access network device of the visited network sends the first registration request information of the terminal device to the first AMF network element belonging to the visited network.

It should be understood that the first AMF network element acquires the capability indication and access assistance information of the visited network from the first PCF network element, where the first PCF belongs to the visited network.

Further, the first AMF sends the first request information to the first PCF, as in the method shown in FIG. 10 , the method further includes:

S1003, the first AMF network element sends the first request information to the first PCF network element, or the first PCF network element receives the first request information sent from the first AMF network element.

Wherein, the first request information is used to obtain capability indication information and access assistance information of the visited network.

It should be understood that the first PCF receives the first request information, and sends the capability indication information and access assistance information to the first AMF network element according to the first request information.

Optionally, the first AMF acquires the updated capability information and access assistance information of the home network from the second PCF network element belonging to the home network through the UE Policy Association sub-flow in the registration process of the terminal device.

Further, the first PCF receives the third information sent from the second PCF, as in the method shown in FIG. 10 , the method further includes:

S1004. The first PCF network element receives the third information sent from the second PCF network element, or in other words, the second PCF network element sends the third information to the first PCF.

It should be understood that the third information includes updated capability information and access assistance information of the home network.

It should also be understood that when the capability information and access assistance information of the home network change, information exchange is performed between the home network and the visited network through the PCF network element, and relevant information is updated to the terminal device.

After the first PCF receives the third information sent by the second PCF network element, the first PCF sends the second response information to the second PCF, as in the method shown in FIG. 10 , the method also includes:

S1005. The first PCF sends the second response information to the second PCF, or in other words, the second PCF receives the second response information sent from the first PCF.

Wherein, the second response information indicates that the first PCF receives response information of the third information sent by the second PCF.

Further, the first PCF sends the first response information to the first AMF, as in the method shown in FIG. 10 , the method further includes:

S1006. The first PCF network element sends first response information to the first AMF network element, or in other words, the first AMF receives the first response information sent from the first PCF.

It should be understood that when the capability information and access assistance information of the home network are updated, the first response information includes the capability information and access assistance information of the visited network and the updated capability information and access assistance information of the home network; If the capability information and access assistance information of the home network are not updated, the first response information includes the capability information and access assistance information of the visited network.

Further, the first AMF network element receives the first response information sent from the first PCF, and sends the registration completion information to the terminal device, as in the method shown in FIG. 10 , the method also includes:

S1007, the first AMF network element sends registration completion information to the terminal device, or in other words, the terminal device receives the registration completion information sent from the first AMF network element.

It should be understood that the registration completion information includes network capability information and access assistance information.

Wherein, the registration completion information includes capability information and access assistance information of the visited network, or the registration completion information includes capability information and access assistance information of the visited network and updated capability information and access assistance information of the home network.

Further, the terminal device receives the registration completion information sent from the first AMF network element, and determines whether to update the access mode. In the method shown in FIG. 10, the method also includes:

S1008. The terminal device determines whether to update the access mode.

It should be understood that after the terminal device receives the registration completion information, the terminal device chooses to continue to reside on the visited network according to the requested first service requirements, or chooses other access methods to access the visited network according to the requested first service. The access method is the method shown in FIG. 9 above. In order to avoid redundancy, details are not repeated here.

The method for accessing the communication network provided by the embodiment of the present application is described in detail above with reference to FIGS.

Hereinafter, the device for accessing a communication network provided by the embodiment of the present application will be described in detail in FIG. 11 to FIG. 13 . It should be understood that the descriptions of the device embodiments correspond to the descriptions of the method embodiments. Therefore, for content that is not described in detail, reference may be made to the method embodiments above. For brevity, some content will not be repeated here.

Fig. 11 is a schematic block diagram of an apparatus for accessing a communication network provided by an embodiment of the present application. The device 1100 includes a transceiver unit 1110 and a processing unit 1120 . The transceiver unit 1110 may be used to implement corresponding communication functions. The transceiver unit 1110 may also be called a communication interface or a communication unit. The processing unit 1120 may be configured to implement corresponding processing functions.

Optionally, the device 1100 further includes a storage unit, which can be used to store instructions and/or data, and the processing unit 1120 can read the instructions and/or data in the storage unit, so that the device implements the foregoing method embodiments Actions of devices or network elements in the network.

The apparatus 1100 can be used to execute the actions performed by the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the above method embodiments. In this case, the apparatus 1100 can be the first AMF, The second AMF, UDM, or components of the first AMF, second AMF, UDM, first access network device or terminal device, the transceiver unit 1110 is used to execute the first AMF, second AMF, Operations related to sending and receiving of UDM, first access network device or terminal device, the processing unit 1120 is used to execute the processing of the first AMF, second AMF, UDM, first access network device and terminal device in the above method embodiment related operations.

It should also be understood that the apparatus 1100 here is embodied in the form of functional units. The term "unit" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor for executing one or more software or firmware programs (such as a shared processor, a dedicated processor, or a group processor, etc.) and memory, incorporated logic, and/or other suitable components to support the described functionality. In an optional example, those skilled in the art can understand that the apparatus 1100 may specifically be the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the foregoing embodiments, and may be used to perform the foregoing various Each process and/or step corresponding to the first AMF, the second AMF, the UDM, the first access network device or the terminal device in the method embodiment, or, the apparatus 1100 may specifically be the first AMF, the second AMF in the above embodiment The second AMF, UDM, first access network device or terminal device can be used to execute the various processes and processes corresponding to the first AMF, second AMF, UDM, first access network device or terminal device in the above method embodiments /or steps, in order to avoid repetition, no more details are given here.

The apparatus 1100 of each of the above solutions has the function of implementing the corresponding steps performed by the first AMF, the second AMF, UDM, the first access network device or the terminal device in the above method, or, the apparatus 1100 of each of the above solutions has the function of implementing the above method Functions of corresponding steps performed by the first AMF, the second AMF, the UDM, the first access network device or the terminal device. The functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more modules corresponding to the above functions; for example, the transceiver unit can be replaced by a transceiver (for example, the sending unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver computer), and other units, such as a processing unit, may be replaced by a processor to respectively perform the sending and receiving operations and related processing operations in each method embodiment.

In addition, the above-mentioned transceiver unit 1110 may also be a transceiver circuit (for example, may include a receiving circuit and a sending circuit), and the processing unit may be a processing circuit.

It should be noted that the apparatus in FIG. 11 may be the network element or device in the foregoing embodiments, or may be a chip or a chip system, for example, a system on chip (system on chip, SoC). Wherein, the transceiver unit may be an input-output circuit or a communication interface; the processing unit is a processor or a microprocessor or an integrated circuit integrated on the chip. It is not limited here.

As shown in FIG. 12 , this embodiment of the present application provides another communication device 1200 . The device 1200 includes a processor 1210, the processor 1210 is coupled with a memory 1220, the memory 1220 is used for storing computer programs or instructions and/or data, and the processor 1210 is used for executing the computer programs or instructions stored in the memory 1220, or reading the memory 1220 The stored data is used to execute the methods in the above method embodiments.

Optionally, there are one or more processors 1210 .

Optionally, there are one or more memories 1220 .

Optionally, the memory 1220 is integrated with the processor 1210, or is set separately.

Optionally, as shown in FIG. 12 , the apparatus 1200 further includes a transceiver 1230, and the transceiver 1230 is used for receiving and/or sending signals. For example, the processor 1210 is configured to control the transceiver 1230 to receive and/or send signals.

As a solution, the apparatus 1200 is used to implement the operations performed by the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in each method embodiment above.

For example, the processor 1210 is configured to execute the computer programs or instructions stored in the memory 1220, so as to implement related operations of the first control plane device in each method embodiment above. For example, the first AMF in any one of the embodiments shown in FIG. 6 or FIG. 7 , or the method of the first AMF in any one of the embodiments shown in FIG. 6 or FIG. 7 .

It should be understood that the processor mentioned in the embodiment of the present application may be a central processing unit (central processing unit, CPU), and may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits ( application specific integrated circuit (ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory and/or a nonvolatile memory. Among them, the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electronically programmable Erases programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM). For example, RAM can be used as an external cache. As an example and not limitation, RAM includes the following multiple forms: static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (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 connection dynamic random access memory (synchlink DRAM, SLDRAM) and direct Memory bus random access memory (direct rambus RAM, DR RAM).

It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, the memory (storage module) may be integrated in the processor.

It should also be noted that the memories described herein are intended to include, but are not limited to, these and any other suitable types of memories.

As shown in FIG. 13 , an embodiment of the present application provides a chip system 1300 . The chip system 800 (or also called a processing system) includes a logic circuit 1310 and an input/output interface (input/output interface) 1320 .

Wherein, the logic circuit 1310 may be a processing circuit in the chip system 1300 . The logic circuit 1310 may be coupled to the storage unit, and invoke instructions in the storage unit, so that the chip system 1300 can implement the methods and functions of the various embodiments of the present application. The input/output interface 1320 may be an input/output circuit in the system on chip 1300, which outputs information processed by the system on chip 1300, or inputs data or signaling information to be processed to the system on chip 1300 for processing.

As a solution, the chip system 1300 is used to implement the operations performed by the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the above method embodiments.

For example, the logic circuit 1310 is used to implement the operations related to the processing of the first AMF in the above method embodiments, such as the operations related to the sending and/or receiving of the first AMF in the method embodiments shown in Figures 6 to 10, such as Operations related to sending and/or receiving performed by the first AMF in any one of the embodiments shown in FIG. 6 to FIG. 10 . .

The embodiments of the present application further provide a computer-readable storage medium, on which computer instructions for implementing the methods executed by the network element in the foregoing method embodiments are stored.

For example, when the computer program is executed by a computer, the computer can implement the methods performed by the user plane network element in each embodiment of the foregoing method.

In another example, when the computer program is executed by a computer, the computer can implement the methods performed by the session management network element in the above method embodiments.

In another example, when the computer program is executed by a computer, the computer can implement the method performed by the edge application server discovering the network element in each embodiment of the above method.

The embodiments of the present application further provide a computer program product, including instructions, and when the instructions are executed by a computer, the methods performed by the network elements in the foregoing method embodiments are implemented.

The embodiment of the present application also provides a communication system, including one or more of the aforementioned user plane network element, session management network element, and edge application server discovery network element.

For explanations and beneficial effects of relevant content in any of the devices provided above, reference may be made to the corresponding method embodiments provided above, and details are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device 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 can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device 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 can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

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

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

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

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims

A method for accessing a communication network, comprising:

The first mobility management network element receives first information sent by the terminal device, where the first information is used to indicate the first service requested by the terminal device;

The first mobility management network element determines first indication information according to the first service requested by the terminal device, the second service supported by the visited network, and the third service supported by the home network, and the first indication information is used for Indicating the success or failure of the protocol data unit session establishment of the terminal device;

The first mobility management network element F sends the first indication information to the terminal device,

Wherein, the first mobility management network element belongs to the visited network.
The method according to claim 1, further comprising:

The first mobility management network element receives session establishment request information sent by the terminal device, where the session establishment request information includes the first service requested by the terminal device.
The method according to claim 1 or 2, characterized in that the method further comprises:

The first mobility management network element sends query service request information to the second mobility management network element and/or the first mobility management network element sends query service request information to the data management network element, and the query service request information is used for querying the third service supported by the home network,

Wherein, the second mobility management network element and the data management network belong to the home network.
The method according to claim 3, wherein before the first mobility management network element sends the query service request information, the method further comprises:

The first mobility management network element receives first registration request information from the terminal device, where the first registration request information is used to request access to the visited network.
The method according to claim 3 or 4, wherein the method further comprises:

The first mobility management network element receives the service response information sent by the second mobility management network element and/or the first mobility management network element receives the service response information sent by the data management network,

Wherein, the service response information includes the third service supported by the home network.
The method according to any one of claims 1 to 5, wherein the first indication information is used to indicate the success or failure of the protocol data unit session establishment of the terminal device, including:

The first mobility management network element F sends first indication information to the terminal device, where the first indication information is used to indicate that the protocol data unit session of the terminal device is successfully established.
The method according to claim 6, wherein the requested first service belongs to the second service and does not belong to the third service,

The protocol data unit session is established by a session management function in the visited network, and the protocol data unit session type is local breakthrough roaming; or,

The requested first service belongs to the third service and does not belong to the second service,

The protocol data unit session is established by the session management function in the home network, and the protocol data unit session type is home routing roaming; or,

The requested first service belongs to the second service and the third service,

The PDU session is established by the session management function in the visited network and/or the session management function in the home network, and the protocol data unit session type is the local breakthrough roaming and/or the home routing roaming.
A method for accessing a communication network, comprising:

The second mobility management network element receives second registration request information of the terminal device, where the second registration request information includes a third service supported by the home network;

storing, by the second mobility management network element, the third service locally in the second mobility management network element according to the second registration request information,

Wherein, the second mobility management network element belongs to the home network.
The method according to claim 8, characterized in that the method further comprises:

The second mobility management network element receives query service request information sent by the first mobility management network element, where the query service request information is used to query a third service supported by the home network;

sending, by the second mobility management network element, service response information to the first mobility management network element, where the service response information includes a third service supported by the home network,

Wherein, the first mobility management network element belongs to the visited network.
A method for accessing a communication network, comprising:

The data management network element receives second registration request information of the terminal device, where the second registration request information includes a third service supported by the home network;

storing, by the data management network element, the third service locally in the data management network element according to the second registration request information,

Wherein, the data management network element belongs to the home network.
The method according to claim 10, characterized in that the method further comprises:

The data management network element receives query service request information sent by the first mobility management network element, and the query service request information is used to query the third service supported by the home network;

sending, by the data management network element, service response information to the first mobility management network element, where the service response information includes a third service supported by the home network,

Wherein, the first mobility management network element belongs to the visited network.
A method for accessing a communication network, comprising:

The terminal device receives broadcast information from the first access network device, where the broadcast information includes capability information and access assistance information;

The terminal device determines an access method for accessing the network device according to the broadcast information, and the access method includes: the terminal device accesses the visited network, or the terminal device accesses the second network through the first network , or the terminal device accesses the first network through the second network,

Wherein, the first access network device belongs to the visited network, the first network is the visited network, and the second network is the home network or is different from the visited network and the home network. The third network of the ground network.
The method according to claim 12, wherein the terminal device accesses the second network through the first network or the terminal device accesses the first network through the second network, comprising :

The terminal device sends a third registration request message to a third access network device, where the third registration request message is used to request access to the second network, or,

The third registration request message is used to request access to the first network,

Wherein, the third access network device belongs to the first network or the second network.
The method according to claim 12, wherein the terminal device accessing the visited network comprises:

The terminal device sends first registration request information to a first mobility management network element, where the first registration request information is used to access the visited network,

Wherein, the first mobility management network element belongs to the visited network.
The method according to claim 14, characterized in that the method further comprises:

The terminal device receives a registration completion message from the first mobility management network element, where the registration completion message includes second information, and the second information includes updated capability information and/or updated access assistance information;

The terminal device determines whether to update the access mode according to the second information.
The method according to any one of claims 12 to 15, wherein the capability indication information includes at least one of the following:

Supportable service identifiers, supportable service category identifiers, service provider identifiers, data network information, and network slicing.
The method according to any one of claims 12 to 16, wherein the access assistance information includes at least one of the following:

The network identifier of the first network, the network identifier of the second network, address information, the network identifier of the non-3rd Generation Partnership Project interworking function of the first network device, the non-third generation partnership project interworking function network identifier of the second network device, The network identifier of the GPP interworking function, the auxiliary information required by the first network, and the auxiliary information required by the second network.
A method for accessing a communication network, comprising:

The first access network device determines broadcast information;

The first access network device sends the broadcast information to the terminal device, the broadcast information includes capability information and access assistance information, and the capability information is used to indicate the second service supported by the visited network and/or only support the second service, the access assistance information is used to instruct the terminal device to access the second network through the first network or to access the first network through the second network,

Wherein, the first network is the visited network, and the second network is the home network or a third network different from the visited network and the home network.
The method according to claim 18, wherein the capability indication information includes at least one of the following:

Supportable service identification, supportable service type identification, service provider identification, data network DNN information, and network slicing.
The method according to claim 18 or 19, wherein the access assistance information includes at least one of the following:

The network identifier of the first network, the network identifier of the second network, address information, the network identifier of the non-3rd Generation Partnership Project interworking function of the first network device, the non-third generation partnership project interworking function network identifier of the second network device, The network identifier of the GPP interworking function, the auxiliary information required by the first network, and the auxiliary information required by the second network.
A method for accessing a communication network, comprising:

The first mobility management network element receives first registration request information sent by the terminal device, where the first registration request information is used for the network that the terminal device requests to register and visit;

The first mobility management network element sends registration completion information to the terminal device, where the registration completion information includes capability information and/or access assistance information,

Wherein, the first mobility management network element belongs to the visited network.
The method according to claim 21, wherein the registration completion information further includes updated capability information and/or updated access assistance information.
The method according to claim 21 or 22, further comprising:

The first mobility management network element sends first request information to the first policy control network element, where the first request information is used to obtain capability information and access assistance information;

receiving, by the first mobility management network element, first response information from the first policy control network element, where the first response information includes the capability information and the access assistance information,

Wherein, the first PCF belongs to the visited network.
The method according to claim 23, wherein the first mobility management network element receives the first response information from the first policy control network element, comprising:

The first policy control network element receives third information sent from the second policy control network element, where the third information includes updated capability information and/or access assistance information;

sending, by the first policy control network element, the first response information to the first mobility management network element, where the first response information further includes the updated capability information and/or access assistance information,

Wherein, the second policy control network element belongs to the home network.
The method according to any one of claims 21 to 24, wherein the capability indication information is at least one of the following:

Supportable service identifiers, supportable service category identifiers, service provider identifiers, data network information, and network slicing.
The method according to any one of claims 21 to 25, wherein the access assistance information includes at least one of the following:

The network identifier of the first network, the network identifier of the second network, address information, the network identifier of the non-3rd Generation Partnership Project interworking function of the first network device, the non-third generation partnership project interworking function network identifier of the second network device, The network identifier of the GPP interworking function, the auxiliary information required by the first network, and the auxiliary information required by the second network.
A communication device, characterized by comprising:

A processor configured to execute the computer program stored in the memory, so that the device executes the method according to any one of claims 1 to 26.
The apparatus of claim 27, further comprising the memory.
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 run on a computer, the computer executes any one of claims 1-26. method described in the item.
A computer program product, characterized in that the computer program product comprises instructions for performing the method according to any one of claims 1 to 26.