CN115623451A

CN115623451A - Conditional switching method and device

Info

Publication number: CN115623451A
Application number: CN202110786362.8A
Authority: CN
Inventors: 刘佳敏
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2023-01-17
Also published as: WO2023284642A1

Abstract

The embodiment of the application discloses a condition switching method and equipment, and belongs to the technical field of communication. The condition switching method of the embodiment of the application comprises the following steps: the first terminal receives the reconfiguration signaling of the condition switching; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes; and the first terminal executes a condition switching process according to the reconfiguration signaling.

Description

Conditional switching method and device

Technical Field

The present application belongs to the field of communications technologies, and in particular, to a method and an apparatus for conditional switching.

Background

In a typical sidelink (sidelink) relay scenario, a remote terminal (remote UE) forwards its data to a network side device through a sidelink link (or relay link) between the remote terminal and a relay terminal (relay UE). In the sidelink relay scenario, data transmission is performed between a remote terminal and a network side device, and the relay terminal plays a role in data transfer, where a User to network universal interface (Uu) interface is between the relay terminal and the network side device, and a sidelink (or PC 5) interface is between the relay terminal and the remote terminal.

In the related technology, only a common terminal (Uu terminal) is supported to perform a conditional switching process in which a candidate node is a network node, and a conditional switching process related to a sidelink relay scene is not supported, so that the switching success rate of the terminal is low.

Disclosure of Invention

The embodiment of the application provides a condition switching method and device, which can solve the problem of low switching success rate of a terminal in the related art due to the fact that the condition switching process related to a sidelink relay scene is not supported.

In a first aspect, a conditional switching method is provided, including: the first terminal receives the reconfiguration signaling of the condition switching; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes; and the first terminal executes a conditional switching process according to the reconfiguration signaling.

In a second aspect, a conditional switching method is provided, including: the network side equipment sends a reconfiguration signaling of condition switching, wherein the reconfiguration signaling is used for a first terminal to execute a condition switching process; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

In a third aspect, a condition switching apparatus is provided, including: a receiving module, configured to receive a reconfiguration signaling for conditional switching; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes; and the conditional switching module is used for executing a conditional switching process according to the reconfiguration signaling.

In a fourth aspect, a condition switching apparatus is provided, including: a sending module, configured to send a reconfiguration signaling for conditional switching, where the reconfiguration signaling is used for a first terminal to perform a conditional switching process; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

In a fifth aspect, there is provided a terminal comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the method according to the first aspect.

A sixth aspect provides a terminal, including a processor and a communication interface, where the processor is configured to execute a conditional handover process according to a reconfiguration signaling, and the communication interface is configured to receive the reconfiguration signaling of the conditional handover; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

In a seventh aspect, a network-side device is provided, which includes a processor, a memory, and a program or an instruction stored on the memory and executable on the processor, and when executed by the processor, the program or the instruction implements the method according to the second aspect.

In an eighth aspect, a network side device is provided, which includes a processor and a communication interface, where the communication interface is configured to send a reconfiguration signaling for conditional handover, and the reconfiguration signaling is used for a first terminal to perform a conditional handover procedure; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

In a ninth aspect, there is provided a readable storage medium on which is stored a program or instructions which, when executed by a processor, carries out the method of the first aspect or the method of the second aspect.

In a tenth aspect, a chip is provided, the chip comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to execute a program or instructions to implement the method according to the first aspect, or to implement the method according to the second aspect.

In an eleventh aspect, there is provided a computer program/program product stored on a non-transitory storage medium, the program/program product being executable by at least one processor to implement a method as described in the first aspect, or to implement a method as described in the second aspect.

In the embodiment of the present application, the reconfiguration signaling received by the first terminal includes information related to a candidate node, where the candidate node includes a network node and/or a relay node, so that the first terminal may switch to the network node or the relay node, which can solve a problem in a related art that a conditional switching process related to a sidelink relay scenario is not supported, and improve a switching success rate of the terminal.

Drawings

Fig. 1 is a schematic diagram of a wireless communication system according to an embodiment of the present application;

FIG. 2 is a schematic flow chart diagram of a conditional switching method according to an embodiment of the present application;

FIG. 3 is a schematic flow chart diagram of a conditional switching method according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a condition switching apparatus according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a condition switching apparatus according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a network-side device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below clearly with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived from the embodiments given herein by a person of ordinary skill in the art are intended to be within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in other sequences than those illustrated or otherwise described herein, and that the terms "first" and "second" used herein generally refer to a class and do not limit the number of objects, for example, a first object can be one or more. In addition, "and/or" in the specification and the claims means at least one of connected objects, and a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

It is noted that the techniques described in the embodiments of the present application are not limited to Long Term Evolution (LTE)/LTE Evolution (LTE-Advanced) systems, but may also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), time Division Multiple Access (TDMA), frequency Division Multiple Access (FDMA), orthogonal Frequency Division Multiple Access (OFDMA), single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described techniques can be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for purposes of example, and, using NR terminology in much of the description below, the techniques may also be applied to applications other than NR system applications, such as generation 6 (6) systems ^th Generation, 6G) communication system.

Fig. 1 shows a schematic diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network-side device 12. Wherein, the terminal 11 may also be called a terminal Device or a User Equipment (UE), the terminal 11 may be a Mobile phone, a Tablet Computer (Tablet Computer), a Laptop Computer (Laptop Computer) or a notebook Computer, a Personal Digital Assistant (PDA), a palmtop Computer, a netbook, a super-Mobile Personal Computer (UMPC), a Mobile Internet Device (MID), a Wearable Device (Wearable Device) or a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), and other terminal side devices, the Wearable Device includes: smart watches, bracelets, earphones, glasses, and the like. It should be noted that the embodiment of the present application does not limit the specific type of the terminal 11. The network-side device 12 may be a Base Station or a core network, wherein the Base Station may be referred to as a node B, an evolved node B, an access Point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a next generation node B (gNB), a home node B, a home evolved node B (hbo), a WLAN access Point, a WiFi node, a Transmission Receiving Point (TRP), or some other suitable term in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, and it should be noted that, in the embodiment of the present application, only the Base Station in the NR system is taken as an example, but the specific type of the Base Station is not limited.

The method and the device for switching the condition provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

As shown in fig. 2, the present embodiment provides a conditional switching method 200, which may be performed by a terminal, in other words, by software or hardware installed in the terminal, and includes the following steps.

S202: a first terminal receives a reconfiguration signaling of Conditional HandOver (CHO); wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

In this embodiment, the first terminal may be a remote terminal under a sidelink relay architecture, that is, before the condition is switched, the first terminal and the relay terminal are connected through a relay link. The first terminal may also be a User to network universal interface (Uu) link terminal, that is, before the condition switch, the first terminal is directly connected to a network side device (such as a base station) through a Uu link,

in the case that the first terminal is a remote terminal, the candidate nodes configured for the first terminal by the network side device may include a network node and/or a relay node. In the case that the first terminal is a Uu link terminal, the candidate node configured by the network side device for the first terminal may include one of the following: a network node and a relay node; and a relay node.

Optionally, before S202, the first terminal may further receive a measurement configuration signaling for conditional switching, where the measurement configuration signaling may configure a measurement object and the like for the first terminal, and the measurement object may include at least one of: a network node, a relay node near the first terminal.

The first terminal can measure the measurement object after receiving the measurement configuration signaling, and can report the measurement result under the condition of meeting the reporting condition. According to the measurement result, if it is found that the configuration requirement of the conditional handover is satisfied, for example, the link quality of the current Uu link of the first terminal is not good, and there are alternative available relay nodes around the first terminal to provide potential relay link transmission for the first terminal, the network side device may consider the relay node as a candidate node of the first terminal, and configure the candidate node to the first terminal through the reconfiguration signaling of the conditional handover. For another example, if the link quality of the current relay link of the first terminal is not good, and there are network nodes and/or relay nodes that are available in the periphery of the first terminal as candidates for the first terminal to provide transmission of the potential Uu link for the first terminal, the network nodes and/or relay nodes may be considered as candidates for the first terminal, and configured to the first terminal through reconfiguration signaling of conditional handover

S204: and the first terminal executes a conditional switching process according to the reconfiguration signaling.

For example, when the first terminal determines that the target relay node among the candidate nodes satisfies the condition handover execution condition, the first terminal may disconnect the connection with the source network node or the source relay node and access the relay link provided by the target relay node.

For example, the first terminal may disconnect the connection with the source relay node and access the Uu link provided by the target network node when determining that the target network node among the candidate nodes satisfies the conditional handover execution condition.

In the conditional handover method provided by the embodiment of the present application, the reconfiguration signaling received by the first terminal includes the candidate node, and the candidate node includes the network node and/or the relay node, so that the first terminal can be handed over to the network node or the relay node, thereby solving the problem in the related art that the conditional handover process related to the sidelink relay scenario is not supported, and improving the handover success rate of the terminal.

For example, in the case that the first terminal is a remote terminal, because the candidate node includes a network node and/or a relay node, the first terminal may switch to the network node and may also switch to the relay node, so as to improve the switching success rate, and the probability of the switching failure is low, thereby improving the service experience of the first terminal in the switching process; meanwhile, the remote terminal can fully enjoy various gains of condition switching, the switching success rate is improved, and the service experience and the system efficiency of the remote terminal are guaranteed.

For another example, when the first terminal is a Uu link terminal, the candidate node includes a network node and/or a relay node, and the first terminal may be switched to the network node and may also be switched to the relay node, so that a switching success rate is improved, a probability of a switching failure is low, and a service experience of the first terminal in a switching process is improved.

Optionally, the reconfiguration information received by the first terminal may include at least one of the following 1) to 6):

1) Information of the network node, for example, an identification of the network node among the candidate nodes, an identification of the Uu link provided by the network node, and the like.

2) Configuration information of the network node, for example, link bearer configuration information, etc.

3) And switching the execution condition according to the first condition corresponding to the network node.

4) Information of the relay node. For example, the Identity of the relay node (relay UE ID), the PC5 layer 2 Identity of the relay node (PC 5 layer-2ID of the relay UE), the Uu link Identity of the relay node connection (Uu ID of the relay UE), such as Cell-Radio Network Temporary Identity (C-RNTI), etc.

5) Configuration information of the relay node. Such as PC5 Radio Link Control (RLC) bearer configuration, etc.

6) And switching the execution condition according to a second condition corresponding to the relay node.

Optionally, the second condition switching execution condition includes at least one of:

1) The link quality of the Uu link is below a first threshold. The Uu link may include a Uu link that is the best in (Uu) link quality and that can be searched by the first terminal, and may further include a Uu link of the source network node before the conditional handover of the first terminal.

The link Quality mentioned in this embodiment is lower than a first threshold, for example, the Reference Signal Receiving Power (RSRP) is lower than a threshold 11, and for example, the Reference Signal Receiving Quality (RSRQ) or the Signal to Interference plus Noise Ratio (SINR) is higher than a threshold 12; where threshold 11 and threshold 12 are both related to the first threshold.

2) The link quality of the relay link is above a second threshold. The relay link may include a relay link provided by a relay node of the candidate nodes.

The link quality mentioned in this embodiment is above a second threshold, e.g., RSRP is above threshold 21, and for example, RSRQ or SINR is below threshold 22; where both threshold 21 and threshold 22 are related to the second threshold.

In general, since the relay link is different from the Uu link, the first conditional handover performing condition and the second conditional handover performing condition are generally configured independently. Of course, in very special cases, multiplexing is not excluded, for example, the second conditional switch execution condition multiplexes the first conditional switch execution condition. Specifically, for example, the second conditional handover execution condition and the first conditional handover execution condition are both that the link quality of the cell provided by the source network node is sufficiently poor, that is, conditional handover is executed, and at this time, the first terminal may not evaluate the candidate node, so as to improve handover efficiency and improve handover success rate.

In one example, the performing, by the first terminal, a conditional handover procedure according to the reconfiguration signaling includes: and under the condition that a target relay node in the candidate nodes meets the second conditional handover execution condition, the first terminal disconnects the source network node or the source relay node and accesses a relay link provided by the target relay node.

The aforementioned accessing the relay link provided by the target relay node includes at least one of:

1) Performing a discovery procedure with the target relay node.

2) And establishing PC5 connection with the target relay node.

3) The reconfiguration complete message is sent over the PC5 link.

In another example, the performing, by the first terminal, a conditional handover procedure according to the reconfiguration signaling includes: and under the condition that a target network node in the candidate nodes meets the first conditional handover execution condition, the first terminal disconnects with a source relay node and accesses a Uu link provided by the target network node.

After the first terminal disconnects from a source relay node and accesses a Uu link provided by the target network node, the method further includes at least one of:

1) And releasing the RLC bearing of the PC5 interface between the source relay node and the source relay node.

2) Releasing the PC5 connection with the source relay node.

Optionally, the first terminal disconnects from the source relay node, and after accessing the Uu link provided by the target network node, the first terminal may further send reconfiguration complete information.

Optionally, for an end-to-end radio link control reliable mode radio bearer (E2E RLC AM RB), the first terminal may further disconnect the connection with the source relay node, and after accessing the Uu link provided by the target network node, the first terminal may further trigger a status report (status report) on a Packet Data Convergence Protocol (PDCP) layer, and then may further recover Data loss caused by a handover path according to a retransmission operation of the status report, thereby achieving a purpose of lossless handover.

Optionally, the reconfiguration signaling mentioned in the foregoing embodiments may include a conditional handover execution condition, where executing the conditional handover procedure according to the reconfiguration signaling includes: when M network nodes and N relay nodes simultaneously meet respective condition switching execution conditions, selecting a target network node from the M network nodes or selecting a target relay node from the N relay nodes according to a preset rule; wherein M and N are positive integers.

The preset rule may include one of the following.

1) Preferentially selecting a target network node from the M network nodes.

2) And preferentially selecting a target relay node from the N relay nodes.

3) And preferentially selecting a target network node from the M network nodes under the condition that the requirement of the first terminal on the service performance meets a first condition.

4) And preferentially selecting a target relay node from the N relay nodes when the requirement of the first terminal on the power saving performance meets a second condition.

5) And preferentially selecting a target network node from the M network nodes or preferentially selecting a target relay node from the N relay nodes according to configuration determination.

The preset rule may further include at least one of the following: uu link quality condition, PC5 link quality condition, uu link load condition, PC5 link load condition, and power condition of the N relay nodes. The embodiment further introduces other dimensions or conditions to assist the selection of the first terminal and reduce the implementation difficulty of the first terminal.

In one example, the selecting the target relay node from the N relay nodes includes: selecting a target relay node from the N relay nodes according to at least one of the following conditions: the distance between the first terminal and the N relay nodes, the channel conditions of the N relay nodes, the relay capacity of the N relay nodes, and whether the binding and attribution relationship exists between the first terminal and the N relay nodes.

Optionally, before the first terminal receives the reconfiguration signaling for conditional handover in the foregoing embodiments, the method further includes: the first terminal sends capability information of conditional switch, wherein the capability information is used for indicating at least one of the following: the first terminal supports Uu link condition switching; the first terminal supports relay link condition handover.

After the step of the first terminal sending capability information for conditional switch and before the step of the first terminal receiving reconfiguration signaling for conditional switch, the method further comprises: the first terminal receives a measurement configuration signaling of condition switching; wherein the measurement configuration signaling comprises a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following conditions.

1) And in the case that the Uu link quality is lower than a third threshold, the first terminal starts to measure the relay nodes in the candidate nodes.

2) And the measurement result of the first terminal to the relay node in the candidate nodes is reported periodically or is reported triggered by an event.

3) The first terminal measures relay nodes in the candidate nodes based on discovery signals and/or data signals.

The conditional switching method according to the embodiment of the present application is described in detail above with reference to fig. 2. A conditional switching method according to another embodiment of the present application will be described in detail below with reference to fig. 3. It is to be understood that the interaction between the network side device and the terminal described from the network side device is the same as that described at the terminal side in the method shown in fig. 2, and the related description is appropriately omitted to avoid redundancy.

Fig. 3 is a schematic flow chart of a conditional access method according to an embodiment of the present application, which can be applied to a network device. As shown in fig. 3, the method 300 includes the following steps.

S302: the network side equipment sends a reconfiguration signaling of condition switching, wherein the reconfiguration signaling is used for a first terminal to execute a condition switching process; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

According to the condition switching method provided by the embodiment of the application, the network side equipment sends the reconfiguration signaling of condition switching, the reconfiguration signaling comprises the candidate node, and the candidate node comprises the network node and/or the relay node, so that the first terminal can be switched to the network node or the relay node, the condition switching process related to the situation that the sidelink relay is not supported in the related technology can be solved, and the switching success rate of the terminal is improved.

Optionally, as an embodiment, in a case that the first terminal is a remote terminal, the candidate node includes the network node and/or the relay node; in a case that the first terminal is a Uu link terminal, the candidate node includes one of: the network node and the relay node; the relay node.

Optionally, as an embodiment, the reconfiguration signaling includes at least one of: information of the network node; configuration information of the network node; a first condition switch execution condition corresponding to the network node; information of the relay node; configuration information of the relay node; and a second condition corresponding to the relay node switches the execution condition.

Optionally, as an embodiment, the second conditional switch execution condition includes at least one of: the link quality of the Uu link is lower than a first threshold; the link quality of the relay link is above a second threshold.

Optionally, as an embodiment, the first conditional switch execution condition and the second conditional switch execution condition are configured independently; or the second conditional switch execution condition multiplexes the first conditional switch execution condition.

Optionally, as an embodiment, the reconfiguration signaling includes a condition to perform handover, and the reconfiguration signaling is used for the first terminal to perform the following process: when M network nodes and N relay nodes simultaneously meet respective condition switching execution conditions, selecting a target network node from the M network nodes or selecting a target relay node from the N relay nodes according to a preset rule; wherein M and N are positive integers.

Optionally, as an embodiment, the preset rule may include one of the following.

1) Preferentially selecting a target network node from the M network nodes.

2) And preferentially selecting a target relay node from the N relay nodes.

Optionally, as an embodiment, the preset rule further includes at least one of: uu link quality condition, PC5 link quality condition, uu link load condition, PC5 link load condition, and power condition of the N relay nodes.

Optionally, as an embodiment, the selecting a target relay node from the N relay nodes includes: selecting a target relay node from the N relay nodes according to at least one of the following conditions: distance, channel conditions, relay capabilities, binding and affiliation between terminals.

Optionally, as an embodiment, before the network side device sends the reconfiguration signaling for conditional handover, the method further includes: the network side equipment receives capability information of condition switching, wherein the capability information is used for indicating at least one of the following: the first terminal supports Uu link condition switching; the first terminal supports relay link condition switching.

Optionally, as an embodiment, before the network side device sends the reconfiguration signaling for conditional handover, the method further includes: the network side equipment sends a measurement configuration signaling of condition switching; wherein the measurement configuration signaling comprises a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following conditions.

Optionally, as an embodiment, the method further includes: and the network side equipment sends a switching request message to target network side equipment, wherein the switching request message is used for determining the configuration information of the first terminal in the switched target link.

Optionally, as an embodiment, the handover request message further includes at least one of the following: configuration information of the first terminal in a link before switching; information of the target network node and/or the target relay node that satisfies the conditional handover execution condition.

Optionally, as an embodiment, the method further includes: the network side equipment and the target network side equipment execute at least one of the following steps: transferring the state of the serial number; and (4) forwarding data.

In order to describe the condition switching method provided in the embodiments of the present application in detail, the following description will be made with reference to several specific embodiments.

Example one

This embodiment mainly introduces a case where a Uu link terminal is switched to a relay link provided by a relay terminal (or referred to as a relay node) through conditional handover.

The embodiment relates to a conditional handover process of remote terminal (remote UE) identity, that is, a UE is currently in a direct link with a network side device, and performs a direct Uu communication with a serving cell (serving cell) of the UE, where the terminal is a conventional Uu UE, and when the terminal meets a certain measurement reporting condition, the network may configure a conditional handover configuration for the UE, where the conditional handover configuration includes a configuration in which a relay terminal (relay UE) is used as a candidate node (candidate node). This embodiment may include the steps of:

step 0: the UE1 reports the capability information of the self conditional handover to its serving cell, and particularly for the capability of the relay link conditional handover, for example, the capability information includes at least one of the following:

1) UE1 supports normal Uu conditional handover: one possible setting is that when the UE supports the capability as a remote UE and supports normal Uu conditional handover, the UE is considered to support relay link conditional handover.

2) UE1 supports relay link conditional handover: in another method, an independent capability indication field is set for the relay link conditional switch.

3) UE1 both support: the above various ways may indicate that the UE1 can support normal Uu conditional handover and relay link conditional handover.

In this example, all UEs may be remote UEs and relay UEs that support relay link conditional handover, and if one of the UEs does not support relay link conditional handover, the relay link conditional handover may not be performed.

Step 1: the serving cell of UE1 configures measurement for it, where the measurement object may include measurement for surrounding relay UEs as follows:

1) The measurement for relay UE may have a certain threshold, for example, UE1 starts to measure the peripheral relay UE only when the Uu RSRP of the UE is lower than a threshold 1.

2) The measurement of relay UEs may not require a threshold, i.e. the UE performs measurements of surrounding relay UEs at any time.

3) The measurement reporting for the relay UE may be periodic or event-triggered, for example, the measurement result reporting is performed only when the PC5/discovery RSRP between the UE1 and the relay UE is higher than a certain threshold.

4) The measurement of the relay UE may be based on a discovery (discovery) signal only, a data (data) signal, or any selected one of them, or both.

Step 2: and the UE1 executes measurement according to the measurement configuration of the network, and when the measurement reporting condition is met, the UE1 reports the measurement result to the network.

And step 3: the serving base station receives the measurement report result of the UE1, and if it is found that the configuration requirement of conditional handover is satisfied, for example, the current Uu link of the UE1 is not good, the Uu RSRP is lower than a certain threshold, and there are alternative available relay UEs 2 around the UE1 that can provide potential relay link transmission for the relay UEs, the relay UEs 2 may be considered as candidate nodes (candidate nodes) thereof.

If the candied relay UE2 is under the control of the same serving gNB (meaning that the serving gNB of UE1 and the serving gNB of UE2 are the same), in the most direct case, the candied relay UE2 is a connected UE under the same serving gNB, then at this time the serving gNB can directly send the reconfiguration signaling to the relay UE2 through a dedicated RRC procedure (dedicated RRC procedure), and the signaling content may include at least one of the following:

1) The identification information of UE1, for example, PC5 Layer-2ID, and/or the Uu ID of UE 1.

2) The relay link of the UE1 is established, and the bearer information and the Uu RLC bearer information that need to be added in the Uu air interface of the relay UE, and the mapping relationship between the End-to-End E2E (End-to-End) Radio bearer RB (Radio bearer) of the UE1 and the Uu RLC bearer are added.

3) The relay Link of UE1 is established, where bearer information and PC5 RLC bearer information need to be added in a PC5 interface of the relay UE, and optionally, a mapping relationship between an End-to-End E2E (End-to-End) Radio bearer RB (Radio bearer) and the PC5 RLC bearer is established, and if there is no mapping information, one-to-one in-sequence mapping is defaulted.

After the relay UE2 returns the reconfiguration complete signaling, the network side knows that the relay UE2 has configured the relay link serving the remote UE 1.

And 4, step 4: the service base station sends reconfiguration signaling of conditional switching to the remote UE1, wherein the reconfiguration signaling comprises at least one of the following:

1) Conventional candidate cell information, associated configuration and corresponding conditional switch execution criteria may be included.

2) Contains candidate relay information, mainly relay UE ID, such as PC5 layer-2ID of relay UE, and/or Uu ID (S-TMSI, C-RNTI, I-RNTI) of relay UE;

3) Configuration information related to the candidate relay, such as the PC5 RLC bearer configuration, the mapping relationship between the optional remote UE 1E 2E RB and the PC5 RLC bearer, etc., may be further included, and if there is no mapping relationship, one-to-one sequential mapping is default.

4) The execution criteria of conditional switch related to the candidate relay may also be included, for example, at least one of the following a-f:

a. uu satisfies RSRP below threshold 11.

b. PC5 satisfies RSRP above the threshold 21.

c. Both of the above conditions need to be satisfied simultaneously.

The RSRP may be replaced by RSRQ or SINR, CBR, etc., and since this group is an interference condition, the comparison with the threshold needs to be completely opposite to the RSRP.

d. Uu satisfies that RSRQ/SINR is above threshold 12.

e. PC5 satisfies RSRQ/SINR/CBR below threshold 22.

f. The above two conditions need to be satisfied simultaneously.

In general, RSRP, RSRQ, SINR, CBR only need to have one set of conditions.

In general, since a relay link is different from a Uu link, a conditional switch execution criterion of the relay link (candidate relay) is generally configured independently of a conditional switch execution criterion of the Uu link (candidate cell); in a very special case, multiplexing is not excluded, for example, the execution condition is a scenario where the link quality of the source cell is poor enough, that is, condition switching is performed, and at this time, the candidate is not evaluated, so that the two links do not show a difference.

It should be noted that the relay UE ID and the configuration are usually one-to-one, that is, one candidate relay UE is given a dedicated set of configurations, but the conditional handover of the candidate relay UE may have only one set of execution criteria, that is, all candidate relay UEs determine that the execution conditions are consistent, or may have one candidate relay UE or even one candidate relay UE, depending on the configuration and the requirements.

And 5: and the remote UE1 receives the reconfiguration signaling of the conditional switch, responds to the completion of the reconfiguration signaling of the conditional switch, and then starts to evaluate the conditional switch according to the execution criterion of the configured conditional switch.

And 6: when the remote UE1 finds that the relay UE1 satisfies the relay conditional handover execution criterion, the source cell connection may be disconnected, and the access to the relay link may include at least one of the following:

1) Through the Discovery process between remote UE1 and relay UE2, the basic relay architecture requirement is known first.

2) And then, establishing PC5 unified connection between the two UEs, activating safety, interaction capacity and the like, and preparing for subsequent communication.

3) Remote UE1 and relay UE2 interact and configure on the PC5 interface according to the configuration and mapping relationship of PC5 RLC bearer obtained from the base station, so as to achieve the consistency of the configurations at both ends, generally, the uplink data path is configured by Remote UE1, and the downlink data path is configured by relay UE2, which is based on the principle of configuring TX end on the PC5 interface, but it is not excluded that in the relay architecture, because the relay has more leading position, the relay can be configured by both relays, or each can be executed through the configuration given by gNB.

4) After the PC5 link is established, the remote UE1 sends a reconfiguration complete message to the target gNB through the PC5 link-relay UE 2-uulink, and according to the previous assumption, the target gNB is still unchanged and is the same gNB, but because the data path is changed, the gNB can know that the remote UE1 has completed access to the relay link according to the new data path, that is, the conditional switch process is completed, and can start data transmission on the new link, and if there are other candidate cells, can send a candidate signaling to inform the remote UE1 that the conditional switch is suspended/completed.

After the access through the new link, in this example, since the serving gbb is not changed, the PDCP security does not need update, and the procedure can be continued directly, for the E2E RLC AM RB, the status report can be triggered on the PDCP layer and then the retransmission operation according to the status report is performed, and the data missing caused by the path switching is recovered, thereby achieving the purpose of lossless switching.

Example two

The embodiment mainly introduces that the remote terminal is switched to the Uu link provided by the network node through conditional switching.

In this embodiment, it is assumed that the current service path of remote UE3 is an indirect link (indirect link), i.e. a path such as remote UE3- > relay UE4- > serving gbb. Since the remote UE is currently in a connected (connected) state, there is an active RRC connection (connection) between the remote UE and the serving gbb, UL/DL RRC signaling can be transmitted end-to-end. The method for the remote UE3 to perform conditional switch may include the following steps:

step 0: the remote UE3 needs to report the capability information of the base station itself regarding the conditional handover, wherein the capability information is the same as that shown in the first embodiment. In summary, the base station needs to know whether the UE3 supports the relay link conditional handover or the normal conditional handover (there is a possibility that the UE capability of supporting the normal conditional handover is enough since the target/candidate node is a legacy cell) to perform the corresponding conditional handover.

Step 1: the serving gNB of remote UE3 configures measurement for it, since this example relates to conditional handover with candidate as cell, the measurement configuration is similar to the existing one, and there is a difference that the Uu measurement for its serving cell still belongs to the neighbor cell measurement rather than the current cell measurement because remote UE3 is currently in relay link, which is a key point different from the normal measurement configuration.

Step 2: and the UE3 executes measurement according to the measurement configuration of the network, and when the measurement reporting condition is met, the UE3 reports the measurement result to the network.

And 3, step 3: the serving base station receives the measurement report result of the UE3, and if it is found that the configuration requirement of the conditional handover is satisfied, for example, the current Relay link of the UE3 is not good, the RSRP of the PC5 is lower than a certain threshold, and there are alternative available cells around the UE3 to provide potential uulink transmission for the UE3, the cell may be considered as the candidate node thereof, and it should be noted that the candidate node may be a serving cell of the current UE3 or another cell other than the serving cell at this time.

If the candidate cell is under the control of the same serving gbb (which means the same serving gbb as UE 3), the most direct case is that the candidate cell is under the same serving gbb, at this time the serving gbb can directly perform admission and configuration information generation in the candidate cell by internal operation.

And 4, step 4: the serving base station sends a reconfiguration signaling of conditional handover to the remote UE3, where the reconfiguration signaling includes candidate cell ID information and configuration information, and a conditional handover execution criterion.

And 5: the remote UE3 receives the reconfiguration signaling of conditional handover, completes the reconfiguration signaling of conditional handover in response to the completion of the reconfiguration signaling of conditional handover, and then starts to evaluate the conditional handover according to the execution criteria of the configured conditional handover.

Step 6: when the remote UE3 finds that the candidate cell satisfies the conditional handover execution criterion, the source relay link connection may be disconnected and the access may be made to the Uu link, which may include at least one of the following steps:

1) And initiating a random access process to the target cell.

2) And after the random access is successful, sending reconfiguration completion information.

3) And the base station side receives the configuration completion on the new link and knows that the UE has completed the conditional switch. A cancel instruction may be sent to other candidate cells or a relay link to stop the preparation and resource reservation of the relevant conditional switch.

4) The UE3 implements RLC bearer, or even PC5 connection, that releases the PC5 interface segment of the relay link.

EXAMPLE III

This embodiment describes a case where both the candidate cell and the candidate relay are allocated to the first terminal.

The above two embodiments describe two most basic procedures relating to conditional handover of a remote UE. In this embodiment, a more complicated situation is continuously described on the basis of the foregoing, and some of the same contents may refer to the foregoing embodiment, which is not described again.

When a UE is in Uu direct link directly communicating with its serving cell, or a remote UE is in index link and is connected to its serving cell through a relay UE, in both cases, the candidate network node (candidate cell) and the candidate relay node (candidate relay) can be configured simultaneously at the time of conditional handover configuration, and there are corresponding target configurations for each candidate node and respective conditional handover execution criteria for different types.

The present embodiment mainly introduces the selection behavior of the UE when one or more candidate cells and one or more candidate relays simultaneously satisfy the respective conditional handover execution criteria.

Because uulink and relay link have different characteristics, for example, uulink is connected by one hop, so that the resource utilization efficiency and the system efficiency are better, the deployment of the larger cell coverage is more scientific, the service coverage and continuity of the UE are better supported, and the relay link is vice versa, but the relay link has the advantages of being closer to the remote, bringing better power saving experience to the remote UE, and providing possibility for cooperative transmission between user equipments, one of the following modes can be adopted:

mode 1: when the candidate cell(s) and the candidate relay(s) simultaneously satisfy the respective condition switch execution criteria, the target node is preferentially selected in the candidate cell(s), and if there are multiple cells, which cell can be handed to the UE for implementation is specifically selected, for example, the beam condition, beam quality and other factors are considered.

Mode 2: when the candidate cell(s) and the candidate Relay(s) simultaneously satisfy the respective condition switch execution criteria, the target node is preferentially selected from the candidate Relay(s), and if there are multiple relays, which Relay can be given to the UE for implementation is specifically selected, for example, factors such as distance, channel conditions, relay capabilities, and even binding and home relations between devices (for example, between a mobile phone and a wearable device belonging to the same user) are considered.

Mode 3: when the UE is more inclined to the traffic performance, according to the mode 1, and when the UE is more inclined to the power saving performance, according to the mode 2.

Mode 4: the network side decides to use mode 1 or mode 2 through configuration, wherein the configuration mode can be pre-configuration signaling, SIB signaling, dedicated signaling, etc.

Since the above modes have merits and disadvantages, other dimensions or conditions may be further introduced to assist the selection of the target node, for example, at least one of the following may be included:

1) A Uu link quality condition, wherein when Uu RSRP is higher than a threshold or RSRQ/SINR is lower than a threshold, candidate cells(s) need to be preferentially selected, and if there are multiple cells, which cell can be handed to the UE for implementation is specifically selected, for example, consideration is given to beam conditions, beam quality and other factors; otherwise, candidate Relay(s) is preferentially selected, and if there are multiple relays, which Relay can be given to the UE for implementation is specifically selected, for example, considering factors such as distance, channel condition, relay capability, and even binding and attribution relationship between devices (for example, between a mobile phone and a wearable device belonging to the same user).

2) The method includes the steps that (1) the PC5 link quality condition is adopted, when the RSRP of the PC5 is higher than a threshold or the RSRQ/CBR is lower than the threshold, candidate Relay(s) are preferentially selected, if multiple relays exist, the specific Relay can be given to the UE for realization, and factors such as distance, channel conditions, relay capabilities, binding and home relations among devices (for example, between a mobile phone and a wearable device belonging to the same user) and the like are considered; otherwise, candidate cells(s) need to be selected preferentially, and if there are multiple cells, which cell can be handed to the UE for implementation is specifically selected, for example, the beam condition, beam quality and other factors are considered.

3) The combined condition between the two groups is that when Uu RSRP is higher than the threshold or RSRQ/SINR is lower than the threshold and PC5 RSRP is lower than the threshold or RSRQ/CBR is higher than the threshold, candidate cell(s) is selected preferentially, otherwise, candidate relay(s) is selected preferentially.

4) Combining conditions, preferentially selecting candidate relay(s) when PC5 RSRP is higher than a threshold or RSRQ/CBR is lower than a threshold and Uu RSRP is lower than a threshold or RSRQ/SINR is higher than a threshold, and preferentially selecting candidate cell(s) otherwise.

5) Considering load and other factors, etc., when the Uu load is lower than the threshold and/or the relay load is higher than the threshold and/or the relay UE power is lower than the threshold, the candidate cell(s) is preferentially selected, otherwise, the candidate cell(s) is preferentially selected.

6) Considering load and other factors, when the Uu load is higher than the threshold and/or the relay load is lower than the threshold and/or the relay UE power is higher than the threshold, the candidate relay(s) is selected preferentially, otherwise, the candidate relay(s) is selected preferentially.

7) The network may not specify any selection rules at all, leaving it to the UE to implement, and the UE selects according to its own preferences and algorithms.

Example four

The embodiment relates to cross-base station condition switching, and mainly introduces the interaction process (Xn interface/intra-gNB/inter-gNB) of the network side equipment and the target network side equipment

In the foregoing embodiments, most of the scenarios related to intra-gNB are that the source node and the target node are under the control of the same base station, and therefore interface interaction between base stations is not required. Another large category of scenarios is inter-gNB, i.e. the source node and the target node are under the control of different base stations, and at this time, the interface interaction between the base stations needs to be considered.

It should be noted that, because the time is limited in the SL Relay R17 project research process, some more complex scenarios are not supported in the first version, for example, inter-gNB handover of remote UE is not supported, handover of remote UE from Relay link1 to Relay link2 is not supported, and the like. Then since the handover scenario itself is limited, it is reasonable to assume that the handover scenario does not support, and then the conditional handover scenario does not support. In order to avoid these unsupported condition switching scenarios, the implementation algorithm of the base station is used to avoid the scenario, for example, the base station does not configure a remote UE with a configuration of condition switching between the inter-gNB or two relay links, or the implementation algorithm of the base station may also be used to avoid the scenario, for example, when the UE reports, the UE does not report the measurement result of the inter-gNB or two relay links, or when the network side configures an unsupported switching scenario, the UE does not select an unsupported candidate node as a target node.

In this embodiment, an example in which a remote UE is switched from relay UE1/cell1 under the gNB1 to cell2/relay UE2 under the gNB2 is taken as an example, to describe an interface process between base stations in a base station crossing scenario.

Firstly, in the stage of measurement configuration, if no restriction is made, the configuration of the serving base station is to measure all the neighboring cells, and the UE reports when the measurement conditions of the neighboring cells are satisfied, so that the measurement results of the neighboring cells satisfying the conditions may have both the cell of the intra-gNB and the cell of the inter-gNB, and the UE reports the measurement results together without distinguishing, and performs algorithm selection by the network.

The measurement of the relay is similar, the measurement configuration and measurement reporting stage can comprise the relay measurement result under intra-gNB and the relay measurement result under inter-gNB, UE reports the relay measurement results together without distinction, and the network selects the algorithm.

Secondly, when the network selects a cross-base station cell or relay as a candidate node, the source base station needs to send a handover request (handover request) signaling to the target base station, and negotiate about admission and new configuration of the remote UE on the new link, wherein the handover request signaling also needs to carry all the configurations of the remote UE on the source link for reference by the target node, so as to maintain the best service continuity effect of the original configuration on the UE as much as possible. For example, if the source link is a relay link, the handover request may carry not only the remote UE end-to-end bearer configuration and each layer configuration, but also the PC5 link configuration and the mapping relationship of the end-to-end bearer in the PC5 RLC bearer. But there is also a simplified way to carry only the remote UE end-to-end PDCP and above configuration, and there is a one-to-one in-sequence mapping between the default PC5 RLC bearer and the end-to-end bearer.

The Handover request signaling may also carry target node information meeting the conditions, such as a target cell ID or a target relay UE ID, where the target relay may also carry serving cell information of the relay, so that the target base station may find a correct relay UE.

And when the target gNB receives the Handover request message, admission and configuration are carried out, if the cell is the cell, the gNB can directly carry out the admission and configuration, if the cell is the relay UE, the target gNB optionally needs to configure a new configuration for a plurality of relay nodes, and after the success, the target gNB returns Handover request acknowledgement to the source node, and all configurations of the new nodes are carried.

The source node receives the configuration of the target side, generally more than one target node is configured in the process of conditional switching, the source node organizes the configuration of the target side, forms a reconfiguration signaling of the conditional switching, carries the conditional switching execution criteria of each type of target node, and sends the reconfiguration signaling to the remote UE together.

And the Remote UE receives the condition switching signaling and returns a completion response. And starting to evaluate candidate nodes, selecting the candidate node as a target node after a node meeting the execution criterion exists, initiating the detach to the source, accessing to the target, and sending a reconfiguration completion signaling.

The target side informs the source that the source is correctly accessed, the source cancel loses other alternative nodes, and the conditional switch is completed.

Certain early SN status transfer and early data forwarding can be performed between two gNBs, and the concurrent execution is performed in the Xn process of condition switching, so that the method has the advantages of preparing for the access of the UE in advance, and is particularly beneficial to low-delay and high-reliability services. Or after the UE really accesses the target node, the target node requests the SN status transfer and data forwarding from the source node, and the latter mode is more targeted and has higher resource utilization rate and network efficiency. Which kind of node is used, the negotiation decision in the source node and the target node can be made according to the service characteristics, the load capacity conditions of the source node and the target node, and the like.

The purpose of the SN status transfer and data forwarding is to ensure the service reliability of the UE for the service continuity of the UE handover process.

It should be noted that, in the condition switching method provided in the embodiment of the present application, the execution main body may be a condition switching device, or a control module used for executing the condition switching method in the condition switching device. In the embodiment of the present application, a condition switching device executing a condition switching method is taken as an example, and the condition switching device provided in the embodiment of the present application is described.

Fig. 4 is a schematic structural diagram of a condition switching apparatus according to an embodiment of the present application, which may correspond to a terminal in other embodiments. As shown in fig. 4, the apparatus 400 includes the following modules.

A receiving module 402, configured to receive a reconfiguration signaling for conditional switching; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

The conditional switching module 404 may be configured to perform a conditional switching procedure according to the reconfiguration signaling.

In this embodiment of the present application, the reconfiguration signaling received by the apparatus 400 includes a candidate node, where the candidate node includes a network node and/or a relay node, so that the first terminal may switch to the network node or the relay node, which can solve the problem in the related art that a handover process is performed due to a condition related to a sidelink relay scenario is not supported, and improve a handover success rate of the terminal.

Optionally, as an embodiment, in a case that the apparatus is a remote terminal, the candidate node includes the network node and/or the relay node; or in the case that the apparatus is a Uu link terminal, the candidate node includes one of: the network node and the relay node; the relay node.

Optionally, as an embodiment, the condition switching module 404 may be configured to: and under the condition that a target relay node in the candidate nodes meets the second conditional handover execution condition, disconnecting the source network node or the source relay node and accessing a relay link provided by the target relay node.

Optionally, as an embodiment, the condition switching module 404 may be configured to: performing a discovery process with the target relay node; establishing PC5 connection with the target relay node; the reconfiguration complete message is sent over the PC5 link.

Optionally, as an embodiment, the condition switching module 404 may be configured to: and under the condition that a target network node in the candidate nodes meets the first conditional handover execution condition, disconnecting the target network node from a source relay node, and accessing a Uu link provided by the target network node.

Optionally, as an embodiment, the conditional switching module 404 may be configured to: releasing Radio Link Control (RLC) bearing of a PC5 interface between the source relay node and the source relay node; releasing the PC5 connection with the source relay node.

Optionally, as an embodiment, the reconfiguration signaling includes a condition switching execution condition, and the condition switching module 404 may be configured to: when M network nodes and N relay nodes simultaneously meet respective condition switching execution conditions, selecting a target network node from the M network nodes or selecting a target relay node from the N relay nodes according to a preset rule; wherein M and N are positive integers.

Optionally, as an embodiment, the preset rule may include one of the following.

1) Preferentially selecting a target network node from the M network nodes.

2) And preferentially selecting a target relay node from the N relay nodes.

3) And preferentially selecting a target network node from the M network nodes under the condition that the requirement of the device on the service performance meets a first condition.

4) And preferentially selecting a target relay node from the N relay nodes when the requirement of the device on the power saving performance meets a second condition.

Optionally, as an embodiment, the apparatus 400 further includes a sending module, which may be configured to: sending capability information of condition switching, wherein the capability information is used for indicating at least one of the following: the device supports Uu link condition handover; the apparatus supports relay link condition handover.

Optionally, as an embodiment, the receiving module 402 may be configured to receive a measurement configuration signaling for conditional handover; wherein the measurement configuration signaling comprises a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following conditions:

1) Starting to measure relay nodes in the candidate nodes under the condition that the Uu link quality is lower than a third threshold;

2) The measurement result of the relay node in the candidate nodes is reported periodically or is reported triggered by an event;

3) Measuring relay nodes of the candidate nodes based on discovery signals and/or data signals.

The apparatus 400 according to the embodiment of the present application may refer to the flow corresponding to the method 200 according to the embodiment of the present application, and each unit/module and the other operations and/or functions described above in the apparatus 400 are respectively for implementing the corresponding flow in the method 200 and achieving the same or equivalent technical effects, and are not described herein again for brevity.

The condition switching device in the embodiment of the present application may be a device, a device or an electronic device having an operating system, or may be a component, an integrated circuit, or a chip in a terminal. The device or the electronic equipment can be a mobile terminal or a non-mobile terminal. For example, the mobile terminal may include, but is not limited to, the above-listed type of terminal 11, and the non-mobile terminal may be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a Television (TV), a teller machine, a kiosk, or the like, and the embodiments of the present application are not limited in particular.

The condition switching device provided in the embodiment of the present application can implement each process implemented by the method embodiments of fig. 2 to fig. 3, and achieve the same technical effect, and is not described herein again to avoid repetition.

Fig. 5 is a schematic structural diagram of a conditional switching apparatus according to an embodiment of the present application, where the apparatus may correspond to a network-side device in another embodiment. As shown in fig. 5, the apparatus 500 includes the following modules.

A sending module 502, configured to send a reconfiguration signaling for conditional switching, where the reconfiguration signaling is used for a first terminal to execute a conditional switching process; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

In the conditional handover method provided in the embodiment of the present application, the device 500 sends the reconfiguration signaling for conditional handover, where the reconfiguration signaling includes a candidate node, and the candidate node includes a network node and/or a relay node, so that the first terminal may be handed over to the network node or the relay node, which can solve the problem in the related art that a conditional handover process related to a sidelink relay scenario is not supported, and improve the handover success rate of the terminal.

Optionally, as an embodiment, in a case that the first terminal is a remote terminal, the candidate node includes the network node and/or the relay node; or in the case that the first terminal is a Uu link terminal, the candidate node includes one of: the network node and the relay node; the relay node.

Optionally, as an embodiment, the reconfiguration signaling includes a conditional handover execution condition, and the reconfiguration signaling is used for the first terminal to perform the following procedures: when M network nodes and N relay nodes simultaneously meet respective condition switching execution conditions, selecting a target network node from the M network nodes or selecting a target relay node from the N relay nodes according to a preset rule; wherein M and N are positive integers.

Optionally, as an embodiment, the preset rule may include one of the following.

1) Preferentially selecting a target network node from the M network nodes.

2) And preferentially selecting a target relay node from the N relay nodes.

Optionally, as an embodiment, the apparatus 500 further includes a receiving module, which may be configured to receive capability information of the conditional handover, where the capability information is used to indicate at least one of the following: the first terminal supports Uu link condition switching; the first terminal supports relay link condition handover.

Optionally, as an embodiment, the sending module 502 may be further configured to send a measurement configuration signaling for conditional switching; wherein the measurement configuration signaling comprises a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following conditions.

Optionally, as an embodiment, the sending module 502 may be further configured to send a handover request message to the target network side device, where the handover request message is used to determine configuration information of the first terminal in the target link after handover.

Optionally, as an embodiment, the apparatus 500 may be further configured to perform, with the target network side device, at least one of the following: transferring the state of the serial number; and (4) forwarding data.

The apparatus 500 according to the embodiment of the present application may refer to the flow corresponding to the method 300 of the embodiment of the present application, and each unit/module and the other operations and/or functions described above in the apparatus 500 are respectively for implementing the corresponding flow in the method 300 and achieving the same or equivalent technical effects, and are not described herein again for brevity.

Optionally, as shown in fig. 6, an embodiment of the present application further provides a communication device 600, which includes a processor 601, a memory 602, and a program or an instruction stored in the memory 602 and executable on the processor 601, for example, when the communication device 600 is a terminal, the program or the instruction is executed by the processor 601 to implement each process of the foregoing conditional access method embodiment, and the same technical effect can be achieved. When the communication device 600 is a network-side device, the program or the instruction is executed by the processor 601 to implement the processes of the above-mentioned conditional switching method embodiment, and the same technical effect can be achieved.

The embodiment of the present application further provides a terminal, including a processor and a communication interface, where the processor is configured to execute a condition switching process according to the reconfiguration signaling, and the communication interface is configured to receive the reconfiguration signaling for the condition switching; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes. The terminal embodiment corresponds to the terminal-side method embodiment, and all implementation processes and implementation manners of the method embodiment can be applied to the terminal embodiment and can achieve the same technical effect. Specifically, fig. 7 is a schematic diagram of a hardware structure of a terminal for implementing the embodiment of the present application.

The terminal 700 includes, but is not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709, a processor 710, and the like.

Those skilled in the art will appreciate that the terminal 700 may further include a power supply (e.g., a battery) for supplying power to various components, which may be logically connected to the processor 710 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system. The terminal structure shown in fig. 7 does not constitute a limitation of the terminal, and the terminal may include more or less components than those shown, or combine some components, or have a different arrangement of components, and will not be described again here.

It should be understood that in the embodiment of the present application, the input Unit 704 may include a Graphics Processing Unit (GPU) 7041 and a microphone 7042, and the Graphics Processing Unit 7041 processes image data of still pictures or videos obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 706 may include a display panel 7061, and the display panel 7061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 707 includes a touch panel 7071 and other input devices 7072. The touch panel 7071 is also referred to as a touch screen. The touch panel 7071 may include two parts of a touch detection device and a touch controller. Other input devices 7072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be described in further detail herein.

In the embodiment of the present application, the radio frequency unit 701 receives downlink data from a network side device and then processes the downlink data in the processor 710; in addition, the uplink data is sent to the network side equipment. In general, radio frequency unit 701 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 709 may be used to store software programs or instructions as well as various data. The memory 709 may mainly include a storage program or instruction area and a storage data area, wherein the storage program or instruction area may store an operating system, an application program or instruction (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like. In addition, the Memory 709 may include a high-speed random access Memory and a non-transitory Memory, wherein the non-transitory Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable Programmable PROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), or a flash Memory. Such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device.

Processor 710 may include one or more processing units; alternatively, processor 710 may integrate an application processor that handles primarily the operating system, user interface, and application programs or instructions, etc. and a modem processor that handles primarily wireless communications, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into processor 710.

The radio frequency unit 701 may be configured to perform a conditional handover procedure according to the reconfiguration signaling.

A processor 710, configured to receive reconfiguration signaling for conditional switching; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

In this embodiment of the present application, the reconfiguration signaling received by the terminal 700 includes a candidate node, where the candidate node includes a network node and/or a relay node, so that the first terminal may switch to the network node or the relay node, which can solve the problem in the related art that a conditional switching process related to a secondary link relay scenario is not supported, and improve the success rate of switching the terminal.

The terminal 700 provided in this embodiment of the present application may also implement each process of the foregoing condition switching method embodiment, and may achieve the same technical effect, and for avoiding repetition, details are not described here again.

The embodiment of the present application further provides a network side device, which includes a processor and a communication interface, where the communication interface is configured to send a reconfiguration signaling for conditional switching, and the reconfiguration signaling is used for a first terminal to execute a conditional switching process; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes. The embodiment of the network side device corresponds to the embodiment of the method of the network side device, and all implementation processes and implementation manners of the embodiment of the method can be applied to the embodiment of the network side device and can achieve the same technical effect.

Specifically, the embodiment of the application further provides a network side device. As shown in fig. 8, the network-side device 800 includes: antenna 81, radio frequency device 82, baseband device 83. The antenna 81 is connected to a radio frequency device 82. In the uplink direction, the rf device 82 receives information via the antenna 81 and sends the received information to the baseband device 83 for processing. In the downlink direction, the baseband device 83 processes information to be transmitted and transmits the information to the rf device 82, and the rf device 82 processes the received information and transmits the processed information through the antenna 81.

The above-mentioned band processing means may be located in the baseband device 83, and the method performed by the network side device in the above embodiment may be implemented in the baseband device 83, where the baseband device 83 includes a processor 84 and a memory 85.

The baseband device 83 may include, for example, at least one baseband board, on which a plurality of chips are disposed, as shown in fig. 8, where one of the chips, for example, the processor 84, is connected to the memory 85 to call up the program in the memory 85 to perform the network side device operation shown in the above method embodiment.

The baseband device 83 may further include a network interface 86 for exchanging information with the radio frequency device 82, such as a Common Public Radio Interface (CPRI).

Specifically, the network side device in the embodiment of the present application further includes: the instructions or programs stored in the memory 85 and executable on the processor 84, and the processor 84 calls the instructions or programs in the memory 85 to execute the methods executed by the modules shown in fig. 5, and achieve the same technical effects, which are not described herein for avoiding repetition.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the foregoing conditional switching method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

The processor may be the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.

The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement each process of the foregoing condition switching method embodiment, and can achieve the same technical effect, and the details are not repeated here to avoid repetition.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip or a system-on-chip.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a computer software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (e.g., a mobile phone, a computer, a server, an air conditioner, or a network-side device) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A conditional access method, comprising:

the first terminal receives a reconfiguration signaling of the conditional switching CHO; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes;

and the first terminal executes a conditional switching process according to the reconfiguration signaling.

2. The method of claim 1,

in the case that the first terminal is a remote terminal, the candidate node comprises the network node and/or the relay node;

in a case that the first terminal is a user network universal interface Uu link terminal, the candidate node includes one of: the network node and the relay node; the relay node.

3. The method according to claim 1 or 2, wherein the reconfiguration signalling comprises at least one of:

information of the network node; configuration information of the network node; a first condition switch execution condition corresponding to the network node; information of the relay node; configuration information of the relay node; and a second condition corresponding to the relay node switches the execution condition.

4. The method of claim 3, wherein the second conditional switch execution condition comprises at least one of:

the link quality of the Uu link is lower than a first threshold;

the link quality of the relay link is above a second threshold.

5. The method of claim 3,

the first conditional switch execution condition and the second conditional switch execution condition are configured independently; or

The second conditional switch execution condition multiplexes the first conditional switch execution condition.

6. The method of claim 3, wherein the first terminal performing a conditional handover procedure according to the reconfiguration signaling comprises:

and under the condition that a target relay node in the candidate nodes meets the second conditional handover execution condition, the first terminal disconnects the source network node or the source relay node and accesses a relay link provided by the target relay node.

7. The method of claim 6, wherein the accessing the relay link provided by the target relay node comprises at least one of:

performing a discovery process with the target relay node;

establishing PC5 connection with the target relay node;

the reconfiguration complete message is sent over the PC5 link.

8. The method of claim 3, wherein the first terminal performing a conditional handover procedure according to the reconfiguration signaling comprises:

and under the condition that a target network node in the candidate nodes meets the first conditional handover execution condition, the first terminal disconnects with a source relay node and accesses a Uu link provided by the target network node.

9. The method of claim 8, further comprising at least one of:

releasing Radio Link Control (RLC) bearing of a PC5 interface between the source relay node and the source relay node;

releasing the PC5 connection with the source relay node.

10. The method of claim 1, wherein the reconfiguration signaling comprises a conditional handover execution condition, and wherein the performing a conditional handover procedure according to the reconfiguration signaling comprises:

when M network nodes and N relay nodes simultaneously meet respective condition switching execution conditions, selecting a target network node from the M network nodes or selecting a target relay node from the N relay nodes according to a preset rule;

wherein M and N are positive integers.

11. The method of claim 10, wherein the preset rule comprises one of:

preferentially selecting a target network node from the M network nodes;

preferentially selecting a target relay node from the N relay nodes;

preferentially selecting a target network node from the M network nodes under the condition that the requirement of the first terminal on service performance meets a first condition;

preferentially selecting a target relay node from the N relay nodes under the condition that the requirement of the first terminal on the power saving performance meets a second condition;

and preferentially selecting a target network node from the M network nodes or preferentially selecting a target relay node from the N relay nodes according to configuration determination.

12. The method of claim 11, wherein the preset rules further comprise at least one of: uu link quality condition, PC5 link quality condition, uu link load condition, PC5 link load condition, and power condition of the N relay nodes.

13. The method of claim 11, wherein the selecting a target relay node from the N relay nodes comprises:

selecting a target relay node from the N relay nodes according to at least one of the following conditions: distance, channel conditions, relay capabilities, binding and affiliation between terminals.

14. The method of claim 1, wherein before the first terminal receives the reconfiguration signaling for the conditional handover, the method further comprises:

the first terminal sends capability information of conditional switching, wherein the capability information is used for indicating at least one of the following: the first terminal supports Uu link condition switching; the first terminal supports relay link condition handover.

15. The method of claim 14, wherein after the step of the first terminal sending capability information for conditional handover and before the step of the first terminal receiving reconfiguration signaling for conditional handover, the method further comprises: the first terminal receives a measurement configuration signaling of condition switching; wherein the measurement configuration signaling comprises a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following conditions:

under the condition that the Uu link quality is lower than a third threshold, the first terminal starts to measure the relay nodes in the candidate nodes;

the measurement result of the first terminal to the relay node in the candidate nodes is reported periodically or is reported triggered by an event;

the first terminal measures relay nodes in the candidate nodes based on discovery signals and/or data signals.

16. A conditional access method, comprising:

the network side equipment sends a reconfiguration signaling of the condition switching, wherein the reconfiguration signaling is used for the first terminal to execute the condition switching process; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

17. The method of claim 16,

in a case that the first terminal is a Uu link terminal, the candidate node includes one of: the network node and the relay node; the relay node.

18. The method according to claim 16 or 17, wherein the reconfiguration signalling comprises at least one of:

19. The method of claim 18, wherein the second conditional switch execution condition comprises at least one of:

the link quality of the Uu link is lower than a first threshold;

the link quality of the relay link is higher than the second threshold.

20. The method of claim 18,

21. The method of claim 16, wherein the reconfiguration signaling includes a conditional handover execution condition, and wherein the reconfiguration signaling is used for the first terminal to perform the following procedures:

wherein M and N are positive integers.

22. The method of claim 21, wherein the predetermined rule comprises one of:

preferentially selecting a target network node from the M network nodes;

preferentially selecting a target relay node from the N relay nodes;

23. The method of claim 22, wherein the preset rules further comprise at least one of: uu link quality condition, PC5 link quality condition, uu link load condition, PC5 link load condition, and power condition of the N relay nodes.

24. The method of claim 22, wherein the selecting the target relay node from the N relay nodes comprises:

25. The method of claim 16, wherein before the network side device sends the reconfiguration signaling for the conditional handover, the method further comprises:

the network side equipment receives capability information of condition switching, wherein the capability information is used for indicating at least one of the following: the first terminal supports Uu link condition switching; the first terminal supports relay link condition handover.

26. The method of claim 25, wherein before the network side device sends the reconfiguration signaling for the conditional handover, the method further comprises: the network side equipment sends a measurement configuration signaling of condition switching; wherein the measurement configuration signaling comprises a measurement restriction condition, and the measurement restriction condition satisfies at least one of the following conditions:

27. The method of claim 16, further comprising:

and the network side equipment sends a switching request message to target network side equipment, wherein the switching request message is used for determining the configuration information of the first terminal in the switched target link.

28. The method of claim 27, wherein the handover request message further comprises at least one of:

configuration information of the first terminal in a link before switching;

information of target network nodes and/or target relay nodes that meet the conditional handover execution conditions.

29. The method of claim 28, further comprising: the network side equipment and the target network side equipment execute at least one of the following steps:

transferring the state of the serial number;

and (4) forwarding data.

30. A condition switching apparatus, comprising:

a receiving module, configured to receive a reconfiguration signaling for conditional switching; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes;

and the condition switching module is used for executing the condition switching process according to the reconfiguration signaling.

31. The apparatus of claim 30,

in the case that the apparatus is a remote terminal, the candidate node comprises the network node and/or the relay node;

in a case where the apparatus is a Uu link terminal, the candidate node includes one of: the network node and the relay node; the relay node.

32. A condition switching apparatus, comprising:

a sending module, configured to send a reconfiguration signaling for conditional switching, where the reconfiguration signaling is used for a first terminal to perform a conditional switching process; wherein the reconfiguration signaling comprises information related to candidate nodes, and the candidate nodes comprise network nodes and/or relay nodes.

33. The method of claim 32,

34. A terminal comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the conditional switching method of any of claims 1 to 15.

35. A network-side device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the conditional switching method according to any one of claims 16 to 29.

36. A readable storage medium, characterized in that a program or instructions are stored thereon, which when executed by a processor implement the conditional switching method according to any one of claims 1 to 15, or the conditional switching method according to any one of claims 16 to 29.