CN113873600A

CN113873600A - Method, device, terminal, storage medium and program product for switching sidelink

Info

Publication number: CN113873600A
Application number: CN202111385258.4A
Authority: CN
Inventors: 高鸣
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2021-12-31
Anticipated expiration: 2041-11-22
Also published as: CN113873600B; WO2023087907A1

Abstract

The embodiment of the application discloses a method, a device, a terminal, a storage medium and a program product for switching a sidelink, and belongs to the technical field of communication. The method comprises the following steps: responding to a first measurement report received from a remote terminal, and determining a second relay terminal, wherein the second relay terminal is a relay terminal meeting the first measurement event corresponding to the first measurement report; acquiring a second sidelink configuration parameter from the second relay terminal; and sending a sidelink reconfiguration message containing a second sidelink configuration parameter to the remote terminal so that the remote terminal disconnects the sidelink with the first relay terminal when the second relay terminal meets a second measurement event, and establishes and configures the sidelink with the second relay terminal based on the second sidelink configuration parameter. In the embodiment of the application, under the scene that the remote terminal moves, the speed of the remote terminal for rebuilding the sidelink and recovering data transmission is improved, and the influence of the movement of the remote terminal on the data transmission is reduced.

Description

Method, device, terminal, storage medium and program product for switching sidelink

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method, an apparatus, a terminal, a storage medium, and a program product for switching a sidelink.

Background

Sidelink (sidelink) communication is a technology in which a relay (relay) terminal directly establishes connection with a remote (remote) terminal by using a New Ratio (NR) spectrum resource and an access technology, thereby performing application layer data transmission.

In the related art, when the sidelink between the remote terminal and the relay terminal is disconnected due to movement, the remote terminal needs to detect other relay terminals around again, so as to reestablish the sidelink with other relay terminals, and further resume data transmission.

Disclosure of Invention

The embodiment of the application provides a method, a device, a terminal, a storage medium and a program product for switching a sidelink. The technical scheme is as follows:

in one aspect, an embodiment of the present application provides a method for switching a sidelink, where the method is used for a first relay terminal, and the method includes:

responding to a first measurement report received from a remote terminal, and determining a second relay terminal, wherein the second relay terminal is a relay terminal meeting a first measurement event corresponding to the first measurement report;

acquiring a second sidelink configuration parameter from the second relay terminal, wherein the second sidelink configuration parameter is a configuration parameter applied to a sidelink between the remote terminal and the second relay terminal;

and sending a sidelink reconfiguration message containing the second sidelink configuration parameter to the remote terminal, so that the remote terminal disconnects a sidelink with the first relay terminal when the second relay terminal meets a second measurement event, and establishes and configures the sidelink with the second relay terminal based on the second sidelink configuration parameter.

In another aspect, an embodiment of the present application provides a method for handover of a sidelink, where the method is used for a remote terminal, and the method includes:

responding to a second relay terminal meeting a first measurement event, reporting a first measurement report to a first relay terminal, wherein a side link is established between the remote terminal and the first relay terminal;

receiving a sidelink reconfiguration message sent by the first relay terminal, wherein the sidelink reconfiguration message includes a second sidelink configuration parameter acquired from the second relay terminal, and the second sidelink configuration parameter is a configuration parameter applied to a sidelink between the remote terminal and the second relay terminal;

in response to the second relay terminal satisfying a second measurement event, disconnecting a sidelink with the first relay terminal;

and establishing and configuring a sidelink with the second relay terminal based on the second sidelink configuration parameter.

In another aspect, an embodiment of the present application provides a method for handover of a sidelink, where the method is used for a second relay terminal, and the method includes:

determining a second sidelink configuration parameter, wherein the second sidelink configuration parameter is a configuration parameter applied to a sidelink between a remote terminal and the second relay terminal;

sending the second sidelink configuration parameter to a first relay terminal, wherein the first relay terminal and a remote terminal establish a sidelink;

and under the condition that the side link between the remote terminal and the first relay terminal is disconnected, establishing and configuring the side link with the remote terminal.

In another aspect, an embodiment of the present application provides a device for switching a sidelink, where the device is used for a first relay terminal, and the device includes:

the determining module is used for responding to a first measurement report received from a remote terminal, and determining a second relay terminal, wherein the second relay terminal is a relay terminal meeting the requirement that the first measurement report corresponds to a first measurement event;

an obtaining module, configured to obtain a second sidelink configuration parameter from the second relay terminal, where the second sidelink configuration parameter is a configuration parameter applied to a sidelink between the remote terminal and the second relay terminal;

a sending module, configured to send a sidelink reconfiguration message including the second sidelink configuration parameter to the remote terminal, so that the remote terminal disconnects a sidelink with the first relay terminal when the second relay terminal meets a second measurement event, and establishes and configures a sidelink with the second relay terminal based on the second sidelink configuration parameter.

In another aspect, an embodiment of the present application provides a device for switching a sidelink, where the device is used for a remote terminal, and the device includes:

a reporting module, configured to report a first measurement report to a first relay terminal in response to a second relay terminal meeting a first measurement event, where a sidelink is established between the remote terminal and the first relay terminal;

a receiving module, configured to receive a sidelink reconfiguration message sent by the first relay terminal, where the sidelink reconfiguration message includes a second sidelink configuration parameter acquired from the second relay terminal, and the second sidelink configuration parameter is a configuration parameter applied to a sidelink between the remote terminal and the second relay terminal;

a disconnection module, configured to disconnect a sidelink with the first relay terminal in response to the second relay terminal satisfying a second measurement event;

and the establishing module is used for establishing and configuring the sidelink with the second relay terminal based on the second sidelink configuration parameter.

In another aspect, an embodiment of the present application provides a device for switching a sidelink, where the device is used for a second relay terminal, and the device includes:

a determining module, configured to determine a second sidelink configuration parameter, where the second sidelink configuration parameter is a configuration parameter applied to a sidelink between a remote terminal and the second relay terminal;

a sending module, configured to send the second sidelink configuration parameter to a first relay terminal, where the first relay terminal and a remote terminal establish a sidelink;

and the establishing module is used for establishing and configuring a sidelink with the remote terminal under the condition that the sidelink between the remote terminal and the first relay terminal is disconnected.

In another aspect, an embodiment of the present application provides a terminal, where the terminal includes a processor and a memory; the memory stores at least one instruction for execution by the processor to implement the sidelink handoff method as described in the above aspect.

In another aspect, an embodiment of the present application provides a computer-readable storage medium, where the storage medium stores at least one instruction for execution by a processor to implement the method for sidelink handover as described in the above aspect.

In another aspect, a computer program product is also provided, which includes at least one instruction loaded and executed by a processor to implement the method for sidelink handover as described in the above aspect.

In the embodiment of the present application, in the presence of a second relay terminal that meets a first measurement event, after a remote terminal reports a first measurement report to a first relay terminal, the first relay terminal obtains, from the second relay terminal, a second sidelink configuration parameter that needs to be applied when the remote terminal establishes a sidelink with the second relay terminal, and sends a sidelink reconfiguration message containing the second sidelink configuration parameter to the remote terminal, because the remote terminal obtains, in advance, the configuration parameter that is applied when the sidelink is established with the second relay terminal, subsequently, when it is detected that a second measurement event is met, the remote terminal can quickly establish a sidelink with the second relay terminal based on the second sidelink configuration parameter and further quickly resume data transmission when the sidelink with the first relay terminal is disconnected, and in a scenario that the remote terminal moves, the speed of the remote terminal for rebuilding the sidelink and recovering the data transmission is improved, and the influence of the movement of the remote terminal on the data transmission is reduced.

Drawings

Fig. 1 illustrates a block diagram of a communication system provided by an exemplary embodiment of the present application;

fig. 2 is a flowchart illustrating a handover method of a sidelink according to an exemplary embodiment of the present application;

fig. 3 is a schematic diagram illustrating an implementation of a sidelink handover procedure according to an exemplary embodiment of the present application;

FIG. 4 illustrates a flow chart of a first measurement event configuration process provided by an exemplary embodiment of the present application;

fig. 5 is a flowchart illustrating a sidelink handover configuration acquisition process provided by an exemplary embodiment of the present application;

fig. 6 is a schematic implementation diagram of a sidelink handover configuration acquisition procedure shown in an exemplary embodiment of the present application;

FIG. 7 is a schematic diagram illustrating an implementation of a data transmission recovery process according to an exemplary embodiment of the present application;

fig. 8 is a block diagram illustrating a structure of a sidelink handover apparatus according to an embodiment of the present application;

fig. 9 is a block diagram illustrating a structure of a sidelink switching device according to an embodiment of the present application;

fig. 10 is a block diagram illustrating a structure of a sidelink switching device according to an embodiment of the present application;

fig. 11 is a block diagram illustrating a structure of a terminal according to an exemplary embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Fig. 1 shows a block diagram of a communication system provided by an exemplary embodiment of the present application, which may include: network device 110, relay terminal 120, and remote terminal 130.

Network device 110 may be a base station, which is a device deployed in an access network to provide wireless communication functionality for terminals. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different radio access technologies, the names of devices with base station functions may be different, for example, in LTE systems, referred to as evolved Node bs (enodebs) or enbs; in a 5G New Radio (NR) system, it is called a gbnodeb or a gNB. The description of "base station" may change as communication technology evolves. In this embodiment, the apparatus for providing a wireless communication function for a terminal is collectively referred to as a network device.

The remote terminal 130 may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem with wireless communication capabilities, as well as various forms of user equipment, Mobile Stations (MSs), terminals (terminal devices), and so forth.

The relay terminal 120 is a device that establishes a connection with the network device 110 and a connection with the remote terminal 130. Among them, the remote terminal 130 and the relay terminal 120 may communicate with each other through a direct communication interface (such as a PC5 interface), and accordingly, the communication link established based on the direct communication interface may be referred to as a sidelink. In a possible scenario, the relay terminal 120 and the network device 110 establish a connection through a Uu interface, and a sidelink is established between the relay terminal 120 and the remote terminal 130. The sidelink transmission is that the communication data transmission is directly carried out between the remote terminal and the relay terminal through the sidelink, different from the traditional cellular system that the communication data is received or sent through the access network equipment, the sidelink transmission has the characteristics of short time delay, low cost and the like, and is suitable for the communication between two terminal equipments with close geographic positions (such as vehicle-mounted equipment and other peripheral equipment with close geographic positions); moreover, the remote terminal 130 does not need to establish a connection with the network device 110 directly, or even does not need to be in the coverage area of the network device 110, and can communicate with the network side only by maintaining the sidelink between the relay terminals 120, so that the coverage area of the network device 110 is enlarged, and the spectrum resources consumed by the network device are reduced to a certain extent.

In some embodiments, the relay terminal 120 does not move or moves to a small extent after setup, while the remote terminal 130 supports free movement. For example, the relay terminal 120 is a relay device fixedly installed in a parking lot, and the remote terminal 130 is a vehicle-mounted terminal; the relay device 120 is a VR (Virtual Reality)/AR (Augmented Reality) host, and the remote terminal 130 is a VR/AR headset. Of course, in addition to the above scenarios, the embodiment of the present application may also be used in other relay communication scenarios, and the present application does not limit this scenario.

In one possible scenario, as shown in fig. 1, the network device 110 establishes connections with the first relay terminal 121 and the second relay terminal 122 at the same time, and the remote terminal 130 first establishes a sidelink with the first relay terminal 121, so as to perform data communication with the network device 110 via the first relay terminal 121. When the remote terminal 130 moves, leaves the range of the first relay terminal 121, and enters the range of the second relay terminal 122, the remote terminal 130 disconnects the sidelink with the first relay terminal 121, establishes the sidelink with the second relay terminal 122, and resumes data transmission. The scheme provided by the embodiment of the application relates to improvement of a sidelink switching process.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Global System for Mobile communication (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD) System, an Advanced Long Term Evolution (LTE-A) System, a New wireless (New Radio, NR) System, an Evolution System of an NR System, an LTE-based Access (LTE-to-non-licensed) System, a UMTS-based Access (UMTS-to-non-licensed) System, a UMTS-based Universal Mobile communication (UMTS-to-Universal Mobile Access, UMTS) System, WiMAX) communication system, Wireless Local Area Network (WLAN), Wireless Fidelity (WiFi), next generation communication system, or other communication system.

In the related art, when a sidelink between a remote terminal and a relay terminal is disconnected due to movement of the remote terminal, the remote terminal needs to search for a new relay terminal again, establish a sidelink with the searched new relay terminal, and then resume data communication. In this process, the remote terminal needs to create a new radio resource bearer of the sidelink and needs to interact with a new relay terminal for multiple times, which results in a long time for recovering data communication. In the embodiment of the application, a first measurement event and a second measurement event are newly added, a remote terminal performs measurement, when the first measurement event is detected to be satisfied, a second relay terminal satisfying the second measurement event is determined around the first relay terminal performing sidelink communication at present, and configuration parameters of a sidelink are obtained from the second relay terminal, so that the configuration parameters are transmitted to the remote terminal in advance. When the remote terminal detects that the second measurement event is met, the remote terminal can quickly establish a sidelink with the second relay terminal based on the configuration parameters after disconnecting the sidelink with the first relay terminal, so as to quickly recover data transmission, without newly establishing a radio resource bearer of the sidelink, reduce interaction with the second relay terminal, and improve the recovery speed of data communication.

Referring to fig. 2, a flowchart of a handover method of a sidelink according to an exemplary embodiment of the present application is shown. The present embodiment is described by taking the method as an example for being used in the communication system shown in fig. 1, and the process includes the following steps:

step 201, in response to the existence of the second relay terminal satisfying the first measurement event, the remote terminal reports the first measurement report to the first relay terminal.

In a possible implementation manner, in a case that a sidelink is established between a remote terminal and a first relay terminal, the remote terminal performs signal measurement on a frequency point corresponding to the first relay terminal and at least one other frequency point, and determines whether a second relay terminal meeting a first measurement event exists based on a signal measurement result. If the first measurement report exists, reporting the first measurement report to the first relay terminal; if not, continuing the detection.

In some embodiments, the first measurement event indicates that there are other frequency points whose signal quality is higher than that of the frequency point corresponding to the first relay terminal by a certain offset. In one possible case, when the remote terminal moves (when the first relay terminal moves to another relay terminal), the signal quality of the frequency point corresponding to the first relay terminal is deteriorated, and the signal quality of the other frequency points is improved.

Optionally, the first measurement report includes frequency point information corresponding to the second relay terminal.

Optionally, the measurement configuration corresponding to the first measurement event is configured by the first relay terminal to the remote terminal.

Illustratively, as shown in fig. 3, when establishing a sidelink with the first relay terminal 121, the remote terminal 130 performs signal measurement on frequency points corresponding to the first relay terminal 121 and the second relay terminal 122. When the frequency point corresponding to the second relay terminal 122 meets the first measurement event, the remote terminal 130 reports a first measurement report to the first relay terminal 121.

Step 202, in response to receiving the first measurement report reported by the remote terminal, the first relay terminal determines the second relay terminal.

In a possible implementation manner, after receiving the first measurement report, the first relay terminal determines, based on frequency point information in the first measurement report, second relay terminals that satisfy the first measurement event, where the number of the second relay terminals is at least one.

In order to disconnect the sidelink between the remote terminal and the first relay terminal and establish the sidelink with the second relay terminal, the radio bearer of the sidelink can be quickly recovered, and further the data transmission can be quickly recovered, the first relay terminal needs to interact with the second relay terminal, and the second sidelink configuration parameters applied by the sidelink between the remote terminal and the second relay terminal are obtained.

In some embodiments, the first relay terminal establishes a sidelink with the second relay terminal, so as to interact with the second relay terminal through the sidelink, and instruct the second relay terminal to determine the second sidelink configuration parameter.

In step 203, the second relay terminal determines a second sidelink configuration parameter, where the second sidelink configuration parameter is a configuration parameter applied to a sidelink between the remote terminal and the second relay terminal.

In a possible embodiment, after receiving the request sent by the first relay terminal through the sidelink, the second relay terminal determines the second sidelink configuration parameter based on the request. Optionally, the second sidelink configuration parameter is used to configure a Radio Bearer of the sidelink, for example, a Signaling Radio Bearer (SRB), a Data Radio Bearer (DRB) resource, and the like.

And step 204, the second relay terminal sends the second sidelink configuration parameter to the first relay terminal.

Optionally, the second relay terminal sends the second sidelink configuration parameter to the first relay terminal through the sidelink.

In step 205, the first relay terminal obtains the second sidelink configuration parameter from the second relay terminal.

Optionally, the first relay terminal receives a second sidelink configuration parameter sent by the second relay terminal through the sidelink.

Illustratively, as shown in fig. 3, after the first relay terminal 121 receives the first measurement report, the second relay terminal 122 obtains the second sidelink configuration parameter.

In step 206, the first relay terminal sends a sidelink reconfiguration message containing the second sidelink configuration parameter to the remote terminal.

Further, the first relay terminal generates a sidelink reconfiguration message based on the second sidelink configuration parameter, and sends the sidelink reconfiguration message to the remote terminal through a sidelink with the remote terminal. Optionally, the sidelink reconfiguration message further includes, in addition to the second sidelink configuration parameter, a measurement configuration of the second measurement event, so that the remote terminal continues to measure the second measurement event.

Illustratively, as shown in fig. 3, the first relay terminal 121 transmits a sidelink reconfiguration message to the remote terminal 130.

In step 207, the remote terminal receives the sidelink reconfiguration message sent by the first relay terminal.

Optionally, after receiving the sidelink reconfiguration message, the remote terminal stores the second sidelink configuration parameter, and continues to perform signal measurement on the frequency points corresponding to the first relay terminal and the second relay terminal. When at least two second relay terminals exist, the remote terminal performs associated storage on the frequency point information and the second sidelink configuration parameters corresponding to each second relay terminal.

In step 208, in response to the second relay terminal satisfying the second measurement event, the remote terminal disconnects the sidelink with the first relay terminal.

When the signal quality of the second relay terminal meets the second measurement event, the remote terminal determines that the quality of the service provided by the first relay terminal cannot meet the requirement, so that the sidelink between the remote terminal and the first relay terminal is disconnected.

In some embodiments, the second measurement event indicates that there is a frequency point corresponding to another relay terminal whose signal quality is higher than the first threshold, and the frequency point corresponding to the first relay terminal whose signal quality is lower than the second threshold.

In step 209, the remote terminal establishes and configures a sidelink with the second relay terminal based on the second sidelink configuration parameter.

Since the signal quality of the second relay terminal is better, the remote terminal establishes the sidelink with the second relay terminal, and since the remote terminal stores the second sidelink configuration parameter in advance, the remote terminal can use the configuration parameter to configure the radio bearer of the sidelink (without a radio bearer establishment process), and then recover the data transmission of the sidelink.

Illustratively, as shown in fig. 3, after the remote terminal 130 leaves the coverage of the first relay terminal 121 due to movement and enters the coverage of the second relay terminal 122, the remote terminal 130 determines that the second measurement event is satisfied through signal measurement, thereby disconnecting the sidelink with the first relay terminal 121, establishing and configuring the sidelink with the second relay terminal 122, and resuming data transmission.

Step 210, in case that the sidelink between the remote terminal and the first relay terminal is disconnected, the second relay terminal and the remote terminal establish and configure the sidelink.

Correspondingly, the second relay terminal establishes and configures a sidelink with the remote terminal, thereby serving as an intermediary between the remote terminal and the network device 110 to implement data transmission.

To sum up, in this embodiment of the present application, after the remote terminal reports the first measurement report to the first relay terminal in the presence of the second relay terminal that satisfies the first measurement event, the first relay terminal obtains, from the second relay terminal, the second sidelink configuration parameter that needs to be applied when the remote terminal establishes the sidelink with the second relay terminal, and sends the sidelink reconfiguration message containing the second sidelink configuration parameter to the remote terminal, because the remote terminal obtains the configuration parameter applied when establishing the sidelink with the second relay terminal in advance, the remote terminal can quickly establish the sidelink with the second relay terminal based on the second sidelink configuration parameter when detecting that satisfies the second measurement event, and then quickly resume data transmission when disconnecting the sidelink with the first relay terminal, under the scene that the remote terminal moves, the speed of the remote terminal for rebuilding the side link and recovering data transmission is improved, and the influence of the movement of the remote terminal on the data transmission is reduced.

With regard to the first measurement event and the second measurement event in the foregoing embodiments, in one possible implementation manner, the first measurement configuration information corresponding to the first measurement event includes an exclusive offset (Ofn) of the candidate frequency point, an exclusive offset (Ofp) of the frequency point corresponding to the first relay terminal, a hysteresis parameter (Hys) of the first measurement event, and an offset parameter (Off) of the first measurement event, and when Mn + Ofn-Hys > Mp + Ofp + Off (entry condition of the first measurement event), the remote terminal determines that the candidate frequency point satisfies the first measurement event, where Mn is a measurement result of the candidate frequency point and Mp is a measurement result of the frequency point corresponding to the first relay terminal.

Wherein, for Mn and Mp, if the measurement result is Reference Signal Receiving Power (RSRP), the unit is dBm; if the measurement result is the Reference Signal Receiving Quality (RSRQ) or the Reference Signal to Noise Ratio (RS-SINR), the unit is dB. For Ofn, Ofp, Hys, and Off, the units are dB.

Correspondingly, when Mn + Ofn + Hys < Mp + Ofp + Off (exit condition of the first measurement event), the remote terminal determines that the candidate frequency point does not satisfy the first measurement event.

In some embodiments, the first measurement configuration information further includes a first timer duration. When the entry condition of the first measurement event is met, the remote terminal starts a timer (the duration is the duration of the first timer). If the timer is overtime, determining that a first measurement event is met; the remote terminal starts a timer when an exit condition of the first measurement event is satisfied. If the timer times out, it is determined that the first measurement event is not satisfied.

In a possible implementation manner, the second measurement configuration information corresponding to the second measurement event includes an exclusive offset (Ofn) of the target frequency point, a hysteresis parameter (Hys) of the second measurement event, a first threshold (Thresh1), and a second threshold (Thresh 2). When Mp + Hys < Thresh1 and Mn + Ofn-Hys > Thresh2 (entry condition of the second measurement event), the target frequency point satisfies the second measurement event, Mn is the measurement result of the target frequency point, and Mp is the measurement result of the frequency point corresponding to the first relay terminal.

Wherein, for Mn, Mp, Thresh1 and Thresh2, if the measurement result is RSRP, the unit is dBm; if the measurement result is RSRQ or RS-SINR, the unit is dB. For Ofn and Hys, the units are dB.

Correspondingly, when Mp-Hys > Thresh1 or Mn + Ofn + Hys < Thresh2 (exit condition of the second measurement event), the remote terminal determines that the target frequency point does not satisfy the second measurement event.

In some embodiments, the second measurement configuration information further includes a second timer duration. When the entry condition of the second measurement event is satisfied, the remote terminal starts a timer (the duration is the duration of the second timer). If the timer is overtime, determining that a second measurement event is met; the remote terminal starts a timer when the exit condition of the second measurement event is satisfied. If the timer times out, it is determined that the second measurement event is not satisfied.

In a possible implementation manner, the first relay terminal may obtain frequency point information of other relay terminals nearby in advance, and configure a measurement object of the first measurement event for the remote terminal based on the frequency point information after establishing a sidelink with the remote terminal. The following description will be made using exemplary embodiments.

Referring to fig. 4, a flowchart of a first measurement event configuration process provided by an exemplary embodiment of the present application is shown. The present embodiment is described by taking the method as an example for being used in the communication system shown in fig. 1, and the process includes the following steps:

in step 401, a first relay terminal detects candidate relay terminals in the surrounding environment.

In one possible embodiment, when the detection condition is satisfied, the first relay terminal detects other candidate relay terminals existing in the surrounding environment. And acquiring the frequency point information corresponding to other candidate relay terminals in the detection process of the first relay terminal.

Optionally, the detection condition may include at least one of:

1. when the first relay terminal is started up;

2. when a periodic timer set in the first relay terminal times out;

3. when the first relay terminal establishes a sidelink with the new remote terminal.

Step 402, in response to detecting the candidate relay terminal and successfully establishing a sidelink with the candidate relay terminal, the first relay terminal acquires frequency point information of the candidate relay terminal.

For the detected candidate relay terminal, the first relay terminal tries to establish a sidelink with the candidate relay terminal, and if the sidelink is successfully established, the first relay terminal acquires frequency point information of the candidate relay terminal, wherein the frequency point information can be acquired from the candidate relay terminal through the established sidelink.

Optionally, after the frequency point information is acquired, the first relay terminal disconnects the sidelink with the candidate relay terminal.

In step 403, the first relay terminal establishes a corresponding relationship between the candidate frequency point and the candidate relay terminal based on the frequency point information.

For the candidate relay terminals which acquire the frequency point information, the first relay terminal performs associated storage on the candidate relay terminals and the candidate frequency points based on the frequency point information to obtain a corresponding relation between the candidate frequency points and the candidate relay terminals, so that a first measurement event is configured based on the corresponding relation in the following process, and the candidate relay terminals which meet the first measurement event are identified.

In an illustrative example, the correspondence between the candidate frequency point and the candidate relay terminal is shown in table one.

Watch 1

Candidate frequency point	Candidate relay terminal
		Frequency point 1	Relay terminal A
Frequency point
	2	Relay terminal B
Frequency point 3			Relay terminal C

Step 404, the first relay terminal sends a measurement configuration message to the remote terminal, where the measurement configuration message includes first measurement configuration information of the first measurement event and the candidate frequency point.

After a sidelink is established with a remote terminal, the first relay terminal sends a measurement configuration message aiming at each candidate relay terminal to the remote terminal through the sidelink, wherein the measurement configuration message comprises frequency point information of candidate frequency points and first measurement configuration information. The content included in the first measurement configuration information may refer to the foregoing embodiments, which are not described herein again.

In step 405, the remote terminal receives a measurement configuration message sent by the first relay terminal.

Correspondingly, the remote terminal receives the measurement configuration message sent by the first relay terminal through the sidelink.

And 406, the remote terminal measures the candidate frequency point based on the first measurement configuration information.

In some embodiments, the remote terminal determines the measurement object based on the candidate frequency point contained in the measurement configuration message, and determines whether the candidate frequency point satisfies the first measurement event based on the measurement result and the first measurement configuration information. If yes, the remote terminal reports a first measurement report containing the candidate frequency point to the first relay terminal, and then executes the subsequent switching process of the sidelink.

In a possible implementation manner, in response to receiving the first measurement report reported by the remote terminal, the first relay terminal obtains a target frequency point (i.e., a frequency point satisfying a first measurement event) included in the first measurement report, and then determines, based on a correspondence between the candidate frequency point and the candidate relay terminal, a second relay terminal corresponding to the target frequency point.

And as shown in the first table, the remote terminal performs signal measurement on the frequency point 1, the frequency point 2 and the frequency point 3 respectively, and reports a first measurement report containing the frequency point 2 based on a signal measurement result. And the first relay terminal determines that the relay terminal B meets the first measurement event based on the frequency point 2.

In the above embodiment, taking the first relay terminal actively detecting the surrounding candidate relay terminals (that is, the correspondence between the candidate frequency point and the candidate relay terminal is detected by the first relay terminal) as an example, in another possible implementation, if the relay terminal is fixedly set, or only can move within a small range, because the networking mode does not change frequently, the correspondence between the candidate frequency point and the candidate relay terminal may also be set in the configuration information of the first relay terminal, for example, the correspondence is set when the first relay terminal leaves a factory, so that the first relay terminal does not need to actively detect other relay terminals.

Of course, in other possible implementations, the preset and the active detection may be combined, and this embodiment does not limit this.

Under the condition that a sidelink is established between a first relay terminal and a remote terminal, the first relay terminal knows a first sidelink configuration parameter of a current sidelink, in order to improve the configuration efficiency of the sidelink between a subsequent remote terminal and a second relay terminal, the first relay terminal can provide the first sidelink configuration parameter for the second relay terminal, the second relay terminal determines a second sidelink configuration parameter suitable for the first relay terminal based on the first sidelink configuration parameter, and feeds the second sidelink configuration parameter back to the first relay terminal, and the first relay terminal issues the second relay terminal in advance. The following description will be made using exemplary embodiments.

Referring to fig. 5, a flowchart of a sidelink handover configuration acquisition process provided in an exemplary embodiment of the present application is shown. The present embodiment is described by taking the method as an example for being used in the communication system shown in fig. 1, and the process includes the following steps:

step 501, in response to the existence of a second relay terminal satisfying the first measurement event, the remote terminal reports a first measurement report to the first relay terminal.

Step 502, in response to receiving a first measurement report reported by a remote terminal, a first relay terminal determines a second relay terminal.

The implementation of steps 501 to 502 may refer to the above embodiments, which are not described herein.

In step 503, the first relay terminal sends a sidelink handover preparation message to the second relay terminal via the sidelink with the second relay terminal.

In a possible implementation manner, after the second relay terminal is determined, the first relay terminal first establishes a first sidelink with the second relay terminal, and sends a preparation request containing sidelink handover to the second relay terminal through the sidelink. The sidelink handover preparation message includes a first sidelink configuration parameter of a sidelink between the first relay terminal and the remote terminal. In some embodiments, the first sidelink configuration parameter is used for configuring a radio bearer of a sidelink between the first relay terminal and the remote terminal.

Illustratively, as shown in fig. 6, after receiving the first measurement report sent by the remote terminal 130, the first relay terminal 121 sends a handover preparation information sidelink message to the second relay terminal 122, where the message includes the first sidelink configuration parameter (rrcReconfiguration).

Optionally, the sidelink handover preparation message may further include a sending end identifier and a receiving end identifier, in addition to the first sidelink configuration parameter, where the sending end identifier is used to characterize a sending end in the sidelink (between the first relay terminal and the remote terminal), and the receiving end identifier is used to characterize a receiving end in the sidelink.

Illustratively, the sending end identifier is Source Layer-2 ID, the receiving end identifier is Destination Layer-2 ID, and both are unique identifiers with 24 bits.

In step 504, the second relay terminal receives the sidelink handover preparation message sent by the first relay terminal through the sidelink with the first relay terminal.

Correspondingly, the first relay terminal receives the sidelink handover preparation message through the sidelink, and acquires the first sidelink configuration parameters contained therein.

In step 505, the second relay terminal determines a second sidelink configuration parameter based on the first sidelink configuration parameter.

Because the spare resources owned by different relay terminals are different, after the second relay terminal acquires the first sidelink configuration parameter, the second relay terminal needs to determine the second sidelink configuration parameter based on the current spare resource. In one possible implementation, the second relay terminal determines the second sidelink configuration parameter based on the first sidelink configuration parameter and its current vacant DRB resource.

In an illustrative example, the second relay terminal generates Ho-RRCReconfigurationSidelink (second sidelink configuration parameter) based on rrcrreconfiguration based on the current free resources.

It should be noted that, when the sidelink handover preparation message includes the sender identifier and the receiver identifier, the second relay terminal stores the sender identifier and the receiver identifier, so as to make sure the sender and the receiver in the link after establishing the sidelink with the remote terminal.

In step 506, the second relay terminal sends a sidelink handover confirmation message to the first relay terminal through the sidelink with the first relay terminal.

Further, the second relay terminal generates a sidelink handover confirmation message based on the determined second sidelink configuration parameter, and sends the sidelink handover confirmation message to the first relay terminal through the sidelink.

Illustratively, as shown in fig. 6, the second relay terminal 122 sends a handover command sidelink message including the Ho-rrcreconconfigurationsidelink to the first relay terminal 121.

In step 507, the first relay terminal receives a sidelink handover confirmation message sent by the second relay terminal through the sidelink with the second relay terminal.

Correspondingly, the first relay terminal receives the sidelink handover confirmation message through the sidelink. Optionally, after receiving the sidelink handover confirmation message, the sidelink between the first relay terminal and the second relay terminal is disconnected.

In step 508, the first relay terminal sends a sidelink reconfiguration message containing the second sidelink configuration parameter and the second measurement configuration information to the remote terminal.

After receiving the sidelink handover confirmation message, the second relay terminal is indicated to be capable of meeting the data transmission requirement of the remote terminal, so that a sidelink reconfiguration message is generated based on a second sidelink configuration parameter in the message and second measurement configuration information of a second measurement event, and the sidelink reconfiguration message is sent to the remote terminal in advance before the remote terminal leaves the coverage range of the first relay terminal.

Illustratively, as shown in fig. 6, after receiving the handover command sildenk message, the first relay terminal 121 sends an rrcreeconfiguration sildenk message including Ho-rrcreeconfiguration sildenk and sl-measconfiguration-r 16 (second measurement configuration information) to the remote terminal 130.

So far, the second relay terminal knows in advance the remote terminal which needs to switch the sidelink subsequently, and the remote terminal knows in advance the sidelink configuration parameter used when establishing the sidelink with the second relay terminal. And when the signal quality of the first relay terminal and the second relay terminal meets the second measurement event, the remote terminal establishes a sidelink with the second relay terminal and configures the radio bearer based on the sidelink configuration parameters acquired in advance, so as to recover data transmission.

In a possible implementation manner, after the sidelink reconfiguration is completed, the remote terminal sends a sidelink reconfiguration complete message to the second relay terminal, and after the second relay terminal receives the sidelink reconfiguration complete message sent by the remote terminal, the data transmission of the sidelink is recovered based on the sending terminal identifier and the receiving terminal identifier.

Optionally, the second relay terminal detects whether the second relay terminal belongs to the sending terminal identifier or the receiving terminal identifier based on the terminal identifier of the remote terminal, and if the second relay terminal belongs to the sending terminal identifier or the receiving terminal identifier, determines the sending terminal and the receiving terminal of the sidelink with the remote terminal, so as to resume data transmission.

Illustratively, as shown in fig. 7, the Source Layer-2 ID and Destination Layer-2 ID are included in the handover preparation information sidelink message sent by the first relay terminal 121 to the second relay terminal 122, and are stored by the second relay terminal 122. After receiving the rrcreconfiguration complete sidelink message sent by the remote terminal 130, it is determined that the terminal ID of the remote terminal 130 is consistent with the Destination Layer-2 ID, thereby resuming the data transmission to the remote terminal 130 through the sidelink.

Referring to fig. 8, a block diagram of a sidelink handover apparatus according to an embodiment of the present application is shown. This means may be implemented by software, hardware or a combination of both as all or part of the first relay terminal 121 in fig. 1. The device includes:

a determining module 801, configured to determine, in response to receiving a first measurement report reported by a remote terminal, a second relay terminal, where the second relay terminal is a relay terminal that satisfies a first measurement event corresponding to the first measurement report;

an obtaining module 802, configured to obtain a second sidelink configuration parameter from the second relay terminal, where the second sidelink configuration parameter is a configuration parameter applied to a sidelink between the remote terminal and the second relay terminal;

a sending module 803, configured to send a sidelink reconfiguration message including the second sidelink configuration parameter to the remote terminal, so that the remote terminal disconnects a sidelink with the first relay terminal when the second relay terminal meets a second measurement event, and establishes and configures a sidelink with the second relay terminal based on the second sidelink configuration parameter.

Optionally, the determining module 801 includes:

an obtaining unit, configured to obtain a target frequency point included in the first measurement report in response to receiving the first measurement report reported by the remote terminal, where the target frequency point is a frequency point that meets the first measurement event;

and the determining unit is used for determining the second relay terminal corresponding to the target frequency point based on the corresponding relation between the candidate frequency point and the candidate relay terminal.

Optionally, the correspondence between the candidate frequency point and the candidate relay terminal is obtained by the detection of the first relay terminal, or is set in the configuration information of the first relay terminal.

Optionally, the correspondence between the candidate frequency point and the candidate relay terminal is obtained by the detection of the first relay terminal;

the device further comprises:

a relationship establishing module for detecting the candidate relay terminals in the surrounding environment;

responding to the detection of the candidate relay terminal and successfully establishing a sidelink with the candidate relay terminal, and acquiring the frequency point information of the candidate relay terminal;

and establishing a corresponding relation between the candidate frequency point and the candidate relay terminal based on the frequency point information.

Optionally, the apparatus further comprises:

the sending module 803 is further configured to send a measurement configuration message to the remote terminal, where the measurement configuration message includes the first measurement configuration information of the first measurement event and the candidate frequency point, and the remote terminal is configured to measure the candidate frequency point based on the first measurement configuration information.

Optionally, the first measurement configuration information includes an exclusive offset Ofn of the candidate frequency point, an exclusive offset Ofp of a frequency point corresponding to the first relay terminal, a hysteresis parameter Hys of the first measurement event, and an offset parameter Off of the first measurement event;

when Mn + Ofn-Hys > Mp + Ofp + Off, the candidate frequency point satisfies the first measurement event, Mn is the measurement result of the candidate frequency point, and Mp is the measurement result of the frequency point corresponding to the first relay terminal.

Optionally, the obtaining module 802 is configured to:

sending a sidelink handover preparation message to the second relay terminal through a sidelink with the second relay terminal, wherein the sidelink handover preparation message includes a first sidelink configuration parameter of the sidelink between the first relay terminal and the remote terminal;

and receiving a sidelink switching confirmation message sent by the second relay terminal through a sidelink between the first relay terminal and the second relay terminal, wherein the sidelink switching confirmation message comprises the second sidelink configuration parameter, and the second sidelink configuration parameter is determined and obtained based on the first sidelink configuration parameter.

Optionally, the sidelink handover preparation message further includes a sending end identifier and a receiving end identifier, where the sending end identifier is used to characterize a sending end in the sidelink, the receiving end identifier is used to characterize a receiving end in the sidelink, and the second relay terminal is used to store the sending end identifier and the receiving end identifier, so as to recover data transmission of the sidelink based on the sending end identifier and the receiving end identifier.

Optionally, the sidelink reconfiguration message includes second measurement configuration information of the second measurement event, where the second measurement configuration information includes the dedicated offset Ofn of the target frequency point, the hysteresis parameter Hys of the second measurement event, a first threshold Thresh1, and a second threshold Thresh 2;

when Mp + Hys < Thresh1 and Mn + Ofn-Hys > Thresh2 are used, the target frequency point satisfies the second measurement event, Mn is a measurement result of the target frequency point, and Mp is a measurement result of a frequency point corresponding to the first relay terminal.

Referring to fig. 9, a block diagram of a sidelink handover apparatus according to an embodiment of the present application is shown. The apparatus may be implemented as all or a portion of remote terminal 130 of fig. 1 via software, hardware, or a combination of both. The device includes:

a reporting module 901, configured to report a first measurement report to a first relay terminal in response to a second relay terminal that meets a first measurement event, where a sidelink is established between the remote terminal and the first relay terminal;

a receiving module 902, configured to receive a sidelink reconfiguration message sent by the first relay terminal, where the sidelink reconfiguration message includes a second sidelink configuration parameter acquired from the second relay terminal, and the second sidelink configuration parameter is a configuration parameter applied to a sidelink between the remote terminal and the second relay terminal;

a disconnecting module 903, configured to disconnect a sidelink with the first relay terminal in response to the second relay terminal satisfying a second measurement event;

an establishing module 904, configured to establish and configure a sidelink with the second relay terminal based on the second sidelink configuration parameter.

Optionally, the receiving module 902 is further configured to receive a measurement configuration message sent by the first relay terminal, where the measurement configuration message includes first measurement configuration information of the first measurement event and a candidate frequency point, and the candidate frequency point is a frequency point corresponding to the candidate relay terminal;

and the measurement module is used for measuring the candidate frequency point based on the first measurement configuration information.

Optionally, the sidelink reconfiguration message includes second measurement configuration information of the second measurement event, where the second measurement configuration information includes an exclusive offset Ofn of a target frequency point, a hysteresis parameter Hys of the second measurement event, a first threshold Thresh1, and a second threshold Thresh2, and the target frequency point is a frequency point corresponding to the second relay terminal;

when Mp + Hys < Thresh1 and Mn + Ofn-Hys > Thresh2 are present, the target frequency point satisfies the second measurement event, Mn is a measurement result of the target frequency point, and Mp is a measurement result of a frequency point corresponding to the first relay terminal.

Optionally, the apparatus further comprises:

a sending module, configured to send a sidelink reconfiguration complete message to the second relay terminal, so that the second relay terminal identifies the remote terminal based on a sending end identifier and a receiving end identifier, and recovers data transmission of a sidelink, where the sending end identifier is used to characterize a sending end in the sidelink, and the receiving end identifier is used to characterize a receiving end in the sidelink.

Referring to fig. 10, a block diagram of a sidelink handover apparatus according to an embodiment of the present application is shown. The apparatus may be implemented by software, hardware, or a combination of both as all or a portion of the second relay terminal 122 in fig. 1. The device includes:

a determining module 1001, configured to determine a second sidelink configuration parameter, where the second sidelink configuration parameter is a configuration parameter applied to a sidelink between a remote terminal and the second relay terminal;

a sending module 1002, configured to send the second sidelink configuration parameter to a first relay terminal, where a sidelink is established between the first relay terminal and a remote terminal;

an establishing module 1003, configured to establish and configure a sidelink with the remote terminal when the sidelink between the remote terminal and the first relay terminal is disconnected.

Optionally, the determining module 1001 is configured to:

receiving a sidelink handover preparation message sent by the first relay terminal through a sidelink between the first relay terminal and the first relay terminal, wherein the sidelink handover preparation message contains a first sidelink configuration parameter of the sidelink between the first relay terminal and the remote terminal;

determining the second sidelink configuration parameter based on the first sidelink configuration parameter;

the sending module 1002 is configured to:

and sending a sidelink handover confirmation message to the first relay terminal through a sidelink between the first relay terminal and the sidelink, wherein the sidelink handover confirmation message comprises the second sidelink configuration parameter.

Optionally, the sidelink handover preparation message further includes a sending end identifier and a receiving end identifier, where the sending end identifier is used to characterize a sending end in the sidelink, and the receiving end identifier is used to characterize a receiving end in the sidelink;

the sending module 1002 is further configured to:

and recovering the data transmission of the sidelink based on the sending end identification and the receiving end identification in response to receiving the sidelink reconfiguration finishing message sent by the remote terminal.

Referring to fig. 11, a block diagram of a terminal according to an exemplary embodiment of the present application is shown. The terminal may implement what is referred to as a relay terminal or a remote terminal in fig. 1. A terminal in the present application may include one or more of the following components: a processor 1101, a memory 1102, a receiver 1103, and a transmitter 1104.

Processor 1101 may include one or more processing cores. The processor 1101 connects various parts within the overall terminal using various interfaces and lines, and performs various functions of the terminal and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 1102 and calling data stored in the memory 1102. Alternatively, the processor 1101 may be implemented in hardware using at least one of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The processor 1101 may integrate one or more of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a Neural-Network Processing Unit (NPU), a modem, and the like. Wherein, the CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing contents required to be displayed by the touch display screen; the NPU is used for realizing an Artificial Intelligence (AI) function; the modem is used to handle wireless communications. It is understood that the modem may not be integrated into the processor 1101, but may be implemented by a single chip.

The Memory 1102 may include a Random Access Memory (RAM) or a Read-Only Memory (ROM). Optionally, the memory 1102 includes a non-transitory computer-readable medium. The memory 1102 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 1102 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing various method embodiments described below, and the like; the storage data area may store data (such as audio data, a phonebook) created according to the use of the terminal 13, and the like.

The receiver 1103 and the transmitter 1104 may be implemented as one communication component, which may be a communication chip.

In addition, those skilled in the art will appreciate that the configurations of the terminals illustrated in the above-described figures do not constitute limitations on the terminals, as the terminals may include more or less components than those illustrated, or some components may be combined, or a different arrangement of components may be used. For example, the terminal further includes a camera module, an input unit, a sensor (such as an acceleration sensor, an angular velocity sensor, a light sensor, etc.), an audio circuit, a Wireless Fidelity (WiFi) module, a power supply, a bluetooth module, and other components, which are not described herein again.

The embodiment of the present application further provides a computer-readable medium, where at least one instruction is stored, and the at least one instruction is loaded and executed by a processor to implement the sidelink handover method as described in the above embodiments.

The embodiment of the present application further provides a computer program product, where at least one instruction is stored, and the at least one instruction is loaded and executed by a processor to implement the sidelink handover method according to the above embodiments.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for switching a sidelink, wherein the method is used for a first relay terminal, and the method comprises the following steps:

2. The method of claim 1, wherein determining the second relay terminal in response to receiving the first measurement report reported by the remote terminal comprises:

responding to the first measurement report reported by the remote terminal, and acquiring a target frequency point contained in the first measurement report, wherein the target frequency point is a frequency point meeting the first measurement event;

and determining the second relay terminal corresponding to the target frequency point based on the corresponding relation between the candidate frequency point and the candidate relay terminal.

3. The method according to claim 2, wherein the correspondence between the candidate frequency point and the candidate relay terminal is obtained by the first relay terminal through detection, or is set in configuration information of the first relay terminal.

4. The method of claim 3, wherein the correspondence between the candidate frequency point and the candidate relay terminal is detected by the first relay terminal;

the method further comprises the following steps:

detecting the candidate relay terminals in the surrounding environment;

5. The method of claim 2, wherein before determining the second relay terminal in response to receiving the first measurement report reported by the remote terminal, the method further comprises:

and sending a measurement configuration message to the remote terminal, wherein the measurement configuration message comprises first measurement configuration information of the first measurement event and the candidate frequency point, and the remote terminal is used for measuring the candidate frequency point based on the first measurement configuration information.

6. The method according to claim 5, wherein the first measurement configuration information includes an exclusive offset Ofn of the candidate frequency point, an exclusive offset Ofp of a frequency point corresponding to the first relay terminal, a hysteresis parameter Hys of the first measurement event, and an offset parameter Off of the first measurement event;

7. The method according to any of claims 1 to 6, wherein the obtaining the second sidelink configuration parameter from the second relay terminal comprises:

8. The method of claim 7, wherein the sidelink handover preparation message further comprises a sender identifier and a receiver identifier, the sender identifier is used for characterizing a sender in the sidelink, the receiver identifier is used for characterizing a receiver in the sidelink, and the second relay terminal is used for storing the sender identifier and the receiver identifier, so as to recover the data transmission of the sidelink based on the sender identifier and the receiver identifier.

9. The method according to any of claims 1 to 6, wherein said sidelink reconfiguration message includes second measurement configuration information of said second measurement event, said second measurement configuration information includes an exclusive offset Ofn of said target frequency point, a hysteresis parameter Hys of said second measurement event, a first threshold Thresh1 and a second threshold Thresh 2;

10. A method for handover of a sidelink, the method being used for a remote terminal, the method comprising:

11. The method of claim 10, wherein before reporting the first measurement report to the first relay terminal in response to the presence of the second relay terminal satisfying the first measurement event, the method comprises:

receiving a measurement configuration message sent by the first relay terminal, wherein the measurement configuration message comprises first measurement configuration information of the first measurement event and a candidate frequency point, and the candidate frequency point is a frequency point corresponding to the candidate relay terminal;

and measuring the candidate frequency points based on the first measurement configuration information.

12. The method according to claim 11, wherein the first measurement configuration information includes an exclusive offset Ofn of the candidate frequency point, an exclusive offset Ofp of a corresponding frequency point of the first relay terminal, a hysteresis parameter Hys of the first measurement event, and an offset parameter Off of the first measurement event;

13. The method according to any one of claims 10 to 12, wherein the sidelink reconfiguration message includes second measurement configuration information of the second measurement event, the second measurement configuration information includes an exclusive offset Ofn of a target frequency point, a hysteresis parameter Hys of the second measurement event, a first threshold Thresh1, and a second threshold Thresh2, and the target frequency point is a frequency point corresponding to the second relay terminal;

14. The method according to any of claims 10 to 12, wherein after establishing and configuring the sidelink with the second relay terminal based on the second sidelink configuration parameter, the method comprises:

and sending a sidelink reconfiguration completion message to the second relay terminal so that the second relay terminal identifies the remote terminal based on a sending end identifier and a receiving end identifier and recovers data transmission of the sidelink, wherein the sending end identifier is used for representing a sending end in the sidelink, and the receiving end identifier is used for representing a receiving end in the sidelink.

15. A method for switching a sidelink, wherein the method is used for a second relay terminal, and the method comprises the following steps:

16. The method of claim 15, wherein determining the second sidelink configuration parameter comprises:

the sending the second sidelink configuration parameter to the first relay terminal includes:

17. The method of claim 16, wherein the sidelink handover preparation message further comprises a sender identifier and a receiver identifier, wherein the sender identifier is used for characterizing a sender in the sidelink, and the receiver identifier is used for characterizing a receiver in the sidelink;

after establishing and configuring a sidelink with the remote terminal, the method further comprises:

18. An apparatus for switching a sidelink, the apparatus being used for a first relay terminal, the apparatus comprising:

19. A sidelink handover apparatus, for a remote terminal, comprising:

20. A handover apparatus of a sidelink, wherein the apparatus is used for a second relay terminal, the apparatus comprising:

21. A terminal, characterized in that the terminal comprises a processor and a memory; the memory stores at least one instruction for execution by the processor to implement the method for sidelink handover as claimed in any one of claims 1 to 9, or the method for sidelink handover as claimed in any one of claims 10 to 14, or the method for sidelink handover as claimed in any one of claims 15 to 17.

22. A computer-readable storage medium storing at least one instruction for execution by a processor to implement the method for sidelink handover as claimed in any one of claims 1 to 9, or the method for sidelink handover as claimed in any one of claims 10 to 14, or the method for sidelink handover as claimed in any one of claims 15 to 17.

23. A computer program product comprising at least one instruction loaded and executed by a processor to implement the method for sidelink handover as claimed in any one of claims 1 to 9, or the method for sidelink handover as claimed in any one of claims 10 to 14, or the method for sidelink handover as claimed in any one of claims 15 to 17.