CN113596934B

CN113596934B - Reselection method of relay terminal equipment and terminal equipment

Info

Publication number: CN113596934B
Application number: CN202010368309.1A
Authority: CN
Inventors: 郑倩
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2022-10-18
Anticipated expiration: 2040-04-30
Also published as: CN113596934A; WO2021219068A1

Abstract

The application discloses a reselection method of relay terminal equipment and the terminal equipment, and belongs to the technical field of communication. The reselection method of the relay terminal equipment comprises the following steps: under the condition that it is determined that first relay terminal equipment (UE) meets a relay reselection condition, triggering a relay reselection process, wherein the first relay UE is the UE which currently provides relay service for remote UE; wherein determining that the first relay terminal device UE satisfies the relay reselection condition includes at least one of: determining to send a secondary link Radio Resource Control (RRC) reconfiguration failure message; determining that a first relay UE receives a secondary link RRC reconfiguration failure message; receiving a sidelink RRC reconfiguration failure message sent by first relay UE; determining that a sidelink RRC reconfiguration flow fails; determining that the secondary link Signaling Radio Bearer (SRB) integrity protection verification fails. The embodiment of the application can ensure that the remote UE can always perform service transmission on a reliable relay UE.

Description

Reselection method of relay terminal equipment and terminal equipment

Technical Field

The present application relates to the field of communications, and in particular, to a reselection method for a relay terminal device and a terminal device.

Background

Currently, a Long Term Evolution (LTE) system supports Sidelink (SL, which may also be referred to as a side link, a Sidelink, or a side link) transmission. SL is used for data transmission between User equipments (UEs, also called terminal equipments) without passing through a network device, as shown in fig. 1.

In addition, the LTE system also supports a communication mechanism based on a relay (relay) technology, and specifically may be a UE-to-Network relay, that is, one end of a relay terminal device (relay UE) is connected to the UE based on a PC5 interface, and the other end is connected to a Network side based on a Uu interface, where the UE connected to the relay UE may be called a remote terminal device (remote UE), such as a two-hop relay shown in fig. 2, and the relay UE divides a Network device-UE link into two links, namely a Network device-relay UE and a relay UE-remote UE, so that a link with poor quality is replaced by two links with better quality, and higher link capacity and better coverage are obtained. In the LTE system, when a remote UE satisfies a certain condition, relay UE selection or reselection may be performed. Currently, the selection of relay UE is mainly determined based on the link between UE and network side and the signal quality on sidelink; the current reselection is mainly triggered by the upper layer of the remote UE when the remote UE finds that the measurement result of the secondary link Discovery Reference Signal Received Power (SD-RSRP) is smaller than a certain threshold.

For a New Radio (NR) sidelink, the New Radio (NR) sidelink has some characteristics different from that of the LTE sidelink, such as that the NR sidelink supports PC 5-Radio Resource Control (RRC) connection, introduces PC 5-Signaling Radio Bearer (SRB), and the like, which may cause a certain influence on the design of a relay communication mechanism based on the NR sidelink. Therefore, in the process of implementing the present application, the inventors found that at least the following problems exist in the prior art: how to implement the reselection mechanism for relay UEs when considering some new characteristics of the aforementioned NR sidelink.

Disclosure of Invention

An object of the embodiments of the present application is to provide a reselection method for a relay terminal device and a terminal device, so as to solve a problem of how to implement a reselection mechanism for relay UE when some new characteristics of NR sidelink are considered.

In a first aspect, an embodiment of the present application provides a method for reselecting a relay terminal device, where the method is applied to a remote terminal device, and the method includes:

under the condition that it is determined that first relay terminal equipment (UE) meets a relay reselection condition, triggering a relay reselection process, wherein the first relay UE is the UE which currently provides relay service for the remote UE; wherein the determining that the first relay terminal device UE satisfies the relay reselection condition includes at least one of: determining to send a secondary link Radio Resource Control (RRC) reconfiguration failure message; determining that the first relay UE receives the sidelink RRC reconfiguration failure message; receiving a sidelink RRC reconfiguration failure message sent by the first relay UE; determining that a sidelink RRC reconfiguration flow fails; determining that the secondary link Signaling Radio Bearer (SRB) integrity protection verification fails.

In a second aspect, an embodiment of the present application provides a remote terminal device, including:

a processing module, configured to trigger a relay reselection procedure when it is determined that a first relay terminal device UE meets a relay reselection condition, where the first relay UE is a UE that currently provides a relay service for a remote UE; wherein the determining that the first relay terminal device UE satisfies the relay reselection condition includes at least one of: determining to send a secondary link Radio Resource Control (RRC) reconfiguration failure message; determining that the first relay UE receives the sidelink RRC reconfiguration failure message; receiving a sidelink RRC reconfiguration failure message sent by the first relay UE; determining that a sidelink RRC reconfiguration flow fails; determining that the secondary link Signaling Radio Bearer (SRB) integrity protection verification fails.

In a third aspect, an embodiment of the present application provides a terminal device, including: a memory, a processor and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the method according to the first aspect.

In a fourth aspect, embodiments of the present application provide a readable storage medium, on which a program or instructions are stored, which when executed by a processor, implement the steps of the method according to the first aspect.

In a fifth aspect, an embodiment of the present application provides a reselection method for a relay terminal device, where the method is applied to the relay terminal device, and the method includes:

under the condition that the relay reselection condition is determined to be met, stopping providing the relay service for the remote UE; wherein the determination that the relay reselection condition is satisfied comprises at least one of: determining to send a secondary link Radio Resource Control (RRC) reconfiguration failure message; determining that the remote UE receives the sidelink RRC reconfiguration failure message; receiving the sidelink RRC reconfiguration failure message sent by the remote UE; determining that a sidelink RRC reconfiguration flow fails; determining that the SRB integrity protection verification fails; determining that at least one integrity protection verification failure in data radio bearers DRBs and SRBs based on the Uu interface is determined, wherein the at least one of the DRBs and the SRBs based on the Uu interface is used for transferring data and/or signaling of the remote UE.

In a sixth aspect, an embodiment of the present application provides a relay terminal device, including:

the processing module is used for stopping providing the relay service for the remote UE under the condition that the relay reselection condition is determined to be met; wherein the determination that the relay reselection condition is satisfied comprises at least one of: determining to send a secondary link Radio Resource Control (RRC) reconfiguration failure message; determining that the remote UE receives the sidelink RRC reconfiguration failure message; receiving the sidelink RRC reconfiguration failure message sent by the remote UE; determining that a sidelink RRC reconfiguration flow fails; determining that the SRB integrity protection verification fails; determining that at least one integrity protection verification failure in data radio bearers DRBs and SRBs based on the Uu interface is determined, wherein the at least one of the DRBs and the SRBs based on the Uu interface is used for transferring data and/or signaling of the remote UE.

In a seventh aspect, an embodiment of the present application provides a terminal device, including: a memory, a processor and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the method according to the fifth aspect.

In an eighth aspect, the present application provides a readable storage medium, on which a program or instructions are stored, and when executed by a processor, the program or instructions implement the steps of the method according to the fifth aspect.

In this embodiment of the present application, the remote terminal device UE may trigger a corresponding relay reselection procedure when it is determined that a first relay UE currently providing a relay service for the remote terminal device UE satisfies a relay reselection condition, and specifically, in consideration of some new characteristics of an NR sidelink, the remote terminal device UE may perform relay reselection under various conditions of a radio resource control RRC connection failure of the sidelink. In this way, it can be ensured that the remote UE can always perform traffic transmission on one reliable relay UE.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic diagram of a communication scenario involving a sidelink in an embodiment of the present application;

fig. 2 is a schematic diagram of a communication scenario based on a relay architecture in an embodiment of the present application;

fig. 3 is a schematic flowchart of a reselection method for a relay terminal device in an embodiment of the present application;

fig. 4 is a schematic flowchart of a reselection method for a second relay terminal device in this embodiment of the present application;

fig. 5 is a schematic reselection flow of a relay terminal device in an embodiment of the present application;

fig. 6 is a schematic reselection flow of a second relay terminal device in this embodiment of the present application;

fig. 7 is a schematic reselection flow of a third relay terminal device in this embodiment;

fig. 8 is a schematic reselection flow of a fourth relay terminal device in this embodiment;

fig. 9 is a schematic reselection flow of a fifth relay terminal device in this embodiment of the present application;

fig. 10 is a schematic reselection flow of a sixth relay terminal device in this embodiment of the present application;

fig. 11 is a schematic structural diagram of a remote terminal device in an embodiment of the present application;

fig. 12 is a schematic structural diagram of a relay terminal device in an embodiment of the present application;

fig. 13 is a schematic structural diagram of a terminal device in the embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

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 should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be implemented in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.

The technical scheme of the application can be applied to various communication systems, such as: global System for Mobile communications (GSM), code Division Multiple Access (CDMA) System, wideband Code Division Multiple Access (WCDMA), general Packet Radio Service (GPRS), long Term evolution/enhanced Long Term evolution (LTE-a), NR, and the like.

A UE, which may also be referred to as a Terminal equipment (Mobile Terminal), a Mobile user equipment (ms), or the like, may communicate with one or more core networks via a Radio Access Network (RAN), and the UE may be a Terminal equipment, such as a Mobile phone (or referred to as a "cellular" phone) and a computer having the Terminal equipment, for example, a portable, pocket, hand-held, computer-embedded, or vehicle-mounted Mobile device, which exchanges languages and/or data with the RAN.

The network device, which may also be referred to as a Base Station, may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, an evolved Node B (eNB or e-NodeB) in LTE, and a 5G Base Station (gNB).

In addition, the LTE sidelink is designed to be suitable for specific public safety affairs, such as emergency communication in disaster places such as fire or earthquake, vehicle to internet (V2X) communication, and the like. The communication of the internet of vehicles comprises various services such as basic safety communication, advanced (automatic) driving, formation, sensor expansion and the like. However, since the lte sl only supports broadcast communication, it is mainly used for basic security communication, and other advanced V2X services with strict Quality of Service (QoS) requirements in terms of delay, reliability, etc. are supported by a New Radio (NR) sidelink.

The 5G NR system can be used for an operating frequency band above 6GHz, which is not supported by LTE, and supports larger operating bandwidth. However, the current NR system only supports an interface between a network device (such as a base station) and a terminal device, and does not support a Sidelink interface (which may also be referred to as a PC5 interface) for direct communication between terminal devices.

The SL transmission is mainly divided into three transmission forms, broadcast (broadcast), multicast (groupcast) and unicast (unicast). Wherein, the SL unicast and multicast communication supports a Hybrid automatic repeat request (HARQ) feedback mechanism.

The SL unicast supports PC5 Radio Resource Control (RRC), wherein the sender TX UE supports an RRC reconfiguration (also referred to as RRC connection reconfiguration) procedure for the receiver RX UE, specifically, the TX UE sends a secondary link RRC reconfiguration message (RRC Configuration reconfiguration) to the RX UE, and the RX UE feeds back a secondary link RRC reconfiguration success or failure message to the TX UE according to a specific result.

Further, for a relay architecture system based on sidelink, as shown in fig. 2, in a typical UE-to-network relay scenario, a relay UE needs to transmit data with the network side, but finds the relay UE as its relay due to poor coverage, where the relay UE is a Uu interface with the network device, and the relay UE is a PC5 interface with the relay UE. In general, a relay UE is open and can provide relay service for any remote UE. Of course, in addition to the UE-to-network relay scenario, a UE-to-UE relay scenario is also included, and in this scenario, different terminal devices are connected to two ends of the relay UE.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Referring to fig. 3, an embodiment of the present application provides a relay method for a relay terminal device, where the relay method is executed by a remote terminal device, and the method includes the following steps:

step 101: and under the condition that it is determined that first relay terminal equipment (UE) meets a relay reselection condition, triggering a relay reselection process, wherein the first relay UE is the UE which currently provides the relay service for the remote UE.

Wherein the determining that the first relay terminal device UE satisfies the relay reselection condition includes at least one of: determining to send a secondary link Radio Resource Control (RRC) reconfiguration failure message; determining that the first relay UE receives the sidelink RRC reconfiguration failure message; receiving a secondary link RRC reconfiguration failure message sent by the first relay UE; determining that a sidelink RRC reconfiguration flow fails; and determining that the SRB integrity protection verification fails.

The first relay UE satisfying the relay reselection condition may also be understood as that the first relay UE does not satisfy a condition for providing a relay service for the remote UE.

Wherein, the secondary link signaling radio bearer SRB is used for carrying at least one of the following: activating a secure PC5-S message; a PC5-S message for security protection; secured PC5-RRC message. Wherein the security refers to integrity protection and/or encryption mechanisms.

It is understood that, for the remote UE, the above case of the secondary link RRC connection failure may include at least one of the following: (1) In the event that it is determined that a secondary link RRC reconfiguration failure message has been sent to the first relay UE for which relay service is currently provided, a secondary link RRC connection failure may be determined, such as the scenario illustrated in fig. 6 in which a secondary link RRC reconfiguration message is initiated by a relay UE; (2) In a case where it is determined that a first relay UE currently providing a relay service for the first relay UE receives a secondary link RRC reconfiguration failure message, it may be determined that a secondary link RRC connection fails, such as a scenario shown in fig. 6 in which the relay UE initiates the secondary link RRC reconfiguration message; (3) In a case where it is determined that a sidelink RRC reconfiguration failure message sent by a first relay UE currently providing a relay service for the first relay UE is received, it may be determined that a sidelink RRC connection fails, such as a scenario shown in fig. 5, in which a sidelink RRC reconfiguration message is initiated by a remote UE; (4) In the case that it is determined that the sidelink RRC reconfiguration procedure fails, it may be determined that the sidelink RRC connection fails; (5) In the case that it is determined that the secondary link signaling radio bearer SRB integrity protection verification fails, it may be determined that the secondary link RRC connection fails, as in the scenario illustrated in fig. 9.

Optionally, in the reselection method for the relay UE in the embodiment of the present application, the method may further include the following steps:

sending first information to an upper layer of the remote UE; wherein the first information is used to indicate that the first relay UE satisfies the relay reselection condition.

It can be understood that, after the remote UE triggers the relay reselection procedure, the upper layer may be notified, and at this time, the first relay UE providing the relay service for the remote UE satisfies the relay reselection condition. In this way, when receiving the first information, the upper layer of the remote UE may trigger at least one of a unicast connection release procedure between the remote UE and the first relay UE, and a new unicast connection discovery procedure and a new unicast connection establishment procedure between the remote UE and other relay UEs. The upper layer of the remote UE may refer to an access stratum AS or above.

Optionally, in the reselection method for the relay UE in the embodiment of the present application, on the one hand, the step of sending the first information to the upper layer of the remote UE may be triggered by an AS layer of the remote UE.

Optionally, in the reselection method for the relay UE in the embodiment of the present application, on the other hand, the step of sending the first information to the upper layer of the remote UE may be triggered by the first relay UE. Specifically, the step of sending the first information to the upper layer of the remote UE may specifically be implemented as:

if second information sent by the first relay UE through a sidelink RRC message is received, the first information is sent to an upper layer of the remote UE; the second information is sent by the first relay UE after determining that a secondary link RRC reconfiguration procedure fails, and the second information is used to indicate that the first relay UE satisfies the relay reselection condition.

It can be understood that the notification that the first relay terminal device UE satisfies the relay reselection condition may be received from the first relay UE, and specifically, the determination that the first relay terminal device UE satisfies the relay reselection condition may specifically be that the first relay UE determines that the secondary link RRC reconfiguration procedure fails, at this time, the remote UE may notify an upper layer of the remote UE, and at this time, the first relay UE providing the relay service for the remote UE satisfies the relay reselection condition. In this way, when receiving the first information, the upper layer of the remote UE may trigger at least one of a unicast connection release procedure between the remote UE and the first relay UE, and a new unicast connection discovery procedure and a new unicast connection establishment procedure between the remote UE and other relay UEs.

Optionally, in the reselection method for the relay UE in the embodiment of the present application, when it is determined that the condition that the first relay terminal device UE satisfies the relay reselection condition is that the secondary link RRC reconfiguration procedure fails, the determining that the secondary link RRC reconfiguration procedure fails may be specifically represented as: the remote UE does not receive any Sidelink RRC message within a certain time (or the T400 timer expires), and triggers relay reselection, as shown in the scenario of fig. 7. That is to say, the step of determining that the sidelink RRC reconfiguration procedure fails may be specifically performed as follows:

and if no secondary link RRC message is received in a first preset time period, determining that the secondary link RRC reconfiguration process fails, wherein the starting time of the first preset time period is the time when the remote UE sends the secondary link RRC reconfiguration message to the first relay UE.

Further optionally, after determining that the sidelink RRC reconfiguration procedure fails and triggering the relay reselection procedure, a notification that the relay reselection condition is met may be sent to the first relay UE, so that the first relay UE stops providing the relay service for the remote UE, that is, the method for reselecting the relay UE according to the embodiment of the present application may further include the following steps:

after determining that a sidelink RRC reconfiguration procedure fails, sending third information to the first relay UE; wherein the third information is used to indicate that the first relay UE satisfies the relay reselection condition.

Further optionally, in the reselection method for the relay UE in the embodiment of the present application, the step of sending the third information to the first relay UE may be specifically executed as follows:

and transmitting the third information to the first relay UE through a sidelink RRC message or an upper layer message. Wherein the upper layer message may be of the PC5-S (PC 5 Signaling) type.

In the case of transmitting the third information through the sidelink RRC message, the first relay UE may select to further notify its upper layer (above the access stratum AS) after receiving the third information, and at this time, its service to the remote UE satisfies the relay reselection condition. Further causing an upper layer of the first relay UE to trigger at least one of a unicast connection release procedure between the first relay UE and the remote UE, and a new unicast connection discovery procedure and a new unicast connection establishment procedure between the remote UE and other relay UEs. And for the case of sending the third information through the upper layer message, the upper layer of the first relay UE triggers at least one of a unicast connection release flow between the first relay UE and the remote UE, and a new unicast connection discovery flow and a new unicast connection establishment flow between the remote UE and other relay UEs, in which case, no interaction between the AS layer and the upper layer is required.

Optionally, in the reselection method for the relay UE in the embodiment of the present application, when it is determined that the condition that the first relay terminal device UE satisfies the relay reselection condition is that the verification of the integrity protection of the secondary link signaling radio bearer SRB fails, the following may be further included:

and reporting fourth information to a network device, wherein the fourth information is used for indicating at least one of the failure of the integrity protection verification of the secondary link SRB and the failure of the reconfiguration of the secondary link RRC.

The fourth information may be reported through a Sidelink UE information (Sidelink ueinformationnr) signaling; at this time, the far-end UE may be a UE in an RRC connected state.

Referring to fig. 4, an embodiment of the present application provides a method for reselecting a relay terminal device, where the method is performed by the relay terminal device, and the method includes the following steps:

step 201: and under the condition that the relay reselection condition is determined to be met, stopping providing the relay service for the remote UE.

Wherein determining that the relay reselection condition is satisfied comprises at least one of: determining to send a secondary link Radio Resource Control (RRC) reconfiguration failure message; determining that the remote UE receives the sidelink RRC reconfiguration failure message; receiving the sidelink RRC reconfiguration failure message sent by the remote UE; determining that a sidelink RRC reconfiguration flow fails; determining that the SRB integrity protection verification fails; determining that at least one integrity protection verification failure in data radio bearers DRBs and SRBs based on the Uu interface is determined, wherein the at least one of the DRBs and the SRBs based on the Uu interface is used for transferring data and/or signaling of the remote UE.

In this embodiment of the present application, the relay terminal device UE may stop to continue providing the relay service to the remote UE in time when determining that it meets the relay reselection condition, and specifically, in consideration of some new characteristics of the NR sidelink, the remote UE may perform relay reselection under various conditions where the radio resource control RRC connection of the sidelink fails. In this way, it can be ensured that the remote UE can always perform traffic transmission on one reliable relay UE.

The relay UE satisfying the relay reselection condition may also be understood as that the relay UE does not satisfy a condition for providing a relay service for the remote UE.

It is to be understood that, for the relay UE, the case of the secondary link RRC connection failure may include at least one of the following: (1) In the case that it is determined that the sidelink RRC reconfiguration failure message has been sent to the remote UE that currently provides the relay service, it may be determined that the sidelink RRC connection fails, as in the scenario shown in fig. 5 in which the remote UE initiates the sidelink RRC reconfiguration message; (2) In a case where it is determined that the remote UE currently providing the relay service receives the sidelink RRC reconfiguration failure message, it may be determined that the sidelink RRC connection fails, for example, in a scenario shown in fig. 5, where the remote UE initiates the sidelink RRC reconfiguration message; (3) In a case where it is determined that the sidelink RRC reconfiguration failure message sent by the remote UE currently providing the relay service is received, it may be determined that the sidelink RRC connection fails, for example, in a scenario shown in fig. 6 where the relay UE initiates the sidelink RRC reconfiguration message; (4) In the case that it is determined that the sidelink RRC reconfiguration procedure fails, it may be determined that the sidelink RRC connection fails; (5) In the case that it is determined that the secondary link signaling radio bearer SRB integrity protection verification fails, it may be determined that the secondary link RRC connection fails, as in the scenario shown in fig. 10; (6) In case it is determined that at least one integrity protection verification of the Uu interface based data radio bearers DRB and SRB fails, a secondary link RRC connection failure may be determined, as in the scenario shown in fig. 10.

transmitting fifth information to an upper layer of the relay UE; wherein the fifth information is used for indicating that the relay UE meets the relay reselection condition.

It can be understood that, after the relay UE stops providing the relay service for the remote UE, the relay UE may notify its upper layer, and at this time, the relay UE satisfies the relay reselection condition. In this way, when the upper layer of the terminal UE receives the fifth information, it may trigger at least one of a unicast connection release procedure between the first relay UE and the remote UE, and a new unicast connection discovery procedure and a new unicast connection establishment procedure between the remote UE and another relay UE. Wherein, the upper layer of the relay UE may refer to an access stratum AS or above.

Optionally, in the reselection method for the relay UE in the embodiment of the present application, on the one hand, the step of sending the fifth information to the upper layer of the relay UE may be triggered by an AS layer of the relay UE.

Optionally, in the reselection method for the relay UE in the embodiment of the present application, on the other hand, the step of sending the fifth information to the upper layer of the relay UE may be triggered by the remote UE. Specifically, the step of sending the fifth information to the upper layer of the relay UE may specifically be performed as follows:

if sixth information sent by the remote UE through a sidelink RRC message is received, the fifth information is sent to an upper layer of the relay UE; the sixth information is sent by the remote UE after determining that a sidelink RRC reconfiguration procedure fails, and the sixth information is used to indicate that the relay UE satisfies the relay reselection condition.

It can be understood that the notification that the relay reselection condition is determined to be satisfied may be received from a remote UE served by the relay UE, and specifically, the determination that the relay reselection condition is satisfied may be that the remote UE determines that the secondary link RRC reconfiguration procedure fails, at this time, the relay UE may notify an upper layer of the relay UE, and at this time, the relay UE satisfies the relay reselection condition. In this way, when the upper layer of the relay UE receives the fifth information, it may trigger at least one of a unicast connection release procedure between the relay UE and the remote UE, and a new unicast connection discovery procedure and a new unicast connection establishment procedure between the remote UE and other relay UEs.

Optionally, in the reselection method for the relay UE in the embodiment of the present application, when it is determined that the condition that the relay reselection condition is satisfied is that the sidelink RRC reconfiguration procedure fails, the determining that the sidelink RRC reconfiguration procedure fails may be specifically represented as: the relay UE does not receive any Sidelink RRC message within a certain time (or the T400 timer expires), and terminates providing the relay service to the remote UE, as shown in the scenario of fig. 8. That is to say, the step of determining that the sidelink RRC reconfiguration procedure fails may be specifically performed as follows:

and if no secondary link RRC message is received in a second preset time period, determining that an RRC reconfiguration flow corresponding to a secondary link fails, wherein the starting time of the second preset time period is the time when the relay UE sends the RRC reconfiguration message of the secondary link to the remote UE.

Further optionally, after determining that the sidelink RRC reconfiguration procedure fails and stopping providing the relay service for the remote UE, sending a notification that the relay UE meets the relay reselection condition to the remote UE, so that the remote UE triggers the relay reselection procedure, that is, the method for reselecting the relay UE according to the embodiment of the present application, may further include the following:

after determining that the secondary link RRC reconfiguration procedure fails, sending seventh information to the remote UE; wherein the seventh information is used for indicating that the relay UE meets the relay reselection condition.

Further optionally, in the reselection method for the relay UE in the embodiment of the present application, the step of sending the seventh information to the remote UE may be specifically performed as follows:

and sending the seventh information to the remote UE through a sidelink RRC message or an upper layer message. Wherein the upper layer message may be of the PC5-S (PC 5 Signaling) type.

It should be noted that, for the case of sending the seventh information through the sidelink RRC message, after receiving the seventh information, the remote UE may choose to further notify its upper layer (above the access stratum AS), and at this time, the relay UE providing the relay service for the remote UE satisfies the relay reselection condition. Further causing an upper layer of the remote UE to trigger at least one of a unicast connection release procedure between the remote UE and a relay UE for which relay service is currently provided, and a new unicast connection discovery procedure and a new unicast connection establishment procedure between the remote UE and other relay UEs. And for the case of transmitting the seventh information through the upper layer message, the upper layer of the remote UE triggers at least one of a unicast connection release flow between the remote UE and the relay UE for which the relay service is currently provided, and a new unicast connection discovery flow and a new unicast connection establishment flow between the remote UE and other relay UEs, in which case, no interaction between the AS layer and the upper layer is required.

Optionally, in the reselection method for the relay UE in the embodiment of the present application, when the determining that the condition that the relay reselection condition is satisfied is that the verification of the integrity protection of the secondary link signaling radio bearer SRB fails, the following may be further included:

and reporting eighth information to the network equipment, wherein the eighth information is used for indicating at least one of the failure of the verification of the SRB integrity protection and the failure of the RRC reconfiguration of the sidelink.

The eighth information may be reported through a Sidelink UE information (SidelinkUEInformationNR) signaling; at this time, the relay UE may be a UE in an RRC connected state.

Optionally, in the reselection method for the relay UE in the embodiment of the present application, when the determining that the relay reselection condition is satisfied is that at least one integrity protection verification fails in a data radio bearer DRB and an SRB based on a Uu interface, the method may further include the following steps:

and reporting ninth information to a network device, where the ninth information is used to indicate that at least one integrity protection verification failure in the dru-interface-based DRB and the SRB occurs.

The ninth information may be reported through a Sidelink UE information (SidelinkUEInformationNR) signaling; at this time, the relay UE may be a UE in an RRC connected state.

Referring to fig. 11, an embodiment of the present application provides a remote terminal device 300, where the remote terminal device 300 includes:

a processing module 301, configured to trigger a relay reselection process when it is determined that a first relay terminal device UE meets a relay reselection condition, where the first relay UE is a UE that currently provides a relay service for a remote UE; wherein the determining that the first relay terminal device UE satisfies the relay reselection condition includes at least one of: determining to send a secondary link Radio Resource Control (RRC) reconfiguration failure message; determining that the first relay UE receives the secondary link RRC reconfiguration failure message; receiving a sidelink RRC reconfiguration failure message sent by the first relay UE; determining that a sidelink RRC reconfiguration flow fails; determining that the secondary link Signaling Radio Bearer (SRB) integrity protection verification fails.

Optionally, the remote terminal device 300 according to the embodiment of the present application may further include:

a first sending module, configured to send first information to an upper layer of the remote UE; wherein the first information is used to indicate that the first relay UE satisfies the relay reselection condition.

Optionally, in the remote terminal device 300 according to the embodiment of the present application, the first sending module may be specifically configured to:

if second information sent by the first relay UE through a secondary link RRC message is received, the first information is sent to an upper layer of the remote UE; the second information is sent by the first relay UE after determining that a secondary link RRC reconfiguration procedure fails, and the second information is used to indicate that the first relay UE satisfies the relay reselection condition.

Optionally, in the remote terminal device 300 according to the embodiment of the present application, the processing module 301 may be specifically configured to:

a second sending module, configured to send third information to the first relay UE after determining that the sidelink RRC reconfiguration procedure fails; wherein the third information is used to indicate that the first relay UE satisfies the relay reselection condition.

Optionally, in the remote terminal device 300 according to this embodiment of the application, the second sending module may be specifically configured to:

and sending the third information to the first relay UE through a secondary link RRC message or an upper layer message.

and a reporting module, configured to report fourth information to a network device, where the fourth information is used to indicate at least one of an integrity protection verification failure of the sidelink SRB and an RRC reconfiguration failure of the sidelink.

It can be understood that the remote terminal device 300 provided in the embodiment of the present application can implement the aforementioned method for reselecting a relay terminal device performed by the remote terminal device 300, and relevant descriptions about the method for reselecting a relay terminal device are applicable to the remote terminal device 300, and are not described herein again.

Referring to fig. 12, an embodiment of the present application provides a relay terminal device 400, where the relay terminal device 400 includes:

a processing module 401, configured to stop providing a relay service for a remote UE when it is determined that a relay reselection condition is met; wherein the determination that the relay reselection condition is satisfied comprises at least one of: determining to send a secondary link Radio Resource Control (RRC) reconfiguration failure message; determining that the remote UE receives the sidelink RRC reconfiguration failure message; receiving the sidelink RRC reconfiguration failure message sent by the remote UE; determining that a sidelink RRC reconfiguration flow fails; determining that the SRB integrity protection verification fails; determining that at least one integrity protection verification failure in data radio bearers DRBs and SRBs based on the Uu interface is determined, wherein the at least one of the DRBs and the SRBs based on the Uu interface is used for transferring data and/or signaling of the remote UE.

Optionally, the relay terminal device 400 according to this embodiment of the present application may further include:

a first sending module, configured to send fifth information to an upper layer of the relay UE; wherein the fifth information is used for indicating that the relay UE meets the relay reselection condition.

Optionally, in the relay terminal device 400 in the embodiment of the present application, the first sending module may be specifically configured to:

if sixth information sent by the remote UE through a sidelink RRC message is received, sending the fifth information to an upper layer of the relay UE; the sixth information is sent by the remote UE after determining that a sidelink RRC reconfiguration procedure fails, and the sixth information is used to indicate that the relay UE satisfies the relay reselection condition.

Optionally, in the relay terminal device 400 in the embodiment of the present application, the processing module 401 may be specifically configured to:

a second sending module, configured to send seventh information to the remote UE after determining that the sidelink RRC reconfiguration procedure fails; wherein the seventh information is used for indicating that the relay UE meets the relay reselection condition.

Optionally, in the relay terminal device 400 in the embodiment of the present application, the second sending module may be specifically configured to:

and sending the seventh information to the remote UE through a sidelink RRC message or an upper layer message.

a first reporting module, configured to report eighth information to a network device, where the eighth information is used to indicate at least one of a failure of integrity protection verification of the sidelink SRB and a failure of reconfiguration of the sidelink RRC.

Optionally, the relay terminal device 400 according to the embodiment of the present application may further include:

a second reporting module, configured to report ninth information to a network device, where the ninth information is used to indicate that at least one integrity protection verification failure in the dru interface-based DRB and the SRB occurs.

It can be understood that the relay terminal device 400 provided in the embodiment of the present application can implement the aforementioned method for reselecting a relay terminal device performed by the relay terminal device 400, and relevant descriptions about the method for reselecting a relay terminal device are applicable to the relay terminal device 400, and are not described herein again.

Fig. 13 is a block diagram of a terminal device according to another embodiment of the present application. The terminal device 500 shown in fig. 13 includes: at least one processor 501, memory 502, at least one network interface 504, and a user interface 503. The various components in the terminal device 500 are coupled together by a bus system 505. It is understood that the bus system 505 is used to enable connection communications between these components. The bus system 505 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 505 in FIG. 13.

The user interface 503 may include, among other things, a display, a keyboard, or a pointing device (e.g., a mouse, trackball (trackball), a touch pad or touch screen, etc.

It will be appreciated that the memory 502 in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), enhanced Synchronous SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 502 of the systems and methods described in embodiments herein is intended to comprise, without being limited to, these and any other suitable types of memory.

In some embodiments, memory 502 stores elements, executable modules or data structures, or a subset thereof, or an expanded set thereof as follows: an operating system 5021 and application programs 5022.

The operating system 5021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application programs 5022 include various application programs such as a Media Player (Media Player), a Browser (Browser), etc., for implementing various application services. A program for implementing the method according to the embodiment of the present application may be included in the application 5022.

In this embodiment of the present application, the terminal device 500 further includes: programs or instructions stored on the memory 502 and executable on the processor 501.

Wherein the program or instructions when executed by the processor 501 may implement the steps of:

under the condition that it is determined that first relay terminal equipment (UE) meets a relay reselection condition, triggering a relay reselection process, wherein the first relay UE is the UE which currently provides relay service for the remote UE; wherein the determining that the first relay terminal device UE satisfies the relay reselection condition includes at least one of: determining to send a secondary link Radio Resource Control (RRC) reconfiguration failure message; determining that the first relay UE receives the sidelink RRC reconfiguration failure message; receiving a secondary link RRC reconfiguration failure message sent by the first relay UE; determining that a sidelink RRC reconfiguration flow fails; and determining that the SRB integrity protection verification fails.

Wherein the program or instructions when executed by the processor 501 may further implement the steps of:

The method disclosed in the embodiments of the present application may be applied to the processor 501, or implemented by the processor 501. The processor 501 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 501. The Processor 501 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may reside in ram, flash memory, rom, prom, or eprom, registers, among other computer-readable storage media known in the art. The computer readable storage medium is located in the memory 502, and the processor 501 reads the information in the memory 502 and combines the hardware to complete the steps of the method. In particular, the computer readable storage medium has stored thereon a computer program which, when executed by the processor 501, implements the steps of the embodiments of the reselection method for a relay terminal device as described above.

It is to be understood that the embodiments described in connection with the embodiments disclosed herein may be implemented by hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the Processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units configured to perform the functions described herein, or a combination thereof.

For a software implementation, the techniques described in this application may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described in this application. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

The terminal device 500 can implement each process implemented by the remote terminal device or the relay terminal device in the foregoing embodiments, and details are not repeated here to avoid repetition.

Preferably, an embodiment of the present application further provides a terminal device, which includes a processor, a memory, and a program or an instruction stored in the memory and capable of running on the processor, where the program or the instruction is executed by the processor to implement each process of any one of the embodiments of the reselection method for the relay terminal device, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again.

An 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 reselection method for any relay terminal device, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

The processor is the processor in the terminal device 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.

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 phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like 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 software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network 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 present embodiments are not limited to those precise embodiments, which are intended to be illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope of the appended claims.

Claims

1. A reselection method of a relay terminal device is applied to a remote terminal device (UE), and is characterized in that the method comprises the following steps:

under the condition that it is determined that first relay terminal equipment UE meets a relay reselection condition, triggering a relay reselection process, wherein the first relay terminal equipment UE is terminal equipment UE which currently provides relay service for the remote terminal equipment UE;

wherein the determining that the first relay terminal device UE satisfies the relay reselection condition includes at least one of:

determining to send a secondary link Radio Resource Control (RRC) reconfiguration failure message;

determining that the first relay terminal equipment UE receives the sidelink RRC reconfiguration failure message;

receiving a secondary link RRC reconfiguration failure message sent by the first relay terminal equipment UE;

determining that a sidelink RRC reconfiguration flow fails;

determining that the SRB integrity protection verification fails;

and the secondary link is a new air interface secondary link.

2. The method of claim 1, further comprising:

sending first information to an upper layer of the remote terminal equipment UE;

wherein the first information is used for indicating that the first relay terminal equipment UE meets the relay reselection condition.

3. The method according to claim 2, wherein the sending the first information to the upper layer of the remote terminal device UE comprises:

if second information sent by the first relay terminal equipment UE through a sidelink RRC message is received, the first information is sent to the upper layer of the remote terminal equipment UE;

the second information is sent by the first relay terminal device UE after determining that the sidelink RRC reconfiguration procedure fails, and the second information is used to indicate that the first relay terminal device UE satisfies the relay reselection condition.

4. The method of claim 1, wherein the determining that the secondary link RRC reconfiguration procedure has failed comprises:

and if no secondary link RRC message is received in a first preset time period, determining that the secondary link RRC reconfiguration process fails, wherein the starting time of the first preset time period is the time when the remote terminal equipment UE sends the secondary link RRC reconfiguration message to the first relay terminal equipment UE.

5. The method of claim 4, further comprising:

after determining that the sidelink RRC reconfiguration flow fails, sending third information to the first relay terminal equipment UE; wherein the third information is used for indicating that the first relay terminal equipment UE meets the relay reselection condition.

6. The method according to claim 5, wherein the sending third information to the first relay terminal device UE comprises:

and sending the third information to the first relay terminal equipment UE through a sidelink RRC message or an upper layer message.

7. The method of claim 1, further comprising:

8. A reselection method of a relay terminal device (UE) is applied to the UE, and is characterized in that the method comprises the following steps:

under the condition that the relay reselection condition is determined to be met, stopping providing the relay service for the remote terminal equipment UE; wherein the determination that the relay reselection condition is satisfied comprises at least one of:

determining that the remote terminal equipment UE receives the sidelink RRC reconfiguration failure message;

receiving the secondary link RRC reconfiguration failure message sent by the remote terminal equipment UE;

determining that a sidelink RRC reconfiguration flow fails;

determining that the SRB integrity protection verification fails;

determining that at least one integrity protection verification failure in Data Radio Bearers (DRBs) and/or radio bearers (SRBs) based on a Uu interface is detected, wherein the at least one DRBs and/or SRBs based on the Uu interface are used for transferring data and/or signaling of the remote terminal equipment (UE);

and the secondary link is a new air interface secondary link.

9. The method of claim 8, further comprising:

sending fifth information to an upper layer of the relay terminal equipment UE;

wherein the fifth information is used for indicating that the relay terminal equipment UE meets the relay reselection condition.

10. The method according to claim 9, wherein the sending fifth information to an upper layer of the relay terminal device UE includes:

if receiving sixth information sent by the remote terminal equipment UE through a sidelink RRC message, sending the fifth information to an upper layer of the relay terminal equipment UE;

the sixth information is sent by the remote terminal device UE after determining that a secondary link RRC reconfiguration procedure fails, and the sixth information is used to indicate that the relay terminal device UE satisfies the relay reselection condition.

11. The method of claim 8, wherein the determining that the secondary link RRC reconfiguration procedure has failed comprises:

and if no RRC message of any secondary link is received in a second preset time period, determining that the RRC reconfiguration process corresponding to the secondary link fails, wherein the starting time of the second preset time period is the time when the relay terminal equipment UE sends the RRC reconfiguration message of the secondary link to the remote terminal equipment UE.

12. The method of claim 11, further comprising:

after determining that the sidelink RRC reconfiguration flow is failed, sending seventh information to the remote terminal equipment UE; wherein the seventh information is used for indicating that the relay terminal equipment UE meets the relay reselection condition.

13. The method according to claim 12, wherein said sending seventh information to the remote terminal equipment UE comprises:

and sending the seventh information to the remote terminal equipment UE through a sidelink RRC message or an upper layer message.

14. The method of claim 8, further comprising:

and reporting eighth information to a network device, where the eighth information is used to indicate at least one of a failure of integrity protection verification of the sidelink SRB and a failure of reconfiguration of the sidelink RRC.

15. The method of claim 8, further comprising:

16. A remote terminal device, UE, comprising:

the processing module is used for triggering a relay reselection process under the condition that first relay terminal equipment UE is determined to meet a relay reselection condition, wherein the first relay terminal equipment UE is the terminal equipment UE which provides relay service for the remote terminal equipment UE at present;

determining that a sidelink RRC reconfiguration flow fails;

determining that the SRB integrity protection verification fails;

and the secondary link is a new air interface secondary link.

17. The remote terminal device of claim 16, further comprising:

a first sending module, configured to send first information to an upper layer of the remote terminal device UE; wherein the first information is used for indicating that the first relay terminal equipment UE meets the relay reselection condition.

18. The remote terminal device of claim 17, wherein the first sending module is specifically configured to:

19. The remote terminal device of claim 16, wherein the processing module is specifically configured to:

20. The remote terminal device of claim 19, further comprising:

a second sending module, configured to send third information to the first relay terminal device UE after determining that a sidelink RRC reconfiguration procedure fails; wherein the third information is used for indicating that the first relay terminal equipment UE meets the relay reselection condition.

21. The remote terminal device of claim 20, wherein the second sending module is specifically configured to:

22. The remote terminal apparatus of claim 16, further comprising:

and the reporting module is configured to report fourth information to the network device, where the fourth information is used to indicate at least one of a failure of integrity protection verification of the sidelink SRB and a failure of reconfiguration of the sidelink RRC.

23. A relay terminal device, characterized by comprising:

the processing module is used for stopping providing the relay service for the remote terminal equipment UE under the condition that the relay reselection condition is determined to be met; wherein the determination that the relay reselection condition is satisfied comprises at least one of:

receiving the sidelink RRC reconfiguration failure message sent by the remote terminal equipment UE;

determining that a sidelink RRC reconfiguration flow fails;

determining that the SRB integrity protection verification fails;

determining that at least one integrity protection verification failure in data radio bearers DRBs and SRBs based on a Uu interface is determined, wherein at least one of the DRBs and the SRBs based on the Uu interface is used for transferring data and/or signaling of the remote terminal equipment UE;

and the secondary link is a new air interface secondary link.

24. The relay terminal apparatus according to claim 23, further comprising:

a first sending module, configured to send fifth information to an upper layer of the UE; wherein the fifth information is used for indicating that the relay terminal equipment UE meets the relay reselection condition.

25. The relay terminal device according to claim 24, wherein the first sending module is specifically configured to:

the sixth information is sent by the remote terminal device UE after determining that a sidelink RRC reconfiguration procedure fails, and the sixth information is used to indicate that the relay terminal device UE satisfies the relay reselection condition.

26. The relay terminal device according to claim 23, wherein the processing module is specifically configured to:

and if no secondary link RRC message is received in a second preset time period, determining that an RRC reconfiguration flow corresponding to a secondary link fails, wherein the starting time of the second preset time period is the time when the relay terminal equipment sends the RRC reconfiguration message of the secondary link to the remote terminal equipment UE.

27. The relay terminal apparatus according to claim 26, further comprising:

a second sending module, configured to send seventh information to the remote terminal device UE after determining that the sidelink RRC reconfiguration procedure fails; wherein the seventh information is used for indicating that the relay terminal equipment UE meets the relay reselection condition.

28. The relay terminal device according to claim 27, wherein the second sending module is specifically configured to:

29. The relay terminal apparatus according to claim 23, further comprising:

30. The relay terminal apparatus according to claim 23, further comprising:

31. A terminal device, comprising: a memory, a processor 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 steps of the method of any one of claims 1 to 7; or which when executed by the processor implements the steps of the method of any one of claims 8 to 15.

32. A readable storage medium, characterized in that it stores thereon a program or instructions which, when executed by a processor, implement the steps of the method according to any one of claims 1 to 7; or which when executed by the processor implements the steps of the method of any one of claims 8 to 15.