CN114765906A

CN114765906A - Method and user equipment

Info

Publication number: CN114765906A
Application number: CN202110039265.2A
Authority: CN
Inventors: 刘蕾; 罗超; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2022-07-19
Also published as: WO2022152111A1

Abstract

The invention provides a method executed by user equipment and the user equipment. The method performed by the user setting comprises: the method comprises the steps that a wireless access AS layer of User Equipment (UE) determines a sidestream communication DRX parameter, the wireless access AS layer informs a V2X layer of the UE of first configuration information, and the V2X layer prolongs the duration of a PC5 unicast link keep-alive timer according to the first configuration information.

Description

Method and user equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method for performing sidestream DRX by a user equipment and a corresponding user equipment.

Background

In 6.2018, release 16 was approved based on the V2X feasibility Study Project of 5G NR networking technology (see non-patent document: RP-181480, New SID Proposal: Study on NR V2X) at the 3rd Generation Partnership Project (3 GPP) RAN #80 Congress. The NR V2X of release 16 contains the main functionality to support unicast, multicast and broadcast in both non-network overlay and network overlay scenarios.

In 12 months of 2019, at 3GPP RAN #86 congregation, Rel-17 was approved for the project of enhanced sidelink communication (NR sidelink enhancement) based on 5G NR network technology (see non-patent document: RP-193257 New WID on NR sidelink enhancement). The latest version of this project is referred to non-patent literature: RP-202846 WID NR Sidelink Enhancement.

The research goals of enhanced NR sidestream communication mainly include two aspects: the power consumption (power saving) of the user equipment is reduced, the reliability of the side-line communication is enhanced, and the communication delay is reduced. In order to support the reduction of power consumption of the ue, a specific research objective includes supporting the sidestream DRX for broadcast, multicast and unicast.

The present invention discusses the problems associated with communicating DRX in a unicast scenario.

Disclosure of Invention

The invention aims to provide a method for prolonging the time length of a unicast link keep-alive timer of a PC5 when a user equipment executes a sidelink communication DRX and the corresponding user equipment.

According to an aspect of the present invention, there is provided a method performed by a user equipment, comprising a radio access AS layer of the user equipment, UE, determining a sidestream communication, DRX, parameter, the radio access AS layer informing a V2X layer of the UE of first configuration information, and the V2X layer extending a duration of a PC5 unicast link keep-alive timer according to the first configuration information.

In the method performed by the user equipment, the method for the radio access AS layer to determine the sidestream communication DRX parameter includes at least one of the following methods: determining according to a sidestream communication DRX configuration in a system message or RRC dedicated signaling received from a base station; determined according to the service type or QoS characteristics indicated by the V2X layer; according to PC5 RRC message received from opposite terminal UE or side communication DRX configuration determination in MAC CE; determining according to the sidestream communication DRX configuration negotiated with the opposite terminal UE; and is determined according to the protocol specification value.

In the method executed by the ue, the first configuration information includes at least one of the following information: the first configuration information is part of the sidestream communication DRX parameters; the first configuration information is all the sidestream communication DRX parameters; the first configuration information is a DRX period which is set to be 0 or an invalid value and is determined according to the sidestream communication DRX parameter configuration; the first configuration information is an indication that the sidestream communication DRX parameter is configured; the first configuration information is an indication to extend a link keep alive timer; the first configuration information is the time length of the extended link keep-alive timer; and the first configuration information is the time length prolonged by the link keep-alive timer.

In the above method performed by the user equipment, after receiving the first configuration information, the V2X layer extends the duration of the PC5 unicast link keep-alive timer, which includes at least one of the following methods: prolonging the duration of a T5003/T5004 timer by a DRX period indicated by the first configuration information; prolonging the duration of a T5003/T5004 timer by the product obtained by multiplying the DRX period indicated by the first configuration information by a coefficient; prolonging the time length of the T5003/T5004 timer by the prolonged time length of the link keep alive timer indicated by the first configuration information; the time length of the T5003/T5004 timer is prolonged by the product obtained by multiplying the prolonged time length of the link keep alive timer indicated by the first configuration information by a coefficient; setting the duration of the T5003/T5004 timer as the duration of the extended link keep-alive timer indicated by the first configuration information; and extending the duration of the T5003/T5004 timer by a fixed duration.

According to another aspect of the invention, a method performed by a user equipment comprises the steps of: the method comprises the steps that a wireless access AS layer of User Equipment (UE) determines to stop lateral communication (DRX), the wireless access AS layer informs a V2X layer of the UE of first stop information, and the V2X layer stops prolonging the duration of a PC5 unicast link keep-alive timer according to the first stop information.

In the method performed by the user equipment, the method for the radio access AS layer to determine to stop the sidestream communication DRX includes at least one of the following methods: releasing the sidestream communication DRX configuration according to a system message or RRC special signaling received from the base station; traffic type or QoS characteristics as indicated by the V2X layer; according to the releasing sidelink communication DRX configuration indicated in the PC5 RRC message or the MAC CE received from the opposite UE; and according to the result of negotiation with the opposite-end UE.

In the method performed by the user equipment, the first stop information includes at least one of the following information: the first stop information is an instruction for stopping the side communication DRX; the first stop information is a sidestream communication DRX period set to 0 or an invalid value; the first stop information is an indication to stop extending a link keep-alive timer; the first stop information is a link keep-alive timer duration set to 0 or an invalid value; and the first stop information is the length of time that the link keep-alive timer set to 0 or an invalid value is extended.

In the above method performed by the user equipment, the method for stopping extending the duration of the PC5 unicast link keep-alive timer after the V2X layer receives the DRX information includes at least one of the following methods: the time length of the T5003/T5004 timer is not prolonged any more; and returning the value of T5003/T5004 to the original value of T5003/T5004.

According to another aspect of the present invention, there is also provided a user equipment, including: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform the methods provided by the above aspects.

According to the method provided by the invention, in the enhanced sidestream communication, when the sidestream communication DRX is introduced, the sidestream communication user equipment can be ensured to reasonably set the time length of the related timer of the keep-alive flow of the unicast link of the PC5, unnecessary signaling interaction is reduced, and the abnormal release of the unicast link of the PC5 is prevented, so that the power consumption is ensured to be reduced, and the reliability of the sidestream communication is improved.

Drawings

Fig. 1 is a schematic diagram for explaining a PC5 unicast link keep-alive flow.

Fig. 2 is a flowchart of a method of extending a keep-alive timer according to embodiment 1 of the invention.

Fig. 3 is a flowchart of a stop-extending-keep-alive timer method according to embodiment 2 of the present invention.

Fig. 4 is a block diagram schematically illustrating a structure of a user equipment UE according to the present invention.

Detailed Description

The invention is described in detail below with reference to the drawings and the detailed description. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of brevity, detailed descriptions of well-known technologies not directly related to the present invention are omitted so as to prevent the confusion of the understanding of the present invention.

Some terms related to the present invention are described below, and specific meanings of the terms are shown in the latest standard specification of 3GPP, such as TS38.300, TS38.331, TS36.300, TS36.331, and the like. Unless otherwise indicated, all terms referred to in the present invention have the following meanings.

The UE: user Equipment

NR: new Radio New generation wireless technology

RRC: radio Resource Control

RRC _ CONNECTED: RRC connected state

RRC _ INACTIVE: RRC inactive state

RRC _ IDLE: RRC idle state

RAN: radio Access Network, Radio Access stratum

Sidelink: sidelink communications

SDAP: service Data Adaptation Protocol

SCI: sidelink Control Information, Sidelink communication Control Information

RSRP: reference Signal Receiving Power, Reference Signal Receiving Power

PSCCH: physical Sidelink Control Channel, Physical Sidelink communication Control Channel

PSSCH: physical Sidelink Shared Channel, a Physical Sidelink Shared Channel

And AS: access Stratum, Access Stratum

DL: downlink, Downlink

IE: information Element, Information Element

CE: control Element, Control Element

MIB: master Information Block, Master Information Block

NR: new Radio, New Radio

SIB: system Information Block

NG-RAN: NG Radio Access Network, a new generation Radio Access Network

5 GC: 5G Core Network, 5G Core Network

PDU: protocol Data Unit (PDU)

SDU: service Data Unit

DRX: discontinuous Reception, Discontinuous Reception

V2X: Vehicle-to-Everything

MAC: medium Access Control, Medium Access Control

QoS: quality of Service

In the invention, a network, a base station and a RAN can be used interchangeably, and the network can be a long term evolution LET network, a New radio access technology (New RAT, NR) network, an enhanced long term evolution eLTE network or other networks defined in subsequent evolution versions of 3 GPP.

In the present invention, the UE may refer to an NR device supporting an NR Sidelink function described in the background art, or may refer to another type of NR device or an LTE device.

The PC5 interface is an interface for control plane and user plane Sidelink communications between UEs. For Sidelink unicast, the PC5-RRC connection is an AS layer logical connection between a pair of source layer two IDs and target layer two IDs. A PC5 unicast link establishment would correspond to a PC5-RRC connection establishment.

After the sidestream communication DRX is adopted, the UE does not continuously monitor or receive the downlink channel, but periodically wakes up to receive or monitor the sidestream communication channel for a period of time, and the period may be referred to as a sidestream communication DRX period or a sidestream communication DRX cycle.

In the sidestream communication unicast scenario, the PC5 unicast link keep alive procedure at the V2X layer is used to maintain the PC5 unicast link between the two UEs, i.e. check whether the link between the two UEs is valid through signaling interaction. The UEs at both ends of a unicast link of the PC5 can be the initiators of keep-alive procedures, and when one UE is the initiating UE, the other UE is the target UE. Fig. 1 is a schematic diagram for explaining a PC5 unicast link keep-alive flow. Link keep-alive procedure As shown in figure 1, the initiating UE triggers the link keep-alive procedure by maintaining a keep-alive timer T5003. Whenever the initiating UE receives PC5 signaling or PC5 user data sent by the target UE, the initiating UE starts or restarts the T5003 timer. When T5003 times out, the initiating UE triggers a keep-alive procedure, i.e., sends a direct link keep-alive REQUEST message (DIRECT LINK KEEPALIVE REQUEST) to the target UE, stopping T5003 and starting T5004. T5004 is stopped and T5003 is started when a direct link keep-alive RESPONSE message (DIRECT LINK KEEPALIVE RESPONSE) of the target UE is received before T5004 times out. When the T5004 times out and does not receive the target UE link keep-alive response message, the initiating UE will resend the link keep-alive request message and start the T5004. When the maximum number of retransmissions is reached, the initiating UE releases the PC5 unicast link. Meanwhile, the initiating UE may carry the maximum inactivity period in the direct link keep-alive request message, the target UE starts the T5005 timer after receiving the message, and the target UE does not need to initiate a keep-alive procedure before the T5005 times out.

When introducing the sidestream DRX, the UE does not continuously monitor or receive the sidestream channel, so the relevant timer in the existing PC5 unicast link keep-alive procedure needs to be extended to avoid unnecessary link keep-alive signaling procedure and possible link abnormal release.

Several embodiments of how to extend the PC5 unicast link keep alive procedure related timer duration after introduction of the sidestream traffic DRX, and how to trigger and stop the extension timer are described in detail below.

Example 1

In embodiment 1 of the present invention, as shown in fig. 2, the steps performed by the user equipment UE include: and steps S101, S103 and S105.

In step S101, the AS layer of the UE determines (or obtains, or receives) sidelink communication DRX parameters (including but not limited to DRX cycle, etc.), and the method includes the following possibilities:

1) according to the configuration of the base station: such as through system messages or RRC-specific signaling;

2) according to the pre-configuration;

3) according to the service type or QoS characteristics indicated by the upper layer (i.e., V2X layer);

4) according to the configuration of the opposite terminal UE: through PC5 RRC message or MAC CE, etc

5) According to the result of negotiation with the opposite terminal UE;

6) the values are specified according to the protocol.

The AS layer of the UE may refer to an RRC layer or a MAC layer.

Meanwhile, the AS layer of the UE may determine (or obtain, or receive) the sidestream DRX parameters, or may be a result of combining or comprehensively considering the sidestream DRX parameters in the above-mentioned various methods. For example, a PC5 unicast link exists between a UE and multiple peer UEs, and different sidelink communication DRX parameter configurations configured by the multiple peer UEs may be obtained, at this time, the UE may perform union operation, intersection operation, minimum value, maximum value, or the like on multiple DRX parameters.

The UE determines (or acquires or receives) the sidestream communication DRX parameter, and the sidestream communication DRX parameter is configured, or is executed, or is used, or is configured to the bottom layer.

Optionally, the AS layer of the UE may also determine whether to extend the link keep-alive timer according to the determined DRX parameter, or determine a time for which the link keep-alive timer is extended or extended. For example, but not limiting of, if a DRX cycle is configured, the link keep-alive timer is extended; or the time length prolonged by the link keep-alive timer is the DRX cycle time length in the DRX parameters; or, if the DRX parameter is not configured or released, the length of time that the link keep-alive timer is extended is set to 0 or an invalid value.

In step S103, optionally, the AS layer of the UE notifies the upper layer (i.e. the V2X layer) of the first configuration information, where the first configuration information includes the following possibilities:

1) partial sidelink communication DRX parameter (i.e. one or more of them): such as DRX cycle, inactivity time, etc

2) All sidestream communication DRX parameters;

3) if no DRX parameter is configured or the DRX parameter is released in the step 101, the side communication DRX period is set to be 0 or an invalid value when the side communication DRX information of the V2X layer is informed;

4) an indication that sidestream communication, DRX, is configured;

5) an indication to extend (or extend, or adjust) the link keep-alive timer;

6) the length of time that the link keep-alive timer extends or extends;

7) the time length after the link keep-alive timer is extended is the link keep-alive timer time length.

The AS layer of the UE may refer to an RRC layer or a MAC layer.

In step S105, the upper layer (i.e., the V2X layer) extends the PC5 unicast link keep alive timer duration according to the first configuration information received from the AS layer.

For T5003, a possible timer duration extension method is at least one of the following methods:

1) extending the value of T5003 by the sidestream communication DRX cycle (or DRX cycle) indicated in the first configuration information, i.e. the value of T5003 is equal to the original value of T5003 plus the DRX cycle (or DRX cycle);

2) Extending the value of T5003 by the coefficient of the sidestream communication DRX cycle (or DRX cycle) indicated in the first configuration information, i.e. the value of T5003 is equal to the original value of T5003 plus the coefficient of the DRX cycle (or DRX cycle), which may be an integer, a decimal, or a fraction;

3) extending the value of T5003 by the extended or extended time of the link keep-alive timer indicated in the first configuration information, that is, the value of T5003 is equal to the original value of T5003 plus the extended or extended time of the link keep-alive timer;

4) a coefficient for extending the value of T5003 by the link keep alive timer extension or extended time indicated in the first configuration information, that is, the value of T5003 is equal to the original value of T5003 plus the coefficient for the link keep alive timer extension or extended time, and the coefficient may be an integer, a decimal or a fraction;

5) setting the time length of the link keep alive timer indicated in the first configuration information to be T5003;

6) the value of T5003 is extended by some fixed length of time.

For T5004, a possible timer duration extension method is the same as the timer duration extension method of T5003, and T5003 in the above-mentioned T5003 timer duration extension method may be replaced by T5004, which is not described again.

Example 2

Based on embodiment 1, in embodiment 2 of the present invention, as shown in fig. 3, the steps performed by the user equipment UE include: steps S201, S203, S205.

In step S201, the AS layer of the UE determines (or acquires, or receives) to stop (or release, or disable) the sidelink communications DRX, and the method includes the following possibilities:

1) according to the configuration of the base station: releasing the sidestream communication DRX configuration, such as through system messages or RRC dedicated signaling;

2) according to the service type or QoS characteristics indicated by the upper layer (i.e., V2X layer);

3) according to the configuration of the opposite terminal UE: releasing the sidestream communication DRX configuration through a PC5 RRC message or a MAC CE and the like;

4) according to the result of negotiation with the opposite terminal UE.

The AS layer of the UE may refer to an RRC layer or a MAC layer.

Optionally, the AS layer of the UE may also determine whether to stop the extended link keep-alive timer according to the determination to stop the sidestream communication DRX. For example, but not limiting of, if the DRX configuration is released, the extended link keep-alive timer is stopped.

In step S203, optionally, the AS layer of the UE notifies the upper layer (i.e., the V2X layer) of the first stop information, where the first stop information includes the following possibilities:

1) a sidestream communication DRX period (or DRX cycle) which takes a value of 0 or an invalid value;

2) an indication to stop sidestream communications, DRX;

3) an indication to stop extending (or extending, or adjusting) the link keep-alive timer;

4) the time length of the link keep-alive timer is expanded or prolonged, and the value is 0 or an invalid value;

5) The time after the time length of the link keep-alive timer is prolonged is 0 or an invalid value.

The AS layer of the UE may refer to an RRC layer or a MAC layer.

In step S205, if the upper layer (i.e., V2X layer) receives the first stop information of the AS layer, the extension of the PC5 unicast link keep timer duration is stopped. The value of T5003 is rolled back to the original value of T5003 or T5003 is not extended or extended. The value of T5004 is rolled back to the original value of T5004 or T5004 is not extended or extended.

Example 3

Optionally, AS another implementation method of step 105, the upper layer (i.e. the V2X layer) sets link keep-alive timers T1 and T2 after the adoption of the sidestream communication DRX according to the first configuration information received from the AS layer, and replaces T5003 with T1 and replaces T5004 with T2. In the unicast link protection flow after the sidestream communication DRX is adopted, the starting restart and the timeout processing of T1 are the same as those of T5003, and the starting restart and the timeout of T2 are the same as those of T5004.

The time length setting method of T1 is at least one of the following methods:

1) setting a value of T1 to a T5003 value plus a DRX cycle (or DRX cycle) indicated in the first configuration information;

2) setting the value of T1 to the value of T5003 plus a coefficient of the DRX cycle (or DRX cycle) indicated in the first configuration information, which may be an integer, a decimal, or a fraction;

3) Setting the value of T1 to the value of T5003 plus the time for which the link keep-alive timer indicated in the first configuration information is extended or lengthened;

4) setting the value of T1 to a T5003 value plus a coefficient, which may be an integer, fractional, or fractional number, of the link keep alive timer extension or time indicated in the first configuration information;

5) setting the setting of T1 as the extended duration of the link keep alive timer indicated in the first configuration information;

6) the value of T1 is set to the value of T5003 plus some fixed length of time.

The time length setting method of T2 is at least one of the following methods:

1) setting a value of T2 to a value of T5004 plus a DRX cycle (or DRX cycle) indicated in the first configuration information;

2) setting the value of T2 to the value of T5004 plus a coefficient of the DRX cycle (or DRX cycle) indicated in the first configuration information, which may be an integer, a decimal, or a fraction;

3) setting the value of T2 to the value of T5004 plus the link keep alive timer extension or extended time indicated in the first configuration information;

4) setting the value of T2 to a T5004 value plus a coefficient, which may be an integer, fractional, or fractional number, of the link keep alive timer extension or time indicated in the first configuration information;

5) Setting the setting of T2 as the extended duration of the link keep alive timer indicated in the first configuration information;

6) the value of T2 is set to the value of T5004 plus some fixed length of time.

Example 4

Optionally, AS another implementation method of step 205, the upper layer (i.e. the V2X layer) does not use T1 and T2 to control the link keep-alive flow any more, but uses T5003 and T5004 to control the flow according to the first stop information received from the AS layer.

Fig. 4 is a block diagram schematically illustrating a user equipment UE according to the present invention. As shown in fig. 4, the user equipment UE400 includes a processor 401 and a memory 402. The processor 401 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like. The memory 402 may include, for example, volatile memory (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, among others. The memory 402 has stored thereon program instructions. Which when executed by the processor 401 may perform the above-described method performed by the user equipment as detailed in the present invention.

The program running on the apparatus according to the present invention may be a program that causes a computer to realize the functions of the embodiments of the present invention by controlling a Central Processing Unit (CPU). The program or information processed by the program may be temporarily stored in a volatile memory (such as a random access memory RAM), a Hard Disk Drive (HDD), a nonvolatile memory (such as a flash memory), or other memory system.

A program for implementing the functions of the embodiments of the present invention may be recorded on a computer-readable recording medium. The corresponding functions can be realized by causing a computer system to read the programs recorded on the recording medium and execute the programs. The term "computer system" as used herein may be a computer system embedded in the device and may include an operating system or hardware (e.g., peripheral devices). The "computer-readable recording medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium that stores a program for short-term dynamics, or any other recording medium that is readable by a computer.

Various features or functional blocks of the devices used in the above-described embodiments may be implemented or performed by circuitry (e.g., a single or multiple chip integrated circuits). Circuitry designed to perform the functions described herein may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The circuit may be a digital circuit or an analog circuit. Where new integrated circuit technologies have emerged as a replacement for existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.

Further, the present invention is not limited to the above-described embodiments. While various examples of the embodiments have been described, the invention is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors may be used as terminal devices or communication devices, such as AV devices, kitchen devices, cleaning devices, air conditioners, office equipment, vending machines, and other home appliances.

As above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the specific configuration is not limited to the above embodiment, and the present invention includes any design modification without departing from the gist of the present invention. In addition, the present invention can be variously modified within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the present invention. Further, components having the same effects described in the above embodiments may be substituted for each other.

Claims

1. A method performed by a user equipment, comprising the steps of:

the radio access AS layer of the user equipment UE determines the sidestream traffic DRX parameters,

the radio access AS layer informs a V2X layer of the UE of the first configuration information, an

The V2X layer extends the duration of a PC5 unicast link keep alive timer according to the first configuration information.

2. The method of claim 1, wherein,

the method for determining the DRX parameter of the sidestream communication by the wireless access AS layer comprises at least one of the following methods:

determining according to a sidestream communication DRX configuration in a system message or RRC dedicated signaling received from a base station;

determined according to the service type or QoS characteristics indicated by the V2X layer;

according to PC5 RRC message received from opposite terminal UE or side communication DRX configuration determination in MAC CE;

determining according to the sidestream communication DRX configuration negotiated with the opposite terminal UE; and

determined according to protocol specification values.

3. The method of claim 1, wherein,

the first configuration information includes at least one of the following information:

the first configuration information is part of the sidestream communication DRX parameters;

the first configuration information is all the sidestream communication DRX parameters;

the first configuration information is a DRX period which is set to be 0 or an invalid value and is determined according to the sidestream communication DRX parameter;

the first configuration information is an indication that the sidestream communication DRX parameter is configured;

the first configuration information is an indication of an extended link keep-alive timer;

The first configuration information is the time length prolonged by the link keep-alive timer; and

the first configuration information is the time length of the extended link keep-alive timer.

4. The method of claim 1, further comprising,

after the V2X layer receives the first configuration information, the method for extending the duration of the PC5 unicast link keep-alive timer includes at least one of the following methods:

prolonging the duration of a T5003/T5004 timer by a DRX period indicated by the first configuration information;

prolonging the duration of a T5003/T5004 timer by the product obtained by multiplying the DRX period indicated by the first configuration information by a coefficient;

prolonging the time length of the T5003/T5004 timer by the prolonged time length of the link keep alive timer indicated by the first configuration information;

the time length of the T5003/T5004 timer is prolonged by the product obtained by multiplying the prolonged time length of the link keep alive timer indicated by the first configuration information by a coefficient;

setting the duration of the T5003/T5004 timer as the duration of the extended link keep-alive timer indicated by the first configuration information; and

the duration of the T5003/T5004 timer is extended by a fixed duration.

5. A method performed by a user equipment, comprising the steps of:

The radio access AS layer of the user equipment UE determines to stop the sidestream communication DRX,

the radio access AS layer informs a V2X layer of the UE of the first stop information, an

The V2X layer stops lengthening the PC5 unicast link keep alive timer duration according to the first stop information.

6. The method of claim 5, wherein,

the method for the wireless access AS layer to determine the side communication DRX stopping comprises at least one of the following methods:

releasing the sidestream communication DRX configuration according to a system message or RRC private signaling received from the base station;

according to the service type or QoS characteristics indicated by the V2X layer;

according to the releasing sidelink communication DRX configuration indicated in the PC5 RRC message or the MAC CE received from the opposite UE; and

according to the result of negotiation with the opposite terminal UE.

7. The method of claim 5, wherein,

the first stop information includes at least one of the following information:

the first stop information is an instruction for stopping the side communication DRX;

the first stop information is a sidestream communication DRX period set to 0 or an invalid value;

the first stop information is an indication to stop extending a link keep-alive timer;

the first stop information is a link keep-alive timer duration set to 0 or an invalid value; and

The first stop information is a length of time extended by a link keep-alive timer set to 0 or an invalid value.

8. The method of claim 5, further comprising,

the method for stopping prolonging the time length of the PC5 unicast link keep-alive timer after the V2X layer receives the DRX information comprises at least one of the following methods:

the time length of the T5003/T5004 timer is not prolonged any more; and

the value of T5003/T5004 is returned to the original value of T5003/T5004.

9. A user equipment, comprising:

a processor; and

a memory storing instructions;

wherein the instructions, when executed by the processor, perform: the method of any one of claims 1 to 4; or the method according to any one of claims 5-8.