WO2022228419A1 - 由侧行通信远端ue执行的方法及用户设备 - Google Patents

由侧行通信远端ue执行的方法及用户设备 Download PDF

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Publication number
WO2022228419A1
WO2022228419A1 PCT/CN2022/089211 CN2022089211W WO2022228419A1 WO 2022228419 A1 WO2022228419 A1 WO 2022228419A1 CN 2022089211 W CN2022089211 W CN 2022089211W WO 2022228419 A1 WO2022228419 A1 WO 2022228419A1
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Prior art keywords
remote
timer
sideline communication
relay
rrc
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PCT/CN2022/089211
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English (en)
French (fr)
Inventor
刘蕾
刘仁茂
常宁娟
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夏普株式会社
刘蕾
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Application filed by 夏普株式会社, 刘蕾 filed Critical 夏普株式会社
Priority to US18/288,013 priority Critical patent/US20240224172A1/en
Priority to EP22794889.0A priority patent/EP4333504A1/en
Publication of WO2022228419A1 publication Critical patent/WO2022228419A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H04W40/246—Connectivity information discovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to the technical field of wireless communication, and more particularly, the present invention relates to a method for performing sideline communication relay selection reselection by a user equipment and a corresponding user equipment.
  • a remote UE may need to select a relay UE (relay UE) to provide it with relay services.
  • relay UE relay UE
  • the remote UE selects a relay UE to serve itself, it may perform relay reselection due to various situations.
  • the present invention discusses the processing of remote UE in selection and reselection scenarios.
  • the present invention provides a method performed by a remote user equipment of sidelink communication and the user equipment, which can initiate an access attempt to the network in time when selecting or reselecting a sidelink relay UE, reducing the need for delay to ensure service quality.
  • a method performed by a remote UE of sideline communication including: the remote UE of sideline communication outside the coverage area receives a discovery message sent by a relay UE of sideline communication, and saves the discovery message
  • the first cell identifier carried in the message is the current cell identifier; receiving the system message forwarded by the sideline communication relay UE; initiating RRC connection establishment, executing the access control process, and starting the first timer when the access is prohibited; During the running period of the first timer, if the first condition is satisfied, then: stop the first timer and execute the disabling of the prohibition.
  • the first cell identity includes at least one of the following forms: a physical cell identity; a global cell identity; and an NR cell identity.
  • the first condition includes at least one of the following: selection or reselection of the sideline communication relay UE occurs; and the cell identifier of the sideline communication relay UE selected or reselected is different from the current cell.
  • the first timer includes at least one of the following: T390; and a timer for controlling the access control performed by the remote UE of the sideline communication.
  • the sideline communication relay UE does not carry the cell identifier in the discovery message, during the running of the first timer, if selection or reselection of the sideline communication relay UE occurs, then: stop the first timer. The timer is executed to cancel the prohibition.
  • the remote UE of the sideline communication in the RRC_IDLE state initiates RRC connection establishment, and starts the T300 or T302 timer; and during the operation of T300 or T302 , if the first condition is satisfied, then: the remote UE of the sideline communication performs the action of entering the RRC_IDLE state, and notifies the upper layer of the RRC connection release reason.
  • the remote UE of the sideline communication in the RRC_INACTIVE state initiates RRC connection recovery, and starts the T319 or T302 timer; and during the operation of T319 or T302 , if the first condition is satisfied, then: the remote UE of the sideline communication performs the action of entering the RRC_IDLE state, and notifies the upper layer of the RRC connection release reason.
  • the remote UE of the sideline communication in the RRC_CONNECTED state initiates RRC connection re-establishment, and starts the T311 timer; and during the operation of T311, if the first A condition, then: the remote UE of the sideline communication stops T311.
  • a user equipment comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, execute the method according to any one of claims 1 to 8. method described.
  • FIG. 1 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 1 of the present invention.
  • FIG. 2 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 2 of the present invention.
  • FIG. 3 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 3 of the present invention.
  • FIG. 4 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 4 of the present invention.
  • FIG. 5 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 5 of the present invention.
  • FIG. 6 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 6 of the present invention.
  • FIG. 7 is a schematic structural block diagram of the user equipment UE involved in the present invention.
  • UE User Equipment user equipment
  • RRC Radio Resource Control Radio Resource Control
  • RRC_IDLE RRC idle state
  • Radio Access Network Radio Access Layer
  • SCI Sidelink Control Information, side communication control information
  • MIB Master Information Block, the main information block
  • SIB System Information Block, system information block
  • NG-RAN NG Radio Access Network, a new generation of radio access network
  • PLMN Public Land Mobile Network, public land mobile network
  • PCI Physical Cell Identifier, physical cell identifier
  • CGI Cell Global Identifier, global cell identifier
  • NCI NR Cell Identity, NR Cell Identity
  • MAC Medium Access Control, medium access control
  • DCI Downlink Control Information, downlink control information
  • network, base station and RAN can be used interchangeably, and the network can be a long-term evolution LTE network, a new radio access technology (New RAT, NR) network, an enhanced long-term evolution eLTE network, or a subsequent evolution version of 3GPP other networks as defined in .
  • New RAT new radio access technology
  • eLTE enhanced long-term evolution eLTE network
  • the user equipment UE may refer to the NR device supporting the NR Sidelink relay function described in the background art, or may refer to other types of NR devices or LTE devices.
  • NCGI is used to identify an NR cell globally.
  • NCGI is composed of PLMN ID and NCI. NCI is indicated by the CellIdentity information element in the system message.
  • the UE when the UE finds that its access type is prohibited according to the system message broadcasted by the network, it calculates the access prohibition time according to the information in the system message, starts the T390 timer, and does not stop the access during the running of the timer. Then access to the originating network.
  • the T300 timer is started.
  • the T302 timer is started according to the waitTime information element in the message.
  • the T311 timer is started.
  • the T319 timer is started.
  • the PC5 interface is an interface for sidelink communication between the UE and the control plane and the user plane.
  • the PC5-RRC connection is an AS layer logical connection between a pair of source layer two IDs and target layer two IDs.
  • Figure 8 is a schematic diagram showing scenarios 1 to 3 of UE-to-Network relaying.
  • Figure 8(a) shows scenario 1 when the remote UE is out of coverage
  • Figure 8(b) shows that the remote UE is covered Scenario 2 within the range
  • (c) of Figure 8 represents scenario 3 in which the remote UE and the relay UE are in different cells.
  • scenario 1 and 2 the left side is the remote UE
  • the middle is the relay UE
  • the right side is the network
  • scenario 3 the two sides are the network
  • the middle is the remote UE from left to right. and relay UE.
  • the remote UE and the relay UE are connected through the PC5 interface, and the relay UE and the network are connected through the Uu interface. Since the remote UE is far from the network or the communication environment is poor, the relay UE needs to relay and forward the signaling and data between the two.
  • the scenarios of UE-to-Network relay include:
  • Both the Remote UE and the Relay UE are within the coverage and in the same cell;
  • Both the Remote UE and the Relay UE are within the coverage, but in different cells.
  • FIG. 9 is a schematic diagram showing UE-to-UE relay. As shown in Figure 9, the left and right sides are the remote UEs, and the middle is the relay UE. The remote UE and the relay UE are respectively connected through the PC5 interface. Since the two remote UEs are far apart or the communication environment is poor, the relay UE needs to relay and forward the signaling and data between the two.
  • UE-to-UE relay scenarios include:
  • both remote UEs ie, source-side UE and target-side UE
  • relay UEs are within coverage
  • Partial coverage among the two remote UEs and the relay UE, at least one UE is in coverage, and at least one UE is out of coverage.
  • the Remote UE After the Remote UE selects a relay UE to provide relay services for itself, it will establish a PC5-RRC connection with the relay UE to communicate with the network through the relay UE.
  • the Remote UE can establish an air interface RRC connection with the network through the relay UE for data transmission between the remote UE and the network.
  • the Remote UE encapsulates the RRC connection establishment, re-establishment, recovery and other messages to the network in a PC5 message and sends it to the relay UE, and the relay UE forwards it to the network after receiving it.
  • the RRC message replied by the network is encapsulated in a PC5 message by the relay UE and forwarded to the remote UE.
  • the Remote UE initiates procedures such as RRC connection establishment, re-establishment, and recovery to the network, it can check the access control.
  • the Remote UE can obtain the system information of the cell through the relay UE.
  • the Relay UE can carry cell information in the discovery message.
  • the selection or reselection of the relay can be triggered according to various reasons such as the PC5 link measurement result, or the upper layer instruction, or the relay UE instruction.
  • the remote UE happens to be running during T390, if the cell of the re-selected relay UE is different from the cell of the previously connected relay UE, if the remote UE still follows the restrictions of T390, it will not be able to initiate access to the network in time. business quality.
  • the access when the sidelink remote UE selects or reselects the sidelink relay UE, the access can be initiated to the network in time, the time delay can be reduced, and the service quality can be guaranteed.
  • FIG. 1 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 1 of the present invention.
  • This embodiment includes steps 101, 103, 105 and 107.
  • the sidelink remote UE receives a discovery message (discovery message) sent by the sidelink relay UE, and saves the first cell identifier carried in the message.
  • the sidelink remote UE uses the first cell identity as the current cell identity.
  • the "cell" in the first cell identifier may be the cell where the sidelink relay UE resides (campon), or the serving cell (serving cell) of the sidelink relay UE.
  • the first cell identity may be in one of the following forms: PCI, CGI, NCI (ie, CellIdentity).
  • the sidelink remote UE receives a system message (SIB).
  • SIB system message
  • the received system message is directly broadcast by the network; or optionally, the received system message is forwarded by sidelink relay UE, and the system message forwarded by sidelink relay UE may be broadcast, multicast or unicast.
  • step 105 the sidelink remote UE in the RRC_IDLE state initiates an RRC connection establishment procedure with the network, and executes a unified access control procedure (unified access control procedure).
  • a unified access control procedure unified access control procedure
  • an access barring check access barring check
  • the timer T1 is started, and the process ends (that is, no RRC connection establishment request message is sent to the network).
  • the T1 timer may be for each access type (Access Category).
  • step 107 during the operation of T1 or if T1 is running, if the first condition is satisfied, the sidelink remote UE stops T1 and performs barring alleviation.
  • the first condition includes one or more of the following:
  • the first condition modification 1 is: if the sidelink relay UE selection or re-selection occurs (optionally, if the selection or re-selection occurs a suitable/candidate sidelink relay UE).
  • the second modification of the first condition is to include one or more of the following:
  • the sidelink remote UE stops T1 for all access categories.
  • step 107 is performed, otherwise it is not performed.
  • T1 can be a T390 timer, or a timer used to control the sidelink remote UE to perform access control (its function is the same as that of T390, but the value range can be different).
  • T1 in the following embodiments all conform to the description here, and will not be repeated here.
  • remote UE triggering relay selection or reselection includes but is not limited to the following scenarios (scenarios that trigger relay UE selection or reselection in the following embodiments are the same here, and will not be repeated here):
  • FIG. 2 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 2 of the present invention.
  • This embodiment includes steps 201 , 203 , 205 and 207 .
  • step 201 is the same as step 101
  • step 203 is the same as step 103 .
  • step 205 the sidelink remote UE in the RRC_INACTIVE state initiates an RRC connection recovery (resume) procedure between the sidelink and the network, and executes a unified access control procedure (unified access control procedure).
  • an access barring check (access barring check) is performed according to the system message obtained in step 203. If the access attempt is barred (access attempt is barred), the timer T1 is started, and the process ends (that is, the RRC connection recovery request message is not sent to the network).
  • the T1 timer may be for each access type (Access Category).
  • Step 207 is the same as step 107 .
  • FIG. 3 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 3 of the present invention.
  • This embodiment includes 301, 303, 305 and 307.
  • step 301 is the same as step 101
  • step 303 is the same as step 103 .
  • step 305 the sidelink remote UE in the RRC_CONNECTED state initiates an RRC connection re-establishment process with the network, and starts T311.
  • step 307 during the running of T311 or if T311 is running, if T1 is running or T1 is running, if the first condition is satisfied, the sidelink remoteUE stops T1 and performs barring alleviation.
  • the scenarios and forms of the first conditional variant 1 and the first conditional variant 2 are as described in Embodiment 1.
  • the sidelink remote UE stops T1 for all access categories.
  • step 307 is performed, otherwise it is not performed.
  • FIG. 4 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 4 of the present invention.
  • This embodiment includes 401, 403, 405 and 407.
  • step 401 is the same as step 101
  • step 403 is the same as step 103 .
  • step 405 the sidelink remote UE in the RRC_IDLE state initiates an RRC connection establishment procedure with the network, and starts the T300 or T302 timer.
  • step 407 during the operation of T300/T302 or if T300/T302 is running, when the first condition is satisfied, the sidelink remote UE performs the action of entering the RRC_IDLE state (the actions upon going to RRC_IDLE), and may Will carry the release reason value (for example: RRC connection failure).
  • the sidelink remote UE performs the action of entering the RRC_IDLE state (the actions upon going to RRC_IDLE), and may Will carry the release reason value (for example: RRC connection failure).
  • step 407 is performed, otherwise it is not performed.
  • FIG. 5 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 5 of the present invention.
  • This example includes 501, 503, 505 and 507.
  • step 501 is the same as step 101
  • step 503 is the same as step 103 .
  • step 505 the sidelink remote UE in the RRC_INACTIVE state initiates an RRC connection recovery procedure with the network, and starts the T319 or T302 timer.
  • step 507 during the operation of T319/T302 or if T319/T302 is running, when the first condition is satisfied, the sidelink remote UE performs the action of entering the RRC_IDLE state (the actions upon going to RRC_IDLE), and may Will carry the release reason value (for example: RRC connection failure).
  • the sidelink remote UE performs the action of entering the RRC_IDLE state (the actions upon going to RRC_IDLE), and may Will carry the release reason value (for example: RRC connection failure).
  • step 507 is performed, otherwise it is not performed.
  • FIG. 6 is a flowchart of a method performed by a sideline communication remote user equipment according to Embodiment 6 of the present invention.
  • This embodiment includes 601, 603, 605 and 607.
  • step 601 is the same as step 101
  • step 603 is the same as step 103 .
  • step 605 the sidelink remote UE in the RRC_CONNECTED state initiates the RRC connection re-establishment procedure with the network, and starts the T311 timer.
  • step 607 during the operation of T311 or if T311 is running, when the first condition is met, the sidelink remote UE stops T311.
  • step 607 is performed, otherwise it is not performed.
  • FIG. 7 is a schematic structural block diagram of the user equipment UE involved in the present invention.
  • the user equipment UE700 includes a processor 701 and a memory 702.
  • the processor 701 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like.
  • the memory 702 may include, for example, volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory, or the like.
  • Memory 702 has program instructions stored thereon. When the instruction is executed by the processor 701, the above method described in detail in the present invention and executed by the user equipment can be executed.
  • a program running on a device may be a program that causes a computer to implement 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 volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory systems.
  • a program for realizing the functions of the embodiments of the present invention can be recorded on a computer-readable recording medium.
  • the corresponding functions can be realized by causing a computer system to read programs recorded on the recording medium and execute the programs.
  • the so-called "computer system” as used herein may be a computer system embedded in the device, and may include an operating system or hardware (eg, 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 dynamically stores a program for a short period of time, or any other recording medium readable by a computer.
  • circuits eg, monolithic or multi-chip integrated circuits.
  • Circuits designed to perform the functions described in this specification may include general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above.
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • a general-purpose processor may be a microprocessor or any existing processor, controller, microcontroller, or state machine.
  • the above circuit may be a digital circuit or an analog circuit. Where new integrated circuit technologies have emerged as a result of advances in semiconductor technology to replace existing integrated circuits, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.
  • the present invention is not limited to the above-described embodiments. Although various examples of the described embodiments have been described, the invention is not limited thereto.
  • Fixed or non-mobile electronic equipment installed indoors or outdoors can be used as terminal equipment or communication equipment, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

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Abstract

本发明提供一种由侧行通信远端UE执行的方法及用户设备。所述方法包括：处于覆盖范围外的所述侧行通信远端UE接收侧行通信中继UE发送的发现消息，并保存所述发现消息中携带的第一小区标识为当前小区标识；接收侧行通信中继UE转发的系统消息；发起RRC连接建立，执行接入控制流程，当接入被禁止，启动第一定时器；以及在第一定时器运行期间，如果满足第一条件，则：停止第一定时器，执行解除禁止。

Description

由侧行通信远端UE执行的方法及用户设备 技术领域
本发明涉及无线通信技术领域，更具体地，本发明涉及由用户设备执行侧行通信中继选择重选的方法以及相应的用户设备。
背景技术
2018年6月，在第三代合作伙伴计划(3rd Generation Partnership Project：3GPP)RAN#80全会上，版本16基于5G NR网络技术的V2X可行性研究课题(参见非专利文献：RP-181480，New SID Proposal：Study on NR V2X)获得批准。版本16的NR V2X包含的主要功能为支持无网络覆盖和有网络覆盖场景下的单播、组播和广播。
2019年12月，RAN#86次全会上，针对版本17的NR sidelink relaying(侧行通信中继)的研究项目被提出(参见非专利文献：RP-193253 New Study Item on NR Sidelink Relaying)，并获批准。该研究项目的最新版本参见非专利文献：RP-201474 reivsed SID NR sidelink relay。该研究项目主要研究UE(用户设备)到网络和UE到UE的中继解决方案，用于扩展基于侧行通信的覆盖。该研究项目的目标之一是支持侧行通信中继的选择和重选。
2020年3月，RAN#91次全会上，针对版本17的NR sidelink relaying(侧行通信中继)的工作项目被提出(参见非专利文献：RP-210904 New Study Item on NR Sidelink Relaying)，并获批准。该工作项目的目标之一是标准化侧行通信中继的选择和重选。
远端UE(remote UE)为了和基站或者另一个远端UE进行侧行通信，可能需要选择一个中继UE(relay UE)为它提供中继服务。当remote UE选择了一个中继UE为自己服务，它可能会因为各种情况进行中继的重选。
本发明讨论remote UE在选择和重选场景中的处理。
发明内容
为了解决上述问题中的至少一部分，本发明提供了一种由侧行通信远端用户设备执行的方法以及用户设备，能够在选择或者重选sidelink  relay UE时，及时向网络发起接入尝试，减少时延，保证业务质量。
根据本发明，提出一种由侧行通信远端UE执行的方法，包括：处于覆盖范围外的所述侧行通信远端UE接收侧行通信中继UE发送的发现消息，并保存所述发现消息中携带的第一小区标识为当前小区标识；接收侧行通信中继UE转发的系统消息；发起RRC连接建立，执行接入控制流程，当接入被禁止，启动第一定时器；以及在第一定时器运行期间，如果满足第一条件，则：停止第一定时器，执行解除禁止。
可选地，第一小区标识包含以下至少一种形式：物理小区标识；全球小区标识；以及NR小区标识。
可选地，第一条件包含以下至少一个：发生了侧行通信中继UE的选择或重选；以及选择或者重选到的侧行通信中继UE的小区标识和所述当前小区不同。
可选地，第一定时器包含以下至少一个：T390；以及用于控制所述侧行通信远端UE进行接入控制的定时器。
可选地，如果所述侧行通信中继UE在发现消息中不携带小区标识，在第一定时器运行期间，如果发生了侧行通信中继UE的选择或重选，则：停止第一定时器，执行解除禁止。
根据本发明，提出另一种由侧行通信远端UE执行的方法，包括：处于RRC_IDLE态的侧行通信远端UE发起RRC连接建立，启动T300或T302定时器；以及在T300或T302运行期间，如果满足第一条件，则：所述侧行通信远端UE执行进入RRC_IDLE态的动作，通知RRC连接释放原因给上层。
根据本发明，提出又一种由侧行通信远端UE执行的方法，包括：处于RRC_INACTIVE态的侧行通信远端UE发起RRC连接恢复，启动T319或T302定时器；以及在T319或T302运行期间，如果满足第一条件，则：所述侧行通信远端UE执行进入RRC_IDLE态的动作，通知RRC连接释放原因给上层。
根据本发明，提出再一种由侧行通信远端UE执行的方法，包括：处于RRC_CONNECTED态的侧行通信远端UE发起RRC连接重建，启动T311定时器；以及在T311运行期间，如果满足第一条件，则：所述侧行通信远端UE停止T311。
另外，根据本发明，提出一种用户设备，包括：处理器；以及存储器，存储有指令；其中，所述指令在由所述处理器运行时执行根据权利要求1至8中的任一项所述的方法。
附图说明
图1是根据本发明的实施例1的由侧行通信远端用户设备执行的方法的流程图。
图2是根据本发明的实施例2的由侧行通信远端用户设备执行的方法的流程图。
图3是根据本发明的实施例3的由侧行通信远端用户设备执行的方法的流程图。
图4是根据本发明的实施例4的由侧行通信远端用户设备执行的方法的流程图。
图5是根据本发明的实施例5的由侧行通信远端用户设备执行的方法的流程图。
图6是根据本发明的实施例6的由侧行通信远端用户设备执行的方法的流程图。
图7是本发明涉及的用户设备UE的简要结构框图。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细阐述。应当注意，本发明不应局限于下文所述的具体实施方式。另外，为了简便起见，省略了对与本发明没有直接关联的公知技术的详细描述，以防止对本发明的理解造成混淆。
下面描述本发明涉及的部分术语，术语的具体含义见3GPP最新标准规范，例如TS38.300、TS38.331、TS36.300、TS36.331等。除非另有指出，本发明中涉及的术语都具有下文的含义。
UE：User Equipment用户设备
NR：New Radio新一代无线技术
RRC：Radio Resource Control无线资源控制
RRC_CONNECTED：RRC连接态
RRC_INACTIVE：RRC非激活态
RRC_IDLE：RRC空闲态
RAN：Radio Access Network，无线接入层
Sidelink：侧行通信
SCI：Sidelink Control Information，侧行通信控制信息
AS：Access Stratum，接入层
IE：Information Element，信息元素
CE：Control Element，控制元素
MIB：Master Information Block，主信息块
NR：New Radio，新无线电
SIB：System Information Block，系统信息块
NG-RAN：NG Radio Access Network，新一代无线接入网络
PLMN：Public Land Mobile Network，公共陆地移动网
PCI：Physical Cell Identifier，物理小区标识
CGI：Cell Global Identifier，全球小区标识
NCI：NR Cell Identity，NR小区身份
MAC：Medium Access Control，介质访问控制
DCI：Downlink Control Information，下行控制信息
本发明中，网络、基站和RAN可互换使用，所述网络可以是长期演进LTE网络、新无线访问技术(New RAT，NR)网络、增强的长期演进eLTE网络，也可以是3GPP后续演进版本中定义的其他网络。
本发明中，用户设备UE可以指背景技术中所述的支持NR Sidelink中继功能的NR设备，也可以指其他类型的NR设备或者LTE设备。
以下，对本发明的相关技术给出说明。
NCGI用于在全球范围内标识一个NR小区。NCGI是由PLMN ID和NCI构成的。NCI由系统消息中的CellIdentity这个信元指示。
在NR中，当UE根据网络广播的系统消息发现自己的接入类型是被禁止的，根据系统消息中的信息计算出禁止接入的时间，启动T390定时器，并在该定时器运行期间不再向发起网络的接入。当UE发送RRCSetupRequest消息后，启动T300定时器。当UE在发起RRC连接建立 或者恢复时收到RRCReject消息，根据该消息中的waitTime信元启动T302定时器。当UE发起RRC连接重建流程，启动T311定时器。当UE发送RRCResumeRequest或者RRCResumeRequest1消息，启动T319定时器。
PC5接口是UE和UE之间进行控制面和用户面Sidelink通信的接口。对于Sidelink单播，PC5-RRC连接是一对源层二ID和目标层二ID之间的AS层逻辑连接。一个PC5单播链路建立就会对应有一个PC5-RRC连接建立。
[根据细则91更正 16.06.2022]　
图8是表示UE-to-Network中继的场景1~场景3的示意图，图8的（a）表示远端UE在覆盖范围外的场景1，图8的（b）表示远端UE在覆盖范围内的场景2，图8的（c）表示远端UE和中继UE在不同小区的场景3。如图8所示，场景1和场景2中，左侧为远端UE，中间为中继UE，右侧为网络；场景3中，两侧为网络，中间从左到右分别为远端UE和中继UE。远端UE和中继UE之间通过PC5接口连接，中继UE和网络通过Uu口连接。由于远端UE距离网络较远或者通信环境不佳，需要中继UE对两者间的信令和数据进行中继转发。
[根据细则91更正 16.06.2022]　
UE-to-Network中继的场景包含：
1)Remote UE在覆盖范围外，Relay UE在覆盖范围内；
2)Remote UE和Relay UE都在覆盖范围内，并且在同一个小区；
3)Remote UE和Relay UE都在覆盖范围内，但在不同小区。
[根据细则91更正 16.06.2022]　
图9是表示UE-to-UE中继的示意图。如图9所示，左右两侧为远端UE，中间为中继UE。远 端UE和中继UE之间分别通过PC5接口连接。由于两个远端UE距离较远或者通信环境不佳，需要中继UE对两者间的信令和数据进行中继转发。
[根据细则91更正 16.06.2022]　
UE-to-UE中继的场景包含：
1)覆盖范围内：两个远端UE(即源侧UE和目标侧UE)和中继UE都在覆盖范围内；
2)覆盖范围外：两个远端UE(即源侧UE和目标侧UE)和中继UE都在覆盖范围外；
3)部分覆盖：两个远端UE和中继UE中，至少有一个UE在覆盖范围内，并且至少有一个UE在覆盖范围外。
Remote UE选定了一个relay UE为自己提供中继服务后，会和relay UE建立PC5-RRC连接，以便通过relay UE和网络进行通信。对于侧行通信层二中继架构，Remote UE可以通过relay UE和网络建立空口RRC连接用于remote UE和网络间的数据传输。Remote UE将向网络进行RRC连接建立、重建、恢复等消息封装在PC5消息中发送给relay UE，relay UE收到后转发给网络。反过来，网络回复的RRC消息由relay UE将其封装在PC5消息中转发给remote UE。Remote UE在向网络发起RRC连接建立、重建、恢复等流程时，可以进行接入控制的检查。
Remote UE可以通过relay UE获取到小区的系统消息。Relay UE可以在发现消息中携带小区信息。Remote UE和relay UE建立PC5连接后，可以根据PC5链路测量结果，或者上层指示，或者relay UE指示等各种原因触发relay的选择或者重选。此时，如果remote UE刚好处在T390运行期间，如果重新选择的relay UE的小区和之前连接的relay UE的小区不同，remote UE如果仍然按照T390的限制，则无法及时向网络发起接入，影响业务质量。
通过本发明，可以在sidelink remote UE选择或者重选sidelink relay UE时，及时向网络发起接入，减少时延，保证业务质量。
以下，详细描述本发明对于上述问题的若干实施例。
实施例1
图1是根据本发明的实施例1的由侧行通信远端用户设备执行的方法的流程图。
本实施例包含步骤101，103，105和107。
可选地，在步骤101中，sidelink remote UE接收sidelink relay UE发送的发现消息(discovery message)，并保存该消息中携带的第一小区标识。可选地，sidelink remote UE将第一小区标识作为当前的小区标识。
其中，第一小区标识中的“小区”可能为sidelink relay UE所驻留(campon)小区，或者为sidelink relay UE的服务小区(serving cell)。第一小区标识可以为如下的一种形式：PCI，CGI，NCI(即CellIdentity)。
可选地，在步骤103中，sidelink remote UE接收系统消息(SIB)。
其中，可选地，接收到系统消息是网络直接广播的；或者可选地，接收的系统消息是sidelink relay UE转发的，sidelink relay UE转发系统消息可以通过广播、组播或者单播的方式。
可选地，在步骤105中，处于RRC_IDLE态的sidelink remote UE发起和网络之间的RRC连接建立流程，执行统一的接入控制流程(unified access control procedure)。在接入控制流程中，根据在步骤101中获取的系统消息进行接入禁止校验(access barring check)。如果接入尝试被禁止(access attempt is barred)，启动定时器T1，流程结束(即不向网络发送RRC连接建立请求消息)。其中T1定时器可以是针对每一种接入类型(Access Category)。
可选地，在步骤107中，在T1运行期间或如果T1正在运行，如果满足第一条件，则sidelink remote UE停止T1，执行解除禁止(barring alleviation)。
其中第一条件包含如下的一条或者多条：
1)如果发生了sidelink relay UE选择或重选(可选地，如果选择或者重选到了一个合适的/候选的sidelink relay UE)
2)如果选择或者重选到的sidelink relay UE的第二小区标识和第一小区标识不同(或者和当前的小区标识不同)。
如果所述步骤101中，sidelink relay UE在发现消息中没有携带第一小区标识，则第一条件变形一为：如果发生了sidelink relay UE选择或重选(可选地，如果选择或者重选到了一个合适的/候选的sidelink relay UE)。
如果选择或者重选到的sidelink relay UE没有携带小区标识，则第一条件变形二为包含如下的一条或者多条：
1)如果发生了sidelink relay UE选择或重选(可选地，如果选择或者重选到了一个合适的/候选的sidelink relay UE)
2)如果选择或者重选到的sidelink relay UE没有在发现消息中携带小区标识。
其中，可选地，sidelink remote UE为所有接入类型(access category)停止T1。可选地，如果sidelink remote UE在覆盖范围外(out of coverage)场景，执行步骤107，否则不执行。
其中，T1可以是T390定时器，也可以是用于控制sidelink remote UE进行接入控制的定时器(其作用和T390相同，但是取值范围可以不同)。后面的实施例中的T1均符合此处描述，不再赘述。
其中，remote UE触发relay选择或者重选包括但不限于如下场景(后面的实施例中触发relay UE选择或者重选的场景于此相同，不再赘述)：
1)通过检测PC5-RRC链路质量低于某个门限值；
2)通过检测relay UE发送的发现消息的质量低于某个门限值；
3)收到上层的触发指示；
4)收到relay UE的触发指示，该指示可能包含在PC5-RRC消息中或者PC5-S消息中；
5)收到网络的触发指示，该指示可能包含在RRC消息中、或者MAC CE中、或者物理层DCI中。
实施例2
图2是根据本发明的实施例2的由侧行通信远端用户设备执行的方法的流程图。
本实施例包含步骤201，203，205和207。
可选地，步骤201同步骤101，步骤203同步骤103。
可选地，步骤205中，处于RRC_INACTIVE态的sidelink remote UE 发起和网络之间的RRC连接恢复(resume)流程，执行统一的接入控制流程(unified access control procedure)。在接入控制流程中，根据在步骤203中获取的系统消息进行接入禁止校验(access barring check)。如果接入尝试被禁止(access attempt is barred)，启动定时器T1，流程结束(即不向网络发送RRC连接恢复请求消息)。其中T1定时器可以是针对每一种接入类型(Access Category)。
步骤207同步骤107。
实施例3
图3是根据本发明的实施例3的由侧行通信远端用户设备执行的方法的流程图。
本实施例包含301，303，305和307。
可选地，步骤301同步骤101，步骤303同步骤103。
可选地，在步骤305中，处于RRC_CONNECTED态的sidelink remote UE发起和网络之间的RRC连接重建流程，启动T311。
可选地，在步骤307中，在T311运行期间或如果T311正在运行，如果T1在运行期间或者T1正在运行，如果满足第一条件，则sidelink remoteUE停止T1，执行解除禁止(barring alleviation)。第一条件变形一和第一条件变形二的场景和形式如实施例1所述。
其中，可选地，sidelink remote UE为所有接入类型(access category)停止T1。可选地，如果sidelink remote UE在覆盖范围外(out of coverage)场景，执行步骤307，否则不执行。
实施例4
图4是根据本发明的实施例4的由侧行通信远端用户设备执行的方法的流程图。
本实施例包含401，403，405和407。
可选地，步骤401同步骤101，步骤403同步骤103。
可选地，在步骤405中，处于RRC_IDLE态的sidelink remote UE发起和网络之间的RRC连接建立流程，启动T300或T302定时器。
可选地，在步骤407中，在T300/T302运行期间或如果T300/T302正在运行，当满足第一条件，则sidelink remote UE执行进入RRC_IDLE态的 动作(the actions upon going to RRC_IDLE)，同时可能会携带释放原因值(例如：RRC连接失败)。
其中，可选地，如果sidelink remote UE在覆盖范围外(out of coverage)场景，执行步骤407，否则不执行。
实施例5
图5是根据本发明的实施例5的由侧行通信远端用户设备执行的方法的流程图。
本实施例包含501，503，505和507。
可选地，步骤501同步骤101，步骤503同步骤103。
可选地，在步骤505中，处于RRC_INACTIVE态的sidelink remote UE发起和网络之间的RRC连接恢复流程，启动T319或T302定时器。
可选地，在步骤507中，在T319/T302运行期间或如果T319/T302正在运行，当满足第一条件，则sidelink remote UE执行进入RRC_IDLE态的动作(the actions upon going to RRC_IDLE)，同时可能会携带释放原因值(例如：RRC连接失败)。
其中，可选地，如果sidelink remote UE在覆盖范围外(out of coverage)场景，执行步骤507，否则不执行。
实施例6
图6是根据本发明的实施例6的由侧行通信远端用户设备执行的方法的流程图。
本实施例包含601，603，605和607。
可选地，步骤601同步骤101，步骤603同步骤103。
可选地，在步骤605中，处于RRC_CONNECTED态的sidelink remote UE发起和网络之间的RRC连接重建流程，启动T311定时器。
可选地，在步骤607中，在T311运行期间或如果T311正在运行，当满足第一条件，sidelink remote UE停止T311。
其中，可选地，如果sidelink remote UE在覆盖范围外(out of coverage)场景，执行步骤607，否则不执行。
图7是本发明涉及的用户设备UE的简要结构框图。如图7所示，该用 户设备UE700包括处理器701和存储器702。处理器701例如可以包括微处理器、微控制器、嵌入式处理器等。存储器702例如可以包括易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器等。存储器702上存储有程序指令。该指令在由处理器701运行时，可以执行本发明详细描述的由用户设备执行的上述方法。
运行在根据本发明的设备上的程序可以是通过控制中央处理单元(CPU)来使计算机实现本发明的实施例功能的程序。该程序或由该程序处理的信息可以临时存储在易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统中。
用于实现本发明各实施例功能的程序可以记录在计算机可读记录介质上。可以通过使计算机系统读取记录在所述记录介质上的程序并执行这些程序来实现相应的功能。此处的所谓“计算机系统”可以是嵌入在该设备中的计算机系统，可以包括操作系统或硬件(如外围设备)。“计算机可读记录介质”可以是半导体记录介质、光学记录介质、磁性记录介质、短时动态存储程序的记录介质、或计算机可读的任何其他记录介质。
用在上述实施例中的设备的各种特征或功能模块可以通过电路(例如，单片或多片集成电路)来实现或执行。设计用于执行本说明书所描述的功能的电路可以包括通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、或其他可编程逻辑器件、分立的门或晶体管逻辑、分立的硬件组件、或上述器件的任意组合。通用处理器可以是微处理器，也可以是任何现有的处理器、控制器、微控制器、或状态机。上述电路可以是数字电路，也可以是模拟电路。因半导体技术的进步而出现了替代现有集成电路的新的集成电路技术的情况下，本发明的一个或多个实施例也可以使用这些新的集成电路技术来实现。
此外，本发明并不局限于上述实施例。尽管已经描述了所述实施例的各种示例，但本发明并不局限于此。安装在室内或室外的固定或非移动电子设备可以用作终端设备或通信设备，如AV设备、厨房设备、清洁设备、空调、办公设备、自动贩售机、以及其他家用电器等。
如上，已经参考附图对本发明的实施例进行了详细描述。但是，具体 的结构并不局限于上述实施例，本发明也包括不偏离本发明主旨的任何设计改动。另外，可以在权利要求的范围内对本发明进行多种改动，通过适当地组合不同实施例所公开的技术手段所得到的实施例也包含在本发明的技术范围内。此外，上述实施例中所描述的具有相同效果的组件可以相互替代。

Claims (9)

  1. 一种由侧行通信远端UE执行的方法，包括：
    处于覆盖范围外的所述侧行通信远端UE接收侧行通信中继UE发送的发现消息，并保存所述发现消息中携带的第一小区标识为当前小区标识；
    接收侧行通信中继UE转发的系统消息；
    发起RRC连接建立，执行接入控制流程，当接入被禁止，启动第一定时器；以及
    在第一定时器运行期间，如果满足第一条件，则：停止第一定时器，执行解除禁止。
  2. 根据权利要求1所述的方法，其中，
    第一小区标识包含以下至少一种形式：
    物理小区标识；
    全球小区标识；以及
    NR小区标识。
  3. 根据权利要求1所述的方法，其中，
    第一条件包含以下至少一个：
    发生了侧行通信中继UE的选择或重选；以及
    选择或者重选到的侧行通信中继UE的小区标识和所述当前小区不同。
  4. 根据权利要求1所述的方法，其中，
    第一定时器包含以下至少一个：
    T390；以及
    用于控制所述侧行通信远端UE进行接入控制的定时器。
  5. 根据权利要求1-4中任一项所述的方法，还包括：
    如果所述侧行通信中继UE在发现消息中不携带小区标识，在第一定时器运行期间，如果发生了侧行通信中继UE的选择或重选，则：停止第一定时器，执行解除禁止。
  6. 一种由侧行通信远端UE执行的方法，包括：
    处于RRC_IDLE态的侧行通信远端UE发起RRC连接建立，启动T300或T302定时器；以及
    在T300或T302运行期间，如果满足第一条件，则：所述侧行通信远端UE执行进入RRC_IDLE态的动作，通知RRC连接释放原因给上层。
  7. 一种由侧行通信远端UE执行的方法，包括：
    处于RRC_INACTIVE态的侧行通信远端UE发起RRC连接恢复，启动T319或T302定时器；以及
    在T319或T302运行期间，如果满足第一条件，则：所述侧行通信远端UE执行进入RRC_IDLE态的动作，通知RRC连接释放原因给上层。
  8. 一种由侧行通信远端UE执行的方法，包括：
    处于RRC_CONNECTED态的侧行通信远端UE发起RRC连接重建，启动T311定时器；以及
    在T311运行期间，如果满足第一条件，则：所述侧行通信远端UE停止T311。
  9. 一种用户设备，包括：
    处理器；以及
    存储器，存储有指令；
    其中，所述指令在由所述处理器运行时执行根据权利要求1至8中的任一项所述的方法。
PCT/CN2022/089211 2021-04-30 2022-04-26 由侧行通信远端ue执行的方法及用户设备 WO2022228419A1 (zh)

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