WO2023103950A1 - 由用户设备执行的方法以及用户设备 - Google Patents

由用户设备执行的方法以及用户设备 Download PDF

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Publication number
WO2023103950A1
WO2023103950A1 PCT/CN2022/136535 CN2022136535W WO2023103950A1 WO 2023103950 A1 WO2023103950 A1 WO 2023103950A1 CN 2022136535 W CN2022136535 W CN 2022136535W WO 2023103950 A1 WO2023103950 A1 WO 2023103950A1
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Prior art keywords
relay
rrc
selection
remote
performs
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PCT/CN2022/136535
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English (en)
French (fr)
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刘蕾
张崇铭
刘仁茂
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夏普株式会社
刘蕾
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Publication of WO2023103950A1 publication Critical patent/WO2023103950A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30Services specially adapted for particular environments, situations or purposes
    • H04W4/40Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/18Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W40/00Communication routing or communication path finding
    • H04W40/02Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22Communication 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/19Connection re-establishment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/20Manipulation of established connections
    • H04W76/27Transitions between radio resource control [RRC] states
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • H04W88/04Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • version 16 was based on the V2X feasibility research topic of 5G NR network technology (see non-patent literature: RP-181480, New SID Proposal: Study on NR V2X) was approved.
  • the main functions included in version 16 of NR V2X are to support unicast, multicast and broadcast in scenarios with and without network coverage.
  • the method performed by a user equipment UE includes: the UE receiving an RRC release message sent by the network; when the RRC release message contains a suspend configuration information element, the UE Perform the following first action: if the UE is a remote UE, then the UE enters the RRC inactive state, performs cell selection or relay selection, or performs cell selection and relay selection.
  • the UE performs the following second action: if the UE is a remote UE, the The UE enters the RRC idle state, performs cell selection or relay selection, or performs cell selection and relay selection.
  • the UE executes the second action only when the RRC release message does not contain the suspendConfig information element and does not meet any of the following conditions, condition 1 : Entering the RRC idle state is triggered by inter-RAT cell reselection between different standards; Condition 2: Select an inter-RAT cell during the running of the T311 timer; Condition 3: Fallback for EPS fallback for IMS voice Select an E-UTRA cell.
  • the UE is configured by an upper layer to need to search for a relay UE, and the method includes: when the UE is out of coverage, or the UE is camped If the reference signal received power RSRP measurement value of the remaining cell is lower than a certain threshold value, the UE performs the following actions: if the UE does not have a selected relay UE, or the UE has a selected relay UE The relay UE and the sidelink communication reference signal received power SU-RSRP or the sidelink communication discovery message reference signal received power SD-RSRP measurement value of the currently selected relay UE is lower than a certain threshold value, or the UE has The selected relay UE and the PC5-RRC connection between the current Relay UE detects that the sidelink communication radio link fails, then evaluate the detected relay UE according to the SD-RSRP measurement result and select from it A candidate relay UE, the SD-RSRP of the selected candidate relay UE exceeds the certain threshold.
  • the UE is a remote UE, and the UE sends an RRC reestablishment request RRCReestablishmentRequest message to the network through the relay UE, and starts a timer;
  • the UE performs the following actions: the UE enters the RRC idle state, performs cell selection or relay selection, or performs cell selection And relay selection relay selection.
  • the one timer is a T301 timer.
  • the user equipment includes: a processor; and a memory storing instructions; wherein, when the instructions are executed by the processor, the instructions according to the first aspect, the second aspect, Any of the methods of the third aspect.
  • FIG. 1 is a schematic diagram illustrating UE-to-UE relay.
  • Fig. 2(a), Fig. 2(b) and Fig. 2(c) are schematic diagrams respectively showing scenarios 1, 2 and 3 of UE-to-Network relay.
  • Fig. 3 is a schematic diagram showing the basic process of the method executed by the user equipment in Embodiment 1 of the invention.
  • Fig. 4 is a schematic diagram showing the basic process of the method executed by the user equipment in Embodiment 2 of the invention.
  • Fig. 5 is a schematic diagram showing the basic process of the method executed by the user equipment in Embodiment 3 of the invention.
  • Fig. 6 is a schematic diagram showing the basic process of the method executed by the user equipment in Embodiment 4 of the invention.
  • FIG. 7 is a block diagram illustrating a user equipment according to an embodiment of the present invention.
  • UE User Equipment user equipment
  • MAC CE MAC control element
  • RLC Radio Link Control Wireless Link Control
  • SDAP Service Data Adaptation Protocol Service Data Adaptation Protocol
  • PDCP Packet Data Convergence Protocol Packet Data Convergence Protocol
  • RRC Radio Resource Control Radio Resource Control
  • RRC_IDLE RRC idle state
  • RAN Radio Access Network, wireless access layer
  • SCI Sidelink Control Information, side communication control information
  • MIB Master Information Block, master information block
  • New Radio new radio
  • SIB System Information Block, system information block
  • NG-RAN NG Radio Access Network, a new generation of radio access network
  • DCI Downlink Control Information, downlink control information
  • ADAPT Adaptation layer, side communication adaptation layer
  • PHY physical layer, physical layer
  • RB radio bearer, wireless bearer
  • DRB Data Radio Bearer, data radio bearer
  • SRB Signaling Radio Bearer, signaling radio bearer
  • ProSe Proximity based Services: Proximity service
  • V2X Vehicle-to-Everything
  • NAS Non-Access-Stratum, non-access stratum
  • PC5-S PC5 signaling, PC5 signaling
  • U2N UE-to-Network, UE to Network
  • RSRP Reference Signal Received Power Reference Signal Received Power
  • SL-RSRP sidelink RSRP, sidelink communication reference signal received power
  • SD-RSRP sidelink discovery RSRP, sidelink communication discovery message reference signal received power
  • EPS Evolved Packet System, evolved packet system
  • IMS IP Multimedia Subsystem, IP Multimedia System
  • E-UTRA Evolved Universal Terrestrial Radio Access, Evolved Universal Terrestrial Radio Access
  • the 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 defined in .
  • New RAT new radio access technology
  • eLTE enhanced long-term evolution eLTE network
  • the user equipment UE may refer to the NR equipment supporting the NR Sidelink relay function described in the background technology, or may refer to the NR equipment supporting the NR sidelink relay architecture, or may refer to other types of NR equipment or LTE equipment.
  • Remote UE can refer to a UE connected to the network through a U2N relay UE, or a UE capable of executing NR sidelink U2N Remote UE.
  • the Relay UE can refer to the UE that supports the connection to the network for the Remote UE, and can also refer to the UE that has this capability.
  • "Relay UE" and "NR sidelink U2N Relay UE” can be used interchangeably.
  • sidelink and PC5 can be used interchangeably.
  • “Feedback”, “report”, “escalation”, “send”, “notification” are used interchangeably.
  • Endable”, “adopt”, “apply”, “enable”, “activate”, “implement” and the like are used interchangeably.
  • relay selection can only refer to that the Remote UE selects a Relay UE when it is not connected to the base station through the Relay UE, or it can refer to that the Remote UE selects a Relay UE and Remote UE when it is not connected to the base station through the Relay UE.
  • a Relay UE is reselected (that is, Relay reselection).
  • the upper layer may refer to the ProSe layer, or the V2X layer, or the NAS layer, or the PCS-S protocol layer.
  • PC5-S link and PC5 unicast link can be used interchangeably.
  • ProSe layer, V2X layer, NAS layer, and PC5-S protocol layer can be used interchangeably.
  • the PC5 interface is an interface for Sidelink communication between the UE and the UE on the control plane and the user plane.
  • the PC5-RRC connection is an AS layer logical connection between a pair of source layer 2 IDs and target layer 2 IDs.
  • the establishment of a PC5 unicast link corresponds to the establishment of a PC5-RRC connection.
  • UE-to-UE relay is shown in Figure 1, the left and right sides are remote UEs, and the middle is a relay UE.
  • the remote UE and the relay UE are respectively connected through the PC5 interface. Since the two remote UEs are far away or the communication environment is not good, the relay UE needs to relay and forward the signaling and data between the two remote UEs.
  • Scenarios for UE-to-UE relay include:
  • two remote UEs ie, the source UE and the target UE
  • the relay UE are within the coverage
  • Partial coverage among the two remote UEs and the relay UE, at least one UE is within the coverage area, and at least one UE is outside the coverage area.
  • UE-to-Network relay is shown in Figure 2(a), (b), and (c).
  • the far-end UE is on the left
  • the middle is the relay UE
  • the network is on the right
  • the two sides are the networks (for example, networks A and B)
  • the middle is the remote UE and the relay UE respectively from left to right.
  • the remote UE is connected to the relay UE through the PC5 interface
  • the relay UE is connected to the network through the Uu interface. Since the remote UE is far away from the network or the communication environment is not good, the relay UE needs to relay and forward the signaling and data between the two.
  • Both the Remote UE and the Relay UE are within the coverage area and are in the same cell;
  • Both the Remote UE and the Relay UE are within coverage, but in different cells (for example, cells A', B').
  • the reference point between the UE and the radio access network is called Uu, so the connection between the UE and the radio access network is called a Uu connection.
  • Uu connection according to the state of the Uu RRC connection, the state of the UE can be divided into an idle state (RRC_IDLE state), an inactive state (RRC_INACTIVE state), and a connected state (RRC_CONNECTED state). After the RRC connection is established, the UE can be in the RRC_INACTIVE or RRC_CONNECTED state. If no RRC connection is established, the UE is in RRC_IDLE state.
  • the Remote UE can be in the RRC_INACTIVE or RRC_CONNECTED state; if the RRC connection is not established, then the UE is in the RRC_IDLE state.
  • the Relay UE can also be in one of these three states.
  • the Remote UE in the RRC_CONNECTED or RRC_INACTIVE state receives the RRCRelease message carrying suspendConfig (suspend configuration) sent by the network, and enters or returns to the RRC_INACTIVE state.
  • the Remote UE in the RRC_CONNECTED or RRC_INACTIVE state receives the RRCRelease message without suspendConfig sent by the network, and enters the RRC_IDLE state.
  • the Relay UE when the Remote UE is in RRC_CONNECTED, the Relay UE must be in RRC_CONNECTED; when the Remote UE is in RRC_INACTIVE/RRC_IDLE, the Relay UE can be in any of the three states RRC_CONNECTED/RRC_INACTIVE/RRC_IDLE.
  • the application layer triggers the ProSe layer to establish a PC5 unicast link (between the Remote UE and the Relay UE) process.
  • the ProSe layer instructs the AS layer, and the AS layer establishes a PC5-RRC connection according to the requirements of the ProSe layer, so as to communicate with the network through the Relay UE.
  • the NR sidelink L2U2N relay architecture there can be RRC connection establishment, release, reconstruction, recovery and other processes between the Remote UE and the network.
  • 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 message of RRC connection establishment, re-establishment, and recovery 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 the PC5 message by the Relay UE and forwarded to the Remote UE.
  • the Remote UE can obtain the system information of the cell through the Relay UE.
  • the Remote UE can also receive the paging message from the network through the Relay UE.
  • the Remote UE After the Remote UE establishes a connection with the network and enters RRC_CONNECTED, stop relay selection and/or reselection. However, the Remote UE can trigger relay selection and/or relay reselection for various reasons such as PC5 link measurement results, or upper layer indications, or Relay UE indications.
  • the Remote UE When the Remote UE selects or reselects a Relay UE, it may need to receive network-side system messages, or paging messages, or send/receive other RRC-specific signaling, and the application layer does not know such requirements at this time. Therefore, the establishment of PC5 unicast link and PC5-RRC connection cannot be initiated, so that system information and paging cannot be obtained, or RRC proprietary signaling cannot be sent/received.
  • the typical scenario discussed in the present invention is: when the Remote UE enters/returns to RRC_INACTIVE from RRC_CONNECTED or RRC_INACTIVE, and when the Remote UE enters RRC_IDLE from RRC_INACTIVE or RRC_CONNECTED, how does the Remote UE trigger the relay selection process in time; and when a relay selection is selected or reselected After the relay UE, how does the remote UE establish a PC5 unicast link and PC5-RRC connection, thereby reducing delay and ensuring service quality.
  • this embodiment includes steps 101 and 103 .
  • step 101 the UE receives the RRC Release message sent by the network.
  • the RRCRelease message sent by the network is forwarded by the Relay UE.
  • step 103 if the RRCRelease message contains a suspendConfig (suspend configuration) information element, the UE performs the following judgments and actions:
  • the UE If the UE is connected to an L2 U2N Relay UE through a PC5-RRC connection (connection), that is, the UE is a Remote UE, then the UE enters RRC_INACTIVE, executes cell selection or relay selection, or executes cell selection and relay selection.
  • the UE enters RRC_INACTIVE and performs cell selection.
  • the UE performs the following actions:
  • the UE If the UE is connected to an L2 U2N Relay UE through a PC5-RRC connection, that is, the UE is a Remote UE, then the UE enters RRC_IDLE, executes cell selection or relay selection, or executes cell selection and relay selection.
  • the UE enters RRC_IDLE and performs cell selection.
  • a judgment may also be added, and the UE performs the above actions only if any of the following conditions is not satisfied:
  • RRC_IDLE is triggered by inter-RAT (between different standards) cell reselection
  • the UE initiates an RRC connection reestablishment process, sends an RRCReestablishmentRequest message to the network, and starts a T301 timer.
  • T301 stops after the Remote UE receives the RRCReestablishment or RRCSetup message replied by the network.
  • the Remote UE performs the following actions:
  • the UE If the UE is connected to an L2 U2N Relay UE through a PC5-RRC connection, that is, the UE is a Remote UE, then the UE enters RRC_IDLE, executes cell selection or relay selection, or executes cell selection and relay selection.
  • the UE enters RRC_IDLE and performs cell selection.
  • the Remote UE initiates an RRC connection reestablishment process, sends an RRCReestablishmentRequest message to the network through the relay UE, and starts a timer.
  • the timer stops after the Remote UE receives the RRCReestablishment or RRCSetup message replied by the network.
  • step 303 if the timer expires or the selected cell becomes an unsuitable cell, the Remote UE enters RRC_IDLE, performs cell selection or relay selection, or performs cell selection and relay selection.
  • executing cell selection or relay selection refers to executing any one of cell selection and relay selection.
  • Executecute cell selection and relay selection means to execute both cell selection and relay selection.
  • this embodiment includes steps 401 , 403 and 405 .
  • step 401 the UE configured by the upper layer to search for the Relay UE, if the UE is out of coverage, or if the RSRP measurement value of the cell where the UE resides is lower than a certain threshold value, then Perform the following judgments and operations:
  • the UE does not have a selected Relay UE, or if the UE has a selected Relay UE and the SL-RSRP or SD-RSRP measurement value of the currently selected Relay UE is lower than a certain threshold, or if the selected If the above UE has a selected Relay UE and the PC5-RRC connection with the current Relay UE detects a sidelink radio link failure, then evaluate the detected Relay UE according to the SD-RSRP measurement result and select a candidate Relay UE from it, The SD-RSRP of the selected candidate Relay UE exceeds a certain threshold.
  • the UE may perform any one of the following operations:
  • the threshold value may be a different parameter configured by the network, or may be a pre-configured parameter, and the values of the parameters may be the same or different.
  • the upper layer receives the relay selection or reselection indication indicated by the AS layer, or receives the selected candidate Relay UE indicated by the AS layer, or receives the PC5-RRC establishment indication indicated by the AS layer, or After receiving the instruction to establish the PC5 unicast link, initiate the process of establishing the PC5 unicast link.
  • step 405 when the Remote UE selects or reselects a Relay UE, the Prose layer of the Remote UE initiates the PC5 unicast link establishment process; otherwise, the Prose layer requires Establish a PC5 unicast link.
  • the L2 U2N Relay UE finally selected or reselected by the Remote UE may be determined by the Prose layer, or by the AS layer (such as the RRC layer).
  • the Remote UE may further determine that only the selected Relay UE is an L2 U2N Relay UE, and initiate a PC5 unicast link establishment process.
  • step 405 another example of step 405 is that the Remote UE receives the discovery (discovery) message of the Relay UE and selects the Relay UE to serve itself, and then initiates a PC5 unicast link establishment process.
  • the Remote UE may further determine that only the selected Relay UE is an L2 U2N Relay UE, and initiate a PC5 unicast link establishment process.
  • Fig. 7 is a brief 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, and the like.
  • the memory 702 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memories.
  • Memory 702 has program instructions stored thereon. When the instructions are executed by the processor 701, the above method described in detail in the present invention and executed by the user equipment may be executed.
  • the program running on the device 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 volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory systems.
  • a program for realizing the functions of the various 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” here may be a computer system embedded in the device, which may include an operating system or hardware (such as peripheral devices).
  • the "computer-readable recording medium” may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium in which a short-term dynamic storage program is stored, or any other recording medium readable by a computer.
  • circuits for example, single-chip 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 can be a microprocessor, or it can be any existing processor, controller, microcontroller, or state machine.
  • the above-mentioned circuits may be digital circuits or analog circuits. Where advances in semiconductor technology have resulted in new integrated circuit technologies that replace existing integrated circuits, one or more embodiments of the 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 embodiments have been described, the present 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

本发明提供了一种由用户设备执行的方法以及用户设备,所述方法包括:所述UE接收网络发送的RRC释放消息;在所述RRC释放消息中包含挂起配置suspendConfig信元的情况下,所述UE执行如下第一动作:若所述UE为远端UE,则所述UE进入RRC非激活态,执行小区选择cell selection或者中继选择relay selection,或者执行小区选择cell selection和中继选择relay selection。

Description

由用户设备执行的方法以及用户设备 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架构中远端UE选择中继UE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 reivised 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。该研究项目的目标包含支持侧行通信控制面流程和中继UE的选择重选。
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。该工作项目的最新版本参见非专利文献:RP-212601 reivised WID NR sidelink relay。该工作项目的目标之一是标准化侧行通信控制面流程,例如RRC连接的管理、***消息的接收和寻呼的接收。该工作项目的目标还包括标准化侧行通信中继UE的选择和重选流程。
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。在UE 到基站的中继架构中Remote UE和基站之间可以建立RRC连接。当Remote UE选择了一个中继UE为自己服务,也可能会因为各种情况进行中继UE的重选。
本发明讨论Remote UE在和基站进行RRC连接流程控制过程中何时发起对Relay UE选择或重选,以及选择或重选到一个Relay UE后的处理。
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用户设备执行的方法以及用户设备。
根据本发明的第一方面的由用户设备UE执行的方法,包括:所述UE接收网络发送的RRC释放消息;在所述RRC释放消息中包含挂起配置suspendConfig信元的情况下,所述UE执行如下第一动作:若所述UE为远端UE,则所述UE进入RRC非激活态,执行小区选择cell selection或者中继选择relay selection,或者执行小区选择cell selection和中继选择relay selection。
根据本发明的第一方面的所述方法,在所述RRC释放消息中不包含所述suspendConfig信元的情况下,所述UE执行如下第二动作:若所述UE为远端UE,则所述UE进入RRC空闲态,执行小区选择cell selection或者中继选择relay selection,或者执行小区选择cell selection和中继选择relay selection。
根据本发明的第一方面的所述方法,若所述UE为远端UE,则所述RRC释放消息是所述网络经由中继UE发送的。
根据本发明的第一方面的所述方法,在所述RRC释放消息中不包含所述suspendConfig信元,并且不满足如下任意条件的情况下,所述UE才执行所述第二动作,条件1:进入RRC空闲态是由不同制式间inter-RAT小区重选触发的;条件2:在T311定时器运行期间选择一个inter-RAT小区;条件3:为IMS语音的EPS回退EPS fallback for IMS voice选择一个演进的通用陆地无线接入E-UTRA小区。
根据本发明的第二方面的由用户设备UE执行的方法,所述UE是被 上层配置需要搜索中继UE的UE,所述方法包括:在所述UE处于覆盖范围外,或者所述UE驻留的小区的参考信号接收功率RSRP测量值低于某一门限值的情况下,所述UE执行如下动作:若所述UE还没有已经选择的中继UE,或者所述UE有已经选择的中继UE并且当前选择的中继UE的侧行通信参考信号接收功率SU-RSRP或侧行通信发现消息参考信号接收功率SD-RSRP测量值低于某个门限值,或者所述UE有已经选择的中继UE并且和当前Relay UE之间的PC5-RRC连接检测到侧行通信无线链路失败,则根据所述SD-RSRP的测量结果来评估检测到的所述中继UE并从中选择一个候选的中继UE,所选择的所述一个候选的中继UE的所述SD-RSRP是超过所述某一门限值的。
根据本发明的第二方面的所述方法,所述方法还包括:执行如下任一动作:·发起PC5单播链路建立;·向所述上层指示中继选择relay selection或重选reselection;·向所述上层指示所选择的所述一个候选的中继UE;·建立PC5-RRC连接,并指示给所述上层;·指示要求所述上层建立PC5单播链路,和/或所述方法还包括:在所述上层接收到所述任一动作的指示的情况下,发起PC5单播链路建立。
根据本发明的第三方面的由用户设备UE执行的方法,所述UE是远端UE,所述UE通过中继UE向网络发送RRC重建请求RRCReestablishmentRequest消息,并启动一个定时器;在所述一个定时器超时或者所选择的小区变为不合适小区的情况下,所述UE执行如下动作:所述UE进入RRC空闲态,执行小区选择cell selection或者中继选择relay selection,或者执行小区选择cell selection和中继选择relay selection。
根据本发明的第三方面的所述方法,所述一个定时器在所述UE收到所述网络回复的RRC重建RRCReestablishment或RRC创建RRCSetup消息后停止。
根据本发明的第三方面的所述方法,所述一个定时器是T301定时器。
根据本发明的第四方面的用户设备,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所述第一方面、所述第二方面、所述第三方面的任意所述方法。
本发明的有益效果
在Remote UE从RRC_CONNECTED或RRC_INACTIVE进入/返回RRC_INACTIVE,以及在Remote UE从RRC_INACTIVE或RRC_CONNECTED进入RRC_IDLE时,Remote UE能够及时触发relay selection的处理;以及在选择或者重选到一个relay UE后,remote UE能够建立PC5unicast link和PC5-RRC连接,从而减少时延,保证业务质量。
附图说明
通过下文结合附图的详细描述,本发明的上述和其它特征将会变得更加明显,其中:
图1是示出了UE-to-UE中继的示意图。
图2(a)、图2(b)、图2(c)是分别示出了UE-to-Network中继的场景1、2、3的示意图。
图3是示出了发明的实施例1中由用户设备执行的方法的基本过程的示意图。
图4是示出了发明的实施例2中由用户设备执行的方法的基本过程的示意图。
图5是示出了发明的实施例3中由用户设备执行的方法的基本过程的示意图。
图6是示出了发明的实施例4中由用户设备执行的方法的基本过程的示意图。
图7是示出了根据本发明的实施例的用户设备的框图。
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,
UE:User Equipment 用户设备
NR:New Radio 新一代无线技术
MAC:Medium Access Control 多媒体接入控制
MAC CE:MAC control element MAC控制元素
RLC:Radio Link Control 无线链路控制
SDAP:Service Data Adaptation Protocol 服务数据适配协议
PDCP:Packet Data Convergence Protocol 分组数据汇聚协议
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,***信息块
NG-RAN:NG Radio Access Network,新一代无线接入网络
DCI:Downlink Control Information,下行控制信息
ADAPT:Adaptation layer,侧行通信适配层
PHY:physical layer,物理层
RB:radio bearer,无线承载
DRB:Data Radio Bearer,数据无线承载
SRB:Signalling Radio Bearer,信令无线承载
eDRX:Extended DRX扩展的不连续接收
Uu:空口
ProSe:Proximity based Services:近距离服务
V2X:Vehicle-to-Everything,车到万物
NAS:Non-Access-Stratum,非接入层
PC5-S:PC5signalling,PC5信令
U2N:UE-to-Network,UE到网络
L2:Layer 2,层二架构
RSRP:Reference Signal Received Power参考信号接收功率
SL-RSRP:sidelink RSRP,侧行通信参考信号接收功率
SD-RSRP:sidelink discovery RSRP,侧行通信发现消息参考信号接收功率
EPS:Evolved Packet System,演进的分组***
IMS:IP Multimedia Subsystem,IP多媒体***
E-UTRA:Evolved Universal Terrestrial Radio Access,演进的通用陆地无线接入
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,也可以指支持NR sidelink中继架构的NR设备,也可以指其他类型的NR设备或者LTE设备。Remote UE可以指通过一个U2N relay UE和网络连接的UE,也可以指一个具有NR sidelink U2N Remote UE执行能力的UE。Relay UE可以指支持为Remote UE提供到网络连接的UE,也可指具有该能力的UE。“Relay UE”和“NR sidelink U2N Relay UE”可以互换使用。
本发明中,sidelink和PC5可以互换使用。“反馈”,“报告”,“上报”,“发送”,“通知”可以互换使用。“启用”,“采用”,“应用”,“使能”,“激活”,“实现”等可以互换使用。
本发明中,中继选择(relay selection)可以仅指Remote UE在没有通过Relay UE和基站连接时选择一个Relay UE,也可以指Remote UE在没 有通过Relay UE和基站连接时选择一个Relay UE以及Remote UE已经通过Relay UE和基站连接时重新选择一个Relay UE(即Relay reselection)。
本发明中,upper layer可以指ProSe layer,或者V2X layer,或者NAS layer,或者PCS-S protocol layer。
本发明中,PC5-S link和PC5 unicast link(PC5单播链路)可以互换使用。ProSe layer,V2X layer,NAS layer,和PC5-S protocol layer可以互换使用。
需要说明的是,在本说明书中,用“和”、“或”、“和/或”连接的两者可能表示在不同应用场景下对同一意旨的不同表述方法,二者之间可能存在包含与被包含的关系,未必是指完全不同的内容。
以下,对本发明的相关技术给出说明。
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。
UE-to-UE中继如图1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。
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。
UE-to-Network中继如图2(a)、(b)、(c)所示,在图2(a)、(b)的场景1和场景2中,左侧为远端UE,中间为中继UE,右侧为网络;在图2(c)的场景3中,两侧为网络(例如,网络A、B),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。
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(例如,小区A’、B’)。
Uu RRC连接及状态
UE和无线接入网络之间的参考点被称为Uu,因此UE和无线接入网络之间的连接被称为Uu连接。在Uu连接中,根据Uu RRC连接的状态,UE的状态可以分为空闲态(RRC_IDLE state)、非激活态(RRC_INACTIVE state)、连接态(RRC_CONNECTED state)。在RRC连接建立之后,UE可以处于RRC_INACTIVE或者RRC_CONNECTED state。如果没有建立RRC连接,那么UE处于RRC_IDLE state。
Remote UE与无线接入网络之间建立了RRC连接之后,那么Remote UE可以处于RRC_INACTIVE或者RRC_CONNECTED state;如果没有建立RRC连接,那么UE处于RRC_IDLE state。类似地,Relay UE也可以处于这三种状态之一。处于RRC_CONNECTED或者RRC_INACTIVE state的Remote UE收到网络发送的携带有suspendConfig(挂起配置)的RRCRelease消息,进入或返回RRC_INACTIVE state。处于RRC_CONNECTED或RRC_INACTIVE state的Remote UE收到网络发送的没有携带suspendConfig的RRCRelease消息,进入RRC_IDLE state。
需要说明的是,当Remote UE处于RRC_CONNECTED时,Relay UE一定处于RRC_CONNECTED;当Remote UE处于RRC_INACTIVE/RRC_IDLE时,Relay UE可以处于RRC_CONNECTED/RRC_INACTIVE/RRC_IDLE三种状态中的任意一种。
Remote UE选定了一个Relay UE为自己提供中继服务后,由于应用层有数据要发送,应用层触发ProSe layer建立PC5 unicast link(Remote UE 和Relay UE之间)过程。当PC5 unicast link建立后,ProSe layer指示AS层,AS层根据ProSe layer的要求建立PC5-RRC连接,以便通过Relay UE和网络进行通信。对于NR sidelink L2U2N中继架构,Remote UE和网络之间可以有RRC连接建立、释放、重建、恢复等流程。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、恢复等流程的消息封装在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可以通过Relay UE获取到小区的***消息。Remote UE也可以通过Relay UE接收到网络的寻呼消息。
Remote UE和网络建立连接并进入RRC_CONNECTED后,停止relay selection和/或reselection。但是Remote UE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 selection和/或relay reselection。
当Remote UE选择或重选了一个Relay UE后,可能需要接收网络侧的***消息、或寻呼消息、或发送/接收其他RRC专有信令,而此时应用层并不知道这样的需求,因此无法发起PC5 unicast link和PC5-RRC连接的建立,从而无法获取到***消息和寻呼,或者无法发送/接收RRC专有信令。
本发明讨论的典型场景为:在Remote UE从RRC_CONNECTED或RRC_INACTIVE进入/返回RRC_INACTIVE,以及在Remote UE从RRC_INACTIVE或RRC_CONNECTED进入RRC_IDLE时,Remote UE如何及时触发relay selection的处理;以及在选择或者重选到一个relay UE后,remote UE如何建立PC5 unicast link和PC5-RRC连接,从而减少时延,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
如图3所示,本实施例包含步骤101和103。
可选地,在步骤101中,UE接收网络发送的RRCRelease消息。
对于Remote UE,网络发送的RRCRelease消息是通过Relay UE转发的。
可选地,在步骤103中,如果RRCRelease消息中包含suspendConfig(挂起配置)信元,则所述UE执行如下判断和动作:
-如果所述UE是通过PC5-RRC连接(connection)和一个L2 U2N Relay UE相连,即所述UE为Remote UE,则所述UE进入RRC_INACTIVE,执行cell selection或者relay selection,或者执行cell selection和relay selection。
-否则,所述UE进入RRC_INACTIVE,执行cell selection。
如果RRCRelease消息中没有包含suspendConfig信元,则所述UE执行如下动作:
-如果所述UE是通过PC5-RRC连接和一个L2 U2N Relay UE相连,即所述UE为Remote UE,则所述UE进入RRC_IDLE,执行cell selection或者relay selection,或者执行cell selection和relay selection。
-否则,所述UE进入RRC_IDLE,并执行cell selection。
可选地,如果RRCRelease消息中没有包含suspendConfig信元,还可以增加判断,只有在不满足如下任意情况下,所述UE才执行上述动作:
-进入RRC_IDLE是由inter-RAT(不同制式间)小区重选触发的;
-在T311运行期间选择一个inter-RAT小区;
-为EPS fallback for IMS voice(IMS语音的EPS回退)选择一个E-UTRA小区。
实施例2
如图4所示,本实施例包含步骤201和203。
可选地,在步骤201中,UE发起RRC连接重建过程,向网络发送RRCReestablishmentRequest消息,并启动T301定时器。T301在Remote UE收到网络回复的RRCReestablishment或RRCSetup消息后停止。
可选地,在步骤203中,如果所述T301定时器超时或者所选择的小区变为不合适小区,则所述Remote UE执行如下动作:
-如果所述UE是通过PC5-RRC连接和一个L2 U2N Relay UE相连, 即所述UE为Remote UE,则所述UE进入RRC_IDLE,执行cell selection或者relay selection,或者执行cell selection和relay selection。
-否则,所述UE进入RRC_IDLE,并执行cell selection。
实施例3
如图5所示,本实施例包含步骤301和303。
可选地,在步骤301中,Remote UE发起RRC连接重建过程,通过relay UE向网络发送RRCReestablishmentRequest消息,并启动一个定时器。所述定时器在Remote UE收到网络回复的RRCReestablishment或RRCSetup消息后停止。
可选地,在步骤303中,如果所述定时器超时或者所选择的小区变为不合适小区,则所述Remote UE进入RRC_IDLE,执行cell selection或者relay selection,或者执行cell selection和relay selection。
需要说明的是,在实施例1,实施例2和实施例3中,“执行cell selection或者relay selection”指的是执行cell selection和relay selection两者中的任意一个。“执行cell selection和relay selection”指的是执行cell selection和relay selection两者全部。
实施例4
如图6所示,本实施例包含步骤401,403和405。
可选地,在步骤401中,被上层配置需要搜索Relay UE的UE,如果所述UE处于覆盖范围外,或者如果所述UE驻留的小区的RSRP测量值低于某个门限值,则执行如下的判断和操作:
如果所述UE还没有已经选择的Relay UE,或者如果所述UE有已经选择的Relay UE并且当前选择的Relay UE的SL-RSRP或SD-RSRP测量值低于某个门限值,或者如果所述UE有已经选择的Relay UE并且和当前Relay UE之间的PC5-RRC连接检测到了sidelink无线链路失败,则根据SD-RSRP测量结果评估检测到的Relay UE并从中选择一个候选的Relay UE,所选择的候选的Relay UE的SD-RSRP是超过某一门限值的。
可选地,在步骤403中,所述UE可以执行如下操作的任意一种:
-发起PC5单播链路(unicast link)建立流程;
-指示relay selection或reselection给upper layer;
-指示所选择的候选的Relay UE给upper layer;
-建立PC5-RRC连接,并指示给upper layer;
-指示要求upper layer建立PC5单播链路。
需要说明的是,上述描述中的与UE驻留小区的RSRP测量值、当前选择的Relay UE的SL-RSRP或SD-RSRP测量值、所选择的候选的Relay UE的SD-RSRP测量值进行比较的门限值可以是由网络配置的不同参数,也可以是预配置的参数,参数取值可以相同或者不同。
可选地,在步骤405中,upper layer收到AS层指示的relay selection或reselection指示,或者收到AS层指示的选择的候选Relay UE,或者收到AS层指示的PC5-RRC建立指示,或者收到要求建立PC5单播链路的指示,则发起PC5单播链路建立过程。
可选地,步骤405的另一示例为,在Remote UE选择或者重选了一个Relay UE,Remote UE的Prose layer发起PC5单播链路建立过程;否则,Prose layer根据上层(例如应用层)要求建立PC5单播链路。在本示例中,Remote UE最终选择或者重选的L2 U2N Relay UE可能是由Prose layer决定的,也可能是由AS层(例如RRC层)决定的。可选地,在Remote UE选择或者重选了一个Relay UE后,Remote UE可以进一步判断只有所选择的Relay UE为L2 U2N Relay UE时,发起PC5单播链路建立过程。
可选地,步骤405的又一示例为,Remote UE接收Relay UE的发现(discovery)消息并选择该Relay UE为自己服务,则发起PC5单播链路建立过程。可选地,Remote UE可以进一步判断只有所选择的Relay UE为L2 U2N Relay UE时,发起PC5单播链路建立过程。
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***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***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***”可以是嵌入在该设备中的计算机***,可以包括操作***或硬件(如***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 (10)

  1. 一种由用户设备UE执行的方法,包括:
    所述UE接收网络发送的RRC释放消息;
    在所述RRC释放消息中包含挂起配置suspendConfig信元的情况下,所述UE执行如下第一动作:
    若所述UE为远端UE,则所述UE进入RRC非激活态,执行小区选择cell selection或者中继选择relay selection,或者执行小区选择cell selection和中继选择relay selection。
  2. 根据权利要求1所述的方法,其特征在于,
    在所述RRC释放消息中不包含所述suspendConfig信元的情况下,所述UE执行如下第二动作:
    若所述UE为远端UE,则所述UE进入RRC空闲态,执行小区选择cell selection或者中继选择relay selection,或者执行小区选择cell selection和中继选择relay selection。
  3. 根据权利要求1或2所述的方法,其特征在于,
    若所述UE为远端UE,则所述RRC释放消息是所述网络经由中继UE发送的。
  4. 根据权利要求2所述的方法,其特征在于,
    在所述RRC释放消息中不包含所述suspendConfig信元,并且不满足如下任意条件的情况下,所述UE才执行所述第二动作,
    条件1:进入RRC空闲态是由不同制式间inter-RAT小区重选触发的;
    条件2:在T311定时器运行期间选择一个inter-RAT小区;
    条件3:为IMS语音的EPS回退EPS fallback for IMS voice选择一个演进的通用陆地无线接入E-UTRA小区。
  5. 一种由用户设备UE执行的方法,
    所述UE是被上层配置需要搜索中继UE的UE,
    所述方法包括:
    在所述UE处于覆盖范围外,或者所述UE驻留的小区的参考信号接收功率RSRP测量值低于某一门限值的情况下,所述UE执行如下动作:
    若所述UE还没有已经选择的中继UE,或者所述UE有已经选择的中继UE并且当前选择的中继UE的侧行通信参考信号接收功率SL-RSRP或侧行通信发现消息参考信号接收功率SD-RSRP测量值低于某个门限值,或者所述UE有已经选择的中继UE并且和当前Relay UE之间的PC5-RRC连接检测到侧行通信无线链路失败,则根据所述SD-RSRP的测量结果来评估检测到的所述中继UE并从中选择一个候选的中继UE,
    所选择的所述一个候选的中继UE的所述SD-RSRP是超过所述某一门限值的。
  6. 根据权利要求5所述的方法,其特征在于,
    所述方法还包括:
    执行如下任一动作:
    ·发起PC5单播链路建立;
    ·向所述上层指示中继选择relay selection或重选reselection;
    ·向所述上层指示所选择的所述一个候选的中继UE;
    ·建立PC5-RRC连接,并指示给所述上层;
    ·指示要求所述上层建立PC5单播链路,
    和/或
    所述方法还包括:
    在所述上层接收到所述任一动作的指示的情况下,发起PC5单播链路建立。
  7. 一种由用户设备UE执行的方法,包括:
    所述UE是远端UE,
    所述UE通过中继UE向网络发送RRC重建请求RRCReestablishmentRequest消息,并启动一个定时器;
    在所述一个定时器超时或者所选择的小区变为不合适小区的情况下,所述UE执行如下动作:
    所述UE进入RRC空闲态,执行小区选择cell selection或者中继选择relay selection,或者执行小区选择cell selection和中继选择relay selection。
  8. 根据权利要求7所述的方法,其特征在于,
    所述一个定时器在所述UE收到所述网络回复的RRC重建RRCReestablishment或RRC创建RRCSetup消息后停止。
  9. 根据权利要求7或8所述的方法,其特征在于,
    所述一个定时器是T301定时器。
  10. 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9中任一项所述的方法。
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