WO2022117033A1 - 由用户设备执行的方法及用户设备 - Google Patents

由用户设备执行的方法及用户设备 Download PDF

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Publication number
WO2022117033A1
WO2022117033A1 PCT/CN2021/135060 CN2021135060W WO2022117033A1 WO 2022117033 A1 WO2022117033 A1 WO 2022117033A1 CN 2021135060 W CN2021135060 W CN 2021135060W WO 2022117033 A1 WO2022117033 A1 WO 2022117033A1
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Prior art keywords
relay
selection
cell
user equipment
perform
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PCT/CN2021/135060
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English (en)
French (fr)
Inventor
张崇铭
刘仁茂
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夏普株式会社
张崇铭
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Priority to US18/039,736 priority Critical patent/US20240008122A1/en
Publication of WO2022117033A1 publication Critical patent/WO2022117033A1/zh

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    • 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
    • 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
    • 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
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the present invention relates to the technical field of wireless communication, and more particularly, the present invention relates to a method performed by a user equipment and a corresponding user equipment.
  • a remote UE can communicate with the base station through a relay UE (relay UE).
  • relay UE relay UE
  • the remote UE After the remote UE establishes an RRC connection with the base station through the relay UE, the remote UE is in the RRC connection state. In the following cases, the remote UE can trigger the RRC connection re-establishment procedure.
  • Case 1 The connection between the remote UE and the relay UE fails. For example, the remote UE detects that the number of HARQ retransmissions exceeds a preset threshold;
  • Case 2 The remote UE receives a handover command sent by the base station to the remote UE, which can be to switch the remote UE from the currently connected relay UE to another relay UE (target relay UE), or to a cell (target cell). However, when the remote UE fails to establish a connection with the target relay UE or the target cell, the handover fails.
  • the UE only performs cell selection during the RRC connection re-establishment process, and when a suitable cell is selected, it will initiate access in the cell. But for the remote UE, the re-establishment process should consider the situation of the surrounding candidate relay UEs. Therefore, how a remote UE performs the RRC connection re-establishment process is a problem that needs to be solved.
  • the present invention proposes a solution to the following problems, that is, how a remote UE performs the RRC connection re-establishment process is a problem that needs to be solved.
  • a method performed by a user equipment is provided, which is a method for an RRC connection re-establishment process performed by the user equipment UE, including the following steps:
  • the UE triggers or starts the RRC connection re-establishment process
  • the UE starts the timer T311 and performs cell selection or relay selection;
  • the UE stops T311, wherein the above-mentioned suitable cell is a cell whose measurement value or level value satisfies the rules of cell selection, and the above-mentioned suitable medium
  • a relay is a relay whose measured value or level value satisfies the relay selection rule.
  • the non-remote UE only performs cell selection
  • the out-of-coverage remote UE only performs relay selection
  • a remote UE within coverage can perform cell selection as well as relay selection.
  • the execution order is:
  • the UE performs cell selection and relay selection according to the instructions of the network side.
  • the indication of the network side received by the UE is carried in the reconfiguration message, and the reconfiguration message also carries the information of handover or synchronization to the target relay or the target cell.
  • the indication information directly instructs the UE to only perform cell selection, or only perform relay selection, or perform cell selection first and then relay selection, or perform relay selection first and then perform cell selection; or,
  • the indication information is information used to assist the UE in determining the sequence or order of performing cell selection and relay selection.
  • the UE determines the priority of performing relay selection and cell selection according to the received reconfiguration message carrying information of handover or synchronization to the target relay or target cell.
  • the UE stops T311 when it selects a suitable relay and establishes a PC5 connection with it, which includes the following two situations:
  • the UE first selects a suitable relay, but the PC5 connection has not been established between the UE and the selected suitable relay, then the UE stops T311 after establishing the PC5 connection with the relay;
  • the UE determines that one of the relays with which the PC5 connection has been established is a suitable relay, then the UE stops T311.
  • the parameters related to cell selection and/or relay selection are set according to the type of UE,
  • the type of the above-mentioned UE is the way in which the UE and the base station are connected, or whether it is a remote UE or a non-remote UE, or whether the UE is in coverage or out of coverage.
  • the UE When the UE selects a suitable cell, the UE starts the timer T301;
  • the UE When T301 or T301-X runs out of time, the UE enters the idle state.
  • a user equipment comprising:
  • the above-mentioned instructions when executed by the above-mentioned processor, cause the above-mentioned user equipment to perform the above-mentioned method.
  • the process of RRC connection re-establishment can be appropriately performed by the UE.
  • FIG. 1 is a schematic diagram showing a communication scenario between a remote UE, a relay UE and a base station.
  • FIG. 2 is a schematic diagram showing another communication scenario between a remote UE, a relay UE and a base station.
  • FIG. 3 is a flowchart showing a method executed by a user equipment according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural block diagram of the user equipment involved in the present invention.
  • the NR mobile communication system and its subsequent evolved versions are used as an example application environment, and the base station and UE equipment supporting NR are used as examples to specifically describe various embodiments according to the present invention.
  • the present invention is not limited to the following embodiments, but can be applied to more other wireless communication systems, such as eLTE, communication systems, or NB-Iot systems, or LTE-M systems. And it can be applied to other base stations and UE devices, such as base stations and UE devices supporting eLTE/NB-Iot/LTE-M.
  • the near field communication method mentioned in this article mainly refers to a side link (sidellink) connection. It can also be a WIFI connection, or other connection methods.
  • the reference point based on the sidelink connection between the UE and the UE is called PC5, so the connection between the remote UE and the relayUE can be called the PC5 connection.
  • 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.
  • 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).
  • RRC_IDLE state an idle state
  • RRC_INACTIVE state an inactive state
  • RRC_CONNECTED state a connected state
  • the UE may be in INACTIVE or CONNECTED state. If no RRC connection is established, the UE is in IDLE state.
  • the remote UE can be in the INACTIVE or CONNECTED state; if the RRC connection is not established, the UE is in the IDLE state. Similarly, the relay UE can also be in one of these three states.
  • the relay UE when the remote UE is in the RRC connected state, the relay UE must be in the RRC connected state; when the remote UE is in the RRC INACTIVE/IDLE state, the relay UE can be in any of the three states of RRC connected state, INACTIVE/IDLE A sort of.
  • the PC5 connection between the remote UE and the relay UE does not affect the Uu connection of the remote UE or the relay UE, and the two connections are independent.
  • the UE when the RRC connection re-establishment process is triggered, the UE starts the timer T311 and performs cell selection. If there is no suitable cell all the time, when T311 runs out of time, the UE will perform corresponding operations and enter the IDLE state, and the reason for RRC connection release can be set as RRC connection failure.
  • FIG. 1 A typical scenario described in this paper is shown in Figure 1.
  • the left side is the remote UE
  • the middle is the relay UE
  • the right side is the base station, which communicates with the relay UE on behalf of the radio access network.
  • Remote UE and relay UE are connected through PC5.
  • the ellipse indicates the coverage area of the base station. Since the remote UE is not within the coverage of the base station, it cannot communicate with the base station directly, thus requiring the relay UE to provide relay services.
  • Such remote UEs belong to remote UEs that are out of coverage.
  • FIG. 2 Another typical scenario described in this paper is shown in Figure 2.
  • the left side is the remote UE, the middle is the relay UE, and the right side is the base station, which communicates with the relay UE on behalf of the radio access network.
  • Remote UE and relay UE are connected through PC5.
  • the ellipse indicates the coverage area of the base station.
  • the remote UE is at the edge of the coverage of the base station. Because the signal of the base station is weak, it cannot directly communicate with the base station, so the relay UE is required to provide relay services.
  • Such remote UEs belong to remote UEs in coverage.
  • this embodiment provides a method performed by a user equipment, which is a method for an RRC connection re-establishment process performed by the user equipment.
  • Step 1 The UE triggers or initiates an RRC connection re-establishment process (refer to step S301).
  • the UE may cause the RRC connection re-establishment process to be triggered or started, which is not limited here:
  • Integrity check failure (upon integrity check failure).
  • Step 2 During the process of starting the RRC connection re-establishment, the UE starts (starts) the timer T311 and performs cell selection (cell selection) or relay selection (relay selection) (refer to step S302).
  • the existing T311 as an example here, it may also be a newly defined timer used for RRC connection re-establishment.
  • the non-remote UE only performs cell selection
  • the remote UE can perform cell selection and relay selection.
  • the remote UE out of coverage only performs relay selection; the remote UE in coverage can perform cell selection and relay selection.
  • the order of execution can be as follows:
  • Cell selection is performed first, and when the result of cell selection is that there is no suitable cell, relay selection is performed; preferably, the UE performs cell selection first, and starts timer 1. When timer 1 runs out of time, the result of cell selection is that there is no suitable cell. The UE performs relay selection; if during the running of timer 1, the result of cell selection is that a suitable cell is selected, the UE stops timer 1. That is, the UE performs cell selection first within a period of time, and performs relay selection when there is no suitable cell. When the set duration of timer 1 is infinite, it can be considered that the UE only performs cell selection; when the set duration of timer 1 is 0, it can be considered that the UE only performs relay selection.
  • Relay selection is performed first, and when the result of relay selection is that there is no suitable relay, cell selection is performed; preferably, the UE performs relay selection first, and starts timer 2. When timer 2 runs out of time, the result of relay selection is no If a suitable relay is found, the UE performs cell selection; if the result of cell selection during the running of timer 2 is that an appropriate relay is selected, the UE stops timer 2. That is, the UE performs relay selection first within a period of time, and performs cell selection when there is no suitable relay. When the set duration of timer 2 is infinite, it can be considered that the UE only performs relay selection; when the set duration of timer 2 is 0, it can be considered that the UE only performs cell selection.
  • Timer 1 and Timer 2 can be the same timer.
  • the UE can also perform cell selection and relay selection according to the instruction of the network side.
  • the UE may receive an indication from the network side, and such an indication may be carried in a reconfiguration message.
  • a reconfiguration message also carries information of handover or synchronization to the target relay or target cell.
  • a displayed indication manner may be that the indication information may directly instruct the UE to only perform cell selection, or to perform only relay selection, or to perform cell selection first and then relay selection; or to perform relay selection first and then perform cell selection. choose.
  • the indication information may also be information used to assist the UE in determining the sequence or order of performing cell selection and relay selection, such as cell selection or relay selection priority information. For example, if the priority of relay selection is set higher than the priority of cell selection, then the UE will always preferentially perform relay selection based on the indication information, and otherwise, preferentially perform cell selection.
  • An implicit indication method may be that the UE determines the priority of performing relay selection and cell selection according to a received reconfiguration message that carries information on switch/handover or synchronization to the target relay or target cell. For example, if the reconfiguration message received by the UE carries the information of synchronizing to (or switching to) the target relay, then when the reconfiguration for synchronization fails, the re-establishment process is started. In this process, the UE preferentially performs relay selection. For another example, the reconfiguration message received by the UE carries the information of synchronizing to the target cell, then when the reconfiguration for synchronization fails, a re-establishment process is started, in which the UE preferentially performs cell selection.
  • Step 3 In one of the following situations, the UE stops T311 (refer to step S303):
  • -UE selects a suitable cell (a suitable cell)
  • -UE selects a suitable relay (a suitable relay)
  • a suitable cell refers to a cell whose measurement value or level value satisfies the rules for cell selection.
  • a suitable cell may refer to that the reception level value of the UE in the selected cell satisfies a certain criterion, such as the existing S criterion (criterion S).
  • a certain criterion such as the existing S criterion (criterion S).
  • criterion S the existing S criterion
  • Such a receiving level value may be calculated according to a measured value of the receiving level of the cell, such as RSRP or RSRQ, or calculated in other ways, which is not limited here.
  • a suitable relay refers to a relay whose measured value or level value satisfies the rules for relay selection.
  • a suitable relay can be any suitable relay.
  • the UE measures/detects the wireless signal of the PC5 interface, such as the measurement value obtained by measuring the wireless signal strength of the sidelink discovery message.
  • the relay can be determined. It is a suitable relay; it can also be the RSRP value of the sidelink unicast connection measured by the UE.
  • the relay selection criteria it can be determined that the relay is a suitable relay.
  • the criterion for relay selection here may be that the measured value or the level value is not lower than a preset threshold, and the like.
  • the UE may also stop T311 when a suitable relay is selected and a PC5 connection is established therewith. This includes two cases:
  • Case 1 The UE first selects the appropriate relay, but the PC5 connection has not been established between the UE and the selected appropriate relay, then the UE stops T311 after establishing the PC5 connection with the relay;
  • Case 2 It can also be that the UE determines that one of the relays with which the PC5 connection has been established is a suitable relay, then the UE can stop T311.
  • the UE if the UE does not have a suitable relay or a suitable cell to choose, then when the T311 runs overtime, the UE enters an idle state.
  • the type of the UE preferably, refers to the manner in which the UE and the base station are connected.
  • the UE sets the value of the parameter nosuitableCellFound to be true, and this parameter will be recorded in the report provided by the UE to the base station;
  • the UE may not set the parameter nosuitableCellFound to be true in the case of T311 running timeout; or in the case of T311 running timeout, the UE You can also set the value of the parameter nosuitablerelayFound to true.
  • the UE does not set the value of the parameter nosuitableCellFound to be true when T311 runs out of time; if the UE also performs cell selection during the re-establishment process If the relay selection is enabled, the UE can also set the value of the parameter nosuitablerelayFound to true when the T311 runs out of time.
  • nosuitableCellFound refers to the parameter used to record no suitable cell
  • nosuitablerelayFound refers to the parameter used to record no suitable relay, when they are true, it means that there is no suitable cell/relay, when they are false, Indicates that a suitable cell/relay exists.
  • the type of UE here may also refer to remote UE or non-remote UE.
  • the so-called remote UE refers to the UE that establishes an RRC connection with the base station through the relay
  • the non-remote UE refers to the UE that does not establish an RRC connection with the base station through the relay, or directly communicates with the base station on the Uu port.
  • the UE may not set the value of the parameter nosuitableCellFound to be true when the T311 operation times out; or the UE may also set the value of the parameter nosuitablerelayFound to be true when the operation of the T311 times out.
  • the UE sets the value of the parameter nosuitableCellFound to be true in the case of T311 running timeout; If the relay is selected, the UE can also set the value of the parameter nosuitablerelayFound to be true when the T311 runs out of time.
  • the UE sets the value of the parameter nosuitableCellFound to true.
  • the type of UE may also refer to whether the UE is in coverage (in coverage) or out of coverage (out of coverage).
  • the UE For the UE in coverage, in the case of T311 running timeout, the UE sets the value of the parameter nosuitableCellFound to be true, and optionally, if the UE also selects the relay, then the UE sets the value of the parameter nosuitablerelayFound to be true;
  • E sets the value of the parameter nosuitablerelayFound to true.
  • Embodiment 1 when the UE selects a suitable cell, the UE starts the timer T301; when the UE selects a suitable relay, it starts the timer T301-X.
  • This embodiment can also be used alone, using The RRC re-establishment process when the UE selects a suitable relay. Taking the existing T301 as an example here, it may also be a newly defined timer for RRC connection re-establishment.
  • T301 and T301-X can be broadcast in the system information, or sent to the UE through dedicated signaling.
  • the UE When T301 or T301-X runs out of time, the UE enters the idle state.
  • Another implementation of this solution can be:
  • the UE When the UE selects a suitable cell, the UE sets the value of T301 to the value broadcast in the system information, or the value contained in the information element spcellconfig, and then starts the timer T301;
  • the UE When the UE selects a suitable relay, the UE sets the value of T301 to the value broadcast in the system information for the remote UE, or the value contained in the switch/handover command received by the UE and used for the remote UE. Depending on the value of T301, the handover command instructs the UE to switch (switch/handover) from the current relay or serving cell to a target relay, and then start the timer T301.
  • the UE when the UE receives the RRC connection re-establishment message, it can stop the running timer T301 or T301-X.
  • FIG. 4 is a schematic structural block diagram of the user equipment involved in the present invention.
  • 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 (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory, or the like.
  • Program instructions are stored on the memory 402 . When the instruction is executed by the processor 401, 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

本发明提供一种由用户设备执行的方法及用户设备。由用户设备执行的方法是由用户设备UE执行的RRC连接重建立过程的方法，包括如下步骤：UE触发或者启动RRC连接重建立过程；在启动RRC连接重建立的过程中，UE启动定时器T311以及执行小区选择或者中继选择；在UE选择了一个合适的小区或者UE选择了一个合适的中继的情况下，UE停止T311，其中，上述合适的小区是测量值或者电平值满足小区选择的规则的小区，上述合适的中继是测量值或者电平值满足中继选择的规则的中继。

Description

由用户设备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的方法以及相应的用户设备。
背景技术
为了提供服务，在一种场景下，一个远端UE(remote UE)可以通过一个中继UE(relay UE)和基站进行通讯连接。
当remote UE通过relay UE与基站建立RRC连接之后，remote UE处于RRC连接态。在下述情况下，remote UE可以触发RRC连接重建立过程。
情况1：remote UE和relay UE之间的连接发生了失败，例如，remote UE检测到HARQ重传次数超过了预先设定的门限值；
情况2：remote UE接收到基站发送给remote UE的切换命令，可以是将remot UE从当前连接的relay UE切换到另外一个relay UE(目标relay UE)，或者是切换到一个小区(目标小区)。但是remote UE在与目标relay UE或者是目标小区建立连接时发生了失败，从而导致切换失败。
在现有技术中，UE在执行RRC连接重建立过程中仅执行小区选择，当选择到合适的小区时，会在该小区发起接入。但是对remote UE而言，重建立的过程应该考虑周围存在的候选的relay UE的情况。因此一个remote UE如何执行RRC连接重建立的过程是需要解决的问题。
发明内容
本发明针对以下问题提出了解决方案，即，针对一个remote UE如何执行RRC连接重建立的过程是需要解决的问题提出了解决方案。
根据本发明的一个方面，提供了一种由用户设备执行的方法，是由用户设备UE执行的RRC连接重建立过程的方法，包括如下步骤：
UE触发或者启动RRC连接重建立过程；
在启动RRC连接重建立的过程中，UE启动定时器T311以及执行小区选择或者中继选择；
在UE选择了一个合适的小区或者UE选择了一个合适的中继的情况下，UE停止T311，其中，上述合适的小区是测量值或者电平值满足小区选择的规则的小区，上述合适的中继是测量值或者电平值满足中继选择的规则的中继。
在上述的由用户设备执行的方法中，优选的是，
非远端UE仅执行小区选择；
覆盖外的远端UE仅执行中继选择；
覆盖内的远端UE能够执行小区选择以及中继选择。
在上述的由用户设备执行的方法中，优选的是，
上述能够执行小区选择以及中继选择的UE，执行的顺序是：
先执行小区选择，在小区选择的结果为没有合适的小区时，再执行中继选择；
先执行中继选择，在中继选择的结果为没有合适的中继时，再执行小区选择；或者
UE根据网络侧的指示来进行小区选择以及中继选择。
在上述的由用户设备执行的方法中，优选的是，
UE接收到的网络侧的指示携带在重配置消息中，该重配置消息还携带了切换或者同步到目标中继或者目标小区的信息。
在上述的由用户设备执行的方法中，优选的是，
该指示信息直接指示UE仅执行小区选择，或者仅执行中继选择，或者是先执行小区选择然后再执行中继选择，又或者是先执行中继选择然后再执行小区选择；或者，
该指示信息是用于辅助UE确定执行小区选择以及中继选择的顺序或者次序的信息。
在上述的由用户设备执行的方法中，优选的是，
UE根据接收到的携带了切换或者同步到目标中继或者目标小区的信息的重配置消息来确定执行中继选择和小区选择的优先级。
在上述的由用户设备执行的方法中，优选的是，
UE在选择了合适的中继并且与其建立了PC5连接的情况下停止T311，这包含如下两种情况：
UE先选择了合适的中继，但是UE与这个所选择的合适的中继之间还没有建立PC5连接，那么UE在与该中继建立PC5连接之后停止T311；
UE在与其已经建立了PC5连接的中继中确定其中一个为合适的中继，那么UE停止T311。
在上述的由用户设备执行的方法中，优选的是，
当T311运行超时时，根据UE的类型来设置与小区选择以及/或者中继选择相关的参数，
其中，上述UE的类型是UE和基站连接的方式，或者是远端UE或者非远端UE，或者是该UE是处于覆盖内还是处于覆盖外。
在上述的由用户设备执行的方法中，优选的是，
当UE选择了一个合适的小区时，UE启动定时器T301；
当UE选择了一个合适的中继时，启动定时器T301-X；
当T301或者T301-X运行超时时，UE进入空闲态。
根据本发明的另一个方面，提供了一种用户设备，包括：
处理器；以及
存储器，存储有指令，
上述指令在由上述处理器运行时，使上述用户设备执行上文所描述的方法。
根据本公开所涉及的由用户设备执行的方法以及相应的用户设备，能够由UE适当地执行RRC连接重建立的过程。
附图说明
图1是表示远端UE、中继UE和基站之间的一种通信场景的示意图。
图2是表示远端UE、中继UE和基站之间的另一种通信场景的示意图。
图3是表示本发明的一实施例涉及的由用户设备执行的方法的流程图。
图4是本发明涉及的用户设备的简要结构框图。
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。
在具体描述之前，先对本发明中提到的若干术语做如下说明。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
LTE    Long Term Evolution长期演进技术
eLTE   Enhaced Long Term Evolution增强的长期演进技术
RRC    Radio Resource Control无线资源控制(层)
MAC    Medium Access Control媒体接入控制(层)
MAC CE MAC Control Element MAC控制元素
SDAP Service Data Adaptation Protocol业务数据自适应层协议
下文以NR移动通信系统及其后续的演进版本作为示例应用环境，以支持NR的基站和UE设备为例，具体描述了根据本发明的多个实施方式。然而，需要指出的是，本发明不限于以下实施方式，而是可适用于更多其它的无线通信系统，例如eLTE，通信系统，或者是NB-Iot系统，又或者是LTE-M系统。而且可以适用于其他基站和UE设备，例如支持eLTE/NB-Iot/LTE-M的基站和UE设备。
近场通信
Remote UE和relay UE通过近场通信的方式进行无线连接，传输数据或信令。在本文中提到的近场通信方式主要是指侧链路(sidellink)连接。还可以是WIFI连接，或者其他连接方式。UE和UE之间基于sidelink连接的参考点(reference point)被称为PC5，因此remote UE和relayUE之间的连接可以被称为PC5连接。
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INACTIVE或者CONNECTED state。如果没有建立RRC连接，那么UE处于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INACTIVE或者CONNECTED state；如果没有建立RRC连接，那么UE处于IDLE state。类似地，relay UE也可以处于这三种状态之一。
需要说明的是，当remote UE处于RRC connected state时，relay UE一定处于RRC connected state；当remote UE处于RRC INACTIVE/IDLE state时，relay UE可以处于RRC connected state，INACTIVE/IDLE三种状态中的任意一种。
此外remote UE和relay UE之间的PC5的连接并不影响remote UE或者relay UE的Uu连接，两种连接是独立的。
RRC连接重建立过程
在现有技术中，当RRC连接重建立过程被触发时，UE会启动定时器T311，并且进行小区选择。如果一直没有合适的小区，那么当T311运行超时时，UE会执行相应的操作，并进入空闲态(IDLE state)，以及可以设置RRC连接释放的原因值为RRC连接失败。
本文描述的一种典型场景如图1所示，左侧为远端UE，中间为relay UE，右侧为基站，代表无线接入网与relay UE通信。Remote UE和relay UE通过PC5连接。椭圆表示基站的覆盖范围。由于remote UE不在基站的覆盖范围内，因此无法直接与基站通信，从而需要relay UE提供中继服务。这样的remote UE属于覆盖外(out of coverage)的remote UE。
本文描述的另外一种典型场景如图2所示，左侧为远端UE，中间为relay UE，右侧为基站，代表无线接入网与relay UE通信。Remote UE和relay UE通过PC5连接。椭圆表示基站的覆盖范围。remote UE处于基站覆盖的边缘，由于基站的信号较弱，因此也无法直接与基站通信，从而需要relay UE提供中继服务。这样的remote UE属于覆盖内(in coverage)的remote UE。
实施例1
如图3所示，本实施例给出了一种由用户设备执行的方法，是由用户设备执行的RRC连接重建立过程的方法。
步骤一：UE触发(trigger)或者启动(initiate)RRC连接重建立过程(参照步骤S301)。
UE在下述情况下，都可能导致RRC连接重建立过程被触发或者被启动，这里不对此进行限制：
检测到无线链路失败(upon detecting radio link failure)；
用于同步的重配置发生失败(upon reconfiguration with sync failure)；
完整性校验失败(upon integrity check failure)。
步骤二：在启动RRC连接重建立的过程中，UE启动(start)定时器T311以及执行小区选择(cell selection)或者是relay选择(relay selection)(参照步骤S302)。这里以现有T311为例，还可以是一个新定义的，用于RRC连接重建立的定时器。
优选的，非remote UE仅执行小区选择；
优选的，remote UE可以执行小区选择以及relay选择。
优选的，out of coverage的remote UE仅执行relay选择；in coverage的remote UE可以执行小区选择以及relay选择。
对于上述可以执行小区选择以及relay选择的UE，执行的顺序可以有如下操作：
先执行小区选择，在小区选择的结果为没有合适的小区时，执行relay选择；优选的，UE先执行小区选择，并启动定时器1，在定时器1 运行超时时小区选择的结果为没有合适的小区，那么UE执行relay选择；如果在定时器1运行期间，小区选择的结果为选定了合适的小区，那么UE停止定时器1。即UE在一段时间内先执行小区选择，在没有合适的小区的情况下，执行relay选择。当定时器1的设置时长为无限大时，可以认为UE仅执行小区选择；当定时器1的设置时长为0时，可以认为UE仅执行relay选择。
先执行relay选择，在relay选择的结果为没有合适的relay时，执行小区选择；优选的，UE先执行relay选择，并启动定时器2，在定时器2运行超时时，relay选择的结果为没有合适的relay，那么UE执行小区选择；如果在定时器2运行期间，小区选择的结果为选定了合适的relay，那么UE停止定时器2。即UE在一段时间内先执行relay选择，在没有合适的relay的情况下，执行小区选择。当定时器2的设置时长为无限大时，可以认为UE仅执行relay选择；当定时器2的设置时长为0时，可以认为UE仅执行小区选择。
定时器1和定时器2可以是一个相同的定时器。
此外，UE还可以根据网络侧的指示来进行小区选择以及relay选择。UE可以接收网络侧的指示，这样的指示可以携带在重配置消息中，优选的，这样的重配置消息还携带了切换或者同步到目标relay或者目标小区的信息。
一种显示的指示方式可以是，该指示信息可以直接指示UE仅执行小区选择，或者仅执行relay选择，或者是先执行小区选择然后再执行relay选择；又或者是先执行relay选择然后再执行小区选择。该指示信息还可以是用于辅助UE确定执行小区选择以及relay选择的顺序或者次序的信息，例如小区选择或者是relay选择的优先级信息。例如设置relay选择的优先级高于小区选择的优先级，那么UE基于该指示信息，总是优先执行relay选择，反之则优先执行小区选择。
一种隐式的指示方式可以是UE根据接收到的、携带了切换(switch/handover)或者同步到目标relay或者目标小区的信息的重配置消息来确定执行relay选择和小区选择的优先级。例如，UE接收到的重 配置消息中携带了同步到(或者切换到)目标relay的信息，那么在该用于同步的重配置发生失败时，启动的重建立过程。在该过程中UE优先执行relay选择。又例如，UE接收到的重配置消息中携带了同步到目标小区的信息，那么在该用于同步的重配置发生失败时，启动的重建立过程，在该过程中UE优先执行小区选择。
步骤三：在下述情况之一，UE停止T311(参照步骤S303)：
-UE选择了一个合适的小区(a suitable cell)
-UE选择了一个合适的relay(a suitable relay)
合适的小区是指测量值或者电平值满足小区选择的规则的小区。
合适的小区可以是指UE在被选择的小区的接收电平值满足某个准则，例如现有的S准则(criterion S)。这样的接收电平值可以根据小区接收电平的测量值，例如RSRP或者RSRQ计算出来的，或者是其他的方式计算所得，这里不做限制。
合适的relay是指测量值或者电平值满足relay选择的规则的relay。
合适的relay可以是
UE测量/检测PC5接口的无线信号，例如测量sidelink discovery消息的无线信号强度获得的测量值，当该测量值或者是基于测量值计算出的电平值满足relay选择的准则时，可以认定该relay是一个合适的relay；还可以是UE测量sidelink单播连接的RSRP值，当该测量值或者是基于测量值计算出的电平值满足relay选择的准则时，可以认定该relay是一个合适的relay。这里对relay选择的准则可以是测量值或者电平值不低于预先设定的阈值等。
优选的，UE还可以在选择了合适的relay并且与其建立了PC5连接的情况下停止T311。这包含两种情况：
情况一：UE先选择了合适的relay，但是UE与这个所选择的合适的relay之间还没有建立PC5连接，那么UE在与该relay建立PC5连接之后停止T311；
情况二：还可以是UE在与其已经建立了PC5连接的relay中确定其中一个为合适的relay，那么UE可以停止T311.
作为本方案的补充，UE如果一直没有合适的relay或者合适的小区可以选择，那么当T311运行超时时，UE进入空闲态。
实施例2
在实施例1的基础上，当T311运行超时时，根据UE的类型来设置与小区选择以及/或者relay选择相关的参数。这里UE的类型，优选的，是指UE和基站连接的方式。例如：
当UE与基站的连接是通过Uu口直接连接的，那么在T311运行超时的情况下，UE设置参数nosuitableCellFound的取值为真，该参数将被记录在UE向基站提供的报告中；
当UE与基站的连接是通过relayUE进行的，即非直接连接的，那么在T311运行超时的情况下UE可以不设置参数nosuitableCellFound的取值为真；又或者是在T311运行超时的情况下，UE还可以设置参数nosuitablerelayFound的取值为真。优选的，UE根据实际情况，如果UE在重建立的过程中执行了小区选择，那么在T311运行超时的情况下，UE没置参数nosuitableCellFound的取值为真；如果UE在重建立过程中还执行了relay选择，那么在T311运行超时的情况下，UE还可以设置参数nosuitablerelayFound的取值为真。
这里nosuitableCellFound是指用于记录没有合适小区的参数，而nosuitablerelayFound是指用于记录没有合适relay的参数，当他们取值为真时，表示没有合适的小区/relay，当他们取值为假时，表示存在合适的小区/relay。
这里UE的类型还可以是指remote UE或者非remote UE。所谓remote UE就是指通过relay和基站建立RRC连接的UE，而非remote UE则是指不通过relay和基站建立RRC连接的UE，或者是直接与基站在Uu口进行通信的UE。例如：
对于remote UE，在T311运行超时的情况下UE可以不设置参数nosuitableCellFound的取值为真；又或者是在T311运行超时的情况下，UE还可以设置参数nosuitablerelayFound的取值为真。优选的，UE根据实际情况，如果UE在重建立的过程中执行了小区选择，那么在T311运 行超时的情况下，UE设置参数nosuitableCellFound的取值为真；如果UE在重建立过程中还执行了relay选择，那么在T311运行超时的情况下，UE还可以设置参数nosuitablerelayFound的取值为真。
对于非remote UE，在T311运行超时的情况下，UE设置参数nosuitableCellFound的取值为真。
此外UE的类型还可以是指该UE是处于覆盖内(in coverage)还是覆盖之外(out of coverage)。例如
对于in coverage的UE，在T311运行超时的情况下，UE设置参数nosuitableCellFound的取值为真，以及可选的，如果UE还进行了relay选择，那么UE设置参数nosuitablerelayFound的取值为真；
对于out of coverage的UE，在T311运行超时的情况下，E设置参数nosuitablerelayFound的取值为真。
实施例3
在实施例1的基础上，当UE选择了一个合适的小区时，UE启动定时器T301；当UE选择了一个合适的relay时，启动定时器T301-X.本实施例也可以单独使用，用于在UE选择合适relay时的RRC重建立的流程。这里以现有T301为例，还可以是一个新定义的，用于RRC连接重建立的定时器。
T301和T301-X的取值可以在系统信息中广播，或者是通过专有的信令发送给UE。
当T301或者T301-X运行超时时，UE进入空闲态。
本方案的另一实现方式可以是，
当UE选择了一个合适的小区时，UE设置T301的取值为系统信息中广播的取值，或者是在信元spcellconfig中包含的取值，然后启动定时器T301；
当UE选择了一个合适的relay时，UE设置T301的取值为系统信息中广播的、用于remote UE的取值，或者是在UE接收到的切换(switch/handover)命令中包含的、用于T301的取值，该切换命令指示 了UE从当前的relay或者服务小区切换(switch/handover)到一个目标relay，然后启动定时器T301。
作为本方案的补充，当UE接收到RRC连接重建立的消息时，可以停止运行的定时器T301或者T301-X。
图4是本发明涉及的用户设备的简要结构框图。如图4所示，该用户设备UE400包括处理器401和存储器402。处理器401例如可以包括微处理器、微控制器、嵌入式处理器等。存储器402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402上存储有程序指令。该指令在由处理器401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 (10)

  1. 一种由用户设备执行的方法，是由用户设备UE执行的RRC连接重建立过程的方法，包括如下步骤：
    UE触发或者启动RRC连接重建立过程；
    在启动RRC连接重建立的过程中，UE启动定时器T311以及执行小区选择或者中继选择；
    在UE选择了一个合适的小区或者UE选择了一个合适的中继的情况下，UE停止T311，其中，上述合适的小区是测量值或者电平值满足小区选择的规则的小区，上述合适的中继是测量值或者电平值满足中继选择的规则的中继。
  2. 根据权利要求1所述的由用户设备执行的方法，其中，
    非远端UE仅执行小区选择；
    覆盖外的远端UE仅执行中继选择；
    覆盖内的远端UE能够执行小区选择以及中继选择。
  3. 根据权利要求2所述的由用户设备执行的方法，其中，
    上述能够执行小区选择以及中继选择的UE，执行的顺序是：
    先执行小区选择，在小区选择的结果为没有合适的小区时，再执行中继选择；
    先执行中继选择，在中继选择的结果为没有合适的中继时，再执行小区选择；或者
    UE根据网络侧的指示来进行小区选择以及中继选择。
  4. 根据权利要求3所述的由用户设备执行的方法，其中，
    UE接收到的网络侧的指示携带在重配置消息中，该重配置消息还携带了切换或者同步到目标中继或者目标小区的信息。
  5. 根据权利要求4所述的由用户设备执行的方法，其中，
    该指示信息直接指示UE仅执行小区选择，或者仅执行中继选择，或者是先执行小区选择然后再执行中继选择，又或者是先执行中继选择然后再执行小区选择；或者，
    该指示信息是用于辅助UE确定执行小区选择以及中继选择的顺序 或者次序的信息。
  6. 根据权利要求4所述的由用户设备执行的方法，其中，
    UE根据接收到的携带了切换或者同步到目标中继或者目标小区的信息的重配置消息来确定执行中继选择和小区选择的优先级。
  7. 根据权利要求1-6中任一项所述的由用户设备执行的方法，其中，
    UE在选择了合适的中继并且与其建立了PC5连接的情况下停止T311，这包含如下两种情况：
    UE先选择了合适的中继，但是UE与这个所选择的合适的中继之间还没有建立PC5连接，那么UE在与该中继建立PC5连接之后停止T311；
    UE在与其已经建立了PC5连接的中继中确定其中一个为合适的中继，那么UE停止T311。
  8. 根据权利要求1-6中任一项所述的由用户设备执行的方法，其中，
    当T311运行超时时，根据UE的类型来设置与小区选择以及/或者中继选择相关的参数，
    其中，上述UE的类型是UE和基站连接的方式，或者是远端UE或者非远端UE，或者是该UE是处于覆盖内还是处于覆盖外。
  9. 根据权利要求1-6中任一项所述的由用户设备执行的方法，其中，
    当UE选择了一个合适的小区时，UE启动定时器T301；
    当UE选择了一个合适的中继时，启动定时器T301-X；
    当T301或者T301-X运行超时时，UE进入空闲态。
  10. 一种用户设备，包括：
    处理器；以及
    存储器，存储有指令，
    上述指令在由上述处理器运行时，使上述用户设备执行根据权利要求1-9中任一项所述的方法。
PCT/CN2021/135060 2020-12-03 2021-12-02 由用户设备执行的方法及用户设备 WO2022117033A1 (zh)

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