WO2022257975A1 - 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
WO2022257975A1
WO2022257975A1 PCT/CN2022/097647 CN2022097647W WO2022257975A1 WO 2022257975 A1 WO2022257975 A1 WO 2022257975A1 CN 2022097647 W CN2022097647 W CN 2022097647W WO 2022257975 A1 WO2022257975 A1 WO 2022257975A1
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Prior art keywords
message
user equipment
connection
target relay
base station
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PCT/CN2022/097647
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English (en)
French (fr)
Inventor
张崇铭
刘仁茂
Original Assignee
夏普株式会社
张崇铭
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Application filed by 夏普株式会社, 张崇铭 filed Critical 夏普株式会社
Priority to EP22819572.3A priority Critical patent/EP4354963A1/en
Publication of WO2022257975A1 publication Critical patent/WO2022257975A1/zh

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    • 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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/03—Reselecting a link using a direct mode connection
    • H04W36/033—Reselecting a link using a direct mode connection in pre-organised networks
    • 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
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/23—Manipulation of direct-mode connections
    • 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

Definitions

  • the present invention relates to the technical field of wireless communication, and more specifically, the present invention relates to a method executed by a user equipment and the user equipment.
  • a user equipment UE can directly communicate with the base station, and such a communication connection is called a direct connection (direct connection).
  • the UE can also communicate with the base station through a relay UE (relay UE), and this connection can be called an indirect connection (indirect connection).
  • relay UE relay UE
  • this connection can be called an indirect connection (indirect connection).
  • the relay UE communicates with the base station
  • the UE is called a remote UE (remote UE).
  • the UE directly connected to the base station can be switched (switch/handover) to a relay UE under the instruction of the base station, thereby realizing an indirect connection with the base station.
  • the present invention provides a method executed by user equipment and the user equipment.
  • a method performed by user equipment including the following steps:
  • the user equipment UE receives a message or command sent from the base station, wherein the message is an RRC reconfiguration message, and the message at least includes information about handing over the UE to the target relay UE, or instructs the UE to pass the target relay UE.
  • the UE Upon receiving the above-mentioned message or command, the UE performs switching from a direct connection with the base station to an indirect connection between the UE and the base station through a relay based on the above-mentioned message or command.
  • the UE Upon receiving the above message or command, the UE starts the handover management timer.
  • the UE If the UE sends a response message to the above message or command during the operation of the above handover management timer, then the UE stops the running handover management timer;
  • the UE If the UE does not send a response message to the above message or command during the operation of the above-mentioned handover management timer, then when the handover management timer runs out, the UE triggers or starts the RRC connection re-establishment process, and performs cell selection and relay UE selection.
  • the UE If the UE receives indication information during the running of the handover management timer and the indication information includes at least information about the successful establishment of the PC5 connection between the UE and the target relay UE, then the UE stops running the handover management timer.
  • the UE determines that there is a PC5 connection with the above-mentioned target relay UE, then the UE stops running the handover management timer;
  • the UE determines that there is no PC5 connection with the above-mentioned target relay UE, then when the UE receives the indication information and the indication information contains at least relevant information about the successful establishment of the PC5 connection between the UE and the above-mentioned target relay UE, the UE stops Running switch management timer.
  • the UE When receiving the above message or command, the UE determines whether there is a PC5 connection with the above target relay UE.
  • the UE determines that there is a PC5 connection with the above-mentioned target relay UE, the UE does not start the handover management timer;
  • the UE determines that there is no PC5 connection with the target relay UE, the UE starts a handover management timer.
  • the UE If the UE sends a response message to the above message or command during the operation of the above handover management timer, then the UE stops the running handover management timer;
  • the UE If the UE does not send a response message to the above message or command during the operation of the above-mentioned handover management timer, then when the handover management timer runs out, the UE triggers or starts the RRC connection re-establishment process, and performs cell selection and relay UE selection.
  • the UE When the UE receives the response information to the above response message, the UE stops the running handover management timer,
  • the response information to the above response message is:
  • the PC5RRC message or PC5-S message sent by the target relay UE received by the UE after sending the above response message;
  • the RRC reconfiguration message from the base station received by the UE after sending the above response message;
  • the confirmation information ACK received by the UE from the lower layer after sending the above response message;
  • the UE After sending the above response message, the UE receives the acknowledgment information ACK sent by the target relay UE.
  • a user equipment including:
  • the above-mentioned instructions when executed by the above-mentioned processor, cause the above-mentioned user equipment to perform the method according to the above-mentioned description.
  • the UE can effectively manage the switching process from direct connection to non-direct connection.
  • FIG. 1 is a schematic diagram showing UE-to-Network relay.
  • Fig. 2 is a schematic diagram showing a UE-to-Network relay architecture interface.
  • 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 brief structural block diagram of the user equipment involved in the present invention.
  • RRC Radio Resource Control Radio Resource Control
  • RRC_IDLE RRC idle state
  • RAN Radio Access Network, wireless access layer
  • the NR mobile communication system and its subsequent evolution versions are taken as an example application environment, and a base station and UE equipment supporting NR are taken as examples to describe multiple embodiments of the present invention in detail.
  • the present invention is not limited to the following embodiments, but is applicable to more other wireless communication systems, such as eLTE, a communication system, or an NB-Iot system, or an LTE-M system.
  • it can be applied to other base stations and UE equipment, such as base stations and UE equipment supporting eLTE/NB-Iot/LTE-M.
  • UE and base station are connected through Uu interface.
  • the state of the UE can be divided into RRC idle state (IDLE), RRC connected state and RRC inactive state (INACTIVE).
  • RRC inactive state although the UE has no connection on the air interface, the UE's access layer context (AS context) is reserved on the base station and the UE side, and the UE is assigned an I-RNTI, which is used by the UE to restore The identity of the RRC connection.
  • This intermediate state can be considered as a connection suspend state, or it can be considered as a connection inactive (Inactive) state.
  • UE-to-Network relay is shown in Figure 1.
  • the left side is the remote UE
  • the middle is the relay UE
  • the right side is the network (also referred to as are the base station, Network, and NW);
  • scenario 3 the networks are on both sides, and the remote UE and relay UE are respectively from left to right in the middle.
  • 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.
  • the remote UE and the relay UE are connected through the PC5 (ProSe protocol 5) interface.
  • the PC5 interface is an interface for Sidelink communication between the UE and the UE on the control plane and the user plane.
  • Sidelink unicast (unicast)
  • the PC5-RRC connection is an access layer (AS layer) logical connection between a pair of source layer 2 IDs and target layer 2 IDs.
  • AS layer access layer
  • the establishment of a PC5 unicast link corresponds to the establishment of a PC5-RRC connection.
  • the PC5-RRC message refers to the message transmitted on the PC5-RRC connection, which is mainly generated and processed by the PC5 RRC layer of the UE.
  • PC5-S connection is a non-access stratum (NAS) layer logical connection between a pair of source layer 2 IDs and target layer 2 IDs, or it can be considered as a logical connection at the upper layer of sidelink communication.
  • PC5-S message also called PC5-S signaling, PC5-S signaling
  • PC5-S signaling refers to a message or signaling transmitted on the PC5 non-access layer, which is mainly generated or processed by the non-access layer of the PC5 interface.
  • SRB0 is used to bear the RRC message transmitted by the logical channel of the common control channel (CCCH);
  • CCCH common control channel
  • SRB1 is used to carry RRC messages and non-access stratum messages transmitted using a logical channel corresponding to a dedicated control channel (DCCH);
  • DCCH dedicated control channel
  • SRB2 is a Non-Access Stratum (NAS) message and an RRC message carrying measurement information for transmission using a logical channel corresponding to a dedicated control channel.
  • NAS Non-Access Stratum
  • This embodiment provides a UE processing method, which includes the following steps as shown in FIG. 3 .
  • the UE receives a message or command sent by the base station, usually, it may be an RRC reconfiguration message.
  • the message at least includes information about handing over the UE to the target relay UE, or instructs the UE to establish an indirect connection with the base station through the target relay UE.
  • the message may include at least the identifier of the target relay UE, and may also include configuration information of the PC5 and the like.
  • Step 2 when the UE receives the above message or command, it starts the switching management timer T-switch from direct to indirect and preferably, also performs the indirect connection from the direct connection with the base station to the indirect connection between the UE and the base station through the relay switching operation.
  • Such operations may include one or more of the following:
  • Suspend or suspend (suspend) SRB and/or DRB can be to suspend all signaling bearers (Radio Bear), including all SRBs and all DRBs, or suspend all SRBs except SRB1 /DRB, or suspend all SRB/DRB except SRB0 and SRB1;
  • Radio Bear including all SRBs and all DRBs, or suspend all SRBs except SRB1 /DRB, or suspend all SRB/DRB except SRB0 and SRB1;
  • Reconstructing an RLC entity entity
  • entity preferably, establishing a PC5 RLC entity for SRB or/and DRB;
  • Step 3 run on the switching management timer T-switch from direct to indirect
  • the UE sends a response message to the above message or command, such as an RRC reconfiguration complete message. Specifically, the UE may submit such a response message to a lower layer (such as the PDCP layer or the RLC layer below the RRC layer, or the MAC layer, or the physical layer) for transmission.
  • a lower layer such as the PDCP layer or the RLC layer below the RRC layer, or the MAC layer, or the physical layer
  • the handover management timer T-switch from direct to indirect of the UE stops running. Based on the foregoing operations, the UE may also determine/consider (consider) that the handover is successfully completed.
  • Step 4 as a supplement to step 3, if the UE does not send the above-mentioned corresponding response message during the operation of the switching management timer T-switch from direct to indirect, or until the switching management timer T-switch from direct to indirect Indirect running timed out (expired), UE did not send the corresponding response message, then when the handover management timer T-switch from direct to indirect running timed out, UE triggers (trigger) or initiates (initiate) RRC connection reconnection Establishment (re-establishment) process, and cell selection (cell selection) and relay UE selection (relay selection) can be performed in this process.
  • UE triggers (trigger) or initiates (initiate) RRC connection reconnection Establishment (re-establishment) process, and cell selection (cell selection) and relay UE selection (relay selection) can be performed in this process.
  • Embodiment 2 The difference between Embodiment 2 and Embodiment 1 lies in step 3.
  • Step 3 During the operation of the handover management timer T-switch from direct to indirect, if the UE receives the indication information and the indication information contains at least relevant information about the successful establishment of the PC5 connection between the UE and the target relay UE, then the UE Stop the running switch management timer T-switch from direct to indirect.
  • the UE can judge/consider (consider) that the handover is successfully completed at this time.
  • the successful establishment of the PC5 connection may refer to the establishment of the connection at the PC5 signaling layer or the establishment of the connection at the PC5 RRC layer.
  • the indication information here may come from the upper layer of the UE, that is, the PC5-S layer where the UE manages PC5 signaling, or from the V2X layer of the UE. Further, it may be a PC5 connection established between the UE and the relay UE, so that the upper layer of the UE notifies/delivers the indication information to the RRC layer of the UE.
  • the indication information here may also come from the relay UE, and the relay UE sends the indication information to the UE, confirming that the PC5 connection between the two is successfully established.
  • step three The difference between the third embodiment and the first embodiment lies in step three.
  • Step 3 the UE judges whether there is a PC5 connection with the target relay UE, and performs corresponding operations.
  • the UE determines that there is a PC5 connection with the target relay UE, and preferably, the UE further determines the quality of the reference signal reception level of the PC5 connection with the target relay UE, or the reference signal received power Reference Signal Receiving Power (RSRP), higher than or not lower than the preset threshold value, then the UE can stop running the handover management timer T-switch from direct to indirect;
  • RSRP Reference Signal Receiving Power
  • the UE determines that there is no PC5 connection with the target relay UE, then when the UE receives the indication information and the indication information contains at least information about the successful establishment of the PC5 connection between the UE and the target relay UE, the UE stops running The switching management timer T-switch from direct to indirect.
  • Embodiment 4 The difference between Embodiment 4 and Embodiment 1 lies in Step 1 and Step 2.
  • Step 1 the UE receives a message or command sent by the base station, usually, it may be an RRC reconfiguration message, and the message at least includes information about handing over the UE to the target relay UE. For example, it includes the identifier of the target relay UE, and may also include configuration information of PC5 and the like.
  • Step 2 when the UE receives the above message or command, it judges whether there is a PC5 connection with the target relay UE.
  • the UE may not start the switching management timer T-switch from direct to indirect. And optionally, the UE may determine that the handover is successfully completed at this time;
  • the UE determines that there is no PC5 connection with the target relay UE, then the UE starts a handover management timer T-switch from direct to indirect.
  • the UE may perform the operation of step 3 or step 4 in the foregoing embodiments.
  • Embodiment 5 The difference between Embodiment 5 and Embodiment 1 lies in step 3.
  • Step 3 During the operation of the handover management timer T-switch from direct to indirect, the UE sends a response message to the above message or command, such as an RRC reconfiguration complete message. Specifically, the UE may submit such a response message to the lower layer for transmission.
  • a response message to the above message or command, such as an RRC reconfiguration complete message.
  • the UE may submit such a response message to the lower layer for transmission.
  • the UE When the UE receives the response information to the above response message, the UE stops running the handover management timer T-switch from direct to indirect. And optionally, the UE may determine that the handover is completed successfully.
  • the "response information to the above response message” can be one of the following situations:
  • the UE After sending the above response message, the UE receives a PC5RRC message sent from the target relay UE, such as a PC5RRC configuration message, to reconfigure the PC5 interface communication of the UE; or a PC5-S message sent from the target relay UE.
  • a PC5RRC message sent from the target relay UE such as a PC5RRC configuration message, to reconfigure the PC5 interface communication of the UE; or a PC5-S message sent from the target relay UE.
  • the UE After sending the above response message, the UE receives an RRC reconfiguration message from the base station, preferably, it is the first RRC reconfiguration message received by the UE after sending the response message;
  • the UE After sending the above response message, the UE receives confirmation information (acknowledge, ACK) from the lower layer, confirming that the above response message has been sent successfully;
  • confirmation information acknowledge, ACK
  • the UE After sending the above response message, the UE receives the acknowledgment information (acknowledge, ACK) sent by the target relay UE, and confirms that the above response message has been sent successfully.
  • This confirmation information can be carried in the MAC CE or in the SCI.
  • the UE when the UE can determine/deem that the handover is successfully completed, or when the UE can determine/deem that the handover is successfully completed, the UE can restore the suspended or suspended SRB or DRB, such as SRB2 and all The DRB, and optionally, resumes the SRB or the transmission of the DRB, such as the transmission of SRB2 and all DRBs.
  • the suspended or suspended SRB or DRB such as SRB2 and all The DRB
  • Fig. 4 is a brief structural block diagram of the user equipment involved in the present invention.
  • the user equipment 400 includes at least a processor 401 and a memory 402 .
  • the processor 401 may include, for example, a microprocessor, a microcontroller, an embedded processor, and the like.
  • the memory 402 may include, for example, a volatile memory (such as random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memory systems.
  • Memory 402 has program instructions stored thereon. When the instruction is executed by the processor 401, the above method described in detail in the present disclosure and executed by the user equipment may be executed.
  • the user equipment shown above may include more modules, for example, may also include modules that can be developed or developed in the future and can be used for the base station, MME, or UE, and the like.
  • the various identifiers shown above are only exemplary rather than restrictive, and the present disclosure is not limited to specific information elements as examples of these identifiers. Numerous variations and modifications may be made by those skilled in the art in light of the teachings of the illustrated embodiments.
  • various components inside the base station and user equipment in the above embodiments can be implemented by various devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processing Devices, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (CPLDs), etc.
  • DSP digital signal processing
  • ASICs Application Specific Integrated Circuits
  • FPGAs Field Programmable Gate Arrays
  • CPLDs Programmable Logic Devices
  • 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包括如下步骤：用户设备UE接收从基站发送的消息或者命令，其中，该消息是RRC重配置消息，在该消息中至少包含了将UE切换到目标中继UE的相关信息，或者是指示UE通过目标中继UE建立与基站的非直接连接的信息，或者是目标中继UE的标识，或者是PC5的配置信息；在接收到上述消息或命令时，UE基于上述消息或命令执行从与基站的直接连接到通过中继UE与基站的非直接连接的切换。

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及用户设备。
背景技术
在一个基站覆盖的小区内，一个用户设备UE可以与基站直接进行通信，这样的通信连接被称为直接连接(directconnection)。这个UE还可以通过一个中继UE(relay UE)和基站进行通讯连接，这种连接可以被称为非直接连接(indirectconnection)。在通过relay UE和基站进行通信的场景下，这个UE被称为远端UE(remote UE)。
为了保证通信业务的连续性，与基站直接连接的UE可以在基站的指示下，切换(switch/handover)到一个relay UE上，从而实现与基站的非直接连接。
在上述情况下，UE如何管理从直接连接到非直接连接的切换(switch/handover from direct to indirect connection)过程是需要解决的。
发明内容
为了解决上述问题，本发明提供一种由用户设备执行的方法以及用户设备。
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，包括如下步骤：
用户设备UE接收从基站发送的消息或者命令，其中，该消息是RRC重配置消息，在该消息中至少包含了将UE切换到目标中继UE的相关信息，或者是指示UE通过目标中继UE建立与基站的非直接连接的信息，或者是目标中继UE的标识，或者是PC5的配置信息；
在接收到上述消息或命令时，UE基于上述消息或命令执行从与基 站的直接连接到通过中继UE与基站的非直接连接的切换。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
在接收到上述消息或命令时，UE启动切换管理定时器。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
如果在上述切换管理定时器的运行期间UE发送了对上述消息或命令的响应消息，那么UE停止运行的切换管理定时器；
如果在上述切换管理定时器的运行期间UE未发送对上述消息或命令的响应消息，那么当切换管理定时器运行超时时，UE触发或者启动RRC连接重建立过程，并在这一过程中进行小区选择以及中继UE选择。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
如果在上述切换管理定时器运行期间UE接收到指示信息且指示信息至少包含了UE与上述目标中继UE之间的PC5连接成功建立的相关信息，那么UE停止运行的切换管理定时器。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
如果UE判定与上述目标中继UE之间存在PC5连接，那么UE停止运行的切换管理定时器；
如果UE判定与上述目标中继UE之间不存在PC5连接，那么当UE接收到指示信息且指示信息至少包含了UE与上述目标中继UE之间的PC5连接成功建立的相关信息时，UE停止运行的切换管理定时器。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
在接收到上述消息或命令时，UE判定与上述目标中继UE之间是否有PC5连接。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
如果UE判定与上述目标中继UE之间存在PC5连接，那么UE不启动切换管理定时器；
如果UE判定与上述目标中继UE之间不存在PC5连接，那么UE启动切换管理定时器。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
如果在上述切换管理定时器的运行期间UE发送了对上述消息或命令的响应消息，那么UE停止运行的切换管理定时器；
如果在上述切换管理定时器的运行期间UE未发送对上述消息或命令的响应消息，那么当切换管理定时器运行超时时，UE触发或者启动RRC连接重建立过程，并在这一过程中进行小区选择以及中继UE选择。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
当UE接收到对上述响应消息的响应信息时，UE停止运行的切换管理定时器，
其中，对上述响应消息的响应信息是：
在发送上述响应消息之后UE接收到的来自目标中继UE发送的PC5RRC消息或者PC5-S消息；
在发送上述响应消息之后UE接收到的来自基站的RRC重配置消息；
在发送上述响应消息之后UE接收到的来自下层的确认信息ACK；或者
在发送上述响应消息之后UE接收到的来目标中继UE发送的确认信息ACK。
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根据上文所描述的方法。
根据本发明所涉及的由用户设备执行的方法以及相应的用户设备，UE能够有效地管理从直接连接到非直接连接的切换过程。
附图说明
图1是表示UE-to-Network中继的示意图。
图2是表示UE-to-Network中继架构接口的示意图。
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
eLTEEnhaced 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)
RLCRadio Link Control，无线链路层控制(层)
PDCP     Packet Data Convergence Protocol 分组数据汇聚协议(层)
MAC CE MAC Control Element MAC控制元素
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
SL：Sidelink，侧行通信
ProSe Proximity-based services 基于近场通信的服务
SCI Sidelink Control Information 侧行通信控制信息
SRB Signaling radio bearer 信令无线承载
DRB Data radio bearer 数据无线承载
V2X Vehicle to X 车联通信
CCCH Common Control Channel 公共控制信道
DCCH Dedicated Control Channel 专有控制信道
NAS    Non-Access Stratum 非接入层
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。
在NR接入技术中，UE和基站通过Uu接口进行连接。根据UE在Uu口的连接状态，UE的状态可以分为RRC空闲态(IDLE)、RRC连接态以及RRC非激活态(INACTIVE)。在RRC非激活态下，UE虽然在空口上无连接，但是UE的接入层上下文(AS context)被保留在基站和UE侧，并且UE被分配了I-RNTI，该标识是UE用来恢复RRC连接的身份标识。这种中间态可以认为是一种连接暂停(suspend)的状态，又或者可以认为是连接非激活(Inactive)状态。
UE-to-Network中继如图1所示，场景1(A)和场景2(B)中，左侧为远端UE，中间为中继UE，右侧为网络(在本说明书中也称为基站、Network、NW)；场景3(C)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。
对于UE-to-Network的中继架构接口如图2所示，远端UE和中继UE通过PC5(ProSe protocol 5)接口相连。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(unicast)，PC5-RRC连接是一对源层二ID和目标层二ID之间的接入层(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。PC5-RRC消息是指在PC5-RRC连接上传递的消息，主要是由UE的PC5RRC层生成以及处理。PC5-S连接是一对源层二ID和目标层二ID之间的非接入层(NAS)层逻辑连接，或者可以认为是sidelink通信高层的逻辑连接。PC5-S消息(又可以称为PC5-S信令，PC5-S signaling)是指在PC5非接入层上传递的消息或者信令，主要是由PC5接口的非接入层生成或者处理。
信令承载SRB
SRB0用于承载采用公共控制信道(CCCH)的逻辑信道传输的RRC消息；
SRB1是用于承载采用专有控制信道(DCCH)对应的逻辑信道进行传输的RRC消息和非接入层消息；
SRB2是采用专有控制信道对应的逻辑信道进行传输的非接入层(NAS)消息以及携带测量信息的RRC消息。
实施例一
本实施例给出了一种UE的处理方法，如图3所示包括如下步骤。
步骤一(S301)，UE接收基站发送的消息或者命令，通常，可以是RRC重配置消息。在该消息中至少包含了将UE切换到目标relay UE的相关信息，或者是指示UE通过目标relay UE建立与基站的非直接连接的信息。在该消息中可以至少包含目标relay UE的标识，还可以包含了PC5的配置信息等。
步骤二(S302)，UE接收到上述消息或命令时，启动切换管理定时器T-switch from direct to indirect以及优选地，还执行从与基站的直接连接到通过中继UE与基站的非直接连接的切换操作。这样的操作可以包括下述操作之一或者多：
应用(apply)上述消息或者命令中包含的配置信息(configurations)；
暂停或者挂起(suspend)SRB和/或DRB，优选地，可以是挂起所有的信令承载(Radio Bear)，包括所有的SRB和所有的DRB，或者是挂起除了SRB1之以外的所有SRB/DRB，又或者是挂起除了SRB0以及SRB1之外所有的SRB/DRB；
重建PDCP实体(entity)；
重建RLC实体(entity)，优选地，为SRB或者/和DRB建立PC5RLC实体；
停止与基站的数据传输；
建立与目标中继UE之间的PC5连接等等。
步骤三，在切换管理定时器T-switch from direct to indirect运行
(running)期间，UE发送针对上述消息或命令的响应消息，例如RRC重配置完成消息。具体可以是UE将这样的响应消息递交给下层(例如RRC层之下的PDCP层或者RLC层，还可以是MAC层，或者物理层)进行传输。与此同时，UE停止运行的切换管理定时器T-switch from direct to indirect。基于前述操作，UE还可以判定/认为(consider)切换成功完成。
步骤四，作为步骤三的补充，如果在切换管理定时器T-switch from direct to indirect运行期间UE没有发送所述的、对应的响应消息，或者是一直到切换管理定时器T-switch from direct to indirect运行超时(expired)，UE都没有发送所述的、对应的响应消息，那么当切换管理定时器T-switch from direct to indirect运行超时时，UE触发(trigger)或者启动(initiate)RRC连接重建立(re-establishment)过程，并在这一过程中可以进行小区选择(cellselection)以及中继UE选择(relayselection)。
实施例二
实施例二和实施例一的区别在于步骤三。
步骤三，在切换管理定时器T-switch from direct to indirect运行期间，如果UE接收到指示信息且指示信息至少包含了UE与所述目标relay UE之间的PC5连接成功建立的相关信息，那么UE停止运行的切换管理定时器T-switch from direct to indirect。UE可以在这个时候判定/认为(consider)切换成功完成。优选的，PC5连接成功建立可以是指PC5信令层的连接建立或者是PC5RRC层的连接建立。
这里的指示信息可以来自UE的上层，即UE管理PC5信令的PC5-S层，或者来自UE的V2X层。进一步地，可以是UE与relay UE之间建立的PC5连接，从而UE的上层通知/传递给UE的RRC层该指示信息。
这里的指示信息还可以来自于relay UE，relay UE向该UE发送了指示信息，确认了两者之间PC5连接成功建立。
实施例三
实施例三和实施例一的区别在于步骤三。
步骤三，UE判断与所述目标relay UE之间是否有PC5连接，以及执行对应的操作。
如果UE判定与所述目标relay UE之间存在PC5连接，以及优选的，UE进一步判定与所述目标relayUE之间存在的PC5连接的参考信号接收电平质量，或者是参考信号接收功率Reference Signal Receiving Power(RSRP)，高于或者不低于预先设定的门限值，那么UE可以停止运行的切换管理定时器T-switch from direct to indirect；
如果UE判定与所述目标relay UE之间不存在PC5连接，那么当UE接收到指示信息且指示信息至少包含了UE与所述目标relay UE之间的PC5连接成功建立的相关信息，UE停止运行的切换管理定时器T-switch from direct to indirect。
实施例四
实施例四和实施例一的区别在于步骤一以及步骤二。
步骤一，UE接收基站发送的消息或者命令，通常，可以是RRC重配置消息，在该消息中至少包含了将UE切换到目标relay UE的相关信息。例如，包含了所述目标relay UE的标识，还可以包含了PC5的配置信息等。
步骤二，UE接收到上述消息或命令时，判断与目标relay UE之间是否有PC5连接。
如果UE判定与所述目标relay UE之间存在PC5连接，那么UE可以不启动切换管理定时器T-switch from direct to indirect。以及可选的，UE在此时可以判定切换成功完成；
如果UE判定与所述目标relay UE之间不存在PC5连接，那么UE启动切换管理定时器T-switch from direct to indirect。
相应地，在切换管理定时器T-switch from direct to indirect运行期间，UE可以执行前述实施例中步骤三或者步骤四的操作。
实施例五
实施例五和实施例一的区别在于步骤三。
步骤三，在切换管理定时器T-switch from direct to indirect运行期间，UE发送对上述消息或命令的响应消息，例如RRC重配置完成消息。具体可以是UE将这样的响应消息递交给下层进行传输。
当UE接收到对上述响应消息的响应信息时，UE停止运行的切换管理定时器T-switch from direct to indirect。以及可选的，UE可以判断切换成功完成。
这里“对上述响应消息的响应信息”可以是下述情况之一：
在发送上述响应消息之后，UE接收到来自目标relay UE发送的PC5RRC消息，例如PC5RRC配置消息，对UE的PC5接口通信进行了重配置；或者是来自目标relay UE发送的PC5-S消息。
在发送上述响应消息之后，UE接收到了来自基站的RRC重配置消息，优选的，是在发送响应消息之后UE接收到的第一条RRC重配置消息；
在发送上述响应消息之后，UE接收到来自下层的确认信息(acknowledge，ACK)，确认上述响应消息已经发送成功；
在发送上述响应消息之后，UE接收到来目标relay UE发送的确认信息(acknowledge，ACK)，确认上述响应消息已经发送成功。这种确认信息可以是携带在MAC CE中，或者是携带在SCI中。
实施例六
基于前述实施例，当UE可以判定/认为切换成功完成时，或者是UE在可以判/认为定切换成功完成的时刻，UE可以恢复被暂停或者被挂起的SRB或者DRB，例如SRB2和所有的DRB，以及可选的，恢复SRB或者DRB的传输，例如SRB2和所有的DRB的传输。
图4是本发明所涉及的用户设备的简要结构框图。
如图4所示，该用户设备400至少包括处理器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)、或其他存储器系统等。存储器402上存储有程序指令。该指令在由处理器401运行时，可以执行本公开的详细描述的由用户设备执行的上述方法。
上文已经结合优选实施例对本公开的方法和涉及的设备进行了描述。本领域技术人员可以理解，上面示出的方法仅是示例性的，而且以上说明的各实施例在不发生矛盾的情况下能够相互组合。本发明的方法并不局限于上面示出的步骤和顺序。
上面示出的用户设备可以包括更多的模块，例如还可以包括可以开发的或者将来开发的可用于基站、MME、或UE的模块等等。上文中示出的各种标识仅是示例性的而不是限制性的，本公开并不局限于作为这些标识的示例的具体信元。本领域技术人员根据所示实施例的教导可以进行许多变化和修改。
应该理解，本公开的上述实施例可以通过软件、硬件或者软件和硬件两者的结合来实现。例如，上述实施例中的基站和用户设备内部的各种组件可以通过多种器件来实现，这些器件包括但不限于：模拟电路器件、数字电路器件、数字信号处理(DSP)电路、可编程处理器、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、可编程逻辑器件(CPLD)，等等。
此外，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没备，如AV没备、厨房设备、清洁设备、空调、办公没备、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 (2)

  1. 一种由用户设备执行的方法，包括如下步骤：
    用户设备UE接收从基站发送的消息或者命令，其中，该消息是RRC重配置消息，在该消息中至少包含了将UE切换到目标中继UE的相关信息，或者是指示UE通过目标中继UE建立与基站的非直接连接的信息，或者是目标中继UE的标识，或者是PC5的配置信息；
    在接收到上述消息或命令时，UE启动切换管理定时器，建立与目标中继UE之间的PC5连接，以及将RRC重配置完成消息递交给下层进行传输；
    在发送上述RRC重配置完成消息之后，当UE接收到来自目标中继UE的确认信息ACK时，停止切换管理定时器，当切换管理定时器运行超时时，UE触发或者启动RRC连接重建立过程。
  2. 一种用户设备，包括：
    处理器；以及
    存储器，存储有指令，
    其中，上述指令在由上述处理器运行时执行根据权利要求1所述的方法。
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