WO2023093818A1 - Procédé exécuté par un équipement utilisateur, et équipement utilisateur - Google Patents

Procédé exécuté par un équipement utilisateur, et équipement utilisateur Download PDF

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Publication number
WO2023093818A1
WO2023093818A1 PCT/CN2022/134184 CN2022134184W WO2023093818A1 WO 2023093818 A1 WO2023093818 A1 WO 2023093818A1 CN 2022134184 W CN2022134184 W CN 2022134184W WO 2023093818 A1 WO2023093818 A1 WO 2023093818A1
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WO
WIPO (PCT)
Prior art keywords
user equipment
relay
rrc connection
configuration
method performed
Prior art date
Application number
PCT/CN2022/134184
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English (en)
Chinese (zh)
Inventor
张崇铭
刘仁茂
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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
Publication of WO2023093818A1 publication Critical patent/WO2023093818A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • 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
    • 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 user equipment and corresponding 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 indirectly connected to the base station through the relay UE can perform handover (switch/handover) under the instruction of the base station, so as to realize the direct connection with the base station.
  • handover can be called indirect Connect to Direct Connect toggle.
  • the UE may fail in the process of handover from indirect connection to direct connection. For example, the timer T304 for managing the handover runs out, indicating that this handover fails. Then the UE will restore the original configuration and perform the RRC connection re-establishment process. During the connection re-establishment process, the UE can perform cell reselection and relay reselection.
  • the UE experiencing the above-mentioned handover failure selects a cell to initiate an RRC connection re-establishment process.
  • the UE runs out of T304, it restores the original configuration. Since the original configuration is suitable for the scenario where the UE is indirectly connected to the base station through the relay, then when the UE reselects a cell and needs to directly connect to the base station , the original configuration cannot be used, which leads to the failure of re-establishment. This is a problem that needs to be solved.
  • the present invention provides a method executed by user equipment capable of avoiding re-establishment failure and user equipment.
  • a method performed by a user equipment is provided, which is a method performed by the user equipment UE in the RRC connection state after establishing an RRC connection with the base station through the relay UE, including the following steps:
  • the UE receives an RRC connection reconfiguration message from the base station, and the reconfiguration message indicates that the UE performs synchronous reconfiguration;
  • the UE When the UE receives the RRC connection reconfiguration message, it starts a timer T304 for managing handover or synchronous reconfiguration;
  • the UE restores the original configuration, that is, the configuration used before receiving the above-mentioned reconfiguration message, and starts the RRC connection re-establishment process, wherein the original configuration restored by the UE does not include the relevant configuration of PC5 .
  • the above reconfiguration message instructs the UE to switch from an indirect connection via a relay to a direct connection via a cell.
  • the above original configuration is the configuration received by the UE from the base station side under the indirect connection via the relay.
  • the UE judges whether it is in an indirect connection via a relay before,
  • the UE restores the original configuration except the related configuration of PC5 above, and starts the RRC connection re-establishment procedure.
  • the foregoing reconfiguration message indicates information that the UE is synchronized to a cell.
  • the original configuration above is the configuration of the source cell.
  • the UE restores the configuration used in the source cell and starts the RRC connection re-establishment process.
  • the UE if the UE is not connected to the relay UE, then the UE releases the existing configuration related to PC5.
  • the UE if the UE is not connected to the relay UE, then the UE further determines the reason for triggering the RRC connection re-establishment.
  • 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.
  • FIG. 1 is a schematic diagram showing UE-to-Network relay.
  • Fig. 2 is a schematic diagram showing the control plane protocol stack of UE-to-Network L2 architecture.
  • Fig. 3 shows a method executed by a user equipment UE according to an embodiment of the present invention.
  • Fig. 4 is a brief structural block diagram of the user equipment UE involved in the present invention.
  • 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 network
  • SCI Sidelink Control Information, side link 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 link 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
  • PDU Protocol Data Unit Protocol Data Unit
  • SDU Service Data Unit service data unit
  • V2X Vehicle-to-Everything Internet of Vehicles
  • CCCH Common Control Channel public control channel
  • DCCH Dedicated Control Channel dedicated control channel
  • 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.
  • sidelink and PC5 can be used interchangeably, and RLC channel (channel), RLC entity and RLC bearer (bearer) can be used interchangeably.
  • RLC channel channel
  • RLC entity RLC entity
  • RLC bearer be used interchangeably.
  • PC5 is used for relay operation, so it can also be replaced by relay.
  • 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.
  • the remote UE-to-Network relay is shown in Figure 1.
  • the remote UE is on the left, the relay UE is in the middle, and the network is on the right; in scenario 3, the networks are on both sides, and the middle is from the left To the right are the remote UE and the relay UE.
  • the remote UE is connected to the relay UE through the PC5 interface, and 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 After the Remote UE selects a relay UE to provide relay services for itself, it will establish a PC5-RRC connection with the relay UE to communicate with the network through the relay UE.
  • the remote UE can establish an air interface RRC connection with the network through the relay UE for data transmission between the remote UE and the network.
  • the Remote UE will send the air interface RRC connection setup (setup), re-establishment (re-establish), and resume (resume) messages to the network to encapsulate the data through the Uu PDCP layer, and then submit it to the PC5 RLC entity for further encapsulation, and carry it on the PC5 RLC On the channel, it is submitted layer by layer through PC5-MAC and PC5-PHY.
  • the relay UE After the relay UE receives the data carrying the message, it submits it layer by layer through the PC5-PHY and PC5-MAC.
  • the relay UE finds the Uu RLC channel carrying the message through the mapping relationship between the PC5 RLC channel and the Uu RLC channel, and sends the Messages are encapsulated in Uu messages/data and sent to the network.
  • the base station encapsulates the RRC message returned by the network into the Uu message/data and sends it to the relay UE.
  • the relay UE finds the PC5 RLC channel carrying the message through the mapping relationship between the PC5 RLC channel and the Uu RLC channel, and transmits the message Encapsulated in PC5 message/data and sent to remote UE.
  • Uu RLC/MAC and PC5 RLC/MAC When the Remote UE initiates RRC connection establishment, re-establishment, and recovery processes to the network, Uu RLC/MAC and PC5 RLC/MAC also need to perform corresponding processing in order to correctly transmit data when needed and stop data transmission in time when not needed. Conversely, the network can also release and suspend the air interface RRC connection to the remote UE through the relay UE. In these processes, Uu RLC/MAC and PC5 RLC/MAC also need to be processed accordingly.
  • the UE sends an RRC connection establishment request message, an RRC connection re-establishment request message, and an RRC connection recovery request message to the base station through SRBO.
  • SRB0 is used to bear RRC messages transmitted by using a logical channel whose logical channel type is CCCH (SRB0 is for RRC messages using the CCCH logical channel).
  • SRB0 is for RRC messages using the CCCH logical channel.
  • the RRC connection establishment request message, the RRC connection re-establishment request message, and the RRC connection recovery request message all belong to such RRC messages transmitted using a logical channel whose logical channel type is CCCH.
  • the RRC message transmitted on SRB0 may be referred to as SRB0 message (SRB0 message) for short.
  • the UE sends an RRC connection recovery request message to the base station through SRBO.
  • the base station may send an RRC connection recovery message to the UE through SRB1.
  • the UE sends an RRC re-establishment request message to the base station through SRB0.
  • the base station may send an RRC re-establishment message to the UE through SRB1.
  • SRB1 is used to carry RRC messages transmitted using a logical channel whose logical channel type is DCCH (SRB1 is for RRC messages using the DCCH logical channel).
  • both the RRC connection recovery message and the RRC connection re-establishment message belong to such RRC messages transmitted using a logical channel whose logical channel type is CCCH.
  • the RRC message transmitted on SRB1 may be referred to as SRB1 message (SRB1 message) for short.
  • the wireless communication interface between Remote UE and relay UE The remote UE and the relay UE communicate through a sidelink (sidelink), and the communication interface of the sidelink communication is the PC5 interface, so the descriptions of sidelink and PC5 in this article can be replaced with each other.
  • sidelink sidelink
  • PC5 interface the communication interface of the sidelink communication
  • the PC5 RLC entity refers to the RLC entity used for PC5 interface communication.
  • the PC5 RLC entity carries information from the Uu PDCP entity, so such a PC5 RLC entity can also be called a PC5 RLC bearer (bearer).
  • UE can use E-UTRAN to communicate with eNB on Uu interface.
  • UE can also use NR to communicate with gNB on Uu interface.
  • the Uu RLC entity refers to the RLC entity used for Uu interface communication.
  • both the PC5 RLC entity and the Uu RCL entity refer to the RLC entity that complies with the RLC protocol stack, but the communication interfaces used by the two are different.
  • the UE when the UE receives the RRC connection reconfiguration message from the base station, when the message indicates that the UE performs reconfiguration with sync, or handover (handover/switch), the UE will start the timer T304 is used to manage the synchronization process. If the synchronous reconfiguration is successfully completed, the UE will stop T304; if the T304 runs overtime, it means that the synchronous reconfiguration process has failed, and the UE will trigger the RRC connection re-establishment process. During this process, the UE sends an RRC re-establishment request to the base station Message (RRCReestablishmentRequest message).
  • RRCReestablishmentRequest message the base station Message
  • T304 is taken as an example, but it is not limited to this timer, and may also be other timers for managing handover or synchronous reconfiguration.
  • This embodiment provides a method performed by a user equipment UE, as shown in FIG. 3 , the method includes the following steps.
  • Step S301 The UE receives an RRC message from the base station, such as an RRC connection reconfiguration message, in which the UE is instructed to execute a reconfiguration with sync.
  • the UE is a remote UE before receiving the configuration message, it is connected to the relay UE, and has established an RRC connection with the base station through the relay UE, and is in an RRC connection state.
  • the reconfiguration message instructs the UE to switch from the current indirect connection via the relay to the direct connection via the cell, or instructs the remote UE to perform a path switch (path switch) to the target cell.
  • the message indicating synchronous reconfiguration does not contain the relevant configuration or information element (information element, IE) instructing the UE to perform path handover to the target relay UE, thus implicitly instructing the remote UE to handover to the target cell.
  • IE information element
  • Step S302 When receiving the above reconfiguration message, the UE starts the timer T304, and optionally, starts synchronizing with the downlink of the target cell (start synchronizing to the DL of the target Cell).
  • Step S303 When T304 expires (T304expiry), the UE restores (revert back) the original configuration (ie the configuration used before receiving the above reconfiguration message), and starts the RRC connection re-establishment process.
  • the "original configuration” here may refer to the configuration of the UE in the source cell (source cell), or the configuration received by the UE under the indirect connection and from the base station side.
  • the original configuration restored by the UE does not include (excluding) the configuration related to PC5, such as the configuration of PC5 RLC bearer, or/and the configuration of PC5 MAC, or/and the configuration of PC5 physical layer wait.
  • configurations related to relay operations are not included.
  • T304 runs overtime (T304 expiry)
  • the UE judges whether it is directly connected or not directly connected before:
  • the UE restores (revert back) the original configuration and starts the RRC connection re-establishment process;
  • the UE restores (revert back) the original configuration except the above-mentioned PC5-related configuration (or does not restore the above-mentioned PC5-related configuration), and starts RRC connection re-establishment process.
  • UE is not in direct connection
  • UE is connected to relay UE
  • UE is not in direct connection
  • UE is not connected to relay UE
  • UE is either in direct connection or It is in an indirect connection, so it can be seen that if the UE is not in an indirect connection, then the UE is in a direct connection.
  • the UE receives an RRC message from the base station, such as an RRC connection reconfiguration message, and the message is as described in Embodiment 1.
  • the UE When receiving the above reconfiguration message, the UE starts the timer T304.
  • UE restores (revert back) the configuration used in the source cell (or restores the original configuration, that is, the configuration used before receiving the above reconfiguration message), and starts the RRC connection re-establishment process .
  • the UE can perform cell selection or relay selection. If the UE is not connected to the relay UE, or the UE is directly connected, it indicates that the UE has reselected a cell and reselected a suitable cell. Then the UE can release the existing or restored PC5-related configurations, such as releasing (release) PC5 RLC bearer, PC5 MAC entity, PC5 physical layer configuration, etc.; or discard (discard) the configuration associated with the sidelink relay operation, Or discard the configuration associated with sidelink communication (discard sidelink communication related configuration).
  • PC5-related configurations such as releasing (release) PC5 RLC bearer, PC5 MAC entity, PC5 physical layer configuration, etc.
  • discard (discard) the configuration associated with the sidelink relay operation or discard the configuration associated with sidelink communication (discard sidelink communication related configuration).
  • the UE can also establish or re-establish the Uu RLC entity for SRB1, and can also apply (apply) the default configuration for SRB1 (apply the default configuration for SRB1), and then restore SRB1 (resume SRB1), and reconnect the RRC connection
  • the establishment request is submitted to the lower layer for transmission.
  • the UE can perform cell selection or relay selection. If the UE is not connected to the relay UE, or the UE is directly connected, it indicates that the UE has performed cell selection and has selected a suitable cell (suitable cell). Then the UE further judges the reason for triggering RRC connection reestablishment.
  • the UE releases the existing or configured PC5-related configuration, such as releasing (release) PC5 RLC bearer, PC5MAC entity, PC5 physical layer configuration, etc., or discard the configuration associated with the sidelink relay operation, or discard the configuration associated with the sidelink communication.
  • the UE can also establish or re-establish the Uu RLC entity for SRB1, and can also apply the default configuration of SRB1 (apply the default configuration for SRB1), then resume SRB1 (resume SRB1), and submit the RRC re-establishment request message to the lower layer for transmission.
  • the UE can apply the default configuration of SL-RLC for SRB1 (apply the default configuration of SL-RLC for SRB1), then resume SRB1 (resume SRB1), and submit the RRC re-establishment request message to the lower layer for transmission.
  • Fig. 4 is a brief structural block diagram of the user equipment UE 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, and the like.
  • the memory 402 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a nonvolatile memory (such as a flash memory), or other memories.
  • 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 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé exécuté par un équipement utilisateur (UE) et un UE. Le procédé est exécuté lorsque l'UE établit une connexion RRC avec une station de base au moyen d'un UE relais pour être dans un état connecté RRC, et comprend les étapes suivantes : l'UE reçoit un message de reconfiguration de connexion RRC de la station de base, le message de reconfiguration indiquant que l'UE exécute une reconfiguration de synchronisation ; lorsque l'UE reçoit le message de reconfiguration de connexion RRC, l'UE démarre un temporisateur T304 pour gérer un transfert ou une reconfiguration de synchronisation ; et lorsque le temporisateur T304 expire, l'UE restaure une configuration d'origine, c'est-à-dire une configuration utilisée avant que le message de reconfiguration ne soit reçu, puis lance un processus de rétablissement de connexion RRC, la configuration d'origine restaurée par l'UE ne comprenant pas de configuration associée de PC5.
PCT/CN2022/134184 2021-11-25 2022-11-24 Procédé exécuté par un équipement utilisateur, et équipement utilisateur WO2023093818A1 (fr)

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CN202111417415.5 2021-11-25

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