WO2023130368A1 - 收发信息的方法、装置和通信系统 - Google Patents

收发信息的方法、装置和通信系统 Download PDF

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Publication number
WO2023130368A1
WO2023130368A1 PCT/CN2022/070786 CN2022070786W WO2023130368A1 WO 2023130368 A1 WO2023130368 A1 WO 2023130368A1 CN 2022070786 W CN2022070786 W CN 2022070786W WO 2023130368 A1 WO2023130368 A1 WO 2023130368A1
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Prior art keywords
terminal device
radio resource
resource control
relay
information
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PCT/CN2022/070786
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English (en)
French (fr)
Inventor
李国荣
贾美艺
王昕�
张磊
Original Assignee
富士通株式会社
李国荣
贾美艺
王昕�
张磊
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Application filed by 富士通株式会社, 李国荣, 贾美艺, 王昕�, 张磊 filed Critical 富士通株式会社
Priority to PCT/CN2022/070786 priority Critical patent/WO2023130368A1/zh
Publication of WO2023130368A1 publication Critical patent/WO2023130368A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update

Definitions

  • the embodiment of the present application relates to the technical field of communications.
  • 5G version 17 (Release 17, R17) is studying side link relay (Sidelink relay, SL relay) technology, which includes the scenario of terminal equipment (for example, UE) to network equipment relay (UE-to-Network Relay) .
  • UE terminal equipment
  • UE-to-Network Relay network equipment relay
  • the new air interface (NR) Uu link is used on the Uu interface of the relay terminal equipment (relay UE), and the NR sidelink chain is assumed to be used on the PC5 interface between the remote terminal equipment (remote UE) and the relay UE road.
  • the relay UE is also called UE-to-Network relay UE.
  • Fig. 1 is a schematic diagram of a scenario of relaying from a terminal device to a network device.
  • the remote UE 101 is outside the coverage of the network device 100 (out of coverage, OOC), and the relay UE 102 is within the coverage of the network device 100 (in coverage, IC).
  • the remote UE 101 is within the coverage of the network device 100 (in coverage, IC)
  • the relay UE 102 is within the coverage of the network device 100 (in coverage, IC).
  • the remote UE 101 is within the coverage (in coverage, IC) of the network device 100a
  • the relay UE 102 is within the coverage (in coverage, IC) of the network device 100
  • the network device 100a different from the network device 100.
  • the side link relay adaptation protocol (SRAP, Sidelink Relay Adaptation Protocol) is introduced.
  • SRAP Sidelink Relay Adaptation Protocol
  • the SRAP sublayer is located above the radio link control (RLC) sublayer.
  • SDAP Uu Service Data Adaptation Protocol
  • PDCP Packet Data Convergence Protocol
  • RRC Radio Resource Control
  • SRAP SRAP
  • RLC RLC
  • MAC Media Access Control
  • PHY Physical
  • Figure 2 is a schematic diagram of the control plane protocol stack of UE-to-Network relay.
  • the SRAP sublayer on the PC5 interface is only used for bearer mapping purposes.
  • the SRAP sublayer does not appear in the PC5 hop.
  • the SRAP sublayer does not appear on the PC5hop, but the SRAP sublayer appears on the Uu hop for the downlink (DL) and uplink (UL).
  • a terminal device for example, UE can directly communicate with a network device (for example, Network or gNB), and this communication path can be called a direct path (direct path).
  • the terminal device can also communicate with the network device through the relay UE, and this communication path can be called an indirect path (indirect path).
  • the flow shown in Figure 3 can be used for service continuity of L2 UE-to-Network relay, in the case of UE switching from direct path to indirect path (ie, direct to indirect path switch), the flow shown in Figure 3 can be used.
  • the process of handing over the UE from the direct path to the indirect path includes the following steps:
  • Step 1 The uplink data and/or downlink data (UL/DL data) are transmitted between the remote UE and the network device (for example, gNB) through the Uu interface.
  • the network device for example, gNB
  • Step 1 After the remote UE measures and/or discovers a candidate relay UE, it reports one or more candidate relay UEs and traditional Uu measurement results.
  • the remote UE may at least report the relay UE ID, the serving cell ID of the relay UE, and the SL measurement information, wherein the SL measurement information may be the sidelink reference signal received power (sidelink-reference signal received power, SL-RSRP) of the candidate relay UE, if If SL-RSRP is not available, use sidelink discovery-reference signal received power (sidelink discovery-reference signal received power, SD-RSRP).
  • SL-RSRP sidelink-reference signal received power
  • SD-RSRP sidelink discovery-reference signal received power
  • Step 2a The gNB decides to handover the remote UE to the target relay UE.
  • Step 2b The gNB sends a radio resource control reconfiguration (RRCReconfiguration) message to the target relay UE.
  • the message may at least include the remote UE's local identifier (local/temp ID) and layer 2 identifier (L2ID), Uu and PC5 interfaces for Relay RLC configuration and bearer mapping configuration.
  • Step 3 gNB sends RRCReconfiguration message to remote UE.
  • the content of the message may at least include the Relay UE ID, the PC5RLC configuration of the relay service and the related end-to-end radio bearer (radio bearer).
  • the Remote UE stops the user plane (user plane, UP) and control plane (control plane, CP) transmission after receiving the RRCReconfiguration message from the gNB.
  • Step 4 The remote UE establishes a PC5 connection with the target relay UE.
  • Step 5 The remote UE sends a radio resource control reconfiguration complete (RRCReconfigurationComplete) message to the gNB via the relay UE to complete the path switch process.
  • RRCReconfigurationComplete radio resource control reconfiguration complete
  • Step 6 Between Remote UE and gNB, the data path is switched from direct path to indirect path.
  • the relay UE may be in RRC_idle mode, RRC_inactive mode or RRC_connected mode.
  • the following options may be available for processing the case where the relay UE is in the radio resource control idle (RRC_idle) mode or the radio resource control inactive (RRC_inactive) mode:
  • the target relay UE of direct-to-indirect path switch must be in RRC_connected mode.
  • the relay UE in RRC_idle or RRC_inactive mode can be indicated as the target relay, and this situation is supported through the scheme initiated by the remote UE, that is, after receiving the path switch command (for example, RRCReconfiguration), the remote UE and the relay UE Establish a PC5 link and send a handover completion (for example, RRCReconfigurationComplete) message through the relay UE, and the handover completion message will trigger the relay UE to enter the RRC_connected mode.
  • the path switch command for example, RRCReconfiguration
  • RRCReconfigurationComplete for example, RRCReconfigurationComplete
  • Option 1 how to ensure that the target relay UE must be in connected mode is a problem to be solved; for Option 2, if the target relay UE is in RRC_idle or RRC_inactive mode, then in step 2b of Figure 3, the RRC reconfiguration message cannot be sent For the relay UE, therefore, the direct-to-indirect path switch process shown in Figure 3 cannot be carried out smoothly.
  • a network device sends a radio resource control reconfiguration (RRC reconfiguration) message to a remote UE, and the radio resource control reconfiguration (RRC reconfiguration) message
  • the reconfiguration) message includes the information of the target relay UE in the radio resource control connection (RRC_connected) mode, thereby enabling the target relay UE to be in the RRC_connected mode, which helps to use the existing direct-to-indirect path switch process to perform remote UE
  • the switching of the communication path with the network device makes the service interruption time of the remote UE less.
  • the implementation method is simple and the implementation complexity is low.
  • a device for sending and receiving information which is applied to network equipment, and the device includes a first sending and receiving unit, and the first sending and receiving unit is configured to:
  • radio resource control reconfiguration (RRC reconfiguration) message to the first terminal device, where the radio resource control reconfiguration (RRC reconfiguration) message includes a target second terminal device (relay UE) in a radio resource control connected (RRC_connected) mode ) information; and
  • an apparatus for sending and receiving information which is applied to a first terminal equipment (remote UE), the apparatus includes a second transceiver unit, and the second transceiver unit is configured to:
  • Radio resource control reconfiguration (RRC reconfiguration) message sent by the network device, where the radio resource control reconfiguration (RRC reconfiguration) message includes a target second terminal device (relay UE) in a radio resource control connected (RRC_connected) mode information; and
  • the network device sends a radio resource control reconfiguration message to the remote UE, and the radio resource control reconfiguration message includes the information of the target relay UE in the radio resource control connected mode, thereby enabling the The target relay UE is in the RRC_connected mode, which helps to use the existing direct-to-indirect path switch process to switch the communication path between the remote UE and the network device, so that the service interruption time of the remote UE is less.
  • the implementation method is simple, Low implementation complexity.
  • FIG. 1 is a schematic diagram of a scenario where a terminal device is relayed to a network device
  • Fig. 2 is a schematic diagram of the control plane protocol stack of UE-to-Network relay
  • FIG. 3 is a schematic diagram of a process in which a UE switches from a direct path to an indirect path;
  • Fig. 4 is a schematic diagram of the method for sending and receiving information in the embodiment of the first aspect
  • Fig. 5 is a schematic diagram of a method for sending and receiving information according to an embodiment of the second aspect
  • Figure 6 is a schematic diagram of relay UE switching directly to indirect paths in RRC_idle or RRC_inactive mode
  • Fig. 7 is a schematic diagram of the device for sending and receiving information described in the embodiment of the third aspect
  • Fig. 8 is a schematic diagram of the device for sending and receiving information described in the embodiment of the fourth aspect
  • Fig. 9 is a schematic diagram of the device for sending and receiving information described in the embodiment of the fifth aspect.
  • Fig. 10 is a schematic diagram of the device for sending and receiving information according to the embodiment of the sixth aspect
  • Fig. 11 is a schematic diagram of the device for sending and receiving information described in the embodiment of the seventh aspect
  • Fig. 12 is a schematic diagram of a terminal device in a communication system according to an embodiment of the eighth aspect.
  • Fig. 13 is a schematic diagram of network devices in the communication system of the embodiment of the eighth aspect.
  • the terms “first”, “second”, etc. are used to distinguish different elements from the title, but do not indicate the spatial arrangement or time order of these elements, and these elements should not be referred to by these terms restricted.
  • the term “and/or” includes any and all combinations of one or more of the associated listed items.
  • the terms “comprising”, “including”, “having” and the like refer to the presence of stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.
  • the term “communication network” or “wireless communication network” may refer to a network conforming to any of the following communication standards, such as New Radio (NR, New Radio), Long Term Evolution (LTE, Long Term Evolution), Enhanced Long-term evolution (LTE-A, LTE-Advanced), wideband code division multiple access (WCDMA, Wideband Code Division Multiple Access), high-speed packet access (HSPA, High-Speed Packet Access), etc.
  • NR New Radio
  • New Radio Long Term Evolution
  • LTE-A Long-term evolution
  • LTE-A Long-term evolution
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • the communication between devices in the communication system can be carried out according to any stage of communication protocols, such as but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G , New Radio (NR, New Radio), etc., and/or other communication protocols that are currently known or will be developed in the future.
  • Network device refers to, for example, a device in a communication system that connects a terminal device to a communication network and provides services for the terminal device.
  • Network equipment may include but not limited to the following equipment: integrated access and backhaul node (IAB-node), base station (BS, Base Station), access point (AP, Access Point), sending and receiving point (TRP, Transmission Reception Point), broadcast transmitter, mobile management entity (MME, Mobile Management Entity), gateway, server, radio network controller (RNC, Radio Network Controller), base station controller (BSC, Base Station Controller), etc.
  • IAB-node integrated access and backhaul node
  • BS Base Station
  • AP access point
  • TRP Transmission Reception Point
  • MME mobile management entity
  • MME Mobile Management Entity
  • gateway server
  • RNC Radio Network Controller
  • BSC Base Station Controller
  • the base station may include but not limited to: Node B (NodeB or NB), evolved Node B (eNodeB or eNB), and 5G base station (gNB), etc., and may also include Remote Radio Head (RRH, Remote Radio Head) , Remote Radio Unit (RRU, Remote Radio Unit), relay (relay) or low-power nodes (such as femeto, pico, etc.).
  • Node B Node B
  • eNodeB or eNB evolved Node B
  • gNB 5G base station
  • RRH Remote Radio Head
  • RRU Remote Radio Unit
  • relay relay
  • low-power nodes such as femeto, pico, etc.
  • base station may include some or all of their functions, each base station may provide communication coverage for a particular geographic area.
  • the term "cell” can refer to a base station and/or its coverage area depending on the context in which the term is used.
  • the term "User Equipment” (UE, User Equipment) or “terminal equipment” (TE, Terminal Equipment or Terminal Device), for example, refers to a device that accesses a communication network through a network device and receives network services.
  • a terminal device may be fixed or mobile, and may also be called a mobile station (MS, Mobile Station), a terminal, a subscriber station (SS, Subscriber Station), an access terminal (AT, Access Terminal), a station, and the like.
  • the terminal equipment may include but not limited to the following equipment: Cellular Phone (Cellular Phone), Personal Digital Assistant (PDA, Personal Digital Assistant), wireless modem, wireless communication equipment, wireless routing equipment, handheld equipment, machine type communication equipment, laptop Desktop computers, cordless phones, smartphones, smart watches, digital cameras, and more.
  • Cellular Phone Cellular Phone
  • PDA Personal Digital Assistant
  • wireless modem wireless communication equipment
  • wireless routing equipment handheld equipment
  • machine type communication equipment laptop Desktop computers
  • cordless phones smartphones, smart watches, digital cameras, and more.
  • the terminal device can also be a machine or device for monitoring or measurement, such as but not limited to: a machine type communication (MTC, Machine Type Communication) terminal, Vehicle communication terminals, device-to-device (D2D, Device to Device) terminals, machine-to-machine (M2M, Machine to Machine) terminals, relay terminals, etc.
  • MTC Machine Type Communication
  • D2D Device to Device
  • M2M Machine to Machine
  • network side or “network device side” refers to a side of the network, which may be a certain base station, or may include one or more network devices as above.
  • user side or “terminal side” or “terminal device side” refers to a side of a user or a terminal, which may be a certain UE, or may include one or more terminal devices as above.
  • uplink control signal and “uplink control information (UCI, Uplink Control Information)” or “physical uplink control channel (PUCCH, Physical Uplink Control Channel)” are interchangeable, and the term “uplink data Signal” and “uplink data information” or “Physical Uplink Shared Channel (PUSCH, Physical Uplink Shared Channel)” can be interchanged;
  • uplink control information UCI, Uplink Control Information
  • PUCCH Physical Uplink Control Channel
  • downlink control signal and “downlink control information (DCI, Downlink Control Information)” or “physical downlink control channel (PDCCH, Physical Downlink Control Channel)” are interchangeable, and the terms “downlink data signal” and “downlink data information” Or “Physical Downlink Shared Channel (PDSCH, Physical Downlink Shared Channel)” can be interchanged.
  • DCI Downlink Control Information
  • PDCCH Physical Downlink Control Channel
  • sending or receiving PUSCH can be understood as sending or receiving uplink data carried by PUSCH
  • sending or receiving PUCCH can be understood as sending or receiving uplink information carried by PUCCH
  • sending or receiving PRACH can be understood as sending or receiving information carried by PRACH.
  • the uplink signal may include uplink data signal and/or uplink control signal, etc., and may also be called uplink transmission (UL transmission) or uplink information or uplink channel.
  • Sending the uplink transmission on the uplink resource may be understood as sending the uplink transmission using the uplink resource.
  • downlink data/signals/channels/information can be understood accordingly.
  • the high-level signaling may be, for example, radio resource control (RRC) signaling; for example, it is called an RRC message (RRC message), for example, it includes MIB, system information (system information), and a dedicated RRC message; or it is called RRC IE (RRC information element).
  • RRC radio resource control
  • the high-level signaling may also be, for example, MAC (Medium Access Control) signaling; or called MAC CE (MAC control element).
  • the high-level signaling may also be, for example, PDCP control PDU, RLC control PDU, SRAP control PDU, etc., but the present application is not limited thereto.
  • the first terminal device may be the remote UE 101 shown in Figure 1
  • the target second terminal device may be the relay UE 102 shown in Figure 1
  • the network device may be the network device shown in Figure 1 100.
  • the target second terminal device may be one of a plurality of candidate second terminal devices, and the candidate second terminal device may be one or more than one of the second terminal devices.
  • the target second terminal device may be called a target relay UE, and the candidate second terminal device may be called a candidate relay UE.
  • the first terminal device can directly communicate with the network device, that is, the communication path is a direct path (direct path).
  • the first terminal device may also communicate with the network device through the second terminal device, that is, the communication path is an indirect path (indirect path).
  • the communication path between the first terminal device and the network device may be switched from a direct path to an indirect path (ie, direct-to-indirect path switch).
  • the embodiment of the first aspect of the present application is used to solve the above-mentioned problem in Option 1, that is, how to ensure that the target relay UE is in the connected mode during the direct-to-indirect path switch (direct-to-indirect path switch) process.
  • Fig. 4 is a schematic diagram of the method for sending and receiving information in the embodiment of the first aspect. As shown in Figure 4, the methods for sending and receiving information include:
  • the first terminal device sends information about candidate second terminal devices to the network device;
  • the first terminal device receives a radio resource control reconfiguration (RRC reconfiguration) message sent by the network device, and the radio resource control reconfiguration (RRC reconfiguration) message includes the target second terminal device in the radio resource control connected (RRC_connected) mode (relay UE) information; and
  • the first terminal device communicates with the network device through the target second terminal device.
  • the network device sends a radio resource control reconfiguration message to the remote UE, and the radio resource control reconfiguration message includes the information of the target relay UE in the radio resource control connected mode, thereby enabling the target
  • the relay UE is in RRC_connected mode, which helps to use the existing direct-to-indirect path switch process (for example, the process shown in Figure 3) to switch the communication path between the remote UE and the network device, so that the service of the remote UE is interrupted for a long time
  • the implementation of the method is simple and the implementation complexity is low.
  • Embodiment A1 is a diagrammatic representation of Embodiment A1:
  • the target second terminal device (for example, target relay UE) in the RRC reconfiguration message sent by the network device (for example, gNB) to the first terminal device (for example, remote UE) is a relay UE in RRC_connected mode . That is, the network device may select a relay UE in RRC_connected mode from the candidate second terminal devices (for example, candidate relay UEs) reported by the remote UE as the target relay UE.
  • the relay UE reports its own L2 ID to the gNB after entering the RRC_connected mode, or the relay UE reports its own changed L2 ID to the gNB when its own L2 ID changes, and the L2 ID can be the relay UE
  • the identifier assigned by the upper layer (such as V2X layer or ProSe layer or NAS layer), for example, is 24 bits.
  • the L2 ID can be the L2 ID of the relay UE for relay services.
  • the relay UE can also report to the gNB own relay capabilities (such as L2 UE-to-Network relay-related capabilities), so that gNB can obtain which relay UEs with L2 IDs are in RRC_connected mode; when gNB receives the candidate relay UE in the remote UE measurement report For L2 ID, according to the L2 ID of the relay UE reported to the gNB by the relay UE after entering the RRC_connected mode, select the relay UE in the RRC_connected mode from the candidate relay UEs as the target relay UE for the remote UE switching path.
  • the gNB own relay capabilities such as L2 UE-to-Network relay-related capabilities
  • the gNB allocates a Cell Radio Network Temporary Identity (C-RNTI) to the relay UE, therefore, the gNB knows the C-RNTI of the relay UE in the RRC_connected mode, and the remote UE can also use it in the measurement report Report the C-RNTI of the candidate relay UE, so that the gNB can select the relay UE in RRC_connected mode as the target relay UE for the remote UE switching path according to the C-RNTI.
  • C-RNTI Cell Radio Network Temporary Identity
  • the relay UE is required to notify the remote UE of its own C-RNTI, for example, through a PC5-S message or a PC5-RRC message or a side link media access control element (Sidelink MAC CE) or a side link Link control information (Sidelink control information, SCI) etc. are sent.
  • the PC5-S message may be a discovery request (discovery solicitation) message or a discovery response (discovery response) message or a direct communication request (direct communication request) message or a direct communication accept (direct communication accept) message, etc.
  • the PC5-RRC message may It is a side link notification message (NotificationMessageSidelink) or a side link transfer Uu message (UuMessageTransferSidelink), etc.
  • Embodiment A2 is a diagrammatic representation of Embodiment A2:
  • the remote UE can report the candidate relay UE in the RRC_connected mode to the network device.
  • the relay UE can indicate the RRC mode of the relay UE to the remote UE, so that the remote UE can only report the candidate relay UE in the RRC_connected mode to the network device, that is, the measurement report sent by the remote UE to the network device can include RRC_connected
  • the measurement report sent by the remote UE to the network device can include RRC_connected
  • Candidate relay UEs in RRC_idle mode or RRC_inactive mode are not included.
  • the indication sent by the relay UE to the remote UE may be 1 bit (for example, in the 1 bit indication, 1 indicates that the relay UE is in RRC_connected mode, and 0 indicates that the relay UE is in other modes), or, the relay UE
  • the indication sent to the remote UE may include the RRC mode of the relay UE (for example, the RRC mode of the relay UE may be RRC_connected or RRC_idle or RRC_inactive).
  • the indication sent by the relay UE to the remote UE may be sent through a PC5-S message or a PC5-RRC message or a sidelink system information or a sidelink media access control control element (Sidelink MAC CE).
  • the PC5-S message may be a discovery request (discovery solicitation) message or a discovery response (discovery response) message or a direct communication request (direct communication request) message or a direct communication accept (direct communication accept) message, etc.;
  • the PC5-RRC message may It is a side link notification message (NotificationMessageSidelink) or a side link transfer Uu message (UuMessageTransferSidelink), etc.;
  • the side link system information can be a side link master information block (SL-MIB, MasterInformationBlockSidelink), etc.;
  • the side link MAC CE can be MAC CE with one byte length, etc.
  • Embodiment A3 is a diagrammatic representation of Embodiment A3
  • the network device can indicate the relay UE in the RRC_connected mode in the measurement configuration, so that the remote UE can only measure the link quality with the relay UE in the RRC_connected mode.
  • the information of the relay UE can be added for the relay UE, and the information of the added relay UE is, for example, the L2 ID or C-RNTI of the relay UE, etc., These relay UEs are in RRC_connected mode.
  • the remote UE receives the configuration of the relay measurement object, it can only measure the relay UE indicated by the network device, that is, the relay UE in the RRC_connected mode. Therefore, the candidate relay UE in the measurement report sent by the remote UE to the network device is in the Relay UE in RRC_connected mode.
  • the relay UE providing the relay service remains in the RRC_connected mode, and if the relay UE enters the RRC_idle or RRC_inactive mode, the relay service is not provided.
  • the network device may not instruct the relay UE to enter the RRC_idle or RRC_inactive mode, for example, the network device will not send an RRC release message or a suspension indication to the relay UE capable of acting as a relay or to be used as a relay ( Suspend indication) RRC release message, or the network device will accept the relay UE's RRC connection establishment request or RRC reestablishment request or RRC restart (Resume) request, etc., that is, the network device does not reject these requests from the relay UE, so that the relay The UE remains in RRC_connected mode; and/or, when the relay UE is in RRC_idle or RRC_inactive mode, the relay UE does not send messages related to the discovery process to the remote UE, for example, the relay UE does not send the following message on the side link At least one of: discovery request (discovery solicitation) message, discovery response (discovery response) message, direct communication request (direct communication request) message, direct communication
  • discovery request discovery request
  • a method for making the target relay UE in the RRC_connected mode which helps to switch the path between the remote UE and the network by using the existing direct-to-indirect path switch process, so that the remote UE's There is less service interruption time; in addition, the method for sending and receiving signals in the embodiment of the first aspect is simple, and the implementation complexity is low.
  • the embodiment of the second aspect of the present application is used to solve the problem in the above-mentioned Option 2, that is, during the direct-to-indirect path switch (direct-to-indirect path switch), if the target relay UE is in RRC_idle or RRC_inactive mode, then How the target relay UE receives the RRC reconfiguration message.
  • Fig. 5 is another schematic diagram of the method for sending and receiving information according to the embodiment of the second aspect. As shown in Figure 5, the method for sending and receiving information includes:
  • the second terminal device (relay UE) in the radio resource control idle (RRC_idle) mode or the radio resource control inactive (RRC_inactive) mode receives the radio resource control reconfiguration complete (RRC UE) sent by the first terminal device (remote UE). reconfiguration complete) message, and enter the radio resource control connected (RRC_connected) mode; and
  • the second terminal device receives a radio resource control reconfiguration (RRC reconfiguration) message sent by the network device, and performs relay-related configuration on the PC5 interface and the Uu interface.
  • RRC reconfiguration radio resource control reconfiguration
  • the RRC reconfiguration message to the relay UE may be sent after the relay UE enters the RRC_connected mode, or after the relay UE enters the RRC_connected mode and sends the L2 ID of the relay UE to the network device (eg, gNB) is sent.
  • the network device eg, gNB
  • the relay UE can send the L2 ID of the relay UE to the gNB through, for example, a Sidelink UE Information (SUI) message, so that the gNB can identify the relay UE entering the RRC_connected mode It is the target relay UE of the path switch of the remote UE, so as to send an RRC reconfiguration message to the target relay UE subsequently to configure the PC5 interface and the Uu interface.
  • SAI Sidelink UE Information
  • the condition for the relay UE to send the L2 ID may include that the relay UE receives the RRC reconfiguration complete message sent by the remote UE, for example, the RRC The reconfiguration complete message is sent by the remote UE to the network device via the relay UE, or the relay UE receives the RRC reconfiguration complete message carried by SRB0 from the remote UE on the PC5 interface, or the relay UE receives the RRC reconfiguration complete message from the remote UE on the PC5 interface using the default
  • the RRC reconfiguration complete message sent by configuration (or specified configuration or predefined configuration), the default configuration (or specified configuration or predefined configuration) may be the default (or specified or predefined) side link RLC bearer configuration For example, a default (or specified or predefined) SL-RLC0 configuration or a default SL-RLC1 configuration, the default (or specified or predefined) side link RLC bearer
  • Fig. 6 is a schematic diagram of relay UE switching from direct to indirect path in RRC_idle or RRC_inactive mode. As shown in Figure 6, the path switching process includes the following operations:
  • Operation 0. remote Uplink data and/or downlink data (UL/DL data) are transmitted between the UE and the network device (for example, gNB) through the Uu interface.
  • the network device for example, gNB
  • the gNB sends the measurement configuration (Measurement configuration) to the remote UE.
  • the remote UE After measuring and/or discovering candidate relay UEs, the remote UE reports the ID of one or more candidate relay UEs; in addition, the remote UE can also report traditional Uu measurement results.
  • the remote UE may at least report the relay UE ID, the serving cell ID of the relay UE, and the SL measurement information, wherein the SL measurement information may be the sidelink reference signal received power (sidelink-reference signal received power, SL-RSRP) of the candidate relay UE, if If SL-RSRP is not available, use sidelink discovery-reference signal received power (sidelink discovery-reference signal received power, SD-RSRP).
  • SL-RSRP sidelink-reference signal received power
  • SD-RSRP sidelink discovery-reference signal received power
  • Operation 2 The gNB decides to handover the remote UE to the target relay UE.
  • the gNB sends the RRCReconfiguration message to the remote UE.
  • the content of the message may at least include the Relay UE ID, the PC5RLC configuration of the relay service and the related end-to-end radio bearer (radio bearer).
  • the Remote UE stops the user plane (user plane, UP) and control plane (control plane, CP) transmission after receiving the RRCReconfiguration message from the gNB.
  • Operation 4 The remote UE establishes a PC5 connection with the target relay UE.
  • the remote UE sends a radio resource control reconfiguration complete (RRCReconfigurationComplete) to the target relay UE.
  • RRCReconfigurationComplete radio resource control reconfiguration complete
  • the target relay UE sends a radio resource control establishment request message to the gNB. For example, when the target relay UE receives the RRC reconfiguration complete message from the remote UE, it will trigger the RRC connection establishment process of the target relay UE itself.
  • Operation 7 The gNB sends a radio resource control setup message to the target relay UE.
  • Operation 8 The target relay UE sends a radio resource control establishment complete message to the gNB.
  • the target relay UE indicates the UE identity (UE ID, such as L2 ID or C-RNTI) of the target relay UE and the layer 2 identity (L2 ID) of the remote UE through the SUI message.
  • UE ID such as L2 ID or C-RNTI
  • L2 ID layer 2 identity
  • the gNB sends a radio resource control reconfiguration (RRC reconfiguration) message to the target relay UE, which may include at least the local ID (local ID) and layer 2 ID (L2 ID) of the remote UE, Uu and PC5 interfaces for Relay RLC configuration and bearer mapping configuration.
  • RRC reconfiguration radio resource control reconfiguration
  • the target relay UE sends a radio resource control reconfiguration complete (RRC reconfiguration complete) message to the gNB.
  • RRC reconfiguration complete radio resource control reconfiguration complete
  • the target relay UE forwards the radio resource control reconfiguration complete (RRC reconfiguration complete) message sent by the remote UE received in operation 5 to the gNB to complete the path switch process.
  • RRC reconfiguration complete radio resource control reconfiguration complete
  • Operation 13 The data path between the remote UE and the gNB is switched from the direct path to the indirect path, that is, the remote UE transmits uplink data and/or downlink data (UL and/or DL data) with the gNB through the target relay UE.
  • uplink data and/or downlink data UL and/or DL data
  • the remote UE has received the RRC reconfiguration message sent by the network device, and can perform related configurations such as SRAP and RLC channel on the PC5 interface. Therefore, in operation 5, the remote UE can theoretically be in SRB1 Send the RRC reconfiguration complete message on the PC5 interface, and the RRC reconfiguration complete message will be transmitted using the SRAP sublayer on the PC5 interface.
  • the relay UE since the relay UE has not yet received the RRC reconfiguration message sent by the network device to configure the PC5 interface and Uu interface (including SRAP configuration and RLC channel configuration of the PC5 interface, etc.), for example, the relay UE may not be established on the PC5 interface or Configure the SRAP entity and/or RLC channel, so if the remote UE uses the SRAP sublayer to send the RRC reconfiguration complete message, the relay UE cannot correctly receive the RRC reconfiguration complete message.
  • the sending of the RRC reconfiguration complete message of the remote UE may not use SRAP-related functions on the PC5 interface or SRAP does not appear , or, the RRC reconfiguration complete message of the remote UE can be sent using SRB0, or the remote UE can use the default configuration to send the RRC reconfiguration complete message, and the default configuration (or specified configuration or predefined configuration) can be the aforementioned default (or specified or predefined) side link RLC bearer configuration, etc.
  • the relay UE originally in RRC_idle mode or RRC_inactive mode can correctly receive the RRC reconfiguration complete message sent by the remote UE on the PC5 interface when it enters the RRC_connected mode and acts as the target relay UE. , and ensure that the remote UE successfully completes the handover from the direct path to the relay UE communicating with the network through the RRC_connected relay UE.
  • the embodiment of the third aspect provides a device for sending and receiving information. Applied to a network device, for example, the network device 100 in FIG. 1 .
  • the function of the apparatus for sending and receiving information corresponds to the method of the network device in the embodiment of the first aspect.
  • Fig. 7 is a schematic diagram of the device for sending and receiving information according to the embodiment of the third aspect.
  • the device 700 for sending and receiving information includes a first transceiver unit 701, and the first transceiver unit 701 is configured to:
  • Radio resource control reconfiguration Sending a radio resource control reconfiguration (RRC reconfiguration) message to the first terminal device, where the radio resource control reconfiguration (RRC reconfiguration) message includes a target second terminal device (for example, a target relay UE) in a radio resource control connected (RRC_connected) mode ) information; and
  • the target second terminal communicates with the first terminal.
  • the target second terminal device can be placed in the RRC_connected mode, which helps to switch the path between the remote UE and the network by using the existing direct-to-indirect path switch process, so that the service of the remote UE The interruption time is less; moreover, the implementation method has low implementation complexity.
  • the first transceiving unit 701 may select to be in the radio resource control connected (RRC_connected) mode according to the information of the candidate second terminal device (for example, candidate relay UE) sent by the first terminal device
  • the candidate second terminal device of is used as the target second terminal device.
  • the first transceiving unit 701 receives identification information sent by the second terminal device entering the radio resource control connected (RRC_connected) mode, for example, the identification information is a layer 2 identification (L2 L2 ID).
  • the first transceiving unit 701 selects a candidate second terminal device in a radio resource control connected (RRC_connected) mode based on the identification information and the information of the candidate second terminal device (for example, a candidate relay UE) sent by the first terminal device.
  • a candidate second terminal device reports its own L2 ID to the gNB after entering the RRC_connected mode, or the candidate relay UE reports its own changed L2 ID to the gNB when its own L2 ID changes, the L2
  • the ID may be an identifier assigned by an upper layer (for example, a V2X layer or a ProSe layer or a NAS layer) in the candidate relay UE, for example, 24 bits, and the L2 ID may be the L2 ID for the relay service of the candidate relay UE; in addition , the candidate relay UE can also report its own relay capabilities (such as L2 UE-to-Network relay-related capabilities) to the gNB (for example, the first transceiver unit 701 of the gNB), so which L2 IDs can the gNB obtain The relay UE is in RRC_connected mode; when the gNB receives the L2 ID of the candidate relay UE in the remote UE measurement report, it selects from the candidate relay UE
  • the network device may allocate identification information of the second terminal device, for example, the identification information is a Cell Radio Network Temporary Identity (C-RNTI).
  • C-RNTI Cell Radio Network Temporary Identity
  • the first transceiving unit 701 may select a candidate second terminal device in a radio resource control connected (RRC_connected) mode based on the identification information and the information of the candidate second terminal device (for example, a candidate relay UE) sent by the first terminal device.
  • RRC_connected radio resource control connected
  • the second terminal device may send the identification information of the second terminal device to the first terminal device.
  • C-RNTI Cell Radio Network Temporary Identification
  • the first transceiving unit 701 may receive information about a candidate second terminal device (relay UE) in a radio resource control connected (RRC_connected) mode sent by the first terminal device.
  • a candidate second terminal device relay UE
  • RRC_connected radio resource control connected
  • the first transceiving unit 701 may be further configured to: send indication information for indicating the second terminal device in the connection mode to the first terminal device. Therefore, the first terminal device can measure the second terminal device in the connection mode based on the indication information, and the first transceiving unit 701 can receive the candidate terminal device in the connection mode sent by the first terminal device based on the measurement result.
  • Information about the second terminal equipment (relay UE).
  • the first transceiving unit 701 does not instruct the target second terminal device to enter the non-connected mode.
  • the first transceiver unit 701 will not send an RRC release message or an RRC release message with a suspend indication (Suspend indication) to a relay UE capable of acting as a relay or will be used as a relay, or the first transceiver unit 701 will accept The relay UE's RRC connection establishment request or RRC reestablishment request or RRC restart (Resume) request, etc., that is, the first transceiver unit 701 does not reject these requests of the relay UE, so that the relay UE remains in the RRC_connected mode.
  • the embodiment of the fourth aspect provides a device for sending and receiving information.
  • a device for sending and receiving information Applied to the first terminal equipment, for example, remote UE 101 in FIG. 1 .
  • the function of the device for sending and receiving information corresponds to the method for remote UE in the embodiment of the first aspect.
  • Fig. 8 is a schematic diagram of the device for sending and receiving information according to the embodiment of the fourth aspect.
  • the device 800 for sending and receiving information includes a second transceiver unit 801, and the second transceiver unit 801 is configured to:
  • a candidate second terminal device for example, a candidate relay UE
  • Radio resource control reconfiguration (RRC reconfiguration) message sent by the network device, where the radio resource control reconfiguration (RRC reconfiguration) message includes information about a target second terminal device (relay UE) in a radio resource control connected (RRC_connected) mode ;as well as
  • the target second terminal communicates with the network device.
  • the target second terminal device can be placed in the RRC_connected mode, which helps to use the existing direct-to-indirect path switch process to switch the path between the remote UE and the network communication, so that the remote UE's business
  • the interruption time is less; moreover, the implementation method has low implementation complexity.
  • the second transceiving unit 801 sends information about a candidate second terminal device (for example, a candidate relay UE) in a radio resource control connected (RRC_connected) mode to the network device.
  • a candidate second terminal device for example, a candidate relay UE
  • RRC_connected radio resource control connected
  • the second transceiving unit 801 is further configured to: receive indication information sent by the second terminal device for indicating the RRC mode of the second terminal device. Therefore, the second transceiving unit 801 can send the information of the candidate second terminal equipment (relay UE) in the radio resource control connected (RRC_connected) mode to the network device based on the indication information. For example, the indication sent by the relay UE to the second transceiver unit 801 may be sent through a PC5-S message or a PC5-RRC message or a sidelink system information or a sidelink media access control control element (Sidelink MAC CE).
  • the PC5-S message may be a discovery request (discovery solicitation) message or a discovery response (discovery response) message or a direct communication request (direct communication request) message or a direct communication accept (direct communication accept) message, etc.;
  • the PC5-RRC message may It is a side link notification message (NotificationMessageSidelink) or a side link transfer Uu message (UuMessageTransferSidelink), etc.;
  • the side link system information can be a side link master information block (SL-MIB, MasterInformationBlockSidelink), etc.;
  • the side link MAC CE can be MAC CE with one byte length, etc.
  • the second transceiver unit 801 may also be configured as:
  • the second transceiving unit 801 may send the information of the candidate second terminal device (for example, the candidate relay UE) in the connected mode to the network device based on the above measurement result.
  • the candidate second terminal device for example, the candidate relay UE
  • the embodiment of the fifth aspect provides a device for sending and receiving information.
  • a device for sending and receiving information Applied to the second terminal equipment, for example, relay UE 102 in FIG. 1 .
  • the function of the device for sending and receiving information corresponds to the relay UE method of implementation mode A4 in the embodiment of the first aspect.
  • Fig. 9 is a schematic diagram of the device for sending and receiving information according to the embodiment of the fifth aspect.
  • the device 900 for sending and receiving information includes a third transceiver unit 901, and the third transceiver unit 901 is configured to:
  • the third transceiver unit 901 When the second terminal device is not in the radio resource control connected (RRC_connected) mode (for example, in the RRC_idle or RRC_inactive mode), the third transceiver unit 901 does not send messages related to the discovery (discovery) process or is not executing Following related functions.
  • RRC_connected radio resource control connected
  • the third transceiver unit 901 does not send messages related to the discovery (discovery) process or does not perform relay-related functions, for example, including: the third transceiver unit 901 does not send at least one of the following messages on the side link: discovery request (discovery solicitation) message, discovery response (discovery response) message, direct communication request (direct communication request) message, direct communication accept (direct communication accept) message and side link system information (such as SL-MIB), to prevent The remote UE discovers the relay UE.
  • discovery request discovery solicitation
  • discovery response discovery response
  • direct communication request direct communication request
  • direct communication accept direct communication accept
  • side link system information such as SL-MIB
  • the third transceiver unit 901 does not perform relay-related functions, for example, including: a discovery request (discovery solicitation) message and/or a discovery response (discovery response) message sent by the third transceiver unit 901 on the side link and/or Direct communication request (direct communication request) message and/or direct communication accept (direct communication accept) message and/or side link system information (such as SL-MIB), indicating that it does not perform relay-related functions or has no intermediate Relay capability or not provide remote UE connection to the network, etc.
  • a discovery request discovery solicitation
  • a discovery response discovery response
  • Direct communication request direct communication request
  • direct communication accept direct communication accept
  • side link system information such as SL-MIB
  • the embodiment of the sixth aspect provides a device for sending and receiving information. Applied to a network device, for example, the network device 100 in FIG. 1 .
  • the function of the apparatus for sending and receiving information corresponds to the method of the network device in the embodiment of the second aspect.
  • Fig. 10 is a schematic diagram of the device for sending and receiving information according to the embodiment of the sixth aspect.
  • the device 1000 for sending and receiving information includes a fourth transceiver unit 1001, and the fourth transceiver unit 1001 is configured to:
  • the fourth transceiver unit 1001 sends a radio resource control reconfiguration (RRC reconfiguration) message to the second terminal device, so that the second terminal device performs PC5 interface and Relay-related configuration of the Uu interface.
  • RRC reconfiguration radio resource control reconfiguration
  • the fourth transceiving unit 1001 is further configured to: receive identification information sent by the second terminal device.
  • the fourth transceiving unit 1001 receives the identification information from the second terminal device through a Sidelink UE Information (SUI) message.
  • the identification information may be, for example, the L2 ID of the second terminal device.
  • the fourth transceiver unit 101 sends the radio resource control reconfiguration (RRC reconfiguration) message (for example, operation 10 of FIG. 6 ), the sidelink terminal equipment information (Sidelink UE Information, SUI) message
  • RRC reconfiguration radio resource control reconfiguration
  • SUI sidelink terminal equipment information
  • the identification information is received from the second terminal device (for example, operation 9 in FIG. 6 ).
  • the relay UE originally in RRC_idle mode or RRC_inactive mode enters RRC_connected mode and serves as the target relay UE, it can correctly receive the RRC reconfiguration complete message sent by the remote UE on the PC5 interface, and ensure that the remote UE Successful completion of handover from direct path to relay UE communication with the network via RRC_connected.
  • the embodiment of the seventh aspect provides a device for sending and receiving information.
  • the second terminal equipment for example, relay UE 102 in FIG. 1 .
  • the function of the apparatus for sending and receiving information corresponds to the method of the second terminal device (for example, relay UE) in the embodiment of the second aspect.
  • Fig. 11 is a schematic diagram of the device for sending and receiving information according to the embodiment of the seventh aspect.
  • the device 1100 for sending and receiving information includes a fifth transceiver unit 1101, and the fifth transceiver unit 1101 is configured to:
  • the fifth transceiver unit 1101 receives the radio resource control reconfiguration completed (RRC reconfiguration complete) message, and make the second terminal device enter the radio resource control connected (RRC_connected) mode;
  • Radio resource control reconfiguration RRC reconfiguration
  • the fifth transceiving unit 1101 may also be configured to: send identification information to a network device.
  • the identification information is, for example, the L2 ID of the second terminal device.
  • the fifth transceiver unit 1101 may send the identification information to the network device through a Sidelink UE Information (SUI) message.
  • SAI Sidelink UE Information
  • the condition for sending the identification information by the fifth transceiver unit 1101 or the condition for initiating the SUI process or the purpose for initiating the SUI may include: the second terminal device receives a radio resource control reconfiguration complete (RRC reconfiguration complete) message sent by the first terminal device .
  • RRC reconfiguration complete radio resource control reconfiguration complete
  • the RRC reconfiguration complete message is sent by the first terminal device (for example, remote UE) to the network device via the second terminal device (for example, relay UE), or the fifth transceiver unit 1101 transmits
  • the SRB0 received by the device bears the radio resource control reconfiguration complete (RRC reconfiguration complete) message, or the fifth transceiver unit 1101 may receive the radio resource control reconfiguration complete message sent by default configuration from the first terminal device on the PC5 interface.
  • the default configuration may be the default (or specified or predefined) side link RLC bearer configuration, such as the default (or specified or predefined) SL-RLC0 configuration or default (or specified or predefined) SL-RLC1 configuration, the default (or specified or predefined) side link RLC bearer configuration may include at least one of the following: SN domain Length, reassembly time, logical channel identification, logical channel priority, preferred bit rate, logical channel group configuration, etc.
  • the fifth transceiver unit 1101 after sending the identification information to the network device, the fifth transceiver unit 1101 receives a radio resource control reconfiguration (RRC reconfiguration) message from the network device.
  • RRC reconfiguration radio resource control reconfiguration
  • the relay UE originally in RRC_idle mode or RRC_inactive mode enters RRC_connected mode and serves as the target relay UE, it can correctly receive the RRC reconfiguration complete message sent by the remote UE on the PC5 interface, and ensure that the remote UE Successful completion of handover from direct path to relay UE communication with the network via RRC_connected.
  • the embodiment of the present application also provides a communication system.
  • the communication system may include a first terminal device, a second terminal device, and a network device.
  • the first terminal device may be the remote UE 101 in FIG. 1
  • the second terminal device may be The relay UE 102 in FIG. 1
  • the network device may be the network device 100 in FIG. 1.
  • the first terminal device and the second terminal device may adopt a similar terminal device structure.
  • Fig. 12 is a schematic diagram of a terminal device in the communication system of the embodiment of the eighth aspect.
  • the terminal device shown in FIG. 12 can be used for the first terminal device, and can also be used for the second terminal device.
  • a terminal device 1200 may include: a processor 1210 (such as a central processing unit CPU) and a memory 1220 ; the memory 1220 is coupled to the processor 1210 .
  • the memory 1220 can store various data; in addition, it also stores a program 1230 for information processing, and executes the program 1230 under the control of the processor 1210 .
  • the processor 1210 may be configured to execute a program to implement the method described in the first aspect or the second aspect.
  • the terminal device 1200 may further include: a transceiver 1240 and an antenna 1250 ; wherein, the functions of the above components are similar to those of the prior art, and will not be repeated here. It should be noted that the terminal device 1200 does not necessarily include all components shown in FIG. 12 ; in addition, the terminal device 1200 may also include components not shown in FIG. 12 , and reference may be made to the prior art.
  • Fig. 13 is a schematic diagram of network devices in the communication system of the embodiment of the eighth aspect.
  • a network device 1300 may include: a processor 1310 (such as a central processing unit CPU) and a memory 1320 ; the memory 1320 is coupled to the processor 1310 .
  • the memory 1320 can store various data; in addition, it also stores a program 1330 for information processing, and executes the program 1330 under the control of the processor 1310 .
  • the processor 1310 may be configured to execute a program to implement the method described in the first aspect or the second aspect.
  • the network device 1300 may further include: a transceiver 1340 and an antenna 1350 ; wherein, the functions of the above components are similar to those of the prior art, and will not be repeated here. It should be noted that the network device 1300 does not necessarily include all the components shown in FIG. 13 ; in addition, the network device 1300 may also include components not shown in FIG. 13 , and reference may be made to the prior art.
  • the embodiment of the present application also provides a computer program, wherein when the program is executed in the first terminal device or the second terminal device, the program causes the first terminal device or the second terminal device to execute the first and second terminal devices.
  • the embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program causes the first terminal device or the second terminal device to execute the methods described in the first and second aspects.
  • An embodiment of the present application further provides a computer program, wherein when the program is executed in a network device, the program causes the network device to execute the methods described in the embodiments of the first aspect and the second aspect.
  • the embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program causes the network device to execute the methods described in the first and second embodiments.
  • the above devices and methods in this application can be implemented by hardware, or by combining hardware and software.
  • the present application relates to a computer-readable program that, when executed by a logic component, enables the logic component to realize the above-mentioned device or constituent component, or enables the logic component to realize the above-mentioned various methods or steps.
  • the present application also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memories, and the like.
  • the method/device described in conjunction with the embodiments of the present application may be directly embodied as hardware, a software module executed by a processor, or a combination of both.
  • one or more of the functional block diagrams shown in the figure and/or one or more combinations of the functional block diagrams may correspond to each software module or each hardware module of the computer program flow.
  • These software modules may respectively correspond to the steps shown in the figure.
  • These hardware modules for example, can be realized by solidifying these software modules by using a Field Programmable Gate Array (FPGA).
  • FPGA Field Programmable Gate Array
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other form of storage medium known in the art.
  • a storage medium can be coupled to the processor such that the processor can read information from, and write information to, the storage medium, or it can be an integral part of the processor.
  • the processor and storage medium can be located in the ASIC.
  • the software module can be stored in the memory of the mobile terminal, or can be stored in a memory card that can be inserted into the mobile terminal.
  • the software module can be stored in the MEGA-SIM card or large-capacity flash memory device.
  • One or more of the functional blocks described in the accompanying drawings and/or one or more combinations of the functional blocks can be implemented as a general-purpose processor, a digital signal processor (DSP) for performing the functions described in this application ), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof.
  • DSP digital signal processor
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors processor, one or more microprocessors in communication with a DSP, or any other such configuration.
  • a method for sending and receiving information, applied to network equipment comprising:
  • radio resource control reconfiguration (RRC reconfiguration) message to the first terminal device, where the radio resource control reconfiguration (RRC reconfiguration) message includes a target second terminal device (relay UE) in a radio resource control connected (RRC_connected) mode ) information; and
  • the network device communicates with the first terminal device through the target second terminal device.
  • the network device receives the identification information sent by the second terminal device entering the radio resource control connected (RRC_connected) mode,
  • the network device selects a candidate second terminal device in a radio resource control connected (RRC_connected) mode based on the identification information and the information of the candidate second terminal device (relay UE) sent by the first terminal device.
  • RRC_connected radio resource control connected
  • the identification information is layer 2 (L2) identification information
  • the network device allocates identification information of the second terminal device,
  • the network device selects a candidate second terminal device in a radio resource control connected (RRC_connected) mode based on the identifier and the information of the candidate second terminal device (relay UE) sent by the first terminal device.
  • RRC_connected radio resource control connected
  • the identification information is a cell radio network temporary identification (C-RNTI).
  • C-RNTI cell radio network temporary identification
  • the first terminal device receives the identification information sent by the second terminal device.
  • C-RNTI Cell Radio Network Temporary Identity
  • the network device receives information about a candidate second terminal device (relay UE) in a radio resource control connected (RRC_connected) mode sent by the first terminal device.
  • a candidate second terminal device relay UE
  • RRC_connected radio resource control connected
  • the method also includes:
  • the first terminal device measures the second terminal device in the connection mode based on the indication information
  • the network device receives the information of the candidate second terminal device (relay UE) sent by the first terminal device based on the measurement result.
  • the network device For a target second terminal device in a radio resource control connected (RRC_connected) mode, the network device does not instruct the target second terminal device to enter a non-connected mode.
  • RRC_connected radio resource control connected
  • a method for sending and receiving information, applied to a second terminal device comprising:
  • the second terminal device When not in the radio resource control connected (RRC_connected) mode, the second terminal device does not send messages related to the discovery process or perform functions related to relaying.
  • RRC_connected radio resource control connected
  • Radio resource control reconfiguration (RRC reconfiguration) message sent by the network device, where the radio resource control reconfiguration (RRC reconfiguration) message includes a target second terminal device (relay UE) in a radio resource control connected (RRC_connected) mode information; and
  • the first terminal device communicates with the network device through the target second terminal device.
  • the first terminal device sends information about a candidate second terminal device (relay UE) in a radio resource control connected (RRC_connected) mode to the network device.
  • RRC_connected radio resource control connected
  • the method also includes:
  • the first terminal device sends information about a candidate second terminal device (relay UE) in a radio resource control connected (RRC_connected) mode to the network device based on the indication information.
  • a candidate second terminal device relay UE
  • RRC_connected radio resource control connected
  • the method also includes:
  • the first terminal device receives indication information sent by the network device for indicating the second terminal device in the connection mode
  • the first terminal device measures the second terminal device in the connection mode based on the indication information
  • the first terminal device sends the information of the candidate second terminal device (relay UE) to the network device based on the measurement result.
  • a method for sending and receiving information, applied to a network device comprising:
  • RRC_connected radio resource control connected
  • Radio resource control reconfiguration Sending a radio resource control reconfiguration (RRC reconfiguration) message to the second terminal device, so that the second terminal device performs relay-related configuration of the PC5 interface and the Uu interface.
  • RRC reconfiguration radio resource control reconfiguration
  • the network device receives the identification information from the second terminal device through a Sidelink UE Information (SUI) message.
  • SAI Sidelink UE Information
  • the network device receives the identification information from the second terminal device through a Sidelink UE Information (SUI) message before sending the radio resource control reconfiguration (RRC reconfiguration) message.
  • SAI Sidelink UE Information
  • the second terminal device in the radio resource control idle (RRC_idle) mode or radio resource control inactive (RRC_inactive) mode receives a radio resource control reconfiguration complete (RRC reconfiguration complete) message sent by the first terminal device (remote UE), And, enter the radio resource control connected (RRC_connected) mode; and
  • Radio resource control reconfiguration (RRC reconfiguration) message sent by the network device, and perform relay-related configuration on the PC5 interface and the Uu interface.
  • RRC reconfiguration radio resource control reconfiguration
  • the second terminal device sends identification information to the network device.
  • the second terminal device receives the radio resource control reconfiguration (RRC reconfiguration) message after sending the identification information to the network device.
  • RRC reconfiguration radio resource control reconfiguration
  • the second terminal device sends the identification information to the network device through a Sidelink UE Information (SUI) message.
  • SAI Sidelink UE Information
  • the condition for the second terminal device to send the identification information includes: receiving the radio resource control reconfiguration complete (RRC reconfiguration complete) message sent by the first terminal device.
  • RRC reconfiguration complete radio resource control reconfiguration complete
  • the radio resource control reconfiguration complete message is sent by the first terminal device to the network device via the second terminal device; or,
  • the SRB0 received by the second terminal device from the first terminal device on the PC5 interface bears the radio resource control reconfiguration complete (RRC reconfiguration complete) message;
  • the second terminal device receives the radio resource control reconfiguration complete (RRC reconfiguration complete) message sent by using a default configuration from the first terminal device on the PC5 interface.
  • RRC reconfiguration complete radio resource control reconfiguration complete

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Abstract

本申请实施例提供一种收发信号的装置（700），应用于终端设备，装置包括第一收发单元（701），第一收发单元（701）被配置为：接收第一终端设备发送的候选第二终端设备的信息；向第一终端设备发送无线资源控制重配置消息，无线资源控制重配置消息包括处于无线资源控制连接模式的目标第二终端设备的信息；以及通过目标第二终端设备与第一终端设备通信。

Description

收发信息的方法、装置和通信系统 技术领域
本申请实施例涉及通信技术领域。
背景技术
5G版本17(Release 17，R17)中正在研究边链路中继(Sidelink relay，SL relay)技术，其包含终端设备(例如，UE)到网络设备中继(UE-to-Network Relay)的场景。其中，在中继的终端设备(relay UE)的Uu接口上使用新空口(NR)Uu链路，在远端的终端设备(remote UE)和relay UE之间的PC5接口上假设使用NR sidelink链路。在UE-to-Network Relay的场景下，relay UE又被称为UE-to-Network relay UE。
图1是终端设备到网络设备中继的场景的一个示意图。
如图1的场景1所示，remote UE 101在网络设备100的覆盖范围之外(out of coverage，OOC)，relay UE 102在网络设备100的覆盖范围之内(in coverage，IC)。
如图1的场景2所示，remote UE 101在网络设备100的覆盖范围之内(in coverage，IC)，relay UE 102在网络设备100的覆盖范围之内(in coverage，IC)。
如图1的场景3所示，remote UE 101在网络设备100a的覆盖范围之内(in coverage，IC)，relay UE 102在网络设备100的覆盖范围之内(in coverage，IC)，网络设备100a不同于网络设备100。
在版本17的层2边链路中继(R17 L2 SL relay)的协议栈中，边链路中继适应协议(SRAP，Sidelink Relay Adaptation Protocol)被引入。对于UE-to-Network relay，在PC5接口和在Uu接口，对控制面和用户面协议栈，SRAP子层(sublayer)都位于无线链路控制(RLC)子层之上。Uu服务数据适应协议(SDAP)、分组数据汇聚协议(PDCP)和无线资源控制(RRC)终止在remote UE和网络设备(例如，gNB)之间，而SRAP、RLC、介质访问控制(MAC)和物理(PHY)层终止在每个链路(即remote UE和relay UE之间的链路以及relay UE和gNB之间的链路)。
图2是UE-to-Network relay的控制面协议栈的一个示意图。
对于UE-to-Network relay，PC5接口上的SRAP子层只用于承载映射(bearer mapping)目的。对remote UE在广播控制信(BCCH)和寻呼控制信道(PCCH)上 的消息的中继，SRAP子层在PC5跳(hop)不出现。对remote UE的信令无线承载0(SRB0)上的消息，SRAP子层在PC5hop上不出现，但SRAP子层在对下行链路(DL)和上行链路(UL)的Uu hop出现。
应该注意，上面对技术背景的介绍只是为了方便对本申请的技术方案进行清楚、完整的说明，并方便本领域技术人员的理解而阐述的。不能仅仅因为这些方案在本申请的背景技术部分进行了阐述而认为上述技术方案为本领域技术人员所公知。
发明内容
终端设备(例如，UE)可以直接与网络设备(例如，Network或gNB)通信，该通信路径可以被称为直接路径(direct path)。终端设备也可以通过relay UE与网络设备通信，该通信路径可以被称为间接路径(indirect path)。对L2 UE-to-Network relay的业务连续性，在UE从直接路径切换到间接路径(即，direct to indirect path switch)的情况下，可以使用图3所示的流程。
如图3所示，UE从直接路径切换到间接路径的过程包括如下步骤：
步骤0.remote UE和网络设备(例如，gNB)之间通过Uu接口进行上行数据和/或下行数据(UL/DL data)的传输。
步骤1.remote UE在测量和/或发现候选的relay UE后，报告一个或多于一个候选的relay UE以及传统的Uu测量结果。
其中，remote UE可以至少报告relay UE ID、relay UE的服务小区ID和SL测量信息，其中SL测量信息可以是候选relay UE的边链路参考信号接收功率(sidelink-referencesignalreceivedpower，SL-RSRP)，如果SL-RSRP不可获得，则使用边链路发现参考信号接收功率(sidelink discovery-referencesignalreceivedpower，SD-RSRP)。
步骤2a.gNB决定将remote UE切换到目标relay UE。
步骤2b.gNB发送无线资源控制重配置(RRCReconfiguration)消息给目标relay UE，该消息中可以至少包括remote UE的本地标识(local/temp ID)和层2标识(L2ID)、Uu和PC5接口用于中继的RLC配置、以及承载映射配置。
步骤3.gNB发送RRCReconfiguration消息给remote UE。该消息的内容可以至少包括Relay UE ID、relay业务的PC5RLC配置和相关的端到端无线承载(radio bearer)。Remote UE在收到gNB的RRCReconfiguration消息后停止用户面(user plane，UP) 和控制面(control plane，CP)传输。
步骤4.remote UE与目标relay UE建立PC5连接。
步骤5.remote UE经由relay UE发送无线资源控制重配置完成(RRCReconfigurationComplete)消息给gNB，完成路径切换(path switch)过程。
步骤6.Remote UE和gNB之间，数据path被从direct path切换到indirect path。
在图3所示的路径切换过程中，relay UE有可能处于无线资源控制空闲(RRC_idle)模式或无线资源控制不激活(RRC_inactive)模式或无线资源控制连接(RRC_connected)模式。
其中，对处理relay UE处于无线资源控制空闲(RRC_idle)模式或无线资源控制不激活(RRC_inactive)模式的情况，可以具有如下的选择(option)：
Option 1、direct-to-indirect path switch的目标relay UE必须处于RRC_connected模式。
Option 2、RRC_idle或RRC_inactive模式的relay UE可以被指示为目标relay，并且通过remote UE发起的方案来支持这种情况，即在收到path switch的命令(例如，RRCReconfiguration)后，remote UE与relay UE建立PC5链路并通过relay UE发送切换完成(例如，RRCReconfigurationComplete)消息，该切换完成消息将触发relay UE进入RRC_connected模式。
本申请的发明人发现，上述的Option 1和Option 2各自都有一些问题需要解决。例如，对于Option 1，如何保证目标relay UE必须处于连接模式，是需要解决的问题；对于Option 2，如果目标relay UE处于RRC_idle或RRC_inactive模式，那么在图3的步骤2b中，RRC reconfiguration消息无法发送给relay UE，因此，图3所示的direct-to-indirect path switch过程无法顺利进行。
针对上述问题的至少之一，本申请实施例提供一种收发信息的方法、装置和通信系统，网络设备向remote UE发送无线资源控制重配置(RRC reconfiguration)消息，该无线资源控制重配置(RRC reconfiguration)消息包括处于无线资源控制连接(RRC_connected)模式的目标relay UE的信息，由此，能够使目标relay UE处于RRC_connected模式，有助于采用现有direct-to-indirect path switch流程来进行remote UE与网络设备的通信路径的切换，使remote UE的业务中断时间较少，此外，实现方式简单，实现复杂度低。
根据本申请实施例的一个方面，提供一种收发信息的装置，应用于网络设备，所述装置包括第一收发单元，所述第一收发单元被配置为：
接收第一终端设备发送的候选第二终端设备(relay UE)的信息；
向所述第一终端设备发送无线资源控制重配置(RRC reconfiguration)消息，所述无线资源控制重配置(RRC reconfiguration)消息包括处于无线资源控制连接(RRC_connected)模式的目标第二终端设备(relay UE)的信息；以及
所述通过所述目标第二终端设备与所述第一终端设备通信。
根据本申请实施例的另一个方面，提供一种收发信息的装置，应用于第一终端设备(remote UE)，所述装置包括第二收发单元，所述第二收发单元被配置为：
向网络设备发送候选第二终端设备(relay UE)的信息；
接收所述网络设备发送的无线资源控制重配置(RRC reconfiguration)消息，所述无线资源控制重配置(RRC reconfiguration)消息包括处于无线资源控制连接(RRC_connected)模式的目标第二终端设备(relay UE)的信息；以及
通过所述目标第二终端设备与所述网络设备通信。
本申请实施例的有益效果之一在于：网络设备向remote UE发送无线资源控制重配置消息，该无线资源控制重配置消息包括处于无线资源控制连接模式的目标relay UE的信息，由此，能够使目标relay UE处于RRC_connected模式，有助于采用现有direct-to-indirect path switch流程来进行remote UE与网络设备的通信路径的切换，使remote UE的业务中断时间较少，此外，实现方式简单，实现复杂度低。
参照后文的说明和附图，详细公开了本申请的特定实施方式，指明了本申请的原理可以被采用的方式。应该理解，本申请的实施方式在范围上并不因而受到限制。在所附权利要求的精神和条款的范围内，本申请的实施方式包括许多改变、修改和等同。
针对一种实施方式描述和/或示出的特征可以以相同或类似的方式在一个或更多个其它实施方式中使用，与其它实施方式中的特征相组合，或替代其它实施方式中的特征。
应该强调，术语“包括/包含”在本文使用时指特征、整件、步骤或组件的存在，但并不排除一个或更多个其它特征、整件、步骤或组件的存在或附加。
附图说明
在本申请实施例的一个附图或一种实施方式中描述的元素和特征可以与一个或更多个其它附图或实施方式中示出的元素和特征相结合。此外，在附图中，类似的标号表示几个附图中对应的部件，并可用于指示多于一种实施方式中使用的对应部件。
图1是终端设备到网络设备中继的场景的一个示意图；
图2是UE-to-Network relay的控制面协议栈的一个示意图；
图3是UE从直接路径切换到间接路径的过程的一个示意图；
图4是第一方面的实施例的收发信息的方法的一个示意图；
图5是第二方面的实施例的收发信息的方法的一个示意图；
图6是relay UE在RRC_idle或RRC_inactive模式情况下直接到间接路径切换的一个示意图；
图7是第三方面的实施例所述的收发信息的装置的一个示意图；
图8是第四方面的实施例所述的收发信息的装置的一个示意图；
图9是第五方面的实施例所述的收发信息的装置的一个示意图；
图10是第六方面的实施例所述的收发信息的装置的一个示意图；
图11是第七方面的实施例所述的收发信息的装置的一个示意图；
图12是第八方面的实施例的通信系统中的终端设备的示意图；
图13是第八方面的实施例的通信系统中的网络设备的示意图。
具体实施方式
参照附图，通过下面的说明书，本申请的前述以及其它特征将变得明显。在说明书和附图中，具体公开了本申请的特定实施方式，其表明了其中可以采用本申请的原则的部分实施方式，应了解的是，本申请不限于所描述的实施方式，相反，本申请包括落入所附权利要求的范围内的全部修改、变型以及等同物。
在本申请实施例中，术语“第一”、“第二”等用于对不同元素从称谓上进行区分，但并不表示这些元素的空间排列或时间顺序等，这些元素不应被这些术语所限制。术语“和/或”包括相关联列出的术语的一种或多个中的任何一个和所有组合。术语“包含”、“包括”、“具有”等是指所陈述的特征、元素、元件或组件的存在，但并不排除存在或添加一个或多个其他特征、元素、元件或组件。
在本申请实施例中，单数形式“一”、“该”等包括复数形式，应广义地理解为“一 种”或“一类”而并不是限定为“一个”的含义；此外术语“所述”应理解为既包括单数形式也包括复数形式，除非上下文另外明确指出。此外术语“根据”应理解为“至少部分根据……”，术语“基于”应理解为“至少部分基于……”，除非上下文另外明确指出。
在本申请实施例中，术语“通信网络”或“无线通信网络”可以指符合如下任意通信标准的网络，例如新无线(NR，New Radio)、长期演进(LTE，Long Term Evolution)、增强的长期演进(LTE-A，LTE-Advanced)、宽带码分多址接入(WCDMA，Wideband Code Division Multiple Access)、高速报文接入(HSPA，High-Speed Packet Access)等等。
并且，通信系统中设备之间的通信可以根据任意阶段的通信协议进行，例如可以包括但不限于如下通信协议：1G(generation)、2G、2.5G、2.75G、3G、4G、4.5G以及5G、新无线(NR，New Radio)等等，和/或其他目前已知或未来将被开发的通信协议。
在本申请实施例中，术语“网络设备”例如是指通信系统中将终端设备接入通信网络并为该终端设备提供服务的设备。网络设备可以包括但不限于如下设备：集成的接入和回传节点(IAB-node)、基站(BS，Base Station)、接入点(AP、Access Point)、发送接收点(TRP，Transmission Reception Point)、广播发射机、移动管理实体(MME、Mobile Management Entity)、网关、服务器、无线网络控制器(RNC，Radio Network Controller)、基站控制器(BSC，Base Station Controller)等等。
其中，基站可以包括但不限于：节点B(NodeB或NB)、演进节点B(eNodeB或eNB)以及5G基站(gNB)，等等，此外还可包括远端无线头(RRH，Remote Radio Head)、远端无线单元(RRU，Remote Radio Unit)、中继(relay)或者低功率节点(例如femeto、pico等等)。并且术语“基站”可以包括它们的一些或所有功能，每个基站可以对特定的地理区域提供通信覆盖。术语“小区”可以指的是基站和/或其覆盖区域，这取决于使用该术语的上下文。
在本申请实施例中，术语“用户设备”(UE，User Equipment)或者“终端设备”(TE，Terminal Equipment或Terminal Device)例如是指通过网络设备接入通信网络并接收网络服务的设备。终端设备可以是固定的或移动的，并且也可以称为移动台(MS，Mobile Station)、终端、用户台(SS，Subscriber Station)、接入终端(AT，Access Terminal)、站，等等。
其中，终端设备可以包括但不限于如下设备：蜂窝电话(Cellular Phone)、个人数字助理(PDA，Personal Digital Assistant)、无线调制解调器、无线通信设备、无线路由设备、手持设备、机器型通信设备、膝上型计算机、无绳电话、智能手机、智能手表、数字相机，等等。
再例如，在物联网(IoT，Internet of Things)等场景下，终端设备还可以是进行监控或测量的机器或装置，例如可以包括但不限于：机器类通信(MTC，Machine Type Communication)终端、车载通信终端、设备到设备(D2D，Device to Device)终端、机器到机器(M2M，Machine to Machine)终端、中继终端，等等。
此外，术语“网络侧”或“网络设备侧”是指网络的一侧，可以是某一基站，也可以包括如上的一个或多个网络设备。术语“用户侧”或“终端侧”或“终端设备侧”是指用户或终端的一侧，可以是某一UE，也可以包括如上的一个或多个终端设备。
在不引起混淆的情况下，术语“上行控制信号”和“上行控制信息(UCI，Uplink Control Information)”或“物理上行控制信道(PUCCH，Physical Uplink Control Channel)”可以互换，术语“上行数据信号”和“上行数据信息”或“物理上行共享信道(PUSCH，Physical Uplink Shared Channel)”可以互换；
术语“下行控制信号”和“下行控制信息(DCI，Downlink Control Information)”或“物理下行控制信道(PDCCH，Physical Downlink Control Channel)”可以互换，术语“下行数据信号”和“下行数据信息”或“物理下行共享信道(PDSCH，Physical Downlink Shared Channel)”可以互换。
另外，发送或接收PUSCH可以理解为发送或接收由PUSCH承载的上行数据，发送或接收PUCCH可以理解为发送或接收由PUCCH承载的上行信息，发送或接收PRACH可以理解为发送或接收由PRACH承载的preamble；上行信号可以包括上行数据信号和/或上行控制信号等，也可以称为上行传输(UL transmission)或上行信息或上行信道。在上行资源上发送上行传输可以理解为使用该上行资源发送该上行传输。类似地，可以相应地理解下行数据/信号/信道/信息。
在本申请实施例中，高层信令例如可以是无线资源控制(RRC)信令；例如称为RRC消息(RRC message)，例如包括MIB、系统信息(system information)、专用RRC消息；或者称为RRC IE(RRC information element)。高层信令例如还可以是MAC(Medium Access Control)信令；或者称为MAC CE(MAC control element)。 此外，高层信令例如还可以是PDCP控制PDU、RLC控制PDU、SRAP控制PDU等，但本申请不限于此。
在本申请的实施例中，第一终端设备可以是图1所示的remote UE 101，目标第二终端设备可以是图1所示的relay UE 102，网络设备可以是图1所示的网络设备100。
目标第二终端设备可以是多个候选第二终端设备中的一者，并且，候选第二终端设备可以是第二终端设备中的一个或多于一个。目标第二终端设备可以被称为目标relay UE，候选第二终端设备可以被称为候选relay UE。
第一终端设备可以直接与网络设备通信，即，通信路径为直接路径(direct path)。第一终端设备也可以通过第二终端设备与网络设备通信，即，通信路径为间接路径(indirect path)。第一终端设备与网络设备之间的通信路径可以从直接路径切换到间接路径(即，direct-to-indirect path switch)。
第一方面的实施例
本申请第一方面的实施例用于解决上述Option 1中的问题，即，在直接到间接路径切换(direct-to-indirect path switch)的过程中，如何保证目标relay UE处于连接模式。
图4是第一方面的实施例的收发信息的方法的一个示意图。如图4所示，收发信息的方法包括：
操作401、第一终端设备向网络设备发送候选第二终端设备的信息；
操作402、第一终端设备接收网络设备发送的无线资源控制重配置(RRC reconfiguration)消息，该无线资源控制重配置(RRC reconfiguration)消息包括处于无线资源控制连接(RRC_connected)模式的目标第二终端设备(relay UE)的信息；以及
操作403、第一终端设备通过该目标第二终端设备与该网络设备通信。
通过本申请第一方面的实施例，网络设备向remote UE发送无线资源控制重配置消息，该无线资源控制重配置消息包括处于无线资源控制连接模式的目标relay UE的信息，由此，能够使目标relay UE处于RRC_connected模式，有助于采用现有direct-to-indirect path switch流程(例如，图3所示的流程)来进行remote UE与网络设备的通信路径的切换，使remote UE的业务中断时间较少，另外，该方法的实现方 式简单，实现复杂度低。
下面，具体说明图4所示的方法的实施方式。
实施方式A1：
在实施方式A1中，网络设备(例如，gNB)发送给第一终端设备(例如，remote UE)的RRC reconfiguration消息中的目标第二终端设备(例如，目标relay UE)是处于RRC_connected模式的relay UE。即，网络设备可以从remote UE上报的候选第二终端设备(例如，候选relay UE)中选择处于RRC_connected模式的relay UE，作为目标relay UE。
例如，在一个实施例中，relay UE在进入RRC_connected模式后向gNB报告自己的L2 ID或者relay UE在自己的L2 ID发生改变时向gNB报告自己改变的L2 ID，该L2 ID可以是该relay UE中的上层(例如V2X层或ProSe层或NAS层)分配的标识，例如为24比特，该L2 ID可以是该relay UE的用于中继业务的L2 ID，此外，relay UE还可以向gNB报告自己的中继能力(例如L2 UE-to-Network中继相关的能力)等，这样，gNB可以获得哪些L2 ID的relay UE处于RRC_connected模式；在gNB收到remote UE测量报告中的候选relay UE的L2 ID时，根据进入RRC_connected模式后的relay UE向gNB报告的该relay UE的L2 ID，从候选relay UE中选择RRC_connected模式的relay UE作为该remote UE切换路径的目标relay UE。
又例如，在另一个实施例中，gNB为relay UE分配小区无线网络临时标识(C-RNTI)，因此，gNB知道RRC_connected模式的relay UE的C-RNTI，并且，remote UE在测量报告中也可以报告候选relay UE的C-RNTI，由此，gNB可以根据C-RNTI选择RRC_connected模式的relay UE作为该remote UE切换路径的目标relay UE。在该实施例中，需要relay UE将自己的C-RNTI通知给remote UE，例如，可以通过PC5-S消息或PC5-RRC消息或边链路媒体接入控制控制元素(Sidelink MAC CE)或边链路控制信息(Sidelink control information，SCI)等发送。其中，PC5-S消息可以是发现请求(discovery solicitation)消息或发现响应(discovery response)消息或直接通信请求(direct communication request)消息或直接通信接受(direct communication accept)消息等；PC5-RRC消息可以是边链路通知消息(NotificationMessageSidelink)或边链路转移Uu消息(UuMessageTransferSidelink)等。
实施方式A2：
在实施方式A2中，remote UE可以将处于RRC_connected模式的候选relay UE报告给网络设备。其中，relay UE可以向remote UE指示该relay UE的RRC模式，由此，remote UE可以仅向网络设备报告处于RRC_connected模式的候选relay UE，即，remote UE向网络设备发送的测量报告中可以包括RRC_connected模式的候选relay UE，而不包括RRC_idle模式或RRC_inactive)模式的候选relay UE。
在实施方式A2中，relay UE向remote UE发送的指示可以是1bit(例如，在该1bit的指示中，1表示该relay UE处于RRC_connected模式，0表示该relay UE处于其他模式)，或者，relay UE向remote UE发送的指示可以包含relay UE的RRC模式(例如，relay UE的RRC模式可以是RRC_connected或RRC_idle或RRC_inactive)。
在实施方式A2中，relay UE向remote UE发送的指示可以通过PC5-S消息或PC5-RRC消息或边链路系统信息或边链路媒体接入控制控制元素(Sidelink MAC CE)等发送。其中，PC5-S消息可以是发现请求(discovery solicitation)消息或发现响应(discovery response)消息或直接通信请求(direct communication request)消息或直接通信接受(direct communication accept)消息等；PC5-RRC消息可以是边链路通知消息(NotificationMessageSidelink)或边链路转移Uu消息(UuMessageTransferSidelink)等；边链路系统信息可以是边链路主信息块(SL-MIB，MasterInformationBlockSidelink)等；边链路MAC CE可以是具有一个字节长度的MAC CE等。
实施方式A3：
在实施方式A3中，网络设备可以在测量配置中指示处于RRC_connected模式的relay UE，由此，remote UE可以只测量与处于RRC_connected模式的relay UE之间的链路质量。
在实施方式A3的至少一个实施例中，网络设备在配置测量对象时，针对relay UE，可以增加relay UE的信息，该增加的relay UE的信息例如是relay UE的L2 ID或C-RNTI等，这些relay UE处于RRC_connected模式。这样，remote UE在收到relay测量对象配置时，可以仅测量网络设备指示的relay UE，也就是处于RRC_connected模式的relay UE，因而，remote UE发给网络设备的测量报告中的候选relay UE是处于RRC_connected模式的relay UE。
实施方式A4：
在实施方式A4中，提供中继服务的relay UE保持在RRC_connected模式，如果 该relay UE进入RRC_idle或RRC_inactive模式，则不提供中继服务。
在实施方式A4中，网络设备可以不指示relay UE进入RRC_idle或RRC_inactive模式，例如，网络设备不会向有能力作为中继或将要作为中继的relay UE发送RRC release消息或带有挂起指示(Suspend indication)的RRC release消息，或者网络设备会接受该relay UE的RRC连接建立请求或RRC重建请求或RRC重新开始(Resume)请求等，即网络设备不拒绝relay UE的这些请求，以使该relay UE保持在RRC_connected模式；和/或，当relay UE处于RRC_idle或RRC_inactive模式时，该relay UE不向remote UE发送与发现(discovery)过程相关的消息，例如该relay UE不在边链路上发送下面消息中的至少一种：发现请求(discovery solicitation)消息、发现响应(discovery response)消息、直接通信请求(direct communication request)消息、直接通信接受(direct communication accept)消息和边链路系统信息(例如SL-MIB)，以防止remote UE发现该relay UE，或者，该relay UE不执行中继相关的功能，例如该relay UE在边链路上发送的发现请求(discovery solicitation)消息和/或发现响应(discovery response)消息和/或直接通信请求(direct communication request)消息和/或直接通信接受(direct communication accept)消息和/或边链路系统信息(例如SL-MIB)中，指示自己不执行中继相关的功能或不具有中继能力或不提供remote UE到网络的连接等。
根据第一方面的实施例，提供了使目标relay UE处于RRC_connected模式的方法，有助于采用现有direct-to-indirect path switch流程来进行remote UE与网络通信的路径的切换，使remote UE的业务中断时间较少；此外，第一方面的实施例的收发信号的方法简单，实现复杂度低。
第二方面的实施例
本申请第二方面的实施例用于解决上述Option 2中的问题，即，在直接到间接路径切换(direct-to-indirect path switch)的过程中，如果目标relay UE处于RRC_idle或RRC_inactive模式，那么该目标relay UE如何接收RRC reconfiguration消息。
图5是第二方面的实施例的收发信息的方法的另一个示意图。如图5所示，该收发信息的方法包括：
操作501、处于无线资源控制空闲(RRC_idle)模式或无线资源控制不激活 (RRC_inactive)模式的第二终端设备(relay UE)接收第一终端设备(remote UE)发送的无线资源控制重配置完成(RRC reconfiguration complete)消息，并且，进入无线资源控制连接(RRC_connected)模式；以及
操作502、该第二终端设备接收网络设备发送的无线资源控制重配置(RRC reconfiguration)消息，并且，进行PC5接口和Uu接口的中继相关配置。
在操作502中，对relay UE的RRC reconfiguration消息可以在relay UE进入RRC_connected模式后被发送，或者也可以在relay UE进入RRC_connected模式并向网络设备(例如，gNB)发送了该relay UE的L2 ID后被发送。
在第二方面的实施例中，relay UE可以通过例如边链路用户设备信息(Sidelink UE Information，SUI)消息向gNB发送该relay UE的L2 ID，目的是让gNB识别该进入RRC_connected模式的relay UE是remote UE的path switch的目标relay UE，以便后续向该目标relay UE发送RRC reconfiguration消息来进行PC5接口和Uu接口的相关配置。
其中，relay UE发送L2 ID(例如，通过SUI消息发送L2 ID)的条件或发起SUI过程的条件或发起SUI的目的可以包括该relay UE收到remote UE发送的RRC reconfiguration complete消息，例如，该RRC reconfiguration complete消息是remote UE经由该relay UE向网络设备发送的、或者该relay UE在PC5接口从remote UE收到SRB0承载的RRC reconfiguration complete消息，或者该relay UE在PC5接口从remote UE收到采用默认配置(或规定配置或预定义的配置)发送的RRC reconfiguration complete消息，该默认配置(或规定配置或预定义的配置)可以是默认的(或规定的或预定义的)边链路RLC承载配置，例如默认的(或规定的或预定义的)SL-RLC0配置或默认的SL-RLC1配置，该默认的(或规定的或预定义的)边链路RLC承载配置可以包括下面至少一种：SN域长度、重组时间、逻辑信道标识、逻辑信道优先级、优先的比特速率、逻辑信道组配置等。
图6是relay UE在RRC_idle或RRC_inactive模式情况下直接到间接路径切换的一个示意图。如图6所示，该路径切换过程包括如下的操作：
操作0.remote UE和网络设备(例如，gNB)之间通过Uu接口进行上行数据和/或下行数据(UL/DL data)的传输。
操作1a.gNB向remote UE发送测量配置(Measurement configuration)。
操作1b.remote UE在测量和/或发现候选的relay UE后，报告一个或多于一个候选的relay UE的ID；此外，remote UE还可以报告传统的Uu测量结果。
其中，remote UE可以至少报告relay UE ID、relay UE的服务小区ID和SL测量信息，其中SL测量信息可以是候选relay UE的边链路参考信号接收功率(sidelink-referencesignalreceivedpower，SL-RSRP)，如果SL-RSRP不可获得，则使用边链路发现参考信号接收功率(sidelink discovery-referencesignalreceivedpower，SD-RSRP)。
操作2.gNB决定将remote UE切换到目标relay UE。
操作3.gNB发送RRCReconfiguration消息给remote UE。该消息的内容可以至少包括Relay UE ID、relay业务的PC5RLC配置和相关的端到端无线承载(radio bearer)。Remote UE在收到gNB的RRCReconfiguration消息后停止用户面(user plane，UP)和控制面(control plane，CP)传输。
操作4.remote UE与目标relay UE建立PC5连接。
操作5.remote UE向目标relay UE发送无线资源控制重配置完成(RRCReconfigurationComplete)。
操作6.目标relay UE向gNB发送无线资源控制建立请求消息。例如，目标relay UE收到remote UE的RRC reconfiguration complete消息时，会触发该目标relay UE自己的RRC连接建立过程。
操作7.gNB向目标relay UE发送无线资源控制建立消息。
操作8.目标relay UE向gNB发送无线资源控制建立完成消息。
操作9.目标relay UE通过SUI消息指示该目标relay UE的UE标识(UE ID，例如是L2 ID或C-RNTI)以及remote UE的层2标识(L2 ID)。
操作10.gNB发送无线资源控制重配置(RRC reconfiguration)消息给目标relay UE，该消息中可以至少包括remote UE的本地标识(local ID)和层2标识(L2 ID)、Uu和PC5接口用于中继的RLC配置、以及承载映射配置。
操作11.目标relay UE发送无线资源控制重配置完成(RRC reconfiguration complete)消息给gNB。
操作12.目标relay UE将在操作5收到的由remote UE发送的无线资源控制重配置完成(RRC reconfiguration complete)消息转发给gNB，完成path switch过程。
操作13.remote UE和gNB之间的数据path被从direct path切换到indirect path， 即，remote UE通过目标relay UE与gNB进行上行数据和/或下行数据(UL and/or DL data)的传输。
在图6的操作3中，remote UE已经收到网络设备发送的RRC reconfiguration消息，能够进行PC5接口的SRAP和RLC channel等的相关配置，因此，在操作5中，remote UE在理论上可以在SRB1上发送RRC reconfiguration complete消息，并且该RRC reconfiguration complete消息在PC5接口会使用SRAP子层进行传输。但是，由于relay UE还没有接收网络设备发送的RRC reconfiguration消息来进行PC5接口和Uu接口的相关配置(包括PC5接口的SRAP配置和RLC channel配置等)，例如relay UE在PC5接口可能还没有建立或配置SRAP实体和/或RLC channel，因此，如果remote UE使用SRAP子层发送RRC reconfiguration complete消息，relay UE就无法正确接收该RRC reconfiguration complete消息。
所以，在图6的操作5中，为了确保目标relay UE能够正确接收remote UE发送的RRC reconfiguration complete消息，remote UE的RRC reconfiguration complete消息的发送在PC5接口可以不使用SRAP相关的功能或者SRAP不出现，或者，remote UE的RRC reconfiguration complete消息可以使用SRB0发送，或者remote UE可以使用默认配置发送RRC reconfiguration complete消息，该默认配置(或规定配置或预定义的配置)可以是前述的默认的(或规定的或预定义的)边链路RLC承载配置等。
通过第二方面的实施例的收发信息的方法，原本处于RRC_idle模式或RRC_inactive模式的relay UE在进入RRC_connected模式并作为目标relay UE的情况下，可以正确接收remote UE在PC5接口发送的RRC reconfiguration complete消息，并保证remote UE成功完成从直接路径切换到通过RRC_connected的relay UE与网络通信。
第三方面的实施例
第三方面的实施例提供一种收发信息的装置。应用于网络设备，例如，图1的网络设备100。该收发信息的装置的功能与第一方面的实施例中网络设备的方法对应。
图7是第三方面的实施例所述的收发信息的装置的一个示意图。如图7所示，收发信息的装置700包括第一收发单元701，第一收发单元701被配置为：
接收第一终端设备(例如，remote UE)发送的候选第二终端设备(relay UE)的 信息；
向第一终端设备发送无线资源控制重配置(RRC reconfiguration)消息，该无线资源控制重配置(RRC reconfiguration)消息包括处于无线资源控制连接(RRC_connected)模式的目标第二终端设备(例如，目标relay UE)的信息；以及
通过该目标第二终端设备与第一终端设备通信。
通过第三方面的实施例，能够使目标第二终端设备处于RRC_connected模式，有助于采用现有direct-to-indirect path switch流程来进行remote UE与网络通信的路径的切换，使remote UE的业务中断时间较少；此外，实现的方法，实现复杂度低。
对应于第一方面的实施例的实施方式A1，第一收发单元701可以根据第一终端设备发送的候选第二终端设备(例如，候选relay UE)的信息选择处于无线资源控制连接(RRC_connected)模式的候选第二终端设备，作为目标第二终端设备。
在一个实施方例中，第一收发单元701接收进入无线资源控制连接(RRC_connected)模式的第二终端设备发送的标识信息，例如，该标识信息是层2标识(L2 L2 ID)。第一收发单元701基于该标识信息和第一终端设备发送的候选第二终端设备(例如，候选relay UE)的信息选择处于无线资源控制连接(RRC_connected)模式的候选第二终端设备。
例如，候选第二终端设备(例如，候选relay UE)在进入RRC_connected模式后向gNB报告自己的L2 ID或者该候选relay UE在自己的L2 ID发生改变时向gNB报告自己改变的L2 ID，该L2 ID可以是该候选relay UE中的上层(例如V2X层或ProSe层或NAS层)分配的标识，例如为24比特，该L2 ID可以是该候选relay UE的用于中继业务的L2 ID；此外，该候选relay UE还可以向gNB(例如，gNB的第一收发单元701)报告自己的中继能力(例如L2 UE-to-Network中继相关的能力)等，这样，gNB可以获得哪些L2 ID的relay UE处于RRC_connected模式；在gNB收到remote UE测量报告中的候选relay UE的L2 ID时，根据进入RRC_connected模式后的relay UE向gNB报告的该relay UE的L2 ID，从候选relay UE中选择RRC_connected模式的relay UE作为该remote UE切换路径的目标relay UE。
在另一个实施例中，网络设备可以分配第二终端设备的标识信息，例如，该标识信息是小区无线网络临时标识(C-RNTI)。该第一收发单元701可以基于该标识信息和第一终端设备发送的候选第二终端设备(例如，候选relay UE)的信息选择处于无 线资源控制连接(RRC_connected)模式的候选第二终端设备。
在该标识信息是小区无线网络临时标识(C-RNTI)的情况下，第二终端设备可以将该第二终端设备的标识信息发送给第一终端设备。
对应于第一方面的实施例的实施方式A2，第一收发单元701可以接收第一终端设备发送的处于无线资源控制连接(RRC_connected)模式的候选第二终端设备(relay UE)的信息。
对应于第一方面的实施例的实施方式A3，第一收发单元701还可以被配置为：向第一终端设备发送用于指示处于连接模式的第二终端设备的指示信息。由此，该第一终端设备可以基于该指示信息，对处于连接模式的第二终端设备进行测量，并且，第一收发单元701可以接收第一终端设备基于测量的结果发送的处于连接模式的候选第二终端设备(relay UE)的信息。
对应于第一方面的实施例的实施方式A4，对于处于无线资源控制连接(RRC_connected)模式的目标第二终端设备，该第一收发单元701不指示该目标第二终端设备进入非连接模式。例如，第一收发单元701不会向有能力作为中继或将要作为中继的relay UE发送RRC release消息或带有挂起指示(Suspend indication)的RRC release消息，或者第一收发单元701会接受该relay UE的RRC连接建立请求或RRC重建请求或RRC重新开始(Resume)请求等，即，第一收发单元701不拒绝relay UE的这些请求，以使该relay UE保持在RRC_connected模式。
第四方面的实施例
第四方面的实施例提供一种收发信息的装置。应用于第一终端设备，例如，图1的remote UE 101。该收发信息的装置的功能与第一方面的实施例中remote UE的方法对应。
图8是第四方面的实施例所述的收发信息的装置的一个示意图。如图8所示，收发信息的装置800包括第二收发单元801，第二收发单元801被配置为：
向网络设备发送候选第二终端设备(例如，候选relay UE)的信息；
接收该网络设备发送的无线资源控制重配置(RRC reconfiguration)消息，该无线资源控制重配置(RRC reconfiguration)消息包括处于无线资源控制连接(RRC_connected)模式的目标第二终端设备(relay UE)的信息；以及
通过该目标第二终端设备与网络设备通信。
通过第四方面的实施例，能够使目标第二终端设备处于RRC_connected模式，有助于采用现有direct-to-indirect path switch流程来进行remote UE与网络通信的路径的切换，使remote UE的业务中断时间较少；此外，实现的方法，实现复杂度低。
对应于第一方面的实施例的实施方式A2，第二收发单元801向网络设备发送处于无线资源控制连接(RRC_connected)模式的候选第二终端设备(例如，候选relay UE)的信息。
该第二收发单元801还被配置为：接收第二终端设备发送的用于指示该第二终端设备的RRC模式的指示信息。由此，该第二收发单元801能够基于该指示信息向网络设备发送处于无线资源控制连接(RRC_connected)模式的候选第二终端设备(relay UE)的信息。例如，relay UE向第二收发单元801发送的指示可以通过PC5-S消息或PC5-RRC消息或边链路系统信息或边链路媒体接入控制控制元素(Sidelink MAC CE)等发送。其中，PC5-S消息可以是发现请求(discovery solicitation)消息或发现响应(discovery response)消息或直接通信请求(direct communication request)消息或直接通信接受(direct communication accept)消息等；PC5-RRC消息可以是边链路通知消息(NotificationMessageSidelink)或边链路转移Uu消息(UuMessageTransferSidelink)等；边链路系统信息可以是边链路主信息块(SL-MIB，MasterInformationBlockSidelink)等；边链路MAC CE可以是具有一个字节长度的MAC CE等。
对应于第一方面的实施例的实施方式A3，第二收发单元801还可以被配置为：
接收该网络设备发送的用于指示处于连接模式的第二终端设备的指示信息；以及
基于该指示信息，对处于连接模式的第二终端设备进行测量。
由此，第二收发单元801可以基于上述测量的结果向网络设备发送处于连接模式的候选第二终端设备(例如，候选relay UE)的信息。
第五方面的实施例
第五方面的实施例提供一种收发信息的装置。应用于第二终端设备，例如，图1的relay UE 102。该收发信息的装置的功能与第一方面的实施例中实施方式A4的relay UE的方法对应。
图9是第五方面的实施例所述的收发信息的装置的一个示意图。如图9所示，收发信息的装置900包括第三收发单元901，第三收发单元901被配置为：
在该第二终端设备没有处于无线资源控制连接(RRC_connected)模式的情况下(例如，处于RRC_idle或RRC_inactive模式)，该第三收发单元901不发送与发现(discovery)过程相关的消息或不执行中继相关的功能。
其中，第三收发单元901不发送与发现(discovery)过程相关的消息或不执行中继相关的功能，例如包括：该第三收发单元901不在边链路上发送下面消息中的至少一种：发现请求(discovery solicitation)消息、发现响应(discovery response)消息、直接通信请求(direct communication request)消息、直接通信接受(direct communication accept)消息和边链路系统信息(例如SL-MIB)，以防止remote UE发现该relay UE。该第三收发单元901不执行中继相关的功能，例如包括：该第三收发单元901在边链路上发送的发现请求(discovery solicitation)消息和/或发现响应(discovery response)消息和/或直接通信请求(direct communication request)消息和/或直接通信接受(direct communication accept)消息和/或边链路系统信息(例如SL-MIB)中，指示自己不执行中继相关的功能或不具有中继能力或不提供remote UE到网络的连接等。
由此，能够避免没有处于无线资源控制连接(RRC_connected)模式的relay UE被remote UE发现，或者，避免该relay UE为remote UE提供中继服务。
第六方面的实施例
第六方面的实施例提供一种收发信息的装置。应用于网络设备，例如，图1的网络设备100。该收发信息的装置的功能与第二方面的实施例中网络设备的方法对应。
图10是第六方面的实施例所述的收发信息的装置的一个示意图。如图10所示，收发信息的装置1000包括第四收发单元1001，第四收发单元1001被配置为：
在第二终端设备进入无线资源控制连接(RRC_connected)模式的情况下，第四收发单元1001向第二终端设备发送无线资源控制重配置(RRC reconfiguration)消息，使该第二终端设备进行PC5接口和Uu接口的中继相关配置。
在至少一个实施例中，第四收发单元1001还被配置为：接收第二终端设备发送的标识信息。例如，第四收发单元1001通过边链路终端设备信息(Sidelink UE Information，SUI)消息从第二终端设备接收标识信息。该标识信息例如可以是该第 二终端设备的L2 ID。
在至少一个实施例中，第四收发单元101在发送无线资源控制重配置(RRC reconfiguration)消息(例如，图6的操作10)之前，通过边链路终端设备信息(Sidelink UE Information，SUI)消息从第二终端设备接收该标识信息(例如，图6的操作9)。
通过第六方面的实施例，原本处于RRC_idle模式或RRC_inactive模式的relay UE在进入RRC_connected模式并作为目标relay UE的情况下，可以正确接收remote UE在PC5接口发送的RRC reconfiguration complete消息，并保证remote UE成功完成从直接路径切换到通过RRC_connected的relay UE与网络通信。
第七方面的实施例
第七方面的实施例提供一种收发信息的装置。应用于第二终端设备，例如，图1的relay UE 102。该收发信息的装置的功能与第二方面的实施例中第二终端设备(例如，relay UE)的方法对应。
图11是第七方面的实施例所述的收发信息的装置的一个示意图。如图11所示，收发信息的装置1100包括第五收发单元1101，第五收发单元1101被配置为：
在第二终端设备处于无线资源控制空闲(RRC_idle)模式或无线资源控制不激活(RRC_inactive)模式时，第五收发单元1101接收第一终端设备(remote UE)发送的无线资源控制重配置完成(RRC reconfiguration complete)消息，并且，使第二终端设备进入无线资源控制连接(RRC_connected)模式；以及
接收网络设备发送的无线资源控制重配置(RRC reconfiguration)消息，并且，使第二终端设备进行PC5接口和Uu接口的中继相关配置。
在至少一个实施例中，第五收发单元1101还可以被配置为：向网络设备发送标识信息。该标识信息例如是该第二终端设备的L2 ID。
其中，第五收发单元1101可以通过边链路终端设备信息(Sidelink UE Information，SUI)消息向网络设备发送该标识信息。
第五收发单元1101发送该标识信息的条件或发起SUI过程的条件或发起SUI的目的可以包括：该第二终端设备收到第一终端设备发送的无线资源控制重配置完成(RRC reconfiguration complete)消息。例如，该RRC reconfiguration complete消息是第一终端设备(例如，remote UE)经由该第二终端设备(例如，relay UE)向网络设 备发送的，或者该第五收发单元1101在PC5接口从第一终端设备收到的SRB0承载该无线资源控制重配置完成(RRC reconfiguration complete)消息，或者，第五收发单元1101可以在PC5接口从第一终端设备收到采用默认配置发送的该无线资源控制重配置完成(RRC reconfiguration complete)消息，该默认配置(或规定配置或预定义的配置)可以是默认的(或规定的或预定义的)边链路RLC承载配置，例如默认的(或规定的或预定义的)SL-RLC0配置或默认的(或规定的或预定义的)SL-RLC1配置，该默认的(或规定的或预定义的)边链路RLC承载配置可以包括下面至少一种：SN域长度、重组时间、逻辑信道标识、逻辑信道优先级、优先的比特速率、逻辑信道组配置等。
在至少一个实施例中，在向网络设备发送该标识信息后，第五收发单元1101从网络设备接收无线资源控制重配置(RRC reconfiguration)消息。
通过第六方面的实施例，原本处于RRC_idle模式或RRC_inactive模式的relay UE在进入RRC_connected模式并作为目标relay UE的情况下，可以正确接收remote UE在PC5接口发送的RRC reconfiguration complete消息，并保证remote UE成功完成从直接路径切换到通过RRC_connected的relay UE与网络通信。
第八方面的实施例
本申请实施例还提供一种通信系统，该通信系统可以包括第一终端设备、第二终端设备和网络设备，例如，第一终端设备可以是图1的remote UE 101，第二终端设备可以是图1的relay UE 102，网络设备可以是图1的网络设备100。其中，第一终端设备和第二终端设备可以采用类似的终端设备的结构。
图12是第八方面的实施例的通信系统中的终端设备的示意图。图12所示的终端设备可以用于第一终端设备，也可以用于第二终端设备。
如图12所示，终端设备1200可以包括：处理器1210(例如中央处理器CPU)和存储器1220；存储器1220耦合到处理器1210。其中该存储器1220可存储各种数据；此外还存储信息处理的程序1230，并且在处理器1210的控制下执行该程序1230。
例如，处理器1210可以被配置为执行程序而实现如第一方面、或第二方面的实施例所述的方法。
此外，如图12所示，终端设备1200还可以包括：收发机1240和天线1250等； 其中，上述部件的功能与现有技术类似，此处不再赘述。值得注意的是，终端设备1200也并不是必须要包括图12中所示的所有部件；此外，终端设备1200还可以包括图12中没有示出的部件，可以参考现有技术。
图13是第八方面的实施例的通信系统中的网络设备的示意图。
如图13所示，网络设备1300可以包括：处理器1310(例如中央处理器CPU)和存储器1320；存储器1320耦合到处理器1310。其中该存储器1320可存储各种数据；此外还存储信息处理的程序1330，并且在处理器1310的控制下执行该程序1330。
例如，处理器1310可以被配置为执行程序而实现如第一方面、或第二方面的实施例所述的方法。
此外，如图13所示，网络设备1300还可以包括：收发机1340和天线1350等；其中，上述部件的功能与现有技术类似，此处不再赘述。值得注意的是，网络设备1300也并不是必须要包括图13中所示的所有部件；此外，网络设备1300还可以包括图13中没有示出的部件，可以参考现有技术。
本申请实施例还提供一种计算机程序，其中当在第一终端设备或第二终端设备中执行所述程序时，所述程序使得所述第一终端设备或第二终端设备执行第一、二方面的实施例所述的方法。
本申请实施例还提供一种存储有计算机程序的存储介质，其中所述计算机程序使得第一终端设备或第二终端设备执行第一、二方面的实施例所述的方法。
本申请实施例还提供一种计算机程序，其中当在网络设备中执行所述程序时，所述程序使得所述网络设备执行第一、二方面的实施例所述的方法。
本申请实施例还提供一种存储有计算机程序的存储介质，其中所述计算机程序使得网络设备执行第一、二方面的实施例所述的方法。
本申请以上的装置和方法可以由硬件实现，也可以由硬件结合软件实现。本申请涉及这样的计算机可读程序，当该程序被逻辑部件所执行时，能够使该逻辑部件实现上文所述的装置或构成部件，或使该逻辑部件实现上文所述的各种方法或步骤。本申请还涉及用于存储以上程序的存储介质，如硬盘、磁盘、光盘、DVD、flash存储器等。
结合本申请实施例描述的方法/装置可直接体现为硬件、由处理器执行的软件模块或二者组合。例如，图中所示的功能框图中的一个或多个和/或功能框图的一个或多个组合，既可以对应于计算机程序流程的各个软件模块，亦可以对应于各个硬件模 块。这些软件模块，可以分别对应于图中所示的各个步骤。这些硬件模块例如可利用现场可编程门阵列(FPGA)将这些软件模块固化而实现。
软件模块可以位于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、移动磁盘、CD-ROM或者本领域已知的任何其它形式的存储介质。可以将一种存储介质耦接至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息；或者该存储介质可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。该软件模块可以存储在移动终端的存储器中，也可以存储在可插入移动终端的存储卡中。例如，若设备(如移动终端)采用的是较大容量的MEGA-SIM卡或者大容量的闪存装置，则该软件模块可存储在该MEGA-SIM卡或者大容量的闪存装置中。
针对附图中描述的功能方框中的一个或多个和/或功能方框的一个或多个组合，可以实现为用于执行本申请所描述功能的通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其它可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件或者其任意适当组合。针对附图描述的功能方框中的一个或多个和/或功能方框的一个或多个组合，还可以实现为计算设备的组合，例如，DSP和微处理器的组合、多个微处理器、与DSP通信结合的一个或多个微处理器或者任何其它这种配置。
以上结合具体的实施方式对本申请进行了描述，但本领域技术人员应该清楚，这些描述都是示例性的，并不是对本申请保护范围的限制。本领域技术人员可以根据本申请的精神和原理对本申请做出各种变型和修改，这些变型和修改也在本申请的范围内。
关于包括以上实施例的实施方式，还公开下述的附记：
1.一种收发信息的方法，应用于网络设备，所述方法包括：
接收第一终端设备发送的候选第二终端设备(relay UE)的信息；
向所述第一终端设备发送无线资源控制重配置(RRC reconfiguration)消息，所述无线资源控制重配置(RRC reconfiguration)消息包括处于无线资源控制连接(RRC_connected)模式的目标第二终端设备(relay UE)的信息；以及
所述网络设备通过所述目标第二终端设备与所述第一终端设备通信。
2.如附记1所述的方法，其中，
所述网络设备根据所述第一终端设备发送的所述候选第二终端设备(relay UE)的信息选择处于无线资源控制连接(RRC_connected)模式的候选第二终端设备，作为所述目标第二终端设备。
3.如附记1或2所述的方法，其中，
所述网络设备接收进入无线资源控制连接(RRC_connected)模式的第二终端设备发送的标识信息，
所述网络设备基于所述标识信息和所述第一终端设备发送的所述候选第二终端设备(relay UE)的信息选择处于无线资源控制连接(RRC_connected)模式的候选第二终端设备。
4.如附记3所述的方法，其中，
所述标识信息是层2(L2)标识信息
5.如附记1或2所述的方法，其中，
所述网络设备分配第二终端设备的标识信息，
所述网络设备基于所述标识和所述第一终端设备发送的所述候选第二终端设备(relay UE)的信息选择处于无线资源控制连接(RRC_connected)模式的候选第二终端设备。
6.如附记5所述的方法，其中，
所述标识信息是小区无线网络临时标识(C-RNTI)。
7.如附记6所述的方法，其中，
在所述标识信息是小区无线网络临时标识(C-RNTI)时，所述第一终端设备接收第二终端设备发送的所述标识信息。
8.如附记1所述的方法，其中，
所述网络设备接收所述第一终端设备发送的处于无线资源控制连接(RRC_connected)模式的候选第二终端设备(relay UE)的信息。
8a.如附记1所述的方法，其中，
所述方法还包括：
所述网络设备向所述第一终端设备发送用于指示处于连接模式的第二终端设备的指示信息，
其中，所述第一终端设备基于所述指示信息，对处于连接模式的第二终端设备进 行测量，
所述网络设备接收所述第一终端设备基于所述测量的结果发送的候选第二终端设备(relay UE)的信息。
9.如附记1所述的方法，其中，
对于处于无线资源控制连接(RRC_connected)模式的目标第二终端设备，所述网络设备不指示该目标第二终端设备进入非连接模式。
10.一种收发信息的方法，应用于第二终端设备，所述方法包括：
在没有处于无线资源控制连接(RRC_connected)模式的情况下，所述第二终端设备不发送与发现过程相关的消息或不执行中继相关的功能。
11.一种收发信息的方法，应用于第一终端设备(remote UE)，所述方法包括：
向网络设备发送候选第二终端设备(relay UE)的信息；
接收所述网络设备发送的无线资源控制重配置(RRC reconfiguration)消息，所述无线资源控制重配置(RRC reconfiguration)消息包括处于无线资源控制连接(RRC_connected)模式的目标第二终端设备(relay UE)的信息；以及
所述第一终端设备通过所述目标第二终端设备与所述网络设备通信。
12.如附记11所述的方法，其中，
所述第一终端设备向所述网络设备发送处于无线资源控制连接(RRC_connected)模式的候选第二终端设备(relay UE)的信息。
13.如附记12所述的方法，其中，
所述方法还包括：
所述第一终端设备接收第二终端设备发送的用于指示所述第二终端设备的RRC模式的指示信息，
所述第一终端设备基于所述指示信息向所述网络设备发送处于无线资源控制连接(RRC_connected)模式的候选第二终端设备(relay UE)的信息。
14.如附记11所述的方法，其中，
所述方法还包括：
所述第一终端设备接收所述网络设备发送的用于指示处于连接模式的第二终端设备的指示信息；以及
所述第一终端设备基于所述指示信息，对处于连接模式的第二终端设备进行测量，
所述第一终端设备基于所述测量的结果向网络设备发送候选第二终端设备(relay UE)的信息。
15.一种收发信息的方法，应用于网络设备，所述方法包括：
在第二终端设备进入无线资源控制连接(RRC_connected)模式的情况下，
向所述第二终端设备发送无线资源控制重配置(RRC reconfiguration)消息，使所述第二终端设备进行PC5接口和Uu接口的中继相关配置。
16.如附记15所述的方法，其中，所述方法还包括：
接收所述第二终端设备发送的标识信息。
17.如附记16所述的方法，其中，
所述网络设备通过边链路终端设备信息(Sidelink UE Information，SUI)消息从所述第二终端设备接收所述标识信息。
18.如附记16所述的方法，其中，
所述网络设备在发送所述无线资源控制重配置(RRC reconfiguration)消息之前，通过边链路终端设备信息(Sidelink UE Information，SUI)消息从所述第二终端设备接收所述标识信息。
19.一种收发信息的方法，应用于第二终端设备(relay UE)，所述方法包括：
处于无线资源控制空闲(RRC_idle)模式或无线资源控制不激活(RRC_inactive)模式的所述第二终端设备接收第一终端设备(remote UE)发送的无线资源控制重配置完成(RRC reconfiguration complete)消息，并且，进入无线资源控制连接(RRC_connected)模式；以及
接收网络设备发送的无线资源控制重配置(RRC reconfiguration)消息，并且，进行PC5接口和Uu接口的中继相关配置。
20.如附记19所述的方法，其中，所述方法还包括：
所述第二终端设备向所述网络设备发送标识信息。
21.如附记20所述的方法，其中，
所述第二终端设备在向所述网络设备发送标识信息后，接收所述无线资源控制重配置(RRC reconfiguration)消息。
22.如附记20所述的方法，其中，
所述第二终端设备通过边链路终端设备信息(Sidelink UE Information，SUI)消 息向所述网络设备发送所述标识信息。
23.如附记20所述的方法，其中，
所述第二终端设备发送所述标识信息的条件包括：收到所述第一终端设备发送的所述无线资源控制重配置完成(RRC reconfiguration complete)消息。
24.如附记23所述的方法，其中，
所述无线资源控制重配置完成消息是所述第一终端设备经由所述第二终端设备向网络设备发送的；或者，
所述第二终端设备在PC5接口从所述第一终端设备收到的SRB0承载所述无线资源控制重配置完成(RRC reconfiguration complete)消息；或者
所述第二终端设备在PC5接口从所述第一终端设备收到采用默认配置发送的所述无线资源控制重配置完成(RRC reconfiguration complete)消息。

Claims (20)

  1. 一种收发信息的装置，应用于网络设备，所述装置包括第一收发单元，所述第一收发单元被配置为：
    接收第一终端设备发送的候选第二终端设备的信息；
    向所述第一终端设备发送无线资源控制重配置消息，所述无线资源控制重配置消息包括处于无线资源控制连接模式的目标第二终端设备的信息；以及
    所述通过所述目标第二终端设备与所述第一终端设备通信。
  2. 如权利要求1所述的装置，其中，
    所述第一收发单元根据所述第一终端设备发送的所述候选第二终端设备的信息选择处于无线资源控制连接模式的候选第二终端设备，作为所述目标第二终端设备。
  3. 如权利要求1或2所述的装置，其中，
    所述第一收发单元接收进入无线资源控制连接模式的第二终端设备发送的标识信息，
    所述第一收发单元基于所述标识信息和所述第一终端设备发送的所述候选第二终端设备的信息选择处于无线资源控制连接模式的候选第二终端设备。
  4. 如权利要求3所述的装置，其中，
    所述标识信息是层2标识信息。
  5. 如权利要求1或2所述的装置，其中，
    所述网络设备分配第二终端设备的标识信息，
    所述第一收发单元基于所述标识信息和所述第一终端设备发送的所述候选第二终端设备的信息选择处于无线资源控制连接模式的候选第二终端设备。
  6. 如权利要求5所述的装置，其中，
    所述标识信息是小区无线网络临时标识。
  7. 如权利要求6所述的装置，其中，
    在所述标识信息是小区无线网络临时标识时，所述第一终端设备接收第二终端设备发送的所述标识信息。
  8. 如权利要求1所述的装置，其中，
    所述第一收发单元接收所述第一终端设备发送的处于无线资源控制连接模式的 候选第二终端设备的信息。
  9. 如权利要求1所述的装置，其中，
    所述第一收发单元还被配置为：
    向所述第一终端设备发送用于指示处于连接模式的第二终端设备的指示信息，
    其中，所述第一终端设备基于所述指示信息，对处于连接模式的第二终端设备进行测量，
    所述第一收发单元接收所述第一终端设备基于所述测量的结果发送的候选第二终端设备的信息。
  10. 如权利要求1所述的装置，其中，
    对于处于无线资源控制连接模式的目标第二终端设备，所述第一收发单元不指示该目标第二终端设备进入非连接模式。
  11. 一种收发信息的装置，应用于第一终端设备，所述装置包括第二收发单元，所述第二收发单元被配置为：
    向网络设备发送候选第二终端设备的信息；
    接收所述网络设备发送的无线资源控制重配置消息，所述无线资源控制重配置消息包括处于无线资源控制连接模式的目标第二终端设备的信息；以及
    通过所述目标第二终端设备与所述网络设备通信。
  12. 如权利要求11所述的装置，其中，
    所述第二收发单元向所述网络设备发送处于无线资源控制连接模式的候选第二终端设备的信息。
  13. 如权利要求12所述的装置，其中，
    所述第二收发单元还被配置为：
    接收第二终端设备发送的用于指示所述第二终端设备的RRC模式的指示信息，
    所述第二收发单元基于所述指示信息向所述网络设备发送处于无线资源控制连接模式的候选第二终端设备的信息。
  14. 如权利要求11所述的装置，其中，
    所述第二收发单元还被配置为：
    接收所述网络设备发送的用于指示处于连接模式的第二终端设备的指示信息；以及
    基于所述指示信息，对处于连接模式的第二终端设备进行测量，
    所述第二收发单元基于所述测量的结果向网络设备发送候选第二终端设备的信息。
  15. 一种收发信息的装置，应用于第二终端设备，所述装置包括第五收发单元，所述第五收发单元被配置为：
    在所述第二终端设备处于无线资源控制空闲模式或无线资源控制不激活模式时，所述第五收发单元接收第一终端设备发送的无线资源控制重配置完成消息，并且，使所述第二终端设备进入无线资源控制连接模式；以及
    接收网络设备发送的无线资源控制重配置消息，并且，使所述第二终端设备进行PC5接口和Uu接口的中继相关配置。
  16. 如权利要求15所述的装置，其中，所述第五收发单元还被配置为：
    向所述网络设备发送标识信息。
  17. 如权利要求16所述的装置，其中，
    在向所述网络设备发送所述标识信息后，所述第五收发单元接收所述无线资源控制重配置消息。
  18. 如权利要求16所述的装置，其中，
    所述第五收发单元通过边链路终端设备信息消息向所述网络设备发送所述标识信息。
  19. 如权利要求16所述的装置，其中，
    所述第五收发单元发送所述标识信息的条件包括：所述第二终端设备收到所述第一终端设备发送的所述无线资源控制重配置完成消息。
  20. 如权利要求19所述的装置，其中，
    该所述无线资源控制重配置完成消息是所述第一终端设备经由该第二终端设备向网络设备发送的；或者
    所述第五收发单元在PC5接口从所述第一终端设备收到的SRB0承载所述无线资源控制重配置完成消息；或者
    所述第五收发单元在PC5接口从所述第一终端设备收到采用默认配置发送的所述无线资源控制重配置完成消息。
PCT/CN2022/070786 2022-01-07 2022-01-07 收发信息的方法、装置和通信系统 WO2023130368A1 (zh)

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