WO2020164613A1 - 中继通信的方法和装置 - Google Patents

中继通信的方法和装置 Download PDF

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Publication number
WO2020164613A1
WO2020164613A1 PCT/CN2020/075349 CN2020075349W WO2020164613A1 WO 2020164613 A1 WO2020164613 A1 WO 2020164613A1 CN 2020075349 W CN2020075349 W CN 2020075349W WO 2020164613 A1 WO2020164613 A1 WO 2020164613A1
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WO
WIPO (PCT)
Prior art keywords
terminal device
access network
data
relay
network device
Prior art date
Application number
PCT/CN2020/075349
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English (en)
French (fr)
Inventor
罗海燕
戴明增
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP20756650.6A priority Critical patent/EP3913974A4/en
Publication of WO2020164613A1 publication Critical patent/WO2020164613A1/zh
Priority to US17/400,780 priority patent/US20210377834A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/23—Manipulation of direct-mode connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/03—Reselecting a link using a direct mode connection
    • H04W36/033—Reselecting a link using a direct mode connection in pre-organised networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • This application relates to the field of communication, and more specifically, to a method and device for relay communication.
  • the cell handover of the first terminal device is mainly based on the control of radio resource control (Radio Resource Control, RRC) messages of the access network device.
  • RRC Radio Resource Control
  • the first terminal device when it is moving, it sends the signal quality of the target cell detected by the first terminal device to the wireless access network device, and the wireless access network device determines whether it needs to proceed according to the signal quality of the target cell and other factors.
  • Cell handover When a handover is required, an RRC message is sent to the first terminal device, and the RRC message may carry the identity of the target cell to which the first terminal device will be handed over.
  • the wireless access network device can communicate to the first terminal device through the other terminal devices. Send an RRC message to indicate the target relay device to be handed over.
  • the second terminal device is the terminal device that currently provides relay services between the first terminal device and the wireless access network device
  • the third terminal device is potentially a medium that provides intermediate services between the first terminal device and the wireless access network device. Following the service terminal equipment.
  • the first terminal device suddenly moves from the coverage area of the second terminal device to the coverage area of the third terminal device, or the signal quality between the second terminal device and the wireless access network device deteriorates, or even a wireless link occurs If it fails, the first terminal device may not be able to receive the RRC message sent by the wireless access network device through the second terminal device, and the relay device will not be switched, thereby enabling the first terminal device to communicate with the wireless access network device Interruption or reduced communication efficiency.
  • the present application provides a method and device for relay communication, which can improve communication efficiency.
  • a relay communication method includes: a first terminal device receives instruction information from a second terminal device, the instruction information is used to instruct to stop providing the first terminal device and the wireless access network device. The first terminal device sends notification information to the wireless access network device through the relay service of the third terminal device, and the notification information indicates that the first terminal device is connected to the wireless access network device through the third terminal device. Wireless access network equipment.
  • the first terminal device receives instruction information from the second terminal device instructing the second terminal device to stop providing relay services for the first terminal device and the wireless access network device, and sends a notification to the wireless access network device through the third terminal device.
  • the information informs the wireless access network device that the first terminal device is connected to the wireless access network device through the relay service of the third terminal device, so that the wireless access network device can communicate with the first terminal device through the third terminal device Therefore, it is avoided that the first terminal device suddenly finds that the second terminal device cannot perform relay, which causes the communication between the first terminal device and the wireless access network device to be interrupted, and the communication efficiency is improved.
  • the indication information indicates that the signal quality between the second terminal device and the radio access network device is less than or equal to a preset quality threshold.
  • the indication information may indirectly instruct the second terminal device to stop serving as the first terminal device and the wireless access network device through the signal quality between the second terminal device and the wireless access network device being less than or equal to the preset quality threshold.
  • a relay service is provided between devices. The embodiment of the present application provides an indication method to improve the flexibility of indication.
  • the indication information indicates that a radio link failure occurs between the second terminal device and the radio access network device.
  • the indication information can indirectly instruct the second terminal device to stop providing intermediate services between the first terminal device and the wireless access network device through a wireless link failure between the second terminal device and the wireless access network device.
  • the embodiment of this application provides another indication method to improve the flexibility of indication.
  • the indication information further indicates the identity of the third terminal device
  • the method further includes: the first terminal device determines the third terminal device according to the identity of the third terminal device.
  • the indication information may also indicate the identity of the third terminal device, so that the first terminal device can determine the terminal device (that is, the third terminal device) that can currently perform relay services for the first terminal device and the wireless access network device , And then send notification information to the wireless access network device through the third terminal device, so that the wireless access network device can communicate with the first terminal device through the third terminal device, thereby preventing the first terminal device from suddenly discovering the second terminal device.
  • the terminal device cannot perform relay, which causes the communication between the first terminal device and the wireless access network device to be interrupted, and the communication efficiency is improved.
  • the notification information also indicates the identity of the first terminal device.
  • the notification information may also indicate the identity of the first terminal device, so that the wireless access network device can learn from the identity that the relay device between the first terminal devices corresponding to the identity has switched, so that the first terminal device has switched.
  • the wireless access network device can accurately know which first terminal device sent the notification information, and when the first terminal device communicates, the switched relay device is used , Improve the communication efficiency.
  • the method further includes: the first terminal device sends the identifier of the third terminal device to the second terminal device.
  • the first terminal device may also send the identity of the third terminal device to the second terminal device, and It is helpful to forward the data of the first terminal device through the third terminal device when the data of the first terminal device is not completely forwarded, so as to avoid data loss of the first terminal device and improve signal quality.
  • a method for relay communication includes: a second terminal device generates instruction information for instructing to stop providing as a relay between the first terminal device and the radio access network device Service; the second terminal device sends the instruction information to the first terminal device.
  • the second terminal device generates instruction information instructing the second terminal device to stop providing relay services for the first terminal device and the wireless access network device, and sends the instruction information to the third terminal device so that the third terminal device follows the instruction
  • the information sends notification information to the wireless access network device to notify the wireless access network device that the first terminal device accesses the wireless access network device through the third terminal device, so that the wireless access network device can communicate with the wireless access network device through the third terminal device.
  • a terminal device communicates, thereby avoiding that the first terminal device suddenly discovers that the second terminal device cannot perform relaying, which causes the communication between the first terminal device and the wireless access network device to be interrupted, thereby improving communication efficiency.
  • the indication information indicates that the signal quality between the second terminal device and the radio access network device is less than a preset threshold.
  • the indication information may indirectly instruct the second terminal device to stop serving as the first terminal device and the wireless access network device through the signal quality between the second terminal device and the wireless access network device being less than or equal to the preset quality threshold.
  • a relay service is provided between devices. The embodiment of the present application provides an indication method to improve the flexibility of indication.
  • the indication information indicates that a radio link failure occurs between the second terminal device and the radio access network device.
  • the indication information can indirectly instruct the second terminal device to stop providing intermediate services between the first terminal device and the wireless access network device through a wireless link failure between the second terminal device and the wireless access network device.
  • the embodiment of this application provides another indication method to improve the flexibility of indication.
  • the method further includes: the second terminal device sends the data to be sent of the first terminal device to a third terminal device, and the third terminal device is currently the first terminal device and the wireless A device that provides a relay service for an access network device, and the second terminal device is a device that previously provided a relay service for the first terminal device and the wireless access network device.
  • the second terminal device sends the to-be-sent data of the first terminal device to the third terminal device, which is helpful for forwarding through the third terminal device when the data of the first terminal device is not completed, so as to avoid the The data of the first terminal device is lost, which improves the signal quality.
  • the second terminal device sending the data to be sent of the first terminal device to the third terminal device includes: the second terminal device sends a first message, and the first message includes the data to be sent, And the first message also includes the identifier of the first terminal device, the identifier of the first channel, and transmission direction indication information, and the first channel is used for communication between the first terminal device and the radio access network device.
  • the second terminal device may carry the data of the first terminal device through the first message, and the first message may also carry the identification of the first terminal device, the identification of the first channel, and the transmission direction indication information, so that the third terminal device It can be known that the data carried in the first message is data belonging to the first terminal device, and the channel identifier of the first channel corresponding to the data of the first terminal device is known, and the data of the first terminal device is required for uplink transmission. Data is still data that needs to be transmitted downstream, so that the third terminal device can send the data of the first terminal device to the communication peer in a suitable channel, thereby further improving communication efficiency.
  • a method for relay communication is provided, which is applied to a communication system including a first terminal device, a second terminal device, a third terminal device, and a wireless access network device, wherein the third terminal The device is a device that currently provides a relay service for the first terminal device and the wireless access network device, and the second terminal device is a device that provides the first terminal device and the wireless access network device before the third terminal device
  • a device for a relay service the method includes: the second terminal device receives data belonging to the first terminal device; the second terminal device sends a first message to the third terminal device, the first message including the first terminal device
  • the data and notification information of the device, the notification information is used to indicate the identity of the first terminal device, the data radio bearer DRB identity and direction indication information, and the DRB identity is used to indicate the difference between the first terminal device and the radio access network device
  • the DRB that carries the data of the first terminal device in between, and the direction indication information is used to indicate the transmission direction of the data of the first terminal device.
  • the bearer may be a DRB
  • the first message carries a certain piece of data of the first terminal device (hereinafter denoted as the first terminal device Data) corresponding to the bearer identifier, the identifier of the first terminal device, and direction indication information, where the direction indication information may indicate whether the data of the first terminal device is uplink data or downlink data.
  • the data and notification information of the first terminal device can be carried in the same message (that is, the first message), so that the third terminal device can know which data is included in the first message after receiving the first message
  • the data of the terminal device and the DRB identifier corresponding to the data of the first terminal device so that the third terminal device can accurately determine the receiving end to which the data of the first terminal device is sent according to the first message (for example, The uplink data is sent to the wireless access network device, and the downlink data is sent to the first terminal device, and which channel (that is, a channel between the third terminal device and the wireless access network device, or the third terminal) A certain channel between the device and the first terminal device), thereby improving communication efficiency.
  • the notification information is carried in the side link control information SCI, and the time domain resource occupied by the SCI is the same as the time domain resource of the data belonging to the first terminal device, or the time domain occupied by the SCI The resource is before the time domain resource occupied by the data belonging to the first terminal device.
  • the notification information is carried in the adaptation layer of the first message.
  • a communication device may be an independent terminal device or a chip in the terminal device.
  • the device has the function of realizing the above-mentioned first aspect and various possible implementation modes. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the device includes: a receiving module and a sending module.
  • the receiving module or the sending module may be, for example, at least one of a transceiver, a receiver, and a transmitter, or the receiving module or the sending module may be Including radio frequency circuits or antennas.
  • the device also includes a processing module, which may be a processor.
  • the device further includes a storage module, and the storage module may be a memory, for example.
  • the storage module is used to store instructions.
  • the processing module is connected to the storage module, and the processing module can execute instructions stored in the storage module or instructions derived from other sources, so that the device executes the first aspect or any one of the methods described above.
  • the chip when the device is a chip, the chip includes: a receiving module and a sending module.
  • the chip also includes a processing module.
  • the receiving module and the sending module may be inputs on the chip, for example. /Output interface, pin or circuit, etc.
  • the processing module may be a processor, for example.
  • the processing module can execute instructions so that the chip in the terminal executes the first aspect and any possible implementation communication methods.
  • the processing module may execute instructions in the storage module, and the storage module may be a storage module in the chip, such as a register, a cache, and the like.
  • the storage module may also be located in the communication device but outside the chip, such as read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (random access memory) memory, RAM) etc.
  • ROM read-only memory
  • RAM random access memory
  • the processor mentioned in any of the above can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more for controlling the above All aspects of the communication method program execution integrated circuit.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • a communication device may be a terminal device or a chip in the terminal device.
  • the device has the function of realizing the above-mentioned second aspect and various possible implementation manners. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the device includes: a processing module and a sending module.
  • the sending module may be at least one of a transceiver and a transmitter, and the sending module may include a radio frequency circuit or an antenna.
  • the processing module may be a processor.
  • the device further includes a storage module, and the storage module may be a memory, for example.
  • the storage module is used to store instructions.
  • the processing module is connected to the storage module, and the processing module can execute instructions stored in the storage module or from other instructions, so that the device executes the communication methods of the second aspect and various possible implementation manners.
  • the device can be a wireless access network device.
  • the chip when the device is a chip, the chip includes: a processing module and a sending module.
  • the sending may be, for example, an output interface, a pin, or a circuit on the chip.
  • the processing module may be a processor, for example.
  • the processing module can execute instructions so that the chip in the terminal executes the second aspect and any possible implemented communication methods.
  • the processing module may execute instructions in the storage module, and the storage module may be a storage module in the chip, such as a register, a cache, and the like.
  • the storage module may also be located in the communication device but outside the chip, such as a read-only memory or other types of static storage devices that can store static information and instructions, random access memory, etc.
  • the processor mentioned in any of the above may be a general-purpose central processing unit, a microprocessor, a specific application integrated circuit, or one or more integrated circuits used to control the execution of the programs of the above-mentioned communication methods.
  • a communication device may be a terminal device or a chip in the terminal device.
  • the device has the function of realizing the aforementioned third aspect and various possible implementation manners. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the device includes: a receiving module and a sending module.
  • the receiving module or the sending module may be, for example, at least one of a transceiver, a receiver, and a transmitter.
  • the receiving module or the sending module may include Radio frequency circuit or antenna.
  • the device also includes a processing module, which may be a processor.
  • the device further includes a storage module, and the storage module may be a memory, for example.
  • the storage module is used to store instructions.
  • the processing module is connected to the storage module, and the processing module can execute instructions stored in the storage module or from other instructions, so that the device executes the communication methods of the third aspect and various possible implementation manners.
  • the device can be a terminal device.
  • the chip when the device is a chip, the chip includes: a receiving module and a sending module.
  • the receiving module and the sending module may be, for example, input/output interfaces, pins, or circuits on the chip.
  • the processing module may be a processor, for example.
  • the processing module can execute instructions so that the chip in the terminal executes the third aspect and any possible implementation communication methods.
  • the processing module may execute instructions in the storage module, and the storage module may be a storage module in the chip, such as a register, a cache, and the like.
  • the storage module may also be located in the communication device but outside the chip, such as a read-only memory or other types of static storage devices that can store static information and instructions, random access memory, etc.
  • the processor mentioned in any of the above may be a general-purpose central processing unit, a microprocessor, a specific application integrated circuit, or one or more integrated circuits used to control the execution of the programs of the above-mentioned communication methods.
  • a computer storage medium is provided, and program code is stored in the computer storage medium, and the program code is used to instruct instructions to execute the method in the foregoing first aspect or any possible implementation manner thereof.
  • a computer storage medium is provided, and program code is stored in the computer storage medium, and the program code is used to instruct instructions to execute the method in the foregoing first aspect or any possible implementation manner thereof.
  • a computer storage medium is provided, and program code is stored in the computer storage medium, and the program code is used to instruct instructions to execute the method in the second aspect, the third aspect, or any possible implementation manner thereof.
  • a computer program product containing instructions which when running on a computer, causes the computer to execute the method in any possible implementation of the first aspect.
  • a computer program product containing instructions which when running on a computer, causes the computer to execute the method in the second aspect, the third aspect, or any possible implementation manners thereof.
  • a processor configured to be coupled with a memory and configured to execute the method in the first aspect or any possible implementation manner thereof.
  • a processor is provided, which is configured to be coupled with a memory and used to execute the method in the second aspect, the third aspect, or any possible implementation manner thereof.
  • a chip in a thirteenth aspect, includes a processor and a communication interface.
  • the communication interface is used to communicate with an external device or an internal device.
  • the processor is used to implement the first aspect or any of its possible implementations. Methods.
  • the chip may further include a memory in which instructions are stored, and the processor is configured to execute instructions stored in the memory or instructions derived from other sources.
  • the processor is used to implement the method in the foregoing first aspect or any possible implementation manner thereof.
  • the chip can be integrated on the terminal device.
  • a chip in a fourteenth aspect, includes a processor and a communication interface, the communication interface is used to communicate with an external device or an internal device, and the processor is used to implement the second aspect or the third aspect or any of its possibilities. The method in the implementation.
  • the chip may further include a memory in which instructions are stored, and the processor is configured to execute instructions stored in the memory or instructions derived from other sources.
  • the processor is used to implement the method in the foregoing second aspect or third aspect or any possible implementation manner thereof.
  • the chip can be integrated on the terminal device.
  • the first terminal device receives instruction information from the second terminal device instructing the second terminal device to stop providing relay services for the first terminal device and the wireless access network device, and passes the third terminal through the third terminal device according to the instruction information
  • the device sends notification information to the wireless access network device to notify the wireless access network device that the first terminal device accesses the wireless access network device through the third terminal device, so that the wireless access network device can communicate with the wireless access network device through the third terminal device.
  • a terminal device communicates, thereby avoiding that the first terminal device suddenly discovers that the second terminal device cannot perform relaying, which causes the communication between the first terminal device and the wireless access network device to be interrupted, thereby improving communication efficiency.
  • Figure 1 is a schematic diagram of a communication system of the present application
  • FIG. 2 is a schematic diagram of a user plane protocol stack in a communication system according to an embodiment of the present application
  • FIG. 3 is a schematic diagram of a control plane protocol stack in the communication system of an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a relay communication method according to an embodiment of the present application.
  • Fig. 5 is a schematic diagram of a transmission channel of an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a relay communication method according to another embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a relay communication method according to another embodiment of the present application.
  • FIG. 8 is a schematic block diagram of a relay communication device according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a relay communication apparatus according to an embodiment of the present application.
  • FIG. 10 is a schematic block diagram of a relay communication apparatus according to another embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a relay communication apparatus according to another embodiment of the present application.
  • FIG. 12 is a schematic block diagram of a relay communication apparatus according to another embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a relay communication apparatus according to another embodiment of the present application.
  • FIG. 14 is a schematic block diagram of a relay communication apparatus according to another embodiment of the present application.
  • FIG. 15 is a schematic block diagram of a relay communication apparatus according to another embodiment of the present application.
  • FIG. 16 is a schematic block diagram of a relay communication device according to another embodiment of the present application.
  • GSM global system for mobile communications
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD LTE Time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • the first terminal device in the embodiment of the present application may refer to user equipment, access terminal equipment, user unit, user station, mobile station, mobile station, remote station, remote terminal equipment, mobile equipment, user terminal equipment, terminal equipment, wireless Communication equipment, user agent or user device.
  • the first terminal device can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), Handheld devices, computing devices, or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices with wireless communication functions, the first terminal device in the future 5G network or the public land mobile network that will evolve in the future (public land mobile network,
  • the first terminal device in the PLMN is not limited in the embodiment of the present application.
  • the method steps executed by the terminal device may be specifically implemented by at least one chip in the terminal device.
  • the radio access network device in the embodiment of the application may be a device used to communicate with the first terminal device.
  • the radio access network device may be a global system for mobile communications (GSM) system or code division multiple access
  • GSM global system for mobile communications
  • the base station (base transceiver station, BTS) in (code division multiple access, CDMA) can also be the base station (NodeB, NB) in the wideband code division multiple access (WCDMA) system, or LTE
  • the evolved NodeB (evoled NodeB, eNB or eNodeB) in the system can also be a radio controller in the cloud radio access network (CRAN) scenario, or the radio access network device can be a relay station or a radio access network. Access points, in-vehicle devices, wearable devices, and wireless access networks in future 5G networks or wireless access networks in future evolved PLMN networks, etc., are not limited in the embodiment of the present application.
  • the first terminal device or the radio access network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also referred to as main memory).
  • the operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system.
  • the application layer includes applications such as browsers, address books, word processing software, and instant messaging software.
  • the embodiments of the application do not specifically limit the specific structure of the execution subject of the methods provided in the embodiments of the application, as long as the program that records the codes of the methods provided in the embodiments of the application can be provided according to the embodiments of the application.
  • the execution subject of the method provided in this embodiment of the application may be the first terminal device or the wireless access network device, or the first terminal device or the wireless access network device can call the program and The functional module that executes the program.
  • the application that executes the relay communication method of the embodiment of this application and the application used to control the receiving end device to complete the received may be a different application program.
  • Figure 1 is a schematic diagram of a communication system of the present application.
  • the relay device 103 may be used to provide a relay service for the at least one first terminal device 105 and the wireless access network device 101.
  • the number of relay devices 103 may be one or multiple, that is, multiple relay devices provide relay services for the first terminal device and the radio access network device at the same time.
  • the relay device is a terminal type node, and the relay device and the first terminal device communicate through a sidelink (also called a PC5 port).
  • the wireless communication system 100 shown in FIG. 1 is only to illustrate the technical solution of the application more clearly, and does not constitute a limitation to the application.
  • Those of ordinary skill in the art will know that with the evolution of the network architecture and new services In the emergence of scenarios, the technical solutions provided in this application are equally applicable to similar technical problems.
  • FIG. 2 shows a schematic diagram of a user plane protocol stack in a communication system according to an embodiment of the present application.
  • the user plane when facing the first terminal device, the user plane only has a radio link control (RLC) layer/media access control (MAC) layer/physical (PHY) Layer protocol stack, when facing radio access network equipment (for example, eNB of the LTE system or en-gNB, gNB of the NR system), the user plane only has an adaptation/RLC/MAC/PHY protocol stack.
  • RLC radio link control
  • MAC media access control
  • PHY physical
  • the adaptation layer mainly contains the identification used to identify the first terminal device on the PC5 port, the first terminal device's wireless data bearer (data radio bearerB, DRB) identification, or the corresponding first terminal device and relay device Information about at least one item of logical channel identifier (logical channel identifier, LCID).
  • the packet data convergence protocol (PDCP) layer of the first terminal device and the PDCP layer of the eNB are transparently transmitted through the relay device, that is, between the terminal device and the eNB With an end-to-end PDCP layer, the relay device does not parse the PDCP layer.
  • the first terminal device and the relay device in the embodiment of this application can communicate through the LTE/NR Uu air interface or PC5 port or sidelink port, and the relay device and the eNB communicate through the LTE/NR Uu air interface ,
  • the terminal equipment communicates with the core network through the S1-U between the eNB and the CN and the S5 or S8 port inside the CN.
  • the wireless access network device is the gNB in the NR system
  • the terminal device communicates through the NG3 port between the gNB and CN.
  • Fig. 3 shows a schematic diagram of a control plane protocol stack in a communication system according to an embodiment of the present application.
  • the control plane only has the RLC/MAC/PHY protocol stack, and when facing the wireless access network device, the control plane only has the adaptation layer (adapation)/RLC/MAC/PHY Protocol stack.
  • the RRC layer and PDCP layer of the first terminal device and the RRC layer and PDCP layer of the radio access network device are transparently transmitted through the relay device, that is, there is a connection between the terminal device and the eNB.
  • the relay device does not parse the PDCP layer and RRC layer.
  • the control plane of the first terminal device also includes a non-access stratum (NAS) layer.
  • the NAS layer of the first terminal device and the NAS layer of the core network are transparently transmitted through the relay device and the wireless access network device. of.
  • the first terminal device and the relay device can communicate through an LTE/NR Uu air interface, a PC5 port, or a sidelink port.
  • the relay device and the eNB communicate through the LTE/NR Uu air interface, and the terminal device communicates with the core network through the S1-MME between the eNB and the CN.
  • the wireless access network device is the gNB in the NR system
  • the terminal device communicates through the NG2/NG3 port between the gNB and CN.
  • Fig. 4 shows a schematic flowchart of a relay communication method according to an embodiment of the present application.
  • the first terminal device receives instruction information from the second terminal device, the instruction information instructing the second terminal device to stop providing a relay service between the first terminal device and the radio access network device.
  • the second terminal device sends the instruction information to the first terminal device.
  • the second terminal device may be a device that currently provides a relay service between the first terminal device and the wireless access network device.
  • the first terminal device in the embodiment of the present application may generally be referred to as a remote user equipment (remote user equipment), which is not limited in this application.
  • the interface between the second terminal device and the first terminal device is a side link interface or a PC5 interface, for example, as shown in FIG. 2 or FIG. 3.
  • the interface between the second terminal device and the radio access network device is an air interface, for example, an LTE air interface or an NR air interface.
  • the second terminal device detects the signal quality between the second terminal device and the wireless access network device, and detects that the signal quality between the second terminal device and the wireless access network device is less than or If it is equal to the preset threshold, the indication information is generated.
  • the second terminal device may detect the signal quality with the wireless access network device, and if it detects that the signal quality does not meet a preset condition, for example, the signal quality is less than or equal to a preset threshold, it generates the indication information and sends it to the first A terminal device sends the instruction information. That is, by detecting the signal quality by the second terminal device, the terminal device with the relay function can be replaced in time, avoiding the interruption of the communication efficiency between the first terminal device and the access network device, thereby improving the communication efficiency.
  • a preset condition for example, the signal quality is less than or equal to a preset threshold
  • the second terminal device may also be the indication information generated when it is detected that the signal quality between the second terminal device and the first terminal device is less than or equal to a preset threshold. Not limited.
  • the second terminal device may also find that a radio link failure (Radio Link Failure, RLF) has occurred in the radio access network, for example, the second terminal device finds that the physical layer monitoring signal is degraded, causing T310 to time out, or When it is found that the MAC layer random access fails, or the RLC layer data retransmission times are found to reach the maximum retransmission times, the indication information is generated.
  • RLF Radio Link Failure
  • the indication information may be carried in the PHY header or MAC header of the user plane, or the indication information may be carried in the sidelink control indicator (SCI) or MAC control element (CE) of the control plane. In ), this avoids sending the indication information separately and saves signaling overhead.
  • SCI sidelink control indicator
  • CE MAC control element
  • the indication information may directly instruct the second terminal device to stop providing relay services for the first terminal device and the radio access network device.
  • the indication information may also indirectly indicate that the second terminal device stops providing relay services for the first terminal device and the wireless access network device.
  • the indication information indicates that the second terminal device is connected to the wireless access network device.
  • the signal quality between the devices is less than or equal to a preset threshold, or the indication information indicates that the signal quality between the second terminal device and the first terminal device is less than or equal to the preset threshold, or the indication information is the second terminal device
  • a radio link failure occurs with the radio access network device, that is, the second terminal device can flexibly select an indication mode.
  • the first terminal receives the indirect instruction, it learns that the second terminal device will stop providing relay services for the first terminal device and the radio access network device.
  • the first terminal device sends notification information to the wireless access network device through the third terminal device, where the notification information is used to instruct the first terminal device to connect to the wireless access network device through the relay service of the third terminal device.
  • Network access equipment e.g., the third terminal device receives the notification information from the first terminal device, and forwards the notification information to the wireless access network device.
  • the wireless access network device receives the notification information.
  • the first terminal device receives the instruction information from the second terminal device instructing the second terminal device to stop providing the relay service for the first terminal device. After that, the first terminal device searches for the third terminal device, and then transmits the information to the wireless terminal device through the third terminal device.
  • the access network device sends notification information, which is used to instruct the first terminal device to connect to the wireless access network device through the relay of the third terminal device, so that the wireless access network device can communicate with the first terminal device through the third terminal device.
  • the terminal device communicates, thereby avoiding that the first terminal device suddenly discovers that the second terminal device cannot perform relay, which causes the communication between the first terminal device and the wireless access network device to be interrupted, and the communication efficiency is improved.
  • the instruction information sent by the second terminal device to the first terminal device includes the third terminal device identifier, so that the first terminal device determines the third terminal device according to the third terminal device identifier, and passes the third terminal device
  • the device sends the notification information to the wireless access network device.
  • the first terminal device can learn the third terminal device to be switched to only after receiving the instruction information.
  • the first terminal device may also predetermine the third terminal device. For example, the first terminal device periodically searches for the relay device, or the signal quality between the first terminal device and the relay device currently serving is lower than When or equal to a certain threshold, search for potential relay devices. Then the first terminal device immediately starts the replacement from the second terminal device to the third terminal device after receiving the instruction information.
  • switching of a terminal device with a relay function means that the first terminal device is connected to the wireless access network device through the relay of the second terminal device and converted to the first terminal device through The relay of the third terminal device is connected to the wireless access network device.
  • the first terminal device receives a relay notification message (relay notification) broadcast by at least one relay device, where the relay notification message is used to indicate that the corresponding terminal device can provide a relay service for the first terminal device, and
  • the third terminal device is determined according to the at least one relay notification message.
  • the first terminal device may search for a new relay device (which may be referred to as the "third terminal device" below) before switching to a terminal device with a relay function.
  • the first terminal device may be Find a new relay device after receiving the instruction information sent by the second terminal device.
  • the first terminal device can passively receive at least one relay notification message sent by the surrounding relay devices, that is, each relay device sends a relay notification message to indicate that it can provide the first terminal device and the wireless access network device Following the service.
  • the first terminal device searches for the relay notification message in the receiving resource pool.
  • the so-called resource pool may be a frequency domain resource composed of one or more radio resource blocks (resource block, RB), or a specific transmission time unit (for example, 1 ms) or one or more RBs on a group of transmission time units. Composed of time-frequency domain resources.
  • the receiving resource pool may be preset, or may be sent by the radio access network device to the first terminal device through broadcast (for example, a physical broadcast channel PBCH) or an RRC message. In this way, the first terminal device selects a target terminal device from the terminal devices corresponding to the at least one relay notification message as the third terminal device.
  • the relay notification message may also carry cell identification, radio access network device identification, radio access technology (RAT) indication (for example, LTE or NR), timing advance (TA) value, or The number of hops between the first terminal device and the wireless access device, etc., so that the first terminal device can determine a more appropriate third terminal device to provide the first terminal device with a relay service according to the relay notification message, thereby further Improve communication efficiency.
  • RAT radio access technology
  • TA timing advance
  • the interface between the third terminal device and the first terminal device is a side link interface or a PC5 interface
  • the interface between the third terminal device and the radio access network device is an LTE air interface or an NR air interface.
  • the first terminal device actively discovers the relay device.
  • the first terminal device sends a relay discovery request message.
  • the relay discovery request message is used to seek a terminal device with a relay function and receive a response to the relay discovery.
  • the response message of the request message determines the terminal device that sends the response message as the third terminal device.
  • the first terminal device may actively search for a new relay device (which may be referred to as the “third terminal device” below) before switching the terminal device with the relay function.
  • the first terminal device may be After receiving the instruction information, it actively searches for a new relay device.
  • the first terminal device may broadcast the relay discovery request message, for example, send the relay discovery request message in the sending resource pool.
  • the sending resource pool may be preset, or sent by the base station to the first terminal device through broadcast or RRC message.
  • the relay discovery request message may carry the device identification of the first terminal device and the device identification of the wireless access network device. After receiving the relay discovery request message, the terminal device with the relay function can serve the first terminal device.
  • the radio access network device When the radio access network device provides a relay service, a response message is sent to the first terminal device, and the first terminal device uses the terminal device that sent the response message as the third terminal device. If there are multiple terminal devices feeding back response messages, the first terminal device can select any one as the third terminal device.
  • the response message further includes a cell identity, radio access network equipment, RAT indication, TA value or hop count, etc., so that when the first terminal device receives multiple response messages, A more suitable third terminal device is selected from the plurality of corresponding terminal devices to provide a relay service for the first terminal device, thereby further improving communication efficiency.
  • the notification information further includes the device identifier of the first terminal device.
  • the device identifier of the first terminal device may be the cell radio network temporary identifier (C-RNTI) of the first terminal device in a cell, or layer 2 (L2) defined by the 3GPP standard.
  • C-RNTI cell radio network temporary identifier
  • L2 layer 2
  • the identifier (for example, the identifier that uniquely identifies the terminal device at the PC5 port), the MAC address, the IP address, or the local identifier assigned by the wireless access network, which is not limited in this application.
  • the wireless access network device can learn from the device identifier that the terminal device with the relay function between the first terminal devices corresponding to the device identifier has switched, so that the relay is performed on multiple first terminal devices. In the case of handover, the wireless access network device can accurately learn which first terminal device sent the notification information, and when the first terminal device communicates, the switched terminal device is used, which improves communication efficiency.
  • the notification information may be carried in an RRC message.
  • the first terminal device may carry the notification information by sending an uplink RRC message to the third terminal device.
  • the third terminal device receives the RRC message, does not parse the RRC message, but directly sends the RRC message Forward to wireless access network equipment.
  • the RRC message may be named a relay addition (relay addition) or relay switch (relay switch) message.
  • the first terminal device When the first terminal device sends the notification information to the third terminal device, it first uses the notification information as a load, and encapsulates the RLC header, MAC header, and PHY header of the PC5 port outside the load, and includes the RLC/MAC/PHY header Add the first instruction.
  • the RLC header is, for example, the RLC header defined in the standard
  • the MAC header is, for example, the MAC header or MAC subheader defined in the standard
  • the PHY header is, for example, the resource allocation header defined in the standard.
  • the data is called the service data unit (SDU) of this layer before entering the specific protocol layer for processing, and after being processed by this layer (such as adding or encapsulating the header of this layer), it is called the protocol data unit ( protocol data unit, PDU).
  • SDU service data unit
  • the header of each protocol layer mainly contains load-related information.
  • the RLC layer header mainly contains information such as data type (indicating data packet or control packet), sequence number, and offset.
  • the MAC header mainly contains information such as logical channel number and data length.
  • the notification information is the RLC SDU of the RLC layer, and the RLC header becomes the RLC PDU after adding the RLC header.
  • the processing of other layers can be deduced by analogy.
  • the first indication is used to indicate that the load sent by the third terminal device on the PC5 port is an RRC message for the radio access network device. Or the first terminal device adds the first indication to the side link control information SCI before sending the notification information to the third terminal device.
  • the third terminal device learns through the first instruction that the load is an RRC message sent to the radio access network device.
  • the third terminal device receives the RRC message from the first terminal device, it removes the PHY/MAC/RLC of the sidelink/PC5 port, and transmits the RRC message containing the notification information through the third terminal device and the radio access network
  • the signaling radio bearer (SRB) or DRB channel between the devices is sent to the radio access network device, and the radio access network device obtains the notification information.
  • the radio access network device learns according to the notification information that the first terminal device has completed the handover from the second terminal device to the third terminal device.
  • the radio access network device learns according to the notification information that the first terminal device has added a third terminal device as a relay device between itself and the radio access network device.
  • an adaptation layer may be added above the LTE/NR air interface PHY/MAC/RLC, and the adaptation layer includes the device identifier of the first terminal device, so that the wireless
  • the access network device can remove the encapsulation of the LTE/NR air interface PHY/MAC/RLC to obtain the device identification of the first terminal device.
  • the wireless access network device obtains the device identification of the first terminal device. In the case of, it can be learned that the first terminal device is connected to the wireless access network device through the relay of the second terminal device and is converted to the wireless access network device through the relay of the third terminal device.
  • the radio access network device may also send the RRC message to the PDCP corresponding to the SRB1 of the first terminal device. entity.
  • the third terminal device adds an adaptation layer above the RLC.
  • the third terminal device may additionally send indication information indicating that the adaptation layer exists. Distribution layer.
  • the notification information can also be carried on the PHY/MAC/PHY header of the PC5 port.
  • the third terminal device sends the first message to the wireless access network device. Informing the wireless access network device that the third terminal device serves as a relay device between the first terminal device and the wireless access network device.
  • the first message may be an uplink RRC message generated by the third terminal device.
  • the first message may include the identifier of the first terminal device.
  • the first message may contain an implicit instruction, or may carry a displayed instruction to notify the wireless access network device that the third terminal device is used as a relay of the first terminal device to connect to the wireless access network device.
  • the first message is named relay addition, or the first message contains information elements of relay addition.
  • the radio access network device learns that the first terminal device has completed the switch from the second terminal device to the third terminal device according to the notification information.
  • the radio access network device learns according to the notification information that the first terminal device has added a third terminal device as a relay device between itself and the radio access network device.
  • the second terminal device may send the signal to be transmitted of the first terminal device to the third terminal device.
  • the signal to be transmitted may be a downlink signal sent by the wireless access network received by the second terminal device, but not sent to the first terminal device or sent to the first terminal device, or may be the second terminal device Receive an uplink signal sent by the first terminal device that has not been sent to the wireless access network device or has not been successfully sent to the wireless access network device.
  • the second terminal device may forward the signal to be transmitted from the first terminal device to the wireless access network device through the third terminal device.
  • the second terminal device may forward the signal to be transmitted to the first terminal device through the third terminal device, thereby avoiding data loss caused by switching of terminal devices with a relay function and improving signal quality.
  • the signal to be transmitted may be the signal of the first terminal device that failed to be transmitted after being sent by the second terminal device, or may be the signal of the first terminal device that has not been forwarded by the second terminal device. Qualify.
  • the signal to be transmitted may be a downlink signal or an uplink signal.
  • the downlink signal may be data or signaling, which is not limited in this application.
  • the uplink signal may be data or signaling, which is not limited in this application.
  • the following embodiment uses data as an example for description.
  • the first terminal device receives a PDCP status report from a radio access network device, where the PDCP status report is used to indicate whether the radio access network device successfully receives uplink PDCP data.
  • the first terminal device receives the PDCP status report of the wireless access network device, when the PDCP status report indicates that the reception fails, the first terminal device resends the failed transmission to the wireless access network device through the third terminal device data.
  • the radio access network device periodically feeds back the PDCP status report, and the PDCP status report includes the packet loss situation.
  • the PDCP status report includes the first lost PDCP serial number (serial number, SN) number, and a bitmap (bitmap). The value of the bitmap indicates that the serial number from the first lost packet (first missing SN, FMS) Whether each subsequent PDCP SN from the beginning is lost.
  • the first terminal device resends the uplink data that failed to be sent by the second terminal device to the wireless access network device through the third terminal device.
  • the radio access network device receives a PDCP status report from the first terminal device, where the PDCP status report is used to indicate whether the first terminal device successfully receives downlink PDCP data.
  • the radio access network device After the radio access network device receives the PDCP status report of the first terminal device, when the PDCP status report indicates that the reception fails, the radio access network device resends the downlink to the first terminal device through the third terminal device data.
  • the first terminal device may also periodically feed back a PDCP status report, which is similar to the above-mentioned PDCP status report, so that the radio access network device can determine whether the data is successfully received according to the PDCP status report.
  • the report indicates that the data reception fails, the first data is retransmitted to the first terminal device through the third terminal device.
  • the second terminal device determines the second channel identifier according to the first channel carrying the uplink signal and the first mapping relationship, and sends the uplink data received through the first channel to the third channel through the channel corresponding to the second channel identifier.
  • the terminal device is further sent by the third terminal device to the radio access network device, and the first mapping relationship is a one-to-one mapping relationship between at least one first channel identifier and at least one second channel identifier.
  • the first mapping relationship is a one-to-one correspondence between at least one first channel identifier and at least one second channel identifier.
  • the first channel identifier may be the bearer identifier of the first terminal device
  • the second channel identifier may be the second logical channel identifier
  • the bearer corresponding to the bearer identifier of the first terminal device may be used between the first terminal device and the radio access network device.
  • the logical channel corresponding to the second logical channel identifier can be used for communication between the second terminal device and the third terminal device.
  • the second terminal device receives the uplink data from the first terminal device, and according to the bearer identifier of the first terminal device that carries the uplink data (the following identifier is the bearer identifier of the first terminal device), and in combination with the first mapping relationship, It is determined that the uplink data is sent on a specific second logical channel among the plurality of second logical channels, so that the second terminal device regularly sends the uplink data that was not successfully sent to the third terminal device through the second logical channel, so that the first Third, the terminal device subsequently forwards the data to the wireless access network device, which avoids the packet loss problem caused by the change of the terminal device with the relay function and improves the communication efficiency.
  • the second terminal device can determine the corresponding bearer according to the identity of the first terminal device and the bearer identity of the first terminal device together.
  • the second relay device receives the RRC configuration message sent by the radio access network device, and the RRC configuration message includes the first terminal device identifier, the mapping relationship between the bearer identifier of the first terminal and the sixth channel identifier.
  • the sixth channel is a transmission channel between the first terminal device and the second terminal device, and the sixth channel identifier may be a logical channel identifier used for data transmission in the transmission channel.
  • the second terminal device receives the data from the first terminal device through the sixth channel, and obtains the logical channel identifier of the corresponding sixth channel. Then, the second terminal device obtains the corresponding bearer identifier of the first terminal device according to the logical channel identifier and the mapping relationship.
  • the bearer in the embodiment of the present application may be SRB or DRB.
  • the channel between the terminal devices with the relay function or the channel between the first terminal device and the terminal device with the relay function in the embodiments of the present application may be a logical channel.
  • the following embodiments take the logical channel as an example for description , This application does not limit this.
  • the second terminal device determines the second channel identifier according to the third channel carrying the downlink signal, the first mapping relationship, and the second mapping relationship, and passes the downlink data received through the third channel through the second channel identifier
  • the corresponding second channel is sent to the third terminal device, and then sent by the third terminal device to the first terminal device, the first mapping relationship is a one-to-one mapping relationship between at least one first channel identifier and at least one second channel identifier
  • the second mapping relationship is a one-to-one mapping relationship between at least one third channel identifier and at least one first channel identifier.
  • the first channel identifier may be the bearer identifier of the first terminal device
  • the second channel identifier may be the second logical channel identifier
  • the third channel identifier may be the bearer identifier of the second terminal device
  • the bearer identifier of the first terminal device The corresponding bearer can be used for communication between the first terminal device and the wireless access network device, and the logical channel corresponding to the second logical channel identifier can be used for communication between the second terminal device and the third terminal device.
  • the bearer corresponding to the bearer identifier of the device may be used for communication between the second terminal device and the radio access network device.
  • the second terminal device receives the downlink data from the radio access network device.
  • the downlink data is carried on the third channel (that is, the second terminal device bears).
  • the second terminal device determines the connection with the third channel and the third mapping relationship.
  • the bearer identity of the first terminal device corresponding to the third channel identity and then determine the second channel identity (that is, the second logical channel identity) according to the bearer identity of the first terminal device and the first mapping relationship, and then carry the downlink data on
  • the second logical channel identifies the corresponding second logical channel, so that the second terminal device regularly sends the unsuccessful downlink signal to the third terminal device through the second logical channel, and the third terminal device forwards it to the first
  • the terminal device avoids the packet loss problem caused by the change of the terminal device with the relay function, and improves the communication efficiency.
  • the first mapping relationship may be determined by the second terminal device and sent to the third terminal device; or the first mapping relationship may be determined by the radio access network device and sent to the second terminal device respectively And the third terminal device.
  • the radio access network device may only send the first mapping relationship to the second terminal device, and the second terminal device sends the first mapping relationship to the third terminal device.
  • the second terminal device may send an SCI to the third terminal device, and the SCI carries the first mapping relationship, which avoids sending the first mapping relationship separately and saves signaling overhead.
  • the second mapping relationship may be sent by the radio access network device to the second terminal device.
  • the third terminal device may determine the fourth channel according to the second logical channel identifier, the first mapping relationship, and the third mapping relationship, where the first mapping relationship is at least one first channel identifier and at least one second channel A one-to-one mapping relationship is identified, and the third mapping relationship is a mapping relationship between at least one fourth channel identifier and at least one first channel identifier.
  • the second terminal device when the second terminal device sends uplink data to be sent to the wireless access network device, the second terminal device may send the uplink data to the third terminal device, and the third terminal device forwards the uplink data to the wireless access network device.
  • the fourth channel is the channel between the third terminal device and the radio access network device.
  • the first channel identifier is the bearer identifier of the first terminal device
  • the fourth channel identifier is the bearer identifier of the third terminal device
  • the The first mapping relationship is a one-to-one mapping relationship between the bearer identifier of at least one first terminal device and at least one second logical channel identifier
  • the third mapping relationship is the bearer identifier of at least one third terminal device and at least one first terminal device.
  • the third terminal device can determine the bearer identity of the first terminal device according to the second logical channel identity and the first mapping relationship, and then determine the third terminal device bearer identity according to the bearer identity of the first terminal device and the third mapping relationship, Furthermore, the uplink data is sent to the radio access network device through the bearer corresponding to the bearer identifier of the third terminal device, thereby improving communication efficiency.
  • the third terminal device may determine the fifth channel according to the second channel identifier, the first mapping relationship, and the fourth mapping relationship, where the first mapping relationship is at least one first channel identifier and at least one second channel identifier A one-to-one mapping relationship, and the fourth mapping relationship is a one-to-one mapping relationship between at least one fifth channel identifier and at least one first channel identifier.
  • the third terminal device may determine the fifth channel according to the second channel, the first mapping relationship, and the fourth mapping relationship.
  • the fifth channel is used for communication between the first terminal device and the third terminal device, and the fifth channel may be a fifth logical channel.
  • the first channel identifier is the bearer identifier of the first terminal device
  • the first mapping relationship is a one-to-one mapping relationship between the bearer identifier of at least one first terminal device and at least one second logical channel identifier
  • the fourth mapping relationship There is a one-to-one mapping relationship between at least one fifth logical channel identifier and at least one bearer identifier of the first terminal device.
  • the third terminal device can determine the bearer identity of the first terminal device according to the second logical channel and the first mapping relationship, and then determine the fifth logical channel identity according to the bearer identity of the first terminal device and the fourth mapping relationship, and then pass the The logical channel corresponding to the fifth logical channel identifier sends downlink data to the first terminal device, thereby improving communication efficiency.
  • the third mapping relationship or the fourth mapping relationship may be determined by the radio access network device and sent by the third terminal device.
  • the third mapping relationship or the fourth mapping relationship may also be carried in the RRC reconfiguration message.
  • the uplink signal or the downlink signal not forwarded by the second terminal device may be forwarded by the third terminal device.
  • the radio access network device may perform downlink data retransmission, and the first terminal device may perform uplink data retransmission; or the wireless access network device may perform downlink data retransmission and the second terminal device may perform uplink data retransmission (ie, the second The terminal device forwards the uplink data to the third terminal device, and the third terminal device sends the uplink data to the wireless access network device); or the second terminal device performs downlink data retransmission (that is, the second terminal device forwards the downlink data to the second terminal device).
  • Three terminal devices, sent to the first terminal device through the third terminal device the first terminal device performs uplink data retransmission; or the second terminal device performs downlink data retransmission, and the second terminal device performs uplink data retransmission.
  • the first terminal device determines the fourth terminal device, and the fourth terminal device is capable of communicating with the second terminal device or the third terminal device as the first terminal device and the wireless access network.
  • a relay device that provides a relay service. The first terminal device sends to the wireless access network device through the fourth terminal device to indicate that the fourth terminal device can communicate with the second terminal device or the third terminal device.
  • the notification information of the relay service is provided for the first terminal device and the wireless access network device.
  • the first terminal device when the first terminal device finds that the fourth terminal device can also provide a relay service for the first terminal device and the wireless radio access network device, the first terminal device can perform relay addition. , That is, the first terminal device establishes multiple relay connections. For example, the first terminal device can respectively establish a connection with the fourth terminal device as a relay device and the second terminal device as a relay device at the same time, or the first terminal device can respectively simultaneously establish a connection with the fourth terminal device and the third terminal device.
  • the second terminal device is currently providing the relay service for the first terminal device and the wireless access network device
  • the second terminal device and the fourth terminal device are both the first terminal device.
  • Terminal equipment and wireless access network equipment provide relay services. If the third terminal device is currently providing relay services for the first terminal device and the wireless access network device, after adding the fourth terminal device, the third terminal device and the fourth terminal device are both the first terminal device and the wireless access device.
  • the networked equipment provides relay service.
  • Fig. 6 shows a schematic flowchart of a relay communication method according to another embodiment of the present application.
  • the first terminal device receives instruction information, which is used to indicate that the first terminal device needs to replace the second terminal device.
  • the second terminal device is a device currently providing a relay service for the first terminal device, and the The instruction information carries at least one terminal device that can be replaced by the first terminal device.
  • the wireless access network device sends the instruction information.
  • the second terminal device is a device that currently provides a relay service for the communication between the first terminal device and the wireless access network
  • the instruction information carries at least one terminal device that can be replaced by the first terminal device, and the at least one terminal device may It is carried in the instruction information in the form of a list.
  • the communication interface between the first terminal device and the second terminal device is a PC5 interface or a side link interface.
  • the interface between the second terminal device and the first terminal device is a side link interface or a PC5 interface, for example, as shown in FIG. 2 or FIG. 3.
  • the second terminal device may be a terminal device type equipment.
  • the interface between the second terminal device and the radio access network device is an air interface, for example, an LTE air interface or an NR air interface.
  • the radio access network device detects the signal quality between the first terminal device and the second terminal device, and the signal quality between the first terminal device and the second terminal device is less than or equal to the first preset. If the threshold is set, the instruction information is generated.
  • the wireless access network device detects that the signal quality between the first terminal device and the second terminal device is poor. For example, the wireless access network device learns the second terminal device and the first terminal device from the second terminal device. Or the signal quality between the second terminal device and the first terminal device measured by the first terminal device forwarded by the second terminal device.
  • the wireless access network device detects the signal quality between the wireless access network device and the second terminal device, and the signal quality between the wireless access network device and the second terminal device is less than or equal to In the case of the second preset threshold, the indication information is generated.
  • the wireless access network device detects that the signal between the wireless access network device and the second terminal device is poor. For example, the wireless access network device measures the uplink signal of the second terminal device (sounding reference signal). reference signal (SRS)), or the layer 3 measurement report defined by the 3GPP standard reported by the second terminal device (for example, reference signal receiving power (RSRP)) or reference signal receiving quality (reference signal receiving quality) , RSRQ)), or layer 2 channel state information (channel state information, CSI) feedback (for example, channel quality indicator (CQI)/precoding matrix indicator (Precoding Matrix Indicator, PMI)/rank indicator (rank indication, RI)).
  • SRS sounding reference signal
  • RSRP reference signal receiving power
  • RSRQ reference signal receiving quality
  • CQI channel quality indicator
  • PMI Precoding Matrix Indicator
  • rank indicator rank indication, RI
  • layer 2 may be at least one of the MAC layer, RCL layer, PDCP layer or adaptation layer;
  • layer 3 may be the RRC layer or a layer above the RRC layer, for example, the IP layer, the UDP layer/TCP layer, or Application layer.
  • the radio access network device can directly send to the first terminal device The instructions.
  • the radio access network device may carry the indication information through an RRC reconfiguration message.
  • the wireless access network device may send the instruction information to the first terminal device through the second terminal device.
  • the wireless access network device may also send an RRC reconfiguration message to the first terminal device through the second terminal device, where the RRC reconfiguration message carries the indication information.
  • the first terminal device determines a third terminal device from the at least one terminal device according to the instruction information.
  • the interface between the third terminal device and the first terminal device is also a PC5 interface (or side link interface), and the interface between the third terminal device and the radio access network device may be an LTE air interface or an NR air interface .
  • the first terminal device performs handover from the second terminal device to the third terminal device.
  • the handover may be understood as the first terminal device changing from accessing to the access network device through the second terminal device to accessing the access network device through the third terminal device.
  • the first terminal device sends notification information to the wireless access network device through the third terminal device, where the notification information is used to instruct the first terminal device to connect to the wireless access network device through the third terminal device.
  • the first terminal device receives the instruction information sent by the wireless access network device to indicate that the first terminal device needs to replace the second terminal device, and the instruction information also carries at least one terminal device that can be replaced.
  • a terminal device can select a suitable third terminal device according to the instruction information, which prevents the first terminal device from actively searching for a suitable third terminal device, saves the power consumption of the first terminal device, and communicates through a suitable third terminal device , It also improves the communication efficiency between the first terminal device and the wireless access network device.
  • FIG. 7 shows a schematic flowchart of relay communication according to another embodiment of the present application.
  • the embodiments of the present application are applied to a communication system including a first terminal device, a second terminal device, a third terminal device, and a wireless access network device.
  • the third terminal device is currently the first terminal device and A device that provides a relay service by a radio access network device
  • the second terminal device is a device that provides a relay service for the first terminal device and the radio access network device before the third terminal device.
  • the second terminal device receives data belonging to the first terminal device.
  • the data belonging to the first terminal device may be data that the second terminal device has not successfully forwarded, or data that has not yet been forwarded.
  • the data of the first terminal device may be uplink data or downlink data, which is not limited in this application.
  • the second terminal device sends a first message to the third terminal device, where the first message includes data and notification information of the first terminal device, and the notification information is used to indicate the identity and data of the first terminal device.
  • the DRB identifier is used to indicate the DRB between the first terminal device and the radio access network device that carries the data of the first terminal device
  • the direction indication information is used to indicate The data transmission direction of the first terminal device.
  • the bearer may be a DRB
  • the first message carries a certain piece of data of the first terminal device (denoted as the first A bearer identifier corresponding to the data of a terminal device, the identifier of the first terminal device, and direction indication information, where the direction indication information may indicate whether the data belonging to the first terminal device is uplink data or downlink data. If it is uplink data, the third relay device subsequently forwards the data to the radio access network device. If it is downlink data, the third relay device subsequently forwards the data to the first terminal device.
  • the data and notification information of the first terminal device can be carried in the same message (that is, the first message), so that the third terminal device can know which data is included in the first message after receiving the first message
  • the data of the terminal device and the DRB identifier corresponding to the data of the first terminal device so that the third terminal device can accurately determine the receiving end to which the data of the first terminal device is sent according to the first message (for example, The uplink data is sent to the wireless access network device, and the downlink data is sent to the first terminal device, and which channel (that is, a channel between the third terminal device and the wireless access network device, or the third terminal) A certain channel between the device and the first terminal device), thereby improving communication efficiency.
  • the notification information can be carried in the SCI, so that the data of the SCI and the first terminal device can be in the same message, and the time of transmitting the SCI and the data of the first terminal device can be the same, It may also be different.
  • the time domain resource for transmitting the SCI is before the time domain resource for transmitting the data of the first terminal device.
  • time domain resource may be based on at least one time domain symbol as a unit, where 12 or 14 time domain symbols form a transmission time unit, and this time transmission unit occupies 1 ms in LTE, which is referred to as including two time slots.
  • a subframe of NR also occupies 1ms in NR, but it is called a time slot, which is not limited in this application.
  • the notification information may be carried in the adaptation layer in the first message.
  • the second relay device sends the data belonging to the first terminal device to the third relay device, it encapsulates the adaptation layer header, RLC header, MAC header, and PHY header of the PC5 interface outside the data, and then The adaptation layer includes the identifier of the first terminal device, the bearer identifier of the first terminal device, and direction indication information.
  • the direction indication information may be UL or DL indication, or it may be UL when the direction indication information is carried, and DL when the direction indication information is not carried. Or, when the direction indication information is carried, it is expressed as DL, and when the direction indication information is not carried, it is expressed as UL.
  • the second terminal device may encapsulate the data of the first terminal device and the notification information through the adaptation layer to obtain the first message, and send the first message to the third terminal device, and the third terminal device receives The adaptation layer parses to obtain the notification information.
  • the notification information may be carried in the MAC layer or other layers in the first message.
  • the relay communication method according to the embodiment of the present application is described in detail above, and the relay communication apparatus of the embodiment of the present application will be described below.
  • FIG. 8 shows a schematic block diagram of an apparatus 800 for relay communication according to an embodiment of the present application.
  • the apparatus 800 may correspond to the terminal device in the embodiment shown in FIG. 4, and may have any function of the first terminal device in the method.
  • the device 800 includes a receiving module 810 and a sending module 820.
  • the receiving module 810 is configured to receive instruction information from the second terminal device, where the instruction information is used to instruct to stop providing the relay service between the first terminal device and the wireless access network device;
  • the sending module 820 is further configured to send notification information to the wireless access network device through a third terminal device, the notification information indicating that the first terminal device is connected to the wireless access network device through the third terminal device.
  • the indication information indicates that the signal quality between the second terminal device and the radio access network device is less than or equal to a preset quality threshold.
  • the indication information indicates that a radio link failure occurs between the second terminal device and the radio access network device.
  • the indication information further indicates the identity of the third terminal device
  • the apparatus 800 further includes a processing module 830 configured to determine the third terminal device according to the identity of the third terminal device.
  • the notification information further indicates the identity of the first terminal device.
  • the sending module 810 is further configured to send the identifier of the third terminal device to the second terminal device.
  • FIG. 9 shows a schematic block diagram of an apparatus 900 for relay communication provided in an embodiment of the present application.
  • the apparatus 900 may be the terminal device described in FIG. 1 and the terminal device described in FIG. 4.
  • the device can adopt the hardware architecture shown in FIG. 9.
  • the device may include a processor 910 and a transceiver 920.
  • the device may also include a memory 930.
  • the processor 910, the transceiver 920, and the memory 930 communicate with each other through an internal connection path.
  • the relevant functions implemented by the processing module 830 in FIG. 8 may be implemented by the processor 910, and the relevant functions implemented by the receiving module 810 and the sending module 820 may be implemented by the processor 910 controlling the transceiver 920.
  • the processor 910 may be a general-purpose central processing unit (central processing unit, CPU), microprocessor, application-specific integrated circuit (ASIC), dedicated processor, or one or more An integrated circuit used to implement the technical solutions of the embodiments of this application.
  • a processor may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • it can be a baseband processor or a central processing unit.
  • the baseband processor can be used to process communication protocols and communication data.
  • the central processor can be used to control relay communication devices (such as base stations, terminal equipment, or chips), execute software programs, and process software programs. data.
  • the processor 910 may include one or more processors, such as one or more central processing units (central processing unit, CPU).
  • processors such as one or more central processing units (central processing unit, CPU).
  • CPU central processing unit
  • the CPU may be a single processor.
  • the core CPU can also be a multi-core CPU.
  • the transceiver 920 is used to send and receive signals.
  • the transceiver may include a transmitter and a receiver, the transmitter is used to send signals, and the receiver is used to receive signals. It should be understood that the signal may be data and/or signaling.
  • the memory 930 includes but is not limited to random access memory (RAM), read-only memory (ROM), erasable programmable memory (erasable programmable memory, EPROM), read-only memory A compact disc (read-only memory, CD-ROM), and the memory 930 is used to store related instructions and data.
  • the memory 930 is used to store program codes and data of the terminal device, and may be a separate device or integrated in the processor 910.
  • the processor 910 is configured to control the transceiver and the wireless access network device to perform information transmission.
  • the processor 910 is configured to control the transceiver and the wireless access network device to perform information transmission.
  • FIG. 9 only shows a simplified design of the device for relay communication.
  • the device can also contain other necessary components, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all terminal devices that can implement the application are protected by this application. Within range.
  • the device 900 may be a chip, for example, a communication chip that can be used in a terminal device to implement related functions of the processor 910 in the terminal device.
  • the chip can be a field programmable gate array, a dedicated integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, and a programmable controller or other integrated chips for realizing related functions.
  • the chip may optionally include one or more memories for storing program codes. When the codes are executed, the processor realizes corresponding functions.
  • the apparatus 900 may further include an output device and an input device.
  • the output device communicates with the processor 910, and can display information in a variety of ways.
  • the output device may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector, etc.
  • the input device communicates with the processor 801 and can receive user input in a variety of ways.
  • the input device may be a mouse, a keyboard, a touch screen device, or a sensor device.
  • FIG. 10 shows a schematic block diagram of an apparatus 1000 for relay communication according to an embodiment of the present application.
  • the apparatus 1000 may correspond to the terminal device in the embodiment shown in FIG. 4, and may have any function of the second terminal device in the method.
  • the device 1000 includes a processing module 1010 and a sending module 1020.
  • the processing module 1010 is configured to generate instruction information, where the instruction information is used to instruct to stop providing the relay service between the first terminal device and the wireless access network device;
  • the sending module 1020 is configured to send the instruction information to the first terminal device.
  • the indication information indicates that the signal quality between the second terminal device and the radio access network device is less than a preset threshold.
  • the indication information indicates that a radio link failure occurs between the second terminal device and the radio access network device.
  • the sending module 1020 is further configured to send data to be sent of the first terminal device to a third terminal device, and the third terminal device is currently being provided for the first terminal device and the radio access network device.
  • the second terminal device is a device that previously provided a relay service for the first terminal device and the radio access network device.
  • the sending module 1020 is specifically configured to:
  • the first message includes the data to be sent, and the first message also includes the identification of the first terminal device, the identification of the first channel, and transmission direction indication information, and the first channel is used for the first
  • the terminal device communicates with the wireless access network device.
  • FIG. 11 shows an apparatus 1100 for relay communication provided by an embodiment of the present application.
  • the apparatus 1100 may be the second terminal device described in FIG. 4.
  • the device can adopt the hardware architecture shown in FIG. 11.
  • the device may include a processor 1110 and a transceiver 1120.
  • the device may also include a memory 1130.
  • the processor 1110, the transceiver 1120, and the memory 1130 communicate with each other through an internal connection path.
  • the related functions implemented by the processing module 1010 in FIG. 10 may be implemented by the processor 1110, and the related functions implemented by the sending module 1020 may be implemented by the processor 1110 controlling the transceiver 1120.
  • the processor 1110 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), a dedicated processor, or one or more It is an integrated circuit that implements the technical solutions of the embodiments of the present application.
  • a processor may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • it can be a baseband processor or a central processing unit.
  • the baseband processor can be used to process communication protocols and communication data.
  • the central processor can be used to control relay communication devices (such as base stations, terminal equipment, or chips), execute software programs, and process software programs. data.
  • the processor 1110 may include one or more processors, such as one or more central processing units (CPU).
  • processors such as one or more central processing units (CPU).
  • CPU central processing units
  • the CPU may be a single processor.
  • the core CPU can also be a multi-core CPU.
  • the transceiver 1120 is used to send and receive signals.
  • the transceiver may include a transmitter and a receiver, the transmitter is used to send signals, and the receiver is used to receive signals.
  • the memory 1130 includes but is not limited to random access memory (RAM), read-only memory (ROM), erasable programmable memory (erasable read only memory, EPROM), read-only memory A compact disc (read-only memory, CD-ROM), the memory 1130 is used to store related instructions and data.
  • RAM random access memory
  • ROM read-only memory
  • EPROM erasable programmable memory
  • CD-ROM compact disc
  • the memory 1130 is used to store program codes and data of the terminal device, and may be a separate device or integrated in the processor 1110.
  • the processor 1110 is configured to control the transceiver to perform information transmission with the wireless access network device.
  • the transceiver to perform information transmission with the wireless access network device.
  • the apparatus 1100 may further include an output device and an input device.
  • the output device communicates with the processor 1110 and can display information in a variety of ways.
  • the output device may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector, etc.
  • the input device communicates with the processor 801 and can receive user input in a variety of ways.
  • the input device may be a mouse, a keyboard, a touch screen device, or a sensor device.
  • FIG. 11 only shows a simplified design of an apparatus for relay communication.
  • the device can also contain other necessary components, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all terminal devices that can implement the application are protected by this application. Within range.
  • the device 1100 may be a chip, for example, a communication chip that can be used in a terminal device to implement related functions of the processor 1110 in the terminal device.
  • the chip can be a field programmable gate array, a dedicated integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, and a programmable controller or other integrated chips for realizing related functions.
  • the chip may optionally include one or more memories for storing program codes. When the codes are executed, the processor realizes corresponding functions.
  • the embodiment of the present application also provides a device, which may be a terminal device or a circuit.
  • the device can be used to perform the actions performed by the terminal device in the foregoing method embodiments.
  • FIG. 12 shows a schematic block diagram of an apparatus 1200 for relay communication according to an embodiment of the present application.
  • the apparatus 1200 may correspond to the terminal device in the embodiment shown in FIG. 7, and may have any function of the second terminal device in the method.
  • the device 1200 includes a receiving module 1210 and a sending module 1220.
  • the device 1200 is applied to a communication system including a first terminal device, the device 1200, a third terminal device, and a wireless access network device, where the third terminal device is currently the first terminal device And the radio access network equipment providing relay service equipment, the second terminal equipment is the equipment providing relay service for the first terminal equipment and the radio access network equipment before the third terminal equipment, the apparatus 1200 include:
  • the receiving module 1210 is configured to receive data belonging to the first terminal device
  • the sending module 1220 is further configured to send a first message to the third terminal device.
  • the first message includes the data and notification information belonging to the first terminal device.
  • the notification information is used to indicate the identity
  • the data radio bearer DRB identifier and direction indication information where the DRB identifier is used to identify the DRB that carries the data between the first terminal device and the radio access network device, and the direction indication information is used to indicate the transmission direction of the data.
  • the notification information is carried in the side link control information SCI, and the time domain resource of the SCI is the same as the time domain resource of the data belonging to the first terminal device, or when the data belongs to the first terminal device. Before domain resources.
  • the notification information is carried in an adaptation layer of the first message.
  • FIG. 13 shows an apparatus 1300 for relay communication provided by an embodiment of the present application.
  • the apparatus 1300 may be the second terminal device described in FIG. 7.
  • the device can adopt the hardware architecture shown in FIG. 13.
  • the device may include a processor 1310 and a transceiver 1320.
  • the device may also include a memory 1330.
  • the processor 1310, the transceiver 1320 and the memory 1330 communicate with each other through an internal connection path.
  • the required processing related functions in FIG. 10 can be implemented by the processor 1310, and the related functions implemented by the receiving module 1010 and the sending module 1020 can be implemented by the processor 1310 controlling the transceiver 1320.
  • the processor 1310 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), a dedicated processor, or one or more It is an integrated circuit implementing the technical solutions of the embodiments of the present application.
  • a processor may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • it can be a baseband processor or a central processing unit.
  • the baseband processor can be used to process communication protocols and communication data.
  • the central processor can be used to control relay communication devices (such as base stations, terminal equipment, or chips), execute software programs, and process software programs. data.
  • the processor 1310 may include one or more processors, such as one or more central processing units (CPU).
  • processors such as one or more central processing units (CPU).
  • CPU central processing units
  • the CPU may be a single processor.
  • the core CPU can also be a multi-core CPU.
  • the transceiver 1320 is used to send and receive signals.
  • the transceiver may include a transmitter and a receiver, the transmitter is used to send signals, and the receiver is used to receive signals.
  • the memory 1330 includes but is not limited to random access memory (RAM), read-only memory (ROM), erasable programmable memory (erasable read only memory, EPROM), read-only memory A compact disc (read-only memory, CD-ROM), the memory 1330 is used to store related instructions and data.
  • RAM random access memory
  • ROM read-only memory
  • EPROM erasable programmable memory
  • CD-ROM compact disc
  • the memory 1330 is used to store program codes and data of the terminal device, and may be a separate device or integrated in the processor 1310.
  • the processor 1310 is configured to control the transceiver to perform information transmission with the wireless access network device.
  • the transceiver to perform information transmission with the wireless access network device.
  • the apparatus 1300 may further include an output device and an input device.
  • the output device communicates with the processor 1310 and can display information in a variety of ways.
  • the output device may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector, etc.
  • the input device communicates with the processor 801 and can receive user input in a variety of ways.
  • the input device may be a mouse, a keyboard, a touch screen device, or a sensor device.
  • FIG. 13 only shows a simplified design of an apparatus for relay communication.
  • the device can also contain other necessary components, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all terminal devices that can implement the application are protected by this application. Within range.
  • the device 1300 may be a chip, for example, a communication chip that can be used in a terminal device to implement related functions of the processor 1310 in the terminal device.
  • the chip can be a field programmable gate array, a dedicated integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, and a programmable controller or other integrated chips for realizing related functions.
  • the chip may optionally include one or more memories for storing program codes. When the codes are executed, the processor realizes corresponding functions.
  • the embodiment of the present application also provides a device, which may be a terminal device or a circuit.
  • the device can be used to perform the actions performed by the terminal device in the foregoing method embodiments.
  • FIG. 14 shows a simplified schematic diagram of the structure of the terminal device. It is easy to understand and easy to illustrate.
  • the terminal device uses a mobile phone as an example.
  • the terminal equipment includes a processor, a memory, a radio frequency circuit, an antenna, and an input and output device.
  • the processor is mainly used to process the communication protocol and communication data, and to control the terminal device, execute the software program, and process the data of the software program.
  • the memory is mainly used to store software programs and data.
  • the radio frequency circuit is mainly used for the conversion of baseband signal and radio frequency signal and the processing of radio frequency signal.
  • the antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input and output devices.
  • the processor When data needs to be sent, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.
  • FIG. 14 only one memory and processor are shown in FIG. 14. In actual terminal equipment products, there may be one or more processors and one or more memories.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.
  • the antenna and radio frequency circuit with the transceiving function can be regarded as the transceiving unit of the terminal device
  • the processor with the processing function can be regarded as the processing unit of the terminal device.
  • the terminal device includes a transceiver unit 1410 and a processing unit 1420.
  • the transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver, and so on.
  • the processing unit may also be called a processor, a processing board, a processing module, a processing device, and so on.
  • the device for implementing the receiving function in the transceiver unit 1410 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiver unit 1410 as the sending unit, that is, the transceiver unit 1410 includes a receiving unit and a sending unit.
  • the transceiver unit may sometimes be called a transceiver, a transceiver, or a transceiver circuit.
  • the receiving unit may sometimes be called a receiver, receiver, or receiving circuit.
  • the transmitting unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.
  • transceiving unit 1410 is configured to perform sending and receiving operations on the terminal device side in the foregoing method embodiment
  • processing unit 1420 is configured to perform other operations on the terminal device in the foregoing method embodiment except for the transceiving operation.
  • the processing unit 1420 is further configured to execute the processing steps on the terminal device side in the embodiment of the present application.
  • the transceiver unit 1410 is configured to perform the transceiver operations in step 401 and/or step 402 in FIG. 4, and/or the transceiver unit 1410 is also configured to perform other transceiver steps on the terminal device side in the embodiment of the present application.
  • the chip When the device for relay communication is a chip, the chip includes a transceiver unit and a processing unit.
  • the transceiver unit may be an input/output circuit or a communication interface;
  • the processing unit is a processor or microprocessor or integrated circuit integrated on the chip.
  • the device shown in FIG. 15 can also be referred to.
  • the device can perform functions similar to the processor 1410 in FIG. 14.
  • the device includes a processor 1501, a data sending processor 1503, and a data receiving processor 1505.
  • the processing module 830 in the foregoing embodiment may be the processor 1501 in FIG. 15 and completes corresponding functions.
  • the receiving module 810 and the sending module 820 in the foregoing embodiment may be the sending data processor 1503 and the receiving data processor 1505 in FIG. 15.
  • the channel encoder and the channel decoder are shown in FIG. 15, it can be understood that these modules do not constitute a restrictive description of this embodiment, and are only illustrative.
  • Fig. 16 shows another form of this embodiment.
  • the processing device 1600 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem.
  • the communication device in this embodiment can be used as the modulation subsystem therein.
  • the modulation subsystem may include a processor 1603 and an interface 1604.
  • the processor 1603 completes the function of the aforementioned processing module 810
  • the interface 1604 completes the function of the aforementioned transceiver module 820.
  • the modulation subsystem includes a memory 1608, a processor 1603, and a program stored in the memory and capable of running on the processor. When the processor executes the program, as shown in Figs. 4, 6 and 7 The method of the illustrated embodiment.
  • the memory 1608 can be nonvolatile or volatile, and its location can be located inside the modulation subsystem or in the processing device 1600, as long as the memory 1608 can be connected to the The processor 1603 is fine.
  • a computer-readable storage medium is provided, and an instruction is stored thereon, and the method in the foregoing method embodiment is executed when the instruction is executed.
  • a computer program product containing instructions is provided, and when the instructions are executed, the method in the foregoing method embodiment is executed.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk SSD)) etc.
  • the processor may be an integrated circuit chip with signal processing capabilities.
  • the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (field programmable gate array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA ready-made programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electronic Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic random access memory
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous link dynamic random access memory synchronous link DRAM, SLDRAM
  • direct memory bus random access memory direct rambus RAM, DR RAM
  • At least one refers to one or more, and “multiple” refers to two or more.
  • “And/or” describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the associated objects are in an "or” relationship.
  • "The following at least one item (a)” or similar expressions refers to any combination of these items, including any combination of a single item (a) or plural items (a).
  • at least one item (a) of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple .
  • component used in this specification are used to denote computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution.
  • the component may be, but is not limited to, a process, a processor, an object, an executable file, an execution thread, a program, and/or a computer running on a processor.
  • the application running on the computing device and the computing device can be components.
  • One or more components may reside in processes and/or threads of execution, and components may be located on one computer and/or distributed among two or more computers.
  • these components can be executed from various computer readable media having various data structures stored thereon.
  • the component may be based on, for example, a signal having one or more data packets (such as data from two components interacting with another component in a local system, a distributed system, and/or a network, such as the Internet that interacts with other systems through signals) Communicate through local and/or remote processes.
  • a signal having one or more data packets (such as data from two components interacting with another component in a local system, a distributed system, and/or a network, such as the Internet that interacts with other systems through signals) Communicate through local and/or remote processes.
  • a and/or B can mean: A alone exists, and both A and B exist. , There are three cases of B alone. Among them, the presence of A or B alone does not limit the number of A or B. Taking the existence of A alone as an example, it can be understood as having one or more A.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

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Abstract

本申请提供了一种中继通信的方法和装置。第一终端设备从第二终端设备接收用于指示该第二终端设备停止提供第一终端设备和无线接入网设备之间中继服务的指示信息。第一终端设备通过第三终端设备向无线接入网设备发送通知信息通知无线接入网设备该第一终端设备通过该第三终端设备的中继服务接入该无线接入网设备，这样无线接入网设备可以通过第三终端设备与第一终端设备进行通信，从而避免了第一终端设备突然发现第二终端设备无法进行中继，导致第一终端设备与无线接入网设备的通信中断，提高了通信效率。

Description

中继通信的方法和装置
本申请要求于2019年2月15日提交中国专利局、申请号为201910117716.2、申请名称为“中继通信的方法和装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，更具体地，涉及一种中继通信的方法和装置。
背景技术
在第三代合作伙伴项目(the 3rd generation partnership project，3GPP)标准中，第一终端设备的小区切换主要是基于接入网设备的无线资源控制(radio resource control，RRC)消息的控制进行的。具体地，第一终端设备在移动时，向无线接入网设备发送该第一终端设备检测到的目标小区的信号质量，无线接入网设备根据目标小区的信号质量以及其他因素确定是否需要进行小区切换。在需要进行切换时，向第一终端设备发送RRC消息，该RRC消息可以携带第一终端设备将切换到的目标小区的标识。
在第一终端设备通过其它终端设备作为中继设备与无线接入网设备通信的场景中，随着第一终端设备的移动，无线接入网设备可通过所述其它终端设备向第一终端设备发送RRC消息，来指示待切换到的目标中继设备。这里假设第二终端设备为第一终端设备和无线接入网设备之间当前提供中继服务的终端设备，第三终端设备为潜在的为第一终端设备和无线接入网设备之间提供中继服务的终端设备。若第一终端设备突然从第二终端设备的覆盖范围内移动到第三终端设备的覆盖范围内，或者第二终端设备和无线接入网设备之间的信号质量变差甚至发生了无线链路失败，第一终端设备可能无法接收到无线接入网设备通过第二终端设备发送的RRC消息，也就不会进行中继设备的切换，从而使得第一终端设备与无线接入网设备的通信中断或通信效率降低。
发明内容
本申请提供一种中继通信的方法和装置，能够提高通信效率。
第一方面，提供了一种中继通信的方法，该方法包括：第一终端设备从第二终端设备接收指示信息，该指示信息用于指示停止提供该第一终端设备与无线接入网设备之间的中继服务；该第一终端设备通过第三终端设备的中继服务向该无线接入网设备发送通知信息，该通知信息指示该第一终端设备通过该第三终端设备连接到该无线接入网设备。
第一终端设备从第二终端设备接收指示该第二终端设备停止为第一终端设备和无线接入网设备提供中继服务的指示信息，并通过第三终端设备向无线接入网设备发送通知信息通知无线接入网设备该第一终端设备通过该第三终端设备的中继服务连接到该无线接入网设备，这样无线接入网设备可以通过第三终端设备与第一终端设备进行通信，从而避 免了第一终端设备突然发现第二终端设备无法进行中继，导致第一终端设备与无线接入网设备的通信中断，提高了通信效率。
在一些可能的实现方式中，该指示信息指示该第二终端设备和该无线接入网设备之间的信号质量小于或等于预设质量阈值。
该指示信息可以通过该第二终端设备和该无线接入网设备之间的信号质量小于或等于预设质量阈值来间接指示该第二终端设备停止为该第一终端设备和该无线接入网设备之间提供中继服务，本申请实施例提供了一种指示方式，提高指示的灵活性。
在一些可能的实现方式中，该指示信息指示该第二终端设备和该无线接入网设备之间发生无线链路失败。
该指示信息可以通过该第二终端设备和该无线接入网设备之间发生无线链路失败来间接指示该第二终端设备停止为该第一终端设备和该无线接入网设备之间提供中继服务，本申请实施例提供了另一种指示方式，提高指示的灵活性。
在一些可能的实现方式中，该指示信息还指示该第三终端设备的标识，该方法还包括：该第一终端设备根据该第三终端设备的标识，确定该第三终端设备。
该指示信息还可以指示第三终端设备的标识，这样第一终端设备可以确定出当前能够为该第一终端设备和该无线接入网设备进行中继服务的终端设备(即第三终端设备)，进而通过该第三终端设备向该无线接入网设备发送通知信息，使得无线接入网设备可以通过第三终端设备与第一终端设备进行通信，从而避免了第一终端设备突然发现第二终端设备无法进行中继，导致第一终端设备与无线接入网设备的通信中断，提高了通信效率。
在一些可能的实现方式中，该通知信息还指示该第一终端设备的标识。
该通知信息还可以指示该第一终端设备的标识，使得无线接入网设备根据该标识可以获知与该标识对应的第一终端设备之间的中继设备进行了切换，这样在多个第一终端设备进行了中继切换的情况下，无线接入网设备能够准确的获知该通知信息为哪个第一终端设备发送的，并在于该第一终端设备进行通信时，采用切换后的中继设备，提高了通信效率。
在一些可能的实现方式中，该方法还包括：该第一终端设备向该第二终端设备发送该第三终端设备的标识。
第一终端设备在确定第三终端设备为当前该第一终端设备和无线接入网设备进行中继的设备的情况下，还可以向该第二终端设备发送该第三终端设备的标识，可以有助于在第一终端设备的数据没有完成转发的情况下，通过该第三终端设备进行转发，避免该第一终端设备的数据丢失，提高了信号质量。
第二方面，提供了一种中继通信的方法，该方法包括：第二终端设备生成指示信息，该指示信息用于指示停止提供为第一终端设备和无线接入网设备之间的中继服务；该第二终端设备向该第一终端设备发送该指示信息。
第二终端设备生成指示该第二终端设备停止为第一终端设备和无线接入网设备提供中继服务的指示信息，向该指示信息发送给第三终端设备，使得第三终端设备根据该指示信息向无线接入网设备发送通知信息通知无线接入网设备该第一终端设备通过该第三终端设备接入该无线接入网设备，这样无线接入网设备可以通过第三终端设备与第一终端设备进行通信，从而避免了第一终端设备突然发现第二终端设备无法进行中继，导致第一终端设备与无线接入网设备的通信中断，提高了通信效率。
在一些可能的实现方式中，该指示信息指示该第二终端设备和该无线接入网设备之间的信号质量小于预设阈值。
该指示信息可以通过该第二终端设备和该无线接入网设备之间的信号质量小于或等于预设质量阈值来间接指示该第二终端设备停止为该第一终端设备和该无线接入网设备之间提供中继服务，本申请实施例提供了一种指示方式，提高指示的灵活性。
在一些可能的实现方式中，该指示信息指示该第二终端设备和该无线接入网设备之间发生无线链路失败。
该指示信息可以通过该第二终端设备和该无线接入网设备之间发生无线链路失败来间接指示该第二终端设备停止为该第一终端设备和该无线接入网设备之间提供中继服务，本申请实施例提供了另一种指示方式，提高指示的灵活性。
在一些可能的实现方式中，该方法还包括：该第二终端设备向第三终端设备发送该第一终端设备的待发送数据，该第三终端设备为当前为该第一终端设备和该无线接入网设备提供中继服务的设备，该第二终端设备为之前为该第一终端设备和该无线接入网设备提供中继服务的设备。
该第二终端设备向第三终端设备发送该第一终端设备的待发送数据，这样有助于在第一终端设备的数据没有完成转发的情况下，通过该第三终端设备进行转发，避免该第一终端设备的数据丢失，提高了信号质量。
在一些可能的实现方式中，该第二终端设备向第三终端设备发送该第一终端设备的待发送数据包括：该第二终端设备发送第一消息，该第一消息包括该待发送数据，且该第一消息还包括该第一终端设备的标识、第一通道的标识和传输方向指示信息，该第一通道用于该第一终端设备和该无线接入网设备之间进行通信。
第二终端设备可以通过第一消息携带该第一终端设备的数据，且该第一消息还可以携带该第一终端设备的标识、第一通道的标识和传输方向指示信息，这样第三终端设备可以知道该第一消息中携带的数据为属于第一终端设备的数据，以及获知该第一终端设备的数据对应的第一通道的通道标识，和该第一终端设备的数据为需要上行传输的数据，还是需要下行传输的数据，这样第三终端设备能够将该第一终端设备的数据在合适的通道中发送到通信对端，从而更进一步提高了通信效率。
第三方面，提供了一种中继通信的方法，该方法应用于包括第一终端设备、第二终端设备、第三终端设备和无线接入网设备的通信系统中，其中，该第三终端设备为当前为该第一终端设备和该无线接入网设备提供中继服务的设备，该第二终端设备为在该第三终端设备之前为该第一终端设备和该无线接入网设备提供中继服务的设备，该方法包括：该第二终端设备接收属于该第一终端设备的数据；该第二终端设备向该第三终端设备发送第一消息，该第一消息包括该第一终端设备的数据和通知信息，该通知信息用于指示该第一终端设备的标识、数据无线承载DRB标识和方向指示信息，该DRB标识用于指示该第一终端设备和该无线接入网设备之间承载该第一终端设备的数据的DRB，该方向指示信息用于指示该第一终端设备的数据的传输方向。
第一终端设备和无线接入网设备之间进行通信的承载可以有多个，该承载可以是DRB，其中该第一消息携带第一终端设备的某一个数据(下述表示为第一终端设备的数据)对应的承载标识、该第一终端设备的标识、方向指示信息，该方向指示信息可以是指示该 第一终端设备的数据为上行数据还是下行数据。此外，该第一终端设备的数据和通知信息可以携带在同一个消息(即第一消息)中，这样第三终端设备接收到该第一消息，就可以获知第一消息中包括的数据为哪个终端设备的数据，以及该第一终端设备的数据对应的DRB标识，以使得第三终端设备根据该第一消息能够准确的确定出将该第一终端设备的数据发送到哪个接收端(例如，上行的数据发送到无线接入网设备，下行的数据发送到该第一终端设备)，以及采用哪个通道(即第三终端设备和无线接入网设备之间的某一个通道，或者第三终端设备和第一终端设备之间的某一个通道)，从而提高了通信效率。
在一些可能的实现方式中，该通知信息携带在侧链路控制信息SCI中，该SCI占用的时域资源与该属于第一终端设备的数据的时域资源相同，或该SCI占用的时域资源在该属于第一终端设备的数据占用的时域资源之前。
通过SCI携带该通知信息，不需要配置专门用于传输该通知信息的资源，从而节省了信令开销。
在一些可能的实现方式中，该通知信息携带在该第一消息的适配层中。
第四方面，提供了一种通信装置，该装置可以是独立的终端设备，也可以是终端设备内的芯片。该装置具有实现上述第一方面及各种可能的实现方式的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，该装置包括：接收模块和发送模块，所述接收模块或发送模块例如可以是收发器、接收器、发射器中的至少一种，或者该接收模块或发送模块可以包括射频电路或天线。该装置还包括处理模块，该处理模块可以是处理器。
可选地，所述装置还包括存储模块，该存储模块例如可以是存储器。当包括存储模块时，该存储模块用于存储指令。该处理模块与该存储模块连接，该处理模块可以执行该存储模块存储的指令或源自其他的指令，以使该装置执行上述第一方面或其任意一项的方法。
在另一种可能的设计中，当该装置为芯片时，该芯片包括：接收模块和发送模块，可选地，该芯片还包括处理模块，接收模块和发送模块例如可以是该芯片上的输入/输出接口、管脚或电路等。处理模块例如可以是处理器。该处理模块可执行指令，以使该终端内的芯片执行上述第一方面以及任意可能的实现的通信方法。
可选地，该处理模块可以执行存储模块中的指令，该存储模块可以为芯片内的存储模块，如寄存器、缓存等。该存储模块还可以是位于通信设备内，但位于芯片外部，如只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)等。
其中，上述任一处提到的处理器，可以是一个通用中央处理器(CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制上述各方面通信方法的程序执行的集成电路。
第五方面，提供了一种通信装置，该装置可以是终端设备，也可以是终端设备内的芯片。该装置具有实现上述第二方面及各种可能的实现方式的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，该装置包括：处理模块和发送模块，所述发送模块例如可以是收发器、发射器中的至少一种，该发送模块可以包括射频电路或天线。该处理模块可以是处理器。
可选地，所述装置还包括存储模块，该存储模块例如可以是存储器。当包括存储模块时，该存储模块用于存储指令。该处理模块与该存储模块连接，该处理模块可以执行该存储模块存储的指令或源自其他的指令，以使该装置执行上述第二方面及各种可能的实现方式的通信方法。在本设计中，该装置可以为无线接入网设备。
在另一种可能的设计中，当该装置为芯片时，该芯片包括：处理模块和发送模块，发送例如可以是该芯片上的输出接口、管脚或电路等。处理模块例如可以是处理器。该处理模块可执行指令，以使该终端内的芯片执行上述第二方面以及任意可能的实现的通信方法。
可选地，该处理模块可以执行存储模块中的指令，该存储模块可以为芯片内的存储模块，如寄存器、缓存等。该存储模块还可以是位于通信设备内，但位于芯片外部，如只读存储器或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器等。
其中，上述任一处提到的处理器，可以是一个通用中央处理器，微处理器，特定应用集成电路，或一个或多个用于控制上述各方面通信方法的程序执行的集成电路。
第六方面，提供了一种通信装置，该装置可以是终端设备，也可以是终端设备内的芯片。该装置具有实现上述第三方面及各种可能的实现方式的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，该装置包括：接收模块和发送模块，所述接收模块或发送模块例如可以是收发器、接收器、发射器中的至少一种，该接收模块或发送模块可以包括射频电路或天线。该装置还包括处理模块，该处理模块可以是处理器。
可选地，所述装置还包括存储模块，该存储模块例如可以是存储器。当包括存储模块时，该存储模块用于存储指令。该处理模块与该存储模块连接，该处理模块可以执行该存储模块存储的指令或源自其他的指令，以使该装置执行上述第三方面及各种可能的实现方式的通信方法。在本设计中，该装置可以为终端设备。
在另一种可能的设计中，当该装置为芯片时，该芯片包括：接收模块和发送模块，接收模块和发送模块例如可以是该芯片上的输入/输出接口、管脚或电路等。处理模块例如可以是处理器。该处理模块可执行指令，以使该终端内的芯片执行上述第三方面以及任意可能的实现的通信方法。
可选地，该处理模块可以执行存储模块中的指令，该存储模块可以为芯片内的存储模块，如寄存器、缓存等。该存储模块还可以是位于通信设备内，但位于芯片外部，如只读存储器或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器等。
其中，上述任一处提到的处理器，可以是一个通用中央处理器，微处理器，特定应用集成电路，或一个或多个用于控制上述各方面通信方法的程序执行的集成电路。第五方面，提供了一种计算机存储介质，该计算机存储介质中存储有程序代码，该程序代码用于指示执行上述第一方面或其任意可能的实现方式中的方法的指令。
第七方面，提供了一种计算机存储介质，该计算机存储介质中存储有程序代码，该程 序代码用于指示执行上述第一方面或其任意可能的实现方式中的方法的指令。
第八方面，提供了一种计算机存储介质，该计算机存储介质中存储有程序代码，该程序代码用于指示执行上述第二方面、第三方面或其任意可能的实现方式中的方法的指令。
第九方面，提供了一种包含指令的计算机程序产品，其在计算机上运行时，使得计算机执行上述第一方面其任意可能的实现方式中的方法。
第十方面，提供了一种包含指令的计算机程序产品，其在计算机上运行时，使得计算机执行上述第二方面、第三方面或其任意可能的实现方式中的方法。
第十一方面，提供了一种处理器，用于与存储器耦合，用于执行上述第一方面或其任意可能的实现方式中的方法。
第十二方面，提供了一种处理器，用于与存储器耦合，用于执行上述第二方面、第三方面或其任意可能的实现方式中的方法。
第十三方面，提供了一种芯片，芯片包括处理器和通信接口，该通信接口用于与外部器件或内部器件进行通信，该处理器用于实现上述第一方面或其任意可能的实现方式中的方法。
可选地，该芯片还可以包括存储器，该存储器中存储有指令，处理器用于执行存储器中存储的指令或源于其他的指令。当该指令被执行时，处理器用于实现上述第一方面或其任意可能的实现方式中的方法。
可选地，该芯片可以集成在终端设备上。
第十四方面，提供了一种芯片，芯片包括处理器和通信接口，该通信接口用于与外部器件或内部器件进行通信，该处理器用于实现上述第二方面或第三方面或其任意可能的实现方式中的方法。
可选地，该芯片还可以包括存储器，该存储器中存储有指令，处理器用于执行存储器中存储的指令或源于其他的指令。当该指令被执行时，处理器用于实现上述第二方面或第三方面或其任意可能的实现方式中的方法。
可选地，该芯片可以集成在终端设备上。
基于上述技术方案，第一终端设备从第二终端设备接收指示该第二终端设备停止为第一终端设备和无线接入网设备提供中继服务的指示信息，并根据该指示信息通过第三终端设备向无线接入网设备发送通知信息通知无线接入网设备该第一终端设备通过该第三终端设备接入该无线接入网设备，这样无线接入网设备可以通过第三终端设备与第一终端设备进行通信，从而避免了第一终端设备突然发现第二终端设备无法进行中继，导致第一终端设备与无线接入网设备的通信中断，提高了通信效率。
附图说明
图1是本申请一个通信系统的示意图；
图2是本申请实施例的通信系统中的用户面协议栈的示意图；
图3是本申请实施例的通信系统中的控制面协议栈的示意图；
图4是本申请一个实施例的中继通信的方法的示意性流程图；
图5是本申请实施例的传输通道的示意图；
图6是本申请另一个实施例的中继通信的方法的示意性流程图；
图7是本申请又一个实施例的中继通信的方法的示意性流程图；
图8是本申请一个实施例的中继通信的装置的示意性框图；
图9是本申请一个实施例的中继通信的装置的示意性结构图；
图10是本申请另一个实施例的中继通信的装置的示意性框图；
图11是本申请另一个实施例的中继通信的装置的示意性结构图；
图12是本申请又一个实施例的中继通信的装置的示意性框图；
图13是本申请又一个实施例的中继通信的装置的示意性结构图；
图14是本申请又一个实施例的中继通信的装置的示意性框图；
图15是本申请又一个实施例的中继通信的装置的示意性框图；
图16是本申请又一个实施例的中继通信的装置的示意性框图。
具体实施方式
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通信(global system for mobile communications，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、未来的第五代(5th generation，5G)系统或新无线(new radio，NR)等。
本申请实施例中的第一终端设备可以指用户设备、接入终端设备、用户单元、用户站、移动站、移动台、远方站、远程终端设备、移动设备、用户终端设备、终端设备、无线通信设备、用户代理或用户装置。第一终端设备还可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的第一终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的第一终端设备等，本申请实施例对此并不限定。此外，本申请各个实施例中，终端设备执行的方法步骤，可具体由终端设备中的至少一个芯片来实现。
本申请实施例中的无线接入网设备可以是用于与第一终端设备通信的设备，该无线接入网设备可以是全球移动通信(global system for mobile communications，GSM)系统或码分多址(code division multiple access，CDMA)中的基站(base transceiver station，BTS)，也可以是宽带码分多址(wideband code division multiple access，WCDMA)系统中的基站(NodeB，NB)，还可以是LTE系统中的演进型基站(evoled NodeB，eNB或eNodeB)，还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器，或者该无线接入网设备可以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络中的无线接入网或者未来演进的PLMN网络中的无线接入网等，本申请实施例并不限定。
在本申请实施例中，第一终端设备或无线接入网设备包括硬件层、运行在硬件层之上的操作系统层，以及运行在操作系统层上的应用层。该硬件层包括中央处理器(central  processing unit，CPU)、内存管理单元(memory management unit，MMU)和内存(也称为主存)等硬件。该操作系统可以是任意一种或多种通过进程(process)实现业务处理的计算机操作系统，例如，Linux操作系统、Unix操作系统、Android操作系统、iOS操作系统或windows操作系统等。该应用层包含浏览器、通讯录、文字处理软件、即时通信软件等应用。并且，本申请实施例并未对本申请实施例提供的方法的执行主体的具体结构特别限定，只要能够通过运行记录有本申请实施例的提供的方法的代码的程序，以根据本申请实施例提供的方法进行通信即可，例如，本申请实施例提供的方法的执行主体可以是第一终端设备或无线接入网设备，或者，是第一终端设备或无线接入网设备中能够调用程序并执行程序的功能模块。
需要说明的是，在本申请实施例中，在应用层可以运行多个应用程序，此情况下，执行本申请实施例的中继通信的方法的应用程序与用于控制接收端设备完成所接收到的数据所对应的动作的应用程序可以是不同的应用程序。
图1是本申请一个通信系统的示意图。在无线通信系统100中，中继设备103可用于为该至少一个第一终端设备105与无线接入网设备101提供中继服务。其中，中继设备103的数目可以是一个，也可以是多个，即多个中继设备同时为第一终端设备和无线接入网设备提供中继服务。其中中继设备为终端类型的节点，中继设备和第一终端设备通过边链路sidelink(也称为PC5口)进行通信。
需要说明的，图1示出的无线通信系统100仅仅是为了更加清楚的说明本申请的技术方案，并不构成对本申请的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请提供的技术方案对于类似的技术问题，同样适用。
图2示出了本申请实施例的通信系统中的用户面协议栈的示意图。作为中继设备的终端设备，面对第一终端设备时用户面只具有无线链路控制(radio link control，RLC)层/媒体访问控制(media access control，MAC)层/物理(Physical，PHY)层协议栈，面对无线接入网设备(例如，LTE系统的eNB或NR系统的en-gNB、gNB)时用户面只具备适配层(adaptation)/RLC/MAC/PHY协议栈。下面无线接入网设备以LTE系统中的eNB为例。其中，适配层里主要包含用于识别第一终端设备在PC5口的标识，第一终端设备的无线数据承载(data radio bearerB，DRB)标识，或者，对应的第一终端设备和中继设备之间的逻辑信道标识(logical channel identifier，LCID)中的至少一项的信息。此外，图2所示的通信系统中，第一终端设备的分组数据汇聚协议(packet data convergence protocol，PDCP)层和eNB的PDCP层通过中继设备是透传的，即终端设备和eNB之间具有端到端的PDCP层，中继设备不解析该PDCP层。本申请实施例中的第一终端设备与中继设备可以通过LTE/NR Uu空口或PC5口或边链路(sidelink)口进行通信，中继设备和eNB之间通过LTE/NR Uu空口进行通信，终端设备通过eNB和CN之间的S1-U以及CN内部的S5或S8口和核心网进行通信。当无线接入网设备是NR系统中的gNB时，终端设备通过gNB和CN之间的NG3口进行通信。
图3示出了本申请实施例的通信系统中的控制面协议栈的示意图。作为中继设备的终端设备面对第一终端设备时控制面只具有RLC/MAC/PHY协议栈，面对无线接入网设备时控制面只具备适配层(adapation)/RLC/MAC/PHY协议栈。此外，图3所示的通信系统中，第一终端设备的RRC层以及PDCP层和无线接入网设备的RRC层以及PDCP层通过 中继设备是透传的，即终端设备和eNB之间具有端到端的RRC层以及PDCP层，中继设备不解析该PDCP层以及RRC层。此外，第一终端设备的控制面还包括非接入层(non access stratum，NAS)层，第一终端设备的NAS层与核心网的NAS层通过中继设备和无线接入网设备是透传的。第一终端设备与中继设备可以通过LTE/NR Uu空口或PC5口或边链路(sidelink)口进行通信。中继设备和eNB之间通过LTE/NR Uu空口进行通信，终端设备通过eNB和CN之间的S1-MME和核心网进行通信。当无线接入网设备是NR系统中的gNB时，终端设备通过gNB和CN之间的NG2/NG3口进行通信。
图4示出了本申请一个实施例的中继通信的方法的示意性流程图。
401，第一终端设备从第二终端设备接收指示信息，该指示信息指示该第二终端设备停止提供该第一终端设备和无线接入网设备之间的中继服务。相应地，第二终端设备向第一终端设备发送该指示信息。
具体地，第二终端设备可以是当前为第一终端设备和无线接入网设备之间提供中继服务的设备。
应理解，本申请实施例中的第一终端设备通常可以称为远端第一终端设备(remote user equipment)，本申请对此不进行限定。
可选地，该第二终端设备与该第一终端设备的接口为边链路接口或PC5接口，例如如图2或图3所示。第二终端设备与无线接入网设备之间的接口为空口，例如可以是LTE空口或NR空口。
可选地，第二终端设备检测该第二终端设备与该无线接入网设备之间的信号质量，并在检测到该第二终端设备与该无线接入网设备之间的信号质量小于或等于预设阈值的情况下，生成该指示信息。
具体地，第二终端设备可以检测与无线接入网设备之间的信号质量，若在检测到信号质量不符合预设条件，例如信号质量小于或等于预设阈值，则生成指示信息并向第一终端设备发送该指示信息。也就是说，通过第二终端设备检测信号质量，能够及时进行具有中继功能的终端设备的更换，避免第一终端设备与接入网设备之间的通信效率中断，从而提高通信效率。
可选地，该第二终端设备也可以是在检测该第二终端设备与该第一终端设备之间的信号质量小于或等于预设阈值的情况下，生成的该指示信息，本申请对此不进行限定。
可选地，第二终端设备还可以是发现在无线接入网内发生了无线链路失败(Radio Link Failure,RLF)时，例如第二终端设备发现物理层监测信号变差导致T310超时，或者发现MAC层随机接入失败，或者发现RLC层数据重传次数达到最大重传次数时，生成该指示信息。
可选地，该指示信息可以携带在用户面的PHY头或MAC头，或者该指示信息可以携带在控制面的侧链路控制指示(sidelink control indicator，SCI)或MAC控制单元(control element，CE)中，这样避免了单独发送该指示信息，节省了信令开销。
可选地，该指示信息可以直接地指示该第二终端设备停止为第一终端设备和无线接入网设备提供中继服务。
可选地，该指示信息也可以间接地指示该第二终端设备停止为第一终端设备和无线接入网设备提供中继服务，例如该指示信息指示该第二终端设备与该无线接入网设备之间的 信号质量小于或等于预设阈值，或该指示信息指示该第二终端设备与该第一终端设备之间的信号质量小于或等于预设阈值，或该指示信息该第二终端设备与该无线接入网设备之间发生无线链路失败，即第二终端设备可以灵活的选择指示方式。当第一终端收到所述间接指示时，获知第二终端设备将停止为第一终端设备和无线接入网设备提供中继服务。
402，该第一终端设备通过该第三终端设备向该无线接入网设备发送通知信息，该通知信息用于指示该第一终端设备通过该第三终端设备的中继服务连接到该无线接入网设备。相应地，该第三终端设备从该第一终端设备接收该通知信息，并将该通知信息转发给无线接入网设备。无线接入网设备接收到该通知信息。
第一终端设备从第二终端设备接收指示该第二终端设备停止为第一终端设备提供中继服务的指示信息，之后第一终端设备搜索第三终端设备，接着通过该第三终端设备向无线接入网设备发送通知信息，该通知信息用于指示第一终端设备通过第三终端设备的中继连接到该无线接入网设备，这样无线接入网设备可以通过第三终端设备与第一终端设备进行通信，从而避免了第一终端设备突然发现第二终端设备无法进行中继，导致第一终端设备与无线接入网设备的通信中断，提高了通信效率。
可选地，第二终端设备给第一终端设备发送的指示信息包括该第三终端设备标识，这样第一终端设备根据该第三终端设备标识确定该第三终端设备，并通过该第三终端设备向该无线接入网设备发送该通知信息。换句话说，第一终端设备可以在接收到指示信息之后，才能获知即将切换到的第三终端设备。
可选地，第一终端设备也可以预先确定第三终端设备，例如第一终端设备周期性搜索中继设备，或者在第一终端设备发现和当前服务的中继设备之间的信号质量低于或等于一定门限时，搜索潜在的中继设备。则第一终端设备在接收到指示信息之后，立即启动从第二终端设备到第三终端设备的更换。
需要说明的是，本申请实施例中的“具有中继功能的终端设备的切换”是指第一终端设备通过第二终端设备的中继连接到无线接入网设备变换为第一终端设备通过第三终端设备的中继连接到无线接入网设备。
可选地，第一终端设备接收至少一个中继设备广播的中继通知消息(relay notification)，该中继通知消息用于指示对应的终端设备能够为该第一终端设备提供中继服务，并根据该至少一个中继通知消息确定该第三终端设备。
具体地，第一终端设备在进行具有中继功能的终端设备的切换之前，可以寻找新的中继设备(下述可以称为“第三终端设备”)，例如，第一终端设备可以是在接收到第二终端设备发送的指示信息之后寻找新的中继设备。第一终端设备可以被动接收周围中继设备发送的至少一个中继通知消息，即每个中继设备发送一个中继通知消息用于指示自己能够为第一终端设备和无线接入网设备提供中继服务。例如第一终端设备在接收资源池搜索所述中继通知消息。应理解，所谓资源池可以是一个或多个无线资源块(resource block，RB)组成的频域资源，或者是特定传输时间单元(例如1ms)或一组传输时间单元上的一个或多个RB组成的时频域资源。每个载波上可以存在一个或多个资源池。所述接收资源池可以是预设定的，也可以是无线接入网设备通过广播(例如物理广播信道PBCH)或者RRC消息发送给第一终端设备的。这样第一终端设备从该至少一条中继通知消息对应的终端设备中选择一个目标终端设备作为该第三终端设备。其中，该中继通知消息还可以携带小区 标识、无线接入网设备标识、无线接入技术(radio access technology，RAT)指示(例如LTE或NR)、定时提前量(timing advance，TA)值或在第一终端设备与无线接入设备之间的跳数等，这样第一终端设备根据中继通知消息能够确定更加合适的第三终端设备为该第一终端设备提供中继服务，从而更进一步提高通信效率。
可选地，第三终端设备与第一终端设备之间的接口为边链路接口或PC5接口，第三终端设备和无线接入网设备之间的接口为LTE空口或NR空口。
可选地，第一终端设备主动发现中继设备，例如第一终端设备发送中继发现请求消息，该中继发现请求消息用于寻求具有中继功能的终端设备，并接收响应该中继发现请求消息的响应消息，将发送该响应消息的终端设备确定为第三终端设备。
具体地，第一终端设备在进行具有中继功能的终端设备切换之前，可以主动寻找新的中继设备(下述可以称为“第三终端设备”)，例如，第一终端设备可以是在接收到指示信息之后主动寻找新的中继设备。第一终端设备可以广播中继发现请求消息，例如在发送资源池发送所述中继发现请求消息。类似地，所述发送资源池可以是预设定的，也可以是基站通过广播或者RRC消息发送给第一终端设备的。该中继发现请求消息可以携带第一终端设备的设备标识和无线接入网设备的设备标识，具有中继功能的终端设备接收到该中继发现请求消息之后，在能够为该第一终端设备和该无线接入网设备提供中继服务的情况下，向第一终端设备发送响应消息，第一终端设备将发送该响应消息的终端设备作为第三终端设备。若存在多个终端设备反馈响应消息，则第一终端设备可以选择任意一个作为第三终端设备。
可选地，该响应消息还包括小区标识、无线接入网设备、RAT指示、TA值或跳数等，这样第一终端设备在接收到多个响应消息的情况下，从该多个响应消息对应的多个终端设备中选择其中更合适的第三终端设备为第一终端设备提供中继服务，从而更进一步提高通信效率。
可选地，该通知信息还包括该第一终端设备的设备标识。应理解，第一终端设备的设备标识可以是第一终端设备在一个小区内的小区无线网络临时标识(cell radio network temporary identifier，C-RNTI)、3GPP标准定义的层2(layer 2，L2)标识(例如在PC5口唯一识别终端设备的标识)、MAC地址、IP地址或无线接入网分配的局部本地(local)标识，本申请对此不进行限定。
具体地，无线接入网设备根据该设备标识可以获知与该设备标识对应的第一终端设备之间的具有中继功能的终端设备进行了切换，这样在多个第一终端设备进行了中继切换的情况下，无线接入网设备能够准确的获知该通知信息为哪个第一终端设备发送的，并在于该第一终端设备进行通信时，采用切换后的终端设备，提高了通信效率。
在一个实施例中，该通知信息可以携带在RRC消息中。
具体地，第一终端设备可以通过向第三终端设备发送上行RRC消息携带该通知信息，相应地，该第三终端设备接收该RRC消息，不解析该RRC消息，而是直接将所述RRC消息转发给无线接入网设备。例如所述RRC消息可以名为中继添加(relay addition)或中继切换(relay switch)消息。
第一终端设备给第三终端设备发送所述通知信息时，首先将所述通知信息作为负载，在负载外部封装PC5口的RLC头、MAC头以及PHY头，并在RLC/MAC/PHY头中增加 第一指示。其中RLC头例如标准中定义的RLC header，MAC头例如标准中定义的MAC header或MAC subheader，PHY头例如标准中定义的资源分配头resource allocation header。数据在进入特定协议层处理前被称为该层的服务数据单元(service data unit,SDU)，经过该层处理(例如增加或封装该层的头)后被称为该层的协议数据单元(protocol data unit,PDU)。每个协议层的头主要包含负载相关的信息，例如RLC层头主要包含数据类型(指示数据包还是控制包)，序列号，偏移量offset等信息。MAC头主要包含逻辑信道号，数据长度等信息。例如通知信息作为RLC层的RLC SDU，增加RLC头后成为RLC PDU。其他层的处理以此类推。第一指示用于指示第三终端设备在PC5口发送的负载是给无线接入网设备的RRC消息。或者第一终端设备在给第三终端设备发送所述通知信息前，在侧链路控制信息SCI中增加第一指示。第三终端设备收到后，通过第一指示获知所述负载是发送给无线接入网设备的RRC消息。此外，该第三终端设备从该第一终端设备中接收RRC消息后，去除sidelink/PC5口的PHY/MAC/RLC，将包含所述通知信息的RRC消息通过第三终端设备与无线接入网设备之间的信令无线承载(signal radio bearer,SRB)或DRB通道发送到无线接入网设备，该无线接入网设备获取该通知信息。当所述RRC消息名为relay switch时，无线接入网设备根据该通知信息获知第一终端设备已经完成从第二终端设备到第三终端设备的切换。当所述RRC消息名为relay addition时，无线接入网设备根据该通知信息获知第一终端设备增加了第三终端设备作为自己和无线接入网设备之间的中继设备。
可选地，该第三终端设备在转发该RRC消息时，还可以在LTE/NR空口PHY/MAC/RLC之上增加适配层，适配层中包括第一终端设备的设备标识，这样无线接入网设备在接收到RRC消息后，可去除LTE/NR空口PHY/MAC/RLC的封装以获取第一终端设备的设备标识，无线接入网设备在获取到该第一终端设备的设备标识的情况下，则能够获知第一终端设备通过第二终端设备的中继连接到无线接入网设备变换为通过第三终端设备的中继连接到无线接入网设备。
应理解，无线接入网设备在检测到已经与该第一终端设备标识对应的第一终端设备已经建立了RRC连接之后，还可以将该RRC消息发送到该第一终端设备的SRB1对应的PDCP实体。
可选地，第三终端设备在RLC之上增加了适配层，为了使得无线接入网设备获知RLC之上还包括适配层，则第三终端设备还可以另外发送指示信息指示存在该适配层。
在另一个实施例中，该通知信息也可以携带在PC5口的PHY/MAC/PHY头上，第三终端设备获取该通知信息后，给无线接入网设备发送第一消息，第一消息用于通知无线接入网设备第三终端设备作为第一终端设备和无线接入网设备之间的中继设备。例如第一消息可以是第三终端设备生成的上行RRC消息。第一消息中可以包含所述第一终端设备的标识。第一消息可以隐含指示，也可以携带显示的指示用于通知无线接入网设备第三终端设备作为第一终端设备的中继和无线接入网设备连接。例如第一消息名为relay addition，或者在第一消息中包含relay addition的信元。当所述RRC消息名为relay switch时，无线接入网设备根据该通知信息获知第一终端设备已经完成从第二终端设备到第三终端设备的切换。当所述RRC消息名为relay addition时，无线接入网设备根据该通知信息获知第一终端设备增加了第三终端设备作为自己和无线接入网设备之间的中继设备。
可选地，第二终端设备可以向该第三终端设备发送第一终端设备的待传输信号。所述待传输信号，可能是第二终端设备接收到无线接入网发送的，还未发送给第一终端设备或者给未成功发送给第一终端设备的下行信号，也可能是第二终端设备接收到第一终端设备发送的，还未发送给无线接入网设备或者给未成功发送给无线接入网设备的上行信号。
具体地，第二终端设备可以将向无线接入网设备发送的第一终端设备的待传输信号通过第三终端设备进行转发。或者第二终端设备可以将向第一终端设备发送的待传输信号通过第三终端设备进行转发，从而避免了具有中继功能的终端设备的切换造成的数据丢失，提高了信号质量。
需要说明的是，该待传输信号可以第二终端设备发送之后发送失败的第一终端设备的信号，也可以是该第二终端设备还没有转发的第一终端设备的信号，本申请对此不进行限定。
应理解，该待传输信号可以是下行信号，也可以是上行信号。该下行信号可以是数据，也可以是信令，本申请对此不进行限定。该上行信号可以是数据或信令等，本申请对此不进行限定，下述实施例以数据为例进行说明。
可选地，第一终端设备接收来自于无线接入网设备的PDCP状态报告，该PDCP状态报告用于指示该无线接入网设备接收上行PDCP数据是否成功。第一终端设备收到无线接入网设备的PDCP状态报告后，当所述PDCP状态报告指示接收失败时，第一终端设备通过该第三终端设备向该无线接入网设备重新发送传输失败的数据。
具体地，无线接入网设备周期性的反馈PDCP状态报告，该PDCP状态报告包括丢包情况。例如，该PDCP状态报告包括第一个丢失的PDCP序列号(serial number，SN)号，以及比特位图(bitmap)，通过该比特位图的取值指示从第一个丢失包序列号(first missing SN，FMS)开始的后续每个PDCP SN是否丢失。第一终端设备根据PDCP状态报告将通过第二终端设备发送失败的上行数据通过第三终端设备重新发送给无线接入网设备。
可选地，无线接入网设备接收来自于第一终端设备的PDCP状态报告，该PDCP状态报告用于指示该第一终端设备接收下行PDCP数据是否成功。无线接入网设备收到第一终端设备的PDCP状态报告后，当所述PDCP状态报告指示接收失败的时，无线接入网设备通过该第三终端设备向该第一终端设备重新发送该下行数据。
具体地，第一终端设备也可以周期性的反馈PDCP状态报告，该PDCP状态报告与上述PDCP状态报告类似，这样无线接入网设备根据该PDCP状态报告可以确定数据是否接收成功，在该PDCP状态报告指示数据接收失败的情况下，通过该第三终端设备向该第一终端设备重新发送该第一数据。
可选地，第二终端设备根据承载上行信号的第一通道和第一映射关系确定第二通道标识，并将通过第一通道接收的上行数据通过第二通道标识对应的通道发送给该第三终端设备，进而由第三终端设备发送给无线接入网设备，该第一映射关系为至少一个第一通道标识和至少一个第二通道标识一一对应的映射关系。
具体地，第一映射关系为至少一个第一通道标识和至少一个第二通道标识一一对应的映射关系。第一通道标识可以是第一终端设备的承载标识，第二通道标识可以是第二逻辑信道标识，第一终端设备的承载标识对应的承载可以用于第一终端设备与无线接入网设备之间进行通信，第二逻辑信道标识对应的逻辑信道可以用于第二终端设备和第三终端设备 之间进行通信。第一终端设备和无线接入网设备之间的承载可以是1个或多个，第二终端设备和第三终端设备之间的逻辑通道也可以是1个或多个。第二终端设备从第一终端设备接收上行数据，并根据承载该上行数据的第一终端设备的承载标识(下述标识为第一终端设备的承载标识)，以及结合该第一映射关系，可以确定在多个第二逻辑信道中的特定第二逻辑信道上发送该上行数据，这样第二终端设备将未成功发送的上行数据有规律的通过第二逻辑信道发送给第三终端设备，以便第三终端设备后续将所述数据转发给无线接入网设备，避免了由于具有中继功能的终端设备改变导致的丢包问题，提高了通信效率。
需要说明的是，若不同第一终端设备的承载标识分别独立编号，则第二终端设备可以根据第一终端设备的标识和第一终端设备的承载标识一起来确定出对应的承载。例如第二中继设备接收无线接入网设备发送的RRC配置消息，所述RRC配置消息包含第一终端设备标识，第一终端的承载标识和第六通道标识的映射关系。其中第六通道是第一终端设备和第二终端设备之间的传输通道，第六通道标识可以是所述传输通道内传输数据使用的逻辑信道标识。第二终端设备通过第六通道接收来自于第一终端设备的数据，获取对应的第六通道的逻辑信道标识。接着第二终端设备根据所述逻辑信道标识，以及所述映射关系，获取对应的第一终端设备的承载标识。
应理解，在不作特别说明的情况下，本申请实施例中的承载可以是SRB，或DRB。本申请实施例中的具有中继功能的终端设备之间的通道或者第一终端设备与具有中继功能的终端设备之间的通道可以是逻辑通道，下述实施例以逻辑通道为例进行说明，本申请对此不进行限定。
可选地，第二终端设备根据承载下行信号的第三通道、该第一映射关系和第二映射关系，确定第二通道标识，并将通过第三通道接收的下行数据通过该第二通道标识对应的第二通道发送给第三终端设备，进而由第三终端设备发送给第一终端设备，该第一映射关系为至少一个第一通道标识和至少一个第二通道标识一一对应的映射关系，该第二映射关系为至少一个第三通道标识和至少一个第一通道标识的一一对应的映射关系。
具体地，第一通道标识可以是第一终端设备的承载标识，第二通道标识可以是第二逻辑信道标识，第三通道标识可以是第二终端设备的承载标识，第一终端设备的承载标识对应的承载可以用于第一终端设备与无线接入网设备之间进行通信，第二逻辑信道标识对应的逻辑信道可以用于第二终端设备和第三终端设备之间进行通信，第二终端设备的承载标识对应的承载可以用于第二终端设备和无线接入网设备之间进行通信。第一终端设备和无线接入网设备之间的承载可以是1个或多个，第二终端设备和第三终端设备之间的逻辑通道也可以是1个或多个，第二终端设备和无线接入网设备之间的承载也可以是1个或多个。第二终端设备从无线接入网设备接收下行数据，该下行数据承载在第三通道(即第二终端设备的承载)，第二终端设备根据该第三信道和第三映射关系，确定与该第三信道标识对应的第一终端设备的承载标识，再根据第一终端设备的承载标识和第一映射关系，确定第二通道标识(即第二逻辑信道标识)，进而将该下行数据承载在该第二逻辑信道标识对应的第二逻辑信道，这样第二终端设备将未成功发送的下行信号有规律的通过第二逻辑信道发送给第三终端设备，并由第三终端设备转发给第一终端设备，避免了由于具有中继功能的终端设备改变导致的丢包问题，提高了通信效率。
可选地，该第一映射关系可以是第二终端设备确定的，并发送给第三终端设备；或者 该第一映射关系为无线接入网设备确定的，并分别发送给该第二终端设备和该第三终端设备。
可选地，无线接入网设备可以只向第二终端设备发送该第一映射关系，第二终端设备向该第三终端设备发送该第一映射关系。具体地，第二终端设备可以向第三终端设备发送SCI，该SCI携带该第一映射关系，避免了单独发送该第一映射关系，节省了信令开销。
可选地，该第二映射关系可以是由无线接入网设备发送给第二终端设备。
可选地，第三终端设备可以根据第二逻辑通道标识、该第一映射关系和第三映射关系，确定第四通道，该第一映射关系为至少一个第一通道标识和至少一个第二通道标识一一对应的映射关系，该第三映射关系为至少一个第四通道的标识和至少一个第一通道标识的映射关系。
具体地，第二终端设备向无线接入网设备发送待发送的上行数据时，第二终端设备可以将上行数据发送给第三终端设备，由第三终端设备向该无线接入网设备转发该上行数据号。第四通道为第三终端设备和无线接入网设备之间的通道，在第一通道标识为第一终端设备的承载标识，第四通道标识为第三终端设备的承载标识的情况下，该第一映射关系为至少一个第一终端设备的承载标识和至少一个第二逻辑信道标识一一对应的映射关系，第三映射关系为至少一个第三终端设备的承载标识和至少一个第一终端设备的承载标识一一对应的映射关系。这样第三终端设备可以根据第二逻辑信道标识和第一映射关系确定第一终端设备的承载标识，再根据第一终端设备的承载标识和该第三映射关系确定出第三终端设备承载标识，进而通过该第三终端设备承载标识对应的承载向该无线接入网设备发送该上行数据，从而提高通信效率。
可选地，第三终端设备可以根据第二通道标识、该第一映射关系和第四映射关系，确定第五通道，该第一映射关系为至少一个第一通道标识和至少一个第二通道标识一一对应的映射关系，该第四映射关系为至少一个第五通道标识与至少一个第一通道标识一一对应的映射关系。
具体地，第二终端设备向第一终端设备待发送的下行数据时，该第三终端设备可以根据第二通道、该第一映射关系和第四映射关系，确定第五通道。所述第五信道用于所述第一终端设备与所述第三终端设备进行通信，第五通道可以是第五逻辑通道。在第一通道标识为第一终端设备的承载标识的情况下，第一映射关系为至少一个第一终端设备的承载标识和至少一个第二逻辑信道标识一一对应的映射关系，第四映射关系为至少一个第五逻辑通道标识和至少一个第一终端设备的承载标识一一对应的映射关系。这样第三终端设备可以根据第二逻辑通道和第一映射关系确定第一终端设备的承载标识，再根据第一终端设备的承载标识和该第四映射关系确定第五逻辑通道标识，进而通过该第五逻辑通道标识对应的逻辑通道向该第一终端设备发送下行数据，从而提高通信效率。
可选地，该第三映射关系或该第四映射关系可以是无线接入网设备确定并发送该第三终端设备的。
可选地，该第三映射关系或该第四映射关系也可以携带在RRC重配置消息中。
可选地，第一终端设备在从第二终端设备切换到第三终端设备之后，第二终端设备未转发的上行信号或下行信号可以通过第三终端设备进行转发。具体地，无线接入网设备可以进行下行数据重发，第一终端设备进行上行数据重发；或者无线接入网设备进行下行数 据重发，第二终端设备进行上行数据重发(即第二终端设备将上行数据转发到第三终端设备，第三终端设备将上行数据发送给无线接入网设备)；或者第二终端设备进行下行数据重发(即第二终端设备将下行数据转发给第三终端设备，通过第三终端设备发送给第一终端设备)，第一终端设备进行上行数据重发；或者第二终端设备进行下行数据重发，以及第二终端设备进行上行数据重发。
在本申请的一个实施例中，第一终端设备确定第四终端设备，该第四终端设备为能够与该第二终端设备或该第三终端设备为该第一终端设备和该无线接入网设备提供中继服务的中继设备，该第一终端设备通过该第四终端设备向该无线接入网设备发送用于指示该第四终端设备能够与该第二终端设备或该第三终端设备同时为该第一终端设备和该无线接入网设备提供中继服务的通知信息。
具体地，第一终端设备在发现第四终端设备也能够为第一终端设备和无线无线接入网设备提供中继服务的情况下，第一终端设备可以进行中继设备的添加(relay addition)，即第一终端设备建立中继多连接。例如，第一终端设备可以分别与作为中继设备的第四终端设备和作为中继设备的第二终端设备同时建立连接，或者第一终端设备可以分别与第四终端设备和第三终端设备同时建立连接，并通过该第四终端设备通知无线接入网设备，这样无线接入网设备可以通过第二终端设备和第四终端设备同时向第一终端设备发送下行数据，或者通过第三终端设备和第四终端设备同时向第一终端设备发送下行数据，从而提高了通信效率。
需要说明的是，若当前为第一终端设备和无线接入网设备提供中继服务的是第二终端设备，则添加第四终端设备之后，第二终端设备和第四终端设备同时为第一终端设备和无线接入网设备提供中继服务。若当前为第一终端设备和无线接入网设备提供中继服务的是第三终端设备，则添加第四终端设备之后，第三终端设备和第四终端设备同时为第一终端设备和无线接入网设备提供中继服务。
图6示出了本申请另一个实施例的中继通信的方法的示意性流程图。
需要说明的是，图6所示的实施例与上述实施例中，除作特别说明之外，相同术语表示的含义相同。
601，第一终端设备接收指示信息，该指示信息用于指示该第一终端设备需要更换第二终端设备，该第二终端设备为当前为该第一终端设备提供中继服务的设备，且该指示信息携带该第一终端设备能够更换的至少一个终端设备。相应地，无线接入网设备发送该指示信息。
具体地，第二终端设备为当前为第一终端设备和无线接入网通信提供中继服务的设备，该指示信息携带该第一终端设备能够更换的至少一个终端设备，该至少一个终端设备可以以列表的形式携带在该指示信息中。
可选地，该第一终端设备与该第二终端设备通信的接口为PC5接口或边链路接口。
具体地，该第二终端设备与该第一终端设备的接口为边链路接口或PC5接口，例如如图2或图3所示，换句话说，该第二终端设备可以是终端设备类型的设备。第二终端设备与无线接入网设备之间的接口为空口，例如可以是LTE空口或NR空口。
可选地，无线接入网设备检测该第一终端设备与该第二终端设备之间的信号质量，在该第一终端设备与该第二终端设备之间的信号质量小于或等于第一预设阈值的情况下，生 成该指示信息。
具体地，无线接入网设备在检测到第一终端设备和第二终端设备之间的信号质量较差，例如，无线接入网设备从第二终端设备获知第二终端设备和第一终端设备之间的信号质量，或者经由第二终端设备转发的第一终端设备测量得到的该第二终端设备和该第一终端设备之间的信号质量。
可选地，该无线接入网设备检测该无线接入网设备与该第二终端设备之间的信号质量，在该无线接入网设备与该第二终端设备之间的信号质量小于或等于第二预设阈值的情况下，生成该指示信息。
具体地，无线接入网设备检测到无线接入网设备与该第二终端设备之间的信号较差，例如，无线接入网设备通过测量第二终端设备的上行信号(探测参考信号(sounding reference signal，SRS))的质量，或者第二终端设备上报的3GPP标准定义的层3的测量报告(例如，参考信号接收功率(reference signal receiving power，RSRP)或参考信号接收质量(reference signal receiving quality，RSRQ))，或者层2的信道状态信息(channel state information，CSI)反馈(例如，信道质量指示(channel quality indicator，CQI)/预编码矩阵指示(Precoding Matrix Indicator，PMI)/秩指示(rank indication，RI))。
应理解，层2可以是MAC层、RCL层、PDCP层或适配层中的至少一项；层3可以是RRC层或RRC层以上的层，例如，IP层，UDP层/TCP层，或应用层。
可选地，在无线接入网设备和第一终端设备之间存在直接空口(例如，小区覆盖内(in cellular coverage，ICC)场景)，则无线接入网设备可以直接向第一终端设备发送该指示信息。例如，无线接入网设备可以通过RRC重配置消息携带该指示信息。
可选地，无线接入网设备可以通过第二终端设备向第一终端设备发送该指示信息。例如，小区覆盖外(out of cellular coverage，OCC)场景。无线接入网设备也可以通过第二终端设备向第一终端设备发送RRC重配置消息，该RRC重配置消息携带该指示信息。
602，该第一终端设备根据该指示信息，从该至少一个终端设备中确定第三终端设备。
具体地，该第三终端设备与第一终端设备之间的接口也是PC5接口(或称边链路接口)，第三终端设备和无线接入网设备之间的接口可以是LTE空口或NR空口。
可选地，该第一终端设备进行从该第二终端设备到第三终端设备的切换。
具体地，该切换可以理解为第一终端设备由通过第二终端设备接入到接入网设备变换为通过第三终端设备接入到接入网设备。
603，该第一终端设备通过该第三终端设备向无线接入网设备发送通知信息，该通知信息用于指示该第一终端设备通过该第三终端设备连接到无线接入网设备。
具体地，第一终端设备在接收到无线接入网设备发送的用于指示第一终端设备需要更换第二终端设备的指示信息，且该指示信息还携带能够更换的至少一个终端设备，这样第一终端设备根据该指示信息能够选择合适的第三终端设备，避免了第一终端设备主动寻找合适的第三终端设备，节省了第一终端设备的功耗，通过合适的第三终端设备进行通信，也提高了第一终端设备和无线接入网设备的通信效率。
图7示出了本申请又一个实施例的中继通信的示意性流程图。
应理解，在不作特别说明的情况下，本申请实施例中与上述实施例中相同的术语表示的含义相同。
还应理解，本申请实施例可以单独执行，还可以结合上述任意可以结合的方案，本申请对此不进行限定。
需要说明的是，本申请实施例应用于包括第一终端设备、第二终端设备、第三终端设备和无线接入网设备的通信系统中，该第三终端设备为当前为第一终端设备和无线接入网设备提供中继服务的设备，该第二终端设备为在该第三终端设备之前为该第一终端设备和该无线接入网设备提供中继服务的设备。
701，该第二终端设备接收属于该第一终端设备的数据。
具体地，属于该第一终端设备的数据可以是第二终端设备没有转发成功的数据，也可以是还没有转发的数据。此外，该第一终端设备的数据可以是上行数据，也可以是下行数据，本申请对此不进行限定。
702，该第二终端设备向该第三终端设备发送第一消息，该第一消息包括该第一终端设备的数据和通知信息，该通知信息用于指示该第一终端设备的标识、数据无线承载DRB标识和方向指示信息，所述DRB标识用于指示所述第一终端设备和所述无线接入网设备之间承载该第一终端设备的数据的DRB，所述方向指示信息用于指示所述第一终端设备的数据的传输方向。
具体地，第一终端设备和无线接入网设备之间进行通信的承载可以有多个，该承载可以是DRB，其中该第一消息携带第一终端设备的某一个数据(下述表示为第一终端设备的数据)对应的承载标识、该第一终端设备的标识、方向指示信息，该方向指示信息可以指示所述属于第一终端设备的数据为上行数据还是下行数据。如果是上行数据，则第三中继设备后续将所述数据转发给无线接入网设备。如果是下行数据，则第三中继设备后续将所述数据转发给第一终端设备。此外，该第一终端设备的数据和通知信息可以携带在同一个消息(即第一消息)中，这样第三终端设备接收到该第一消息，就可以获知第一消息中包括的数据为哪个终端设备的数据，以及该第一终端设备的数据对应的DRB标识，以使得第三终端设备根据该第一消息能够准确的确定出将该第一终端设备的数据发送到哪个接收端(例如，上行的数据发送到无线接入网设备，下行的数据发送到该第一终端设备)，以及采用哪个通道(即第三终端设备和无线接入网设备之间的某一个通道，或者第三终端设备和第一终端设备之间的某一个通道)，从而提高了通信效率。
在一个实施例中，该通知信息可以携带在SCI中，这样SCI和该第一终端设备的数据可以在同一个消息中，且传输该SCI和传输该第一终端设备的数据的时间可以相同，也可以不同，例如，传输SCI的时域资源在传输该第一终端设备的数据的时域资源之前。
应理解，该时域资源可以是以至少一个时域符号为单位，其中，12或14个时域符号组成一个传输时间单元，这个时间传输单元在LTE中占用1ms，称为包含两个时隙的一个子帧，在NR中也占用1ms，但称为一个时隙，本申请对此不进行限定。
在另一个实施例中，该通知信息可以携带在该第一消息中的适配层中。例如第二中继设备在给第三中继设备发送所述属于第一终端设备的数据时，在所述数据外封装PC5接口的适配层头、RLC头、MAC头以及PHY头，并在适配层中包含第一终端设备的标识，第一终端设备的承载标识以及方向指示信息。特别地，方向指示信息可能是UL或DL指示，也可能是当携带方向指示信息则表示为UL，未携带方向指示信息则表示DL。或者当携带方向指示信息则表示为DL，未携带方向指示信息则表示UL。
具体地，第二终端设备可以经过适配层对该第一终端设备的数据与该通知信息进行封装得到该第一消息，并将该第一消息发送给第三终端设备，第三终端设备从该适配层解析得到该通知信息。
在另一个实施例中，该通知信息可以携带在该第一消息中的MAC层或其他层中。
上文中详细描述了根据本申请实施例的中继通信的方法，下面将描述本申请实施例的中继通信的装置。
图8示出了本申请实施例的中继通信的装置800的示意性框图。
应理解，该装置800可以对应于图4所示的实施例中的终端设备，可以具有方法中的第一终端设备的任意功能。该装置800，包括接收模块810和发送模块820。
接收模块810，用于从第二终端设备接收指示信息，该指示信息用于指示停止提供第一终端设备与无线接入网设备之间的中继服务；
发送模块820，还用于通过第三终端设备向该无线接入网设备发送通知信息，该通知信息指示该第一终端设备通过该第三终端设备连接到该无线接入网设备。
可选地，该指示信息指示该第二终端设备和该无线接入网设备之间的信号质量小于或等于预设质量阈值。
可选地，该指示信息指示该第二终端设备和该无线接入网设备之间发生无线链路失败。
可选地，该指示信息还指示该第三终端设备的标识，该装置800还包括处理模块830，该处理模块830，用于根据该第三终端设备的标识，确定该第三终端设备。
可选地，该通知信息还指示该第一终端设备的标识。
可选地，该发送模块810，还用于向该第二终端设备发送该第三终端设备的标识。
图9示出了本申请实施例提供的中继通信的装置900的示意框图，该装置900可以为图1所述的终端设备和图4所述的终端设备。该装置可以采用如图9所示的硬件架构。该装置可以包括处理器910和收发器920，可选地，该装置还可以包括存储器930，该处理器910、收发器920和存储器930通过内部连接通路互相通信。图8中的处理模块830所实现的相关功能可以由处理器910来实现，接收模块810和发送模块820所实现的相关功能可以由处理器910控制收发器920来实现。
可选地，该处理器910可以是一个通用中央处理器(central processing unit，CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，专用处理器，或一个或多个用于执行本申请实施例技术方案的集成电路。或者，处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。例如可以是基带处理器、或中央处理器。基带处理器可以用于对通信协议以及通信数据进行处理，中央处理器可以用于对中继通信的装置(如，基站、终端设备、或芯片等)进行控制，执行软件程序，处理软件程序的数据。
可选地，该处理器910可以包括是一个或多个处理器，例如包括一个或多个中央处理单元(central processing unit，CPU)，在处理器是一个CPU的情况下，该CPU可以是单核CPU，也可以是多核CPU。
该收发器920用于发送信号，以及接收信号。该收发器可以包括发射器和接收器，发射器用于发送信号，接收器用于接收信号。应理解，信号可以是数据和/或信令。
该存储器930包括但不限于是随机存取存储器(random access memory，RAM)、只读存储器(read-only memory，ROM)、可擦除可编程存储器(erasable programmable read only memory，EPROM)、只读光盘(compact disc read-only memory，CD-ROM)，该存储器930用于存储相关指令及数据。
存储器930用于存储终端设备的程序代码和数据，可以为单独的器件或集成在处理器910中。
具体地，所述处理器910用于控制收发器与无线接入网设备进行信息传输。具体可参见方法实施例中的描述，在此不再赘述。
可以理解的是，图9仅仅示出了用于中继通信的装置的简化设计。在实际应用中，该装置还可以分别包含必要的其他元件，包含但不限于任意数量的收发器、处理器、控制器、存储器等，而所有可以实现本申请的终端设备都在本申请的保护范围之内。
在一种可能的设计中，该装置900可以是芯片，例如可以为可用于终端设备中的通信芯片，用于实现终端设备中处理器910的相关功能。该芯片可以为实现相关功能的现场可编程门阵列，专用集成芯片，系统芯片，中央处理器，网络处理器，数字信号处理电路，微控制器，还可以采用可编程控制器或其他集成芯片。该芯片中，可选的可以包括一个或多个存储器，用于存储程序代码，当所述代码被执行时，使得处理器实现相应的功能。
在具体实现中，作为一种实施例，装置900还可以包括输出设备和输入设备。输出设备和处理器910通信，可以以多种方式来显示信息。例如，输出设备可以是液晶显示器(liquid crystal display，LCD)，发光二级管(light emitting diode，LED)显示设备，阴极射线管(cathode ray tube，CRT)显示设备，或投影仪(projector)等。输入设备和处理器801通信，可以以多种方式接收用户的输入。例如，输入设备可以是鼠标、键盘、触摸屏设备或传感设备等。
图10示出了本申请实施例的中继通信的装置1000的示意性框图。
应理解，该装置1000可以对应于图4所示的实施例中的终端设备，可以具有方法中的第二终端设备的任意功能。该装置1000，包括处理模块1010和发送模块1020。
处理模块1010，用于生成指示信息，该指示信息用于指示停止提供第一终端设备和无线接入网设备之间的中继服务；
发送模块1020，用于向该第一终端设备发送该指示信息。
可选地，该指示信息指示第二终端设备和该无线接入网设备之间的信号质量小于预设阈值。
可选地，该指示信息指示第二终端设备和该无线接入网设备之间发生无线链路失败。
可选地，该发送模块1020，还用于向第三终端设备发送该第一终端设备的待发送数据，该第三终端设备为当前为该第一终端设备和该无线接入网设备提供中继服务的设备，第二终端设备为之前为该第一终端设备和该无线接入网设备提供中继服务的设备。
可选地，该发送模块1020具体用于：
发送第一消息，该第一消息包括该待发送数据，且该第一消息还包括该第一终端设备的标识、第一通道的标识和传输方向指示信息，该第一通道用于该第一终端设备和该无线接入网设备之间进行通信。
图11示出了本申请实施例提供的中继通信的装置1100，该装置1100可以为图4中 所述的第二终端设备。该装置可以采用如图11所示的硬件架构。该装置可以包括处理器1110和收发器1120，可选地，该装置还可以包括存储器1130，该处理器1110、收发器1120和存储器1130通过内部连接通路互相通信。图10中的处理模块1010所实现的相关功能可以由处理器1110来实现，发送模块1020所实现的相关功能可以由处理器1110控制收发器1120来实现。
可选地，处理器1110可以是一个通用中央处理器(central processing unit，CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，专用处理器，或一个或多个用于执行本申请实施例技术方案的集成电路。或者，处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。例如可以是基带处理器、或中央处理器。基带处理器可以用于对通信协议以及通信数据进行处理，中央处理器可以用于对中继通信的装置(如，基站、终端设备、或芯片等)进行控制，执行软件程序，处理软件程序的数据。
可选地，该处理器1110可以包括是一个或多个处理器，例如包括一个或多个中央处理单元(central processing unit，CPU)，在处理器是一个CPU的情况下，该CPU可以是单核CPU，也可以是多核CPU。
该收发器1120用于发送信号，以及接收信号。该收发器可以包括发射器和接收器，发射器用于发送信号，接收器用于接收信号。
该存储器1130包括但不限于是随机存取存储器(random access memory，RAM)、只读存储器(read-only memory，ROM)、可擦除可编程存储器(erasable programmable read only memory，EPROM)、只读光盘(compact disc read-only memory，CD-ROM)，该存储器1130用于存储相关指令及数据。
存储器1130用于存储终端设备的程序代码和数据，可以为单独的器件或集成在处理器1110中。
具体地，所述处理器1110用于控制收发器与无线接入网设备进行信息传输。具体可参见方法实施例中的描述，在此不再赘述。
在具体实现中，作为一种实施例，装置1100还可以包括输出设备和输入设备。输出设备和处理器1110通信，可以以多种方式来显示信息。例如，输出设备可以是液晶显示器(liquid crystal display，LCD)，发光二级管(light emitting diode，LED)显示设备，阴极射线管(cathode ray tube，CRT)显示设备，或投影仪(projector)等。输入设备和处理器801通信，可以以多种方式接收用户的输入。例如，输入设备可以是鼠标、键盘、触摸屏设备或传感设备等。
可以理解的是，图11仅仅示出了用于中继通信的装置的简化设计。在实际应用中，该装置还可以分别包含必要的其他元件，包含但不限于任意数量的收发器、处理器、控制器、存储器等，而所有可以实现本申请的终端设备都在本申请的保护范围之内。
在一种可能的设计中，该装置1100可以是芯片，例如可以为可用于终端设备中的通信芯片，用于实现终端设备中处理器1110的相关功能。该芯片可以为实现相关功能的现场可编程门阵列，专用集成芯片，系统芯片，中央处理器，网络处理器，数字信号处理电路，微控制器，还可以采用可编程控制器或其他集成芯片。该芯片中，可选的可以包括一个或多个存储器，用于存储程序代码，当所述代码被执行时，使得处理器实现相应的功能。
本申请实施例还提供一种装置，该装置可以是终端设备也可以是电路。该装置可以用于执行上述方法实施例中由终端设备所执行的动作。
图12示出了本申请实施例的中继通信的装置1200的示意性框图。
应理解，该装置1200可以对应于图7所示的实施例中的终端设备，可以具有方法中的第二终端设备的任意功能。该装置1200，包括接收模块1210和发送模块1220。
需要说明的是，该装置1200应用于包括第一终端设备、该装置1200、第三终端设备和无线接入网设备的通信系统中，其中，该第三终端设备为当前为该第一终端设备和该无线接入网设备提供中继服务的设备，该第二终端设备为在该第三终端设备之前为该第一终端设备和该无线接入网设备提供中继服务的设备，该装置1200包括：
该接收模块1210，用于接收属于该第一终端设备的数据；
该发送模块1220，还用于向该第三终端设备发送第一消息，该第一消息包括该属于第一终端设备的数据和通知信息，该通知信息用于指示该第一终端设备的标识、数据无线承载DRB标识和方向指示信息，该DRB标识用于识别该第一终端设备和该无线接入网设备之间承载该数据的DRB，该方向指示信息用于指示该数据的传输方向。
可选地，该通知信息携带在侧链路控制信息SCI中，该SCI的时域资源与该属于第一终端设备的数据的时域资源相同，或在该属于第一终端设备的数据的时域资源之前。
可选地，该通知信息携带在该第一消息的适配层中。
图13示出了本申请实施例提供的中继通信的装置1300，该装置1300可以为图7中所述的第二终端设备。该装置可以采用如图13所示的硬件架构。该装置可以包括处理器1310和收发器1320，可选地，该装置还可以包括存储器1330，该处理器1310、收发器1320和存储器1330通过内部连接通路互相通信。图10中的所需要的处理相关功能可以由处理器1310来实现，接收模块1010和发送模块1020所实现的相关功能可以由处理器1310控制收发器1320来实现。
可选地，处理器1310可以是一个通用中央处理器(central processing unit，CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，专用处理器，或一个或多个用于执行本申请实施例技术方案的集成电路。或者，处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。例如可以是基带处理器、或中央处理器。基带处理器可以用于对通信协议以及通信数据进行处理，中央处理器可以用于对中继通信的装置(如，基站、终端设备、或芯片等)进行控制，执行软件程序，处理软件程序的数据。
可选地，该处理器1310可以包括是一个或多个处理器，例如包括一个或多个中央处理单元(central processing unit，CPU)，在处理器是一个CPU的情况下，该CPU可以是单核CPU，也可以是多核CPU。
该收发器1320用于发送信号，以及接收信号。该收发器可以包括发射器和接收器，发射器用于发送信号，接收器用于接收信号。
该存储器1330包括但不限于是随机存取存储器(random access memory，RAM)、只读存储器(read-only memory，ROM)、可擦除可编程存储器(erasable programmable read only memory，EPROM)、只读光盘(compact disc read-only memory，CD-ROM)，该存储器1330用于存储相关指令及数据。
存储器1330用于存储终端设备的程序代码和数据，可以为单独的器件或集成在处理器1310中。
具体地，所述处理器1310用于控制收发器与无线接入网设备进行信息传输。具体可参见方法实施例中的描述，在此不再赘述。
在具体实现中，作为一种实施例，装置1300还可以包括输出设备和输入设备。输出设备和处理器1310通信，可以以多种方式来显示信息。例如，输出设备可以是液晶显示器(liquid crystal display，LCD)，发光二级管(light emitting diode，LED)显示设备，阴极射线管(cathode ray tube，CRT)显示设备，或投影仪(projector)等。输入设备和处理器801通信，可以以多种方式接收用户的输入。例如，输入设备可以是鼠标、键盘、触摸屏设备或传感设备等。
可以理解的是，图13仅仅示出了用于中继通信的装置的简化设计。在实际应用中，该装置还可以分别包含必要的其他元件，包含但不限于任意数量的收发器、处理器、控制器、存储器等，而所有可以实现本申请的终端设备都在本申请的保护范围之内。
在一种可能的设计中，该装置1300可以是芯片，例如可以为可用于终端设备中的通信芯片，用于实现终端设备中处理器1310的相关功能。该芯片可以为实现相关功能的现场可编程门阵列，专用集成芯片，系统芯片，中央处理器，网络处理器，数字信号处理电路，微控制器，还可以采用可编程控制器或其他集成芯片。该芯片中，可选的可以包括一个或多个存储器，用于存储程序代码，当所述代码被执行时，使得处理器实现相应的功能。
本申请实施例还提供一种装置，该装置可以是终端设备也可以是电路。该装置可以用于执行上述方法实施例中由终端设备所执行的动作。
可选地，本实施例中的装置为终端设备时，图14示出了一种简化的终端设备的结构示意图。便于理解和图示方便，图14中，终端设备以手机作为例子。如图14所示，终端设备包括处理器、存储器、射频电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对终端设备进行控制，执行软件程序，处理软件程序的数据等。存储器主要用于存储软件程序和数据。射频电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。需要说明的是，有些种类的终端设备可以不具有输入输出装置。
当需要发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。为便于说明，图14中仅示出了一个存储器和处理器。在实际的终端设备产品中，可以存在一个或多个处理器和一个或多个存储器。存储器也可以称为存储介质或者存储设备等。存储器可以是独立于处理器设置，也可以是与处理器集成在一起，本申请实施例对此不做限制。
在本申请实施例中，可以将具有收发功能的天线和射频电路视为终端设备的收发单元，将具有处理功能的处理器视为终端设备的处理单元。如图14所示，终端设备包括收发单元1410和处理单元1420。收发单元也可以称为收发器、收发机、收发装置等。处理 单元也可以称为处理器，处理单板，处理模块、处理装置等。可选的，可以将收发单元1410中用于实现接收功能的器件视为接收单元，将收发单元1410中用于实现发送功能的器件视为发送单元，即收发单元1410包括接收单元和发送单元。收发单元有时也可以称为收发机、收发器、或收发电路等。接收单元有时也可以称为接收机、接收器、或接收电路等。发送单元有时也可以称为发射机、发射器或者发射电路等。
应理解，收发单元1410用于执行上述方法实施例中终端设备侧的发送操作和接收操作，处理单元1420用于执行上述方法实施例中终端设备上除了收发操作之外的其他操作。
例如，在一种实现方式中，处理单元1420还用于执行本申请实施例中终端设备侧的处理步骤。收发单元1410，用于执行图4中的步骤401和/或步骤402中的收发操作，和/或收发单元1410还用于执行本申请实施例中终端设备侧的其他收发步骤。
当该中继通信的装置为芯片时，该芯片包括收发单元和处理单元。其中，收发单元可以是输入输出电路、通信接口；处理单元为该芯片上集成的处理器或者微处理器或者集成电路。
可选地，该装置为终端设备时，还可以参照图15所示的设备。作为一个例子，该设备可以完成类似于图14中处理器1410的功能。在图15中，该设备包括处理器1501，发送数据处理器1503，接收数据处理器1505。上述实施例中的处理模块830可以是图15中的该处理器1501，并完成相应的功能。上述实施例中的接收模块810、发送模块820可以是图15中的发送数据处理器1503和接收数据处理器1505。虽然图15中示出了信道编码器、信道解码器，但是可以理解这些模块并不对本实施例构成限制性说明，仅是示意性的。
图16示出本实施例的另一种形式。处理装置1600中包括调制子系统、中央处理子系统、周边子系统等模块。本实施例中的通信设备可以作为其中的调制子系统。具体的，该调制子系统可以包括处理器1603，接口1604。其中处理器1603完成上述处理模块810的功能，接口1604完成上述收发模块820的功能。作为另一种变形，该调制子系统包括存储器1608、处理器1603及存储在存储器上并可在处理器上运行的程序，所述处理器执行所述程序时图4、图6和图7所示的实施例的方法。需要注意的是，所述存储器1608可以是非易失性的，也可以是易失性的，其位置可以位于调制子系统内部，也可以位于处理装置1600中，只要该存储器1608可以连接到所述处理器1603即可。
作为本实施例的另一种形式，提供一种计算机可读存储介质，其上存储有指令，该指令被执行时执行上述方法实施例中的方法。
作为本实施例的另一种形式，提供一种包含指令的计算机程序产品，该指令被执行时执行上述方法实施例中的方法。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另 一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
应理解，处理器可以是集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchronous link DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
本申请中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A,B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a,b,或c中的至少一项(个)，可以表示：a,b,c,a-b,a-c,b-c,或a-b-c，其中a,b,c可以是单个，也可以是多个。
应理解，说明书通篇中提到的“一个实施例”或“一实施例”意味着与实施例有关的特定特征、结构或特性包括在本申请的至少一个实施例中。因此，在整个说明书各处出现的“在一个实施例中”或“在一实施例中”未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序 应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
在本说明书中使用的术语“部件”、“模块”、“系统”等用于表示计算机相关的实体、硬件、固件、硬件和软件的组合、软件、或执行中的软件。例如，部件可以是但不限于，在处理器上运行的进程、处理器、对象、可执行文件、执行线程、程序和/或计算机。通过图示，在计算设备上运行的应用和计算设备都可以是部件。一个或多个部件可驻留在进程和/或执行线程中，部件可位于一个计算机上和/或分布在2个或更多个计算机之间。此外，这些部件可从在上面存储有各种数据结构的各种计算机可读介质执行。部件可例如根据具有一个或多个数据分组(例如来自与本地系统、分布式系统和/或网络间的另一部件交互的二个部件的数据，例如通过信号与其它系统交互的互联网)的信号通过本地和/或远程进程来通信。
还应理解，本文中涉及的第一、第二以及各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围。
应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。其中，单独存在A或B，并不限定A或B的数量。以单独存在A为例，可以理解为具有一个或多个A。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。

Claims (30)

  1. 一种中继通信的方法，其特征在于，包括：
    第一终端设备从第二终端设备接收指示信息，所述指示信息指示停止提供所述第一终端设备与无线接入网设备之间的中继服务；
    所述第一终端设备通过第三终端设备向所述无线接入网设备发送通知信息，所述通知信息指示所述第一终端设备通过所述第三终端设备的中继服务连接到所述无线接入网设备。
  2. 根据权利要求1所述的方法，其特征在于，所述指示信息指示所述第二终端设备和所述无线接入网设备之间的信号质量小于或等于预设质量阈值。
  3. 根据权利要求1所述的方法，其特征在于，所述指示信息指示所述第二终端设备和所述无线接入网设备之间发生无线链路失败。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述指示信息还指示所述第三终端设备的标识，所述方法还包括：
    所述第一终端设备根据所述第三终端设备的标识，确定所述第三终端设备。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述通知信息还指示所述第一终端设备的标识。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述方法还包括：
    所述第一终端设备向所述第二终端设备发送所述第三终端设备的标识。
  7. 一种中继通信的方法，其特征在于，包括：
    第二终端设备生成指示信息，所述指示信息指示停止提供第一终端设备和无线接入网设备之间的中继服务；
    所述第二终端设备向所述第一终端设备发送所述指示信息。
  8. 根据权利要求7所述的方法，其特征在于，所述指示信息指示所述第二终端设备和所述无线接入网设备之间的信号质量小于预设阈值。
  9. 根据权利要求7所述的方法，其特征在于，所述指示信息指示所述第二终端设备和所述无线接入网设备之间发生无线链路失败。
  10. 根据权利要求7至9中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二终端设备向第三终端设备发送所述第一终端设备的待发送数据，所述第三终端设备为当前为所述第一终端设备和所述无线接入网设备提供中继服务的设备，所述第二终端设备为之前为所述第一终端设备和所述无线接入网设备提供中继服务的设备。
  11. 根据权利要求10所述的方法，其特征在于，所述第二终端设备向第三终端设备发送所述第一终端设备的待发送数据包括：
    所述第二终端设备发送第一消息，所述第一消息包括所述待发送数据，且所述第一消息还包括在给第三终端设备发送所述待发送数据时携带所述第一终端设备的标识、第一通道的标识和上行指示信息或下行传输方向指示信息，所述第一通道用于所述第一终端设备和所述无线接入网设备之间进行通信。
  12. 一种中继通信的方法，其特征在于，所述方法应用于包括第一终端设备、第二终 端设备、第三终端设备和无线接入网设备的通信系统中，其中，所述第三终端设备为当前为所述第一终端设备和所述无线接入网设备提供中继服务的设备，所述第二终端设备为在所述第三终端设备之前为所述第一终端设备和所述无线接入网设备提供中继服务的设备，所述方法包括：
    所述第二终端设备接收属于所述第一终端设备的数据；
    所述第二终端设备向所述第三终端设备发送第一消息，所述第一消息包括所述第一终端设备的数据和通知信息，所述通知信息用于指示所述第一终端设备的标识、数据无线承载DRB标识和方向指示信息，所述DRB标识用于指示所述第一终端设备和所述无线接入网设备之间承载所述数据的DRB，所述方向指示信息用于指示所述数据的传输方向。
  13. 根据权利要求12所述的方法，其特征在于，所述通知信息携带在侧链路控制信息SCI中，所述SCI占用的时域资源与所述属于第一终端设备的数据的时域资源相同，或所述SCI占用的时域资源在所述属于第一终端设备的数据占用的时域资源之前。
  14. 根据权利要求12所述的方法，其特征在于，所述通知信息携带在所述第一消息的适配层中。
  15. 一种中继通信的装置，其特征在于，包括：
    接收模块，用于从第二终端设备接收指示信息，所述指示信息指示停止提供第一终端设备与无线接入网设备之间的中继服务；
    发送模块，用于通过第三终端设备向所述无线接入网设备发送通知信息，所述通知信息指示所述第一终端设备通过所述第三终端设备的中继服务连接到所述无线接入网设备。
  16. 根据权利要求15所述的装置，其特征在于，所述指示信息指示所述第二终端设备和所述无线接入网设备之间的信号质量小于或等于预设质量阈值。
  17. 根据权利要求15所述的装置，其特征在于，所述指示信息指示所述第二终端设备和所述无线接入网设备之间发生无线链路失败。
  18. 根据权利要求15至17中任一项所述的装置，其特征在于，所述指示信息还指示所述第三终端设备的标识，所述装置还包括：
    处理模块，用于根据所述第三终端设备的标识，确定所述第三终端设备。
  19. 根据权利要求15至18中任一项所述的装置，其特征在于，所述通知信息还指示所述第一终端设备的标识。
  20. 根据权利要求15至19中任一项所述的装置，其特征在于，所述发送模块，还用于向所述第二终端设备发送所述第三终端设备的标识。
  21. 一种中继通信的装置，其特征在于，包括：
    处理模块，用于生成指示信息，所述指示信息指示停止提供第一终端设备和无线接入网设备之间的中继服务；
    发送模块，用于向所述第一终端设备发送所述指示信息。
  22. 根据权利要求21所述的装置，其特征在于，所述指示信息指示第二终端设备和所述无线接入网设备之间的信号质量小于预设阈值。
  23. 根据权利要求21所述的装置，其特征在于，所述指示信息指示第二终端设备和所述无线接入网设备之间发生无线链路失败。
  24. 根据权利要求21至23中任一项所述的装置，其特征在于，所述发送模块，还用 于向第三终端设备发送所述第一终端设备的待发送数据，所述第三终端设备为当前为所述第一终端设备和所述无线接入网设备提供中继服务的设备，第二终端设备为之前为所述第一终端设备和所述无线接入网设备提供中继服务的设备。
  25. 根据权利要求24所述的装置，其特征在于，所述发送模块具体用于：
    发送第一消息，所述第一消息包括所述待发送数据，且所述第一消息还包括所述第一终端设备的标识、第一通道的标识和传输方向指示信息，所述第一通道用于所述第一终端设备和所述无线接入网设备之间进行通信。
  26. 一种中继通信的装置，其特征在于，所述装置应用于包括第一终端设备、所述装置、第三终端设备和无线接入网设备的通信系统中，其中，所述第三终端设备为当前为所述第一终端设备和所述无线接入网设备提供中继服务的设备，所述第二终端设备为在所述第三终端设备之前为所述第一终端设备和所述无线接入网设备提供中继服务的设备，所述装置包括：
    接收模块，用于接收属于所述第一终端设备的数据；
    发送模块，用于向所述第三终端设备发送第一消息，所述第一消息包括所述属于第一终端设备的数据和通知信息，所述通知信息用于指示所述第一终端设备的标识、数据无线承载DRB标识和方向指示信息，所述DRB标识用于识别所述第一终端设备和所述无线接入网设备之间承载所述数据的DRB，所述方向指示信息用于指示所述数据的传输方向。
  27. 根据权利要求26所述的装置，其特征在于，所述通知信息携带在侧链路控制信息SCI中，所述SCI的时域资源与所述属于第一终端设备的数据的时域资源相同，或在所述属于第一终端设备的数据的时域资源之前。
  28. 根据权利要求26所述的装置，其特征在于，所述通知信息携带在所述第一消息的适配层中。
  29. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质包括计算机程序或指令，当所述计算机程序或指令在计算机上运行时，使得计算机执行如权利要求1-6中任一项或权利要求7-11中任一项或权利要求12-14中任一项所述的方法。
  30. 一种计算机程序产品，其特征在于，所述计算机程序产品包括计算机程序或指令，当所述计算机程序或指令在计算机上运行时，使得计算机执行如权利要求1-6中任一项或权利要求7-11中任一项或权利要求12-14中任一项所述的方法。
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