WO2020103641A1 - 一种中继通信方法及装置 - Google Patents

一种中继通信方法及装置

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Publication number
WO2020103641A1
WO2020103641A1 PCT/CN2019/113120 CN2019113120W WO2020103641A1 WO 2020103641 A1 WO2020103641 A1 WO 2020103641A1 CN 2019113120 W CN2019113120 W CN 2019113120W WO 2020103641 A1 WO2020103641 A1 WO 2020103641A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal device
access network
information
network device
wireless access
Prior art date
Application number
PCT/CN2019/113120
Other languages
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.)
Filing date
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 EP19886792.1A priority Critical patent/EP3876603A4/en
Publication of WO2020103641A1 publication Critical patent/WO2020103641A1/zh
Priority to US17/327,007 priority patent/US11968633B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/46—TPC being performed in particular situations in multi hop networks, e.g. wireless relay networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • 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
    • 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
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the embodiments of the present application relate to the communication field, and in particular, to a relay communication method and device.
  • the remote devices can communicate with the wireless access network device through relay devices, thereby reducing the remote devices
  • the relay device here may be a terminal device, and a side link between them.
  • the 3rd Generation Partnership Project (3rd Generation Partnership Project) discusses two-way relays and one-way relays.
  • the so-called two-way relay means that both the upstream data and the downstream data between the remote device and the wireless access network device are forwarded through the relay device.
  • Unidirectional relay means that the upstream data between the remote device and the wireless access network device is forwarded through the relay device, and the downstream data between the wireless access network device and the remote device does not need to be forwarded by the relay device.
  • Embodiments of the present application provide a relay communication method and apparatus, which solves how, in a one-way relay scenario, when a remote device moves within the coverage of a target cell, the remote device accesses the target wirelessly through the relay device The problem of network equipment performing uplink communication.
  • an embodiment of the present application provides a relay communication method, which can be applied to a first wireless access network device, or the method can be applied to a communication that can support the first wireless access network device to implement the method
  • An apparatus for example, the communication apparatus includes a chip system, and the method includes: after the first wireless access network device receives the first information sent by the first terminal device, the first wireless access network device sends to the second wireless access network device Second information.
  • the first information is used to indicate that the first terminal device is a terminal device with limited uplink power
  • the second information is used to indicate the second terminal device that provides the relay service for the first terminal device in the target cell
  • the second wireless access The network device is a wireless access network device to which the target cell to which the first terminal device needs to connect belongs.
  • the first wireless access network device may receive uplink power according to the first terminal device.
  • the indication information of the limited terminal device determines that the first terminal device and the second terminal device are connected to the target cell together, and the second terminal device provides the first terminal device with the relay service in the target cell, thereby realizing that the remote device can still Uplink communication with the target wireless access network device through the relay device.
  • the method further includes: according to the protocol, the first wireless access network device
  • the second terminal device that provides the relay service for the first terminal device in the target cell may be determined according to the first information. Therefore, the first wireless access network device may determine the second terminal device that provides the relay service for the first terminal device in the target cell by implicit indication, and connect the first terminal device and the second terminal device to the target cell together, Can effectively reduce signaling overhead.
  • the method further includes: the first radio access network device may also receive third information sent by the first terminal device, where the third information is used to indicate that the target cell is The first terminal device provides a relay service to the second terminal device. Therefore, the first wireless access network device may determine the second terminal device that provides the relay service for the first terminal device in the target cell by an explicit indication, and connect the first terminal device and the second terminal device to the target cell together.
  • the second information includes the identifier of the first terminal device and the identifier of the second terminal device, or the second information includes the second terminal device Logo. Therefore, so that the second radio access network device determines that the first terminal device and the second terminal device are connected to the target cell together, and the second terminal device provides the first terminal device with the relay service in the target cell.
  • the second information may also include fourth information, and the fourth information is used to instruct the second terminal device to provide the relay service for the first terminal device in the target cell. Therefore, the first radio access network device instructs the second radio access network device to provide the relay service for the first terminal device in the target cell by the second terminal device in an explicit indication manner, and connects the first terminal device and the second terminal device Connect to the target cell together.
  • the method further includes: the first wireless The access network device may also receive the fifth information and the sixth information sent by the second wireless access network device, send the fifth information to the first terminal device, and send the sixth information to the second terminal device.
  • the fifth information includes the target cell identifier and the first cell radio network temporary identifier (cell-radio network temporary identifier, C-RNTI) assigned to the first terminal device
  • the sixth information includes the target cell identifier and is the second terminal device.
  • the allocated second C-RNTI and random access resources Therefore, it is convenient for the first terminal device and the second terminal device to establish a connection with the second radio access network device according to the fifth information and the sixth information, respectively.
  • the fifth information and the sixth information may be encapsulated in the same interface message sent by the second radio access network device to the first radio access network device.
  • signaling overhead can be reduced.
  • an embodiment of the present application provides a relay communication method, which can be applied to a first terminal device, or the method can be applied to a communication device that can support the first terminal device to implement the method, for example, the communication device A chip system is included, and the method includes: the first terminal device sends first information to the first wireless access network device, where the first information is used to indicate that the first terminal device is a terminal device with limited uplink power.
  • the first terminal device may report the first terminal to the first wireless access network device
  • the indication information that the device is a terminal device with limited uplink power so that the first radio access network device can determine that the first terminal device and the second terminal device are based on the indication information that the first terminal device is a terminal device with limited uplink power
  • the second terminal device provides the first terminal device with a relay service in the target cell, so that the remote device can still perform uplink communication with the target wireless access network device through the relay device.
  • the first terminal device determines the second information according to the first information, and sends the second information to the first wireless access network device.
  • the second information is used to indicate the second terminal device that provides the relay service for the first terminal device in the target cell. Therefore, the first radio access network device may determine the second terminal device that provides the relay service for the first terminal device in the target cell through an explicit indication, and connect the first terminal device and the second terminal device to the target cell together.
  • the method further includes: the first terminal device receives the third information, and accesses the second wireless device through the second terminal device according to the third information
  • the target cell of the network device communicates.
  • the third information includes the target cell identity and the first C-RNTI allocated to the first terminal device. Therefore, the first terminal device can establish a connection with the second wireless access network device according to the third information.
  • an embodiment of the present application provides a relay communication method, which can be applied to a second wireless access network device, or the method can be applied to a communication that can support the second wireless access network device to implement the method
  • the communication apparatus includes a chip system, and the method includes: the second radio access network device receives first information sent by the first radio access network device, and the first information is used to indicate that the target cell is providing Following the service of the second terminal device.
  • the second wireless access network device in the case that the first terminal device needs to be connected to the target cell of the second wireless access network device, the second wireless access network device sends The first information determines that the terminal device that provides the relay service for the first terminal device in the target cell is the second terminal device, that is, the first terminal device and the second terminal device will be connected to the target cell together. Therefore, the second radio access network device can allocate resources required for the first terminal device and the second terminal device to connect the first terminal device and the second terminal device together to the target cell.
  • the first terminal device provides a relay service, so that the remote device can still perform uplink communication with the target wireless access network device through the relay device.
  • the first information may include the identification of the first terminal device and the identification of the second terminal device; or, the first information may include the identification of the second terminal device.
  • the second radio access network device determines that the first information is information about the first terminal device and the second terminal device, and the first terminal device and the second terminal device will be connected to the target cell together.
  • the second radio access network device may determine the second terminal device that provides the relay service for the first terminal device in the target cell through an implicit indication manner in which the first information includes the identification of the terminal device, the first terminal device and the second The terminal devices are connected to the target cell together, which can effectively reduce signaling overhead.
  • the method further includes: A radio access network device sends second information and third information, where the second information includes the target cell identity and the first C-RNTI allocated to the first terminal device, and the third information includes the target cell identity and is allocated to the second terminal device The second C-RNTI and random access resources.
  • a radio access network device sends second information and third information, where the second information includes the target cell identity and the first C-RNTI allocated to the first terminal device, and the third information includes the target cell identity and is allocated to the second terminal device The second C-RNTI and random access resources.
  • an embodiment of the present application provides a relay communication method, which can be applied to a first wireless access network device, or the method can be applied to a communication that can support the first wireless access network device to implement the method
  • the communication apparatus includes a chip system, and the method includes: after receiving the first information sent by the first terminal device, the first wireless access network device sends the second information to the second wireless access network device.
  • the first information is used to indicate that the first terminal device is a terminal device with limited uplink power
  • the second information is used to indicate that the second wireless access network device does not need to allocate random access resources for the first terminal device in the target cell
  • the second radio access network device is the radio access network device to which the target cell to which the first terminal device needs to connect belongs.
  • the first wireless access network device may receive uplink power according to the first terminal device.
  • the indication information of the limited terminal device determines whether the uplink from the first terminal device to the first radio access network device is reserved, for example, the first terminal device can maintain the uplink with the first radio access network device through the second terminal device Connection, the first radio access network device transmits the uplink data of the first terminal device to the second radio access network device. Therefore, the remote device can still perform uplink communication with the target wireless access network device through the relay device.
  • the method further includes: the first wireless access network device may The information determines whether the uplink from the first terminal device to the first radio access network device is reserved. Therefore, the first radio access network device can determine whether the uplink from the first terminal device to the first radio access network device is reserved by implicit indication, which can effectively reduce signaling overhead.
  • the method further includes: in a case where the first terminal device needs to be connected to the target cell of the second wireless access network device, the first wireless access network device receives the first Third information sent by a terminal device.
  • the third information is used to indicate whether the uplink from the first terminal device to the first radio access network device is reserved. Therefore, the first radio access network device may determine whether the uplink from the first terminal device to the first radio access network device is reserved through an explicit indication.
  • the method further includes: the first wireless The access network device sends the identifier of the first terminal device to the second wireless access network device. Therefore, so that the second radio access network device determines that the second information is information about the first terminal device.
  • the method further includes: the first wireless The access network device receives the fourth information sent by the second wireless access network device, and sends the fourth information to the first terminal device.
  • the fourth information includes the target cell identity and the first C-RNTI allocated to the first terminal device. Therefore, it is convenient for the first terminal device to establish a connection with the second wireless access network device according to the fourth information.
  • an embodiment of the present application provides a relay communication method, which can be applied to a first terminal device, or the method can be applied to a communication device that can support the first terminal device to implement the method, for example, the communication device A chip system is included, and the method includes: the first terminal device sends first information to the first wireless access network device, where the first information is used to indicate that the first terminal device is a terminal device with limited uplink power.
  • the first terminal device may report the first terminal to the first wireless access network device
  • the indication information that the device is an uplink power limited terminal device so that the first wireless access network device can determine the first terminal device to the first wireless access according to the indication information that the first terminal device is an uplink power limited terminal device
  • the uplink of the network device is reserved, for example, the first terminal device can maintain the uplink connection with the first wireless access network device through the second terminal device, and the first wireless access network device sends the second wireless access network device Transmit uplink data of the first terminal device. Therefore, the remote device can still perform uplink communication with the target wireless access network device through the relay device.
  • the first terminal device determines the second information according to the first information, and sends the second information to the first wireless access network device.
  • the second information is used to indicate whether the uplink from the first terminal device to the first radio access network device is reserved. Therefore, the first radio access network device may determine whether the uplink from the first terminal device to the first radio access network device is reserved through an explicit indication.
  • the method further includes: the first terminal device receives third information, and accesses to the second wireless device through the second terminal device according to the third information
  • the target cell of the network device communicates.
  • the third information includes the target cell identity and the first cell radio network temporary identity C-RNTI allocated to the first terminal device. Therefore, the first terminal device can establish a connection with the second wireless access network device according to the third information.
  • an embodiment of the present application provides a relay communication method, which can be applied to a second wireless access network device, or the method can be applied to a communication that can support a second wireless access network device to implement the method
  • the communication apparatus includes a chip system, and the method includes: the second wireless access network device receives first information sent by the first wireless access network device, and the first information is used to indicate that the second wireless access network device does not need to be The first terminal device allocates random access resources in the target cell.
  • the second wireless access network device sends The first information determines whether the uplink from the first terminal device to the first wireless access network device is reserved. For example, the first terminal device can maintain the uplink connection to the first wireless access network device through the second terminal device.
  • a radio access network device transmits uplink data of the first terminal device to the second radio access network device. Therefore, the second radio access network device can allocate the resources required for the first terminal device to connect to the target cell for the first terminal device, and the second terminal device provides the first terminal device with a relay service in the target cell, so that The end device can still perform uplink communication with the target wireless access network device through the relay device.
  • the method further includes: the second radio access network device receives the identifier of the first terminal device sent by the first radio access network device.
  • the second radio access network device is determined that the first information is information about the first terminal device.
  • the method further includes: The first radio access network device sends second information, where the second information includes the target cell identity and the first C-RNTI allocated to the first terminal device. Therefore, the first wireless access network device transmits the second information to the first terminal device, so that the first terminal device establishes a connection with the second wireless access network device.
  • an embodiment of the present application provides a relay communication method, which can be applied to a second wireless access network device, or the method can be applied to a communication that can support the second wireless access network device to implement the method
  • the communication apparatus includes a chip system, and the method includes: a second radio access network device receives an adaptation layer header equivalent to a second terminal device, and a first load equivalent to the first terminal equipment, the adaptation layer The header includes the identifier of the first terminal device and the identifier of the data radio bearer that the first terminal device and the second wireless access network device are equivalent to, or the adaptation layer header includes the identifier of the first terminal device and the first terminal device and The identification of the logical channel of the two terminal devices; the second wireless access network device determines the second wireless connection according to the identification of the first terminal device and the identification of the data radio bearer that the first terminal device and the second wireless access network device are equivalent
  • target cell identity described in the foregoing embodiments may be determined by the first radio access network device or the second radio access network device.
  • the target cell may be determined by the source base station. Assuming that the source base station is the first radio access network device and the target base station is the second radio access network device, the handover request message sent by the first radio access network device to the second radio access network device may be Carry the target cell identity (target cell identity).
  • the primary base station sends the measurement report to the secondary base station.
  • the secondary base station selects a cell from the cells included in the measurement report as the primary cell (PSCell), that is, the primary cell in the secondary base station.
  • Other individual cells may be selected as secondary cells (SCells), that is, secondary cells in the secondary base station.
  • the primary base station determines a secondary cell set (Secondary Cell Group, SCG), that is, the primary base station determines all cell sets of the secondary base station, the primary base station sends the secondary cell set to the secondary base station, and then the secondary base station selects a cell from the SCG
  • SCG Secondary Cell Group
  • the primary base station may be a first radio access network device
  • the secondary base station may be a second radio access network device.
  • an embodiment of the present application further provides a communication device, configured to implement the method described in the first aspect or the fourth aspect.
  • the communication device is a first wireless access network device or a communication device that supports the first wireless access network device to implement the method described in the first or fourth aspect, for example, the communication device includes a chip system.
  • the communication device includes: a receiving unit and a sending unit.
  • the receiving unit is configured to receive first information sent by the first terminal device, and the first information is used to indicate that the first terminal device is a terminal device with limited uplink power.
  • the sending unit is configured to send second information to the second radio access network device, where the second information is used to indicate the second terminal device that provides the relay service for the first terminal device in the target cell, or the second information is used It indicates that the second radio access network device does not need to allocate random access resources for the first terminal device in the target cell.
  • the second radio access network device is the radio access network device to which the target cell to which the first terminal device needs to connect belongs.
  • the specific method is the same as the corresponding description in the first aspect or the fourth aspect, which is not repeated here.
  • the communication apparatus may further include a processing unit configured to determine the second terminal device that provides the relay service for the first terminal device in the target cell according to the first information.
  • an embodiment of the present application further provides a communication device, configured to implement the method described in the second aspect or the fifth aspect.
  • the communication device is a first terminal device and / or a communication device that supports the first terminal device to implement the method described in the second or fifth aspect, for example, the communication device includes a chip system.
  • the communication device includes: a transmission unit.
  • the sending unit is configured to send first information to the first wireless access network device, where the first information is used to indicate that the first terminal device is a terminal device with limited uplink power.
  • the specific method is the same as the corresponding description in the second aspect or the fifth aspect, which will not be repeated here.
  • the communication device may further include a processing unit.
  • the processing unit is configured to determine second information according to the first information, and the second information is used to indicate the second terminal device that provides the relay service for the first terminal device in the target cell. Alternatively, the second information is used to indicate whether the uplink from the first terminal device to the first radio access network device is reserved.
  • the sending unit is also used to send second information to the first wireless access network device.
  • an embodiment of the present application further provides a communication device, configured to implement the methods described in the third and sixth aspects, and the seventh aspect.
  • the communication device is a second radio access network device and / or a communication device supporting the second radio access network device to implement the methods described in the third and sixth aspects, and the seventh aspect, for example, the communication device includes a chip system.
  • the communication device includes: a receiving unit. The receiving unit is configured to receive first information sent by the first wireless access network device, where the first information is used to indicate that the second wireless access network device does not need to allocate random access resources for the first terminal device in the target cell, Alternatively, the first information is used to indicate the second terminal device that provides the relay service for the first terminal device in the target cell.
  • the communication device may further include a processing unit.
  • the processing unit is configured to determine the data on the second wireless access network device and the first terminal device based on the identifier of the first terminal device and the identifier of the data radio bearer that the first terminal device is equivalent to the second wireless access network device
  • the PDCP layer entity corresponding to the radio bearer identifier or, based on the identifier of the first terminal device and the identifier of the logical channel between the first terminal device and the second terminal device, determine the logic between the first terminal device and the second radio access network device
  • the PDCP layer entity corresponding to the channel identifier determine the logic between the first terminal device and the second radio access network device.
  • the above functional modules of the eighth to tenth aspects may be implemented by hardware, or may be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • a transceiver is used to complete the functions of the receiving unit and the sending unit
  • a processor is used to complete the functions of the processing unit
  • a memory is used by the processor to process program instructions of the method of the embodiments of the present application.
  • the processor, transceiver and memory are connected through the bus and complete the communication with each other.
  • an embodiment of the present application further provides a communication device, configured to implement the method described in the first aspect or the fourth aspect.
  • the communication device is a first wireless access network device or a communication device that supports the first wireless access network device to implement the method described in the first or fourth aspect, for example, the communication device includes a chip system.
  • the communication device includes a processor for implementing the functions of the method described in the first aspect or the fourth aspect.
  • the communication device may further include a memory for storing program instructions and data.
  • the memory is coupled to the processor, and the processor may call and execute program instructions stored in the memory to implement the functions in the method described in the first aspect or the fourth aspect.
  • the communication device may further include a communication interface used for the communication device to communicate with other devices. Exemplarily, if the communication device is a first wireless access network device, the other device is a first terminal device.
  • the communication device includes a communication interface, and the communication interface is used for the communication device to communicate with other devices.
  • the communication interface may be a transceiver for receiving first information sent by a first terminal device, where the first information is used to indicate that the first terminal device is a terminal device with limited uplink power.
  • the transceiver is also used to send second information to the second radio access network device, where the second information is used to indicate the second terminal device that provides the relay service for the first terminal device in the target cell, or the second information is used It indicates that the second radio access network device does not need to allocate random access resources for the first terminal device in the target cell.
  • the second radio access network device is the radio access network device to which the target cell to which the first terminal device needs to connect belongs.
  • the specific method is the same as the corresponding description in the first aspect or the fourth aspect, which is not repeated here.
  • the communication device may further include a processor.
  • the processor is configured to determine a second terminal device that provides a relay service for the first terminal device in the target cell according to the first information.
  • an embodiment of the present application further provides a communication device, configured to implement the method described in the second aspect or the fifth aspect.
  • the communication device is a first terminal device and / or a communication device that supports the first terminal device to implement the method described in the second or fifth aspect, for example, the communication device includes a chip system.
  • the communication device includes a processor for implementing the functions in the method described in the second or fifth aspect.
  • the communication device may further include a memory for storing program instructions and data.
  • the memory is coupled to the processor, and the processor can call and execute program instructions stored in the memory to implement the functions in the method described in the second aspect or the fifth aspect.
  • the communication device may further include a communication interface used for the communication device to communicate with other devices. Exemplarily, if the communication device is a first terminal device, the other device is a first wireless access network device.
  • the communication device includes a communication interface, and the communication interface is used for the communication device to communicate with other devices.
  • the communication interface may be a transceiver.
  • the memory is used to store program instructions.
  • the transceiver is used to send first information to the first wireless access network device, and the first information is used to indicate that the first terminal device is a terminal device with limited uplink power.
  • the communication device may further include a processor.
  • the processor is configured to determine second information according to the first information, and the second information is used to indicate the second terminal device that provides the relay service for the first terminal device in the target cell.
  • the second information is used to indicate whether the uplink from the first terminal device to the first radio access network device is reserved.
  • the transceiver is also used to send second information to the first wireless access network device.
  • the specific method is the same as the corresponding description in the second aspect or the fifth aspect, which will not be repeated here.
  • an embodiment of the present application further provides a communication device, configured to implement the methods described in the third and sixth aspects, and the seventh aspect.
  • the communication device is a second radio access network device and / or a communication device supporting the second radio access network device to implement the methods described in the third and sixth aspects, and the seventh aspect, for example, the communication device includes a chip system.
  • the communication device includes a processor for implementing the functions in the methods described in the third and sixth aspects, and the seventh aspect.
  • the communication device may further include a memory for storing program instructions and data.
  • the memory is coupled to the processor, and the processor can call and execute program instructions stored in the memory to implement the functions in the methods described in the third and sixth aspects, and the seventh aspect.
  • the communication device may further include a communication interface used for the communication device to communicate with other devices. Exemplarily, if the communication device is a second wireless access network device, the other device is a first wireless access network device.
  • the communication device includes a communication interface, and the communication interface is used for the communication device to communicate with other devices.
  • the communication interface may be a transceiver.
  • the memory is used to store program instructions.
  • the transceiver is used to receive first information sent by the first wireless access network device, and the first information is used to indicate that the second wireless access network device does not need to allocate random access resources for the first terminal device in the target cell, or, The first information is used to indicate the second terminal device that provides the relay service for the first terminal device in the target cell.
  • the communication device may further include a processor.
  • the processor is configured to determine data on the second radio access network device and the first terminal device based on the identifier of the first terminal device and the identifier of the data radio bearer that the first terminal device is equivalent to the second radio access network device
  • the PDCP layer entity corresponding to the radio bearer identifier or, based on the identifier of the first terminal device and the identifier of the logical channel between the first terminal device and the second terminal device, determine the logic between the first terminal device and the second radio access network device
  • the PDCP layer entity corresponding to the channel identifier determine the logic between the first terminal device and the second radio access network device.
  • an embodiment of the present application further provides a computer-readable storage medium, including: computer software instructions; when the computer software instructions run in the communication device, the communication device performs any of the first to seventh aspects A described method.
  • an embodiment of the present application further provides a computer program product containing instructions that, when the computer program product runs in a communication device, causes the communication device to perform the method described in any one of the first aspect to the seventh aspect .
  • an embodiment of the present application provides a chip system.
  • the chip system includes a processor, and may further include a memory, for implementing the first terminal device, the first wireless access network device, or the second wireless device in the above method.
  • the chip system may be composed of chips, or may include chips and other discrete devices, such as amplifiers, digital-to-analog converters, or analog-to-digital converters.
  • an embodiment of the present application further provides a communication system including the first wireless access network device described in the eighth aspect or supporting the first wireless access network device to implement the first aspect described in the first aspect
  • the communication device of the method, and the first terminal device described in the ninth aspect or a communication device supporting the first terminal device to implement the method described in the second aspect, and the second radio access network device described in the tenth aspect or supporting the second radio A communication device that implements the method described in the third aspect or the seventh aspect by an access network device;
  • the communication system includes the first radio access network device described in the eleventh aspect or a communication device that supports the first radio access network device to implement the method described in the first aspect, and the first terminal described in the twelfth aspect A device or a communication device that supports a first terminal device to implement the method described in the second aspect, and the second radio access network device described in the thirteenth aspect or supports the second radio access network device to implement the third or seventh aspect Communication device of the described method.
  • the names of the first terminal device, the first wireless access network device, the second wireless access network device and the communication device do not limit the device itself, and in actual implementation, these devices may appear under other names .
  • the functions of each device are similar to the embodiments of the present application, they fall within the scope of the claims of the present application and their equivalent technologies.
  • FIG. 1 is a simplified structural example diagram of a relay system provided by an embodiment of the present application
  • FIG. 2 is an example diagram of a relay communication scenario provided by an embodiment of the present application.
  • FIG. 3 is a flowchart of a relay communication method provided by an embodiment of the present application.
  • FIG. 5 is a flowchart of yet another relay communication method provided by an embodiment of the present application.
  • FIG. 6 is a flowchart of yet another relay communication method provided by an embodiment of the present application.
  • FIG. 9 is an example diagram of a user plane protocol stack provided by an embodiment of this application.
  • FIG. 10 is another exemplary diagram of a user plane protocol stack provided by an embodiment of the present application.
  • FIG. 11 is another exemplary diagram of a user plane protocol stack provided by an embodiment of this application.
  • FIG. 12 is a diagram illustrating an example of the composition of a relay communication device provided by an embodiment of the present application.
  • FIG. 13 is a diagram showing an example of the composition of a communication device provided by an embodiment of the present application.
  • words such as “exemplary” or “for example” are used as examples, illustrations or explanations. Any embodiments or design solutions described as “exemplary” or “for example” in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design solutions. Rather, the use of words such as “exemplary” or “for example” is intended to present related concepts in a specific manner.
  • FIG. 1 is a simplified structural example diagram of a relay system provided by an embodiment of the present application.
  • the relay system may be a long term evolution (LTE) or a new radio (NR) system, which is used to implement communication between a remote device and a wireless access network device.
  • the relay system may include a remote device 101, a relay device 102, and a wireless access network device 103.
  • the remote device 101 may refer to a device farther away from the wireless access network device 103.
  • the remote device 101 may be connected to the wireless access network device 103 in a wireless manner. Because the remote device 101 is a terminal device with limited uplink power, it cannot be directly connected to the wireless access network device 103, but is connected to the wireless access network device 103 through one or more relay devices 102.
  • the so-called terminal equipment with limited uplink power refers to that, because the transmit power of the terminal equipment is low, the radio access network device cannot directly receive the uplink signal sent by the terminal equipment to the radio access network device.
  • the transmitted uplink signal needs to be forwarded by the relay device.
  • the remote device 101 may establish a wireless communication interface with the relay device 102.
  • the wireless communication interface between the remote device 101 and the relay device 102 it can be divided into a user equipment (UE) type relay device and a base station type relay device.
  • UE-type relay device that is, the relay device and the remote device communicate through a side link (sidelink), using the scheme corresponding to the side link specified in the 3GPP standard, where the side link is also called PC5 in some documents Links, device-to-device (D2D) links, etc.
  • the base station type relay device that is, the relay device and the remote device communicate through the LTE air interface or the NR air interface, use the air interface corresponding solution specified by the 3GPP standard.
  • the relay device 102 closest to the wireless access network device 103 may establish a wireless communication interface (such as an LTE air interface or an NR air interface) with the wireless access network device 103.
  • the remote device 101 when the remote device 101 needs to send user plane data or control plane data to the wireless access network device 103, the remote device 101 can pass the wireless communication interface between the remote device 101 and the relay device 102 (eg, PC5 port ) Send user plane data or control plane data to the relay device 102, the relay device 102 may send the remote device 101 to the wireless access network device 103 through the wireless communication interface between the relay device 102 and the wireless access network device 103 User plane data or control plane data.
  • the wireless access network device 103 when the wireless access network device 103 needs to send user plane data or control plane data to the remote device 101, the wireless access network device 103 may also send the user plane data or control plane data to the remote device 102 to Remote device 101.
  • the relay device is a UE-type relay, that is, a terminal device, or user equipment (user equipment (UE)).
  • UE user equipment
  • the network architecture shown in FIG. 1 is only an exemplary architecture diagram.
  • the network shown in FIG. 1 may include other functional entities, such as a core network Network elements, etc., are not restricted.
  • the wireless access network device 103 may be connected to the core network device in a wireless or wired manner.
  • the core network device and the wireless access network device 103 may be independent and different physical devices, or they may integrate the functions of the core network device and the logical function of the wireless access network device 103 on the same physical device, or may be one
  • the physical device integrates some functions of the core network device and some functions of the wireless access network device 103.
  • the embodiments of the present application do not limit the number of core network devices, network devices, and terminal devices included in the communication system.
  • the remote device 101 in FIG. 1 may be a remote user equipment (remote user equipment, remote UE), such as: a wearable device (smart watch, smart bracelet, etc.), or smart furniture ( Or home appliances), cars in the Internet of Vehicles, robotic arms in the industrial Internet, intelligent fueling equipment, and other devices that are far from the wireless access network device and need to be connected to the wireless access network device through the relay device.
  • remote user equipment remote user equipment
  • UE remote user equipment
  • a wearable device smart watch, smart bracelet, etc.
  • smart furniture Or home appliances
  • the relay device 102 in FIG. 1 may be a relay user equipment (relay user, relay, UE), for example, it may be a variety of handheld devices, in-vehicle devices, wearable devices, computing devices, or wireless devices that have wireless communication functions.
  • Other processing equipment for modems can also include subscriber units, cellular phones, smart phones, wireless data cards, personal digital assistant (PDA) computers, tablet computers, Wireless modem (modem), handheld device (handheld), laptop computer (laptop), cordless phone (cordless phone) or wireless local loop (wireless local loop (WLL) station, machine type communication (machine type communication (MTC ) Terminals, mobile stations (MS), etc., are not restricted.
  • the radio access network device 103 in FIG. 1 may be an entity on the network side for transmitting or receiving signals.
  • the wireless access network device can also be named as an access network device, which is mainly used to implement functions of wireless physical entities, resource scheduling and wireless resource management, wireless access control, and mobility management.
  • the radio access network device may be a radio access network (radio access network, RAN) next-generation base station (generation NodeB, gNB), or an LTE base station eNB or any other access unit.
  • the wireless access network device provides services for the cell, and the remote device communicates with the wireless access network device through the transmission resources (eg, frequency domain resources) used by the cell, and the cell may be wireless A cell corresponding to an access network device (such as a base station).
  • the cell may belong to a macro base station or a base station corresponding to a small cell (small cell).
  • the small cell here may include: a metro cell and a micro cell. ), Pico cells, Femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.
  • the wireless access network device may be other devices that provide wireless communication functions for remote devices.
  • the embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device.
  • an apparatus that provides a wireless communication function for a remote device is called a wireless access network device.
  • Wireless access network equipment and remote equipment can be deployed on land, including indoor or outdoor, handheld or in-vehicle; they can also be deployed on the water; they can also be deployed on airplanes, balloons and satellites in the air.
  • the embodiments of the present application do not limit the application scenarios of the wireless access network device and the remote device.
  • Communication between the wireless access network device and the remote device and between the remote device and the remote device can be through licensed spectrum (licensed spectrum) or unlicensed spectrum (unlicensed spectrum). Spectrum and unlicensed spectrum for communication.
  • the embodiments of the present application do not limit the spectrum resources used between the radio access network device and the remote device.
  • Uplink usually refers to the channel of the signal from the terminal device to the wireless access network device.
  • Downlink usually refers to the channel of the signal from the radio access network device to the terminal device.
  • uplink may refer to a physical channel from a remote device to a relay device and a physical channel from a relay device to a wireless access network device.
  • the downlink may refer to the physical channel from the wireless access network device to the relay device and the physical channel from the relay device to the remote device.
  • the uplink may refer to the physical channel from the remote device to the relay device and the physical channel from the relay device to the wireless access network device.
  • the downlink may refer to the physical channel from the wireless access network device to the remote device.
  • the embodiments of the present application can be applied to a unidirectional relay scenario.
  • the existing relay technology standard stipulates that the remote device can communicate with the wireless access network device through the relay device, the remote device moves from the source wireless access network device's coverage to the target access device. When the network access device is within the coverage area, there is no corresponding regulation on how the remote device communicates with the target radio access network device through the relay device.
  • the embodiments of the present application provide a relay communication method.
  • the basic principle is that when the first wireless access network device receives the first information sent by the first terminal device, it can determine The target cell is a second terminal device that provides a relay service for the first terminal device, and the first information is used to indicate that the first terminal device is a terminal device with limited uplink power, and the first radio access network device sends the second radio access network The device sends second information, which is used to indicate the second terminal device that provides the relay service for the first terminal device in the target cell.
  • the first wireless access network device may receive uplink power according to the first terminal device.
  • the indication information of the limited terminal device determines that the first terminal device and the second terminal device are connected to the target cell together, and the second terminal device provides the first terminal device with the relay service in the target cell, thereby realizing that the remote device can still Uplink communication with the target wireless access network device through the relay device.
  • FIG. 2 is an example diagram of a relay communication scenario provided by an embodiment of the present application.
  • the remote device is the first terminal device
  • any one or more relay devices directly connected to the remote device are the second terminal device
  • the source wireless access network device currently connected to the remote device is the first wireless access Network device
  • the second wireless access network device and the third wireless access network device are adjacent to the first wireless access network device.
  • the target radio access network device that the remote device needs to connect to is the second radio access network
  • the device is taken as an example to specifically explain the relay communication method provided by the embodiment of the present application.
  • a wireless communication interface is established between the first terminal device and the second terminal device, such as a PC5 port or side link, and the first terminal device and the second terminal device may communicate with each other through the PC5 port or side link.
  • a wireless communication interface is established between the second terminal device and the first wireless access network device, such as an LTE air interface or an NR air interface, for example, the LTE air interface may be a Uu interface, and the second terminal device and the first wireless access network device may pass LTE air interface or NR air interface communicate with each other. Or there is no direct wireless communication interface between the second terminal device and the first wireless access network device, but keeps connected with the first wireless access network device through relay of other terminal devices.
  • a wired communication interface is established between the first wireless access network device and the second wireless access network device, such as an X2 interface or an Xn interface, and the first wireless access network device and the second wireless access network device can pass LTE.
  • the X2 interface or NR's Xn interface communicate with each other.
  • the first terminal device or the first radio access network determines that the terminal device that provides the relay service for the first terminal device in the target cell may be the second terminal device.
  • the method may include the following detailed steps.
  • the first terminal device sends the first information to the first wireless access network device.
  • the first terminal device After the first terminal device accesses the first wireless access network device, the first terminal device sends first information to the first wireless access network device, where the first information is used to indicate that the first terminal device is a terminal with limited uplink power device.
  • the first wireless access network device may first send a request message to the first terminal device, and after receiving the request message, the first terminal device sends the first information to the first wireless access network device according to the request message. The embodiment does not limit this. It should be noted that the current first terminal device communicates with the first wireless network device through the second terminal device as a relay.
  • the first information may be indicated by a UE category (ue-category) cell specified in the 3GPP standard to indicate that the first terminal device is an uplink power-limited terminal device, when ue-category is category M1 or category When M2, indicating that the first terminal device is bandwidth limited indicates that the uplink power of the first terminal device is limited; when ue-category is category NB1 or category NB2, the first terminal device is a narrowband Internet of Things (Narrow Band Internet of Things (NB-IoT) to indicate that the uplink power of the first terminal device is limited.
  • NB-IoT narrowband Internet of Things
  • a new category of ue-category may be newly added to directly indicate that the uplink power of the first terminal device is limited.
  • the first terminal device may include the first information in the UE capability information. For example, a new cell uplink power limit (uplink (UL) Power Constrained) is added to the UE Capability Information (UE Capability Information) message.
  • the uplink power limit is used to indicate that the first terminal device is a terminal device with limited uplink power. Or use the ue-category information element in the foregoing example in the terminal device capability information center to indicate that the first terminal device is a terminal device with limited uplink power.
  • the first terminal device may actively send the UE Capability Information message containing the first information to the first wireless access network device, or may be based on a request message sent by the first wireless access network device to the first terminal device
  • the network access device sends a UE Capability Information message containing the first information.
  • the first wireless access network device first sends a UE capability request (UE Capability Enquiry) message to the first terminal device, and then the first terminal device feeds back the UE Capability Information message to the first wireless access network device.
  • the first information may also be included in other radio resource control (RRC) messages.
  • the other RRC messages may be RRC connection requests (RRC connection request or RRC setup request).
  • the first terminal device forwards the first information to the first wireless access network device through the second terminal device.
  • the second terminal device may also carry the identifier of the first terminal device.
  • the identifier of the first terminal device may be the identifier of the first terminal device on the side link or the first radio access network device An identifier assigned by a terminal device, such as a cell-radio network temporary identifier (C-RNTI), so that the first radio access network device determines which terminal device sends the first information.
  • C-RNTI cell-radio network temporary identifier
  • the identifier of the first terminal device may be the identifier of the first terminal device on the side link or the identifier assigned by the first wireless access network device to the first terminal, which is not limited in this application.
  • the first terminal device may include the first information in the header of the protocol layer between the first terminal device and the second terminal device, such as a PC5 port radio link control (RLC) layer, media connection Access control (media) control (MAC) layer, physical (PHY) layer or newly added adaptation (adapation) layer.
  • RLC radio link control
  • MAC media connection Access control
  • PHY physical
  • adapation newly added adaptation
  • the second terminal device adds the first information in the Uu protocol layer between the second terminal device and the first wireless access network device, and may also carry the identification of the first terminal device on the side link Or an identifier allocated by the first radio access network device to the first terminal, for example, C-RNTI, so that the first radio access network device determines which terminal device sends the first information.
  • the identification of the first terminal device on the side link may be understood as the unique identification of the second terminal device capable of identifying the first terminal device.
  • the first terminal device may perform neighbor cell measurement to obtain a connection with the first wireless connection
  • the cell ID of the cell within the coverage of other wireless access network devices adjacent to the network access device and information such as cell signal quality and / or cell signal power.
  • the cell identity of the cell within the coverage of the second radio access network device, and information such as cell signal quality and / or cell signal power, and the cell coverage of the cell within the coverage of the third radio access network device Cell identification, and information such as cell signal quality and / or cell signal power.
  • the first terminal device may send a measurement report to the first radio access network device, where the measurement report includes the cell identities of N cells and the signal quality and / or signal power of the N cells measured by the first terminal device, where N is greater than An integer of 0.
  • the first terminal device may also measure the relay device adjacent to the first terminal device to obtain the identifier of the relay device, and the signal quality and / or signal power.
  • the relay device adjacent to the first terminal device may be a relay device within the coverage of the first radio access network device, and a relay device within the coverage of the neighboring cell measured by the first terminal device.
  • the measurement report may also include relay information.
  • the relay information includes identifiers of M relay devices measured by the first terminal device, where M is an integer greater than 0.
  • the first terminal device may first evaluate the measured M relay devices according to a preset rule.
  • the first terminal device determines one or more relay devices according to the distance or signal quality between the relay device and the first terminal device, and sends the first radio access network device an X determined by the first terminal device according to a preset rule
  • X is an integer greater than 0 and less than or equal to M.
  • the X relay devices included in the relay information are identifiers of relay devices whose distance to the first terminal device is less than a preset threshold or whose signal quality is greater than a preset threshold.
  • the relay device sends a discovery signal (discovery signal) on the side link, and the discovery signal includes one or more of a cell identifier and a base station identifier connected to the relay device.
  • the cell identity may be a physical cell identity (Physical Cell Identity, PCI), an evolved universal mobile communications system terrestrial wireless access network (Evolution Universal Mobile Telecommunications System Terrestrial Radio Access Network, E-UTRAN) cell global identity CGI), New Air Interface Community Global Identity (NR CGI), etc.
  • the base station identification may be a global base station identification (Global NB ID or Global eNB ID or Global ng-eNB ID), a global new air interface wireless access network node identification (Global NG-RAN Node ID), etc.
  • the first terminal device may determine the wireless access network device to which the relay device is connected according to the discovery signal sent by the relay device. Therefore, when the first terminal device reports the measurement report to the first radio access network device, in addition to the relay device identification, signal quality and / or signal power, it may also include the cell identification and base station identification of the relay device connection One or more of them.
  • the first wireless access network device receives the first information sent by the first terminal device.
  • the first wireless access network device determines the second terminal device that provides the relay service for the first terminal device in the target cell according to the first information.
  • the first radio access network device After receiving the first information and measurement report sent by the first terminal device, the first radio access network device decides to switch the first terminal device to the second radio access network device where the target cell is located, or to switch the target cell to the The second radio access network device is added as a secondary base station of the first terminal device.
  • the first radio access network device may determine that the signal quality from the first terminal device to the target cell is higher than the signal quality from the first terminal device to the source cell according to the A3 event or the A4 event, and the first terminal device needs to switch to the target Community.
  • the first radio access network device may determine, according to the A5 event, that the signal quality from the first terminal device to the target cell is higher than the first threshold, and the signal quality from the first terminal device to the source cell is lower than the second threshold, the first terminal device Need to connect to the target cell.
  • the source cell refers to a cell within the coverage of the radio access network device currently connected to the first terminal device
  • the target cell refers to a cell within the coverage of the radio access network device to which the first terminal device needs to be connected.
  • the act of switching to the target cell and adding the radio access network device where the target cell is located as a secondary base station is collectively referred to as connecting to the target cell.
  • the source cell is a cell within the coverage of the first radio access network device.
  • the first radio access network device determines that the first terminal device needs to be connected to a cell within the coverage of the second radio access network device, and the target cell is a cell within the coverage of the second radio access network device.
  • the target cell identity may be determined by the first wireless access network device and sent to the second wireless access network device, or may be determined by the second wireless access network device.
  • the target cell identity is determined by the first radio access network device.
  • the target cell identifier is carried when the first radio access network device sends a handover request (handover request) message to the second radio access network device.
  • the target cell identity is determined by the second radio access network device.
  • the first radio access network device sends the measurement report sent by the first terminal device or the measurement report related to the second radio access network device to the second radio access network device.
  • the second radio access network device selects a cell as the primary cell under the secondary base station according to the measurement report, that is, the target cell mentioned herein.
  • the second radio access network device may also select one or more cells as secondary cells under the secondary base station.
  • Another possible situation is that, according to the measurement report sent by the first terminal device, the first radio access network device selects an appropriate secondary cell set (Secondary Cell Group, SCG) and sends it to the second radio access network device.
  • SCG Secondary Cell Group
  • the second radio access network device selects a cell from the secondary cell set as the primary cell under the secondary base station, that is, the target cell mentioned herein.
  • the second radio access network device may also select one or more cells from the secondary cell set as secondary cells under the secondary base station.
  • the first information is used to indicate that the first terminal device is a terminal device with limited uplink power.
  • the first radio access network device may determine that the uplink signal sent by the first terminal device to the first radio access network device cannot be directly based on the first information
  • the relay device needs to forward the relay device before the first wireless access network device can receive the uplink signal sent by the first terminal device.
  • the first terminal device forwards the first information to the first wireless access network device through the second terminal device, and the first wireless access network device learns that the first terminal device needs to be forwarded by the relay device before transmitting the uplink signal to itself.
  • the first wireless access network device may According to the first information, it is determined that the terminal device that provides the relay service for the first terminal device in the target cell may be the second terminal device, which is understandable that the first radio access network device determines that the first terminal device and the second terminal The devices are connected together to the second radio access network device where the target cell is located.
  • the first wireless access network device may also receive indication information sent by the first terminal device, where the indication information is used to indicate that the second wireless access network device has not found a suitable relay device.
  • the first wireless access network device may also determine, according to the first information, that the terminal device that provides the relay service for the first terminal device in the target cell may be the second terminal device, which is understandable, that is, the first wireless access The network device determines to connect the first terminal device and the second terminal device together to the second wireless access network device where the target cell is located.
  • the first wireless access network device can confirm that there is a relay device connected to the second wireless access network device in the relay device corresponding to the received relay information, the measurement sent by the first terminal device When the cell ID and / or base station ID of the relay device is included in the report, the first wireless access network device can determine from this that the first terminal device may not be able to find a relay device connected to the second wireless access network device , The first wireless access network device determines to connect the first terminal device and the second terminal device together to the second wireless access network device where the target cell is located.
  • the first terminal device may not be able to determine whether the relay device and the second wireless access network device are connected, but the first wireless access network device and the second wireless access network device have previously interacted on the X2 interface or Xn interface for coverage
  • the list of relay devices in range contains the identification of each relay device on the side link.
  • the first wireless access network device may determine whether the relay device and the second wireless network device are connected according to the information of the relay device included in the measurement report sent by the first terminal device.
  • the first terminal device can find the relay device connected to the second wireless access network device, the first terminal device can use the relay device within the coverage of the second wireless access network device to provide the first terminal device with Following the service, this method is beyond the scope of this solution and will not be repeated here.
  • first information and measurement report received by the first wireless access network device and sent by the first terminal device are forwarded to the first wireless access network device through the second terminal device, and the specific forwarding process can refer to the traditional Technology, the embodiments of the present application will not repeat them here.
  • the relay communication method provided by the embodiment of the present application is directed to a one-way relay scenario, and the first terminal device may also receive a downlink signal sent by the first wireless access network device, and the downlink signal does not need to be forwarded by the relay device Therefore, the first radio access network device and the first terminal device may perform a handover process or a dual connectivity (Dual Connectivity, DC) secondary base station addition process according to the conventional technology, and the first terminal device switches or dual connects to the second radio connection The cells within the coverage area of the network access device continue to perform downlink communication.
  • DC Dual Connectivity
  • the first wireless access network device sends second information to the second wireless access network device.
  • the second information is used to indicate the second terminal device that provides the relay service for the first terminal device in the target cell.
  • the second information may include the identifier of the first terminal device and the identifier of the second terminal device.
  • the second information includes the identifier of the second terminal device.
  • the second information may include third information, and the third information is used to instruct the second terminal device to provide the relay service for the first terminal device in the target cell.
  • the second information may include an identifier of the second terminal device and third information. The third information is used to instruct the second terminal device to provide the relay service for the first terminal device in the target cell.
  • the first radio access network device may use the handover request message in the handover process to send the second information to the second radio access network device; it may also use the secondary base station addition request message (SeNB addition request or SgNB addition request). ) Send the second information to the second wireless access network device.
  • the specific form of the cell may be a relay ID (relay ID).
  • the relay ID may be an identifier of the second terminal device on the side link, or may be an identifier configured by the first wireless access network device for the second terminal device, such as C-RNTI or other unique identifiers for the second terminal The identification of the device.
  • two cells are added to the handover request message or the secondary base station addition request message, that is, second information, one is the UE ID, and the other is the relay ID.
  • the UE ID may be an identifier of the first terminal device on the side link, or may be an identifier configured by the first radio access network device for the first terminal device, such as C-RNTI or other unique identifiers for the first terminal device Logo. Relay ID explained above.
  • a new cell is added to the handover request message or the secondary base station add request message, that is, third information, for example, adding a relay binding (addrelaytogether), the cell may contain true (true) And false (false) two values. It may also be that the addrelaytogether cell has no value, as long as the addrelaytogether cell is included, it indicates that the second terminal device provides the relay service for the first terminal device in the target cell.
  • two new cells are added to the handover request message or the secondary base station addition request message, one is the relay ID, and the other is to add the relay binding.
  • a relay binding information element is added to instruct the relay ID to provide the relay service for the first terminal device in the target cell.
  • the secondary base station addition request message may further include a data sending request (data forwarding request) indication, and after receiving the data sending request indication, the second wireless access network device feeds back the data configured by the first terminal device to the first wireless access network device
  • User-level general packet radio service tunnel protocol general packet radio service tunneling protocol for the user
  • GTP-U general packet radio service tunneling protocol for the user plane
  • radio bearer data bearer, DRB
  • protocol data unit protocol data unit
  • the GTP-U tunnel information sent by the second radio access network device contains the DRB ID or PDU session ID, and the GTP-U tunnel address information, such as the IP address and tunnel endpoint information (Tunnel Endpoint IDentity, TEID).
  • the second radio access network device may also feed back the user plane GTP-U tunnel information of the DRB or PDU session granularity configured to the second terminal device to the first radio access network device for the first radio access network
  • the second wireless access network device receives the second information sent by the first wireless access network device.
  • the agreement provisions may refer to the rules agreed in advance that need to be jointly observed between the devices.
  • the second wireless access network device may determine the terminal that provides the relay service for the first terminal device in the target cell according to the second information.
  • the device is a second terminal device. If the second information includes the identifier of the first terminal device and the identifier of the second terminal device, the second wireless access network device may determine the first wireless access network device indication according to the identifier of the first terminal device and the identifier of the second terminal device.
  • the terminal device that provides the relay service for the first terminal device in the target cell is the second terminal device.
  • the second radio access network device may determine that the terminal device that provides the relay service for the first terminal device in the target cell is the second terminal device according to the third information, and the third information is used to indicate The second terminal device provides the relay service for the first terminal device in the target cell. If the second information includes the identifier of the second terminal device and the third information, the second radio access network device may determine the terminal device that provides the relay service for the first terminal device in the target cell according to the identifier of the second terminal device and the third information It is the second terminal device.
  • the first wireless access network device may receive uplink power according to the first terminal device.
  • the indication information of the limited terminal device determines that the first terminal device and the second terminal device are connected to the target cell together, and the second terminal device provides the first terminal device with the relay service in the target cell, thereby realizing that the remote device can still Uplink communication with the target wireless access network device through the relay device.
  • the embodiment of the present application further includes the following steps.
  • the second wireless access network device sends the fourth information and the fifth information to the first wireless access network device.
  • the fourth information includes the target cell identity and the first C-RNT allocated to the first terminal device.
  • the target cell identity may be determined by the first wireless access network device and sent to the second wireless access network device, or may be determined by the second wireless access network device.
  • the fourth information may also include a dedicated radio resource configuration (Radio, Resource, Dedicated) for the first terminal device.
  • the dedicated radio resource configuration includes a signaling radio bearer list, a data radio bearer list, and a media access control master configuration (MAC-Main Config) and physical proprietary configuration (Physical Config Dedicated), etc.
  • the fifth information includes the target cell identity, the second C-RNTI allocated for the second terminal device and the random access resource.
  • the target cell ID included in the fifth information is the same as the target cell ID included in the fourth information.
  • the random access resources include one of random access preamble index (ra-Preamble Index), random access mask index (ra-PRACH-Mask Index), radio resource common configuration (RadioResource) ConfigComm, etc. Or more.
  • Radio, Resource, and Comm mainly include random access public configuration, broadcast control channel public configuration, and paging control channel public configuration.
  • the fifth information may also include a radio resource specific configuration (Radio Resource Config Dedicated) for the second terminal device.
  • the radio resource specific configuration includes, in addition to the signaling radio bearer list configured for the second terminal device, the data radio bearer list, MAC-Main Config and Physical Config Dedicated, and so on.
  • the radio resource specific configuration may also include the first C-RNTI, and the mapping relationship between the signaling radio bearer of the second terminal device configured for the second terminal device and the signaling radio bearer of the first terminal device, or The mapping relationship between the data radio bearer of the second terminal device and the data radio bearer of the first terminal device configured by the second terminal device.
  • SRB1 of the second terminal device corresponds to SRB1 of the first terminal device
  • DRB1 of the second terminal device corresponds to DRB1 and DRB2 of the first terminal device
  • DRB2 of the second terminal device corresponds to DRB3 of the first terminal device.
  • the radio resource specific configuration includes the mapping relationship between the signaling radio bearer of the second terminal device and the side link logical channel of the first terminal device and the second terminal device, or the data radio bearer of the second terminal device and the first The mapping relationship between the side link logical channels of a terminal device and a second terminal device.
  • the radio resource specific configuration includes the mapping relationship between the signaling / data radio bearer of the second terminal device and the side link logical channel of the first terminal device and the second terminal device, and the information of the first terminal device. The mapping relationship between the command / data radio bearer.
  • the fourth information and the fifth information may be encapsulated in the same interface message sent by the second radio access network device to the first radio access network device, such as a handover request confirmation (handover request acknowledgement) message, or an auxiliary
  • the base station adds a request confirmation message (SeNB / SgNB addition request) message.
  • the handover request confirmation message or the secondary base station addition request confirmation message contains 2 cells, one cell contains the fourth information, and the other cell contains the fifth information.
  • the first wireless access network device needs to provide the fourth information and the fifth information Instructions.
  • a cell is defined as a transparent transmission container (Target / eNB / gNB to Source / eNB / gNBTransparent Container) from the target base station to the source base station, which contains the fourth information.
  • the other cell is defined as a transparent transmission container for the relay from the target base station to the source base station (Target eNB to Source eNB transparent Container for relay), which contains the fifth information.
  • the target base station to the source base station transparent transmission container list (Target eNB / gNB to Source eNB / gNB transparent Container List), the first cell appears therein contains the fourth information, the second cell contains the fifth information.
  • a cell is defined as a container (SeNB / SgNB to MeNB / MgNB Container) from the secondary base station to the primary base station, which contains the fourth information.
  • the other cell is defined as a container (SeNB / SgNB to MeNB / MgNB Container for relay) for the secondary base station to the primary base station, which contains the fifth information.
  • a container list (SeNB / SgNB to MeNB / MgNB Container List) that the secondary base station gives to the primary base station.
  • the first cell in it contains the fourth information
  • the second cell contains the fifth information.
  • the first wireless access network device receives the fourth information and the fifth information sent by the second wireless access network device.
  • the first wireless access network device sends fourth information to the first terminal device.
  • the first wireless access network device sends the fourth information to the first terminal device.
  • the second wireless access network device sends a handover command (Handover Command) message sent by the first wireless access network device, and the handover command message includes fourth information.
  • the handover command message may be a downlink dedicated There are control channel messages (DL-DCCH-Message).
  • the fourth information is sent to the first terminal device.
  • the SCG-Config message sent by the second radio access network device to the first radio access network device includes the fourth information, for example, the SCG-Config message may be scg-RadioConfig -r12. After receiving the first wireless access network, the fourth information is sent to the first terminal device.
  • the first terminal device receives the fourth information sent by the first wireless access network device.
  • the first terminal device After receiving the target cell identifier and the first C-RNTI, the first terminal device connects to the target cell and establishes a connection with the target cell to communicate. For the case that the first radio access network device does not include the identifier of the first terminal device in the second information, for example, the first terminal device sends an RRC connection request message through the second terminal device, which contains the first C-RNTI.
  • the second radio access network device receives the RRC connection request message forwarded by the second terminal device and obtains the first C-RNTI, it is learned that the first terminal device has been connected through the second terminal device. Subsequently, the second wireless network access device directly sends the downlink data to the first terminal.
  • the first radio access network device contains the identifier of the first terminal device in the second information
  • a method is the same as above, that is, the first radio access network device is identified according to the first C-RNTI carried in the RRC connection request message The first terminal device.
  • Another method is that, when forwarding the RRC connection request message sent by the first terminal device, the second terminal device adds an adaptation layer outside the RRC connection request message.
  • the adaptation layer contains the identity of the first terminal device (such as the first terminal) The identification of the device on the side link) and other information.
  • the second radio access network device obtains the identity of the first terminal device by reading the adaptation layer. By comparing the identifier of the first terminal device acquired by the adaptation layer with the identifier of the first terminal device included in the second message by the first wireless access network device, the second wireless access network device can confirm that the first terminal device has Connected through the second terminal device.
  • the first wireless access network device sends fifth information to the second terminal device.
  • the first radio access network device may directly send the fifth information to the second terminal device, or may include the fifth information in a radio resource control (radio resource control (RRC) reconfiguration message (for example, RRC Connection Reconfiguration or RRC Reconfiguration ),
  • RRC radio resource control
  • the fifth information is sent to the second terminal device.
  • the first radio access network device may include the fifth information to include downlink control information (downlink control information, DCI) or MAC control information element (Control Element, CE) or other protocol layers, and send the fifth information to the second terminal device information.
  • RRC radio resource control
  • DCI downlink control information
  • CE MAC control information element
  • the second terminal device receives the fifth information sent by the first wireless access network device.
  • the second terminal device may determine that the terminal device that provides the relay service for the first terminal device in the target cell is the second terminal device according to the protocol.
  • the terminal device is connected to the target cell, and establishes a connection with the target cell to provide a relay service for the first terminal device.
  • the second terminal device initiates random access to the target cell of the second radio access network device according to the random access resource included in the fifth information.
  • the fifth information may further include indication information that explicitly instructs the second terminal device to provide the relay service for the first terminal device in the target cell.
  • the second wireless access network The device may determine that the second terminal device has accessed according to the preamble sent by the second terminal, or according to the second terminal device sending the preamble in a specific time-frequency resource.
  • the first radio access network device includes the identifier of the second terminal in the second information, for example, the second terminal device carries the first radio access network device included in the second message in the RRC connection establishment request message.
  • the identifier of the second terminal device for example, the identifier of the second terminal device on the side link, and the second wireless access network device can determine that the second terminal device has accessed by reading the identifier of the second terminal device in the RRC connection establishment request message .
  • the order of the steps of the relay communication method provided in the embodiments of the present application can be adjusted appropriately, and the steps can be increased or decreased according to the situation.
  • the order between S403 and S405 can be interchanged. That is, the first wireless access network device may first send the fifth information to the second terminal device, and then send the fourth information to the first terminal device, and the second terminal device receives the fifth information sent by the first wireless access network device. A terminal device receives the fourth information sent by the first wireless access network device.
  • the first radio access network device may not be necessary for the first radio access network device to determine the second terminal device that provides the relay service for the first terminal device in the target cell according to the first information, that is, without performing S303,
  • the first terminal device may send indication information to the first wireless access network device to indicate the second terminal device that provides the relay service for the first terminal device in the target cell.
  • the embodiment of the present application may further include the following steps.
  • the first terminal device determines the sixth information according to the first information.
  • the sixth information is used to indicate the second terminal device that provides the relay service for the first terminal device in the target cell.
  • the sixth information may include the identifier of the second terminal device or the second terminal device as the first terminal in the target cell.
  • the first terminal device sends sixth information to the first wireless access network device.
  • the first terminal device may include the sixth information in the RRC message, and forward the sixth information to the first radio access network device through the second terminal device.
  • the first terminal device may include the sixth information in the header of the protocol layer between the first terminal device and the second terminal device, such as the RLC layer, MAC layer, PHY layer, or newly added adaptation layer of the PC5 port.
  • the second terminal device adds the sixth information in the Uu protocol layer between the second terminal device and the first wireless access network device, and may also carry the identifier of the first terminal device, so that the first wireless device The access network device determines which terminal device sends the sixth information.
  • the first radio access network device determines that the second terminal device provides the first terminal device with a relay service in the target cell.
  • the first radio access network device directly determines the identifier of the second terminal device.
  • the sixth information includes the indication information that the second terminal device provides the relay service for the first terminal device in the target cell
  • the first wireless access network device according to the second terminal device that helps the first terminal device to forward the sixth information Determine the identification of the second terminal device.
  • the first radio access network device determines that the second terminal device is in the target cell Provide relay services for the first terminal device.
  • the first wireless access network device receives the sixth information sent by the first terminal device. Perform S304 and subsequent steps.
  • the first terminal device may send the seventh information and the target cell identifier to the second terminal device.
  • the seventh information is used to indicate that the first terminal device is about to switch or connect to the target cell, and requests the second terminal device to also switch or dual-connect to the target cell.
  • the first terminal device may acquire the target cell identity according to the handover command of the first radio access network device, or may select the target cell identity by itself through the measurement report.
  • the second terminal device After receiving the seventh information and the target cell identifier sent by the first terminal device, the second terminal device sends the eighth information and the target cell identifier to the first radio access network device, where the eighth information is used to request handover or dual connection to the target Community.
  • the first radio access network device After receiving the eighth information and the target cell identifier sent by the second terminal device, the first radio access network device sends a dual connection or handover configuration message to the second terminal device.
  • the handover configuration message may include confirmation information used for the first radio access network device to agree that the second terminal device continues to provide services for the first terminal device in the target cell.
  • the first radio access network device configures a dual connection for the second terminal device, configures the second radio access network device as a secondary base station, and the DRB forwarded for the first terminal device is a secondary cell set bearer (SCGbearer) type .
  • SCGbearer secondary cell set bearer
  • the second terminal device side has only the RLC layer, MAC layer, PHY layer, and adaptation layer.
  • the terminal device and the secondary base station should be a complete PDCP layer, RLC layer, MAC layer, and PHY layer.
  • the PDCP-Config which is the PDCP layer configuration, is not included in the data radio bearer list.
  • the downlink between the first terminal device and the radio access network device can be performed Handover, and the first terminal device or the first radio access network device determines whether the uplink from the first terminal device to the first radio access network device is reserved. For example, the downlink of the first terminal device is switched or transferred to the second radio access network device, but the uplink still retains the connection with the first radio access network device. This is referred to here as the downlink and uplink separation between the first terminal device and the radio access network device.
  • the downlink between the first terminal device and the radio access network device Roads and uplinks are scenarios that are not separate. As shown in FIG. 6, the method may include the following detailed steps.
  • the first terminal device sends the first information to the first wireless access network device.
  • the first wireless access network device receives the first information sent by the first terminal device.
  • the first wireless access network device determines whether the uplink from the first terminal device to the first wireless access network device is reserved according to the first information.
  • the first radio access network device After the first radio access network device receives the first information and the measurement report sent by the first terminal device, the first radio access network device may report the cell information included in the measurement report to determine the target cell.
  • the first radio access network device may report the cell information included in the measurement report to determine the target cell.
  • the first information is used to indicate that the first terminal device is a terminal device with limited uplink power.
  • the first radio access network device may determine that the uplink signal sent by the first terminal device to the first radio access network device cannot be directly based on the first information
  • the relay device needs to forward the relay device before the first wireless access network device can receive the uplink signal sent by the first terminal device.
  • the first terminal device forwards the first information to the first wireless access network device through the second terminal device, and the first wireless access network device learns that the first terminal device needs to be forwarded by the relay device before sending the uplink signal to itself.
  • the first radio access network device may determine whether the uplink from the first terminal device to the first radio access network device is reserved based on the first information. It can be understood that, when the first wireless access network device receives the measurement report that does not include relay information, the first wireless access network device may determine the first terminal device to the first wireless access network device according to the first information The uplink is reserved. For example, the first wireless access network device determines that the second terminal device provides a relay service for the first terminal device within the coverage of the first wireless access network device, that is, the first terminal device to the first wireless access network device Uplink reservation.
  • the first wireless access network device may determine the uplink reservation from the first terminal device to the first wireless access network device according to the first information.
  • the first wireless access network device may According to the first information, it is determined that the uplink from the first terminal device to the first wireless access network device is not reserved, that is, it can be determined that the first terminal device can use the relay device within the coverage of the second wireless access network device to connect to A second wireless access network device, where the relay device provides a relay service for the first terminal device. Understandably, the first terminal device may establish an uplink through the relay device and the second radio access network device.
  • the relay device within the coverage of the second wireless access network device may be the terminal device closest to the first terminal device or the second wireless access network device, or the first terminal device
  • the terminal device with the highest signal quality or the signal quality with the highest signal distance from the second radio access network device is not limited in this embodiment of the present application.
  • the first radio access network device determines whether the uplink from the first terminal device to the first radio access network device is reserved according to the first information, the first radio access network device needs to instruct the second radio access network device not to The first terminal device needs to be allocated random access resources in the target cell.
  • an implicit indication mode or display mode may be used to notify the second wireless access network device. For example, after S603, S604a or S604b may be performed.
  • the first radio access network device may inform the second radio access network device in an explicit indication manner that the first terminal device does not need to allocate random access resources in the target cell.
  • the embodiments of the present application may include the following steps.
  • the first wireless access network device sends second information to the second wireless access network device.
  • the second information is used to indicate that the second radio access network device does not need to allocate random access resources for the first terminal device in the target cell.
  • the second wireless access network device receives second information sent by the first wireless access network device.
  • the first radio access network device may inform the second radio access network device in an implicit indication that the first terminal device does not need to allocate random access resources in the target cell.
  • the embodiments of the present application may include the following steps.
  • the first wireless access network device sends the first information to the second wireless access network device.
  • the second wireless access network device receives the first information sent by the first wireless access network device.
  • the second wireless access network device may determine that the second wireless access network device does not need to allocate random access for the first terminal device in the target cell Resources.
  • the first radio access network device may also send the target cell identification and the first terminal device identification to the second radio access network device. For example, after S604a or S604b, S606 and S607 may be performed.
  • the first wireless access network device sends the identifier of the first terminal device to the second wireless access network device. It should be noted that S606 may be performed together with S604a or S604b, that is, the first wireless access network device sends the second information and the identifier of the first terminal device, or the first wireless access network device sends the first information and the first terminal The identification of the device.
  • the second wireless access network device receives the identifier of the first terminal device sent by the first wireless access network device.
  • the first wireless access network device may use the handover request message in the handover process to send the identifier of the first terminal device and the first information or the second information to the second wireless access network device;
  • the base station addition request message (SeNB / SgNB addition request) sends the identifier of the first terminal device and the first information or the second information to the second radio access network device.
  • This application does not limit this.
  • the first wireless access network device may also determine the target cell identity and send it to the second wireless access network device, or it may be determined by the second wireless access network device. For details, please refer to S303, which will not be repeated here.
  • the first wireless access network device may receive uplink power according to the first terminal device.
  • the indication information of the limited terminal device determines whether the uplink from the first terminal device to the first radio access network device is reserved, for example, the first terminal device can maintain the uplink with the first radio access network device through the second terminal device Connection, the first radio access network device transmits the uplink data of the first terminal device to the second radio access network device. Therefore, the remote device can still perform uplink communication with the target wireless access network device through the relay device.
  • the second radio access network device After the second radio access network device receives the identifier of the first terminal device, the target cell identifier, the first information or the second information sent by the first radio access network device, that is, S605a, S605b, or S607, it may be executed S701 to S704, as shown in FIG. 7, for specific detailed explanations, reference may be made to the explanations of S401 to S404, and the embodiments of the present application will not be repeated here.
  • the first radio access network device may not be necessary for the first radio access network device to determine whether the uplink from the first terminal device to the first radio access network device is reserved according to the first information, that is, without performing S603
  • the first terminal device may send indication information to the first wireless access network device to instruct the first terminal device to connect to the first wireless device Whether the uplink of the access network device is reserved.
  • the embodiment of the present application may further include the following steps.
  • the first terminal device determines third information according to the first information.
  • the third information is used to indicate whether the uplink requesting the first terminal device to the first radio access network device is reserved. For example, the first terminal device determines that it is a device with limited uplink power according to the first information. Then, if the first terminal device determines that no relay device connected to the second wireless access network device is found according to the measurement result, it determines that the uplink to the first wireless access network device is reserved. If the first terminal device determines that the first terminal device sends a relay device connected to the second wireless access network device according to the measurement result, it may determine that the uplink to the first wireless access network device is not retained, that is, the first A terminal device may establish an uplink through the relay device and the second radio access network device.
  • the third information may be an UL Maintained (ULMaintained) cell, which contains two values of true and false. It may also be that when the third information ULMaintained is included, it means that the uplink from the first terminal device to the first radio access network device is reserved, and if it does not contain ULMaintained, it means that the uplink from the first terminal device to the first radio access network device Road is not reserved.
  • ULMaintained UL Maintained
  • the first terminal device sends third information to the first wireless access network device.
  • the first terminal device may include the third information in the RRC message, and forward the third information to the first radio access network device through the second terminal device.
  • the first terminal device may include the third information in the header of the protocol layer between the first terminal device and the second terminal device, such as the RLC layer, MAC layer, PHY layer, or newly added adaptation layer of the PC5 port.
  • the second terminal device adds the third information in the Uu protocol layer between the second terminal device and the first wireless access network device, and may also carry the identifier of the first terminal device, so that the first wireless device The access network device determines which terminal device sends the third information.
  • the first wireless access network device receives the third information sent by the first terminal device. Perform S604a or S604b and subsequent steps.
  • the physical uplink control channel (Physical Uplink Control Channel, PUCCH) contains scheduling request (scheduling request (SR)), hybrid automatic retransmission confirmation (hybird automatic repeat request (HARQ) ACK), HARQ negative determination (non-acknowledgement , NACK) and channel status indicator (channel status indicator, CSI).
  • SR is to request uplink resources from the first radio access network device.
  • HARQ ACK or HARQ NACK is for downlink feedback.
  • the first radio access network device needs to feed back to the second radio access network device.
  • the first terminal device feeds back the HARQ ACK or HARQ NACK to the first radio access network device, it needs to add some information, for example, HARQ process ID, redundancy version (redundancy version, RV) ) Version etc.
  • the first radio access network device feeds back the identifier of the first terminal device, HARQ ACK or HARQ NACK, HARQ process identifier, RV version, etc. to the second radio access network device.
  • the first terminal device may also send indication information and the identifier of the first terminal device to the first wireless access network device, where the indication information is used for
  • a terminal device is a terminal device that needs to forward upstream data through a relay device and directly receive downstream data.
  • the first wireless access network device receives the indication information and the identification of the first terminal device sent by the first terminal device, and sends the indication information and the identification of the first terminal device to the second wireless access network device.
  • the second wireless access network device After receiving the indication information sent by the first wireless access network device and the identifier of the first terminal device, sends the first wireless access network device a center within the coverage of the second wireless access network device Following the identification of the device.
  • the first wireless access network device After receiving the identifier of the relay device within the coverage of the second wireless access network device sent by the second wireless access network device, the first wireless access network device forwards it to the first terminal device through the second terminal device.
  • the first terminal device may determine by searching that a relay device is providing the first terminal device within the coverage of the second wireless access network device Following the service. However, there are also relay devices whose first terminal device has not determined that it can provide relay services for the first terminal device. Subsequently, if the first terminal device still cannot search for the relay device provided by the second radio access network device, the first terminal device may refer to the above-mentioned first implementable mode or second implementable mode to determine the relay communication. the way. If the first terminal device can search for the relay device provided by the second wireless access network device, the uplink of the first terminal device can be forwarded through the second terminal device to establish an RRC connection with the second wireless access network device.
  • the first terminal device, the second terminal device, and the first wireless access network device may be established as shown in FIG. 9
  • the user terminal protocol stack of the first terminal device may include a packet data convergence protocol (packet data convergence protocol, PDCP) layer, an RLC layer, a MAC layer, and a PHY layer.
  • the second terminal device may include RLC layer 1, MAC layer 1 and PHY layer 1, and may also include RLC layer 2, MAC layer 2 and PHY layer 2.
  • the first radio access network device may include a PDCP layer, an RLC layer, a MAC layer, and a PHY layer.
  • the PDCP layer of the first terminal device and the PDCP layer of the first wireless access network device are peer-to-peer, and a wireless communication interface technology between the first terminal device and the first wireless access network device is used, such as LTE air interface or NR Air interface technology.
  • the RLC layer, MAC layer, PHY layer of the first terminal device are equivalent to the RLC layer 1, MAC layer 1, and PHY1 layer of the second terminal device.
  • the wireless communication between the first terminal device and the second terminal device is adopted between these protocol layers.
  • Communication interface technology such as PC5 port or air interface technology of side link.
  • the RLC layer 2, MAC layer 2, PHY layer 2 of the second terminal device and the RLC layer, MAC layer, and PHY layer of the first radio access network device are equivalent, and the second terminal device and the first wireless device are used between these protocol layers Wireless communication interface technology between access network devices.
  • the second terminal device and the first radio access network device may also include an adaptation layer (adapation).
  • the adaptation layer may be a protocol layer newly added in the embodiment of the present application.
  • the adaptation layer in the second terminal device is equivalent to the adaptation layer in the first radio access network device, and the wireless communication interface technology between the second terminal device and the first radio access network device is adopted between the two.
  • PDCP layer mainly processes RRC messages from the control plane and IP packets from the data plane. Its functions include: header compression and decompression, encryption / decryption, integrity protection, transmission of user data and control plane data, reordering and Retransmission processing, etc.
  • the adaptation layer mainly responsible for carrying the identifier of the first terminal device, the logical channel identifier of the first terminal device and the second terminal device on the side link, or the signaling radio bearer or data radio bearer identifier of the first terminal device.
  • RLC layer mainly responsible for segmentation / concatenation and reorganization of RLC service data unit (SDU), error correction through automatic repeat request (ARQ), and RLC protocol data unit (protocol data unit) , PDU) reordering, duplicate packet detection, RLC PDU re-segmentation, etc.
  • SDU service data unit
  • ARQ automatic repeat request
  • RLC protocol data unit protocol data unit
  • MAC layer Mainly responsible for matching logical channels and transport channels, multiplexing multiple MACs belonging to one or different logical channels to the same MAC PDU, and sending them to the PHY layer, through HARQ to perform error correction, scheduling processing, Logical channel priority processing, scheduling information reporting, random access process processing, etc.
  • PHY layer It provides mechanical, electronic, functional and standardized characteristics for the creation, maintenance and dismantling of physical links required for data transmission. Simply put, the PHY layer ensures that the original data can be transmitted on various physical media.
  • the first terminal device may further include an application layer, where the first data is generated, and the first data may include a data packet header and a payload.
  • the first terminal device may process the first data through the PDCP layer, RLC layer, MAC layer, and PHY layer of the first terminal device, and then send it to the second terminal device through the first channel between the first terminal device and the second terminal device .
  • the first channel may include one or more logical channels (LCH). Each logical channel corresponds to an identity (ID).
  • ID The logical channel ID (logic ID) can be used to identify the logical channel.
  • the logical channel ID can be the index number of the logical channel.
  • the identifiers corresponding to these 5 LCs may be LCID1, LCID2, LCID3, LCID4, and LCID5.
  • the RLC layer, MAC layer, and PHY layer protocols of the first terminal device may be specified by the wireless communication interface protocol between the first terminal device and the second terminal device.
  • the first data processed by the PDCP layer may be called PDCP protocol data unit (PDU)
  • the first data processed by the RLC layer may be called RLC PDU
  • the data processed by the MAC layer may be called MAC PDU.
  • the payload included in the first data after being processed by different protocol layers remains unchanged, and the information included in the data packet header after passing through different protocol layers may be different.
  • the PDCP sequence number may be included in the data packet header; subsequently, after the first data is processed by the MAC layer, the data packet header may include the LCID and source address in addition to the PDCP sequence number address) field and destination address (target), etc.
  • the source address field may include the identification of the first terminal device
  • the destination address field may include the identification of the second terminal device.
  • the LCID included in the data packet header of the first data may be used to identify the logical channel that transmits the first data.
  • the identification of the first terminal device may be used to identify the first terminal device, and the identification of the second terminal device may be used to identify the second terminal device.
  • the identifier of the first terminal device may be the identifier of the first terminal device on the first channel, for example, the identifier of the first terminal device on the PC5 port or side link.
  • the identifier of the second terminal device may be the identifier of the second terminal device on the first channel, for example, the identifier of the second terminal device on the PC5 port or side link.
  • the PHY layer, MAC layer, and RLC layer equivalent to the first terminal device in the second terminal device may be as shown in FIG. 9, and are the end pair of the PHY layer, MAC layer, and RLC layer in the second terminal device and the first terminal device PHY layer 1, MAC layer 1, RLC layer 1 connected at the end.
  • the process of processing the first data through the PHY, MAC layer, and RLC layer of the second terminal device that is equivalent to the first terminal device can refer to the prior art, and details are not described in this embodiment of the present application.
  • the second terminal device may use the direct connection between the second terminal device and other relay devices (such as a third terminal device).
  • the connection channel sends the second data to other relay devices, and the other relay devices send the second data to the first wireless access network device.
  • the second channel is a wireless communication interface between the second terminal device and the wireless access network device.
  • the second channel may be an LTE air interface (LTE air interface for short), such as a Uu interface or an NR air interface (NR air interface for short) ), Such as: Nu mouth and so on.
  • the second terminal device may transmit the second data through the second channel established with the first wireless access network device.
  • the second terminal device sends the second data to the first wireless access network device through a data radio bearer (DRB) between the second terminal device and the first wireless access network device.
  • DRB data radio bearer
  • the second terminal device may process the second data through the RLC layer, MAC layer, and PHY layer in the second terminal device that are equivalent to the first wireless access network device, and then access the first wireless device through the second terminal device
  • a data radio bearer (DRB) between network devices sends second data to the first wireless access network device.
  • the RLC layer, MAC layer, and PHY layer in the second terminal device that are equivalent to the first wireless access network device may be as shown in FIG. 9 for the second terminal device and the first wireless access network device.
  • PHY layer, MAC layer, and RLC layer are connected PHY layer 2, MAC layer 2, and RLC layer 2 end-to-end.
  • the second terminal device processes the second data through the RLC layer, MAC layer, and PHY layer of the second terminal device that are equivalent to the first wireless access network device, and then passes the second terminal device and A signalling radio bearer (SRB) between radio access network devices sends second data to the first radio access network device.
  • SRB signalling radio bearer
  • a new protocol layer (or called adaptation layer) can also be added to the first terminal device.
  • the newly added protocol layer is mainly responsible for the first radio access network
  • the device determines which DRB of which terminal device receives the arriving data. For example, multiple DRBs of the first terminal device may be transmitted through one DRB of one second terminal device, or multiple DRBs of multiple first terminal devices may be transmitted through one DRB of one second terminal device.
  • the identifier of the first terminal device and the DRB identifier may be included in the second data when the data packet header and payload are processed by the newly added protocol layer, for example, included in the adaptation layer packet header.
  • the identification of the first terminal device and the identification of the logical channels of the first terminal device and the second terminal device may be included in the second data when the packet header and payload are processed by the newly added protocol layer, for example, included in the adaptation layer Baotou.
  • the identification of the logical channel of the second terminal device may refer to the identification of the logical channel of the second terminal device on the side link.
  • the newly added protocol layer may be deployed between the PDCP layer and the RLC layer, or between the RLC layer and the MAC, without limitation.
  • the second data may further include a newly added protocol layer indication
  • the newly added protocol layer indication may include
  • the RLC PDU or the MAC PDU or the PHY PDU for example, the RLC packet header, the MAC packet header, or the PHY layer packet header includes a newly added protocol layer indication to indicate that there is a newly added protocol layer, so that the first wireless access network device adds
  • the protocol layer instructs to determine to hand over the received second data to the newly added protocol layer of the first radio access network device for processing.
  • the newly added protocol layer of the second terminal device is equivalent to the newly added protocol layer of the first wireless access network device (that is, has a corresponding relationship).
  • the first wireless access network device may receive the second data sent by the second terminal device through the DRB, then after receiving the second data, the first wireless access network device may pass the received second data through the first wireless access
  • the PHY layer, MAC layer, RLC layer, and adaptation layer of the network device process to obtain the first terminal device ID and DRB ID, and determine that the received data is the first terminal device DRB according to the first terminal device ID and DRB ID
  • the sent data is sent to the PDCP layer corresponding to the DRB of the first radio access network device side and the first terminal device for processing to obtain a load.
  • the first wireless access network device obtains the identifier of the first terminal device and the identifiers of the logical channels of the first terminal device and the second terminal device, and then stores the logical channel of the first terminal device and the second terminal device according to their own Mapping relationship between the ID and the DRB ID of the first terminal device, find the corresponding DRB ID of the first terminal device, and send the data to the PDCP layer corresponding to the DRB of the first wireless access network device side and the first terminal device Process and get the load.
  • sending the load to the PDCP layer of the first radio access network device for processing may refer to the prior art and will not be described in detail.
  • the first terminal device device or the first wireless access network device determines that the second terminal device device provides the relay service for the first terminal device device in the target cell, or the first terminal device may determine the second wireless access network device The relay device within the coverage provides the relay service for the first terminal device device.
  • the first terminal device device may refer to the protocol stack shown in FIG. 9 to transmit uplink data with the second radio access network device according to the prior art.
  • the first terminal device device may refer to the protocol stack shown in FIG. 10 to transmit uplink data with the second radio access network device.
  • the adaptation layer, RLC layer, MAC layer, and PHY layer in the second terminal device that are equivalent to the first wireless access network device may be as shown in FIG. 10 for the second terminal device and the first wireless access network device.
  • the PDCP layer of the first terminal device corresponds to the PDCP layer of the second radio access network device, and uses a wireless communication interface technology between the first terminal device and the second radio access network device, such as an LTE air interface or NR air interface technology.
  • the first wireless access network device receives the second data forwarded by the second terminal device, and obtains the identifier of the first terminal device and the DRB identifier or the identifiers of the logical channels of the first terminal device and the second terminal device after being processed by the adaptation layer. It is assumed that the first radio access network device and the second radio access network device have previously established a corresponding GTP-U tunnel for each DRB of the first terminal.
  • the first wireless access network device will acquire the identity of the first terminal device (such as the identity of the first terminal device on the side link, or the first wireless access network device assigns the first terminal device (Such as C-RNTI, or local ID local ID, etc.), and the logical channel identification of the first terminal device and the second terminal device on the side link, and the load obtained by the first terminal device obtained at the same time is obtained through the first wireless connection
  • the interface between the network access device and the second wireless access network device is sent to the second wireless access network device.
  • the first wireless access network device is based on the identifier of the first terminal device, the logical channel identifier of the first terminal device and the second terminal device on the side link, and the first terminal device and the second terminal device saved by themselves are on the side
  • the mapping relationship between the logical channel identifier of the link and the data radio bearer DRB of the first terminal determines the DRB identifier of the first terminal device corresponding to the load.
  • the first wireless access network device obtains the identifier of the first terminal device and the identifier of the data radio bearer of the first terminal device from the adaptation layer header after processing, thereby determining the DRB identifier of the first terminal device corresponding to the load .
  • the first wireless access network device encapsulates the payload into third data and sends it to the second wireless access network device through the user plane GTP-U tunnel of the X2 interface or Xn interface corresponding to the DRB of the first terminal device.
  • the first radio access network device may further include an L1 layer, an L2 layer, and a user datagram protocol (user datagram protocol, UDP) / IP layer.
  • the second radio access network device may include an L1 layer, an L2 layer, and a UDP / IP layer.
  • the L1 layer includes the PHY layer
  • the L2 layer includes the MAC layer.
  • the L1 layer of the first radio access network device and the L1 layer of the second radio access network device are equivalent, and the two are used between the first radio access network device and the second radio access network device.
  • Wireless communication interface technology such as wired interface technology.
  • the L2 layer, UDP / IP layer of the first radio access network device and the L2 layer and UDP / IP layer of the second radio access network device are equivalent, and the first radio access network device and the second Wired communication interface technology between wireless access network equipment.
  • the first radio access network device and the second radio access network device may also include a GTP-U tunnel.
  • the GTP-U tunnel is used for the first wireless access network device to transmit the third data to the second wireless access network device.
  • the GTP-U tunnel endpoint identifier of the first wireless access network device and the GTP-U tunnel endpoint identifier of the second wireless access network device are added, and the third data includes the first wireless The GTP-U tunnel endpoint identifier of the access network device and / or the GTP-U tunnel endpoint identifier of the second wireless access network device.
  • the second wireless access network device After the second wireless access network device receives the third data, it can process the received third data through the L1 layer, L2 layer, UDP / IP, GTP-U layer of the second wireless access network device, and the second wireless The access network device determines the first terminal device identifier and the DRB identifier according to the GTP-U tunnel endpoint identifier and the mapping relationship between the GTP-U tunnel endpoint identifier and the first terminal device and DRB. Since the PDCP layer includes multiple PDCP entities, each PDCP entity corresponds to a DRB or logical channel, so that the second radio access network device can send data to the first radio access network device side and the DRB correspondence of the first terminal device The PDCP layer is processed to get the load. Exemplarily, in the embodiments of the present application, sending the load to the PDCP layer of the first radio access network device for processing may refer to the prior art and will not be described in detail.
  • the adaptation layer may also be deployed on the second terminal device and the second radio access network device, respectively.
  • the second wireless access network device may process the received second data through the L1 layer, L2 layer, UDP / IP, GTP-U layer of the second wireless access network device, and obtain The peer-to-peer adaptation layer header of the second terminal device and the first payload equivalent to the first terminal device, the adaptation layer header includes the identifier of the first terminal device and the peer of the first terminal device and the second radio access network device.
  • the ID of the data radio bearer, or the adaptation layer header includes the ID of the first terminal device and the ID of the logical channel between the first terminal device and the second terminal device.
  • the second radio access network device may be based on the identity of the first terminal device and the first terminal device and the second radio access network device.
  • the identifier of the peer data radio bearer determines the PDCP layer entity corresponding to the data radio bearer identifier of the first terminal device on the second radio access network device, or, based on the identifier of the first terminal device and the first terminal device and the first terminal device and the first
  • the identifier of the logical channel of the second terminal device determines the PDCP layer entity corresponding to the logical channel identifier of the first terminal device on the second radio access network device.
  • sending data to the PDCP layer of the second radio access network device for processing may refer to the prior art, and will not be described in detail.
  • the first wireless access network device and the second wireless access network device when establishing the X2 or Xn interface, may establish a GTP-U tunnel dedicated to forwarding user data for the user.
  • the first wireless access network device The X2 / Xn setup request message provides the GTP-U tunnel endpoint identification on the first radio access network device side, and the second radio access network device provides the GTP on the second radio access network device side in the X2 / Xn setup response message -U tunnel endpoint identification.
  • the GTP-U tunnel established at this time is the granularity of the wireless access network equipment. If the first radio access network device and the second radio access network respectively provide the GTP-U tunnel endpoint identification, the cell identification is also provided.
  • the GTP-U tunnel established at this time is of cell granularity. If the first radio access network device sends the handover request or the secondary base station add request message to the second radio access network device, the GTP-U tunnel endpoint identifier is provided. The second radio access network device provides the GTP-U tunnel endpoint identifier when replying to the second radio access network device with the handover request confirmation or the secondary base station addition request confirmation message. The GTP-U tunnel established at this time is of UE granularity.
  • the method provided by the embodiments of the present application is introduced from the perspective of interaction between network access devices. It can be understood that, for each network element, such as the first terminal device, the first wireless access network device, and the second wireless access network device, in order to implement the functions in the method provided in the embodiments of the present application, the first terminal device, The first radio access network device and the second radio access network device include hardware structures and / or software modules corresponding to performing various functions.
  • the first terminal device and the first radio access network device may be divided into function modules according to the above method examples.
  • each function module may be divided corresponding to each function, or two or more functions may be divided.
  • the above integrated modules may be implemented in the form of hardware or software function modules. It should be noted that the division of the modules in the embodiments of the present application is schematic, and is only a division of logical functions. In actual implementation, there may be another division manner.
  • FIG. 12 shows a schematic diagram of a possible composition of the relay communication device mentioned above and in the embodiment, and the relay communication device can execute each method embodiment of the present application. Steps performed by the first radio access network device and the first terminal device in any method embodiment.
  • the relay communication device is a first wireless access network device or a communication device that supports the first wireless access network device to implement the method provided in the embodiment, for example, the communication device may be a chip system. As shown in FIG. 12, the relay communication device may include a receiving unit 1201, a sending unit 1202, and a processing unit 1203.
  • the receiving unit 1201 is used to support the relay communication device to execute the method described in the embodiments of the present application.
  • the receiving unit 1201 is used to execute or support the relay communication device to execute S302 in the parameter configuration method shown in FIG. 3, S302 and S402 in the parameter configuration method shown in FIG. 4, and the parameters shown in FIG. 5.
  • S302, S402, and S503 in the configuration method S602 in the parameter configuration method shown in FIG. 6, S602 and S702 in the parameter configuration method shown in FIG. 7, and S602, S702 and S602 in the parameter configuration method shown in FIG. 8. S803.
  • the relay communication device may further include: a processing unit 1203.
  • the processing unit 1203 is configured to execute or support the relay communication device to execute S303 in the parameter configuration method shown in FIG. 3, S303 in the parameter configuration method shown in FIG. 4, and in the parameter configuration method shown in FIG. S603, S603 in the parameter configuration method shown in FIG. 7.
  • the relay communication device is a first terminal device or a communication device that supports the first terminal device to implement the method provided in the embodiment, for example, the communication device may be a chip system.
  • the sending unit 1202 is used to support the relay communication device to execute the method described in the embodiments of the present application.
  • the sending unit 1202 is used to execute or support the relay communication device to execute S301 in the parameter configuration method shown in FIG. 3, S301 in the parameter configuration method shown in FIG. 4, and the parameter configuration method shown in FIG. S301 and S502 in FIG. 6, S601 in the parameter configuration method shown in FIG. 6, S601 in the parameter configuration method shown in FIG. 7, and S601 and S802 in the parameter configuration method shown in FIG. 8.
  • the processing unit 1203 is configured to execute or support the relay communication device to execute S501 in the parameter configuration method shown in FIG. 5 and S801 in the parameter configuration method shown in FIG. 8.
  • the receiving unit 1201 is configured to execute or support the relay communication device to execute S404 in the parameter configuration method shown in FIG. 4, S404 in the parameter configuration method shown in FIG. 5, and S704, S704 in the parameter configuration method shown in FIG. 8.
  • the relay communication device provided by the embodiment of the present application is used to execute the method of any of the above embodiments, and therefore can achieve the same effect as the method of the above embodiment.
  • the communication device 1300 may be a first wireless access network device, or may be a device in the first wireless access network device.
  • the communication device 1300 may be a chip system. In the embodiment of the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices. Alternatively, the communication device 1300 is used to implement the function of the first terminal device in the above method.
  • the communication device 1300 may be a first terminal device or a device in the first terminal device.
  • the communication device 1300 may be a chip system. In the embodiment of the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices.
  • the communication device 1300 includes at least one processor 1301, configured to implement the functions of the first radio access network device or the first terminal device in the method provided in the embodiments of the present application.
  • the processor 1301 may be used to determine the second terminal device that provides the relay service for the first terminal device in the target cell according to the first information or based on the first information Whether the uplink from the first terminal device to the first radio access network device is reserved.
  • the processor 1301 may be used to determine the second information according to the first information, and the second information is used to indicate the second terminal device or the second terminal device that provides the relay service for the first terminal device in the target cell
  • the information is used to indicate whether the uplink from the first terminal device to the first radio access network device is reserved, etc.
  • the communication device 1300 may further include at least one memory 1302 for storing program instructions and / or data.
  • the memory 1302 and the processor 1301 are coupled.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information interaction between devices, units or modules.
  • the processor 1301 may cooperate with the memory 1302.
  • the processor 1301 may execute program instructions stored in the memory 1302. At least one of the at least one memory may be included in the processor.
  • the communication device 1300 may further include a communication interface 1303 for communicating with other devices through a transmission medium, so that the device used in the communication device 1300 can communicate with other devices.
  • a communication interface 1303 for communicating with other devices through a transmission medium, so that the device used in the communication device 1300 can communicate with other devices.
  • the communication device is a network device
  • the other device is a terminal device.
  • the communication device is a terminal device
  • the other device is a network device.
  • the processor 1301 uses the communication interface 1303 to send and receive data, and is used to implement the method performed by the first wireless access network device or the first terminal device described in the embodiments corresponding to FIG. 3 to FIG. 8.
  • the embodiments of the present application do not limit the specific connection medium between the communication interface 1303, the processor 1301, and the memory 1302.
  • the communication interface 1303, the processor 1301, and the memory 1302 are connected by a bus 1304.
  • the bus is shown by a thick line in FIG. 13, and the connection between other components is only for schematic illustration. , Not to limit.
  • the bus can be divided into an address bus, a data bus, and a control bus. For ease of representation, only a thick line is used in FIG. 13, but it does not mean that there is only one bus or one type of bus.
  • the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which may be implemented or Perform the disclosed methods, steps, and logical block diagrams in the embodiments of the present application.
  • the general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware processor, or may be executed and completed by a combination of hardware and software modules in the processor.
  • the memory may be a non-volatile memory, such as a hard disk (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), for example Random access memory (random-access memory, RAM).
  • the memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.
  • the memory in the embodiment of the present application may also be a circuit or any other device capable of realizing a storage function, which is used to store program instructions and / or data.
  • the disclosed device and method may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the modules or units is only a division of logical functions.
  • 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 be one physical unit or multiple physical units, that is, may be located in one place, or may be distributed in multiple different places . Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional 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.
  • the above integrated unit may be implemented in the form of hardware or software functional unit.
  • the methods provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented using software, it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions according to the embodiments of the present invention are generated.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, a network device, a terminal, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including a server, a data center, and the like integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, digital video disc (DVD)), or a semiconductor medium (for example, SSD), or the like.

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Abstract

本申请实施例公开了一种中继通信方法及装置，涉及通信领域，解决了在单向中继的场景下，远端设备移动到目标小区覆盖范围内时，远端设备如何通过中继设备与目标无线接入网设备进行上行链路通信的问题。具体方案为：当第一无线接入网设备接收到第一终端设备发送的第一信息后，可以根据第一信息确定在目标小区为第一终端设备提供中继服务的第二终端设备，第一信息用于指示第一终端设备为上行功率受限的终端设备，第一无线接入网设备向第二无线接入网设备发送第二信息，第二信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备。

Description

一种中继通信方法及装置
本申请要求于2018年11月22日提交国家知识产权局、申请号为201811401914.3、申请名称为“一种中继通信方法及装置”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
本申请实施例涉及通信领域，尤其涉及一种中继通信方法及装置。
背景技术
在第五代(the fifth generation，5G)移动通信技术中，对于功率受限的远端设备，远端设备可以通过中继(relay)设备与无线接入网设备通信，从而减小远端设备的功率消耗，这里的中继设备可以为终端设备，它们之间为侧链路(sidelink)。第三代合作伙伴计划(3rd generation partnership project 3GPP)课题讨论了双向中继和单向中继。所谓双向中继是指远端设备与无线接入网设备间的上行数据和下行数据均通过中继设备转发。单向中继是指远端设备与无线接入网设备间的上行数据通过中继设备转发，无线接入网设备与远端设备间的下行数据无需中继设备转发。在远端设备从源无线接入网设备的覆盖范围内移动到目标接入网设备的覆盖范围内时，远端设备如何通过中继设备与目标无线接入网设备进行上行数据通信是一个亟待解决的问题。
发明内容
本申请实施例提供一种中继通信方法及装置，解决了在单向中继的场景下，远端设备移动到目标小区覆盖范围内时，远端设备如何通过中继设备与目标无线接入网设备进行上行链路通信的问题。
为达到上述目的，本申请实施例采用如下技术方案：
第一方面，本申请实施例提供了一种中继通信方法，该方法可应用于第一无线接入网设备，或者该方法可应用于可以支持第一无线接入网设备实现该方法的通信装置，例如该通信装置包括芯片系统，方法包括：在第一无线接入网设备接收到第一终端设备发送的第一信息后，第一无线接入网设备向第二无线接入网设备发送第二信息。其中，第一信息用于指示第一终端设备为上行功率受限的终端设备，第二信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备，第二无线接入网设备为第一终端设备需要连接的目标小区所属的无线接入网设备。
本申请实施例提供的中继通信方法，在第一终端设备需要连接到第二无线接入网设备的目标小区的情况下，第一无线接入网设备可以根据第一终端设备为上行功率受限的终端设备的指示信息确定将第一终端设备与第二终端设备一起连接到目标小区，由第二终端设备在目标小区为第一终端设备提供中继服务，从而，实现远端设备依然可以通过中继设备与目标无线接入网设备进行上行通信。
结合第一方面，在第一种可能的实现方式中，在第一无线接入网设备接收第一终端设备发送的第一信息之后，方法还包括：依据协议规定，第一无线接入网设备可以 根据第一信息确定在目标小区为第一终端设备提供中继服务的第二终端设备。从而，第一无线接入网设备可以通过隐式指示方式确定在目标小区为第一终端设备提供中继服务的第二终端设备，将第一终端设备与第二终端设备一起连接到目标小区，能够有效地较少信令开销。
结合第一方面，在第二种可能的实现方式中，方法还包括：第一无线接入网设备还可以接收第一终端设备发送的第三信息，该第三信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备。从而，第一无线接入网设备可以通过显式指示方式确定在目标小区为第一终端设备提供中继服务的第二终端设备，将第一终端设备与第二终端设备一起连接到目标小区。
结合第一方面或上述各种可能的实现方式，在第三种可能的实现方式中，第二信息包括第一终端设备的标识和第二终端设备的标识，或者第二信息包括第二终端设备的标识。从而，以便于第二无线接入网设备确定第一终端设备与第二终端设备一起连接到目标小区，由第二终端设备在目标小区为第一终端设备提供中继服务。
可选的，第二信息也可以包括第四信息，第四信息用于指示第二终端设备在目标小区为第一终端设备提供中继服务。从而，第一无线接入网设备通过显式指示方式指示第二无线接入网设备由第二终端设备在目标小区为第一终端设备提供中继服务，将第一终端设备与第二终端设备一起连接到目标小区。
结合第一方面和上述可能的实现方式，在第五种可能的实现方式中，在第一无线接入网设备向第二无线接入网设备发送第二信息之后，方法还包括：第一无线接入网设备还可以接收第二无线接入网设备发送的第五信息和第六信息，并向第一终端设备发送第五信息，向第二终端设备发送第六信息。其中，第五信息包括目标小区标识和为第一终端设备分配的第一小区无线网络临时标识(cell-radio network temporary identifier，C-RNTI)，第六信息包括目标小区标识、为第二终端设备分配的第二C-RNTI和随机接入资源。从而，以便于第一终端设备和第二终端设备分别根据第五信息和第六信息与第二无线接入网设备建立连接。
需要说明的是，第五信息和第六信息可以被封装在由第二无线接入网设备发送给第一无线接入网设备的同一条接口消息中。从而，可以较少信令开销。
第二方面，本申请实施例提供了一种中继通信方法，该方法可应用于第一终端设备，或者该方法可应用于可以支持第一终端设备实现该方法的通信装置，例如该通信装置包括芯片系统，方法包括：第一终端设备向第一无线接入网设备发送第一信息，第一信息用于指示第一终端设备为上行功率受限的终端设备。
本申请实施例提供的中继通信方法，在第一终端设备需要连接到第二无线接入网设备的目标小区的情况下，第一终端设备可以向第一无线接入网设备上报第一终端设备为上行功率受限的终端设备的指示信息，以便于第一无线接入网设备可以根据第一终端设备为上行功率受限的终端设备的指示信息确定将第一终端设备与第二终端设备一起连接到目标小区，由第二终端设备在目标小区为第一终端设备提供中继服务，从而，实现远端设备依然可以通过中继设备与目标无线接入网设备进行上行通信。
结合第二方面，在第一种可能的实现方式中，第一终端设备根据第一信息确定第二信息，并向第一无线接入网设备发送第二信息。其中，第二信息用于指示在目标小 区为第一终端设备提供中继服务的第二终端设备。以便于第一无线接入网设备可以通过显式指示方式确定在目标小区为第一终端设备提供中继服务的第二终端设备，将第一终端设备与第二终端设备一起连接到目标小区。
结合第二方面和上述可能的实现方式，在第二种可能的实现方式中，方法还包括：第一终端设备接收第三信息，并根据第三信息通过第二终端设备与第二无线接入网设备的目标小区通信。其中，第三信息包括目标小区标识和为第一终端设备分配的第一C-RNTI。从而，第一终端设备可以根据第三信息与第二无线接入网设备建立连接。
第三方面，本申请实施例提供了一种中继通信方法，该方法可应用于第二无线接入网设备，或者该方法可应用于可以支持第二无线接入网设备实现该方法的通信装置，例如该通信装置包括芯片系统，方法包括：第二无线接入网设备接收第一无线接入网设备发送的第一信息，第一信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备。
本申请实施例提供的中继通信方法，在第一终端设备需要连接到第二无线接入网设备的目标小区的情况下，第二无线接入网设备根据第一无线接入网设备发送的第一信息确定在目标小区为第一终端设备提供中继服务的终端设备是第二终端设备，即第一终端设备与第二终端设备将一起连接到目标小区。从而，使得第二无线接入网设备可以为第一终端设备和第二终端设备分配第一终端设备与第二终端设备一起连接到目标小区所需的资源，由第二终端设备在目标小区为第一终端设备提供中继服务，实现远端设备依然可以通过中继设备与目标无线接入网设备进行上行通信。
示例的，第一信息可以包括第一终端设备的标识和第二终端设备的标识；或者，第一信息可以包括第二终端设备的标识。从而，使得第二无线接入网设备确定第一信息是关于第一终端设备与第二终端设备的信息，第一终端设备与第二终端设备将一起连接到目标小区。同时，第二无线接入网设备可以通过第一信息包括终端设备的标识的隐式指示方式确定在目标小区为第一终端设备提供中继服务的第二终端设备，第一终端设备与第二终端设备一起连接到目标小区，能够有效地较少信令开销。
结合第三方面，在一种可能的实现方式中，在第二无线接入网设备接收第一无线接入网设备发送的第一信息之后，方法还包括：第二无线接入网设备向第一无线接入网设备发送第二信息和第三信息，第二信息包括目标小区标识和为第一终端设备分配的第一C-RNTI，第三信息包括目标小区标识、为第二终端设备分配的第二C-RNTI和随机接入资源。从而，以便于第一无线接入网设备将第二信息传输给第一终端设备，将第三信息传输给第二终端设备，以便于第一终端设备和第二终端设备分别根据第二信息和第三信息与第二无线接入网设备建立连接。
第四方面，本申请实施例提供了一种中继通信方法，该方法可应用于第一无线接入网设备，或者该方法可应用于可以支持第一无线接入网设备实现该方法的通信装置，例如该通信装置包括芯片系统，方法包括：第一无线接入网设备接收到第一终端设备发送的第一信息之后，向第二无线接入网设备发送第二信息。其中，第一信息用于指示第一终端设备为上行功率受限的终端设备，第二信息用于指示第二无线接入网设备不需要为第一终端设备在目标小区分配随机接入资源，第二无线接入网设备为第一终端设备需要连接的目标小区所属的无线接入网设备。
本申请实施例提供的中继通信方法，在第一终端设备需要连接到第二无线接入网设备的目标小区的情况下，第一无线接入网设备可以根据第一终端设备为上行功率受限的终端设备的指示信息确定第一终端设备到第一无线接入网设备的上行链路是否保留，如第一终端设备可以通过第二终端设备保持与第一无线接入网设备上行链路的连接，第一无线接入网设备向第二无线接入网设备传输第一终端设备的上行数据。从而，实现远端设备依然可以通过中继设备与目标无线接入网设备进行上行通信。
结合第四方面，在第一种可能的实现方式中，在第一无线接入网设备接收第一终端设备发送的第一信息之后，方法还包括：第一无线接入网设备可以根据第一信息确定第一终端设备到第一无线接入网设备的上行链路是否保留。从而，第一无线接入网设备可以通过隐式指示方式确定第一终端设备到第一无线接入网设备的上行链路是否保留，能够有效地较少信令开销。
结合第四方面，在第二种可能的实现方式中，方法还包括：在第一终端设备需要连接到第二无线接入网设备的目标小区的情况下，第一无线接入网设备接收第一终端设备发送的第三信息，第三信息用于指示第一终端设备到第一无线接入网设备的上行链路是否保留。从而，第一无线接入网设备可以通过显式指示方式确定第一终端设备到第一无线接入网设备的上行链路是否保留。
结合第四方面或上述各种可能的实现方式，在第三种可能的实现方式中，在第一无线接入网设备接收第一终端设备发送的第一信息之后，方法还包括：第一无线接入网设备向第二无线接入网设备发送第一终端设备的标识。从而，以便于第二无线接入网设备确定第二信息是关于第一终端设备的信息。
结合第四方面和上述可能的实现方式，在第四种可能的实现方式中，在第一无线接入网设备向第二无线接入网设备发送第二信息之后，方法还包括：第一无线接入网设备接收到第二无线接入网设备发送的第四信息，并向第一终端设备发送第四信息。其中，第四信息包括目标小区标识和为第一终端设备分配的第一C-RNTI。从而，以便于第一终端设备根据第四信息与第二无线接入网设备建立连接。
第五方面，本申请实施例提供了一种中继通信方法，该方法可应用于第一终端设备，或者该方法可应用于可以支持第一终端设备实现该方法的通信装置，例如该通信装置包括芯片系统，方法包括：第一终端设备向第一无线接入网设备发送第一信息，第一信息用于指示第一终端设备为上行功率受限的终端设备。
本申请实施例提供的中继通信方法，在第一终端设备需要连接到第二无线接入网设备的目标小区的情况下，第一终端设备可以向第一无线接入网设备上报第一终端设备为上行功率受限的终端设备的指示信息，以便于第一无线接入网设备可以根据第一终端设备为上行功率受限的终端设备的指示信息确定第一终端设备到第一无线接入网设备的上行链路是否保留，如第一终端设备可以通过第二终端设备保持与第一无线接入网设备上行链路的连接，第一无线接入网设备向第二无线接入网设备传输第一终端设备的上行数据。从而，实现远端设备依然可以通过中继设备与目标无线接入网设备进行上行通信。
结合第五方面，在第一种可能的实现方式中，第一终端设备根据第一信息确定第二信息，并向第一无线接入网设备发送第二信息。其中，第二信息用于指示第一终端 设备到第一无线接入网设备的上行链路是否保留。以便于第一无线接入网设备可以通过显式指示方式确定第一终端设备到第一无线接入网设备的上行链路是否保留。
结合第五方面和上述可能的实现方式，在第二种可能的实现方式中，方法还包括：第一终端设备接收第三信息，并根据第三信息通过第二终端设备与第二无线接入网设备的目标小区通信。其中，第三信息包括目标小区标识和为第一终端设备分配的第一小区无线网络临时标识C-RNTI。从而，第一终端设备可以根据第三信息与第二无线接入网设备建立连接。
第六方面，本申请实施例提供了一种中继通信方法，该方法可应用于第二无线接入网设备，或者该方法可应用于可以支持第二无线接入网设备实现该方法的通信装置，例如该通信装置包括芯片系统，方法包括：第二无线接入网设备接收第一无线接入网设备发送的第一信息，第一信息用于指示第二无线接入网设备不需要为第一终端设备在目标小区分配随机接入资源。
本申请实施例提供的中继通信方法，在第一终端设备需要连接到第二无线接入网设备的目标小区的情况下，第二无线接入网设备根据第一无线接入网设备发送的第一信息确定第一终端设备到第一无线接入网设备的上行链路是否保留，如第一终端设备可以通过第二终端设备保持与第一无线接入网设备上行链路的连接，第一无线接入网设备向第二无线接入网设备传输第一终端设备的上行数据。从而，使得第二无线接入网设备可以为第一终端设备分配第一终端设备连接到目标小区所需的资源，由第二终端设备在目标小区为第一终端设备提供中继服务，实现远端设备依然可以通过中继设备与目标无线接入网设备进行上行通信。
结合第六方面，在第一种可能的实现方式中，方法还包括：第二无线接入网设备接收第一无线接入网设备发送的第一终端设备的标识。从而，使得第二无线接入网设备确定第一信息是关于第一终端设备的信息。
结合第六方面，在第二种可能的实现方式中，在第二无线接入网设备接收第一无线接入网设备发送的第一信息之后，方法还包括：第二无线接入网设备向第一无线接入网设备发送第二信息，第二信息包括目标小区标识和为第一终端设备分配的第一C-RNTI。从而，以便于第一无线接入网设备将第二信息传输给第一终端设备，以便于第一终端设备与第二无线接入网设备建立连接。
第七方面，本申请实施例提供了一种中继通信方法，该方法可应用于第二无线接入网设备，或者该方法可应用于可以支持第二无线接入网设备实现该方法的通信装置，例如该通信装置包括芯片系统，方法包括：第二无线接入网设备接收与第二终端设备对等的适配层头，以及与第一终端设备对等的第一载荷，适配层头包括第一终端设备的标识和第一终端设备与第二无线接入网设备对等的数据无线承载的标识，或者，适配层头包括第一终端设备的标识和第一终端设备与第二终端设备的逻辑信道的标识；第二无线接入网设备根据第一终端设备的标识和第一终端设备与第二无线接入网设备对等的数据无线承载的标识确定在第二无线接入网设备上与第一终端设备的数据无线承载标识对应的分组数据汇聚协议(packet data convergence protocol，PDCP)层实体，或者，根据第一终端设备的标识和第一终端设备与第二终端设备的逻辑信道的标识确定在第二无线接入网设备上与第一终端设备的逻辑信道标识对应的PDCP层实体。从 而，使得第二无线接入网设备可以确定接收到的数据是哪个终端设备通过哪个数据无线承载(data radio bearer，DRB)发送的数据。
需要说明的是，上述各个实施例中所述的目标小区标识可以由第一无线接入网设备确定，也可以由第二无线接入网设备确定。
示例的，在切换场景中，目标小区可以由源基站确定。假设源基站为第一无线接入网设备，目标基站为第二无线接入网设备，在第一无线接入网设备给第二无线接入网设备发送的切换请求(handover request)消息中可以携带目标小区标识(target cell identity)。
在辅基站添加的场景中，一种方法是主基站将测量报告发给辅基站，辅基站从测量报告包括的小区中选择一个小区作为主小区(PSCell)，即辅基站中的主小区，还可以选择其他个别小区作为辅小区(SCell)，即辅基站中的辅小区。另一种方法是主基站确定辅小区集合(Secondary Cell Group，SCG)，即主基站确定辅基站的所有小区集合，主基站向辅基站发送辅小区集合，再由辅基站从SCG中选择一个小区作为主小区，其他小区可以作为辅小区。这里所述主基站可以是第一无线接入网设备，辅基站可以是第二无线接入网设备。
第八方面，本申请实施例还提供了一种通信装置，用于实现上述第一方面或第四方面描述的方法。通信装置为第一无线接入网设备或支持第一无线接入网设备实现该第一方面或第四方面描述的方法的通信装置，例如该通信装置包括芯片系统。例如，该通信装置包括：接收单元和发送单元。例如，所述接收单元，用于接收第一终端设备发送的第一信息，第一信息用于指示第一终端设备为上行功率受限的终端设备。所述发送单元，用于向第二无线接入网设备发送第二信息，第二信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备，或者，第二信息用于指示第二无线接入网设备不需要为第一终端设备在目标小区分配随机接入资源。第二无线接入网设备为第一终端设备需要连接的目标小区所属的无线接入网设备。
可选地，具体的方法同第一方面或第四方面中相应的描述，这里不再赘述。
可选地，通信装置还可以包括处理单元，用于根据第一信息确定在目标小区为第一终端设备提供中继服务的第二终端设备。
第九方面，本申请实施例还提供了一种通信装置，用于实现上述第二方面或第五方面描述的方法。通信装置为第一终端设备和/或支持第一终端设备实现该第二方面或第五方面描述的方法的通信装置，例如该通信装置包括芯片系统。例如，通信装置包括：发送单元。所述发送单元，用于向第一无线接入网设备发送第一信息，第一信息用于指示第一终端设备为上行功率受限的终端设备。
可选地，具体的方法同第二方面或第五方面中相应的描述，这里不再赘述。
可选地，通信装置还可以包括处理单元。所述处理单元，用于根据第一信息确定第二信息，第二信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备。或者，第二信息用于指示第一终端设备到第一无线接入网设备的上行链路是否保留。所述发送单元，还用于向第一无线接入网设备发送第二信息。
第十方面，本申请实施例还提供了一种通信装置，用于实现上述第三方面和第六方面，以及第七方面描述的方法。通信装置为第二无线接入网设备和/或支持第二无线 接入网设备实现该第三方面和第六方面，以及第七方面描述的方法的通信装置，例如该通信装置包括芯片系统。例如，通信装置包括：接收单元。所述接收单元，用于接收第一无线接入网设备发送的第一信息，第一信息用于指示第二无线接入网设备不需要为第一终端设备在目标小区分配随机接入资源，或者，第一信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备。
可选地，具体的方法同第三方面和第六方面，以及第七方面中相应的描述，这里不再赘述。
可选地，通信装置还可以包括处理单元。处理单元，用于根据第一终端设备的标识和第一终端设备与第二无线接入网设备对等的数据无线承载的标识确定在第二无线接入网设备上与第一终端设备的数据无线承载标识对应的PDCP层实体，或者，根据第一终端设备的标识和第一终端设备与第二终端设备的逻辑信道的标识确定在第二无线接入网设备上与第一终端设备的逻辑信道标识对应的PDCP层实体。
需要说明的是，上述第八方面至第十方面的功能模块可以通过硬件实现，也可以通过硬件执行相应的软件实现。硬件或软件包括一个或多个与上述功能相对应的模块。例如，收发器，用于完成接收单元和发送单元的功能，处理器，用于完成处理单元的功能，存储器，用于处理器处理本申请实施例的方法的程序指令。处理器、收发器和存储器通过总线连接并完成相互间的通信。具体的，可以参考第一方面所述的方法至第六方面所述的方法中的第一终端设备、第一无线接入网设备和第二无线接入网设备的行为的功能。
第十一方面，本申请实施例还提供了一种通信装置，用于实现上述第一方面或第四方面描述的方法。通信装置为第一无线接入网设备或支持第一无线接入网设备实现该第一方面或第四方面描述的方法的通信装置，例如该通信装置包括芯片系统。例如所述通信装置包括处理器，用于实现上述第一方面或第四方面描述的方法的功能。所述通信装置还可以包括存储器，用于存储程序指令和数据。所述存储器与所述处理器耦合，所述处理器可以调用并执行所述存储器中存储的程序指令，用于实现上述第一方面或第四方面描述的方法中的功能。所述通信装置还可以包括通信接口，所述通信接口用于该通信装置与其它设备进行通信。示例性地，若所述通信装置为第一无线接入网设备，该其它设备为第一终端设备。
在一种可能的设备中，该通信装置包括：通信接口，所述通信接口用于所述通信装置和其它装置进行通信。示例性地，该通信接口可以是收发器，所述收发器用于接收第一终端设备发送的第一信息，第一信息用于指示第一终端设备为上行功率受限的终端设备。所述收发器还用于向第二无线接入网设备发送第二信息，第二信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备，或者，第二信息用于指示第二无线接入网设备不需要为第一终端设备在目标小区分配随机接入资源。第二无线接入网设备为第一终端设备需要连接的目标小区所属的无线接入网设备。
可选地，具体的方法同第一方面或第四方面中相应的描述，这里不再赘述。
可选地，通信装置还可以包括处理器。所述处理器，用于根据第一信息确定在目标小区为第一终端设备提供中继服务的第二终端设备。
第十二方面，本申请实施例还提供了一种通信装置，用于实现上述第二方面或第 五方面描述的方法。通信装置为第一终端设备和/或支持第一终端设备实现该第二方面或第五方面描述的方法的通信装置，例如该通信装置包括芯片系统。例如所述通信装置包括处理器，用于实现上述第二方面或第五方面描述的方法中的功能。所述通信装置还可以包括存储器，用于存储程序指令和数据。所述存储器与所述处理器耦合，所述处理器可以调用并执行所述存储器中存储的程序指令，用于实现上述第二方面或第五方面描述的方法中的功能。所述通信装置还可以包括通信接口，所述通信接口用于该通信装置与其它设备进行通信。示例性地，若所述通信装置为第一终端设备，该其它设备为第一无线接入网设备。
在一种可能的设备中，该通信装置包括：通信接口，所述通信接口用于所述通信装置和其它装置进行通信。示例性地，该通信接口可以是收发器。存储器，用于存储程序指令。所述收发器用于向第一无线接入网设备发送第一信息，第一信息用于指示第一终端设备为上行功率受限的终端设备。
可选地，通信装置还可以包括处理器。所述处理器，用于根据第一信息确定第二信息，第二信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备。或者，第二信息用于指示第一终端设备到第一无线接入网设备的上行链路是否保留。所述收发器，还用于向第一无线接入网设备发送第二信息。
可选地，具体的方法同第二方面或第五方面中相应的描述，这里不再赘述。
第十三方面，本申请实施例还提供了一种通信装置，用于实现上述第三方面和第六方面，以及第七方面描述的方法。通信装置为第二无线接入网设备和/或支持第二无线接入网设备实现该第三方面和第六方面，以及第七方面描述的方法的通信装置，例如该通信装置包括芯片系统。例如所述通信装置包括处理器，用于实现上述第三方面和第六方面，以及第七方面描述的方法中的功能。所述通信装置还可以包括存储器，用于存储程序指令和数据。所述存储器与所述处理器耦合，所述处理器可以调用并执行所述存储器中存储的程序指令，用于实现上述第三方面和第六方面，以及第七方面描述的方法中的功能。所述通信装置还可以包括通信接口，所述通信接口用于该通信装置与其它设备进行通信。示例性地，若所述通信装置为第二无线接入网设备，该其它设备为第一无线接入网设备。
在一种可能的设备中，该通信装置包括：通信接口，所述通信接口用于所述通信装置和其它装置进行通信。示例性地，该通信接口可以是收发器。存储器，用于存储程序指令。所述收发器用于接收第一无线接入网设备发送的第一信息，第一信息用于指示第二无线接入网设备不需要为第一终端设备在目标小区分配随机接入资源，或者，第一信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备。
可选地，具体的方法同第三方面和第六方面，以及第七方面中相应的描述，这里不再赘述。
可选地，通信装置还可以包括处理器。处理器，用于根据第一终端设备的标识和第一终端设备与第二无线接入网设备对等的数据无线承载的标识确定在第二无线接入网设备上与第一终端设备的数据无线承载标识对应的PDCP层实体，或者，根据第一终端设备的标识和第一终端设备与第二终端设备的逻辑信道的标识确定在第二无线接入网设备上与第一终端设备的逻辑信道标识对应的PDCP层实体。
第十四方面，本申请实施例还提供了一种计算机可读存储介质，包括：计算机软件指令；当计算机软件指令在通信装置中运行时，使得通信装置执行上述第一方面至第七方面任一个所述的方法。
第十五方面，本申请实施例还提供了一种包含指令的计算机程序产品，当计算机程序产品在通信装置中运行时，使得通信装置执行上述第一方面至第七方面任一个所述的方法。
第十六方面，本申请实施例提供了一种芯片系统，该芯片系统包括处理器，还可以包括存储器，用于实现上述方法中第一终端设备、第一无线接入网设备或第二无线接入网设备的功能。该芯片系统可以由芯片构成，也可以包含芯片和其他分立器件，例如放大器，数模转换器或模数转换器。
第十七方面，本申请实施例还提供了一种通信系统，所述通信系统包括第八方面描述的第一无线接入网设备或支持第一无线接入网设备实现该第一方面描述的方法的通信装置，以及第九方面描述的第一终端设备或支持第一终端设备实现该第二方面描述的方法的通信装置，第十方面描述的第二无线接入网设备或支持第二无线接入网设备实现该第三方面或第七方面描述的方法的通信装置；
或所述通信系统包括第十一方面描述的第一无线接入网设备或支持第一无线接入网设备实现该第一方面描述的方法的通信装置，以及第十二方面描述的第一终端设备或支持第一终端设备实现该第二方面描述的方法的通信装置，第十三方面描述的第二无线接入网设备或支持第二无线接入网设备实现该第三方面或第七方面描述的方法的通信装置。
另外，上述任意方面的设计方式所带来的技术效果可参见第一方面至第七方面中不同设计方式所带来的技术效果，此处不再赘述。
本申请实施例中，第一终端设备、第一无线接入网设备、第二无线接入网设备和通信装置的名字对设备本身不构成限定，在实际实现中，这些设备可以以其他名称出现。只要各个设备的功能和本申请实施例类似，属于本申请权利要求及其等同技术的范围之内。
附图说明
图1为本申请实施例提供的一种中继系统的简化结构示例图；
图2为本申请实施例提供的一种中继通信场景示例图；
图3为本申请实施例提供的一种中继通信方法的流程图；
图4为本申请实施例提供的另一种中继通信方法的流程图；
图5为本申请实施例提供的又一种中继通信方法的流程图；
图6为本申请实施例提供的再一种中继通信方法的流程图；
图7为本申请实施例提供的再一种中继通信方法的流程图；
图8为本申请实施例提供的再一种中继通信方法的流程图；
图9为本申请实施例提供的一种用户面协议栈示例图；
图10为本申请实施例提供的另一种用户面协议栈示例图；
图11为本申请实施例提供的又一种用户面协议栈示例图；
图12为本申请实施例提供的一种中继通信装置的组成示例图；
图13为本申请实施例提供的一种通信装置的组成示例图。
具体实施方式
本申请说明书和权利要求书中的术语“第一”、“第二”和“第三”等是用于区别不同对象，而不是用于限定特定顺序。
在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
下面将结合附图对本申请实施例的实施方式进行详细描述。
图1为本申请实施例提供的一种中继系统的简化结构示例图。该中继系统可以为长期演进(long term evolution，LTE)或者新无线(new radio，NR)系统，用于实现远端设备与无线接入网设备间的通信。如图1所示，该中继系统可以包括远端设备101、中继设备102以及无线接入网设备103。其中，远端设备101可以指距离无线接入网设备103较远的设备。远端设备101可以通过无线的方式与无线接入网设备103相连。由于远端设备101是上行功率受限的终端设备，无法与无线接入网设备103直接连接，而是通过一个或多个中继设备102与无线接入网设备103连接。
在本申请实施例中，所谓上行功率受限的终端设备是指由于终端设备的发射功率较低，无线接入网设备无法直接接收到终端设备向无线接入网设备发送的上行信号，终端设备发送的上行信号需要通过中继设备转发。
远端设备101可以与中继设备102间建立无线通信接口。根据远端设备101和中继设备102之间的无线通信接口方式，可以分为用户设备(user equipment，UE)类型中继设备和基站类型中继设备。UE类型中继设备，即中继设备和远端设备之间通过侧链路(sidelink)进行通信，使用3GPP标准规定的侧链路对应的方案，其中侧链路在某些文献中又称PC5链路，设备到设备(device to device，D2D)链路等等。基站类型中继设备，即中继设备和远端设备之间通过LTE空口或NR空口进行通信，使用3GPP标准规定的空口对应的方案。离无线接入网设备103最近的中继设备102可以与无线接入网设备103之间建立无线通信接口(如LTE空口或者NR空口)。
例如，当远端设备101需要向无线接入网设备103发送用户面数据或者控制面数据时，远端设备101可以通过远端设备101与中继设备102间的无线通信接口(如：PC5口)向中继设备102发送用户面数据或者控制面数据，中继设备102可以通过中继设备102与无线接入网设备103间的无线通信接口向无线接入网设备103发送远端设备101的用户面数据或者控制面数据。相对应的，当无线接入网设备103需要向远端设备101发送用户面数据或者控制面数据时，无线接入网设备103也可以通过中继设备102将用户面数据或者控制面数据发送给远端设备101。
本申请各实施例中，中继设备为UE类型中继，即终端设备，或者称为用户设备(user euqipment，UE)。
需要说明的是，图1所示网络架构仅为示例性架构图，虽然未示出，但除图1所示网络功能实体外，图1所示网络还可以包括其他功能实体，如：核心网网元等，不予限制。无线接入网设备103可以通过无线或有线方式与核心网设备连接。核心网设 备与无线接入网设备103可以是独立的不同的物理设备，也可以是将核心网设备的功能与无线接入网设备103的逻辑功能集成在同一个物理设备上，还可以是一个物理设备上集成了部分核心网设备的功能和部分的无线接入网设备103的功能。另外，本申请的实施例对该通信系统中包括的核心网设备、网络设备和终端设备的数量不做限定。
示例性的，图1中的远端设备101可以为远端用户设备(remote user equipment，remote UE)，如：可以为可穿戴设备(智能手表、智能手环等)，还可以为智能家具(或家电)、车联网中的汽车、工业互联网中的机械手臂、智能加油设备等其他距离无线接入网设备较远、需要通过中继设备与无线接入网设备连接的设备。
图1中的中继设备102可以为中继用户设备(relay user equipment，relay UE)，如：可以为各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备；还可以包括用户单元(subscriber unit)、蜂窝电话(cellular phone)、智能电话(smart phone)、无线数据卡、个人数字助理(personal digital assistant，PDA)电脑、平板型电脑、无线调制解调器(modem)、手持设备(handheld)、膝上型电脑(laptop computer)、无绳电话(cordless phone)或者无线本地环路(wireless local loop，WLL)台、机器类型通信(machine type communication，MTC)终端、移动台(mobile station，MS)等，不予限制。
图1中的无线接入网设备103可以是网络侧中一种用于发射或接收信号的实体。无线接入网设备还可以命名为接入网设备，主要用于实现无线物理实体功能、资源调度和无线资源管理、无线接入控制以及移动性管理等功能。示例性的，无线接入网设备可以为无线接入网(radio access network，RAN)下一代基站(generation nodeB，gNB)，或LTE基站eNB或其它任一接入单元。另外，在本申请实施例中，无线接入网设备为小区提供服务，远端设备通过该小区使用的传输资源(例如，频域资源)与无线接入网设备进行通信，该小区可以是无线接入网设备(例如基站)对应的小区，小区可以属于宏基站，也可以属于小小区(small cell)对应的基站，这里的小小区可以包括：城市小区(Metro cell)、微小区(Micro cell)、微微小区(Pico cell)、毫微微小区(Femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。此外，在其它可能的情况下，无线接入网设备可以是其它为远端设备提供无线通信功能的装置。本申请的实施例对无线接入网设备所采用的具体技术和具体设备形态不做限定。为方便描述，本申请实施例中，为远端设备提供无线通信功能的装置称为无线接入网设备。
无线接入网设备和远端设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上；还可以部署在空中的飞机、气球和卫星上。本申请的实施例对无线接入网设备和远端设备的应用场景不做限定。
无线接入网设备和远端设备之间以及远端设备和远端设备之间可以通过授权频谱(licensed spectrum)进行通信，也可以通过免授权频谱(unlicensed spectrum)进行通信，也可以同时通过授权频谱和免授权频谱进行通信。本申请的实施例对无线接入网设备和远端设备之间所使用的频谱资源不做限定。
上行链路(uplink)通常是指信号从终端设备到无线接入网设备的通道。下行链路(downlink)通常是指信号从无线接入网设备到终端设备的通道。在本申请实施例中， 双向中继的场景中，上行链路可以是指远端设备到中继设备的物理通道和中继设备到无线接入网设备的物理通道。下行链路可以是指无线接入网设备到中继设备的物理通道和中继设备到远端设备的物理通道。单向中继的场景中，上行链路可以是指远端设备到中继设备的物理通道和中继设备到无线接入网设备的物理通道。下行链路可以是指无线接入网设备到远端设备的物理通道。本申请的实施例可以适用于单向中继的场景。
虽然，现有中继技术标准中规定了远端设备可以通过中继设备与无线接入网设备进行相互通信，但是，在远端设备从源无线接入网设备的覆盖范围内移动到目标接入网设备的覆盖范围内时，远端设备如何通过中继设备与目标无线接入网设备进行上行链路通信未作出相应规定。
为了解决上述问题，本申请实施例提供一种中继通信方法，其基本原理是：当第一无线接入网设备接收到第一终端设备发送的第一信息后，可以根据第一信息确定在目标小区为第一终端设备提供中继服务的第二终端设备，第一信息用于指示第一终端设备为上行功率受限的终端设备，第一无线接入网设备向第二无线接入网设备发送第二信息，第二信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备。本申请实施例提供的中继通信方法，在第一终端设备需要连接到第二无线接入网设备的目标小区的情况下，第一无线接入网设备可以根据第一终端设备为上行功率受限的终端设备的指示信息确定将第一终端设备与第二终端设备一起连接到目标小区，由第二终端设备在目标小区为第一终端设备提供中继服务，从而，实现远端设备依然可以通过中继设备与目标无线接入网设备进行上行通信。
图2为本申请实施例提供的一种中继通信场景示例图。假设远端设备为第一终端设备，与远端设备直连的任一个或多个中继设备为第二终端设备，与远端设备当前连接的源无线接入网设备为第一无线接入网设备，第二无线接入网设备和第三无线接入网设备与第一无线接入网设备相邻。假设第一终端设备从第一无线接入网设备的覆盖范围内移动到第二无线接入网设备的覆盖范围内，远端设备需要连接的目标无线接入网设备为第二无线接入网设备为例，对本申请实施例提供的中继通信方法进行具体阐述。
示例性的，第一终端设备与第二终端设备间建立有无线通信接口，如：PC5口或侧链路，第一终端设备与第二终端设备可以通过PC5口或侧链路相互通信。第二终端设备与第一无线接入网设备间建立有无线通信接口，如：LTE空口或者NR空口，如LTE空口可以为Uu口，第二终端设备与第一无线接入网设备间可以通过LTE空口或者NR空口相互通信。或者第二终端设备与第一无线接入网设备间没有直接的无线通信接口，而是通过其他终端设备的中继与第一无线接入网设备保持连接。第一无线接入网设备与第二无线接入网设备间建立有有线通信接口，如：X2接口或Xn接口，第一无线接入网设备与第二无线接入网设备间可以通过LTE的X2接口或者NR的Xn接口相互通信。需要说明的是，本申请下述各实施例中各个网元之间的消息名字或消息中各参数的名字等只是一个示例，具体实现中也可以是其他的名字，本申请实施例对此不作具体限定。
在第一种可实现方式中，第一终端设备与无线接入网设备间的上行链路和下行链 路均进行切换或转移的情况下，可以由第一终端设备或第一无线接入网设备确定在目标小区为第一终端设备提供中继服务的终端设备可以是第二终端设备。如图3所示，该方法可以包括以下详细步骤。
S301、第一终端设备向第一无线接入网设备发送第一信息。
在第一终端设备接入第一无线接入网设备之后，第一终端设备向第一无线接入网设备发送第一信息，第一信息用于指示第一终端设备为上行功率受限的终端设备。或者，第一无线接入网设备可以先向第一终端设备发送请求消息，第一终端设备接收到请求消息后，根据请求消息向第一无线接入网设备发送所述第一信息，本申请实施例对此不再限定。需要说明的是，当前第一终端设备通过作为中继的第二终端设备与第一无线网络设备通信。
作为一个示例，第一信息可以通过3GPP标准中规定的UE分类(ue-category)信元来指示用于指示第一终端设备为上行功率受限的终端设备，当ue-category为category M1或category M2时，通过指示第一终端设备为带宽受限来表明所述第一终端设备的上行功率受限；当ue-category为category NB1或category NB2时，通过第一终端设备为窄带物联网(Narrow Band Internet of Things，NB-IoT)来表明所述第一终端设备的上行功率受限。可选地，可以新增加一类ue-category来直接表明所述第一终端设备上行功率受限。
第一终端设备可以将第一信息包含在UE能力信息中。例如，UE能力信息(UE Capability Information)消息中新增一个新的信元上行功率限制(uplink(UL)Power Constrained)，上行功率限制用于指示第一终端设备为上行功率受限的终端设备。或者在终端设备能力信息中心使用前述示例中的ue-category信元表示第一终端设备为上行功率受限的终端设备。第一终端设备可以主动向第一无线接入网设备发送包含第一信息的UE Capability Information消息，也可以是基于第一无线接入网设备向第一终端设备发送的请求消息向第一无线接入网设备发送包含第一信息的UE Capability Information消息。例如，第一无线接入网设备先向第一终端设备发送UE能力请求(UE Capability Enquiry)消息，然后第一终端设备向第一无线接入网设备反馈UE Capability Information消息。第一信息也可以包含在其他无线资源控制(radio resource control，RRC)消息中，例如其他RRC消息可以为RRC连接请求(RRC connection request或者RRC setup request)。最终，第一终端设备通过第二终端设备将第一信息转发给第一无线接入网设备。第二终端设备在转发上述RRC消息时，还可以携带第一终端设备的标识，第一终端设备的标识可以是第一终端设备在侧链路上的标识或者第一无线接入网设备给第一终端设备分配的标识，例如小区无线网络临时标识(cell-radio network temporary identifier，C-RNTI)，以便第一无线接入网设备确定是哪个终端设备发送的第一信息。在下文中，所述的第一终端设备的标识可以是第一终端设备在侧链路上的标识或者第一无线接入网设备给第一终端分配的标识，本申请对此不作限定。或者，第一终端设备可以将第一信息包含在第一终端设备和第二终端设备之间的协议层的包头内，例如PC5口的无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层、物理(physical，PHY)层或新增适配(adapation)层。第二终端设备接收到第一信息后，在第二终端设备和第一无线接入网设备之间的Uu协 议层内增加第一信息，还可以携带第一终端设备在侧链路上的标识或者第一无线接入网设备给第一终端分配的标识，例如C-RNTI，以便第一无线接入网设备确定是哪个终端设备发送的第一信息。第一终端设备在侧链路上的标识可以理解为第二终端设备能够识别第一终端设备的唯一标识。
在第一终端设备从第一无线接入网设备的覆盖范围内移动到第二无线接入网设备的覆盖范围内的过程中，第一终端设备可以进行邻区测量，得到与第一无线接入网设备相邻的其他无线接入网设备覆盖范围内的小区的小区标识，以及小区信号质量和/或小区信号功率等信息。如图2中所示的第二无线接入网设备覆盖范围内的小区的小区标识，以及小区信号质量和/或小区信号功率等信息，以及第三无线接入网设备覆盖范围内的小区的小区标识，以及小区信号质量和/或小区信号功率等信息。具体的测量方法可以参考现有技术本申请实施例在此不再赘述。在这种情况下，第一终端设备到第一无线接入网设备的覆盖范围内的小区的小区的信号质量可能会较差，需要重新连接到信号质量较好的无线接入网设备的覆盖范围内的小区。第一终端设备可以向第一无线接入网设备发送测量报告，测量报告包括N个小区的小区标识，以及第一终端设备测量到的N个小区的信号质量和/或信号功率，N为大于0的整数。
此外，第一终端设备还可以对与该第一终端设备相邻的中继设备进行测量，得到所述中继设备的标识，以及信号质量和/或信号功率。与该第一终端设备相邻的中继设备可以是第一无线接入网设备的覆盖范围内的中继设备，以及第一终端设备测量到的邻区的覆盖范围内的中继设备。从而，测量报告还可以包括中继信息。中继信息包括第一终端设备测量到的M个中继设备的标识，M为大于0的整数。可选的，第一终端设备也可以先根据预设规则对测量到的M个中继设备进行评估。例如，第一终端设备根据中继设备与第一终端设备间的距离或信号质量确定一个或多个中继设备，向第一无线接入网设备发送第一终端设备根据预设规则确定的X个中继设备的信息，X为大于0且小于等于M的整数。在这种情况下，中继信息包括的X个中继设备为与第一终端设备的距离小于预设门限或者信号质量大于预设门限的中继设备的标识。
可选的，中继设备在侧链路上发送发现信号(discovery signal)，在发现信号中包含中继设备连接的小区标识、基站标识中的一种或多种。小区标识可以是物理小区标识(Physical Cell Identity，PCI)、演进的通用移动通信系统的陆地无线接入网(Evolution Universal Mobile Telecommunications System Terrestrial Radio Access Network，E-UTRAN)小区全球标识(Cell Global Identity，CGI)、新空口小区全球标识(NR CGI)等。基站标识可以是全球基站标识(Global gNB ID或Global eNB ID或Global ng-eNB ID)、全球新空口无线接入网节点标识(Global NG-RAN Node ID)等。第一终端设备可以根据中继设备发送的发现信号，确定中继设备所连接的无线接入网设备。因此第一终端设备在给第一无线接入网设备上报测量报告时，除了包含中继设备标识、信号质量和/或信号功率外，还可能包含所述中继设备连接的小区标识、基站标识中的一个或多个。
S302、第一无线接入网设备接收第一终端设备发送的第一信息。
S303、第一无线接入网设备根据第一信息确定在目标小区为第一终端设备提供中继服务的第二终端设备。
在第一无线接入网设备接收到第一终端设备发送的第一信息和测量报告之后，决定将第一终端设备切换到目标小区所在的第二无线接入网设备，或者将目标小区所在的第二无线接入网设备增加为第一终端设备的辅基站。
示例性地，第一无线接入网设备可以根据A3事件或A4事件确定第一终端设备到目标小区的信号质量高于第一终端设备到源小区的信号质量，第一终端设备需要切换到目标小区。或者，第一无线接入网设备可以根据A5事件确定第一终端设备到目标小区的信号质量高于第一阈值，第一终端设备到源小区的信号质量低于第二阈值，第一终端设备需要连接到目标小区。其中，源小区是指第一终端设备当前连接的无线接入网设备覆盖范围内的小区，目标小区是指第一终端设备需要连接的无线接入网设备覆盖范围内的小区。或者需要增加目标小区所在的第二无线接入网设备为辅基站。在下文中，将切换到目标小区和增加目标小区所在的无线接入网设备为辅基站的行为，统称为连接到目标小区。在下文中，假设源小区是第一无线接入网设备覆盖范围内的小区。第一无线接入网设备确定第一终端设备需要连接到第二无线接入网设备覆盖范围内的小区，目标小区是第二无线接入网设备覆盖范围内的小区。
示例性地，目标小区标识可能由第一无线接入网设备确定并发送给第二无线接入网设备，也可能由第二无线接入网设备确定。例如在切换场景下，目标小区标识由第一无线接入网设备确定。在第一无线接入网设备给第二无线接入网设备发送切换请求(handover request)消息的时候携带所述目标小区标识。例如在辅基站添加的场景下，目标小区标识由第二无线接入网设备确定。一种可能的情况是，第一无线接入网设备将第一终端设备发送的测量报告或者与第二无线接入网设备相关的测量报告发送给第二无线接入网设备。第二无线接入网设备根据所述测量报告选择一个小区作为辅基站下的主小区，即本文提到的目标小区。第二无线接入网设备还可能选择1或多个小区作为辅基站下的辅小区。另一种可能的情况是，第一无线接入网设备根据第一终端设备发送的测量报告，选择合适的辅小区集合(Secondary Cell Group，SCG)并发送给第二无线接入网设备。第二无线接入网设备从辅小区集合中选择一个小区作为辅基站下的主小区，即本文提到的目标小区。第二无线接入网设备还可能从所述辅小区集合中选择1或多个小区作为辅基站下的辅小区。
第一信息用于指示第一终端设备为上行功率受限的终端设备，第一无线接入网设备可以根据第一信息确定第一终端设备向第一无线接入网设备发送的上行信号无法直接到达第一无线接入网设备，需要中继设备进行转发后第一无线接入网设备才能接收到第一终端设备发送的上行信号。或者，第一终端设备通过第二终端设备转发第一信息给第一无线接入网设备，第一无线接入网设备从而获知第一终端设备需要中继设备转发后才能将上行信号发射给自己。
在第一无线接入网设备接收到的测量报告不包括中继信息的情况下，且第一终端设备通过第二终端设备连接到第一无线接入网设备，第一无线接入网设备可以根据第一信息确定在目标小区为第一终端设备提供中继服务的终端设备可以是第二终端设备，可理解的是，即第一无线接入网设备确定将第一终端设备和第二终端设备一起连接到目标小区所在的第二无线接入网设备。可选的，第一无线接入网设备也可以接收第一终端设备发送的指示信息，该指示信息用于指示第二无线接入网设备未发现合适的中 继设备。
在第一无线接入网设备接收到的测量报告包括中继信息的情况下，但是第一无线接入网设备无法确认接收到的中继信息对应的中继设备与第二无线接入网设备是否有连接，第一无线接入网设备也可以根据第一信息确定在目标小区为第一终端设备提供中继服务的终端设备可以是第二终端设备，可理解的，即第一无线接入网设备确定将第一终端设备和第二终端设备一起连接到目标小区所在的第二无线接入网设备。
可选的，若第一无线接入网设备可以确认接收到的中继信息对应的中继设备中存在与第二无线接入网设备有连接的中继设备，当第一终端设备发送的测量报告中包含中继设备连接的小区标识和/或基站标识时，第一无线接入网设备可以据此判断第一终端设备可能无法找到与第二无线接入网设备有连接的中继设备时，第一无线接入网设备确定将第一终端设备和第二终端设备一起连接到目标小区所在的第二无线接入网设备。或者第一终端设备可能无法确定中继设备和第二无线接入网设备是否有连接，但是第一无线接入网设备和第二无线接入网设备预先在X2接口或Xn接口交互过其覆盖范围内的中继设备列表，包含每个中继设备在侧链路的标识。那么第一无线接入网设备根据第一终端设备发送的测量报告中包含的中继设备的信息，可以判断所述中继设备和第二无线网络设备是否有连接。当第一终端设备可以找到与第二无线接入网设备有连接的中继设备时，第一终端设备可以利用第二无线接入网设备覆盖范围内的中继设备为第一终端设备提供中继服务，该方法不在本方案讨论范围内，在此不再赘述。
需要说明的是，第一无线接入网设备接收到第一终端设备发送的第一信息和测量报告是通过第二终端设备转发给第一无线接入网设备的，具体的转发过程可以参考传统技术，本申请实施例在此不再赘述。
另外，本申请实施例提供的中继通信方法是针对单向中继的场景，第一终端设备还可以接收到第一无线接入网设备发送的下行信号，所述下行信号无需中继设备转发，因此，第一无线接入网设备和第一终端设备可以根据传统技术执行切换流程或双连接(Dual Connectivity，DC)的辅基站添加流程，第一终端设备切换或双连接到第二无线接入网设备覆盖范围内的小区下继续进行下行通信，具体的可以参考现有技术的详述，本申请实施例在此不再赘述。
S304、第一无线接入网设备向第二无线接入网设备发送第二信息。
第二信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备。示例的，第二信息可以包括第一终端设备的标识和第二终端设备的标识。可选的，第二信息包括第二终端设备的标识。可选的，第二信息可以包括第三信息，第三信息用于指示第二终端设备在目标小区为第一终端设备提供中继服务。可选的，第二信息可以包括第二终端设备的标识和第三信息，第三信息用于指示第二终端设备在目标小区为第一终端设备提供中继服务。
需要说明的是，第一无线接入网设备可以采用切换流程中的切换请求消息向第二无线接入网设备发送第二信息；也可以采用辅基站添加请求消息(SeNB addition request或者SgNB addition request)向第二无线接入网设备发送第二信息。例如，在第一种可能的情况下，在切换请求消息或辅基站添加请求消息中增加1个信元即第二信息，该信元的具体形式可以是中继标识(relay ID)。其中，relay ID可能是第二终端设备在 侧链路的标识，也可以是第一无线接入网设备给第二终端设备配置的一个标识，例如C-RNTI或者其他用于唯一识别第二终端设备的标识。在第二种可能的情况下，在切换请求消息或辅基站添加请求消息中新增2个信元即第二信息，一个是UE ID，另一个是relay ID。其中UE ID可以是第一终端设备在侧链路的标识，也可以是第一无线接入网设备给第一终端设备配置的一个标识，例如C-RNTI或者其他用于唯一识别第一终端设备的标识。relay ID同上解释。在第三种可能的情况下，在切换请求消息或辅基站添加请求消息中新增1个信元即第三信息，例如增加中继绑定(addrelaytogether)，该信元可以包含真(true)和假(false)两个值。也可以是addrelaytogether信元没有值，只要包含addrelaytogether信元就表示第二终端设备在目标小区为第一终端设备提供中继服务。第四种可能的情况下，在切换请求消息或辅基站添加请求消息中新增2个信元，一个是relay ID，一个是增加中继绑定，具体解释同上。即增加中继绑定信元用于指示relay ID在目标小区为第一终端设备提供中继服务。
辅基站添加请求消息还可以包含数据发送请求(data forwarding request)指示，第二无线接入网设备接收到数据发送请求指示后，向第一无线接入网设备反馈给第一终端设备配置的数据无线承载(data radio bearer，DRB)或协议数据单元(protocol data unit，PDU)会话粒度的用户层面的通用分组无线业务隧道协议(general packet radio service tunnelling protocol for the user plane，GTP-U)隧道信息，用于第一无线接入网设备发送第一终端设备尚未递交到核心网的上行数据或第一无线接入网设备尚未发送或尚未收到第一终端设备确认消息的下行数据。例如第二无线接入网设备发送GTP-U隧道信息包含DRB标识或PDU会话标识，以及GTP-U隧道地址信息，例如IP地址，隧道端点信息(Tunnel Endpoint IDentity，TEID)。此外，第二无线接入网设备还可能向第一无线接入网设备反馈给第二终端设备配置的DRB或PDU会话粒度的用户面的GTP-U隧道信息，用于第一无线接入网设备发送给第二终端设备尚未递交到核心网的上行数据或第一无线接入网设备尚未发送或尚未收到第二终端设备确认消息的下行数据。
S305、第二无线接入网设备接收第一无线接入网设备发送的第二信息。
在下文中，协议规定可以指事先约定的、需要设备间共同遵守的规则。示例的，若第二信息包括第二终端设备的标识，第二无线接入网设备可以根据第二信息确定第一无线接入网设备指示在目标小区为第一终端设备提供中继服务的终端设备为第二终端设备。若第二信息包括第一终端设备的标识和第二终端设备的标识，第二无线接入网设备可以根据第一终端设备的标识和第二终端设备的标识确定第一无线接入网设备指示在目标小区为第一终端设备提供中继服务的终端设备为第二终端设备。若第二信息包括第三信息，第二无线接入网设备可以根据第三信息确定在目标小区为第一终端设备提供中继服务的终端设备为第二终端设备，第三信息用于指示第二终端设备在目标小区为第一终端设备提供中继服务。若第二信息包括第二终端设备的标识和第三信息，第二无线接入网设备可以根据第二终端设备标识和第三信息确定在目标小区为第一终端设备提供中继服务的终端设备为第二终端设备。
本申请实施例提供的中继通信方法，在第一终端设备需要连接到第二无线接入网设备的目标小区的情况下，第一无线接入网设备可以根据第一终端设备为上行功率受 限的终端设备的指示信息确定将第一终端设备与第二终端设备一起连接到目标小区，由第二终端设备在目标小区为第一终端设备提供中继服务，从而，实现远端设备依然可以通过中继设备与目标无线接入网设备进行上行通信。
进一步的，在第二无线接入网设备接收第一无线接入网设备发送的第二信息，即S305之后，如图4所示，本申请实施例还包括以下步骤。
S401、第二无线接入网设备向第一无线接入网设备发送第四信息和第五信息。
第四信息包括目标小区标识和为第一终端设备分配的第一C-RNT。其中目标小区标识可能由第一无线接入网设备确定并发送给第二无线接入网设备，也可能由第二无线接入网设备确定。具体介绍参见S303，这里不再赘述。第四信息还可以包含给第一终端设备的无线资源专有配置(Radio Resource Config Dedicated)，例如，无线资源专有配置包含信令无线承载列表、数据无线承载列表、媒体接入控制主配置(MAC-Main Config)和物理专有配置(Physical Config Dedicated)等。第五信息包括目标小区标识、为第二终端设备分配的第二C-RNTI和随机接入资源。特别的，第五信息中包含的目标小区标识和第四信息中包含的目标小区标识相同。其中，随机接入资源包含随机接入前导码索引(ra-Preamble Index)，随机接入掩码索引(ra-PRACH-Mask Index)，无线资源公共配置(Radio Resource Config Comm)等中的一种或多种。其中Radio Resource Config Comm主要包含随机接入公共配置、广播控制信道公共配置和寻呼控制信道公共配置等。第五信息还可以包含给第二终端设备的无线资源专有配置(Radio Resource Config Dedicated)。无线资源专有配置除了包含给第二终端设备配置的信令无线承载列表、数据无线承载列表、MAC-Main Config和Physical Config Dedicated等。所述无线资源专有配置中还可能包含第一C-RNTI，以及给第二终端设备配置的第二终端设备的信令无线承载与第一终端设备的信令无线承载的映射关系，或给第二终端设备配置的第二终端设备的数据无线承载与第一终端设备的数据无线承载的映射关系。例如，第二终端设备的SRB1对应第一终端设备的SRB1，第二终端设备的DRB1对应第一终端设备的DRB1和DRB2，第二终端设备的DRB2对应第一终端设备的DRB3。或者所述无线资源专有配置中包含第二终端设备的信令无线承载与第一终端设备和第二终端设备的侧链路逻辑信道的映射关系，或第二终端设备的数据无线承载与第一终端设备和第二终端设备的侧链路逻辑信道的映射关系。例如第二终端设备的SRB1对应第一终端设备和第二终端设备的逻辑信道1，即LCID＝1，第二终端设备的DRB1对应第一终端设备和第二终端设备的逻辑信道2和逻辑信道3，即LCID＝2和LCID＝3。再或者所述无线资源专有配置中包含第二终端设备的信令/数据无线承载与第一终端设备和第二终端设备的侧链路逻辑信道的映射关系，以及和第一终端设备的信令/数据无线承载的映射关系。例如第二终端设备的SRB1对应第一终端设备和第二终端设备的逻辑信道1，即LCID＝1，同时对应第一终端设备的SRB1。第二终端设备的DRB1对应第一终端设备和第二终端设备的逻辑信道2和逻辑信道3，即LCID＝2和LCID＝3，同时对应第一终端设备的DRB1和DRB2。
另外，第四信息和第五信息可以被封装在第二无线接入网设备给第一无线接入网设备发送的同一条接口消息中，例如切换请求确认(handover request acknowledge)消息中，或者辅基站添加请求确认消息(SeNB/SgNB addition request acknowledge)消息 中。示例的，在切换请求确认消息或辅基站添加请求确认消息中，包含2个信元，一个信元包含第四信息，另一个信元包含第五信息。为了让第一无线接入网设备获知第四信息是发送给第一终端设备，第五信息是发送给第二终端设备的，第一无线接入网设备需要在提供第四信息和第五信息时进行指示。例如当第二无线接入网设备发送切换请求确认消息时，将一个信元定义为目标基站给源基站的透传容器(Target eNB/gNB to Source eNB/gNB Transparent Container)，包含第四信息。将另一个信元定义为目标基站给源基站的针对中继的透传容器(Target eNB to Source eNB transparent Container for relay)，包含第五信息。或者定义目标基站给源基站的透传容器列表(Target eNB/gNB to Source eNB/gNB transparent Container List)，里面出现的第一个信元包含第四信息，第二个信元包含第五信息。当第二无线接入网设备发送辅基站添加请求确认消息时，将一个信元定义为辅基站给主基站的容器(SeNB/SgNB to MeNB/MgNB Container)，包含第四信息。将另一个信元定义为辅基站给主基站的针对中继的容器(SeNB/SgNB to MeNB/MgNB Container for relay)，包含第五信息。或者定义辅基站给主基站的容器列表(SeNB/SgNB to MeNB/MgNB Container List)，里面出现的第一个信元包含第四信息，第二个信元包含第五信息。
S402、第一无线接入网设备接收第二无线接入网设备发送的第四信息和第五信息。
S403、第一无线接入网设备向第一终端设备发送第四信息。
第一无线接入网设备将第四信息发送给第一终端设备。例如对于切换的场景，第二无线接入网设备发送给第一无线接入网设备发送的切换命令(Handover Command)消息，该切换命令消息中包含第四信息，例如切换命令消息可以是下行专有控制信道消息(DL-DCCH-Message)。第一无线接入网收到后，将所述第四信息发送给第一终端设备。例如对于辅基站添加场景，第二无线接入网设备给第一无线接入网设备发送的SCG-Config消息，该SCG-Config消息中包含第四信息，例如SCG-Config消息可以是scg-RadioConfig-r12。第一无线接入网收到后，将所述第四信息发送给第一终端设备。
S404、第一终端设备接收第一无线接入网设备发送的第四信息。
第一终端设备接收到目标小区标识和第一C-RNTI后，连到目标小区，与目标小区建立连接进行通信。针对第一无线接入网设备在第二信息中不包含第一终端设备的标识的情况，例如第一终端设备通过第二终端设备发送RRC连接请求消息，里面包含第一C-RNTI。当第二无线接入网设备接收第二终端设备转发的RRC连接请求消息，获取第一C-RNTI后，得知第一终端设备已经通过第二终端设备连接上来。后续第二无线网接入设备给第一终端直接发送下行数据。针对第一无线接入网设备在第二信息中包含第一终端设备的标识的情况，一种方法同上，即第一无线接入网设备根据RRC连接请求消息中携带的第一C-RNTI识别第一终端设备。另一种方法是，第二终端设备在转发第一终端设备发送的RRC连接请求消息时，在RRC连接请求消息外面增加适配层，适配层包含第一终端设备的标识(比如第一终端设备在侧链路的标识)以及其他信息。第二无线接入网设备在接收第二终端设备转发的来自于第一终端设备的RRC连接请求消息时，通过读取适配层获取第一终端设备的标识。第二无线接入网设备通过对比适配层获取的第一终端设备的标识，以及第一无线接入网设备在第二消息 中包含的第一终端设备的标识，可以确认第一终端设备已经通过第二终端设备连接上来。
S405、第一无线接入网设备向第二终端设备发送第五信息。
第一无线接入网设备可以直接将第五信息发送给第二终端设备，也可以将第五信息包含在无线资源控制(radio resource control，RRC)重配置消息(例如，RRC Connection Reconfiguration或RRC Reconfiguration)中，向第二终端设备发送第五信息。或者，第一无线接入网设备可以将第五信息包含下行控制信息(downlink control information，DCI)或MAC控制信元(Control Element，CE)或其他协议层中，向第二终端设备发送第五信息。
S406、第二终端设备接收第一无线接入网设备发送的第五信息。
第二终端设备接收到目标小区标识、第二C-RNTI和随机接入资源后，根据协议规定可以确定在目标小区为第一终端设备提供中继服务的终端设备为第二终端设备，第二终端设备连接到目标小区，与目标小区建立连接为第一终端设备提供中继服务。例如，第二终端设备根据第五信息中包含的随机接入资源向第二无线接入网设备的目标小区发起随机接入，当第二无线接入网设备根据随机接入资源即可以判断第二终端设备即之前第一无线接入网设备指定需要接入的中继设备。可选的，第五信息还可以包括指示信息，明确指示第二终端设备在目标小区为第一终端设备提供中继服务。
针对第一无线接入网设备在第二信息中不包含第二终端设备的标识的情况，例如第二终端设备根据随机接入资源接入第二无线接入网设备，第二无线接入网设备根据第二终端发送的前导码，或者根据第二终端设备在特定的时频资源发送前导码，可以确定第二终端设备已经接入。针对第一无线接入网设备在第二信息中包含第二终端的标识的情况，例如第二终端设备在RRC连接建立请求消息中携带第一无线接入网设备在第二消息中包含的第二终端设备的标识，例如第二终端设备在侧链路的标识，第二无线接入网设备通过读取RRC连接建立请求消息中第二终端设备的标识，可以确定第二终端设备已经接入。
需要说明的是，本申请实施例提供的中继通信方法步骤的先后顺序可以进行适当调整，步骤也可以根据情况进行相应增减，示例的，如S403和S405之间的前后顺序可以互换，即第一无线接入网设备可以先向第二终端设备发送第五信息，再向第一终端设备发送第四信息，第二终端设备接收第一无线接入网设备发送的第五信息，第一终端设备接收第一无线接入网设备发送的第四信息。任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化的方法，都应涵盖在本申请的保护范围之内，因此不再赘述。
可选的，在一种可能的实现方式中，可以无需第一无线接入网设备根据第一信息确定在目标小区为第一终端设备提供中继服务的第二终端设备，即无需执行S303，可以由第一终端设备向第一无线接入网设备发送指示信息，指示在目标小区为第一终端设备提供中继服务的第二终端设备。如图5所示，本申请实施例还可以包括以下步骤。
S501、第一终端设备根据第一信息确定第六信息。
第六信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备，例如第六信息可以包含第二终端设备的标识，或者包含第二终端设备在目标小区为第一 终端设备提供中继服务的指示信息，或者包含第二终端设备的标识和第二终端设备在目标小区为第一终端设备提供中继服务的指示信息。
S502、第一终端设备向第一无线接入网设备发送第六信息。
需要说明的是，第一终端设备可以将第六信息包含在RRC消息中，通过第二终端设备将第六信息转发给第一无线接入网设备。或者，第一终端设备可以将第六信息包含在第一终端设备和第二终端设备之间的协议层的包头内，例如PC5口的RLC层、MAC层、PHY层或新增适配层。第二终端设备接收到第六信息后，在第二终端设备和第一无线接入网设备之间的Uu协议层内增加第六信息，还可以携带第一终端设备的标识，以便第一无线接入网设备确定是哪个终端设备发送的第六信息。当第一无线接入网设备接收到第六信息后，确定第二终端设备在目标小区为第一终端设备提供中继服务。当第六信息包含第二终端设备的标识时，第一无线接入网设备直接确定第二终端设备的标识。当第六信息包含第二终端设备在目标小区为第一终端设备提供中继服务的指示信息时，第一无线接入网设备根据帮助第一终端设备转发所述第六信息的第二终端设备确定第二终端设备的标识。当第六信息包含第二终端设备的标识和第二终端设备在目标小区为第一终端设备提供中继服务的指示信息时，第一无线接入网设备确定所述第二终端设备在目标小区为第一终端设备提供中继服务。
S503、第一无线接入网设备接收第一终端设备发送的第六信息。执行S304及以后步骤。
在另一种可能的实现方式，第一终端设备可以向第二终端设备发送第七信息和目标小区标识。其中，第七信息用于指示第一终端设备即将切换或连接到目标小区，请求第二终端设备也一起切换或双连接到目标小区。第一终端设备可以根据第一无线接入网设备的切换命令获取目标小区标识，也可能通过测量报告自行选择目标小区标识。
第二终端设备接收到第一终端设备发送的第七信息和目标小区标识之后，向第一无线接入网设备发送第八信息和目标小区标识，第八信息用于请求切换或双连接到目标小区。
第一无线接入网设备接收到第二终端设备发送的第八信息和目标小区标识之后，向第二终端设备发送双连接或切换配置消息。切换配置消息中可以包括确认信息，所述确认信息用于第一无线接入网设备同意第二终端设备继续在目标小区为第一终端设备提供服务。举例来说，第一无线接入网设备给第二终端设备配置双连接，将第二无线接入网设备配置为辅基站，为第一终端设备转发的DRB为辅小区集合承载(SCGbearer)类型。不同于传统的双连接SCG bearer，第二终端设备和辅基站的连接中，第二终端设备侧只有RLC层、MAC层、PHY层、适配层。而传统的双连接SCG bearer，终端设备和辅基站之间应该是完整的PDCP层、RLC层、MAC层、PHY层。例如在第二无线接入网设备提供的第五信息中，数据无线承载列表中不包含PDCP层配置即PDCP-Config。
在第二种可实现方式中，第一终端设备与无线接入网设备间的下行链路和上行链路分离的情况下，第一终端设备与无线接入网设备间的下行链路可进行切换，并由第一终端设备或第一无线接入网设备确定第一终端设备到第一无线接入网设备的上行链路是否保留。例如，第一终端设备的下行链路切换或转移到第二无线接入网设备下， 但是上行链路还保留和第一无线接入网设备的连接。此处称之为第一终端设备与无线接入网设备间的下行链路和上行链路分离，则在第一种可实现方式中，第一终端设备与无线接入网设备间的下行链路和上行链路属于不分离的场景。如图6所示，该方法可以包括以下详细步骤。
S601、第一终端设备向第一无线接入网设备发送第一信息。
具体的详细解释可以参考S301的阐述，本申请实施例在此不再赘述。
S602、第一无线接入网设备接收第一终端设备发送的第一信息。
S603、第一无线接入网设备根据第一信息确定第一终端设备到第一无线接入网设备的上行链路是否保留。
在第一无线接入网设备接收到第一终端设备发送的第一信息和测量报告之后，第一无线接入网设备可以上报测量报告包括的小区信息确定目标小区。具体的详细解释可以参考S303的阐述，本申请实施例在此不再赘述。
第一信息用于指示第一终端设备为上行功率受限的终端设备，第一无线接入网设备可以根据第一信息确定第一终端设备向第一无线接入网设备发送的上行信号无法直接到达第一无线接入网设备，需要中继设备进行转发后第一无线接入网设备才能接收到第一终端设备发送的上行信号。或者，第一终端设备通过第二终端设备转发第一信息给第一无线接入网设备，第一无线接入网设备从而获知第一终端设备需要中继设备转发后才能将上行信号发送给自己。
第一无线接入网设备可以根据第一信息确定第一终端设备到第一无线接入网设备的上行链路是否保留。可以理解的，在第一无线接入网设备接收到测量报告不包括中继信息的情况下，第一无线接入网设备可以根据第一信息确定第一终端设备到第一无线接入网设备的上行链路保留。例如，第一无线接入网设备确定第二终端设备在第一无线接入网设备的覆盖范围内为第一终端设备提供中继服务，即第一终端设备到第一无线接入网设备的上行链路保留。
在第一无线接入网设备接收到测量报告包括中继信息的情况下，但是第一无线接入网设备无法确认中继设备与第二无线接入网设备是否有连接，第一无线接入网设备可以根据第一信息确定第一终端设备到第一无线接入网设备的上行链路保留。可选的，若第一无线接入网设备可以确认接收到的中继信息对应的中继设备中存在与第二无线接入网设备有连接的中继设备，第一无线接入网设备可以根据第一信息确定第一终端设备到第一无线接入网设备的上行链路不保留，即可以确定第一终端设备可以利用第二无线接入网设备的覆盖范围内的中继设备连接到第二无线接入网设备，所述中继设备为第一终端设备提供中继服务。可理解的，第一终端设备可以通过所述中继设备和第二无线接入网设备建立上行链路。需要说明的是，第二无线接入网设备的覆盖范围内的中继设备可以是距离第一终端设备最近的或是距离第二无线接入网设备最近的终端设备，或距离第一终端设备的信号质量最高的或是距离第二无线接入网设备的信号质量最高的终端设备，本申请实施例在此不作限定。
其他详细解释可以参考S303的阐述，本申请实施例在此不再赘述。在第一无线接入网设备根据第一信息确定第一终端设备到第一无线接入网设备的上行链路是否保留之后，第一无线接入网设备需要指示第二无线接入网设备不需要为第一终端设备在目 标小区分配随机接入资源。在实际应用中，可以采用隐式指示方式或显示方式来通知第二无线接入网设备。例如，在S603之后，可以执行S604a或S604b。
可选的，第一无线接入网设备可以通过显式指示方式告知第二无线接入网设备不需要为第一终端设备在目标小区分配随机接入资源。如下所示，本申请实施例可以包括以下步骤。
S604a、第一无线接入网设备向第二无线接入网设备发送第二信息。
第二信息用于指示第二无线接入网设备不需要为第一终端设备在目标小区分配随机接入资源。
S605a、第二无线接入网设备接收第一无线接入网设备发送的第二信息。
可选的，第一无线接入网设备可以通过隐式指示方式告知第二无线接入网设备不需要为第一终端设备在目标小区分配随机接入资源。如下所示，本申请实施例可以包括以下步骤。
S604b、第一无线接入网设备向第二无线接入网设备发送第一信息。
S605b、第二无线接入网设备接收第一无线接入网设备发送的第一信息。
根据协议规定，第二无线接入网设备接收到第一无线接入网设备发送的第一信息之后，可以确定第二无线接入网设备不需要为第一终端设备在目标小区分配随机接入资源。
可选的，第一无线接入网设备还可以向第二无线接入网设备发送目标小区标识和第一终端设备的标识。例如，在S604a或S604b之后，可以执行S606和S607。
S606、第一无线接入网设备向第二无线接入网设备发送第一终端设备的标识。需要说明的是，S606可以和S604a或S604b一起进行，即第一无线接入网设备发送第二信息和第一终端设备的标识，或者第一无线接入网设备发送第一信息和第一终端设备的标识。
S607、第二无线接入网设备接收第一无线接入网设备发送的第一终端设备的标识。
需要说明的是，第一无线接入网设备可以采用切换流程中的切换请求消息向第二无线接入网设备发送第一终端设备的标识，以及第一信息或第二信息；也可以采用辅基站添加请求消息(SeNB/SgNB addition request)向第二无线接入网设备发送第一终端设备的标识，以及第一信息或第二信息。本申请对此不作限定。当然，第一无线接入网设备也可以确定目标小区标识，并发送给第二无线接入网设备，也可能由第二无线接入网设备确定。具体介绍参见S303，这里不再赘述。
本申请实施例提供的中继通信方法，在第一终端设备需要连接到第二无线接入网设备的目标小区的情况下，第一无线接入网设备可以根据第一终端设备为上行功率受限的终端设备的指示信息确定第一终端设备到第一无线接入网设备的上行链路是否保留，如第一终端设备可以通过第二终端设备保持与第一无线接入网设备上行链路的连接，第一无线接入网设备向第二无线接入网设备传输第一终端设备的上行数据。从而，实现远端设备依然可以通过中继设备与目标无线接入网设备进行上行通信。
进一步的，在第二无线接入网设备接收第一无线接入网设备发送的第一终端设备的标识、目标小区标识、第一信息或第二信息，即S605a、S605b或S607之后，可以执行S701～S704，如图7所示，具体的详细解释可以参考S401～S404的阐述，本申请 实施例在此不再赘述。
可选的，在一种可能的实现方式中，可以无需第一无线接入网设备根据第一信息确定第一终端设备到第一无线接入网设备的上行链路是否保留，即无需执行S603，在第一终端设备需要连接到第二无线接入网设备的目标小区的情况下，可以由第一终端设备向第一无线接入网设备发送指示信息，指示第一终端设备到第一无线接入网设备的上行链路是否保留。如图8所示，本申请实施例还可以包括以下步骤。
S801、第一终端设备根据第一信息确定第三信息。
第三信息用于指示请求第一终端设备到第一无线接入网设备的上行链路是否保留。例如第一终端设备根据第一信息确定自身为上行功率受限的设备。然后，如果第一终端设备根据测量结果确定未发现与第二无线接入网设备有连接的中继设备，则确定自身到第一无线接入网设备的上行链路保留。如果第一终端设备根据测量结果确定第一终端设备发送与第二无线接入网设备有连接的中继设备，则可以确定自身到第一无线接入网设备的上行链路不保留，即第一终端设备可以通过所述中继设备和第二无线接入网设备建立上行链路。第三信息可以是上行保持(ULMaintained)信元，包含true和false两种值。也可以是当包含第三信息ULMaintained，即表示第一终端设备到第一无线接入网设备的上行链路保留，不包含ULMaintained则表示第一终端设备到第一无线接入网设备的上行链路不保留。
S802、第一终端设备向第一无线接入网设备发送第三信息。
需要说明的是，第一终端设备可以将第三信息包含在RRC消息中，通过第二终端设备将第三信息转发给第一无线接入网设备。或者，第一终端设备可以将第三信息包含在第一终端设备和第二终端设备之间的协议层的包头内，例如PC5口的RLC层、MAC层、PHY层或新增适配层。第二终端设备接收到第三信息后，在第二终端设备和第一无线接入网设备之间的Uu协议层内增加第三信息，还可以携带第一终端设备的标识，以便第一无线接入网设备确定是哪个终端设备发送的第三信息。
S803、第一无线接入网设备接收第一终端设备发送的第三信息。执行S604a或S604b及以后步骤。
需要说明的是，物理上行控制信道(Physical Uplink Control Channel，PUCCH)包含调度请求(scheduling request，SR)、混合自动重传确认(hybird automatic repeat request acknowledgement，HARQ ACK)、HARQ否定确定(non-acknowledgement，NACK)以及信道状态标识(channel status indicator，CSI)。其中，SR是向第一无线接入网设备请求上行资源。当第一终端设备的上行链路保留在第一无线接入网设备时，第一无线接入网设备接收到SR之后，不需要进一步转发给第二无线接入网设备。HARQ ACK或HARQ NACK是针对下行链路的反馈的，因此，第一无线接入网设备需要反馈给第二无线接入网设备。在第二种可实现方式中，第一终端设备在向第一无线接入网设备反馈HARQ ACK或HARQ NACK时，需要增加一些的信息，例如，HARQ进程标识，冗余版本(redundancy version，RV)版本等。第一无线接入网设备将第一终端设备的标识、HARQ ACK或HARQ NACK、HARQ进程标识和RV版本等反馈给第二无线接入网设备。
可选的，除了上述第一终端设备自己搜索中继设备之外，第一终端设备还可以向 第一无线接入网设备发送指示信息和第一终端设备的标识，其中，指示信息用于第一终端设备为需要通过中继设备转发上行数据且直接接收下行数据的终端设备。第一无线接入网设备接收到第一终端设备发送的指示信息和第一终端设备的标识，向第二无线接入网设备发送指示信息和第一终端设备的标识。第二无线接入网设备接收到第一无线接入网设备发送的指示信息和第一终端设备的标识之后，向第一无线接入网设备发送第二无线接入网设备覆盖范围内的中继设备的标识。第一无线接入网设备接收到第二无线接入网设备发送的第二无线接入网设备覆盖范围内的中继设备的标识之后，通过第二终端设备转发给第一终端设备。第一终端设备接收到第二无线接入网设备覆盖范围内的中继设备的标识之后，通过搜索可以确定一个中继设备在第二无线接入网设备覆盖范围内为第一终端设备提供中继服务。但是，也存在第一终端设备未确定到可以为第一终端设备提供中继服务的中继设备。后续如果第一终端设备还是搜索不到第二无线接入网设备提供的中继设备，第一终端设备可以参考上述第一种可实现方式或第二种可实现方式来确定为中继通信的方式。如果第一终端设备可以搜索到第二无线接入网设备提供的中继设备，则第一终端设备的上行链路可以通过第二终端设备转发和第二无线接入网设备建立RRC连接。
以第一终端设备通过一个第二终端设备与第一无线接入网设备相互通信为例，第一终端设备、第二终端设备、第一无线接入网设备之间可以建立如图9所示的用户面协议栈，如图9所示，第一终端设备中可以包括分组数据汇聚协议(packet data convergence protocol，PDCP)层、RLC层、MAC层和PHY层。第二终端设备中可以包括RLC层1、MAC层1和PHY层1，还可以包括RLC层2、MAC层2和PHY层2。第一无线接入网设备中可以包括PDCP层、RLC层、MAC层和PHY层。示例性的，第一终端设备的PDCP层和第一无线接入网设备的PDCP层对等，采用第一终端设备和第一无线接入网设备间的无线通信接口技术，例如LTE空口或NR空口技术。第一终端设备的RLC层、MAC层、PHY层和第二终端设备的RLC层1、MAC层1、PHY1层对等，这些协议层之间采用第一终端设备和第二终端设备间的无线通信接口技术，例如PC5口或侧链路的空口技术。第二终端设备的RLC层2、MAC层2、PHY层2和第一无线接入网设备的RLC层、MAC层、PHY层对等，这些协议层之间采用第二终端设备和第一无线接入网设备间的无线通信接口技术。除这些协议层之外，如图9所示，第二终端设备和第一无线接入网设备中还可以包括适配层(adapation)。示例性的，适配层可以为本申请实施例新增的协议层。第二终端设备中的适配层与第一无线接入网设备中的适配层对等，二者之间采用第二终端设备和第一无线接入网设备间的无线通信接口技术。
PDCP层：主要对来自控制面的RRC消息和来自数据面的IP包进行处理，其功能包括：头部压缩和解压缩、加密/解密、完整性保护、传输用户数据和控制面数据、重排序和重传处理等。
适配层：主要负责携带第一终端设备的标识，第一终端设备和第二终端设备在侧链路的逻辑信道标识，或者第一终端设备的信令无线承载或者数据无线承载标识。
RLC层：主要负责分段/级联和重组RLC业务数据单元(service data unit，SDU)、通过自动重传请求(automatic repeat request，ARQ)来进行纠错、对RLC协议数据单 元(protocol data unit，PDU)进行重排序、重复包检测、对RLC PDU进行重分段等。
MAC层：主要负责匹配逻辑信道和传输信道、将属于一个或不同的逻辑信道的多个MAC SDU复用到同一个MAC PDU上，并发往PHY层、通过HARQ来进行纠错、调度处理、逻辑信道优先级处理、调度信息上报、随机接入过程处理等。
PHY层：为传输数据所需要的物理链路创建、维持、拆除，而提供具有机械的，电子的，功能的和规范的特性。简单的说，PHY层确保原始的数据可在各种物理媒体上传输。
下面对第一终端设备、第二终端设备与第一无线接入网设备间传输数据的过程进行简单介绍。
第一终端设备还可以包括应用层，在应用层生成第一数据，第一数据可以包括数据包头和载荷(payload)。第一终端设备可以将第一数据经过第一终端设备的PDCP层、RLC层、MAC层、PHY层处理后，通过第一终端设备与第二终端设备间的第一通道向第二终端设备发送。第一通道可以包括一个或多个逻辑信道(logic channel，LCH)。每个逻辑信道对应一个标识(identity，ID)，逻辑信道的标识(logic channel identity，LCID)可以用于标识逻辑信道，逻辑信道的标识可以为逻辑信道的索引号等。例如，假设第一终端设备为UE1，第二终端设备为UE2，UE1与UE2间的第一通道包括5个LC，则这5个LC对应的标识可以为LCID1、LCID2、LCID3、LCID4和LCID5。
可选的，为了使经过第一终端设备的PDCP层、RLC层、MAC层、PHY层处理后的第一数据适合在第一通道发送，第一终端设备的RLC层、MAC层、PHY层协议栈的具体格式由第一终端设备与第二终端设备间的无线通信接口协议规定。经过PDCP层处理后的第一数据可以称为PDCP协议数据单元(protocol data unit，PDU)，经过RLC层处理后的第一数据可以称为RLC PDU，经过MAC层处理后的数据可以称为MAC PDU。
第一数据经过不同协议层处理后包括的载荷不变，而数据包头经过不同协议层后包括的信息可能是不同的。如：第一数据经过PDCP层处理后，数据包头中可以包括PDCP序列号；后续，当第一数据经过MAC层处理后，数据包头中除包括PDCP序列号外，还可以包括LCID以及源地址(source address)字段和目的地址(target address)等，源地址字段中可以包括第一终端设备的标识，目的地址字段中可以包括第二终端设备的标识。示例性的，第一数据的数据包头中包括的LCID可以用于标识传输第一数据的逻辑信道。第一终端设备的标识可以用于标识第一终端设备，第二终端设备的标识可以用于标识第二终端设备。在本申请实施例中，第一终端设备的标识可以为第一终端设备在第一通道上的标识，例如第一终端设备在PC5口或侧链路的标识。第二终端设备的标识可以为第二终端设备在第一通道上的标识，例如第二终端设备在PC5口或侧链路的标识。
第二终端设备中与第一终端设备对等的PHY层、MAC层、RLC层可以如图9所示，为第二终端设备中与第一终端设备的PHY层、MAC层、RLC层端对端连接的PHY层1、MAC层1、RLC层1。具体的，第一数据经过第二终端设备中与第一终端设备对等的PHY、MAC层、RLC层处理的过程可参照现有技术，本申请实施例对此不予赘述。
在第二终端设备与第一无线接入网设备之间未建立第二通道的情况下，第二终端设备可以通过第二终端设备与其他中继设备(如：第三终端设备)间的直连通道，向其他中继设备发送第二数据，由其他中继设备向第一无线接入网设备发送第二数据。第二通道为第二终端设备与无线接入网设备之间的无线通信接口，第二通道可以为LTE制式的空口(简称LTE空口)，如：Uu口，或者NR制式的空口(简称NR空口)，如：Nu口等。
若第二终端设备与第一无线接入网设备之间建立有第二通道，第二终端设备可以通过与第一无线接入网设备之间建立的第二通道传输第二数据。
一种可能的设计中，第二终端设备通过第二终端设备与第一无线接入网设备之间的数据无线承载(data radion barrier，DRB)向第一无线接入网设备发送第二数据。例如，第二终端设备可以将第二数据经过第二终端设备中与第一无线接入网设备对等的RLC层、MAC层、PHY层处理后，通过第二终端设备与第一无线接入网设备之间的数据无线承载(data radion barrier，DRB)向第一无线接入网设备发送第二数据。示例性的，第二终端设备中与第一无线接入网设备对等的RLC层、MAC层、PHY层可以如图9所示，为第二终端设备中与第一无线接入网设备的PHY层、MAC层、RLC层端对端连接的PHY层2、MAC层2、RLC层2。
又一种可能的设计中，第二终端设备将第二数据经过第二终端设备中与第一无线接入网设备对等的RLC层、MAC层、PHY层处理后，通过第二终端设备与无线接入网设备之间的信令无线承载(signal radio barrier，SRB)向第一无线接入网设备发送第二数据。
除现有的RLC层、MAC层、PHY层外，第一终端设备中还可以增加新的协议层(或称为适配层)，该新增的协议层主要负责是第一无线接入网设备确定接收到达数据是哪个终端设备的哪个DRB。例如，第一终端设备的多个DRB可能通过一个第二终端设备的一个DRB传输，或者多个第一终端设备的多个DRB通过一个第二终端设备的一个DRB传输。第一终端设备的标识和DRB标识可以在数据包头和载荷经过新增的协议层处理时包括在第二数据中，例如包括在适配层包头中。例如第一终端设备的标识，以及第一终端设备和第二终端设备的逻辑信道的标识可以在数据包头和载荷经过新增的协议层处理时包括在第二数据中，例如包括在适配层包头中。在本文中，第二终端设备的逻辑信道的标识可以是指第二终端设备在侧链路上的逻辑信道的标识。示例性的，新增的协议层可以部署在PDCP层与RLC层之间，或者，部署在RLC层与MAC之间，不予限制。可选的，当第一终端设备的标识和DRB标识经新增的协议层处理后包括在第二数据中时，第二数据还可以包括新增协议层指示，该新增协议层指示可以包括在RLC PDU中或者MAC PDU或者PHY PDU中，例如在RLC包头或MAC包头或PHY层包头中包括新增协议层指示，以指示存在新增协议层，以便第一无线接入网设备根据新增协议层指示确定将接收的第二数据交由第一无线接入网设备的新增协议层进行处理。示例性的，第二终端设备的新增协议层与第一无线接入网设备的新增协议层对等(即具有对应关系)。
第一无线接入网设备可以通过DRB接收第二终端设备发送的第二数据，则第一无线接入网设备接收到第二数据后，可以将接收到的第二数据经过第一无线接入网设备 的PHY层、MAC层、RLC层、适配层处理，获得第一终端设备的标识和DRB标识，根据第一终端设备的标识和DRB标识确定接收到的数据为第一终端设备的DRB发出的数据，将数据发送至第一无线接入网设备侧和第一终端设备的所述DRB对应的PDCP层进行处理，得到载荷。或者第一无线接入网设备获得第一终端设备的标识，以及第一终端设备和第二终端设备的逻辑信道的标识，然后根据自身保存的第一终端设备和第二终端设备的逻辑信道的标识和第一终端设备的DRB标识的映射关系，找到对应的第一终端设备的DRB标识，将数据发送至第一无线接入网设备侧和第一终端设备的所述DRB对应的PDCP层进行处理，得到载荷。示例性的，本申请各实施例中，将载荷发送至第一无线接入网设备的PDCP层进行处理可参照现有技术，不再赘述。
如果第一终端设备设备或第一无线接入网设备确定由第二终端设备设备在目标小区为第一终端设备设备提供中继服务，或者，第一终端设备可以确定第二无线接入网设备覆盖范围内的中继设备为第一终端设备设备提供中继服务，第一终端设备设备可以参考上述图9所示的协议栈根据现有技术与第二无线接入网设备传输上行数据。
如果第一终端设备或第一无线接入网设备确定第一终端设备到第一无线接入网设备的上行链路保留，即第一终端设备通过第二终端设备、第一无线接入网设备和第二无线接入网设备与目标小区进行通信。第一终端设备设备可以参考图10所示的协议栈与第二无线接入网设备传输上行数据。
其中，第一终端设备、第二终端设备的传输过程可以参考上述阐述，这里不予赘述。第二终端设备中与第一无线接入网设备对等的适配层、RLC层、MAC层、PHY层可以如图10所示，为第二终端设备中与第一无线接入网设备的PHY层1、MAC层1、RLC层1、适配层端对端连接的PHY层2、MAC层2、RLC层2和适配层。第一终端设备的PDCP层和第二无线接入网设备的PDCP层对应，采用第一终端设备和第二无线接入网设备间的无线通信接口技术，例如LTE空口或NR空口技术。第一无线接入网设备接收第二终端设备转发第二数据，经过适配层处理后获取第一终端设备的标识和DRB标识或者第一终端设备和第二终端设备的逻辑信道的标识。假设第一无线接入网设备和第二无线接入网设备事先为第一终端的每个DRB建立了对应的GTP-U隧道。则第一无线接入网设备将经过处理从适配层头获取第一终端设备的标识(例如第一终端设备在侧链路的标识，或者第一无线接入网设备为第一终端设备分配的标识例如C-RNTI，或局部标识local ID等)，以及第一终端设备和第二终端设备在侧链路的逻辑信道标识，同时获取的第一终端设备发送的载荷，通过第一无线接入网设备和第二无线接入网设备的接口发送给第二无线接入网设备。例如第一无线接入网设备根据第一终端设备的标识，以及第一终端设备和第二终端设备在侧链路的逻辑信道标识，以及自身保存的第一终端设备和第二终端设备在侧链路的逻辑信道标识与第一终端的数据无线承载DRB的映射关系，确定所述载荷对应的第一终端设备的DRB标识。或者，第一无线接入网设备经过处理从适配层头获取第一终端设备的标识，以及第一终端设备的数据无线承载的标识，从而确定所述载荷对应的第一终端设备的DRB标识。接着第一无线接入网设备将载荷封装为第三数据通过和第一终端设备的DRB对应的X2接口或Xn接口的用户面GTP-U隧道发送给第二无线接入网设备。如图10所示，第一无线接入网设备中还可以包括L1层、L2层、用户数据报协议(user datagram  protocol，UDP)/IP层。第二无线接入网设备中可以包括L1层、L2层、UDP/IP层。其中，L1层包括PHY层，L2层包括MAC层。示例性的，第一无线接入网设备的L1层和第二无线接入网设备的L1层对等，二者之间采用第一无线接入网设备和第二无线接入网设备间的无线通信接口技术，例如有线接口技术。第一无线接入网设备的L2层、UDP/IP层和第二无线接入网设备的L2层、UDP/IP层对等，这些协议层之间采用第一无线接入网设备和第二无线接入网设备间的有线通信接口技术。除这些协议层之外，如图10所示，第一无线接入网设备和第二无线接入网设备中还可以包括GTP-U隧道。GTP-U隧道用于第一无线接入网设备将第三数据传输给第二无线接入网设备。第二数据在经过GTP-U隧道处理时，增加第一无线接入网设备的GTP-U隧道端点标识和第二无线接入网设备的GTP-U隧道端点标识，第三数据包括第一无线接入网设备的GTP-U隧道端点标识和/或第二无线接入网设备的GTP-U隧道端点标识。第二无线接入网设备接收到第三数据后，可以将接收到的第三数据经过第二无线接入网设备的L1层、L2层、UDP/IP、GTP-U层处理，第二无线接入网设备根据所述GTP-U隧道端点标识，以及GTP-U隧道端点标识和第一终端设备以及DRB的映射关系，确定第一终端设备标识以及DRB标识。由于PDCP层包括多个PDCP实体，每个PDCP实体对应一个DRB或逻辑信道，从而，第二无线接入网设备可以将数据发送至第一无线接入网设备侧和第一终端设备的DRB对应的PDCP层进行处理，得到载荷。示例性的，本申请各实施例中，将载荷发送至第一无线接入网设备的PDCP层进行处理可参照现有技术，不再赘述。
在另一种可实现方式中，如图11所示，也可以将适配层分别部署在第二终端设备和第二无线接入网设备上。第二无线接入网设备接收到第二数据后，可以将接收到的第二数据经过第二无线接入网设备的L1层、L2层、UDP/IP、GTP-U层处理后，得到与第二终端设备对等的适配层头以及与第一终端设备对等的第一载荷，适配层头包括第一终端设备的标识和第一终端设备与第二无线接入网设备对等的数据无线承载的标识，或者，适配层头包括第一终端设备的标识和第一终端设备与第二终端设备的逻辑信道的标识。由于PDCP层包括多个PDCP实体，每个PDCP实体对应一个DRB或逻辑信道，因此，第二无线接入网设备可以根据第一终端设备的标识和第一终端设备与第二无线接入网设备对等的数据无线承载的标识确定在第二无线接入网设备上与第一终端设备的数据无线承载标识对应的PDCP层实体，或者，根据第一终端设备的标识和第一终端设备与第二终端设备的逻辑信道的标识确定在第二无线接入网设备上与第一终端设备的逻辑信道标识对应的PDCP层实体。示例性的，本申请各实施例中，将数据发送至第二无线接入网设备的PDCP层进行处理可参照现有技术，不再赘述。
在此之前，第一无线接入网设备和第二无线接入网设备在建立X2或Xn接口时，可以建立专为用户转发用户数据的GTP-U隧道，例如第一无线接入网设备在X2/Xn setup request消息中提供第一无线接入网设备侧的GTP-U隧道端点标识，第二无线接入网设备在X2/Xn setup response消息中提供第二无线接入网设备侧的GTP-U隧道端点标识。此时建立的GTP-U隧道是无线接入网设备粒度的。如果第一无线接入网设备和第二无线接入网分别在提供GTP-U隧道端点标识时，还提供小区标识。此时建立的GTP-U隧道是小区粒度的。如果第一无线接入网设备在给第二无线接入网设备发送切 换请求或辅基站添加请求消息时，提供GTP-U隧道端点标识。第二无线接入网设备在给第二无线接入网设备回复切换请求确认或辅基站添加请求确认消息时，提供GTP-U隧道端点标识。此时建立的GTP-U隧道是UE粒度的。
上述本申请提供的实施例中，分别从第一终端设备、第一无线接入网设备和第二无线接入网设备、以及第一终端设备、第一无线接入网设备和第二无线接入网设备之间交互的角度对本申请实施例提供的方法进行了介绍。可以理解的是，各个网元，例如第一终端设备、第一无线接入网设备和第二无线接入网设备为了实现上述本申请实施例提供的方法中的各功能，第一终端设备、第一无线接入网设备和第二无线接入网设备包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，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。
本申请实施例可以根据上述方法示例对第一终端设备、第一无线接入网设备进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，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。
在采用对应各个功能划分各个功能模块的情况下，图12示出了上述和实施例中涉及的中继通信装置的一种可能的组成示意图，该中继通信装置能执行本申请各方法实施例中任一方法实施例中第一无线接入网设备、第一终端设备所执行的步骤。若所述中继通信装置为第一无线接入网设备或支持第一无线接入网设备实现实施例中提供的方法的通信装置，例如该通信装置可以是芯片系统。如图12所示，该中继通信装置可以包括：接收单元1201、发送单元1202和处理单元1203。
其中，接收单元1201，用于支持中继通信装置执行本申请实施例中描述的方法。例如，接收单元1201，用于执行或用于支持中继通信装置执行图3所示的参数配置方法中的S302，图4所示的参数配置方法中的S302和S402，图5所示的参数配置方法中的S302、S402和S503，图6所示的参数配置方法中的S602，图7所示的参数配置方法中的S602和S702，图8所示的参数配置方法中的S602、S702和S803。
在本申请实施例中，进一步的，如图12所示，该中继通信装置还可以包括：处理单元1203。
处理单元1203，用于执行或用于支持中继通信装置执行图3所示的参数配置方法中的S303，图4所示的参数配置方法中的S303，图6所示的参数配置方法中的S603，图7所示的参数配置方法中的S603。
若所述中继通信装置为第一终端设备或支持第一终端设备实现实施例中提供的方法的通信装置，例如该通信装置可以是芯片系统。
其中，发送单元1202，用于支持中继通信装置执行本申请实施例中描述的方法。例如，发送单元1202，用于执行或用于支持中继通信装置执行图3所示的参数配置方 法中的S301，图4所示的参数配置方法中的S301，图5所示的参数配置方法中的S301和S502，图6所示的参数配置方法中的S601，图7所示的参数配置方法中的S601，图8所示的参数配置方法中的S601和S802。
处理单元1203，用于执行或用于支持中继通信装置执行图5所示的参数配置方法中的S501，图8所示的参数配置方法中的S801。
接收单元1201，用于执行或用于支持中继通信装置执行图4所示的参数配置方法中的S404，图5所示的参数配置方法中的S404，图7所示的参数配置方法中的S704，图8所示的参数配置方法中的S704。
需要说明的是，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
本申请实施例提供的中继通信装置，用于执行上述任意实施例的方法，因此可以达到与上述实施例的方法相同的效果。
如图13所示为本申请实施例提供的通信装置1300，用于实现上述方法中第一无线接入网设备的功能。该通信装置1300可以是第一无线接入网设备，也可以是第一无线接入网设备中的装置。其中，该通信装置1300可以为芯片系统。本申请实施例中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。或者，通信装置1300用于实现上述方法中第一终端设备的功能。该通信装置1300可以是第一终端设备，也可以是第一终端设备中的装置。其中，该通信装置1300可以为芯片系统。本申请实施例中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
通信装置1300包括至少一个处理器1301，用于实现本申请实施例提供的方法中第一无线接入网设备或第一终端设备的功能。示例性地，若通信装置为第一无线接入网设备，处理器1301可以用于根据第一信息确定在目标小区为第一终端设备提供中继服务的第二终端设备或者根据第一信息确定第一终端设备到第一无线接入网设备的上行链路是否保留。若通信装置为第一终端设备，处理器1301可以用于根据第一信息确定第二信息，第二信息用于指示在目标小区为第一终端设备提供中继服务的第二终端设备或者第二信息用于指示第一终端设备到第一无线接入网设备的上行链路是否保留等等，具体参见方法示例中的详细描述，此处不做赘述。
通信装置1300还可以包括至少一个存储器1302，用于存储程序指令和/或数据。存储器1302和处理器1301耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理器1301可能和存储器1302协同操作。处理器1301可能执行存储器1302中存储的程序指令。所述至少一个存储器中的至少一个可以包括于处理器中。
通信装置1300还可以包括通信接口1303，用于通过传输介质和其它设备进行通信，从而用于通信装置1300中的装置可以和其它设备进行通信。示例性地，若通信装置为网络设备，该其它设备为终端设备。若通信装置为终端设备，该其它设备为网络设备。处理器1301利用通信接口1303收发数据，并用于实现图3～图8对应的实施例中所述的第一无线接入网设备或第一终端设备所执行的方法。
本申请实施例中不限定上述通信接口1303、处理器1301以及存储器1302之间的具体连接介质。本申请实施例在图13中以通信接口1303、处理器1301以及存储器1302 之间通过总线1304连接，总线在图13中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不引以为限。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图13中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
在本申请实施例中，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列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处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
在本申请实施例中，存储器可以是非易失性存储器，比如硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)等，还可以是易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)。存储器是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。本申请实施例中的存储器还可以是电路或者其它任意能够实现存储功能的装置，用于存储程序指令和/或数据。
通过以上的实施方式的描述，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，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。
在本申请所提供的几个实施例中，应该理解到，所揭露的装置和方法，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，所述模块或单元的划分，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装置，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一个物理单元或多个物理单元，即可以位于一个地方，或者也可以分布到多个不同地方。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。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
本申请实施例提供的方法中，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程序指令时，全部或部分地产生按照本发明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、网络设备、终端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可以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，数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，SSD)等。

Claims (31)

  1. 一种中继通信方法，其特征在于，包括：
    第一无线接入网设备接收第一终端设备发送的第一信息，所述第一信息用于指示所述第一终端设备为上行功率受限的终端设备；
    所述第一无线接入网设备向第二无线接入网设备发送第二信息，所述第二信息用于指示在目标小区为所述第一终端设备提供中继服务的第二终端设备，所述第二无线接入网设备为所述第一终端设备需要连接的所述目标小区所属的无线接入网设备。
  2. 根据权利要求1所述的方法，其特征在于，在所述第一无线接入网设备接收第一终端设备发送的第一信息之后，所述方法还包括：
    所述第一无线接入网设备根据所述第一信息确定在所述目标小区为所述第一终端设备提供中继服务的所述第二终端设备。
  3. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述第一无线接入网设备接收所述第一终端设备发送的第三信息，所述第三信息用于指示在所述目标小区为所述第一终端设备提供中继服务的所述第二终端设备。
  4. 根据权利要求1-3中任一项所述的方法，其特征在于，所述第二信息包括所述第一终端设备的标识和所述第二终端设备的标识，或者所述第二信息包括所述第二终端设备的标识。
  5. 根据权利要求1-3中任一项所述的方法，其特征在于，所述第二信息包括第四信息，所述第四信息用于指示所述第二终端设备在所述目标小区为所述第一终端设备提供中继服务。
  6. 根据权利要求1-5中任一项所述的方法，其特征在于，在所述第一无线接入网设备向第二无线接入网设备发送第二信息之后，所述方法还包括：
    所述第一无线接入网设备接收所述第二无线接入网设备发送的第五信息和第六信息，所述第五信息包括目标小区标识和为所述第一终端设备分配的第一小区无线网络临时标识C-RNTI，所述第六信息包括目标小区标识、为所述第二终端设备分配的第二C-RNTI和随机接入资源；
    所述第一无线接入网设备向所述第一终端设备发送所述第五信息，向所述第二终端设备发送所述第六信息。
  7. 根据权利要求6所述的方法，其特征在于，所述第五信息和所述第六信息被封装在由所述第二无线接入网设备发送给所述第一无线接入网设备的同一条接口消息中。
  8. 一种中继通信方法，其特征在于，包括：
    第一终端设备向第一无线接入网设备发送第一信息，所述第一信息用于指示所述第一终端设备为上行功率受限的终端设备；
    所述第一终端设备根据所述第一信息确定第二信息，所述第二信息用于指示在目标小区为所述第一终端设备提供中继服务的第二终端设备；
    所述第一终端设备向所述第一无线接入网设备发送所述第二信息。
  9. 根据权利要求8所述的方法，其特征在于，所述方法还包括：
    所述第一终端设备接收第三信息，所述第三信息包括目标小区标识和为所述第一终端设备分配的第一小区无线网络临时标识C-RNTI；
    所述第一终端设备根据所述第三信息通过所述第二终端设备与第二无线接入网设备的所述目标小区通信。
  10. 一种中继通信方法，其特征在于，包括：
    第一无线接入网设备接收第一终端设备发送的第一信息，所述第一信息用于指示所述第一终端设备为上行功率受限的终端设备；
    所述第一无线接入网设备向第二无线接入网设备发送第二信息，所述第二信息用于指示所述第二无线接入网设备不需要为所述第一终端设备在目标小区分配随机接入资源，所述第二无线接入网设备为所述第一终端设备需要连接的所述目标小区所属的无线接入网设备。
  11. 根据权利要求10所述的方法，其特征在于，在所述第一无线接入网设备接收第一终端设备发送的第一信息之后，所述方法还包括：
    所述第一无线接入网设备根据所述第一信息确定所述第一终端设备到所述第一无线接入网设备的上行链路是否保留。
  12. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    在所述第一终端设备需要连接到所述第二无线接入网设备的目标小区的情况下，所述第一无线接入网设备接收所述第一终端设备发送的第三信息，所述第三信息用于指示所述第一终端设备到所述第一无线接入网设备的上行链路是否保留。
  13. 根据权利要求10-12中任一项所述的方法，其特征在于，在所述第一无线接入网设备接收第一终端设备发送的第一信息之后，所述方法还包括：
    所述第一无线接入网设备向第二无线接入网设备发送所述第一终端设备的标识。
  14. 根据权利要求10-13中任一项所述的方法，其特征在于，在所述第一无线接入网设备向第二无线接入网设备发送第二信息之后，所述方法还包括：
    所述第一无线接入网设备接收所述第二无线接入网设备发送的第四信息，所述第四信息包括目标小区标识和为所述第一终端设备分配的第一小区无线网络临时标识C-RNTI；
    所述第一无线接入网设备向所述第一终端设备发送所述第四信息。
  15. 一种中继通信方法，其特征在于，包括：
    第一终端设备向第一无线接入网设备发送第一信息，所述第一信息用于指示所述第一终端设备为上行功率受限的终端设备；
    所述第一终端设备根据所述第一信息确定第二信息，所述第二信息用于指示所述第一终端设备到所述第一无线接入网设备的上行链路是否保留；
    所述第一终端设备向所述第一无线接入网设备发送所述第二信息。
  16. 根据权利要求15所述的方法，其特征在于，所述方法还包括：
    所述第一终端设备接收第三信息，所述第三信息包括目标小区标识和为所述第一终端设备分配的第一小区无线网络临时标识C-RNTI；
    所述第一终端设备根据所述第三信息通过第二终端设备与第二无线接入网设备的所述目标小区通信。
  17. 一种中继通信方法，其特征在于，包括：
    第二无线接入网设备接收与第二终端设备对等的适配层头，以及与第一终端设备 对等的第一载荷，所述适配层头包括所述第一终端设备的标识和所述第一终端设备与所述第二无线接入网设备对等的数据无线承载的标识，或者，所述适配层头包括所述第一终端设备的标识和所述第一终端设备与所述第二终端设备的逻辑信道的标识；
    所述第二无线接入网设备根据所述第一终端设备的标识和所述第一终端设备与所述第二无线接入网设备对等的数据无线承载的标识确定在所述第二无线接入网设备上与所述第一终端设备的所述数据无线承载标识对应的分组数据汇聚协议PDCP层实体，或者，根据所述第一终端设备的标识和所述第一终端设备与所述第二终端设备的逻辑信道的标识确定在所述第二无线接入网设备上与所述第一终端设备的逻辑信道标识对应的PDCP层实体。
  18. 一种中继通信装置，其特征在于，包括：
    接收单元，用于接收第一终端设备发送的第一信息，所述第一信息用于指示所述第一终端设备为上行功率受限的终端设备；
    发送单元，用于向第二无线接入网设备发送第二信息，所述第二信息用于指示在目标小区为所述第一终端设备提供中继服务的第二终端设备，所述第二无线接入网设备为所述第一终端设备需要连接的所述目标小区所属的无线接入网设备。
  19. 根据权利要求18所述的装置，其特征在于，所述装置还包括：
    处理单元，用于根据所述第一信息确定在所述目标小区为所述第一终端设备提供中继服务的所述第二终端设备。
  20. 根据权利要求18所述的装置，其特征在于，
    所述接收单元，还用于接收所述第一终端设备发送的第三信息，所述第三信息用于指示在所述目标小区为所述第一终端设备提供中继服务的所述第二终端设备。
  21. 根据权利要求18-20中任一项所述的装置，其特征在于，所述第二信息包括所述第一终端设备的标识和所述第二终端设备的标识，或者所述第二信息包括所述第二终端设备的标识。
  22. 根据权利要求18-20中任一项所述的装置，其特征在于，所述第二信息包括第四信息，所述第四信息用于指示所述第二终端设备在所述目标小区为所述第一终端设备提供中继服务。
  23. 根据权利要求18-22中任一项所述的装置，其特征在于，
    所述接收单元，还用于接收所述第二无线接入网设备发送的第五信息和第六信息，所述第五信息包括目标小区标识和为所述第一终端设备分配的第一小区无线网络临时标识C-RNTI，所述第六信息包括目标小区标识、为所述第二终端设备分配的第二C-RNTI和随机接入资源；
    所述发送单元，还用于向所述第一终端设备发送所述第五信息，向所述第二终端设备发送所述第六信息。
  24. 一种中继通信装置，其特征在于，包括：
    发送单元，用于向第一无线接入网设备发送第一信息，所述第一信息用于指示第一终端设备为上行功率受限的终端设备；
    处理单元，用于根据所述第一信息确定第二信息，所述第二信息用于指示在目标小区为所述第一终端设备提供中继服务的第二终端设备；
    所述发送单元，还用于向所述第一无线接入网设备发送所述第二信息。
  25. 一种中继通信装置，其特征在于，包括：
    接收单元，用于接收第一终端设备发送的第一信息，所述第一信息用于指示所述第一终端设备为上行功率受限的终端设备；
    发送单元，用于向第二无线接入网设备发送第二信息，所述第二信息用于指示所述第二无线接入网设备不需要为所述第一终端设备在目标小区分配随机接入资源，所述第二无线接入网设备为所述第一终端设备需要连接的所述目标小区所属的无线接入网设备。
  26. 根据权利要求25所述的装置，其特征在于，所述装置还包括：
    处理单元，用于根据所述第一信息确定所述第一终端设备到第一无线接入网设备的上行链路是否保留。
  27. 根据权利要求25所述的装置，其特征在于，在所述第一终端设备需要连接到所述第二无线接入网设备的目标小区的情况下，
    所述接收单元，还用于接收所述第一终端设备发送的第三信息，所述第三信息用于指示所述第一终端设备到第一无线接入网设备的上行链路是否保留。
  28. 根据权利要求25-27中任一项所述的装置，其特征在于，
    所述发送单元，还用于向第二无线接入网设备发送所述第一终端设备的标识。
  29. 根据权利要求25-28中任一项所述的装置，其特征在于，
    所述接收单元，还用于接收所述第二无线接入网设备发送的第四信息，所述第四信息包括目标小区标识和为所述第一终端设备分配的第一小区无线网络临时标识C-RNTI；
    所述发送单元，还用于向所述第一终端设备发送所述第四信息。
  30. 一种中继通信装置，其特征在于，包括：
    发送单元，用于向第一无线接入网设备发送第一信息，所述第一信息用于指示第一终端设备为上行功率受限的终端设备；
    处理单元，用于根据所述第一信息确定第二信息，所述第二信息用于指示所述第一终端设备到所述第一无线接入网设备的上行链路是否保留；
    所述发送单元，还用于向所述第一无线接入网设备发送所述第二信息。
  31. 一种中继通信装置，其特征在于，包括：
    接收单元，用于接收与第二终端设备对等的适配层头，以及与第一终端设备对等的第一载荷，所述适配层头包括所述第一终端设备的标识和所述第一终端设备与第二无线接入网设备对等的数据无线承载的标识，或者，所述适配层头包括所述第一终端设备的标识和所述第一终端设备与所述第二终端设备的逻辑信道的标识；
    处理单元，用于根据所述第一终端设备的标识和所述第一终端设备与所述第二无线接入网设备对等的数据无线承载的标识确定在所述第二无线接入网设备上与所述第一终端设备的所述数据无线承载标识对应的分组数据汇聚协议PDCP层实体，或者，根据所述第一终端设备的标识和所述第一终端设备与所述第二终端设备的逻辑信道的标识确定在所述第二无线接入网设备上与所述第一终端设备的逻辑信道标识对应的PDCP层实体。
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