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WO2017166138A1 - 中继传输的方法和装置 - Google Patents

中继传输的方法和装置 Download PDF

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Publication number
WO2017166138A1
WO2017166138A1 PCT/CN2016/077913 CN2016077913W WO2017166138A1 WO 2017166138 A1 WO2017166138 A1 WO 2017166138A1 CN 2016077913 W CN2016077913 W CN 2016077913W WO 2017166138 A1 WO2017166138 A1 WO 2017166138A1
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WO
WIPO (PCT)
Prior art keywords
layer
terminal device
pdu
remote terminal
identifier
Prior art date
Application number
PCT/CN2016/077913
Other languages
English (en)
French (fr)
Inventor
曾元清
Original Assignee
广东欧珀移动通信有限公司
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 广东欧珀移动通信有限公司 filed Critical 广东欧珀移动通信有限公司
Priority to CN201680079192.7A priority Critical patent/CN108521851B/zh
Priority to JP2018538562A priority patent/JP6714707B2/ja
Priority to EP16895919.5A priority patent/EP3393055A4/en
Priority to KR1020187021394A priority patent/KR20180127965A/ko
Priority to US16/070,455 priority patent/US11140729B2/en
Priority to PCT/CN2016/077913 priority patent/WO2017166138A1/zh
Priority to TW106110885A priority patent/TWI729106B/zh
Publication of WO2017166138A1 publication Critical patent/WO2017166138A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0205—Traffic management, e.g. flow control or congestion control at the air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • Embodiments of the present invention relate to the field of communications and, more particularly, to methods and apparatus for relay transmission.
  • the device-to-device (D2D) technology means that adjacent terminal devices can transmit data through a direct link in a short range without forwarding through a network device.
  • D2D communication can share licensed band resources with the cellular system to form a unified hybrid cellular-D2D network.
  • some terminal devices may still operate in a cellular communication mode, that is, communicate with other terminal devices through network devices, and some terminal devices may operate in a D2D communication mode, that is, through a through link with other terminal devices. Direct data transfer with other terminal devices.
  • data transmission between the network device and the terminal device can be assisted by the D2D relay.
  • the D2D communication mode is adopted between the D2D relay and the D2D terminal, and the cellular communication mode is used between the D2D relay and the network device.
  • D2D relays receive and forward data in a half-duplex manner and perform mode conversion during reception and forwarding.
  • the D2D relays data transmission between the D2D terminal and the network device through an Internet Protocol (IP) layer (ie, layer 3), and needs to pass through layer 1 (ie, physical) for the received data packet.
  • IP Internet Protocol
  • Layer 2 layer 2 (including Media Access Control (MAC) layer, Radio Link Control (RLC) layer and Packet Data Convergence Protocol (PDCP) layer) and layer 3
  • MAC Media Access Control
  • RLC Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • the embodiments of the present invention provide a method and an apparatus for relay transmission, which can reduce the processing complexity of the relay transmission and reduce the data delay.
  • the first aspect provides a method for relay transmission, including: the relay terminal device receives a first layer 2 PDU sent by the source device to the receiver device, where the first layer 2 PDU carries the far The identification information of the terminal device, or the first Layer 2 PDU is scheduled by using the PDCCH that is scrambled by the RNTI of the remote terminal device; the relay terminal device generates the second layer 2 according to the first layer 2 PDU. a PDU; the relay terminal device sends the second layer 2 PDU to the receiver device; wherein the source device is the remote terminal device and the receiver device is a network device, or the source device is a network device The receiving device is the remote terminal device.
  • the user plane protocol stack of the relay terminal device for relay transmission may include layer 1 and layer 2, where layer 2 may include only the MAC layer, or may further include at least one of the RLC layer and the PDCP layer. layer.
  • the user plane protocol stack of the relay terminal device may not include layer three (ie, an IP layer).
  • the relay terminal device may forward the data carried in the first Layer 2 PDU to the receiving end device according to the identifier information or the RNTI of the remote terminal device.
  • the receiving end may generate a second layer 2 PDU according to the first layer 2 PDU in layer 2, for example, encapsulating the data carried in the first layer 2 PDU in layer 2, to obtain a second layer 2
  • the PDU sends the second Layer 2 PDU to the receiving device.
  • the relay terminal device may determine, according to the identifier information of the remote terminal device or the RNTI, the remote terminal device corresponding to the first layer 2 PDU, for example, identifying the identifier information of the remote terminal device at layer 2 Determining, by the remote terminal device, the data carried in the first layer 2 PDU according to the remote terminal device, for example, the relay terminal device sends the remote terminal device to the remote terminal device
  • the second layer 2 PDU sent by the receiving device carries the identifier information of the remote terminal device, or the second layer 2 PDU is sent by using the uplink transmission resource allocated by the network device for the remote terminal device.
  • the uplink transmission resource allocated by the network device to the remote terminal device may be allocated by the network device according to the preamble corresponding to the remote terminal device sent by the relay terminal device, or the network device according to the The BSR that is sent by the relay terminal device carrying the identification information of the remote terminal device is allocated.
  • the identifier information of the remote terminal device includes a layer 2 identifier of the remote terminal device or a terminal device identifier of the remote terminal device.
  • the relay terminal device may identify the identification information of the remote terminal device at layer 2.
  • the layer 2 identifier of the remote terminal device is set in one of the following layers: a MAC layer, a PDCP layer, and an RLC layer; or
  • the remote terminal device and layer 2 of the network device comprise an adaptation layer, the adaptation layer is located between the MAC layer and the PDCP layer, and the layer 2 identifier of the remote terminal device is set in the adaptation layer.
  • the layer 2 of the relay terminal device may include an adaptation layer. And determining, by the adaptation layer, the remote terminal device corresponding to the first Layer 2 PDU.
  • the layer 2 of the relay terminal device may not include the adaptation layer.
  • the relay terminal device may not identify the remote terminal device corresponding to the first layer 2 PDU in layer 2, but directly The data carried in the Layer 2 and Layer 2 PDUs is encapsulated to generate a second Layer 2 PDU.
  • the relay terminal device may carry a relay specific logical channel identifier in the second layer 2 PDU sent to the network device, so that the network device determines the second layer 2 PDU according to the relay specific logical channel identifier.
  • the Layer 2 PDU is configured to enable the remote terminal device to determine, according to the transmission resource, the second Layer 2 PDU to carry the relay data, and determine, at the adaptation layer, whether the second Layer 2 PDU is sent to itself.
  • the sending end device is the network device and the receiving end device is the remote terminal device
  • the remote terminal device identifier information
  • the layer 2 identifier of the remote terminal device is generated;
  • the relay terminal device generates the second layer 2 PDU according to the first layer 2 PDU, and the relay terminal device determines the terminal device identifier corresponding to the layer 2 identifier;
  • the relay terminal device performs encapsulation processing on the data carried in the first layer 2 PDU to generate a second layer 2 PDU, where the second layer 2 PDU carries the corresponding terminal device identifier.
  • the relay terminal device if the sending end device is the remote terminal device and the receiving end device is the network device, the relay terminal device is configured according to the Before the second layer 2 PDU is generated, the method further includes: the relay terminal device determining a preamble corresponding to the identifier information of the remote terminal device; and the relay terminal device sending the a preamble; the relay terminal device receives an uplink grant sent by the network device according to the preamble, and the uplink grant carries an uplink transmission resource allocated by the network device; the relay terminal device sends the second layer to the receiver device
  • the PDU includes: the relay terminal device sends the second layer 2 PDU to the network device by using the uplink transmission resource.
  • the sending end device is the remote terminal device and the receiving end device is a network device
  • the relay terminal device receives the receiving device before the end device sends the second layer 2 PDU
  • the method further includes: the relay end The end device sends a BSR to the network device, where the BSR carries the identification information of the remote terminal device; the relay terminal device receives the PDCCH sent by the network device according to the BSR, and the PDCCH carries the identifier of the remote terminal device.
  • the second terminal PDU is sent by the relay terminal device to the receiving device, and the relay terminal device sends the second layer 2 PDU to the network device according to the PDCCH.
  • the PDCCH may carry an uplink grant.
  • the relay terminal device may determine, according to the uplink grant in the PDCCH, an uplink transmission resource allocated by the network device to the remote terminal device, and send the second Layer 2 PDU by using the transmission resource.
  • the identifier information of the remote terminal device includes a terminal device identifier of the remote terminal device; the relay terminal device generates a second layer 2 PDU according to the first layer 2 PDU, where the relay terminal device determines a layer 2 identifier corresponding to the terminal device identifier; The relay terminal device performs encapsulation processing on the data carried in the first layer 2 PDU to generate a second layer 2 PDU, where the second layer 2 PDU carries the corresponding layer 2 identifier.
  • the D2D communication interface is specifically a communication interface between the remote terminal device and the relay terminal device.
  • the D2D communication interface may be specifically a PC5 interface; the cellular communication interface is between the relay terminal device and the network device.
  • the communication interface for example, the cellular communication interface can be a Uu interface.
  • the PDU transmitted by the cellular communication interface may also be specifically an RLC PDU or a PDCP PDU.
  • the PDU transmitted through the PC5 interface may be specifically a MAC PDU, an RLC PDU, or a PDCP PDU.
  • the PDU transmitted through the PC5 interface may be specifically a PDU of a corresponding layer 2 in the WLAN.
  • the identification information of the remote terminal device is carried in the MAC Control Element field of the MAC PDU.
  • the first layer 2 PDU carries a relay specific logical channel identifier
  • the relay terminal device generates, according to the first layer 2 PDU
  • the method further includes: determining, by the relay terminal device, that the data carried in the first layer 2 PDU needs to be forwarded according to the specific logical channel identifier of the relay.
  • the second Layer 2 PDU carries a relay specific logical channel identifier.
  • the network device determines that the data carried in the second Layer 2 PDU is forwarded by the relay terminal device according to the specific logical channel identifier of the relay.
  • the sending end device is the remote terminal device and the receiving end device is a network device
  • the first Layer 2 PDU is the far
  • the terminal device is sent by using a transmission resource for relay transmission; before the relay terminal device generates the second Layer 2 PDU according to the first Layer 2 PDU, the method further includes: the relay terminal device according to the transmission The resource determines that the data carried in the first Layer 2 PDU needs to be forwarded.
  • the relay terminal device may send the second layer 2 PDU to the remote terminal device by using the transmission resource transmitted by the relay. .
  • the remote terminal device determines that the data carried in the second Layer 2 PDU is forwarded by the relay terminal device according to the transmission resource occupied by the second Layer 2 PDU.
  • the sending end device is the network device and the receiving end device is a remote terminal device
  • the first Layer 2 PDU is a network.
  • the device is scheduled by the PDCCH that is scrambled by the relaying specific RNTI; before the relay terminal device generates the second Layer 2 PDU according to the first Layer 2 PDU, the method further includes: the relay terminal device is configured according to the scheduling The PDCCH of the PDCCH of the first Layer 2 PDU is used to determine the need to forward the data carried in the first Layer 2 PDU.
  • the first layer 2 PDU received by the relay terminal device is scheduled by the relay terminal device by relaying a PDCCH addressed by the specific RNTI.
  • the second Layer 2 PDU may carry a relay specific logical channel identifier, where the relay specific logical channel identifier may be used.
  • the network device determines that the second Layer 2 PDU is forwarded by the relay terminal device.
  • the second layer 2 PDU may not carry the identification information of the remote terminal device. interest.
  • the method further includes: the relay terminal The device receives a connection establishment request of the remote terminal device, where the connection establishment request is used to request to establish a D2D communication link between the relay terminal device and the remote terminal device; the relay terminal device establishes a request according to the connection, Sending a bearer setup request to the core network device, where the bearer setup request carries the terminal device identifier of the remote terminal device, so that the core network device and the network device establish an evolved packet system EPS bearer of the remote terminal device; the relay Receiving, by the terminal device, a bearer setup response sent by the network device, where the bearer setup response carries configuration information of the EPS bearer established by the network device for the remote terminal device, where the EPS bearer includes the network device and the relay terminal device Inter-cell data transmission channel and D2D data transmission between the relay terminal device and the remote terminal device .
  • the configuration information of the EPS bearer includes physical layer configuration information and layer 2 configuration information.
  • the configuration information of the EPS bearer may include physical layer configuration information and layer 2 configuration information, where, optionally, the layer 2 configuration information may include configuration information of a layer related to the relay transmission in layer 2, for example,
  • the layer 2 configuration information may include configuration information of a layer in the layer 2 for identifying the identity information of the remote terminal device, such as MAC layer configuration information.
  • the physical layer configuration information may include information about a transmission resource for relay transmission and/or at least one of an RNTI and a preamble allocated for the remote terminal device, for example, for relaying the terminal device and The information of the first transmission resource that is relayed between the remote terminal devices, and/or the information of the second transmission resource used for relaying the relay transmission between the terminal device and the network device.
  • the layer 2 configuration information may include a layer 2 identifier and/or a relay specific logical channel identifier allocated by the network device to the remote terminal device.
  • the method further includes: the relay terminal device sends the information of the first transmission resource and/or the layer 2 identifier to the remote terminal device.
  • the configuration information of the EPS bearer further includes at least one of the following information: PDCP layer configuration information and RLC layer configuration information;
  • the method further includes: transmitting the PDCP layer configuration information and/or the RLC layer configuration information to the remote terminal device, so that the remote terminal device performs configuration according to the PDCP layer configuration information and/or the RLC layer configuration information.
  • a method for relay transmission which includes: the sending end device performs encapsulation processing on data to be sent to the receiving end device, and generates a first Layer 2 protocol data unit PDU, where the first Layer 2 PDU is generated. Carrying the identification information of the remote terminal device, or the first Layer 2 PDU is scheduled by using the PDCCH that is scrambled by the RNTI of the remote terminal device; the transmitting device sends the first Layer 2 PDU to the relay terminal device;
  • the sending end device is the remote terminal device and the receiving end device is a network device, or the sending end device is a network device and the receiving end device is the remote terminal device.
  • the identifier information of the remote terminal device includes a terminal device identifier of the remote terminal device or a layer 2 identifier of the remote terminal device.
  • the layer 2 identifier of the remote terminal device is set in one of the following layers: a MAC layer, a PDCP layer, and an RLC layer; or
  • the layer 2 of the transmitting device includes an adaptation layer, the adaptation layer is located between the MAC layer and the PDCP layer, and the layer 2 identifier of the remote terminal device is set in the adaptation layer.
  • the sending end device is a network device
  • the first Layer 2 PDU is specifically a MAC PDU
  • the sending end device is the remote end
  • the identifier information of the remote terminal device is carried in a MAC Control Element field of the MAC PDU.
  • the first Layer 2 PDU carries a relay specific logical channel identifier, where the relay specific logical channel identifier is used by the relay terminal device to determine The data carried in the first Layer 2 PDU needs to be forwarded.
  • the sending end device if the sending end device is the remote terminal device, the sending end device sends the first Layer 2 PDU to the relay terminal device, The remote terminal device sends the first Layer 2 PDU to the relay terminal device by using a transmission resource for relay transmission.
  • the sending end device is a network device
  • the method further includes: the transmitting end device transmitting, to the relay terminal device, a PDCCH scrambled by a relay specific RNTI, where the PDCCH is used to schedule the first Layer 2 PDU, where the relay specific RNTI is used for the relay terminal
  • the device determines the data carried in the first Layer 2 PDU. To be forwarded.
  • the method further includes: the network The device receives a bearer setup request, and the bearer setup request carries the terminal device identifier of the remote terminal device; the network device establishes an EPS bearer of the remote terminal device according to the bearer setup request, where the EPS bearer includes the network device and a cellular data transmission channel between the relay terminal devices and a D2D data transmission channel between the relay terminal device and the remote terminal device.
  • the configuration information of the EPS bearer includes MAC layer configuration information and physical layer configuration information; or, the configuration information of the EPS bearer further includes a PDCP. At least one of layer configuration information and RLC layer configuration information.
  • the physical layer configuration information may include information about a transmission resource for relay transmission and/or at least one of an RNTI and a preamble allocated for the remote terminal device, for example, for relaying the terminal device and The information of the first transmission resource that is relayed between the remote terminal devices, and/or the information of the second transmission resource used for relaying the relay transmission between the terminal device and the network device.
  • the layer 2 configuration information may include a layer 2 identifier and/or a relay specific logical channel identifier allocated by the network device to the remote terminal device.
  • a method for relay transmission including: receiving, by a receiving end device, a second layer 2 protocol data unit PDU sent by a relay terminal device, where the second layer 2 PDU is sent by the relay terminal device according to the second Generated by the first layer 2 PDU sent by the end device, the first layer 2 PDU carries the identifier information of the remote terminal device, or the first layer 2 PDU is scheduled by using the RNTI of the remote terminal device to perform scrambling.
  • the receiving end device determines the remote terminal device corresponding to the second layer 2 PDU; wherein the sending end device is the remote terminal device and the receiving end device is a network device, or the sending end device is a network device and The receiving device is the remote terminal device.
  • the identifier information of the remote terminal device includes: a terminal device identifier of the remote terminal device or a layer 2 identifier of the remote terminal device.
  • the layer 2 identifier of the remote terminal device is set in one of the following layers: a MAC layer, a PDCP layer, and an RLC layer; or
  • the transmitting device and the layer 2 of the receiving device include an adaptation layer, where the adaptation layer is located The MAC layer and the PDCP layer are located, and the layer 2 identifier of the remote terminal device is set at the adaptation layer.
  • the second Layer 2 PDU carries the terminal device identifier of the remote terminal device; Determining, by the receiving end device, the remote terminal device corresponding to the second layer 2 PDU, the determining, by the receiving end device, determining the far distance corresponding to the second layer 2 PDU according to the terminal device identifier carried in the second layer 2 PDU Terminal equipment.
  • the method further includes: the network device receiving a preamble corresponding to the remote terminal device sent by the relay terminal device; the network device sending an uplink authorization to the relay terminal device according to the preamble, where the uplink authorization carries the network The uplink transmission resource allocated by the device; the receiving device receives the second layer 2 PDU sent by the relay terminal device, where the network device receives the second layer 2 PDU sent by the relay terminal device by using the uplink transmission resource; Determining the remote terminal device corresponding to the second layer 2 PDU, the terminal device determining, by the relay terminal device, the remote end corresponding to the second layer 2 PDU according to the uplink transmission resource occupied by the second layer 2 PDU Terminal Equipment.
  • the receiving end device is a network device, before the receiving end device receives the second Layer 2 PDU sent by the relay terminal device, The method further includes: the network device receiving the BSR sent by the relay terminal device, where the BSR carries the identification information of the remote terminal device; the network device sends a PDCCH to the relay terminal device according to the BSR, the PDCCH Carrying the identification information of the remote terminal device; the receiving end device determining the remote terminal device corresponding to the second layer 2 PDU, comprising: the receiving end device determining the PDCCH according to the PDCCH for scheduling the second layer 2 PDU The remote terminal device corresponding to the second layer 2 PDU.
  • the identifier information of the remote terminal device includes the terminal device identifier of the remote terminal device
  • the second layer 2 PDU carries the layer 2 identifier of the remote terminal device
  • the receiving end device determines the remote terminal device corresponding to the second layer 2 PDU, including: the receiving end device is carried according to the second layer 2 PDU
  • the layer 2 identifier determines the remote terminal device corresponding to the second layer 2 PDU.
  • the second Layer 2 PDU may carry a relay specific logical channel identifier.
  • the network device may determine, according to the relay specific logical channel identifier, that the second Layer 2 PDU is forwarded by the relay terminal device.
  • an apparatus for relay transmission for performing the method of any of the first aspect or the first aspect of the first aspect.
  • the apparatus comprises means for performing the method of any of the above-described first aspect or any of the possible implementations of the first aspect.
  • the apparatus comprises means for performing the method of any of the above-described second aspect or any of the possible implementations of the second aspect.
  • the apparatus comprises means for performing the method of any of the possible implementations of the third aspect or the third aspect described above.
  • another apparatus for relay transmission comprising: a storage unit for storing instructions, the processor for executing instructions stored by the memory, and when the processor executes the memory
  • the execution of the instructions causes the processor to perform the method of the first aspect or any of the possible implementations of the first aspect.
  • another apparatus for relay transmission comprising: a storage unit for storing instructions for executing instructions stored in the memory, and a processor for executing the memory
  • the execution of the instructions causes the processor to perform the method of the second aspect or any of the possible implementations of the second aspect.
  • another apparatus for relay transmission comprising: a storage unit for storing instructions, the processor for executing instructions stored by the memory, and when the processor executes the memory
  • the execution of the instructions causes the processor to perform the method of any of the possible implementations of the third aspect or the third aspect.
  • a tenth aspect a computer readable medium for storing a computer program, the computer program comprising instructions for performing the method of the first aspect or any of the possible implementations of the first aspect.
  • a twelfth aspect there is provided another computer readable medium for storing a computer program,
  • the computer program includes instructions for performing the method of any of the third aspect or any of the possible implementations of the third aspect.
  • a thirteenth aspect provides a system for relay transmission, where the system includes a relay terminal device, a remote terminal device, and a network device, wherein the user plane protocol stack of the relay terminal device may include layer 1 and layer 2
  • the user plane protocol stack of the remote terminal device may include layer 1, layer 2, and layer 3.
  • the user plane protocol stack of the network device may include layer 1, layer 2, and layer 3, where the layer of the relay terminal device Layer 1 of the remote terminal device and layer 1 of the network device are respectively peer layers, and layer 2 of the relay terminal device is respectively paired with layer 2 of the remote terminal device and layer 2 of the network device
  • the layer is equal to the layer, and the remote terminal device, the relay terminal device, and the network device can perform relay transmission in a manner of Layer 2 PDUs.
  • the user plane protocol stack of the relay terminal device may only include layer one and layer two, and does not include layer three, and layer two of the relay terminal device is used to identify the remote terminal device for relay transmission.
  • layer 2 of the relay terminal device may be used to identify and encapsulate the remote terminal device identifier, where the remote terminal device identifier may be specifically the identifier information of the remote terminal device, such as the remote terminal device. Terminal device identification or layer 2 identification.
  • the remote terminal device and the layer 2 of the network device may include an adaptation layer, where the adaptation layer may be used to identify the remote terminal device identifier.
  • the adaptation layer may be located between the MAC layer and the PDCP layer.
  • the relay terminal device may be the device in any possible implementation manner of the fourth aspect or the fourth aspect, where the remote terminal device and the sender device in the network device may be the fifth aspect or the fifth aspect
  • the remote terminal device and the receiving device in the network device may be the device in any possible implementation manner of the sixth aspect or the sixth aspect.
  • the relay terminal device may be the device in any possible implementation manner of the seventh aspect or the seventh aspect, where the remote terminal device and the sender device in the network device may be the eighth aspect or the eighth aspect
  • the device in any possible implementation, the remote terminal device and the receiving device in the network device may be the device in any possible implementation manner of the ninth aspect or the ninth aspect.
  • the method and apparatus for relay transmission relays data between the remote terminal device and the network device by using a layer two relay manner by the relay terminal device, wherein the remote terminal
  • the Layer 2 PDU sent by the device or the network device to the relay terminal device carries the identifier information of the remote terminal device, or the network device scrambles the PDCCH for scheduling the Layer 2 PDU by using the RNTI of the remote terminal device, where Following the terminal device can be based on the remote end
  • the identifier information of the end device or the RNTI determines the remote terminal device corresponding to the Layer 2 PDU, and forwards the data carried in the Layer 2 PDU, and the relay terminal device adopts a layer three relay manner in the prior art.
  • the processing complexity of the relay terminal device can be reduced, the transmission delay of the relay data can be reduced, and the overall performance of the system can be improved.
  • FIG. 1 is a schematic flowchart of a wireless communication system to which an embodiment of the present invention is applied.
  • 2a is a schematic diagram of an example of a user plane protocol stack for relay communication of various devices according to an embodiment of the present invention.
  • 2b is a schematic diagram of another user plane protocol stack example for relay communication of various devices in accordance with an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a method for relay transmission according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an example of a structure of a MAC PDU in a method for relay transmission according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of another method for relay transmission according to an embodiment of the present invention.
  • FIG. 6 is a schematic flowchart of another method for relay transmission according to an embodiment of the present invention.
  • FIG. 7 is a schematic flowchart of another method for relay transmission according to an embodiment of the present invention.
  • FIG. 8 is a schematic flowchart of another method for relay transmission according to an embodiment of the present invention.
  • FIG. 9 is a schematic flowchart of a method for establishing a bearer of a remote terminal device according to an embodiment of the present invention.
  • FIG. 10 is a schematic flowchart of another method for establishing a bearer of a remote terminal device according to an embodiment of the present invention.
  • FIG. 11 is a schematic block diagram of an apparatus for relay transmission according to an embodiment of the present invention.
  • FIG. 12 is a schematic block diagram of another apparatus for relay transmission according to an embodiment of the present invention.
  • FIG. 13 is a schematic block diagram of another apparatus for relay transmission according to an embodiment of the present invention.
  • FIG. 14 is a schematic block diagram of another apparatus for relay transmission according to an embodiment of the present invention.
  • FIG. 15 is a schematic block diagram of another apparatus for relay transmission according to an embodiment of the present invention.
  • FIG. 16 is a schematic block diagram of another apparatus for relay transmission according to an embodiment of the present invention.
  • system and “network” are used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • Network device 100 can be a device that communicates with a terminal device. Each network device 100 can provide communication coverage for a particular geographic area and can communicate with terminal devices located within the coverage area.
  • the network device 100 may be a base station (Base Transceiver Station (BTS) in a GSM system or a Code Division Multiple Access (CDMA) system, or may be a base station (NodeB, NB) in a WCDMA system, or may be An evolved base station (Evolutional Node B, eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or the network device may be a relay station, an access point, In-vehicle devices, wearable devices, network-side devices in future 5G networks, or network devices in the future evolution of the Public Land Mobile Network (PLMN).
  • BTS Base Transceiver Station
  • CDMA Code Division Multiple Access
  • NodeB NodeB
  • NB base station
  • An evolved base station Evolutional Node B, eNB or eNodeB
  • CRAN Cloud Radio Access Network
  • the network device may be a relay station, an access point, In-vehicle devices, wearable devices
  • the wireless communication system 100 also includes a plurality of terminal devices 120 located within the coverage of the network device 110.
  • the terminal device 120 can be mobile or fixed.
  • the terminal device 120 can refer to an access terminal, a user equipment (User Equipment, UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, and a user. Agent or user device.
  • the access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication.
  • FIG. 1 exemplarily shows one network device and six terminal devices.
  • the wireless communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device. The embodiment of the invention does not limit this.
  • the wireless communication system 100 may further include other network entities such as a Mobile Management Entity (MME), a Serving Gateway (S-GW), and a Packet Data Network Gateway (P-GW).
  • MME Mobile Management Entity
  • S-GW Serving Gateway
  • P-GW Packet Data Network Gateway
  • the terminal device 120 can communicate in a cellular communication mode or a D2D communication mode, wherein in the cellular communication mode, the terminal device can communicate with other terminal devices through the network device; in the D2D communication mode, the terminal device can pass the D2D chain The road communicates directly with other terminal devices.
  • a cellular terminal device, a D2D terminal device, and a relay terminal device are included, wherein the cellular terminal device communicates with the network device 110 using a cellular communication technology.
  • the D2D terminal device implements data transmission with the network device by using the relay terminal device, wherein the relay terminal device and the D2D terminal device have a PC5 interface, and the D2D communication technology is used for communication, wherein the D2D communication technology may be specifically
  • the bypass (SideLink, SL) technology in the LTE may also be a technology such as WIFI or Bluetooth in the WLAN, or other D2D communication technologies, which is not limited by the embodiment of the present invention.
  • the relay terminal device has a Uu interface with the network device, and uses cellular communication technology for communication.
  • the relay terminal device performs relaying by using a layer three relay mode, and the data processing delay is large.
  • the relay terminal device can use the layer 2 relay mode to relay data transmission between the network device and the D2D terminal device.
  • the Uu interface and the PC5 interface can both adopt Layer 2 PDUs (for example, The way of MAC PDU, RLC PDU or PDCP PDU is relayed.
  • 2a and 2b respectively illustrate an example of a user plane protocol stack for relay transmission of each device, wherein, optionally, the user plane protocol stack of the relay terminal device may include layer 1 and layer 2, D2D
  • the user plane protocol stack of the terminal device may include layer 1, layer 2, and layer 3.
  • the user plane protocol stack of the network device may include layer 1, layer 2, and layer 3, where layer 1 of the relay terminal device and the D2D respectively Layer 1 of the terminal device and layer 1 of the network device are peer layers, and layer 2 of the relay terminal device is layer 2 with the layer 2 of the D2D terminal device and layer 2 of the network device.
  • the D2D terminal device, the relay terminal device, and the network device may perform relay transmission in the manner of a Layer 2 PDU.
  • the user plane protocol stack of the relay terminal device may include only layer one and layer two, and does not include layer three.
  • layer 2 of the relay terminal device may be used to identify a remote terminal device that relays the transmission.
  • layer 2 of the relay terminal device may be used to identify and encapsulate the identification information of the D2D terminal device, but the embodiment of the present invention does not limit this.
  • the user plane protocol stack of the D2D terminal device and the network device may include a layer (ie, a physical (Physics) layer), a layer two, and a higher layer, where the layer 2 includes a MAC layer, RLC layer and PDCP layer.
  • the user plane protocol stack of the relay terminal device may include only layer one and layer two, wherein layer two may include only the MAC layer, or only the MAC layer and the RLC layer, or include the MAC layer, the RLC layer, and the PDCP layer.
  • the data relay transmission between the D2D terminal device, the relay terminal device, and the network device may be implemented by identifying the identification information of the D2D terminal device, where the identification information of the D2D terminal device may be identified.
  • the layer 2 is implemented, but the embodiment of the present invention does not limit this.
  • the D2D terminal device and the layer 2 of the network device are peer-to-peer with an adaptation layer.
  • the protocol stack of the D2D terminal device may include a PDCP layer, an RLC layer, an ADP (ADP) layer, and a lower layer corresponding to the D2D communication technology adopted by the PC5 interface, wherein if the D2D communication technology is specific For the bypass technology of LTE, the lower layer may be specifically a MAC layer and a PHY layer, and if the D2D communication technology is other communication technologies, for example, Bluetooth or WIFI technology, etc., the lower layer may be The layer of the other communication technology corresponding to the MAC layer and the physical layer.
  • the relay protocol stack of the relay terminal device may include layer one and layer two corresponding to the D2D communication technology.
  • the relay protocol stack of the network device may include a PDCP layer, an RLC layer, an ADP layer, a MAC layer, and a PHY layer.
  • PDCP layer PDCP layer
  • RLC layer RLC layer
  • ADP layer PDCP layer
  • MAC layer MAC layer
  • PHY layer PHY layer
  • the adaptation layer may be located between the MAC layer and the RLC layer, or may be located between the RLC layer and the PDCP, which is not limited by the embodiment of the present invention.
  • the adaptation layer may be used to identify the identification information of the D2D terminal device, or alternatively may also be used to identify the relay specific LCID used to indicate the relay transmission.
  • the adaptation layer may be used to convert data received from the lower layer and transmitted by various D2D communication technologies into a communication technology-independent form, and optionally transmit the processed data to the upper layer for further processing. deal with.
  • the adaptation layer may carry a layer 2 identifier of the D2D terminal device, or further carry a relay specific logical channel identifier, where the relay specific logical channel identifier may be used to identify the relay data.
  • the Layer 2 PDU that the relay terminal device sends to the network device through the Uu interface may not carry the D2D terminal. Any information of the device, while relaying the specific logical channel identifier to identify the relay data, but the embodiment of the present invention is not limited thereto.
  • FIG. 3 is a schematic diagram of a method 200 for relay transmission provided by an embodiment of the present invention.
  • the method 200 can be applied to the wireless communication system 100 described above, but the embodiment of the present invention is not limited thereto.
  • the method 200 can be applied to the relay transmission of the uplink data, that is, the remote terminal device transmits the uplink data to the network device by using the relay terminal device, and the device at the transmitting end is specifically the remote terminal device (also referred to as D2D terminal device), the receiving device is specifically a network device.
  • the method 200 is also applicable to the relay transmission of the downlink data, that is, the network device transmits the downlink data to the remote terminal device by using the relay terminal device.
  • the transmitting device is a network device
  • the receiving device is a remote device.
  • the terminal device is not limited in this embodiment of the present invention.
  • the sending end device performs encapsulation processing on the data to be sent or the information to be sent, and generates a first Layer 2 Protocol Data Unit (PDU).
  • PDU Layer 2 Protocol Data Unit
  • a Layer 2 PDU may refer to the outermost layer or the highest layer of data being encapsulated at layer 2 of the device.
  • the layer 2 may include a MAC layer, an RLC layer, and a PDCP layer.
  • the layer 2 PDU may specifically refer to a MAC PDU, an RLC PDU, or a PDCP PDU.
  • the specific form of the Layer 2 PDU transmitted on the PC5 interface may correspond to the D2D communication technology adopted by the PC5 interface.
  • the Layer 2 PDU transmitted by the PC5 interface may be specifically a MAC PDU
  • the Layer 2 PDU transmitted by the PC5 interface It can be specifically a Layer 2 PDU corresponding to the MAC PDU in the Bluetooth or WIFI technology, which is not limited in this embodiment of the present invention.
  • the first layer 2 PDU may carry the identifier information of the remote terminal device, the identifier information of the remote terminal device is used to identify the remote terminal device, and the identifier information of the remote terminal device may be used by the middle terminal device.
  • the relay terminal device can identify the identification information of the remote terminal device through the layer 2, but the embodiment of the present invention is not limited thereto.
  • the identifier information of the remote terminal device may include a terminal device identifier of the remote terminal device, where the terminal device identifier may be used to uniquely identify the remote terminal device.
  • the terminal device identifier may be predefined.
  • the terminal device identifier may be specifically a device identifier of the remote terminal device or a user identifier of the remote terminal device, and the like.
  • the identifier information of the remote terminal device may also include a specific identifier of the remote terminal device, where the specific identifier of the remote terminal device is used to uniquely identify the remote terminal device in the relay transmission.
  • the specific identifier can be predefined or networked Prepared for configuration.
  • the length of the specific identifier may be smaller than the length of the terminal device identifier to reduce signaling overhead.
  • the specific identifier may be a layer 2 identifier, that is, an identifier that is encapsulated and parsed at layer 2 of the device, where the layer 2 identifier may be predefined, or the network device allocates the remote terminal device, for example,
  • the layer 2 identifier is allocated to the remote terminal device in the process of establishing a bearer for the remote terminal device, but the embodiment of the present invention is not limited thereto.
  • the layer 2 identifier may be set in the PDCP layer, the RLC layer, or the MAC layer, that is, encapsulated and parsed by the PDCP layer, the RLC layer, or the MAC layer.
  • the layer 2 identifier may be set at a corresponding layer of the adaptation layer or the D2D communication technology, for example, if the relay terminal device
  • the Layer 2 identifier of the PC5 interface between the remote terminal device and the remote terminal device may be set in the MAC layer, but the embodiment of the present invention does not limit this.
  • the adaptation layer performs encapsulation and resolution of the identification information of the remote terminal device, when the remote terminal device or the network device has data to be sent,
  • the data is sequentially encapsulated in a PDCP layer, an RLC layer, and an adaptation layer.
  • the identifier of the remote terminal device (for example, the layer 2 identifier) may be carried in the adaptation layer, but the embodiment of the present invention is not limited thereto.
  • the network device receives the data from the remote terminal device on the network side, and may perform the PDCP layer, the RLC layer, and the MAC layer encapsulation on the data in sequence, where the identifier information of the remote terminal device may be carried in the MAC layer (for example, The layer 2 is identified), but the embodiment of the invention is not limited thereto.
  • the sending end device sends the first Layer 2 PDU to the relay terminal device.
  • the first layer 2 PDU may include a logical channel identifier (LCID) field or a bearer identifier field, where the setting of the logical channel identifier field or the bearer identifier field may cause the relay terminal device to determine the first two
  • the data or information carried in the layer PDU needs to be forwarded, that is, the data carried in the second layer 2 PDU is determined to be relay data.
  • the bearer identifier field may be used to carry the bearer identifier corresponding to the remote terminal device, where the logical channel identifier field may be used to carry the relay specific LCID, to indicate that the data carried by the first layer 2 PDU is relay data.
  • the relay terminal device is required to perform forwarding, where the relay specific LCID may be pre-configured or may be allocated by the network device, for example, the network device allocates the relay specific LCID in the process of establishing a bearer for the remote terminal device.
  • the relay specific LCID may be pre-configured or may be allocated by the network device, for example, the network device allocates the relay specific LCID in the process of establishing a bearer for the remote terminal device.
  • embodiments of the invention are not limited thereto.
  • the sending end device is a remote terminal device and the receiving end device is a network device
  • the remote terminal device may send the first Layer 2 PDU to the relay terminal device by using a transmission resource for relay transmission.
  • the relay terminal device may determine that the data carried in the first Layer 2 PDU needs to be forwarded according to the transmission resource occupied by the first Layer 2 PDU, but the embodiment of the present invention is not limited thereto.
  • the relay terminal device may determine, by using other manners, that the data carried in the first layer 2 PDU is the relay data, which is not limited in this embodiment of the present invention.
  • the relay terminal device may forward the data carried in the first Layer 2 PDU to the receiving end device according to the identifier information or the RNTI of the remote terminal device.
  • the receiving end device may perform encapsulation processing on the data carried in the first layer 2 PDU, for example, encapsulating the data carried in the first layer 2 PDU in layer 2, to obtain a second layer 2 PDU, and The second Layer 2 PDU is sent to the receiving device, but the embodiment of the present invention is not limited thereto.
  • the relay terminal device receives the first layer 2 PDU sent by the sending end device, determines the remote terminal device corresponding to the first layer 2 PDU, and performs encapsulation processing on the data carried in the first layer 2 PDU to generate the first Layer 2 and Layer 2 PDU.
  • the relay terminal device may determine, according to the identifier information of the remote terminal device carried in the first layer 2 PDU, a remote terminal device corresponding to the first layer 2 PDU, for example, the relay terminal device
  • the identifier information carried in the first layer 2 PDU may be identified in layer 2 to determine the remote terminal device corresponding to the first layer 2 PDU.
  • the source device is a network device
  • the data carried in the first layer 2 PDU is scheduled by the network device by using a physical downlink control channel (PDCCH), where the PDCCH is used.
  • PDCCH physical downlink control channel
  • the radio network Temporary Identity (RNTI) of the remote terminal device is scrambled.
  • the relay terminal device may determine the remote terminal device corresponding to the first layer 2 PDU according to the RNTI used by the PDCCH for scheduling the first layer 2 PDU, but the embodiment of the present invention is not limited thereto.
  • the RNTI of the remote terminal device may be predefined, or the network device allocates the remote terminal device, for example, the network device is the remote device in the process of establishing a bearer for the remote terminal device.
  • the terminal device allocates an RNTI.
  • the relay terminal device may determine the remote terminal device corresponding to the first layer 2 PDU according to the RNTI used by the PDCCH for scheduling the first layer 2 PDU, but the embodiment of the present invention is not limited thereto. .
  • the relay terminal device may perform encapsulation processing on the data carried in the first Layer 2 PDU to generate a second Layer 2 PDU, for example, the number carried in the Layer 2 PDU in Layer 2 According to the encapsulation process, a second Layer 2 PDU is generated.
  • the first layer 2 PDU can meet an interface communication protocol between the relay terminal device and the source device, and the second layer 2 PDU can satisfy an interface communication protocol between the relay terminal device and the receiver device.
  • the relay terminal device may perform decapsulation and encapsulation processing on the first Layer 2 PDU in order to connect the MAC of the first interface.
  • the PDU is converted into a MAC PDU of the second interface, where the first interface is a communication interface between the relay terminal device and the sending end device, and the second interface is a communication interface between the relay terminal device and the receiving end device.
  • the sending device is a remote terminal device and the receiving device is a network device
  • the first interface is a PC5 interface
  • the second interface is a Uu interface.
  • the sending device is a network device and the receiving device is a remote terminal device
  • the first interface is a Uu interface
  • the second interface is a PC5 interface.
  • the transmitting device is a network device
  • the relay terminal device determines that the data carried in the first Layer 2 PDU is relay data
  • the data may be encapsulated and processed according to the communication technology of the PC5 interface, and the PC5 is satisfied.
  • the second Layer 2 PDU of the interface protocol is sent through the user plane (PC5-User Plane, PC5-U) of the PC5 interface.
  • the source device is a remote terminal device
  • the relay terminal device determines that the data carried in the first layer 2 PDU is relay data
  • the data may be encapsulated according to the communication technology of the Uu interface.
  • a second Layer 2 PDU eg, LTE Uu MAC PDU
  • LTE Uu MAC PDU LTE Uu MAC PDU
  • the second layer 2 PDU may carry identifier information of the remote terminal device, such as a terminal device identifier or a layer 2 identifier.
  • the first Layer 2 PDU may carry the terminal device identifier of the remote terminal device, and at this time, the relay terminal The device may determine a layer 2 identifier corresponding to the terminal device identifier, and carry the layer 2 identifier in the second layer 2 PDU.
  • the network device may determine, according to the layer 2 identifier of the remote terminal device carried in the second layer 2 PDU, the remote terminal device corresponding to the second layer 2 PDU, and the core network device (for example, a packet data network gateway) (Packet Data Network Gateway, P-GW)) transmitting data carried in the second layer 2 PDU.
  • a packet data network gateway Packet Data Network Gateway, P-GW
  • the relay terminal device may further initiate an uplink authorization request process, and send the uplink transmission resource allocated by the network device to the network device.
  • the second layer two PDU may be further initiated before the relay terminal device sends the uplink data to the network device according to the relay terminal device.
  • the uplink authorization request process is performed, for example, the relay terminal device sends a scheduling request to the network device, where the scheduling request is used to request the network device to allocate an uplink transmission resource for the relay terminal device; the network device may be configured according to the scheduling request, The relay terminal device allocates an uplink transmission resource, and sends an uplink grant to the relay terminal device, where the uplink grant is used to indicate a transmission resource allocated by the network device to the relay terminal device; the relay terminal device may adopt the uplink The transmission resource sends the second layer 2 PDU to the network device.
  • the relay terminal device may determine a preamble allocated by the network device to the remote terminal device, and initiate an uplink authorization request procedure by sending the preamble to the network device.
  • the network device may determine, according to the received preamble, the remote terminal device corresponding to the allocated uplink transmission resource, and after receiving the second layer 2 PDU, according to the second layer 2 PDU.
  • the uplink transmission resource determines the remote terminal device.
  • the second layer 2 PDU may not carry the identifier information of the remote terminal device, thereby further saving signaling overhead.
  • the relay terminal device may send a Buffer Status Report (BSR) to the network device, where the BSR carries identification information of the remote terminal device, such as a layer 2 identifier or a terminal device identifier, after receiving the BSR, the network device may identify the identifier information of the remote terminal device, and send a PDCCH to the relay terminal device to schedule uplink data transmission of the remote terminal device, where The PDCCH carries the identification information of the remote terminal device. After receiving the PDCCH, the relay terminal device may send the second layer 2 PDU to the network device according to the PDCCH.
  • BSR Buffer Status Report
  • the network device may determine, according to the PDCCH for scheduling the second layer 2 PDU, the terminal device corresponding to the second layer 2 PDU, and at this time, optionally, the second layer 2 PDU sent by the relay terminal device.
  • the identification information of the remote terminal device may not be carried, but the embodiment of the present invention is not limited thereto.
  • the first layer 2 PDU may optionally carry the layer 2 identifier of the remote terminal device.
  • the relay terminal device may determine the terminal device identifier corresponding to the layer 2 identifier, and carry the terminal device identifier in the second layer 2 PDU.
  • the remote terminal device determines whether the second layer 2 PDU is sent to itself according to the terminal device identifier carried by the second layer 2 PDU.
  • the data relay transmission between the remote terminal device and the relay terminal device may identify the remote terminal device by using the terminal device identifier of the remote terminal device, and the relay terminal device and the network device Data relay transmission between the remote terminal devices
  • the layer 2 identifier is used to identify the remote terminal device. Therefore, the remote terminal device may not know its own layer 2 identifier, but the embodiment of the present invention is not limited thereto.
  • the second layer 2 PDU may further carry indication information indicating that the data carried by the second layer 2 PDU is relay data, for example, if the network device includes an adaptation layer, the indication information may include Relay a specific LCID. At this time, the network device may determine, according to the indication information, that the received second layer PDU is relayed by the relay terminal device, but the embodiment of the present invention is not limited thereto.
  • the second layer 2 PDU may further carry the identifier information of the relay terminal device, for example, the terminal device identifier, and the like, but the embodiment of the present invention is not limited thereto.
  • the relay terminal device sends the second layer 2 PDU to the receiver device.
  • the relay terminal device may forward the data carried in the first layer 2 PDU to the receiving end device according to the remote terminal device corresponding to the first layer 2 PDU, for example, the relay terminal device sends the data to the receiving end device.
  • the second layer 2 PDU carries the identifier information of the remote terminal device, or the second layer 2 PDU is sent by using the uplink transmission resource allocated by the network device for the remote terminal device, but the embodiment of the present invention is not limited thereto. .
  • the relay terminal device may send the second Layer 2 PDU to the remote terminal device by using a transmission resource for relay transmission, where the remote terminal device may
  • the second layer PDU carries the relay data, which is forwarded by the relay terminal device according to the transmission resource occupied by the second layer 2 PDU, but the embodiment of the present invention is not limited thereto.
  • the receiving end device may perform parsing processing on the second layer 2 PDU. For example, if the receiving device is a network device and the second Layer 2 PDU carries a relay specific logical channel identifier, the network device may determine the first by using a relay specific logical channel identifier carried in the second Layer 2 PDU. The data carried by the Layer 2 and Layer 2 PDUs is relay data. Optionally, the network device may transmit the data carried in the second Layer 2 PDU to the core network through the S1-U interface.
  • the network device may further determine, according to the identifier information of the remote terminal device carried in the second Layer 2 PDU, the remote terminal device corresponding to the second Layer 2 PDU, and at this time, if the network device and the core
  • the data transmission channel of the remote terminal device such as the GPRS Tunneling Protocol (GTP)
  • GTP GPRS Tunneling Protocol
  • the data carried in the second layer 2 PDU is sent to the core network device, but the embodiment of the present invention is not limited thereto.
  • the remote terminal device may determine, according to the transmission resource occupied by the second Layer 2 PDU, that the data carried in the second Layer 2 PDU is the relay terminal device relay. Forwarded.
  • the remote terminal device may be configured to determine whether the second layer 2 PDU is sent to itself by identifying the identifier information of the remote terminal device carried in the second layer 2 PDU.
  • the remote terminal device may further perform decoding processing on the second Layer 2 PDU to obtain data carried in the second Layer 2 PDU. If it is determined that the second layer 2 PDU is not sent to itself, the remote terminal device may discard the second layer 2 PDU, but the embodiment of the present invention is not limited thereto.
  • the relay terminal device relays data between the remote terminal device and the network device in a layer two relay manner, for example, the relay terminal device performs relaying in a MAC relay manner.
  • the relay terminal device and the remote terminal device and the network device may each transmit data in the manner of a MAC PDU.
  • the MAC PDU may carry the identifier information of the remote terminal device, such as the layer 2 identifier of the remote terminal device or the terminal device identifier.
  • the identifier information of the remote terminal device may be carried in a MAC control element (Control Element, CE) of the MAC PDU, and the MAC CE may be an existing MAC CE or a new MAC CE, for example, as shown in FIG.
  • Control Element, CE Control Element
  • the MAC CE may be an existing MAC CE or a new MAC CE, for example, as shown in FIG.
  • embodiments of the invention are not limited thereto.
  • the network device may further establish an Evovled Packet System (EPS) bearer for the remote terminal device before performing the relay transmission.
  • the EPS bearer may include a data transmission channel (for example, a GTP tunnel) between the network device and the P-GW, and a radio bearer established by the network device, where the radio bearer may include the network device and the relay.
  • the relay terminal device may receive a connection establishment request of the remote terminal device, where the connection establishment request is used to request to establish a D2D communication link between the relay terminal device and the remote terminal device.
  • the connection establishment request may be specifically a direct communication request, and is used to request to establish Establish a PC5 connection with the relay terminal device.
  • the relay terminal device may send a bearer setup request to the core network device according to the connection setup request, where the bearer setup request may carry the terminal device identifier of the remote terminal device.
  • the core network device may be an MME, and the MME may send the terminal device identifier of the remote terminal device carried in the bearer setup request to the P-GW, so as to establish the relationship between the P-GW and the network device.
  • a data transmission channel for example, a GTP tunnel
  • the network device can establish a radio bearer of the remote terminal device.
  • the relay terminal device may receive a bearer setup response sent by the network device, where the bearer setup response carries the configuration information of the EPS bearer established by the network device for the remote terminal device, where, optionally, the configuration information of the EPS bearer
  • the configuration information of the radio bearer may be included.
  • the configuration information of the radio bearer may include layer 2 configuration information (such as MAC layer configuration information) and physical layer configuration information.
  • the configuration information of the EPS bearer may further include configuration information of the remote terminal device facing the user of the network device, such as PDCP layer configuration information and/or RLC layer configuration information.
  • the MAC layer configuration information may include a layer 2 identifier and/or a relay specific LCID allocated by the network device to the remote terminal device, where the physical layer configuration information may include at least one of the following: The information about the transmitted transmission resource, the preamble assigned to the remote terminal device, and the RNTI allocated for the remote terminal device, but the embodiment of the present invention is not limited thereto.
  • the relay terminal device may send a connection establishment response to the remote terminal device according to the bearer setup response.
  • the connection setup response carries the physical layer configuration information and the MAC layer configuration information.
  • the configuration information of the relay terminal device and the remote terminal device for relay transmission such as the information of the layer 2 identifier and/or the transmission resource, or the PDCP layer configuration information and/or the RLC layer configuration information.
  • the remote terminal device may perform PDCP layer and/or according to the received D2D broadcast message of the relay terminal device.
  • the RLC layer is configured.
  • connection setup response carries PDCP layer configuration information and/or RLC layer configuration information
  • the remote terminal device may perform RLC layer configuration information and/or PDCP layer configuration carried according to the connection establishment response.
  • the layer 2 is configured in at least one of the information, but the embodiment of the invention is not limited thereto.
  • the data between the remote terminal device and the network device is relayed by the relay terminal device in a layer two relay manner, wherein the remote terminal device or the network device
  • the Layer 2 PDU sent by the relay terminal device carries the identifier of the remote terminal device.
  • the information, or the network device uses the RNTI of the remote terminal device to scramble the PDCCH for scheduling the Layer 2 PDU, and the relay terminal device may determine, according to the identifier information of the remote terminal device or the RNTI, the Layer 2 PDU corresponding to the PDCCH.
  • the remote terminal device forwards the data carried in the Layer 2 PDU.
  • the processing complexity of the relay terminal device can be reduced and the processing complexity can be reduced.
  • the transmission delay of the relay data improves the overall performance of the system.
  • the cellular network has established a PDN connection and a bearer for the remote terminal device
  • the remote terminal device is specifically a remote UE
  • the relay terminal device is specifically a relay UE
  • the network device is specifically The eNB
  • the Layer 2 PDU of the PC5 interface and the Layer 2 PDU of the Uu interface are both MAC PDUs.
  • Layer 2 of the remote terminal device includes an adaptation layer
  • the PC5 interface adopts other D2D communication different from the LTE bypass technology.
  • the PDU of the PC5 interface may be a layer 2 PDU corresponding to the other D2D communication technologies, but the embodiment of the present invention is not limited thereto.
  • FIG. 5 schematically illustrates a method 300 of relay transmission provided by another embodiment of the present invention.
  • the method 300 can be applied to relay transmission of downlink data.
  • the remote terminal device is identified by using the layer 2 identifier of the remote terminal device.
  • the P-GW When receiving the data sent to the remote terminal device, the P-GW sends the data to the eNB through the GTP-U of the S1-U interface allocated in the bearer setup process.
  • the eNB after receiving the data of the remote terminal device from the GTP-U, the eNB encapsulates the data into a MAC PDU of the Uu interface, where the MAC CE in the MAC PDU of the Uu interface carries the layer 2 identifier of the remote terminal device. Or terminal device identification.
  • the eNB may schedule downlink data transmission by relaying the PDCCH addressed by the specific RNTI, and transmit the MAC PDU of the Uu interface to the relay terminal device on the Physical Downlink Shared Channel (PDSCH).
  • PDSCH Physical Downlink Shared Channel
  • the eNB may scramble the PDCCH by relaying a specific RNTI to indicate that the PDCCH is used to schedule relay data transmission.
  • the relay terminal device can perform addressing according to the relay specific RNTI, but the embodiment of the present invention is not limited thereto.
  • the relay terminal device After receiving the MAC PDU of the Uu interface, the relay terminal device can parse out The layer 2 identifier or the terminal device identifier of the remote terminal device carried in the MAC PDU, and the data may be encapsulated to obtain a MAC PDU of the PC5 interface, where, if the remote terminal device knows its own The layer 2 identifier indicates that the MAC PDU of the PC5 interface can carry the layer 2 identifier of the remote terminal device. Alternatively, the relay terminal device may associate the layer 2 identifier of the remote device with the terminal device identifier of the remote terminal device, and the MAC PDU of the PC5 interface may carry the terminal device identifier of the remote terminal device, but The embodiment of the invention is not limited thereto.
  • the relay terminal device sends the MAC PDU of the PC5 interface on a specific time-frequency resource used for relay transmission.
  • the remote terminal device After receiving the MAC PDU of the PC5 interface, the remote terminal device parses the MAC PDU. If the MAC PDU carries the terminal device identifier or the layer 2 identifier of the remote terminal device, the data is forwarded to the upper layer for further processing; otherwise, the remote terminal device discards the MAC PDU.
  • FIG. 6 schematically illustrates a method 400 of relay transmission provided by another embodiment of the present invention.
  • the method 400 can be applied to relay transmission of downlink data.
  • the remote terminal device is identified by the RNTI of the remote terminal device.
  • S410 is the same as the S310.
  • S410 refers to the description of the foregoing embodiment. For brevity, details are not described herein again.
  • the eNB After receiving the data from the remote terminal device of the GTP-U, the eNB encapsulates the data into a MAC PDU of the Uu interface.
  • the MAC PDU of the Uu interface may not carry the identifier information of the remote UE.
  • the eNB may schedule downlink data transmission of the relay terminal device by using the PDCCH, and transmit the MAC PDU of the Uu interface to the relay terminal device on the PDSCH, where the PDCCH is scrambled by using the RNTI of the remote terminal device.
  • the relay terminal device can be addressed by using the foregoing RNTI of the remote terminal device, but the embodiment of the present invention is not limited thereto.
  • the RNTI of the remote terminal device can be used to identify the remote terminal device during the relay transmission.
  • the RNTI of the remote terminal device may be predefined, or may be allocated by the network device to the remote terminal device, for example, during bearer setup, but the embodiment of the present invention is not limited thereto.
  • the relay terminal device may determine, according to the RNTI used by the PDCCH for scheduling the MAC PDU, the corresponding MAC PDU.
  • the remote terminal device encapsulates the MAC PDU of the PC5 interface with the data carried in the MAC PDU of the Uu interface, where the MAC PDU of the PC5 interface can carry the terminal device identifier or layer associated with the RNTI of the remote terminal device. Two logos.
  • S450-S460 is the same as S350-S360.
  • S450-S460 is the same as S350-S360.
  • details refer to the description of the foregoing embodiments. For brevity, details are not described herein again.
  • FIG. 7 schematically illustrates a method 500 of relay transmission provided by another embodiment of the present invention.
  • the method 500 can be applied to relay transmission of uplink data.
  • the layer 2 identifier of the remote terminal device or the terminal device identifier is used to identify the remote terminal device.
  • the remote terminal device When the remote terminal device has data to be sent to the cellular network, the remote terminal device encapsulates the data into a MAC PDU, where the MAC PDU carries the terminal device identifier or the layer 2 identifier of the remote terminal device.
  • the remote terminal device sends the MAC PDU on a time-frequency resource used for relay transmission through a PC5 interface.
  • the relay terminal device parses the MAC PDU of the PC5 interface, and encapsulates the MAC PDU of the Uu interface according to the terminal device identifier or the layer 2 identifier carried in the MAC PDU of the PC5 interface.
  • the MAC PDU of the Uu interface carries the layer 2 identifier or the terminal device identifier allocated by the network device for the remote terminal device.
  • the relay terminal device may initiate an uplink authorization request.
  • the relay terminal device may initiate an uplink authorization request process by using an existing process, but the embodiment of the present invention is not limited thereto.
  • the relay terminal device sends the MAC PDU of the Uu interface to the eNB by using an uplink transmission resource allocated by the eNB in the uplink authorization process.
  • the eNB parses the MAC PDU of the Uu interface to identify the layer 2 identifier or the terminal device identifier of the remote terminal device.
  • the eNB transmits, by using the S1 interface, the data carried in the MAC PDU to the P-GW in the GTP-U corresponding to the layer 2 identifier or the terminal device identifier.
  • FIG. 8 is a schematic diagram of a method 600 of relay transmission provided by another embodiment of the present invention.
  • the method 600 can be applied to relay transmission of uplink data.
  • S610-S620 is the same as S510-S520.
  • S510-S520 For details, refer to the description of the foregoing embodiment. For brevity, details are not described herein.
  • the relay terminal device After the relay terminal device receives the MAC PDU from the remote terminal device, parsing Receiving the MAC PDU of the PC5 interface to determine the remote terminal device corresponding to the MAC PDU, and encapsulating the MAC PDU of the PC5 interface as a MAC PDU of the Uu interface.
  • the relay terminal device determines, according to the terminal device identifier or the layer 2 identifier of the remote terminal device carried in the MAC PDU of the PC5 interface, the preamble configured by the network device for the remote terminal device, and uses the preamble to initiate the uplink authorization. Request process.
  • the eNB may allocate an uplink transmission resource to the data of the remote terminal device according to the preamble.
  • the network device may allocate the preamble to the remote terminal device during the process of establishing a bearer for the remote terminal device.
  • the relay terminal device may associate the preamble with the identification information of the remote terminal device, but the embodiment of the present invention is not limited thereto.
  • the relay terminal device may send the MAC PDU of the Uu interface to the eNB by using an uplink transmission resource allocated by the eNB in the uplink authorization process.
  • S660-S670 is the same as S560-S570.
  • S560-S570 For details, refer to the description of the foregoing embodiment. For brevity, details are not described herein.
  • the relay terminal device requests the uplink authorization by using the preamble corresponding to the remote terminal device.
  • the eNB may determine the remote terminal device corresponding to the preamble and allocate an uplink transmission resource to the relay terminal device. At this time, the eNB may transmit the remote terminal device and the uplink transmission. Resources are associated.
  • the eNB may determine the remote terminal device corresponding to the MAC PDU of the Uu interface according to the uplink transmission resource. At this time, the MAC PDU of the Uu interface may not carry the identification information of the remote terminal device, thereby further reducing signaling overhead.
  • FIG. 9 is a schematic diagram of a method 700 for establishing a bearer according to an embodiment of the present invention.
  • the remote terminal device has been attached to a cellular network (such as an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), or the remote terminal device has been established with the cellular network.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • the PDN connection is provided, but the embodiment of the present invention is not limited thereto.
  • the remote terminal device discovers the relay terminal device and camps on.
  • the remote terminal device sends a direct communication request to the relay terminal device, where the direct communication request may carry the terminal device identifier of the remote terminal device and the IP address of the PDN connection of the remote terminal device. .
  • the direct communication request may be specifically used to establish the remote terminal device and the relay terminal device A D2D communication link between the remote terminal device and the PC5 between the remote terminal device, but the embodiment of the present invention is not limited thereto.
  • the relay terminal device After receiving the direct communication request sent by the remote terminal device, the relay terminal device reports the terminal device identifier of the remote terminal device and the IP address of the PDN connection to the MME.
  • the MME may store the terminal device identifier and the IP address, and transmit the same to the S-GW/P-GW.
  • the MME and the S-GW allocate a GTP tunnel of the S1-U interface, such as a Tunnel Endpoint Identifier (TEID), to the remote terminal device.
  • TEID Tunnel Endpoint Identifier
  • the eNB allocates a radio bearer to the remote terminal device, where the eNB may include a layer 2 identifier and/or an RNTI allocated to the remote terminal device.
  • the radio bearer may include a cellular data transmission channel between the access network device and the relay terminal device and a D2D data transmission channel between the relay terminal device and the remote terminal device.
  • the configuration information of the radio bearer may include physical layer configuration information and MAC layer configuration information.
  • the physical layer configuration information may include allocating a preamble to the remote terminal device, but the embodiment of the present invention is not limited thereto. this.
  • the relay terminal device sends a direct communication response to the remote terminal device.
  • the direct communication response may carry a Radio Resource Control (RRC) container, where the RRC container may be encapsulated with an RLC layer configuration and/or a PDCP layer configuration.
  • RRC Radio Resource Control
  • the remote terminal device can configure a corresponding RLC layer and/or a PDCP layer according to the RRC configuration in the direct communication response.
  • the direct communication response may also carry the layer 2 identifier allocated by the network device to the remote terminal device, but the embodiment of the present invention is not limited thereto.
  • FIG. 10 is a schematic diagram of another method 800 for establishing a bearer according to an embodiment of the present invention.
  • the method 800 it is assumed that the remote terminal device has not established a default PDN connection.
  • the remote terminal device discovers the relay terminal device and camps on.
  • the remote terminal device sends a direct communication request to the relay terminal device, where the direct communication request may carry the terminal device identifier of the remote terminal device and the indication information for requesting to establish a PDN connection.
  • the direct communication request may be used to request to establish a PC5 connection between the remote terminal device and the relay terminal device, and optionally also for requesting establishment of a PDN between the remote terminal device and the cellular network. connection.
  • the relay terminal device may send a PDN connection establishment request to the MME according to the direct communication request, requesting to establish a PDN connection of the remote terminal device.
  • the PDN connection establishment request may carry the terminal device identifier of the remote terminal device.
  • the core network device (MME or S-GW/P-GW) creates a PDN connection for the remote terminal device and assigns an IP address to the remote terminal device.
  • the MME sends a PDN connection setup response to the relay terminal device, where the PDN connection setup response carries configuration information of the PDN connection, such as an IP address.
  • the MME allocates an S1-U GTP tunnel, such as a TEID, to the remote terminal device.
  • the eNB allocates, by the remote terminal device, a radio bearer between the relay terminal device and the eNB, where the eNB may include a layer 2 identifier and/or an RNTI allocated to the remote terminal device.
  • the relay terminal device sends a direct communication response to the remote terminal device.
  • the direct communication response may carry an RRC container, where the RRC container may be encapsulated with an RLC layer configuration and/or a PDCP layer configuration.
  • the remote terminal device can configure a corresponding RLC layer and/or a PDCP layer according to the RRC configuration in the direct communication response.
  • the direct communication response may also carry the layer 2 identifier allocated by the network device to the remote terminal device, but the embodiment of the present invention is not limited thereto.
  • FIG. 5 to FIG. 10 are intended to help those skilled in the art to better understand the embodiments of the present invention and not to limit the scope of the embodiments of the present invention. It will be obvious to those skilled in the art that various modifications and changes can be made without departing from the scope of the embodiments of the present invention.
  • FIG. 11 shows an apparatus 900 for relay transmission according to an embodiment of the present invention.
  • the apparatus 900 includes:
  • the receiving unit 910 is configured to receive the first layer 2 protocol data unit PDU that is sent by the sending end device to the receiving end device, where the first layer 2 PDU carries the identifier information of the remote terminal device, or the first layer 2 PDU is Scheduling the physical downlink control channel PDCCH that is scrambled by using the radio network temporary identifier RNTI of the remote terminal device;
  • the processing unit 920 is configured to generate a second Layer 2 PDU according to the first Layer 2 PDU received by the receiving unit 910.
  • the sending unit 930 is configured to send the second layer 2 PDU generated by the processing unit 920 to the receiving end device;
  • the sending end device is the remote terminal device and the receiving end device is a network device, or the sending end device is a network device and the receiving end device is the remote terminal device.
  • the identifier information of the remote terminal device includes a terminal device identifier of the remote terminal device or a layer 2 identifier of the remote terminal device.
  • the processing unit 920 is specifically configured to: determine a terminal device identifier corresponding to the layer 2 identifier, and perform encapsulation processing on the data carried in the first layer 2 PDU to generate a second layer 2 PDU, where the The Layer 2 and Layer 2 PDU carries the corresponding terminal device identifier.
  • the processing unit 920 is further configured to: before generating the second Layer 2 PDU according to the first Layer 2 PDU, determining a preamble corresponding to the identification information of the remote terminal device;
  • the sending unit 930 is further configured to send the preamble determined by the processing unit 920 to the network device.
  • the receiving unit 910 is further configured to receive an uplink grant sent by the network device according to the preamble, where the uplink grant indicates an uplink transmission resource allocated by the network device;
  • the sending unit 930 is specifically configured to send the second layer 2 PDU to the network device by using the uplink transmission resource of the uplink grant indication received by the receiving unit 910.
  • the sending unit 930 is further configured to: before sending the second Layer 2 PDU to the receiving end device, to the network device Sending a buffer status report BSR, where the BSR carries the identification information of the remote terminal device;
  • the receiving unit 910 is further configured to receive a PDCCH that is sent by the network device according to the BSR, where the PDCCH carries the identifier information of the remote terminal device;
  • the sending unit 930 is specifically configured to send the second layer 2 PDU to the network device according to the PDCCH received by the receiving unit 910.
  • the sending end device is the remote terminal device and the receiving end device is a network device
  • the identification information of the remote terminal device includes the terminal device identifier of the remote terminal device.
  • the processing unit 920 is specifically configured to: determine a layer 2 identifier corresponding to the terminal device identifier, and perform encapsulation processing on the data carried in the first layer 2 PDU to generate a second layer 2 PDU, where the The Layer 2 and Layer 2 PDU carries the corresponding layer 2 identifier.
  • the first Layer 2 PDU carries a relay specific logical channel identifier.
  • the processing unit 920 is further configured to determine, according to the relay specific logical channel identifier, that the data carried in the first Layer 2 PDU needs to be forwarded before the second Layer 2 PDU is generated according to the first Layer 2 PDU.
  • the second Layer 2 PDU carries a relay specific logical channel identifier.
  • the network device determines that the data carried in the second Layer 2 PDU is forwarded by the relay terminal device according to the specific logical channel identifier of the relay.
  • the sending end device is the remote terminal device and the receiving end device is a network device
  • the first Layer 2 PDU is sent by the remote terminal device by using a transmission resource for relay transmission.
  • the processing unit 920 is further configured to: before the generating the second Layer 2 PDU according to the first Layer 2 PDU, determine, according to the transmission resource, that the data carried in the first Layer 2 PDU needs to be forwarded.
  • the sending unit 930 may be specifically configured to send the second second to the remote terminal device by using a transmission resource transmitted by the relay. Layer PDU.
  • the remote terminal device determines that the data carried in the second Layer 2 PDU is forwarded by the relay terminal device according to the transmission resource occupied by the second Layer 2 PDU.
  • the first layer 2 PDU is scheduled by the network device by using a physical downlink control channel PDCCH that is scrambled by the relay specific RNTI.
  • the processing unit 920 is further configured to: before generating the second Layer 2 PDU according to the first Layer 2 PDU, determine, according to the relay specific RNTI used for scheduling the PDCCH of the first Layer 2 PDU, to forward the The data carried in the first Layer 2 PDU.
  • the receiving unit 910 is further configured to: before receiving the first Layer 2 PDU sent by the sending end device, receive a connection establishment request of the remote terminal device, where the connection establishment request is used to request to establish the relay terminal device and a D2D communication link between the remote terminal devices; the sending unit 930 is further configured to send a bearer setup request to the core network device according to the connection setup request, where the bearer setup request carries the terminal device identifier of the remote terminal device, The core network device and the network device establish an EPS bearer of the remote terminal device; the receiving unit 910 is further configured to receive the network device.
  • the bearer setup response carries configuration information of an EPS bearer established by the network device for the remote terminal device, where the EPS bearer includes a cellular data transmission channel between the network device and the relay terminal device And a D2D data transmission channel between the relay terminal device and the remote terminal device.
  • the configuration information of the EPS bearer includes MAC layer configuration information and physical layer configuration information.
  • the sending unit 930 is further configured to send a connection establishment response to the remote terminal device, where the connection establishment response carries the physical layer configuration information and the MAC layer configuration information.
  • the device 900 may be specifically the relay terminal device in the foregoing embodiment, and the device 900 may be used to perform various processes and/or steps corresponding to the relay terminal device in the foregoing method embodiment, in order to avoid duplication. , will not repeat them here.
  • FIG. 12 is a schematic diagram of another apparatus 1100 for relay transmission according to an embodiment of the present invention.
  • the apparatus 1100 includes:
  • the processing unit 1110 is configured to perform encapsulation processing on the data to be sent to the receiving device to generate a first Layer 2 protocol data unit PDU, where the first Layer 2 PDU carries the identifier information of the remote terminal device, or the first two
  • the layer PDU is scheduled by using a physical downlink control channel PDCCH that is scrambled by using a radio network temporary identifier RNTI of the remote terminal device;
  • the sending unit 1120 is configured to send the first layer 2 PDU generated by the processing unit 1110 to the relay terminal device.
  • the device 1100 is the remote terminal device and the receiving device is a network device, or the device 1100 is a network device and the receiving device is the remote terminal device.
  • the identifier information of the remote terminal device includes a terminal device identifier of the remote terminal device or a layer 2 identifier of the remote terminal device.
  • the first Layer 2 PDU carries a relay specific logical channel identifier, where the relay specific logical channel identifier is used by the relay terminal device to determine that the data carried in the first Layer 2 PDU needs to be forwarded.
  • the sending unit 1120 is specifically configured to send the first Layer 2 PDU to the relay terminal device by using a transmission resource for relay transmission.
  • the sending unit 1120 is further configured to send, by using the relay specific RNTI, scrambling to the relay terminal device before sending the first Layer 2 PDU to the relay terminal device.
  • a PDCCH the PDCCH is used to schedule the first Layer 2 PDU, where the relay specific RNTI is used by the relay terminal device to determine data carried in the first Layer 2 PDU. To be forwarded.
  • the device 1100 further includes:
  • a receiving unit configured to receive a bearer setup request, where the bearer setup request carries the terminal device identifier of the remote terminal device, before the processing unit 1110 generates the first Layer 2 PDU;
  • the processing unit 1110 is further configured to establish an EPS bearer of the remote terminal device according to the bearer setup request received by the receiving unit, where the EPS bearer includes a cellular data transmission channel between the network device and the relay terminal device. And a D2D data transmission channel between the relay terminal device and the remote terminal device;
  • the sending unit 1120 is further configured to send a bearer setup response to the relay terminal device, where the bearer setup response carries configuration information of the EPS bearer.
  • the configuration information of the EPS bearer may include MAC layer configuration information and physical layer configuration information. Or it may further include PDCP layer configuration information and/or RLC layer configuration information.
  • the device 1100 may be specifically the sending end device in the foregoing embodiment, where the device 1100 may be used to perform various processes and/or steps corresponding to the sending end device in the foregoing method embodiment, in order to avoid duplication, This will not be repeated here.
  • FIG. 13 is a schematic diagram of another relay transmission apparatus 1200 according to an embodiment of the present invention.
  • the apparatus 1200 includes:
  • the receiving unit 1210 is configured to receive a second layer 2 protocol data unit PDU that is sent by the relay terminal device, where the second layer 2 PDU is generated by the relay terminal device according to the first layer 2 PDU sent by the sending end device, where the The Layer 2 PDU carries the identification information of the remote terminal device, or the first Layer 2 PDU is scheduled by using the physical downlink control channel PDCCH that is scrambled by the radio network temporary identifier RNTI of the remote terminal device;
  • the processing unit 1220 is configured to determine, by the receiving unit 1210, the remote terminal device corresponding to the second layer 2 PDU;
  • the device at the sending end is the remote terminal device and the device 1200 is a network device, or the device at the sending end is a network device and the device 1200 is the remote terminal device.
  • the identifier information of the remote terminal device includes: a terminal device identifier of the remote terminal device or a layer 2 identifier of the remote terminal device.
  • the second Layer 2 PDU carries the terminal device identifier of the remote terminal device.
  • the processing unit 1220 is specifically configured to determine, according to the terminal device identifier carried in the second layer 2 PDU, the remote terminal corresponding to the second layer 2 PDU. device.
  • the receiving unit 1210 is further configured to: before receiving the second Layer 2 PDU sent by the relay terminal device, receive the remote terminal device corresponding to the remote terminal device Preamble.
  • the device 1200 further includes: a sending unit, configured to send, according to the preamble received by the receiving unit 1210, an uplink grant, where the uplink grant indicates an uplink transmission resource allocated by the network device;
  • the receiving unit 1210 is specifically configured to receive, by the relay terminal device, the second layer 2 PDU sent by the uplink transmission resource of the uplink grant indication sent by the sending unit;
  • the processing unit 1220 is specifically configured to determine, according to the uplink transmission resource occupied by the second layer 2 PDU, the remote terminal device corresponding to the second layer 2 PDU.
  • the receiving unit 1210 is further configured to: before receiving the second Layer 2 PDU sent by the relay terminal device, receive a buffer status report BSR sent by the relay terminal device, where The BSR carries the identification information of the remote terminal device.
  • the apparatus 1200 further includes: a sending unit, configured to send, according to the BSR received by the receiving unit 1210, a PDCCH to the relay terminal device, where the PDCCH carries the identifier information of the remote terminal device;
  • the processing unit 1220 is specifically configured to determine, according to the PDCCH for scheduling the second layer 2 PDU, the remote terminal device corresponding to the second layer 2 PDU.
  • the identifier information of the remote terminal device includes the terminal device identifier of the remote terminal device, and the second Layer 2 PDU carries the layer 2 identifier of the remote terminal device.
  • the processing unit 1220 is specifically configured to determine, according to the layer 2 identifier carried in the second layer 2 PDU, the remote terminal device corresponding to the second layer 2 PDU.
  • the device 1200 may be specifically the receiving device in the foregoing embodiment, and the device 1200 may be configured to perform various processes and/or steps corresponding to the receiving device in the foregoing method embodiment, in order to avoid duplication, This will not be repeated here.
  • unit herein may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor for executing one or more software or firmware programs (eg, a shared processor, a proprietary processor, or a group). Processors, etc.) and memory, merge logic, and/or other suitable components that support the described functionality.
  • ASIC application specific integrated circuit
  • FIG. 14 shows a device 1300 for relay transmission according to an embodiment of the present invention.
  • the device 1300 includes:
  • the receiver 1310 is configured to receive a first layer 2 protocol data unit PDU that is sent by the sending end device to the receiving end device, where the first layer 2 PDU carries the identifier information of the remote terminal device, or the first layer 2 PDU is Scheduling the physical downlink control channel PDCCH that is scrambled by using the radio network temporary identifier RNTI of the remote terminal device;
  • the processor 1320 is configured to generate a second Layer 2 PDU according to the first Layer 2 PDU received by the receiver 1310.
  • the transmitter 1330 is configured to send the second layer 2 PDU generated by the processor 1320 to the receiver device.
  • the sending end device is the remote terminal device and the receiving end device is a network device, or the sending end device is a network device and the receiving end device is the remote terminal device.
  • apparatus 1300 may be specifically the relay terminal device in the foregoing embodiment, and may be used to perform various steps and/or processes corresponding to the relay terminal device in the foregoing method embodiments.
  • apparatus 1300 can also include a memory, which can include read only memory and random access memory, and provides instructions and data to the processor.
  • a portion of the memory may also include a non-volatile random access memory.
  • the memory can also store information of the device type.
  • the processor can be operative to execute instructions stored in the memory, and when the processor executes instructions stored in the memory, the processor is operative to perform various steps and/or processes of the method embodiments described above.
  • FIG. 15 is a schematic diagram of another relay transmission apparatus 1400 according to an embodiment of the present invention.
  • the apparatus 1400 includes:
  • the processor 1410 is configured to perform encapsulation processing on the data to be sent to the receiving device to generate a first Layer 2 protocol data unit PDU, where the first Layer 2 PDU carries the identifier information of the remote terminal device, or the first two
  • the layer PDU is scheduled by using a physical downlink control channel PDCCH that is scrambled by using a radio network temporary identifier RNTI of the remote terminal device;
  • the transceiver 1420 is configured to send the first layer 2 PDU generated by the processor 1410 to the relay terminal device.
  • the device 1400 is the remote terminal device and the receiving device is a network device, or the device 1400 is a network device and the receiving device is the remote terminal device.
  • apparatus 1400 may be specifically the sender device in the foregoing embodiment, and may be used to perform various steps and/or processes corresponding to the sender device in the foregoing method embodiment.
  • apparatus 1400 can also include a memory, which can include read only memory and random access memory, and provides instructions and data to the processor.
  • a portion of the memory may also include a nonvolatile SRAM.
  • the memory can also store information of the device type.
  • the processor can be operative to execute instructions stored in the memory, and when the processor executes instructions stored in the memory, the processor is operative to perform various steps and/or processes of the method embodiments described above.
  • FIG. 16 is a schematic diagram of another relay transmission device 1500 according to an embodiment of the present invention.
  • the device 1500 includes:
  • the transceiver 1510 is configured to receive a second layer 2 protocol data unit PDU that is sent by the relay terminal device, where the second layer 2 PDU is generated by the relay terminal device according to the first layer 2 PDU sent by the sending end device, where the The Layer 2 PDU carries the identification information of the remote terminal device, or the first Layer 2 PDU is scheduled by using the physical downlink control channel PDCCH that is scrambled by the radio network temporary identifier RNTI of the remote terminal device;
  • the processor 1520 is configured to determine the remote terminal device corresponding to the second layer 2 PDU received by the transceiver 1510.
  • the sending end device is the remote terminal device and the device 1500 is a network device, or the sending end device is a network device and the device 1500 is the remote terminal device.
  • apparatus 1500 may be specifically the receiving end device in the foregoing embodiment, and may be used to perform various steps and/or processes corresponding to the receiving end device in the foregoing method embodiment.
  • apparatus 1500 can also include a memory, which can include read only memory and random access memory, and provides instructions and data to the processor.
  • a portion of the memory may also include a non-volatile random access memory.
  • the memory can also store information of the device type.
  • the processor can be operative to execute instructions stored in the memory, and when the processor executes instructions stored in the memory, the processor is operative to perform various steps and/or processes of the method embodiments described above.
  • the processor may be a central processing unit (CPU), and the processor may also be other general purpose processors, digital signal processors (DSPs), and application specific integrated circuits (ASICs). ), off-the-shelf programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and the like.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory, and the processor executes the instructions in the memory, in combination with its hardware to perform the steps of the above method. To avoid repetition, it will not be described in detail here.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions.
  • a computer device which may be a personal computer, server, or network device, etc.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

本发明公开了一种中继传输的方法和装置，能够降低数据处理复杂度和时延，该方法包括：中继终端设备接收发送端设备向接收端设备发送的第一二层PDU，其中，该第一二层PDU携带远端终端设备的标识信息，或者该第一二层PDU是通过采用该远端终端设备的RNTI进行加扰的PDCCH调度的；该中继终端设备根据该第一二层PDU，生成第二二层PDU；该中继终端设备向该接收端设备发送该第二二层PDU；其中，该发送端设备为该远端终端设备且该接收端设备为网络设备，或该发送端设备为网络设备且该接收端设备为该远端终端设备。

Description

中继传输的方法和装置 技术领域
本发明实施例涉及通信领域，并且更具体地，涉及中继传输的方法和装置。
背景技术
设备到设备(Device-to-Device，D2D)技术是指邻近的终端设备可以在近距离范围内通过直连链路的方式进行数据传输，而不需要通过网络设备进行转发。D2D通信可以与蜂窝系统共享授权频带资源，形成统一的混合蜂窝-D2D网络。在该混合网络中，部分终端设备可以仍工作于蜂窝通信模式，即通过网络设备与其它终端设备通信，而部分终端设备可以工作于D2D通信模式，即通过与其它终端设备之间的直通链路与其它终端设备进行数据的直接传输。
此外，可以通过D2D中继辅助网络设备和终端设备之间的数据传输，此时，D2D中继与D2D终端之间采用D2D通信模式，而D2D中继和网络设备之间使用蜂窝通信模式。D2D中继使用半双工的方式接收和转发数据，并且在接收和转发的过程中进行模式转换。
现有技术中，D2D中继通过互联网协议(Internet Protocol，IP)层(即层3)中继D2D终端和网络设备之间的数据传输，对于接收到的数据包需要依次经过层1(即物理层)、层2(包括媒体访问控制(Media Access Control，MAC)层、无线链路控制(Radio Link Control，RLC)层和分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)层)和层3进行解封装处理，并依次经过层3、层2和层1的封装处理实现数据的中继，复杂度较高，数据处理时延较大。
发明内容
本发明实施例提供一种中继传输的方法和装置，能够降低中继传输的处理复杂度，降低数据时延。
第一方面，提供了一种中继传输的方法，包括：中继终端设备接收发送端设备向接收端设备发送的第一二层PDU，其中，该第一二层PDU携带远 端终端设备的标识信息，或者该第一二层PDU是通过采用该远端终端设备的RNTI进行加扰的PDCCH调度的；该中继终端设备根据该第一二层PDU，生成第二二层PDU；该中继终端设备向该接收端设备发送该第二二层PDU；其中，该发送端设备为该远端终端设备且该接收端设备为网络设备，或该发送端设备为网络设备且该接收端设备为该远端终端设备。
可选地，该中继终端设备的用于中继传输的用户面协议栈可以包括层一和层二，其中，层二可以仅包括MAC层，或者还可以包括RLC层和PDCP层中的至少一层。
可选地，该中继终端设备的用户面协议栈可以不包括层三(即IP层)。
可选地，该中继终端设备可以根据该远端终端设备的标识信息或RNTI，向该接收端设备转发该第一二层PDU中携带的数据。可选地，该接收端可以在层二根据该第一二层PDU，生成第二二层PDU，例如在层二对该第一二层PDU中携带的数据进行封装处理，得到第二二层PDU，并向接收端设备发送该第二二层PDU。
可选地，该中继终端设备可以根据该远端终端设备的标识信息或RNTI，确定该第一二层PDU对应的该远端终端设备，例如在层二识别该远端终端设备的标识信息，确定该第一二层PDU对应的该远端终端设备，并根据该远端终端设备，向该接收端设备转发该第一二层PDU中携带的数据，例如，该中继终端设备向该接收端设备发送的第二二层PDU携带该远端终端设备的标识信息，或者该第二二层PDU是采用该网络设备为该远端终端设备分配的上行传输资源发送的。可选地，该网络设备为该远端终端设备分配的上行传输资源可以是该网络设备根据该中继终端设备发送的该远端终端设备对应的前导码分配的，或者是该网络设备根据该中继终端设备发送的携带该远端终端设备的标识信息的BSR分配的。
在第一方面的第一种可能的实现方式中，该远端终端设备的标识信息包括该远端终端设备的层二标识或该远端终端设备的终端设备标识。
可选地，该中继终端设备可以在层二识别该远端终端设备的标识信息。
结合上述可能的实现方式，在第一方面的第二种可能的实现方式中，该远端终端设备的层二标识设置在下列层中的一种：MAC层、PDCP层和RLC层；或者，该远端终端设备和该网络设备的层二包括适配层，该适配层位于MAC层和PDCP层之间，并且该远端终端设备的层二标识设置在适配层。
此时，可选地，如果远端终端设备的标识信息(例如层二标识)设置在适配层，即在适配层进行封装和识别，该中继终端设备的层二可以包括适配层，并在适配层确定该第一二层PDU对应的远端终端设备。
或者，该中继终端设备的层二可以不包括适配层，此时，该中继终端设备可以在层二不识别该第一二层PDU所对应的远端终端设备，而直接对该第一二层PDU中携带的数据进行封装处理，生成第二二层PDU。可选地，该中继终端设备可以在向网络设备发送的第二二层PDU中携带中继特定逻辑信道标识，以使得该网络设备根据该中继特定逻辑信道标识确定该第二二层PDU中携带中继数据，并在适配层确定该第二二层PDU对应的远端终端设备；或者该中继终端设备可以采用用于中继传输的传输资源向远端终端设备发送该第二二层PDU，以使得该远端终端设备根据该传输资源，确定该第二二层PDU携带中继数据，并在适配层确定该第二二层PDU是否是发送给自己的。
结合上述可能的实现方式，在第一方面的第三种可能的实现方式中，若该发送端设备为该网络设备且该接收端设备为该远端终端设备，该远端终端设备的标识信息包括该远端终端设备的层二标识；该中继终端设备根据该第一二层PDU，生成第二二层PDU，包括：该中继终端设备确定与该层二标识对应的终端设备标识；该中继终端设备对该第一二层PDU中携带的数据进行封装处理，生成第二二层PDU，其中，该第二二层PDU携带该对应的终端设备标识。
结合上述可能的实现方式，在第一方面的第四种可能的实现方式中，若该发送端设备为该远端终端设备且该接收端设备为该网络设备，在该中继终端设备根据该第一二层PDU，生成第二二层PDU之前，该方法还包括：该中继终端设备确定与该远端终端设备的标识信息对应的前导码；该中继终端设备向该网络设备发送该前导码；该中继终端设备接收该网络设备根据该前导码发送的上行授权，该上行授权携带该网络设备分配的上行传输资源；该中继终端设备向该接收端设备发送该第二二层PDU，包括：该中继终端设备采用该上行传输资源向该网络设备发送该第二二层PDU。
结合上述可能的实现方式，在第一方面的第五种可能的实现方式中，若该发送端设备为该远端终端设备且该接收端设备为网络设备，在该中继终端设备向该接收端设备发送该第二二层PDU之前，该方法还包括：该中继终 端设备向该网络设备发送BSR，其中，该BSR中携带该远端终端设备的标识信息；该中继终端设备接收该网络设备根据该BSR发送的PDCCH，该PDCCH携带该远端终端设备的标识信息；该中继终端设备向该接收端设备发送该第二二层PDU，包括：该中继终端设备根据该PDCCH，向该网络设备发送该第二二层PDU。
该PDCCH可以携带上行授权。该中继终端设备可以根据该PDCCH中的上行授权，确定网络设备为该远端终端设备分配的上行传输资源，并采用该传输资源发送该第二二层PDU。
结合上述可能的实现方式，在第一方面的第六种可能的实现方式中，若该发送端设备为该远端终端设备且该接收端设备为网络设备，该远端终端设备的标识信息包括该远端终端设备的终端设备标识；该中继终端设备根据该第一二层PDU，生成第二二层PDU，包括：该中继终端设备确定与该终端设备标识对应的层二标识；该中继终端设备对该第一二层PDU中携带的数据进行封装处理，生成第二二层PDU，其中，该第二二层PDU携带该对应的层二标识。
结合上述可能的实现方式，在第一方面的第七种可能的实现方式中，该第一二层PDU和该第二二层PDU中通过D2D通信接口传输的PDU与该中继终端设备与该远端终端设备之间采用的D2D通信技术相对应，该第一二层PDU和该第二二层PDU中通过蜂窝通信接口传输的二层PDU具体为MAC PDU。
该D2D通信接口具体为该远端终端设备与中继终端设备之间的通信接口，例如，该D2D通信接口可以具体为PC5接口；该蜂窝通信接口为该中继终端设备与该网络设备之间的通信接口，例如，该蜂窝通信接口可以为Uu接口。
可选地，该蜂窝通信接口传输的PDU还可以具体为RLC PDU或PDCP PDU。
可选地，如果该D2D通信技术为LTE的旁路技术，则该通过PC5接口传输的PDU可以具体为MAC PDU、RLC PDU或PDCP PDU。可选地，如果该D2D通信技术为WLAN技术，则该通过PC5接口传输的PDU可以具体为WLAN中的相应层二的PDU。
结合上述可能的实现方式，在第一方面的第八种可能的实现方式中，该 远端终端设备的标识信息承载于MAC PDU的MAC控制元素字段中。
结合上述可能的实现方式，在第一方面的第九种可能的实现方式中，该第一二层PDU携带中继特定逻辑信道标识；在该中继终端设备根据该第一二层PDU，生成第二二层PDU之前，该方法还包括：该中继终端设备根据该中继特定逻辑信道标识，确定需要转发该第一二层PDU中携带的数据。
可选地，若该发送端设备为该远端终端设备且该接收端设备为网络设备，该第二二层PDU携带中继特定逻辑信道标识。网络设备可以根据该中继特定逻辑信道标识，确定该第二二层PDU中携带的数据是该中继终端设备转发的。
结合上述可能的实现方式，在第一方面的第十种可能的实现方式中，若该发送端设备为该远端终端设备且该接收端设备为网络设备，该第一二层PDU是该远端终端设备采用用于中继传输的传输资源发送的；在该中继终端设备根据该第一二层PDU，生成第二二层PDU之前，该方法还包括：该中继终端设备根据该传输资源，确定需要转发该第一二层PDU中携带的数据。
可选地，若该发送端设备为网络设备且该接收端设备为该远端终端设备，该中继终端设备可以通过中继传输的传输资源向该远端终端设备发送该第二二层PDU。该远端终端设备可以根据该第二二层PDU占用的传输资源，确定该第二二层PDU中携带的数据是中继终端设备转发的。
结合上述可能的实现方式，在第一方面的第十一种可能的实现方式中，若该发送端设备为该网络设备且该接收端设备为远端终端设备，该第一二层PDU是网络设备通过由中继特定RNTI加扰的PDCCH调度的；在该中继终端设备根据该第一二层PDU，生成第二二层PDU之前，该方法还包括：该中继终端设备根据用于调度该第一二层PDU的PDCCH采用的中继特定RNTI，确定需要转发该第一二层PDU中携带的数据。
此时，该中继终端设备接收到的该第一二层PDU是由该中继终端设备通过中继特定RNTI寻址的PDCCH调度的。
可选地，如果该接收端设备为网络设备并且该网络设备的层二包括适配层，该第二二层PDU可以携带中继特定逻辑信道标识，其中，该中继特定逻辑信道标识可以用于该网络设备确定该第二二层PDU是通过该中继终端设备转发的。
此时，可选地，该第二二层PDU可以不携带该远端终端设备的标识信 息。
结合上述可能的实现方式，在第一方面的第十二种可能的实现方式中，在该中继终端设备接收发送端设备发送的第一二层PDU之前，该方法还包括：该中继终端设备接收该远端终端设备的连接建立请求，该连接建立请求用于请求建立该中继终端设备与该远端终端设备之间的D2D通信链路；该中继终端设备根据该连接建立请求，向核心网设备发送承载建立请求，该承载建立请求携带该远端终端设备的终端设备标识，以便于该核心网设备与该网络设备建立该远端终端设备的演进分组系统EPS承载；该中继终端设备接收该网络设备发送的承载建立响应，该承载建立响应携带该网络设备为该远端终端设备建立的EPS承载的配置信息，其中，该EPS承载包括该网络设备与该中继终端设备之间的蜂窝数据传输通道以及该中继终端设备与该远端终端设备之间的D2D数据传输通道。
结合上述可能的实现方式，在第一方面的第十三种可能的实现方式中，该EPS承载的配置信息包括物理层配置信息和层二配置信息。
此时，该EPS承载的配置信息可以包括物理层配置信息和层二配置信息，其中，可选地，该层二配置信息可以包括层二中与中继传输相关的层的配置信息，例如，该层二配置信息可以包括层二中用于识别远端终端设备的标识信息的层的配置信息，例如MAC层配置信息。
可选地，该物理层配置信息可以包括用于中继传输的传输资源的信息和/或为该远端终端设备分配的RNTI和前导码中的至少一项，例如用于中继终端设备与远端终端设备之间进行中继传输的第一传输资源的信息，和/或用于中继终端设备与网络设备之间进行中继传输的第二传输资源的信息。
可选地，该层二配置信息可以包括该网络设备为该远端终端设备分配的层二标识和/或中继特定逻辑信道标识。
可选地，该方法还包括：该中继终端设备向该远端终端设备发送该第一传输资源的信息和/或层二标识。
结合上述可能的实现方式，在第一方面的第十四种可能的实现方式中，该EPS承载的配置信息还包括下列信息中的至少一种：PDCP层配置信息和RLC层配置信息；该方法还包括：向该远端终端设备发送该PDCP层配置信息和/或RLC层配置信息，以便于该远端终端设备根据该PDCP层配置信息和/或RLC层配置信息进行配置。
第二方面，提供了另一种中继传输的方法，包括：发送端设备对待向接收端设备发送的数据进行封装处理，生成第一二层协议数据单元PDU，其中，该第一二层PDU携带远端终端设备的标识信息，或者该第一二层PDU是通过采用远端终端设备的RNTI进行加扰的PDCCH调度的；该发送端设备向中继终端设备发送该第一二层PDU；其中，该发送端设备为该远端终端设备且该接收端设备为网络设备，或该发送端设备为网络设备且该接收端设备为该远端终端设备。
在第二方面的第一种可能的实现方式中，该远端终端设备的标识信息包括该远端终端设备的终端设备标识或该远端终端设备的层二标识。
结合上述可能的实现方式，在第二方面的第二种可能的实现方式中，该远端终端设备的层二标识设置在下列层中的一种：MAC层、PDCP层和RLC层；或者，该发送端设备的层二包括适配层，该适配层位于MAC层和PDCP层之间，并且该远端终端设备的层二标识设置在适配层。
结合上述可能的实现方式，在第二方面的第三种可能的实现方式中，若该发送端设备为网络设备，该第一二层PDU具体为MAC PDU；若该发送端设备为该远端终端设备，该第一二层PDU与该远端终端设备与该中继终端设备之间的D2D通信技术相对应。
结合上述可能的实现方式，在第二方面的第三种可能的实现方式中，该远端终端设备的标识信息承载于MAC PDU的MAC控制元素字段中。
结合上述可能的实现方式，在第二方面的第四种可能的实现方式中，该第一二层PDU携带中继特定逻辑信道标识，该中继特定逻辑信道标识用于该中继终端设备确定需要转发该第一二层PDU中携带的数据。
结合上述可能的实现方式，在第二方面的第五种可能的实现方式中，若该发送端设备为该远端终端设备，该发送端设备向中继终端设备发送该第一二层PDU，包括：该远端终端设备采用用于中继传输的传输资源向该中继终端设备发送该第一二层PDU。
结合上述可能的实现方式，在第二方面的第六种可能的实现方式中，若该发送端设备为网络设备，在该发送端设备向中继终端设备发送该第一二层PDU之前，该方法还包括：该发送端设备向该中继终端设备发送采用中继特定RNTI加扰的PDCCH，该PDCCH用于调度该第一二层PDU，其中，该中继特定RNTI用于该中继终端设备确定该第一二层PDU中携带的数据需 要转发。
结合上述可能的实现方式，在第二方面的第七种可能的实现方式中，若该发送端设备为网络设备，在该发送端设备生成第一二层PDU之前，该方法还包括：该网络设备接收承载建立请求，该承载建立请求携带该远端终端设备的终端设备标识；该网络设备根据该承载建立请求，建立该远端终端设备的EPS承载，其中，该EPS承载包括该网络设备与该中继终端设备之间的蜂窝数据传输通道以及该中继终端设备与该远端终端设备之间的D2D数据传输通道。
结合上述可能的实现方式，在第二方面的第八种可能的实现方式中，该EPS承载的配置信息包括MAC层配置信息和物理层配置信息；或者，该EPS承载的配置信息还进一步包括PDCP层配置信息和RLC层配置信息中的至少一种。
可选地，该物理层配置信息可以包括用于中继传输的传输资源的信息和/或为该远端终端设备分配的RNTI和前导码中的至少一项，例如用于中继终端设备与远端终端设备之间进行中继传输的第一传输资源的信息，和/或用于中继终端设备与网络设备之间进行中继传输的第二传输资源的信息。
可选地，该层二配置信息可以包括该网络设备为该远端终端设备分配的层二标识和/或中继特定逻辑信道标识。
第三方面，提供了另一种中继传输的方法，包括：接收端设备接收中继终端设备发送的第二二层协议数据单元PDU，该第二二层PDU是该中继终端设备根据发送端设备发送的第一二层PDU生成的，该第一二层PDU携带远端终端设备的标识信息，或者该第一二层PDU是通过采用远端终端设备的RNTI进行加扰的PDCCH调度的；该接收端设备确定该第二二层PDU对应的该远端终端设备；其中，该发送端设备为该远端终端设备且该接收端设备为网络设备，或该发送端设备为网络设备且该接收端设备为该远端终端设备。
在第三方面的第一种可能的实现方式中，该远端终端设备的标识信息包括：该远端终端设备的终端设备标识或该远端终端设备的层二标识。
结合上述可能的实现方式，在第三方面的第二种可能的实现方式中，该远端终端设备的层二标识设置在下列层中的一种：MAC层、PDCP层和RLC层；或者，该发送端设备和该接收端设备的层二包括适配层，该适配层位于 MAC层和PDCP层之间，并且该远端终端设备的层二标识设置在适配层。
结合上述可能的实现方式，在第三方面的第三种可能的实现方式中，若该接收端设备为该远端终端设备，该第二二层PDU携带该远端终端设备的终端设备标识；该接收端设备确定该第二二层PDU对应的该远端终端设备，包括：该接收端设备根据该第二二层PDU中携带的终端设备标识，确定该第二二层PDU对应的该远端终端设备。
结合上述可能的实现方式，在第三方面的第四种可能的实现方式中，若该接收端设备为该网络设备，在该接收端设备接收中继终端设备发送的第二二层PDU之前，该方法还包括：该网络设备接收该中继终端设备发送的该远端终端设备对应的前导码；该网络设备根据该前导码，向该中继终端设备发送上行授权，该上行授权携带该网络设备分配的上行传输资源；该接收端设备接收中继终端设备发送的第二二层PDU，包括：该网络设备接收该中继终端设备采用该上行传输资源发送的第二二层PDU；该接收端设备确定该第二二层PDU对应的该远端终端设备，包括：该中继终端设备根据该第二二层PDU所占用的上行传输资源，确定该第二二层PDU对应的该远端终端设备。
结合上述可能的实现方式，在第三方面的第五种可能的实现方式中，若该接收端设备为网络设备，在该接收端设备接收中继终端设备发送的第二二层PDU之前，该方法还包括：该网络设备接收该中继终端设备发送的BSR，其中，该BSR中携带该远端终端设备的标识信息；该网络设备根据该BSR，向该中继终端设备发送PDCCH，该PDCCH携带该远端终端设备的标识信息；该接收端设备确定该第二二层PDU对应的该远端终端设备，包括：该接收端设备根据用于调度该第二二层PDU的PDCCH，确定该第二二层PDU对应的该远端终端设备。
结合上述可能的实现方式，在第三方面的第六种可能的实现方式中，若该接收端设备为网络设备，该远端终端设备的标识信息包括该远端终端设备的终端设备标识，该第二二层PDU携带该远端终端设备的层二标识；该接收端设备确定该第二二层PDU对应的该远端终端设备，包括：该接收端设备根据该第二二层PDU中携带的层二标识，确定该第二二层PDU对应的该远端终端设备。
可选地，如果该接收端设备为网络设备并且该网络设备的层二包括适配 层，该第二二层PDU可以携带中继特定逻辑信道标识。此时，该网络设备可以根据该中继特定逻辑信道标识，确定该第二二层PDU是通过该中继终端设备转发的。
第四方面，提供了一种中继传输的装置，用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。具体地，该装置包括用于执行上述第一方面或第一方面的任意可能的实现方式中的方法的单元。
第五方面，提供了另一种中继传输的装置，用于执行上述第二方面或第二方面的任意可能的实现方式中的方法。具体地，该装置包括用于执行上述第二方面或第二方面的任意可能的实现方式中的方法的单元。
第六方面，提供了另一种中继传输的装置，用于执行上述第三方面或第三方面的任意可能的实现方式中的方法。具体地，该装置包括用于执行上述第三方面或第三方面的任意可能的实现方式中的方法的单元。
第七方面，提供了另一种中继传输的装置，包括：存储单元和处理器，该存储单元用于存储指令，该处理器用于执行该存储器存储的指令，并且当该处理器执行该存储器存储的指令时，该执行使得该处理器执行第一方面或第一方面的任意可能的实现方式中的方法。
第八方面，提供了另一种中继传输的装置，包括：存储单元和处理器，该存储单元用于存储指令，该处理器用于执行该存储器存储的指令，并且当该处理器执行该存储器存储的指令时，该执行使得该处理器执行第二方面或第二方面的任意可能的实现方式中的方法。
第九方面，提供了另一种中继传输的装置，包括：存储单元和处理器，该存储单元用于存储指令，该处理器用于执行该存储器存储的指令，并且当该处理器执行该存储器存储的指令时，该执行使得该处理器执行第三方面或第三方面的任意可能的实现方式中的方法。
第十方面，提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行第一方面或第一方面的任意可能的实现方式中的方法的指令。
第十一方面，提供了另一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行第二方面或第二方面的任意可能的实现方式中的方法的指令。
第十二方面，提供了另一种计算机可读介质，用于存储计算机程序，该 计算机程序包括用于执行第三方面或第三方面的任意可能的实现方式中的方法的指令。
第十三方面，提供了一种中继传输的系统，该系统包括中继终端设备、远端终端设备和网络设备，其中，该中继终端设备的用户面协议栈可以包括层一和层二，该远端终端设备的用户面协议栈可以包括层一、层二和层三，该网络设备的用户面协议栈可以包括层一、层二和层三，其中，该中继终端设备的层一分别与该远端终端设备的层一和该网络设备的层一为对等层，该中继终端设备的层二分别与该远端终端设备的层二和该网络设备的层二为对等层，并且该远端终端设备、该中继终端设备和网络设备之间可以以二层PDU的方式进行中继传输。
可选地，该中继终端设备的用户面协议栈可以仅包括层一和层二，而不包括层三，并且该中继终端设备的层二用于识别中继传输的远端终端设备。可选地，中继终端设备的层二可以用于对远端终端设备标识进行识别和封装，其中，该远端终端设备标识可以具体为远端终端设备的标识信息，例如远端终端设备的终端设备标识或层二标识。
可选地，该远端终端设备和网络设备的层二可以包括适配层，该适配层可以用于识别远端终端设备标识。可选地，该适配层可以位于该MAC层和PDCP层之间。
可选地，该中继终端设备可以为第四方面或第四方面的任意可能实现方式中的装置，该远端终端设备和网络设备中的发送端设备可以为第五方面或第五方面的任意可能的实现方式中的装置，该远端终端设备和网络设备中的接收端设备可以为第六方面或第六方面的任意可能的实现方式中的装置。
可选地，该中继终端设备可以为第七方面或第七方面的任意可能实现方式中的装置，该远端终端设备和网络设备中的发送端设备可以为第八方面或第八方面的任意可能的实现方式中的装置，该远端终端设备和网络设备中的接收端设备可以为第九方面或第九方面的任意可能的实现方式中的装置。
基于上述技术方案，本发明实施例提供的中继传输的方法和装置，通过中继终端设备采用层二中继的方式中继远端终端设备和网络设备之间的数据，其中，远端终端设备或网络设备向中继终端设备发送的二层PDU中携带远端终端设备的标识信息，或网络设备通过远端终端设备的RNTI对用于调度该二层PDU的PDCCH进行加扰，该中继终端设备可以根据该远端终 端设备的标识信息或RNTI，确定该二层PDU对应的远端终端设备，并对该二层PDU中携带的数据进行转发，与现有技术中中继终端设备采用层三中继的方式相比，能够降低中继终端设备的处理复杂度，降低中继数据的传输时延，提高系统整体性能。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对本发明实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例应用的无线通信系统的示意性流程图。
图2a是本发明实施例的各个设备的用于中继通信的用户面协议栈示例的示意图。
图2b是本发明实施例的各个设备的用于中继通信的另一用户面协议栈示例的示意图。
图3是本发明实施例提供的中继传输的方法的示意性流程图。
图4是本发明实施例提供的中继传输的方法中MAC PDU结构示例的示意图。
图5是本发明实施例提供的另一中继传输的方法的示意性流程图。
图6是本发明实施例提供的另一中继传输的方法的示意性流程图。
图7是本发明实施例提供的另一中继传输的方法的示意性流程图。
图8是本发明实施例提供的另一中继传输的方法的示意性流程图。
图9是本发明实施例提供的建立远端终端设备的承载的方法的示意性流程图。
图10是本发明实施例提供的另一建立远端终端设备的承载的方法的示意性流程图。
图11是本发明实施例提供的中继传输的装置的示意性框图。
图12是本发明实施例提供的另一中继传输的装置的示意性框图。
图13是本发明实施例提供的另一中继传输的装置的示意性框图。
图14是本发明实施例提供的另一中继传输的装置的示意性框图。
图15是本发明实施例提供的另一中继传输的装置的示意性框图。
图16是本发明实施例提供的另一中继传输的装置的示意性框图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明的一部分实施例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都应属于本发明保护的范围。
应理解，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
图1是本发明实施例的应用的无线通信系统100的示意图，该无线通信系统100包括可以包括至少一个网络设备110。网络设备100可以是与终端设备通信的设备。每个网络设备100可以为特定的地理区域提供通信覆盖，并且可以与位于该覆盖区域内的终端设备进行通信。该网络设备100可以是GSM系统或码分多址(Code Division Multiple Access，CDMA)系统中的基站(Base Transceiver Station，BTS)，也可以是WCDMA系统中的基站(NodeB，NB)，还可以是LTE系统中的演进型基站(Evolutional Node B，eNB或eNodeB)，或者是云无线接入网络(Cloud Radio Access Network，CRAN)中的无线控制器，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备、未来5G网络中的网络侧设备或者未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)中的网络设备等。
该无线通信系统100还包括位于网络设备110覆盖范围内的多个终端设备120。该终端设备120可以是移动的或固定的。该终端设备120可以指接入终端、用户设备(User Equipment，UE)、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。接入终端可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载 设备、可穿戴设备、未来5G网络中的终端设备或者未来演进的PLMN中的终端设备等。
图1示例性地示出了一个网络设备和六个终端设备，可选地，该无线通信系统100可以包括多个网络设备并且每个网络设备的覆盖范围内可以包括其它数量的终端设备，本发明实施例对此不做限定。此外，该无线通信系统100还可以包括移动管理实体(Mobile Management Entity，MME)、服务网关(Serving Gateway，S-GW)、分组数据网络网关(Packet Data Network Gateway，P-GW)等其他网络实体，但本发明实施例不限于此。
具体地，终端设备120可以以蜂窝通信模式或D2D通信模式进行通信，其中，在蜂窝通信模式中，终端设备可以通过网络设备与其它终端设备通信；在D2D通信模式中，终端设备可以通过D2D链路直接与其它终端设备通信。
在图1示出的多个终端设备120中，包括蜂窝终端设备、D2D终端设备和中继终端设备，其中，蜂窝终端设备采用蜂窝通信技术与网络设备110进行通信。D2D终端设备通过中继终端设备实现与网络设备之间的数据传输，其中，中继终端设备与D2D终端设备之间具有PC5接口，采用D2D通信技术进行通信，其中，该D2D通信技术可以具体为LTE中的旁路(SideLink，SL)技术，也可以为WLAN中的WIFI或蓝牙等技术，或者为其它D2D通信技术，本发明实施例对此不做限定。中继终端设备与网络设备之间具有Uu接口，采用蜂窝通信技术进行通信。
现有技术中，中继终端设备采用层三中继方式进行中继，数据处理时延较大。在本发明实施例中，中继终端设备可以采用层二中继的方式中继网络设备和D2D终端设备之间的数据传输，此时，在Uu接口和PC5接口都可以采用二层PDU(例如MAC PDU、RLC PDU或PDCP PDU)的方式进行中继传输。图2a和图2b分别示意性地示出了各个设备用于中继传输的用户面协议栈示例，其中，可选地，中继终端设备的用户面协议栈可以包括层一和层二，D2D终端设备的用户面协议栈可以包括层一、层二和层三，网络设备的用户面协议栈可以包括层一、层二和层三，其中，该中继终端设备的层一分别与该D2D终端设备的层一和该网络设备的层一为对等层，该中继终端设备的层二分别与该D2D终端设备的层二和该网络设备的层二为对等层。此时，D2D终端设备、中继终端设备和网络设备之间可以以二层PDU的方式进行中继传输。
此时，可选地，该中继终端设备的用户面协议栈可以仅包括层一和层二，而不包括层三。可选地，该中继终端设备的层二可以用于识别中继传输的远端终端设备。例如，中继终端设备的层二可以用于对D2D终端设备的标识信息进行识别和封装，但本发明实施例对此不做限定。
具体地，在图2a中，D2D终端设备和网络设备的用户面协议栈可以包括层一(即物理(Physics，PHY)层)、层二以及更高的层，其中，层二包括MAC层、RLC层和PDCP层。中继终端设备的用户面协议栈可以仅包括层一和层二，其中，层二可以仅包括MAC层，或仅包括MAC层和RLC层，或包括MAC层、RLC层和PDCP层。此时，该D2D终端设备、中继终端设备和网络设备之间的数据中继传输可以通过识别D2D终端设备的标识信息来实现中继传输，其中，该D2D终端设备的标识信息的识别可以在层二实现，但本发明实施例对此不做限定。
作为另一个可选实施例，在图2b中，D2D终端设备和网络设备的层二对等地新增了适配层。此时，D2D终端设备的协议栈可以包括PDCP层、RLC层、适配(ADPtive，ADP)层以及与PC5接口采用的D2D通信技术相对应的更下的层，其中，如果该D2D通信技术具体为LTE的旁路技术，则该更下的层可以具体为MAC层和PHY层，而如果该D2D通信技术为其它通信技术，例如，蓝牙或WIFI技术等等，则该更下的层可以为该其他通信技术中与MAC层和物理层相对应的层。中继终端设备的中继协议栈可以包括与该D2D通信技术相对应的层一和层二。网络设备的中继协议栈可以包括PDCP层、RLC层、ADP层、MAC层和PHY层。为了便于理解，以下实施例以MAC层和物理层为例进行描述，但本发明实施例不限于此。
可选地，该适配层可以位于MAC层和RLC层之间，也可以位于RLC层和PDCP之间，本发明实施例对此不做限定。在本发明实施例中，适配层可以用于识别D2D终端设备的标识信息，或可选的还可以用于识别用于指示中继传输的中继特定LCID。此外，可选地，该适配层可以用于将从下层接收到的采用各种D2D通信技术传输的数据转换成通信技术无关的形式，并且可选地将处理后的数据传输至上层进行进一步处理。可选地，该适配层可以携带D2D终端设备的层二标识，或进一步携带中继特定逻辑信道标识，其中，该中继特定逻辑信道标识可以用于识别中继数据。此时，可选地，中继终端设备通过Uu接口向网络设备发送的二层PDU可以不携带D2D终端 设备的任何信息，而通过中继特定逻辑信道标识来标识中继数据，但本发明实施例不限于此。
图3示意性地示出了本发明实施例提供的中继传输的方法200。该方法200可以应用于上述无线通信系统100，但本发明实施例不限于此。具体地，该方法200可以应用于上行数据的中继传输，即远端终端设备通过中继终端设备向网络设备传输上行数据，此时，发送端设备具体为远端终端设备(也可称为D2D终端设备)，接收端设备具体为网络设备。可选地，该方法200也可以应用于下行数据的中继传输，即网络设备通过中继终端设备向远端终端设备传输下行数据，此时，发送端设备为网络设备，接收端设备为远端终端设备，但本发明实施例对此不做限定。
S210，发送端设备对待发送数据或待发送信息进行封装处理，生成第一二层协议数据单元(Protocol Data Unit，PDU)。
应理解，在本发明实施例中，二层PDU可以指数据的最外层或最高层是在设备的层二进行封装的。可选地，层二可以包括MAC层、RLC层和PDCP层，相应地，该二层PDU可以具体指MAC PDU、RLC PDU或PDCP PDU。可选地，如果远端终端设备和网络设备的层二还包括适配层，则在PC5接口传输的二层PDU的具体形式可以与PC5接口采用的D2D通信技术相对应。例如，如果该D2D通信技术为LTE的旁路技术，则该PC5接口传输的二层PDU可以具体为MAC PDU，而如果该D2D通信技术为蓝牙或WIFI技术，则该PC5接口传输的二层PDU可以具体为蓝牙或WIFI技术中的与MAC PDU相对应的二层PDU，本发明实施例对此不做限定。
可选地，该第一二层PDU可以携带远端终端设备的标识信息，该远端终端设备的标识信息用于标识该远端终端设备，并且该远端终端设备的标识信息可以被该中继终端设备识别，例如，该中继终端设备能够通过层二识别远端终端设备的标识信息，但本发明实施例不限于此。可选地，该远端终设备的标识信息可以包括该远端终端设备的终端设备标识，该终端设备标识可以用于唯一地标识该远端终端设备。其中，该终端设备标识可以是预先定义的。例如该终端设备标识可以具体为该远端终端设备的设备标识或该远端终端设备的用户标识，等等。可选地，该远端终端设备的标识信息也可以包括该远端终端设备的特定标识，该远端终端设备的特定标识用于在中继传输中唯一地标识该远端终端设备。该特定标识可以是预定义的，也可以是网络设 备配置的。该特定标识的长度可以小于终端设备标识的长度，以降低信令开销。例如，该特定标识可以是层二标识，即在设备的层二进行封装和解析的标识，其中，该层二标识可以是预定义的，或者是网络设备为远端终端设备分配的，例如该层二标识是网络设备在为该远端终端设备建立承载的过程中为该远端终端设备分配的，但本发明实施例不限于此。可选地，该层二标识可以设置在PDCP层、RLC层或MAC层，即由PDCP层、RLC层或MAC层封装和解析。可选地，如果该远端终端设备和网络设备的层二还包括独立的适配层，则该层二标识可以设置在适配层或D2D通信技术的相应层，例如，如果中继终端设备与远端终端设备之间的PC5接口采用旁路技术，则该层二标识可以设置在MAC层，但本发明实施例对此不作限定。
如果远端终端设备和网络设备具有单独的适配层，并且由该适配层进行远端终端设备的标识信息的封装和解析，则当远端终端设备或网络设备有数据需要发送时，可以将数据依次进行PDCP层、RLC层和适配层封装。其中，可以在适配层中携带远端终端设备的标识信息(例如层二标识)，但本发明实施例不限于此。可选地，如果远端终端设备和网络设备不具有单独的适配层，并且由MAC层进行远端终端设备的标识信息的解析和封装，则当远端终端设备或网络设备有数据需要发送时，例如网络设备接收到来自网络侧的远端终端设备的数据，可以依次对数据进行PDCP层、RLC层和MAC层封装，其中，可以在MAC层携带该远端终端设备的标识信息(例如层二标识)，但本发明实施例不限于此。
S220，发送端设备向中继终端设备发送第一二层PDU。
可选地，该第一二层PDU可以包括逻辑信道标识(Logical Channel Identifier，LCID)字段或承载标识字段，该逻辑信道标识字段或承载标识字段的设置可以使得中继终端设备确定该第一二层PDU中携带的数据或信息需要转发，即确定该第二二层PDU中携带的数据为中继数据。例如，该承载标识字段可以用于携带该远端终端设备对应的承载标识，该逻辑信道标识字段可以用于携带中继特定LCID，以指示该第一二层PDU携带的数据为中继数据，需要该中继终端设备进行转发，其中，该中继特定LCID可以是预配置的，也可以是网络设备分配的，例如网络设备在为远端终端设备建立承载的过程中分配该中继特定LCID，但本发明实施例不限于此。
可选地，如果该发送端设备为远端终端设备且该接收端设备为网络设 备，则该远端终端设备可以通过用于中继传输的传输资源向该中继终端设备发送该第一二层PDU。此时，该中继终端设备可以根据该第一二层PDU所占用的传输资源，确定该第一二层PDU中携带的数据需要转发，但本发明实施例不限于此。
可选地，该中继终端设备还可以通过其它方式确定该第一二层PDU中携带的数据为中继数据，本发明实施例对此不做限定。
可选地，该中继终端设备可以根据该远端终端设备的标识信息或RNTI，向该接收端设备转发该第一二层PDU中携带的数据。具体地，该接收端设备可以对该第一二层PDU中携带的数据进行封装处理，例如在层二对该第一二层PDU中携带的数据进行封装处理，得到第二二层PDU，并向接收端设备发送该第二二层PDU，但本发明实施例不限于此。
S230，中继终端设备接收发送端设备发送的第一二层PDU，确定该第一二层PDU对应的远端终端设备，并且对该第一二层PDU中携带的数据进行封装处理，生成第二二层PDU。
可选地，该中继终端设备可以根据该第一二层PDU中携带的该远端终端设备的标识信息，确定该第一二层PDU对应的远端终端设备，例如，该中继终端设备可以在层二对该第一二层PDU中携带的标识信息进行识别，以确定该第一二层PDU对应的远端终端设备。或者，当该发送端设备为网络设备时，可选地，该第一二层PDU中携带的数据是网络设备通过物理下行控制信道(Physical Downlink Control Channel，PDCCH)调度的，其中，该PDCCH采用该远端终端设备的无线网络临时标识(Radio Network Temporary Identity，RNTI)加扰。此时，该中继终端设备可以根据用于调度该第一二层PDU的PDCCH所采用的RNTI，确定该第一二层PDU所对应的远端终端设备，但本发明实施例不限于此。
可选地，该远端终端设备的RNTI可以是预定义的，或者是网络设备为该远端终端设备分配的，例如，网络设备在为该远端终端设备建立承载的过程中为该远端终端设备分配RNTI。此时，该中继终端设备可以根据用于调度该第一二层PDU的PDCCH所采用的RNTI，确定该第一二层PDU所对应的该远端终端设备，但本发明实施例不限于此。
可选地，该中继终端设备可以对该第一二层PDU中携带的数据进行封装处理，生成第二二层PDU，例如，在层二对该第一二层PDU中携带的数 据进行封装处理，生成第二二层PDU。其中，该第一二层PDU可以满足该中继终端设备与发送端设备之间的接口通信协议，该第二二层PDU可以满足该中继终端设备与接收端设备之间的接口通信协议。
具体地，如果该远端终端设备和该网络设备不包括单独的适配层，则该中继终端设备可以对该第一二层PDU依次进行解封装和封装处理，以将第一接口的MAC PDU转换为第二接口的MAC PDU，其中，第一接口为该中继终端设备与发送端设备之间的通信接口，该第二接口为该中继终端设备与接收端设备之间的通信接口。例如，若发送端设备为远端终端设备且接收端设备为网络设备，则该第一接口为PC5接口，该第二接口为Uu接口。如果发送端设备为网络设备且接收端设备为远端终端设备，则该第一接口为Uu接口，该第二接口为PC5接口。例如，如果发送端设备为网络设备，则当该中继终端设备确定该第一二层PDU中携带的数据为中继数据时，可以根据PC5接口的通信技术对数据进行封装处理，得到满足PC5接口协议的第二二层PDU，并将其通过PC5接口的用户面(PC5-User Plane，PC5-U)发送。再例如，如果发送端设备为远端终端设备，则当该中继终端设备确定该第一二层PDU中携带的数据为中继数据时，可以根据Uu接口的通信技术对数据进行封装处理，以得到满足Uu接口协议的第二二层PDU(例如LTE Uu MAC PDU)。
可选地，该第二二层PDU可以携带该远端终端设备的标识信息，例如终端设备标识或层二标识。
具体地，如果该发送端设备为远端终端设备且接收端设备为网络设备，可选地，该第一二层PDU可以携带该远端终端设备的终端设备标识，此时，该中继终端设备可以确定与该终端设备标识对应的层二标识，并且在该第二二层PDU中携带该层二标识。该网络设备可以根据该第二二层PDU中携带的该远端终端设备的层二标识，确定该第二二层PDU对应的该远端终端设备，并向核心网设备(例如分组数据网网关(Packet Data Network Gateway，P-GW))发送该第二二层PDU中携带的数据。
可选地，在该中继终端设备向网络设备发送该第二二层PDU之前，该中继终端设备还可以发起上行授权请求流程，并且采用该网络设备分配的上行传输资源向该网络设备发送该第二二层PDU。其中，作为一个可选实施例，该中继终端设备可以按照中继终端设备需要向网络设备发送上行数据时发 起的上行授权请求流程进行，例如，该中继终端设备向网络设备发送调度请求，调度请求用于请求网络设备为该中继终端设备分配上行传输资源；该网络设备可以根据该调度请求，为该中继终端设备分配上行传输资源，并向该中继终端设备发送上行授权，该上行授权用于指示该网络设备为该中继终端设备分配的传输资源；该中继终端设备可以采用该上行传输资源向该网络设备发送该第二二层PDU。
作为另一个可选实施例，该中继终端设备可以确定该网络设备为该远端终端设备分配的前导码，并且通过向该网络设备发送该前导码发起上行授权请求流程。此时，该网络设备可以根据接收到的该前导码，确定分配的上行传输资源所对应的远端终端设备，并且在接收到该第二二层PDU之后，根据该第二二层PDU所占用的上行传输资源确定该远端终端设备。此时，该第二二层PDU中可以不携带该远端终端设备的标识信息，从而能够进一步节约信令开销。
作为另一个可选实施例，该中继终端设备可以向该网络设备发送缓存状态报告(Buffer Status Report，BSR)，其中，该BSR中携带该远端终端设备的标识信息，例如层二标识或终端设备标识，该网络设备在接收到该BSR之后，可以识别该远端终端设备的标识信息，并向该中继终端设备发送PDCCH，以调度该远端终端设备的上行数据传输，其中，该PDCCH携带该远端终端设备的标识信息。该中继终端设备在接收到该PDCCH之后，可以根据该PDCCH，向该网络设备发送该第二二层PDU。该网络设备可以根据用于调度该第二二层PDU的PDCCH，确定该第二二层PDU所对应的终端设备，此时，可选地，该中继终端设备发送的该第二二层PDU可以不携带该远端终端设备的标识信息，但本发明实施例不限于此。
如果该发送端设备为网络设备且接收端设备为远端终端设备，可选地，该第一二层PDU可以携带该远端终端设备的层二标识。此时，该中继终端设备可以确定与该层二标识对应的终端设备标识，并且在该第二二层PDU中携带该终端设备标识。当该远端终端设备接收到该第二二层PDU之后，可以根据该第二二层PDU携带的终端设备标识，确定该第二二层PDU是否是发送给自己的。此时，该远端终端设备与该中继终端设备之间的数据中继传输可以通过该远端终端设备的终端设备标识来识别该远端终端设备，而该中继终端设备与该网络设备之间的数据中继传输可以通过该远端终端设备 的层二标识来识别该远端终端设备，因此，该远端终端设备可以并不知道自身的层二标识，但本发明实施例不限于此。
可选地，该第二二层PDU还可以携带用于指示该第二二层PDU携带的数据为中继数据的指示信息，例如，如果该网络设备包括适配层，则该指示信息可以包括中继特定LCID。此时，网络设备可以根据该指示信息确定接收到的该第二二层PDU是通过中继终端设备进行中继的，但本发明实施例不限于此。
可选地，该第二二层PDU还可以携带该中继终端设备的标识信息，例如终端设备标识等等，但本发明实施例不限于此。
S240，中继终端设备向接收端设备发送该第二二层PDU。
该中继终端设备可以根据该第一二层PDU对应的远端终端设备，向该接收端设备转发该第一二层PDU中携带的数据，例如，该中继终端设备向该接收端设备发送的第二二层PDU携带该远端终端设备的标识信息，或者该第二二层PDU是采用该网络设备为该远端终端设备分配的上行传输资源发送的，但本发明实施例不限于此。
可选地，如果接收端设备为远端终端设备，则该中继终端设备可以采用用于中继传输的传输资源向该远端终端设备发送该第二二层PDU，该远端终端设备可以根据该第二二层PDU所占用的传输资源，确定该第二二层PDU携带中继数据，是中继终端设备转发的，但本发明实施例不限于此。
接收端设备在接收到该第二二层PDU之后，可以对该第二二层PDU进行解析处理。例如，如果接收端设备为网络设备并且该第二二层PDU中携带中继特定逻辑信道标识，则该网络设备可以通过该第二二层PDU中携带的中继特定逻辑信道标识，确定该第二二层PDU携带的数据为中继数据。可选地，该网络设备可以将该第二二层PDU中携带的数据通过S1-U接口传输至核心网。可选地，该网络设备还可以根据该第二二层PDU中携带的远端终端设备的标识信息，确定该第二二层PDU对应的远端终端设备，此时，如果该网络设备和核心网设备(例如P-GW)之间已经建立了该远端终端设备的数据传输通道，例如GPRS隧道协议(GPRS Tunneling Protocol，GTP)，则该网络设备可以通过该远端终端设备对应的GTP隧道向核心网设备发送该第二二层PDU中携带的数据，但本发明实施例不限于此。
再例如，如果接收端设备为远端终端设备并且该第二二层PDU是通过 用于进行中继传输的传输资源发送的，则该远端终端设备可以根据该第二二层PDU占用的传输资源，确定该第二二层PDU中携带的数据是该中继终端设备中继转发的。此外，可选地，该远端终端设备可以通过用于通过识别该第二二层PDU中携带的远端终端设备的标识信息，确定该第二二层PDU是否是发送给自己的。可选地，如果确定该第二二层PDU是发给自己的，则该远端终端设备可以对该第二二层PDU进一步进行解码处理，以获得该第二二层PDU中携带的数据。如果确定该第二二层PDU不是发给自己的，则该远端终端设备可以丢弃该第二二层PDU，但本发明实施例不限于此。
在本发明实施例中，该中继终端设备以层二中继的方式中继远端终端设备和网络设备之间的数据，例如，该中继终端设备以MAC中继的方式进行中继。此时，该中继终端设备与远端终端设备和网络设备之间可以均以MAC PDU的方式传输数据。可选地，MAC PDU可以携带远端终端设备的标识信息，例如远端终端设备的层二标识或终端设备标识。此时，该远端终端设备的标识信息可以承载于MAC PDU的MAC控制元素(Control Element，CE)中，该MAC CE可以为现有MAC CE或新增MAC CE，例如如图4所示，但本发明实施例不限于此。
表1  远端终端设备的层二标识与MAC CE中的比特之间的对应关系
Figure PCTCN2016077913-appb-000001
可选地，在进行中继传输之前，该网络设备还可以为该远端终端设备建立演进分组系统(Evovled Packet System，EPS)承载。其中，该EPS承载可以包括该网络设备与P-GW之间之间的数据传输通道(例如GTP隧道)以及该网络设备建立的无线承载，其中，该无线承载可以包括该网络设备与该中继终端设备之间的蜂窝数据传输通道以及该中继终端设备与该远端终端设备之间的D2D数据传输通道，但本发明实施例不限于此。
可选地，该中继终端设备可以接收该远端终端设备的连接建立请求，该连接建立请求用于请求建立该中继终端设备与该远端终端设备之间的D2D通信链路。可选地，该连接建立请求可以具体为直接通信请求，用于请求建 立与该中继终端设备之间的PC5连接。
该中继终端设备可以根据该连接建立请求，向核心网设备发送承载建立请求，该承载建立请求可以携带该远端终端设备的终端设备标识。可选地，该核心网设备可以为MME，该MME可以向P-GW发送该承载建立请求中携带的该远端终端设备的终端设备标识，以便于该P-GW与网络设备之间建立该远端终端设备的数据传输通道(例如GTP隧道)，并且该网络设备可以建立该远端终端设备的无线承载。
该中继终端设备可以接收该网络设备发送的承载建立响应，该承载建立响应携带该网络设备为该远端终端设备建立的EPS承载的配置信息，其中，可选地，该EPS承载的配置信息可以包括该无线承载的配置信息。该无线承载的配置信息可以包括层二配置信息(例如MAC层配置信息)和物理层配置信息。可选地，该EPS承载的配置信息还可以包括该远端终端设备与该网络设备的用户面对等层的配置信息，例如PDCP层配置信息和/或RLC层配置信息。可选地，该MAC层配置信息可以包括该网络设备为该远端终端设备分配的层二标识和/或中继特定LCID，该物理层配置信息可以包括下列中的至少一种：用于中继传输的传输资源的信息、为该远端终端设备分配的前导码和为该远端终端设备分配的RNTI，但本发明实施例不限于此。
可选地，该中继终端设备可以根据该承载建立响应，向该远端终端设备发送连接建立响应，可选地，该连接建立响应携带该物理层配置信息和该MAC层配置信息中的用于该中继终端设备与该远端终端设备进行中继传输的配置信息，例如层二标识和/或传输资源的信息，或者还可以进一步携带上述PDCP层配置信息和/或RLC层配置信息。可选地，如果该连接建立响应不携带PDCP层配置信息和/或RLC层配置信息，则该远端终端设备可以根据接收到的该中继终端设备的D2D广播消息，对PDCP层和/或RLC层进行配置；可选地，如果该连接建立响应携带PDCP层配置信息和/或RLC层配置信息，该远端终端设备可以根据该连接建立响应携带的RLC层配置信息和/或PDCP层配置信息中的至少一种，对层二进行配置，但本发明实施例不限于此。
因此，根据本发明实施例的中继传输的方法，通过中继终端设备采用层二中继的方式中继远端终端设备和网络设备之间的数据，其中，远端终端设备或网络设备向中继终端设备发送的二层PDU中携带远端终端设备的标识 信息，或网络设备通过远端终端设备的RNTI对用于调度该二层PDU的PDCCH进行加扰，该中继终端设备可以根据该远端终端设备的标识信息或RNTI，确定该二层PDU对应的远端终端设备，并对该二层PDU中携带的数据进行转发，与现有技术中中继终端设备采用层三中继的方式相比，能够降低中继终端设备的处理复杂度，降低中继数据的传输时延，提高系统整体性能。
下面将结合具体的例子详细描述本发明实施例。应注意，这些例子只是为了帮助本领域技术人员更好地理解本发明实施例，而非限制本发明实施例的范围。
为了便于描述，在下面的例子中假设蜂窝网络已经为远端终端设备建立了PDN连接和承载，假设远端终端设备具体为远端UE，中继终端设备具体为中继UE，网络设备具体为eNB，并且PC5接口的二层PDU和Uu接口的二层PDU均为MAC PDU，应理解，如果远端终端设备的层二包括适配层，PC5接口采用不同于LTE旁路技术的其它D2D通信技术，则该PC5接口的PDU可以为与该其它D2D通信技术对应的层二的PDU，但本发明实施例不限于此。
图5示意性地示出了本发明另一实施例提供的中继传输的方法300。该方法300可以应用于下行数据的中继传输。在方法300的中继传输过程中，采用远端终端设备的层二标识识别该远端终端设备。
S310，P-GW在接收到向远端终端设备发送的数据时，将数据通过在承载建立过程中分配的S1-U接口的GTP-U发送到eNB。
S320，eNB收到来自GTP-U的远端终端设备的数据之后，将数据封装为Uu接口的MAC PDU，其中，该Uu接口的MAC PDU中的MAC CE中携带远端终端设备的层二标识或终端设备标识。
S330，eNB可以通过中继特定RNTI寻址的PDCCH调度下行数据传输，并在物理下行数据信道(Physical Downlink Shared Channel，PDSCH)向中继终端设备传输该Uu接口的MAC PDU。
此时，可选地，该eNB可以通过中继特定RNTI对该PDCCH进行加扰，以指示该PDCCH用于调度中继数据传输。相应地，该中继终端设备可以根据该中继特定RNTI进行寻址，但本发明实施例不限于此。
S340，中继终端设备在接收到Uu接口的MAC PDU之后，可以解析出 该MAC PDU中携带的该远端终端设备的层二标识或终端设备标识，并且可以对数据进行封装处理，得到PC5接口的MAC PDU，其中，可选地，如果该远端终端设备知道自身的层二标识，则该PC5接口的MAC PDU可以携带该远端终端设备的层二标识。或者，该中继终端设备可以将该远端设备的层二标识与远端终端设备的终端设备标识进行关联，并且该PC5接口的MAC PDU可以携带该远端终端设备的终端设备标识，但本发明实施例不限于此。
S350，中继终端设备在用于中继传输的特定时频资源上发送该PC5接口的MAC PDU。
S360，远端终端设备在接收到PC5接口的MAC PDU之后，对该MAC PDU进行解析处理。如果该MAC PDU携带该远端终端设备自身的终端设备标识或层二标识，则将数据递交到高层进行进一步处理；否则，该远端终端设备丢弃该MAC PDU。
图6示意性地示出了本发明另一实施例提供的中继传输的方法400。该方法400可以应用于下行数据的中继传输。在方法400的中继传输过程中，采用远端终端设备的RNTI识别该远端终端设备。
S410与S310相同，具体可以参考上述实施例的描述，为了简洁，这里不再赘述。
S420，eNB收到来自GTP-U的远端终端设备的数据之后，将数据封装为Uu接口的MAC PDU。
可选地，该Uu接口的MAC PDU可以不携带该远端UE的标识信息。
S430，eNB可以通过PDCCH调度中继终端设备的下行数据传输，并在PDSCH向中继终端设备传输该Uu接口的MAC PDU，其中，该PDCCH是采用该远端终端设备的RNTI加扰的。
此时，该中继终端设备可以通过远端终端设备的上述RNTI进行寻址，但本发明实施例不限于此。该远端终端设备的RNTI可以用于在中继传输过程中识别该远端终端设备。该远端终端设备的RNTI可以是预定义的，也可以是网络设备为该远端终端设备分配的，例如在承载建立过程中分配的，但本发明实施例不限于此。
S440，中继终端设备在接收到Uu接口的MAC PDU之后，可以根据用于调度该MAC PDU的PDCCH所采用的RNTI，确定该MAC PDU对应的 该远端终端设备，并且将该Uu接口的MAC PDU中携带的数据封装PC5接口的MAC PDU，其中，该PC5接口的MAC PDU可以携带与远端终端设备的RNTI相关联的终端设备标识或层二标识。
S450～S460与S350～S360相同，具体可以参考上述实施例的描述，为了简洁，这里不再赘述。
图7示意性地示出了本发明另一实施例提供的中继传输的方法500。该方法500可以应用于上行数据的中继传输。在方法500的中继传输过程中，采用远端终端设备的层二标识或终端设备标识来识别该远端终端设备。
S510，当远端终端设备有数据待发送到蜂窝网络时，远端终端设备将数据封装为MAC PDU，其中，该MAC PDU携带该远端终端设备的终端设备标识或层二标识。
S520，远端终端设备通过PC5接口在用于中继传输的时频资源上发送该MAC PDU。
S530，中继终端设备在接收到来自远端终端设备的MAC PDU之后，解析PC5接口的MAC PDU，并根据该PC5接口的MAC PDU中携带的终端设备标识或层二标识封装Uu接口的MAC PDU，其中，Uu接口的MAC PDU携带网络设备为该远端终端设备分配的层二标识或终端设备标识。
可选地，在S540中，该中继终端设备可以发起上行授权请求。
可选地，该中继终端设备可以通过现有流程发起上行授权请求流程，但本发明实施例不限于此。
S550，中继终端设备采用eNB在上行授权过程中分配的上行传输资源将Uu接口的MAC PDU发送至eNB。
S560，eNB解析Uu接口的MAC PDU，以识别远端终端设备的层二标识或终端设备标识。
S570，eNB通过S1接口将该MAC PDU中携带的数据在与该层二标识或终端设备标识对应的GTP-U传输至P-GW。
图8示意性地示出了本发明另一实施例提供的中继传输的方法600。该方法600可以应用于上行数据的中继传输。
S610～S620与S510～S520相同，具体可以参见上述实施例的描述，为了简洁，这里不再赘述。
S630，中继终端设备接收到来自远端终端设备的MAC PDU之后，解析 接收到的PC5接口的该MAC PDU，以确定该MAC PDU对应的远端终端设备，并将该PC5接口的该MAC PDU封装为Uu接口的MAC PDU。
S640，中继终端设备根据PC5接口的MAC PDU中携带的远端终端设备的终端设备标识或层二标识，确定网络设备为该远端终端设备配置的前导码，并采用该前导码发起上行授权请求流程。eNB在收到中继终端设备的该前导码之后，可以根据该前导码为远端终端设备的数据分配上行传输资源。
可选地，网络设备可以在为该远端终端设备建立承载的过程中为该远端终端设备分配该前导码。该中继终端设备在接收到该网络设备分配的该前导码之后，可以将该前导码与该远端终端设备的标识信息关联，但本发明实施例不限于此。
S650，中继终端设备可以采用eNB在上行授权过程中分配的上行传输资源将Uu接口的MAC PDU发送至eNB。
S660～S670与S560～S570相同，具体可以参见上述实施例的描述，为了简洁，这里不再赘述。
在本实施例中，中继终端设备采用远端终端设备对应的前导码请求上行授权。该eNB在接收到该前导码之后，可以确定该前导码对应的远端终端设备，并为该中继终端设备分配上行传输资源，此时，该eNB可以将该远端终端设备与该上行传输资源相关联。然后，当eNB接收到Uu接口的MAC PDU之后，可以根据该上行传输资源，确定该Uu接口的MAC PDU所对应的远端终端设备。此时，该Uu接口的MAC PDU可以不携带该远端终端设备的标识信息，从而进一步降低信令开销。
图9示意性地示出了本发明实施例提供的建立承载的方法700。在该方法700中，假设该远端终端设备已经附着到蜂窝网络(例如演进型陆地无线接入网(Evolved Universal Terrestrial Radio Access Network，E-UTRAN)，或者该远端终端设备已经与蜂窝网络建立了PDN连接，但本发明实施例不限于此。
S710，远端终端设备发现中继终端设备并且驻留。
S720，远端终端设备向中继终端设备发送直接通信请求(Direct Communication Request)，其中，该直接通信请求可以携带该远端终端设备的终端设备标识和该远端终端设备的PDN连接的IP地址。
该直接通信请求可以具体用于建立该远端终端设备与该中继终端设备 之间的D2D通信链路，例如，该远端终端设备与该中继终端设备之间的PC5连接，但本发明实施例不限于此。
S730，中继终端设备在接收到远端终端设备发送的直接通信请求之后，向MME上报该远端终端设备的终端设备标识和PDN连接的IP地址。
S740，MME可以存储该终端设备标识和IP地址，并将其传输至S-GW/P-GW。
S750，MME和S-GW为该远端终端设备分配S1-U接口的GTP隧道，例如隧道端点标识符(Tunnel Endpoint Identifier，TEID)等。
S760，eNB为远端终端设备分配无线承载，其中，可以包括为该远端终端设备分配的层二标识和/或RNTI。
该无线承载可以包括该接入网设备与该中继终端设备之间的蜂窝数据传输通道以及该中继终端设备与该远端终端设备之间的D2D数据传输通道。可选地，该无线承载的配置信息可以包括物理层配置信息和MAC层配置信息，可选地，该物理层配置信息可以包括为该远端终端设备分配前导码，但本发明实施例不限于此。
S770，中继终端设备向远端终端设备发送直接通信响应。
可选的，该直接通信响应可以携带无线资源控制(Radio Resource Control，RRC)容器，该RRC容器可以封装有RLC层配置和/或PDCP层配置。相应地，该远端终端设备在接收直接通信响应之后，可以根据该直接通信响应中的RRC配置，配置相应的RLC层和/或PDCP层。可选地，该直接通信响应还可以携带该网络设备为远端终端设备分配的层二标识，但本发明实施例不限于此。
图10示意性地示出了本发明实施例提供的另一建立承载的方法800。在该方法800中，假设远端终端设备还未建立默认的PDN连接。
S810，远端终端设备发现中继终端设备并且驻留。
S820，远端终端设备向中继终端设备发送直接通信请求，该直接通信请求可以携带远端终端设备的终端设备标识和用于请求建立PDN连接的指示信息。
此时，该直接通信请求可以用于请求建立该远端终端设备与该中继终端设备之间的PC5连接，并且可选地还用于请求建立该远端终端设备与蜂窝网络之间的PDN连接。
S830，中继终端设备可以根据该直接通信请求，向MME发送PDN连接建立请求，请求建立远端终端设备的PDN连接。可选地，该PDN连接建立请求可以携带远端终端设备的终端设备标识。
S840，核心网设备(MME或S-GW/P-GW)为远端终端设备创建PDN连接并且为该远端终端设备分配IP地址。
S850，MME向中继终端设备发送PDN连接建立响应，该PDN连接建立响应携带PDN连接的配置信息，例如IP地址等。
S860，MME为远端终端设备分配S1-U GTP隧道，例如TEID等。
S870，eNB为远端终端设备分配中继终端设备与eNB之间的无线承载，其中可以包括为该远端终端设备分配的层二标识和/或RNTI。
S880，中继终端设备向远端终端设备发送直接通信响应。
可选的，该直接通信响应可以携带RRC容器，该RRC容器可以封装有RLC层配置和/或PDCP层配置。相应地，该远端终端设备在接收直接通信响应之后，可以根据该直接通信响应中的RRC配置，配置相应的RLC层和/或PDCP层。可选地，该直接通信响应还可以携带该网络设备为远端终端设备分配的层二标识，但本发明实施例不限于此。
应注意，图5至图10的例子是为了帮助本领域技术人员更好地理解本发明实施例，而非要限制本发明实施例的范围。本领域技术人员根据所给出的图5至图10的例子，显然可以进行各种等价的修改或变化，这样的修改或变化也落入本发明实施例的范围内。
应理解，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
上文中结合图2至图10，详细描述了根据本发明实施例的中继传输的方法，下面将结合图11至图16，详细描述根据本发明实施例的中继传输的装置。
图11示出了本发明实施例提供的中继传输的装置900，该装置900包括：
接收单元910，用于接收发送端设备向接收端设备发送的第一二层协议数据单元PDU，其中，该第一二层PDU携带远端终端设备的标识信息，或者该第一二层PDU是通过采用该远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
处理单元920，用于根据该接收单元910接收的该第一二层PDU，生成第二二层PDU；
发送单元930，用于向该接收端设备发送该处理单元920生成的该第二二层PDU；
其中，该发送端设备为该远端终端设备且该接收端设备为网络设备，或该发送端设备为网络设备且该接收端设备为该远端终端设备。
可选地，该远端终端设备的标识信息包括该远端终端设备的终端设备标识或该远端终端设备的层二标识。
可选地，若该发送端设备为该网络设备且该接收端设备为该远端终端设备，该远端终端设备的标识信息包括该远端终端设备的层二标识。此时，该处理单元920具体用于：确定与该层二标识对应的终端设备标识，以及对该第一二层PDU中携带的数据进行封装处理，生成第二二层PDU，其中，该第二二层PDU携带该对应的终端设备标识。
可选地，若该发送端设备为该远端终端设备且该接收端设备为该网络设备，该处理单元920还用于在根据该第一二层PDU，生成第二二层PDU之前，确定与该远端终端设备的标识信息对应的前导码；
该发送单元930还用于向该网络设备发送该处理单元920确定的该前导码；
该接收单元910还用于接收该网络设备根据该前导码发送的上行授权，该上行授权指示该网络设备分配的上行传输资源；
该发送单元930具体用于采用该接收单元910接收的该上行授权指示的上行传输资源向该网络设备发送该第二二层PDU。
可选地，若该发送端设备为该远端终端设备且该接收端设备为网络设备，该发送单元930还用于在向该接收端设备发送该第二二层PDU之前，向该网络设备发送缓存状态报告BSR，其中，该BSR中携带该远端终端设备的标识信息；
该接收单元910还用于接收该网络设备根据该BSR发送的PDCCH，该PDCCH携带该远端终端设备的标识信息；
该发送单元930具体用于根据该接收单元910接收的该PDCCH，向该网络设备发送该第二二层PDU。
可选地，若该发送端设备为该远端终端设备且该接收端设备为网络设 备，该远端终端设备的标识信息包括该远端终端设备的终端设备标识。此时，该处理单元920具体用于：确定与该终端设备标识对应的层二标识，以及对该第一二层PDU中携带的数据进行封装处理，生成第二二层PDU，其中，该第二二层PDU携带该对应的层二标识。
可选地，如果该发送端设备为网络设备且该接收端设备为该远端终端设备，该第一二层PDU携带中继特定逻辑信道标识。此时，该处理单元920还用于在根据该第一二层PDU，生成第二二层PDU之前，根据该中继特定逻辑信道标识，确定需要转发该第一二层PDU中携带的数据。
可选地，若该发送端设备为该远端终端设备且该接收端设备为网络设备，该第二二层PDU携带中继特定逻辑信道标识。网络设备可以根据该中继特定逻辑信道标识，确定该第二二层PDU中携带的数据是该中继终端设备转发的。
可选地，若该发送端设备为该远端终端设备且该接收端设备为网络设备，该第一二层PDU是该远端终端设备采用用于中继传输的传输资源发送的。此时，该处理单元920还用于在根据该第一二层PDU，生成第二二层PDU之前，根据该传输资源，确定需要转发该第一二层PDU中携带的数据。
可选地，若该发送端设备为网络设备且该接收端设备为该远端终端设备，该发送单元930可以具体用于通过中继传输的传输资源向该远端终端设备发送该第二二层PDU。该远端终端设备可以根据该第二二层PDU占用的传输资源，确定该第二二层PDU中携带的数据是中继终端设备转发的。
可选地，若该发送端设备为该网络设备且该接收端设备为远端终端设备，该第一二层PDU是网络设备通过由中继特定RNTI加扰的物理下行控制信道PDCCH调度的。此时，该处理单元920还用于在根据该第一二层PDU，生成第二二层PDU之前，根据用于调度该第一二层PDU的PDCCH采用的中继特定RNTI，确定需要转发该第一二层PDU中携带的数据。
可选地，该接收单元910还用于在接收发送端设备发送的第一二层PDU之前，接收该远端终端设备的连接建立请求，该连接建立请求用于请求建立该中继终端设备与该远端终端设备之间的D2D通信链路；该发送单元930还用于根据该连接建立请求，向核心网设备发送承载建立请求，该承载建立请求携带该远端终端设备的终端设备标识，以便于该核心网设备与该网络设备建立该远端终端设备的EPS承载；该接收单元910还用于接收该网络设备 发送的承载建立响应，该承载建立响应携带该网络设备为该远端终端设备建立的EPS承载的配置信息，其中，该EPS承载包括该网络设备与该中继终端设备之间的蜂窝数据传输通道以及该中继终端设备与该远端终端设备之间的D2D数据传输通道。
可选地，该EPS承载的配置信息包括MAC层配置信息和物理层配置信息。此时，该发送单元930还用于向该远端终端设备发送连接建立响应，该连接建立响应携带该物理层配置信息和该MAC层配置信息。
在一个可选例子中，装置900可以具体为上述实施例中的中继终端设备，装置900可以用于执行上述方法实施例中与中继终端设备对应的各个流程和/或步骤，为避免重复，在此不再赘述。
图12示意性地使出了本发明实施例提供的另一中继传输的装置1100，该装置1100包括：
处理单元1110，用于对待向接收端设备发送的数据进行封装处理，生成第一二层协议数据单元PDU，其中，该第一二层PDU携带远端终端设备的标识信息，或者该第一二层PDU是通过采用远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
发送单元1120，用于向中继终端设备发送该处理单元1110生成的该第一二层PDU；
其中，该装置1100为该远端终端设备且该接收端设备为网络设备，或该装置1100为网络设备且该接收端设备为该远端终端设备。
可选地，该远端终端设备的标识信息包括该远端终端设备的终端设备标识或该远端终端设备的层二标识。
可选地，该第一二层PDU携带中继特定逻辑信道标识，该中继特定逻辑信道标识用于该中继终端设备确定需要转发该第一二层PDU中携带的数据。
可选地，若该装置1100为该远端终端设备，该发送单元1120具体用于采用用于中继传输的传输资源向该中继终端设备发送该第一二层PDU。
可选地，若该装置1100为该网络设备，该发送单元1120还用于在向中继终端设备发送该第一二层PDU之前，向该中继终端设备发送采用中继特定RNTI加扰的PDCCH，该PDCCH用于调度该第一二层PDU，其中，该中继特定RNTI用于该中继终端设备确定该第一二层PDU中携带的数据需 要转发。
可选地，若该装置1100为网络设备，该装置1100还包括：
接收单元，用于在该处理单元1110生成第一二层PDU之前，接收承载建立请求，该承载建立请求携带该远端终端设备的终端设备标识；
该处理单元1110还用于根据该接收单元接收的该承载建立请求，建立该远端终端设备的EPS承载，其中，该EPS承载包括该网络设备与该中继终端设备之间的蜂窝数据传输通道以及该中继终端设备与该远端终端设备之间的D2D数据传输通道；
该发送单元1120还用于向该中继终端设备发送承载建立响应，该承载建立响应携带该EPS承载的配置信息。
可选地，该EPS承载的配置信息可以包括MAC层配置信息和物理层配置信息。或者还可以进一步包括PDCP层配置信息和/或RLC层配置信息。
在一个可选例子中，装置1100可以具体为上述实施例中的发送端设备，装置1100可以用于执行上述方法实施例中与发送端设备对应的各个流程和/或步骤，为避免重复，在此不再赘述。
图13示意性示出了本发明实施例提供的另一中继传输的装置1200，该装置1200包括：
接收单元1210，用于接收中继终端设备发送的第二二层协议数据单元PDU，该第二二层PDU是该中继终端设备根据发送端设备发送的第一二层PDU生成的，该第一二层PDU携带远端终端设备的标识信息，或者该第一二层PDU是通过采用远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
处理单元1220，用于确定该接收单元1210接收的该第二二层PDU对应的该远端终端设备；
其中，该发送端设备为该远端终端设备且该装置1200为网络设备，或该发送端设备为网络设备且该装置1200为该远端终端设备。
可选地，该远端终端设备的标识信息包括：该远端终端设备的终端设备标识或该远端终端设备的层二标识。
可选地，若该装置1200为该远端终端设备，该第二二层PDU携带该远端终端设备的终端设备标识。此时，该处理单元1220具体用于根据该第二二层PDU中携带的终端设备标识，确定该第二二层PDU对应的该远端终端 设备。
可选地，若该装置1200为该网络设备，该接收单元1210还用于在接收中继终端设备发送的第二二层PDU之前，接收该中继终端设备发送的该远端终端设备对应的前导码。此时，该装置1200还包括：发送单元，用于根据该接收单元1210接收的该前导码，向该中继终端设备发送上行授权，该上行授权指示该网络设备分配的上行传输资源；
该接收单元1210具体用于接收该中继终端设备采用该发送单元发送的上行授权指示的该上行传输资源发送的第二二层PDU；
该处理单元1220具体用于根据该第二二层PDU所占用的上行传输资源，确定该第二二层PDU对应的该远端终端设备。
可选地，若该装置1200为网络设备，该接收单元1210还用于在接收中继终端设备发送的第二二层PDU之前，接收该中继终端设备发送的缓存状态报告BSR，其中，该BSR中携带该远端终端设备的标识信息。此时，该装置1200还包括：发送单元，用于根据该接收单元1210接收的该BSR，向该中继终端设备发送PDCCH，该PDCCH携带该远端终端设备的标识信息；
该处理单元1220具体用于根据用于调度该第二二层PDU的PDCCH，确定该第二二层PDU对应的该远端终端设备。
可选地，若该装置1200为网络设备，该远端终端设备的标识信息包括该远端终端设备的终端设备标识，该第二二层PDU携带该远端终端设备的层二标识。此时，该处理单元1220具体用于根据该第二二层PDU中携带的层二标识，确定该第二二层PDU对应的该远端终端设备。
在一个可选例子中，装置1200可以具体为上述实施例中的接收端设备，装置1200可以用于执行上述方法实施例中与接收端设备对应的各个流程和/或步骤，为避免重复，在此不再赘述。
应理解，上述装置900、装置1100和装置1200均以功能单元的形式体现。这里的术语“单元”可以指应用特有集成电路(Application Specific Integrated Circuit，ASIC)、电子电路、用于执行一个或多个软件或固件程序的处理器(例如共享处理器、专有处理器或组处理器等)和存储器、合并逻辑电路和/或其它支持所描述的功能的合适组件。
图14示出了本发明实施例提供的中继传输的装置1300，该装置1300包括：
接收器1310，用于接收发送端设备向接收端设备发送的第一二层协议数据单元PDU，其中，该第一二层PDU携带远端终端设备的标识信息，或者该第一二层PDU是通过采用该远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
处理器1320，用于根据该接收器1310接收的该第一二层PDU，生成第二二层PDU；
发送器1330，用于向该接收端设备发送该处理器1320生成的该第二二层PDU；
其中，该发送端设备为该远端终端设备且该接收端设备为网络设备，或该发送端设备为网络设备且该接收端设备为该远端终端设备。
应理解，装置1300可以具体为上述实施例中的中继终端设备，并且可以用于执行上述方法实施例中与中继终端设备对应的各个步骤和/或流程。可选地，装置1300还可以包括存储器，该存储器可以包括只读存储器和随机存取存储器，并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如，存储器还可以存储设备类型的信息。处理器可以用于执行存储器中存储的指令，并且当该处理器执行存储器中存储的指令时，该处理器用于执行上述方法实施例的各个步骤和/或流程。
图15示意性地使出了本发明实施例提供的另一中继传输的装置1400，该装置1400包括：
处理器1410，用于对待向接收端设备发送的数据进行封装处理，生成第一二层协议数据单元PDU，其中，该第一二层PDU携带远端终端设备的标识信息，或者该第一二层PDU是通过采用远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
收发器1420，用于向中继终端设备发送该处理器1410生成的该第一二层PDU；
其中，该装置1400为该远端终端设备且该接收端设备为网络设备，或该装置1400为网络设备且该接收端设备为该远端终端设备。
应理解，装置1400可以具体为上述实施例中的发送端设备，并且可以用于执行上述方法实施例中与发送端设备对应的各个步骤和/或流程。可选地，装置1400还可以包括存储器，该存储器可以包括只读存储器和随机存取存储器，并向处理器提供指令和数据。存储器的一部分还可以包括非易失 性随机存取存储器。例如，存储器还可以存储设备类型的信息。处理器可以用于执行存储器中存储的指令，并且当该处理器执行存储器中存储的指令时，该处理器用于执行上述方法实施例的各个步骤和/或流程。
图16示意性示出了本发明实施例提供的另一中继传输的装置1500，该装置1500包括：
收发器1510，用于接收中继终端设备发送的第二二层协议数据单元PDU，该第二二层PDU是该中继终端设备根据发送端设备发送的第一二层PDU生成的，该第一二层PDU携带远端终端设备的标识信息，或者该第一二层PDU是通过采用远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
处理器1520，用于确定该收发器1510接收的该第二二层PDU对应的该远端终端设备；
其中，该发送端设备为该远端终端设备且该装置1500为网络设备，或该发送端设备为网络设备且该装置1500为该远端终端设备。
应理解，装置1500可以具体为上述实施例中的接收端设备，并且可以用于执行上述方法实施例中与接收端设备对应的各个步骤和/或流程。可选地，装置1500还可以包括存储器，该存储器可以包括只读存储器和随机存取存储器，并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如，存储器还可以存储设备类型的信息。处理器可以用于执行存储器中存储的指令，并且当该处理器执行存储器中存储的指令时，该处理器用于执行上述方法实施例的各个步骤和/或流程。
应理解，在本发明实施例中，该处理器可以是中央处理单元(Central Processing Unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现成可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本发明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。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该 存储介质位于存储器，处理器执行存储器中的指令，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
应理解，为避免重复，本文对实施例的描述着重于强调各个实施例之间的不同之处，其相同或相似之处可以相互参考。
本领域普通技术人员可以意识到，结合本文中所公开的实施例中描述的各方法步骤和单元，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各实施例的步骤及组成。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。本领域普通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发明的范围。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另外，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，也可以是电的，机械的或其它的形式连接。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本发明实施例方案的目的。
另外，在本发明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，也可以是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。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解， 本发明的技术方案本质上或者说对现有技术做出贡献的部分，或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到各种等效的修改或替换，这些修改或替换都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以权利要求的保护范围为准。

Claims (68)

  1. 一种中继传输的方法，其特征在于，包括：
    中继终端设备接收发送端设备向接收端设备发送的第一二层协议数据单元PDU，其中，所述第一二层PDU携带远端终端设备的标识信息，或者所述第一二层PDU是通过采用所述远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
    所述中继终端设备根据所述第一二层PDU，生成第二二层PDU；
    所述中继终端设备向所述接收端设备发送所述第二二层PDU；
    其中，所述发送端设备为所述远端终端设备且所述接收端设备为网络设备，或所述发送端设备为网络设备且所述接收端设备为所述远端终端设备。
  2. 根据权利要求1所述的方法，其特征在于，所述远端终端设备的标识信息包括所述远端终端设备的层二标识或所述远端终端设备的终端设备标识。
  3. 根据权利要求2所述的方法，其特征在于，所述远端终端设备的层二标识设置在下列层中的一种：媒体访问控制MAC层、分组数据汇聚协议PDCP层和无线链路控制RLC层；或者，
    所述远端终端设备和所述网络设备的层二包括适配层，所述适配层位于MAC层和PDCP层之间，并且所述远端终端设备的层二标识设置在适配层。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，若所述发送端设备为所述网络设备且所述接收端设备为所述远端终端设备，所述远端终端设备的标识信息包括所述远端终端设备的层二标识；
    所述中继终端设备根据所述第一二层PDU，生成第二二层PDU，包括：
    所述中继终端设备确定与所述层二标识对应的终端设备标识；
    所述中继终端设备对所述第一二层PDU中携带的数据进行封装处理，生成第二二层PDU，其中，所述第二二层PDU携带所述对应的终端设备标识。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，若所述发送端设备为所述远端终端设备且所述接收端设备为所述网络设备，在所述中继终端设备根据所述第一二层PDU，生成第二二层PDU之前，所述方法还包括：
    所述中继终端设备确定与所述远端终端设备的标识信息对应的前导码；
    所述中继终端设备向所述网络设备发送所述前导码；
    所述中继终端设备接收所述网络设备根据所述前导码发送的上行授权，所述上行授权携带所述网络设备分配的上行传输资源；
    所述中继终端设备向所述接收端设备发送所述第二二层PDU，包括：
    所述中继终端设备采用所述上行传输资源向所述网络设备发送所述第二二层PDU。
  6. 根据权利要求1至4中任一项所述的方法，其特征在于，若所述发送端设备为所述远端终端设备且所述接收端设备为网络设备，在所述中继终端设备向所述接收端设备发送所述第二二层PDU之前，所述方法还包括：
    所述中继终端设备向所述网络设备发送缓存状态报告BSR，其中，所述BSR中携带所述远端终端设备的标识信息；
    所述中继终端设备接收所述网络设备根据所述BSR发送的PDCCH，所述PDCCH携带所述远端终端设备的标识信息；
    所述中继终端设备向所述接收端设备发送所述第二二层PDU，包括：
    所述中继终端设备根据所述PDCCH，向所述网络设备发送所述第二二层PDU。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，若所述发送端设备为所述远端终端设备且所述接收端设备为网络设备，所述远端终端设备的标识信息包括所述远端终端设备的终端设备标识；
    所述中继终端设备根据所述第一二层PDU，生成第二二层PDU，包括：
    所述中继终端设备确定与所述终端设备标识对应的层二标识；
    所述中继终端设备对所述第一二层PDU中携带的数据进行封装处理，生成第二二层PDU，其中，所述第二二层PDU携带所述对应的层二标识。
  8. 根据权利要求1至7中任一项所述的方法，其特征在于，所述第一二层PDU和所述第二二层PDU中通过D2D通信接口传输的PDU与所述中继终端设备与所述远端终端设备之间采用的D2D通信技术相对应，所述第一二层PDU和所述第二二层PDU中通过蜂窝通信接口传输的二层PDU具体为MAC PDU。
  9. 根据权利要求8所述的方法，其特征在于，所述远端终端设备的标识信息承载于MAC PDU的MAC控制元素字段中。
  10. 根据权利要求1至9中任一项所述的方法，其特征在于，所述第一 二层PDU携带中继特定逻辑信道标识；
    在所述中继终端设备根据所述第一二层PDU，生成第二二层PDU之前，所述方法还包括：
    所述中继终端设备根据所述中继特定逻辑信道标识，确定需要转发所述第一二层PDU中携带的数据。
  11. 根据权利要求1至10中任一项所述的方法，其特征在于，若所述发送端设备为所述远端终端设备且所述接收端设备为网络设备，所述第一二层PDU是所述远端终端设备采用用于中继传输的传输资源发送的；
    在所述中继终端设备根据所述第一二层PDU，生成第二二层PDU之前，所述方法还包括：
    所述中继终端设备根据所述传输资源，确定需要转发所述第一二层PDU中携带的数据。
  12. 根据权利要求1至11中任一项所述的方法，其特征在于，若所述发送端设备为所述网络设备且所述接收端设备为远端终端设备，所述第一二层PDU是网络设备通过由中继特定RNTI加扰的物理下行控制信道PDCCH调度的；
    在所述中继终端设备根据所述第一二层PDU，生成第二二层PDU之前，所述方法还包括：
    所述中继终端设备根据用于调度所述第一二层PDU的PDCCH采用的中继特定RNTI，确定需要转发所述第一二层PDU中携带的数据。
  13. 根据权利要求1至12中任一项所述的方法，其特征在于，在所述中继终端设备接收发送端设备发送的第一二层PDU之前，所述方法还包括：
    所述中继终端设备接收所述远端终端设备的连接建立请求，所述连接建立请求用于请求建立所述中继终端设备与所述远端终端设备之间的D2D通信链路；
    所述中继终端设备根据所述连接建立请求，向核心网设备发送承载建立请求，所述承载建立请求携带所述远端终端设备的终端设备标识，以便于所述核心网设备与所述网络设备建立所述远端终端设备的演进分组系统EPS承载；
    所述中继终端设备接收所述网络设备发送的承载建立响应，所述承载建立响应携带所述EPS承载的配置信息，其中，所述EPS承载包括所述网络 设备与所述中继终端设备之间的蜂窝数据传输通道以及所述中继终端设备与所述远端终端设备之间的D2D数据传输通道。
  14. 根据权利要求13所述的方法，其特征在于，所述EPS承载的配置信息包括MAC层配置信息和物理层配置信息；
    所述方法还包括：
    所述中继终端设备向所述远端终端设备发送连接建立响应，所述连接建立响应携带所述物理层配置信息和所述MAC层配置信息。
  15. 根据权利要求14所述的方法，其特征在于，所述EPS承载的配置信息还包括下列信息中的至少一种：PDCP层配置信息和RLC层配置信息。
  16. 根据权利要求11至15中任一项所述的方法，其特征在于，所述EPS承载的配置信息包括所述网络设备为所述远端终端设备分配的层二标识和/或RNTI。
  17. 一种中继传输的方法，其特征在于，包括：
    发送端设备对待向接收端设备发送的数据进行封装处理，生成第一二层协议数据单元PDU，其中，所述第一二层PDU携带远端终端设备的标识信息，或者所述第一二层PDU是通过采用远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
    所述发送端设备向中继终端设备发送所述第一二层PDU；
    其中，所述发送端设备为所述远端终端设备且所述接收端设备为网络设备，或所述发送端设备为网络设备且所述接收端设备为所述远端终端设备。
  18. 根据权利要求17所述的方法，其特征在于，所述远端终端设备的标识信息包括所述远端终端设备的终端设备标识或所述远端终端设备的层二标识。
  19. 根据权利要求18所述的方法，其特征在于，所述远端终端设备的层二标识设置在下列层中的一种：媒体访问控制MAC层、分组数据汇聚协议PDCP层和无线链路控制RLC层；或者，
    所述发送端设备的层二包括适配层，所述适配层位于MAC层和PDCP层之间，并且所述远端终端设备的层二标识设置在适配层。
  20. 根据权利要求17至19中任一项所述的方法，其特征在于，若所述发送端设备为网络设备，所述第一二层PDU具体为MAC PDU；
    若所述发送端设备为所述远端终端设备，所述第一二层PDU与所述远 端终端设备与所述中继终端设备之间的D2D通信技术相对应。
  21. 根据权利要求20所述的方法，其特征在于，所述远端终端设备的标识信息承载于MAC PDU的MAC控制元素字段中。
  22. 根据权利要求17至21中任一项所述的方法，其特征在于，所述第一二层PDU携带中继特定逻辑信道标识，所述中继特定逻辑信道标识用于所述中继终端设备确定需要转发所述第一二层PDU中携带的数据。
  23. 根据权利要求17至22中任一项所述的方法，其特征在于，若所述发送端设备为所述远端终端设备，所述发送端设备向中继终端设备发送所述第一二层PDU，包括：
    所述远端终端设备采用用于中继传输的传输资源向所述中继终端设备发送所述第一二层PDU。
  24. 根据权利要求17至23中任一项所述的方法，其特征在于，若所述发送端设备为网络设备，在所述发送端设备向中继终端设备发送所述第一二层PDU之前，所述方法还包括：
    所述发送端设备向所述中继终端设备发送采用中继特定RNTI加扰的PDCCH，所述PDCCH用于调度所述第一二层PDU，其中，所述中继特定RNTI用于所述中继终端设备确定所述第一二层PDU中携带的数据需要转发。
  25. 根据权利要求17至24中任一项所述的方法，其特征在于，若所述发送端设备为网络设备，在所述发送端设备生成第一二层PDU之前，所述方法还包括：
    所述网络设备接收承载建立请求，所述承载建立请求携带所述远端终端设备的终端设备标识；
    所述网络设备根据所述承载建立请求，建立所述远端终端设备的演进分组系统EPS承载，其中，所述EPS承载包括所述网络设备与所述中继终端设备之间的蜂窝数据传输通道以及所述中继终端设备与所述远端终端设备之间的D2D数据传输通道；
    所述网络设备向所述中继终端设备发送承载建立响应，所述承载建立响应携带所述EPS承载的配置信息。
  26. 根据权利要求25所述的方法，其特征在于，所述EPS承载的配置信息包括MAC层配置信息和物理层配置信息；或者
    所述EPS承载的配置信息包括MAC层配置信息和物理层配置信息，并且包括PDCP层配置信息和RLC层配置信息中的至少一种。
  27. 根据权利要求25或26所述的方法，其特征在于，所述EPS承载的配置信息包括所述网络设备为所述远端终端设备分配的层二标识和/或RNTI。
  28. 一种中继传输的方法，其特征在于，包括：
    接收端设备接收中继终端设备发送的第二二层协议数据单元PDU，所述第二二层PDU是所述中继终端设备根据发送端设备发送的第一二层PDU生成的，所述第一二层PDU携带远端终端设备的标识信息，或者所述第一二层PDU是通过采用远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
    所述接收端设备确定所述第二二层PDU对应的所述远端终端设备；
    其中，所述发送端设备为所述远端终端设备且所述接收端设备为网络设备，或所述发送端设备为网络设备且所述接收端设备为所述远端终端设备。
  29. 根据权利要求28所述的方法，其特征在于，所述远端终端设备的标识信息包括：所述远端终端设备的终端设备标识或所述远端终端设备的层二标识。
  30. 根据权利要求29所述的方法，其特征在于，所述远端终端设备的层二标识设置在下列层中的一种：媒体访问控制MAC层、分组数据汇聚协议PDCP层和无线链路控制RLC层；或者，
    所述发送端设备和所述接收端设备的层二包括适配层，所述适配层位于MAC层和PDCP层之间，并且所述远端终端设备的层二标识设置在适配层。
  31. 根据权利要求29或30所述的方法，其特征在于，若所述接收端设备为所述远端终端设备，所述第二二层PDU携带所述远端终端设备的终端设备标识；
    所述接收端设备确定所述第二二层PDU对应的所述远端终端设备，包括：
    所述接收端设备根据所述第二二层PDU中携带的终端设备标识，确定所述第二二层PDU对应的所述远端终端设备。
  32. 根据权利要求28至30中任一项所述的方法，其特征在于，若所述接收端设备为所述网络设备，在所述接收端设备接收中继终端设备发送的第 二二层PDU之前，所述方法还包括：
    所述网络设备接收所述中继终端设备发送的所述远端终端设备对应的前导码；
    所述网络设备根据所述前导码，向所述中继终端设备发送上行授权，所述上行授权携带所述网络设备分配的上行传输资源；
    所述接收端设备接收中继终端设备发送的第二二层PDU，包括：
    所述网络设备接收所述中继终端设备采用所述上行传输资源发送的第二二层PDU；
    所述接收端设备确定所述第二二层PDU对应的所述远端终端设备，包括：
    所述中继终端设备根据所述第二二层PDU所占用的上行传输资源，确定所述第二二层PDU对应的所述远端终端设备。
  33. 根据权利要求28至30中任一项所述的方法，其特征在于，若所述接收端设备为网络设备，在所述接收端设备接收中继终端设备发送的第二二层PDU之前，所述方法还包括：
    所述网络设备接收所述中继终端设备发送的缓存状态报告BSR，其中，所述BSR中携带所述远端终端设备的标识信息；
    所述网络设备根据所述BSR，向所述中继终端设备发送PDCCH，所述PDCCH携带所述远端终端设备的标识信息；
    所述接收端设备确定所述第二二层PDU对应的所述远端终端设备，包括：
    所述接收端设备根据用于调度所述第二二层PDU的PDCCH，确定所述第二二层PDU对应的所述远端终端设备。
  34. 根据权利要求28至30中任一项所述的方法，其特征在于，若所述接收端设备为网络设备，所述远端终端设备的标识信息包括所述远端终端设备的终端设备标识，所述第二二层PDU携带所述远端终端设备的层二标识；
    所述接收端设备确定所述第二二层PDU对应的所述远端终端设备，包括：
    所述接收端设备根据所述第二二层PDU中携带的层二标识，确定所述第二二层PDU对应的所述远端终端设备。
  35. 一种中继传输的装置，其特征在于，包括：
    接收单元，用于接收发送端设备向接收端设备发送的第一二层协议数据单元PDU，其中，所述第一二层PDU携带远端终端设备的标识信息，或者所述第一二层PDU是通过采用所述远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
    处理单元，用于根据所述接收单元接收的所述第一二层PDU，生成第二二层PDU；
    发送单元，用于向所述接收端设备发送所述处理单元生成的所述第二二层PDU；
    其中，所述发送端设备为所述远端终端设备且所述接收端设备为网络设备，或所述发送端设备为网络设备且所述接收端设备为所述远端终端设备。
  36. 根据权利要求35所述的装置，其特征在于，所述远端终端设备的标识信息包括所述远端终端设备的层二标识或所述远端终端设备的终端设备标识。
  37. 根据权利要求36所述的装置，其特征在于，所述远端终端设备的层二标识设置在下列层中的一种：媒体访问控制MAC层、分组数据汇聚协议PDCP层和无线链路控制RLC层；或者，
    所述远端终端设备和所述网络设备的层二包括适配层，所述适配层位于MAC层和PDCP层之间，并且所述远端终端设备的层二标识设置在适配层。
  38. 根据权利要求35至37中任一项所述的装置，其特征在于，若所述发送端设备为所述网络设备且所述接收端设备为所述远端终端设备，所述远端终端设备的标识信息包括所述远端终端设备的层二标识；
    所述处理单元具体用于：
    确定与所述层二标识对应的终端设备标识；
    对所述第一二层PDU中携带的数据进行封装处理，生成第二二层PDU，其中，所述第二二层PDU携带所述对应的终端设备标识。
  39. 根据权利要求35至38中任一项所述的装置，其特征在于，若所述发送端设备为所述远端终端设备且所述接收端设备为所述网络设备，所述处理单元还用于在根据所述第一二层PDU，生成第二二层PDU之前，确定与所述远端终端设备的标识信息对应的前导码；
    所述发送单元还用于向所述网络设备发送所述处理单元确定的所述前导码；
    所述接收单元还用于接收所述网络设备根据所述前导码发送的上行授权，所述上行授权指示所述网络设备分配的上行传输资源；
    所述发送单元具体用于采用所述接收单元接收的所述上行授权指示的上行传输资源向所述网络设备发送所述第二二层PDU。
  40. 根据权利要求35至38中任一项所述的装置，其特征在于，若所述发送端设备为所述远端终端设备且所述接收端设备为网络设备，所述发送单元还用于在向所述接收端设备发送所述第二二层PDU之前，向所述网络设备发送缓存状态报告BSR，其中，所述BSR中携带所述远端终端设备的标识信息；
    所述接收单元还用于接收所述网络设备根据所述BSR发送的PDCCH，所述PDCCH携带所述远端终端设备的标识信息；
    所述发送单元具体用于根据所述接收单元接收的所述PDCCH，向所述网络设备发送所述第二二层PDU。
  41. 根据权利要求35至40中任一项所述的装置，其特征在于，若所述发送端设备为所述远端终端设备且所述接收端设备为网络设备，所述远端终端设备的标识信息包括所述远端终端设备的终端设备标识；
    所述处理单元具体用于：
    确定与所述终端设备标识对应的层二标识；
    对所述第一二层PDU中携带的数据进行封装处理，生成第二二层PDU，其中，所述第二二层PDU携带所述对应的层二标识。
  42. 根据权利要求35至41中任一项所述的装置，其特征在于，所述第一二层PDU和所述第二二层PDU中通过D2D通信接口传输的PDU与所述中继终端设备与所述远端终端设备之间采用的D2D通信技术相对应，所述第一二层PDU和所述第二二层PDU中通过蜂窝通信接口传输的二层PDU具体为MAC PDU。
  43. 根据权利要求42所述的装置，其特征在于，所述远端终端设备的标识信息承载于MAC PDU的MAC控制元素字段中。
  44. 根据权利要求35至43中任一项所述的装置，其特征在于，所述第一二层PDU携带中继特定逻辑信道标识；
    所述处理单元还用于在根据所述第一二层PDU，生成第二二层PDU之前，根据所述中继特定逻辑信道标识，确定需要转发所述第一二层PDU中 携带的数据。
  45. 根据权利要求35至44中任一项所述的装置，其特征在于，若所述发送端设备为所述远端终端设备且所述接收端设备为网络设备，所述第一二层PDU是所述远端终端设备采用用于中继传输的传输资源发送的；
    所述处理单元还用于在根据所述第一二层PDU，生成第二二层PDU之前，根据所述传输资源，确定需要转发所述第一二层PDU中携带的数据。
  46. 根据权利要求35至45中任一项所述的装置，其特征在于，若所述发送端设备为所述网络设备且所述接收端设备为远端终端设备，所述第一二层PDU是网络设备通过由中继特定RNTI加扰的物理下行控制信道PDCCH调度的；
    所述处理单元还用于在根据所述第一二层PDU，生成第二二层PDU之前，根据用于调度所述第一二层PDU的PDCCH采用的中继特定RNTI，确定需要转发所述第一二层PDU中携带的数据。
  47. 根据权利要求35至46中任一项所述的装置，其特征在于，所述接收单元还用于在接收发送端设备发送的第一二层PDU之前，接收所述远端终端设备的连接建立请求，所述连接建立请求用于请求建立所述中继终端设备与所述远端终端设备之间的D2D通信链路；
    所述发送单元还用于根据所述连接建立请求，向核心网设备发送承载建立请求，所述承载建立请求携带所述远端终端设备的终端设备标识，以便于所述核心网设备与所述网络设备建立所述远端终端设备的演进分组系统EPS承载，其中，所述EPS承载包括所述网络设备与所述中继终端设备之间的蜂窝数据传输通道以及所述中继终端设备与所述远端终端设备之间的D2D数据传输通道；
    所述接收单元还用于接收所述网络设备发送的承载建立响应，所述承载建立响应携带所述EPS承载的配置信息。
  48. 根据权利要求47所述的装置，其特征在于，所述EPS承载的配置信息包括MAC层配置信息和物理层配置信息；
    所述发送单元还用于向所述远端终端设备发送连接建立响应，所述连接建立响应携带所述物理层配置信息和所述MAC层配置信息。
  49. 根据权利要求48所述的装置，其特征在于，所述EPS承载的配置信息还包括下列信息中的至少一种：PDCP层配置信息和RLC层配置信息。
  50. 根据权利要求45至49中任一项所述的装置，其特征在于，所述EPS承载的配置信息包括所述网络设备为所述远端终端设备分配的层二标识和/或RNTI。
  51. 一种中继传输的装置，其特征在于，包括：
    处理单元，用于对待向接收端设备发送的数据进行封装处理，生成第一二层协议数据单元PDU，其中，所述第一二层PDU携带远端终端设备的标识信息，或者所述第一二层PDU是通过采用远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
    发送单元，用于向中继终端设备发送所述处理单元生成的所述第一二层PDU；
    其中，所述装置为所述远端终端设备且所述接收端设备为网络设备，或所述装置为网络设备且所述接收端设备为所述远端终端设备。
  52. 根据权利要求51所述的装置，其特征在于，所述远端终端设备的标识信息包括所述远端终端设备的终端设备标识或所述远端终端设备的层二标识。
  53. 根据权利要求52所述的装置，其特征在于，所述远端终端设备的层二标识设置在下列层中的一种：媒体访问控制MAC层、分组数据汇聚协议PDCP层和无线链路控制RLC层；或者，
    所述装置的层二包括适配层，所述适配层位于MAC层和PDCP层之间，并且所述远端终端设备的层二标识设置在适配层。
  54. 根据权利要求51至53中任一项所述的装置，其特征在于，若所述装置为网络设备，所述第一二层PDU具体为MAC PDU；
    若所述装置为所述远端终端设备，所述第一二层PDU与所述远端终端设备与所述中继终端设备之间的D2D通信技术相对应。
  55. 根据权利要求54所述的装置，其特征在于，所述远端终端设备的标识信息承载于MAC PDU的MAC控制元素字段中。
  56. 根据权利要求51至55中任一项所述的装置，其特征在于，所述第一二层PDU携带中继特定逻辑信道标识，所述中继特定逻辑信道标识用于所述中继终端设备确定需要转发所述第一二层PDU中携带的数据。
  57. 根据权利要求51至56中任一项所述的装置，其特征在于，若所述装置为所述远端终端设备，所述发送单元具体用于采用用于中继传输的传输 资源向所述中继终端设备发送所述第一二层PDU。
  58. 根据权利要求51至57中任一项所述的装置，其特征在于，若所述装置为所述网络设备，所述发送单元还用于在向中继终端设备发送所述第一二层PDU之前，向所述中继终端设备发送采用中继特定RNTI加扰的PDCCH，所述PDCCH用于调度所述第一二层PDU，其中，所述中继特定RNTI用于所述中继终端设备确定所述第一二层PDU中携带的数据需要转发。
  59. 根据权利要求51至58中任一项所述的装置，其特征在于，若所述装置为网络设备，所述装置还包括：
    接收单元，用于在所述处理单元生成第一二层PDU之前，接收承载建立请求，所述承载建立请求携带所述远端终端设备的终端设备标识；
    所述处理单元还用于根据所述接收单元接收的所述承载建立请求，建立所述远端终端设备的演进分组系统EPS承载，其中，所述EPS承载包括所述网络设备与所述中继终端设备之间的蜂窝数据传输通道以及所述中继终端设备与所述远端终端设备之间的D2D数据传输通道；
    所述发送单元还用于向所述中继终端设备发送承载建立响应，所述承载建立响应携带所述EPS承载的配置信息。
  60. 根据权利要求59所述的装置，其特征在于，所述EPS承载的配置信息包括MAC层配置信息和物理层配置信息；或者
    所述EPS承载的配置信息包括MAC层配置信息和物理层配置信息，并且包括PDCP层配置信息和RLC层配置信息中的至少一种。
  61. 根据权利要求59或60所述的装置，其特征在于，所述EPS承载的配置信息包括所述网络设备为所述远端终端设备分配的层二标识和/或RNTI。
  62. 一种中继传输的装置，其特征在于，包括：
    接收单元，用于接收中继终端设备发送的第二二层协议数据单元PDU，所述第二二层PDU是所述中继终端设备根据发送端设备发送的第一二层PDU生成的，所述第一二层PDU携带远端终端设备的标识信息，或者所述第一二层PDU是通过采用远端终端设备的无线网络临时标识RNTI进行加扰的物理下行控制信道PDCCH调度的；
    处理单元，用于确定所述接收单元接收的所述第二二层PDU对应的所 述远端终端设备；
    其中，所述发送端设备为所述远端终端设备且所述装置为网络设备，或所述发送端设备为网络设备且所述装置为所述远端终端设备。
  63. 根据权利要求62所述的装置，其特征在于，所述远端终端设备的标识信息包括：所述远端终端设备的终端设备标识或所述远端终端设备的层二标识。
  64. 根据权利要求63所述的装置，其特征在于，所述远端终端设备的层二标识设置在下列层中的一种：媒体访问控制MAC层、分组数据汇聚协议PDCP层和无线链路控制RLC层；或者，
    所述发送端设备和所述装置的层二包括适配层，所述适配层位于MAC层和PDCP层之间，并且所述远端终端设备的层二标识设置在适配层。
  65. 根据权利要求63或64所述的装置，其特征在于，若所述装置为所述远端终端设备，所述第二二层PDU携带所述远端终端设备的终端设备标识；
    所述处理单元具体用于根据所述第二二层PDU中携带的终端设备标识，确定所述第二二层PDU对应的所述远端终端设备。
  66. 根据权利要求62至65中任一项所述的装置，其特征在于，若所述装置为所述网络设备，所述接收单元还用于在接收中继终端设备发送的第二二层PDU之前，接收所述中继终端设备发送的所述远端终端设备对应的前导码；
    所述装置还包括：
    发送单元，用于根据所述接收单元接收的所述前导码，向所述中继终端设备发送上行授权，所述上行授权指示所述网络设备分配的上行传输资源；
    所述接收单元具体用于接收所述中继终端设备采用所述发送单元发送的上行授权指示的所述上行传输资源发送的第二二层PDU；
    所述处理单元具体用于根据所述第二二层PDU所占用的上行传输资源，确定所述第二二层PDU对应的所述远端终端设备。
  67. 根据权利要求62至64中任一项所述的装置，其特征在于，若所述装置为网络设备，所述接收单元还用于在接收中继终端设备发送的第二二层PDU之前，接收所述中继终端设备发送的缓存状态报告BSR，其中，所述BSR中携带所述远端终端设备的标识信息；
    所述装置还包括：
    发送单元，用于根据所述接收单元接收的所述BSR，向所述中继终端设备发送PDCCH，所述PDCCH携带所述远端终端设备的标识信息；
    所述处理单元具体用于根据用于调度所述第二二层PDU的PDCCH，确定所述第二二层PDU对应的所述远端终端设备。
  68. 根据权利要求62至64中任一项所述的装置，其特征在于，若所述装置为网络设备，所述远端终端设备的标识信息包括所述远端终端设备的终端设备标识，所述第二二层PDU携带所述远端终端设备的层二标识；
    所述处理单元具体用于根据所述第二二层PDU中携带的层二标识，确定所述第二二层PDU对应的所述远端终端设备。
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