Relay transmission method and device
地域：
Guangdong
摘要
Disclosed in the present invention are a relay transmission method and device, enabling reduction of complexity and latency of data processing. The method comprises: a relay terminal apparatus receives a first layer-two PDU sent by a transmitting-end apparatus to a receiving-end apparatus, wherein the first layer-two PDU carries identifier information of a remote terminal apparatus, or the first layer-two PDU schedules a scrambled PDCCH by means of an RNTI of the remote terminal apparatus; the relay terminal apparatus generates, according to the first layer-two PDU, a second layer-two PDU; and the relay terminal apparatus sends to the receiving-end apparatus the second layer-two PDU, wherein the transmitting-end apparatus is the remote terminal apparatus, and the receiving-end apparatus is a network apparatus; alternatively, the transmitting-end apparatus is a network apparatus, and the receiving-end apparatus is the remote terminal apparatus.
說明書
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This application is an application under 35 U.S.C. 371 of International Application No. PCT/CN2016/077913 filed on Mar. 30, 2016, the entire contents of which are incorporated herein by reference.
Embodiments of the disclosure relate to the field of communications, and more particularly to a relay transmission method and device.
A Device-to-Device (D2D) technology refers to that neighboring terminal equipment may perform data transmission in a direct link manner in a short-distance range and network equipment for forwarding is not required. A licensed frequency band resource may be shared between D2D communication and a cellular system to form a unified hybrid cellular-D2D network. In the hybrid network, part of terminal equipment may still work in a cellular communication mode, namely communicating with other terminal equipment through network equipment, while part of terminal equipment may work in a D2D communication mode, namely performing direct data transmission with the other terminal equipment through D2D links with the other terminal equipment.
In addition, data transmission between network equipment and terminal equipment may be assisted through a D2D relay. In such case, a D2D communication mode is adopted between the D2D relay and a D2D terminal, while a cellular communication mode is used between the D2D relay and the network equipment. The D2D relay receives and forwards data in a half duplex manner, and performs mode switching in a receiving and forwarding process.
權利要求
The invention claimed is:1. A relay transmission system, comprising: a sender equipment, a receiver equipment, and a relay terminal equipment,wherein the sender equipment is configured to: perform encapsulation processing on data to be sent to the receiver equipment to generate a first layer-2 Protocol Data Unit (PDU) which is intended to be sent from the sender equipment to the receiver equipment, wherein the first layer-2 PDU contains identification information of a remote terminal equipment and the layer-2 PDU indicates that an outermost layer or highest layer of the data is encapsulated in layer 2 of the equipment, wherein the identification information of the remote terminal equipment comprises a specific identifier of the remote terminal equipment which is configured by a network equipment and a length of the specific identifier is smaller than a length of a terminal equipment identifier, wherein the specific identifier of the remote terminal equipment is configured to uniquely identify the remote terminal equipment during relay transmission; and send the first layer-2 PDU to the relay terminal equipment; wherein the relay terminal equipment is configured to: receive the first layer-2 PDU; generate a second layer-2 PDU according to the first layer-2 PDU; and send the second layer-2 PDU to the receiver equipment, wherein the sender equipment is the network equipment and the receiver equipment is the remote terminal equipment, wherein layer 2 of each of the remote terminal equipment and the network equipment comprises an Adaptation (ADP) layer, the ADP layer is located between the MAC layer and the PDCP layer, and a layer-2 identifier of the remote terminal equipment is contained in the ADP layer, wherein the ADP layer is configured to convert data received from a lower layer and transmitted by adopting various D2D communication technologies into a communication technology unrelated form, and transmit processed data to a upper layer for further processing wherein the first layer-2 PDU contains a relay-specific Logical Channel Identifier (LCID); and the relay terminal equipment is further configured to, before generating the second layer-2 PDU according to the first layer-2 PDU, determine that the data contained in the first layer-2 PDU is required to be forwarded according to the relay-specific LCID. 2. The system according to claim 1 , wherein the relay terminal equipment is specifically configured to:determine the terminal equipment identifier corresponding to the layer-2 identifier; and perform encapsulation processing on data contained in the first layer-2 PDU in layer 2 to generate the second layer-2 PDU, wherein the second layer-2 PDU contains the corresponding terminal equipment identifier. 3. The system according to claim 1 , wherein the relay terminal equipment is further configured to, before generating the second layer-2 PDU according to the first layer-2 PDU, determine a preamble corresponding to the identification information of the remote terminal equipment;the relay terminal equipment is further configured to send the preamble to the network equipment; the relay terminal equipment is further configured to receive an uplink grant which is sent by the network equipment in response to the preamble, the uplink grant indicating an uplink transmission resource allocated by the network equipment; and the relay terminal equipment is specifically configured to adopt the uplink transmission resource indicated by the uplink grant to send the second layer-2 PDU to the network equipment. 4. The system according to claim 1 , wherein the PDU, which is transmitted through a Device-to-Device (D2D) communication interface, of the first layer-2 PDU and the second layer-2 PDU corresponds to a D2D communication technology adopted between the relay terminal equipment and the remote terminal equipment, and the layer-2 PDU, which is transmitted through a cellular communication interface, of the first layer-2 PDU and the second layer-2 PDU is a MAC PDU, and wherein the identification information of the remote terminal equipment is born in a MAC Control Element (CE) field of the MAC PDU. 5. The system according to claim 1 , wherein the first layer-2 PDU is a MAC PDU. 6. The system according to claim 1 , wherein the first layer-2 PDU contains a relay-specific Logical Channel Identifier (LCID), and the relay-specific LCID is configured for the relay terminal equipment to determine that the data contained in the first layer-2 PDU is required to be forwarded. 7. The system according to claim 1 , wherein the sender equipment is further configured to, before sending the first layer-2 PDU to the relay terminal equipment, send a PDCCH scrambled by adopting a relay-specific RNTI to the relay terminal equipment, the PDCCH being configured to schedule the first layer-2 PDU, wherein the relay-specific RNTI is configured for the relay terminal equipment to determine that the data contained in the first layer-2 PDU is required to be forwarded. 8. The system according to claim 1 , wherein the sender equipment is further configured to: before generating the first layer-2 PDU, receive a bearer establishment request, the bearer establishment request containing the terminal equipment identifier of the remote terminal equipment, whereinthe sender equipment is further configured to establish an Evolved Packet System (EPS) bearer of the remote terminal equipment according to the bearer establishment request, wherein the EPS bearer comprises a cellular data transmission channel between the network equipment and the relay terminal equipment and a D2D data transmission channel between the relay terminal equipment and the remote terminal equipment; and the sender equipment is further configured to send a bearer establishment response to the relay terminal equipment, the bearer establishment response containing configuration information of the EPS bearer, wherein the configuration information of the EPS bearer comprises MAC-layer configuration information and Physics (PHY)-layer configuration information; or the configuration information of the EPS bearer comprises the MAC-layer configuration information and the PHY-layer configuration information, and comprises at least one of PDCP-layer configuration information or RLC-layer configuration information. 9. The system according to claim 8 , wherein the configuration information of the EPS bearer comprises at least one of the layer-2 identifier or RNTI allocated to the remote terminal equipment by the network equipment. 10. The system according to claim 1 , wherein the receiver equipment is further configured to:receive the second layer-2 Protocol Data Unit (PDU) sent by the relay terminal equipment, the second layer-2 PDU being generated by the relay terminal equipment according to the first layer-2 PDU sent by sender equipment; and determine the remote terminal equipment corresponding to the second layer-2 PDU. 11. The system according to claim 10 , wherein the second layer-2 PDU contains the terminal equipment identifier of the remote terminal equipment; andthe receiver equipment is specifically configured to determine the remote terminal equipment corresponding to the second layer-2 PDU according to the terminal equipment identifier contained in the second layer-2 PDU. 12. The system according to claim 10 , wherein if the receiver equipment is the network equipment, the identification information of the remote terminal equipment comprises the terminal equipment identifier of the remote terminal equipment, and the second layer-2 PDU contains the layer-2 identifier of the remote terminal equipment; andthe receiver equipment is specifically configured to determine the remote terminal equipment corresponding to the second layer-2 PDU according to the layer-2 identifier contained in the second layer-2 PDU. 13. The system according to claim 1 , wherein the ADP layer is configured to encapsulate and parse the identification information of the remote terminal equipment, when the remote terminal equipment or the network equipment has data to be sent, the data to be sent is sequentially encapsulated through the PDCP layer, the RLC layer and the ADP layer, wherein a relay-specific LCID is contained in the ADP layer, and the relay-specific LCID is configured to identify relay data.
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