A data transmission method, user equipment and base station

Abstract

An embodiment of the present invention provides a data transmission method. The method includes: a user equipment sends uplink data to a base station through an uplink user equipment relay; the user equipment receives downlink data from the base station, or the user equipment receives downlink data from the base station through a downlink user equipment relay. By performing uplink transmission and downlink transmission respectively through different transmission paths, the impact on the network caused by user equipment relay failure and the like can be reduced, thereby improving the reliability of the network.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a data transmission method, user equipment and base station. Background Art

[0002] With the development of wireless technology, in order to ease the network load, device-to-device (D2D) communication technology has been proposed. D2D communication technology (D2D technology) allows user equipment (UE) within a certain distance to communicate directly without having to go through a third-party device, such as a base station, for transfer. Figure 1 As shown, within the coverage of the base station, the base station can communicate with UE1, UE2 and UE3 respectively through cellular links. When D2D technology is adopted, UE1 can directly communicate with UE2 or UE3 through a D2D communication link (also called Slide Link, abbreviated as: SL), UE2 can directly communicate with UE1 or UE3 through SL, and UE3 can directly communicate with UE1 or UE2 through SL.

[0003] In D2D technology, in order to improve the communication capability of the network, the idea of ​​using user equipment as a relay node is proposed. However, how to improve the reliability of communication in a network using D2D technology needs to be solved urgently. Summary of the invention

[0004] The embodiments of the present invention provide a data transmission method, user equipment and base station, which are used to improve the reliability of a network using D2D technology.

[0005] In a first aspect, an embodiment of the present invention provides a data transmission method, including: a user equipment (English: userequipment, abbreviated as: UE) sends uplink data to a base station through an uplink user equipment relay (English: uplink UE-relay), and the UE receives downlink data from the base station, or the UE receives downlink data from the base station through a downlink user equipment relay (English: downlink UE-relay).

[0006] Those skilled in the art can understand that receiving downlink data from a base station means directly receiving downlink data from the base station without being relayed by the user equipment.

[0007] In one possible design, the method further includes: the UE sending first indication information to the uplinkUE-relay, the first indication information being used to indicate an uplink transmission resource corresponding to the UE, so that the uplinkUE-relay sends the uplink data to the base station according to the uplink transmission resource. The uplink UE-relay transmits the uplink data using the uplink transmission resource corresponding to the UE, so that the base station does not perceive that the uplink data is sent by the uplink UE-relay, thereby avoiding additional processing by the base station and saving the overhead of the base station.

[0008] Optionally, the uplink transmission resource includes a physical uplink control channel (English: physical uplink control channel, referred to as: PUCCH) resource; the first indication information includes n CCE as well as Among them, n CCE It is used to indicate the number of the first control channel element (CCE) used to indicate downlink transmission in the physical downlink control channel (PDCCH). Used to indicate the UE-specific PUCCH ACK / NACK (full name in English: acknowledgement / negativeacknowledgement, Chinese: response or negative response) resource offset or used to indicate the PUCCH format 1a / 1b starting offset for subframe set K2. Through the UE's PUCCH resources, the uplink UE-relay can send the UE's response to the downlink data to the base station as the UE, so that the base station can immediately know that it is the UE's response to the downlink data, which has little impact on the existing hybrid automatic repeat request (English: hybrid automatic repeat request, referred to as: HARQ) process.

[0009] Optionally, the first indication information may also include The index of the channel quality indicator (CQI) assigned to the UE is The uplink UE-relay can feed back the UE's periodic CQI to the base station on the PUCCH resource.

[0010] Optionally, for different uplink transmission resources, the first indication information includes different parameters, which will be described in detail in the embodiments.

[0011] Optionally, the uplink data is received by the base station according to the PUCCH resource after delaying m transmission time intervals (English: transmission time interval, abbreviated as: TTI); wherein m is a positive integer. Optionally, the m TTIs are greater than or equal to the time taken by the UE to send the first indication information and the uplink data to the uplink UE-relay. By delaying the reception by m TTIs, it is helpful to increase the probability that the base station correctly receives the uplink data from the uplink UE-relay.

[0012] In another possible design, the method also includes: the UE receives second indication information from the uplink UE-relay, and the second indication information is used to indicate the downlink transmission resources corresponding to the uplink UE-relay; the UE receives the downlink data from the base station, including: the UE receives the downlink data from the base station according to the downlink transmission resources.

[0013] Optionally, the downlink transmission resource includes a PHICH resource; the second indication information includes n DMRS and Among them, n DMRS Used to indicate the offset of DMRS. Used to indicate the index of the smallest PRB for uplink transmission.

[0014] After the UE learns the downlink transmission resources corresponding to the uplink UE-relay, it can directly receive the base station's response to the uplink data from the base station, and avoids forwarding the response by the uplink UE-relay, thereby further improving the reliability of the network.

[0015] In another possible design, the method further includes: the UE receives a response from the uplink UE-relay to the uplink data. The response enables the UE to know whether the uplink data is correctly sent to the uplink UE-relay, so that the UE can decide whether to resend the uplink data, thereby improving the reliability of transmitting the uplink data.

[0016] In another possible design, the method further includes: the UE sending a response of the UE to the downlink data to the downlink UE-relay. The response enables the downlink UE-relay to know whether the downlink data is successfully sent to the UE, so as to decide whether to resend, thereby increasing the reliability of transmitting the downlink data.

[0017] In a second aspect, an embodiment of the present invention provides a UE, which includes a module for executing a behavior corresponding to the UE in the method of the first aspect. The module may be software and / or hardware.

[0018] In one possible design, the UE includes a processor and a memory, wherein the processor is configured to support the UE to execute corresponding functions in the method of the first aspect. The memory is used to be coupled with the processor and stores program instructions and data necessary for the UE.

[0019] In a third aspect, an embodiment of the present invention provides a data transmission method, including: a base station receives uplink data of a UE through an uplink UE-relay; the base station sends downlink data to the UE, or the base station sends downlink data to the UE through a downlink UE-relay.

[0020] In a possible design, the base station receives uplink data of the UE through the uplink UE-relay, including: the base station receives the uplink data of the UE from the uplink UE-relay according to the uplink transmission resources corresponding to the UE. After receiving the uplink data forwarded by the uplink UE-relay on the uplink transmission resources corresponding to the UE, the base station considers that the uplink data is sent by the UE, thereby avoiding the base station identifying the source of the uplink data through additional processing.

[0021] In another possible design, the base station receives the uplink data of the UE from the uplink UE-relay according to the uplink transmission resource corresponding to the UE, including: the base station receives the uplink data from the uplink UE-relay according to the uplink transmission resource after delaying m TTIs; wherein m is a positive integer. By delaying m TTIs, the success rate of the base station receiving the uplink data can be improved.

[0022] In a fourth aspect, an embodiment of the present invention provides a base station, which includes a module for executing the behavior corresponding to the base station in the method of the third aspect. The module may be software and / or hardware.

[0023] In a possible design, the base station includes a processor and a memory, wherein the processor is configured to support the base station to perform corresponding functions in the method of the third aspect. The memory is used to be coupled with the processor and stores necessary program instructions and data for the base station.

[0024] In a fifth aspect, an embodiment of the present invention provides a data transmission method, including: a user equipment relay receives uplink data from a user equipment; the user equipment relay sends the uplink data to a base station; the user equipment relay sends second indication information to the user equipment, where the second indication information is used for a PHICH resource corresponding to the user equipment relay, so that the user equipment receives a response to the uplink data from the base station according to the PHICH resource.

[0025] Optionally, the content of the second indication information may refer to the relevant content in the first aspect.

[0026] In one possible design, the method further includes: the user equipment relay sends a response of the user equipment relay to the uplink data to the user equipment. This step enables the user equipment to know whether the uplink data is successfully sent to the user equipment relay, so that the user equipment can decide whether to resend the uplink data, thereby improving the reliability of uplink data transmission.

[0027] In a sixth aspect, an embodiment of the present invention provides a user equipment relay, which includes a module for executing the behavior corresponding to the uplink UE-relay in the method of the fifth aspect. The module may be software and / or hardware.

[0028] In one possible design, the user equipment relay includes a processor and a memory, wherein the processor is configured to support the user equipment relay to perform corresponding functions in the method of the fifth aspect. The memory is used to couple with the processor and store necessary program instructions and data for the user equipment relay.

[0029] In the seventh aspect, an embodiment of the present invention provides a data transmission method, comprising: a user equipment relay receives first indication information from a user equipment; wherein the first indication information is used to indicate a PUCCH resource corresponding to the user equipment; the user equipment relay receives uplink data from the user equipment; and the user equipment relay sends the uplink data to the base station according to the PUCCH resource.

[0030] Optionally, the content of the first indication information may refer to the relevant content of the first aspect.

[0031] In one possible design, the method further includes the user equipment relay sending a response to the uplink data to the user equipment. This step enables the user equipment to know whether the uplink data is successfully sent to the user equipment relay, so that the user equipment can decide whether to resend the uplink data, thereby improving the reliability of uplink data transmission.

[0032] In an eighth aspect, an embodiment of the present invention provides a user equipment relay, which includes a module for executing the behavior corresponding to the uplink UE-relay in the method of the seventh aspect. The module may be software and / or hardware.

[0033] In one possible design, the user equipment relay includes a processor and a memory, wherein the processor is configured to support the user equipment relay to perform corresponding functions in the method of the seventh aspect. The memory is used to couple with the processor and store necessary program instructions and data for the user equipment relay.

[0034] In a ninth aspect, an embodiment of the present invention provides a data transmission system, including the above-mentioned UE and uplink UE-relay. The operation mechanism of the system can refer to the relevant contents of the above-mentioned aspects.

[0035] In one possible design, the system may also include the base station in the above aspect.

[0036] In a tenth aspect, an embodiment of the present invention provides a computer storage medium, which contains a program designed to execute the above aspects.

[0037] In each of the above aspects, the transmission power required for the UE to send uplink data to the uplink UE-relay is less than the transmission power required for the UE to directly send uplink data to the base station, so the power consumption of the UE can be reduced. Preferably, the distance between the UE and the uplink UE-relay is less than the distance between the UE and the base station. Optionally, the UE and the uplink UE-relay, or the UE and the downlink UE-relay can communicate in a unicast or broadcast manner, which is not limited in the embodiment of the present invention.

[0038] The above-mentioned scheme provided by the embodiment of the present invention performs uplink transmission and downlink transmission respectively through different transmission paths, which can reduce the impact on the network due to UE-relay failure and other reasons, and improve the reliability of the network. In addition, by directly receiving downlink data from the base station and transmitting uplink data through UE-realy, the UE can use a smaller transmission power to send data, which reduces the power consumption of the UE and improves the endurance of the UE. In addition, near the edge of the base station coverage, since the downlink transmission quality is better than the uplink transmission quality, the uplink transmission directly performed by the UE and the base station is switched to relaying through UE-relay, which can improve the uplink transmission quality of the UE. In addition, due to the limitation of the maximum transmission power of the UE, the uplink transmission distance of the UE may be less than the coverage range of the base station. Therefore, switching the uplink transmission directly performed by the UE and the base station to relaying through UE-relay can increase the uplink transmission distance of the UE. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] Figure 1 A schematic diagram of a wireless network using D2D technology provided by an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the structure of a user equipment provided by an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of the structure of a base station provided in an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of a data transmission method provided by an embodiment of the present invention;

[0044] Figure 5 A schematic diagram of another data transmission method provided by an embodiment of the present invention;

[0045] Figure 6 A schematic diagram of another data transmission method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] The network architecture and business scenarios described in the embodiments of the present invention are intended to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

[0048] For ease of understanding, the present invention is based on the Third Generation Partnership Project (3GPP). rdThe present invention will be described using the Long Term Evolution (LTE) network defined by the 3GPP (3rd Generation Partnership Project, 3GPP) as an example. 3GPP is a project dedicated to the development of wireless communication networks. Except where otherwise specified in the embodiments, the LTE network in the embodiments of the present invention follows the standards of 3GPP. Those skilled in the art will appreciate that the solutions of the embodiments of the present invention can be applied to other wireless communication networks, such as a Universal Mobile Telecommunications System (UMTS) network, or a 5G network, or a subsequent evolution network.

[0049] Figure 1 An example of a communication network using D2D technology is shown. Figure 1 As shown, UEs (UE1, UE2, UE3) under the coverage of the base station can communicate with the base station, and D2D links can also be established between the UEs for communication. Figure 1 In the example, when the UE is located at the edge of the cell (such as UE1), the communication quality between the UE and the base station is poor, while the communication quality between UE2 or UE3 and the base station may be good. Therefore, UE2 or UE3 can be used as a relay node to transfer the communication between UE1 and the base station, thereby ensuring the communication quality between UE1 and the base station.

[0050] To facilitate understanding, some terms involved in this application are explained below.

[0051] User equipment (UE) is a terminal device with communication function, which may include handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems with wireless communication function. User equipment may be called different names in different networks, such as: terminal, mobile station, subscriber unit, station, cellular phone, personal digital assistant, wireless modem, wireless communication device, handheld device, laptop, cordless phone, wireless local loop station, etc. For the convenience of description, it is referred to as user equipment or UE in this application.

[0052] A user equipment that provides a relay function may also be referred to as a user equipment relay (UE-relay for short).

[0053] Figure 2 A schematic diagram of the structure of a user device is provided. For ease of explanation, Figure 2 Only the main components of the user equipment are shown. Figure 2As shown, the user equipment 100 includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used to process the communication protocol and communication data, and to control the entire user equipment, execute software programs, and process the data of the software programs. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals. The antenna is mainly used to transmit and receive radio frequency signals in the form of electromagnetic waves. The input-output devices, such as a touch screen, a display screen, a keyboard, etc., are mainly used to receive data input by the user and output data to the user. Those skilled in the art will understand that Figure 2 The structure of the user equipment shown can be applied to Figure 1 UE1, UE2 and UE3 in it.

[0054] When the user device is turned on, the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the RF circuit. The RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the user device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data.

[0055] Those skilled in the art will appreciate that for ease of description, Figure 2 Only one memory and processor are shown. In an actual user equipment, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiment of the present invention.

[0056] As an optional implementation, the processor may include a baseband processor and a central processing unit. The baseband processor is mainly used to process the communication protocol and communication data, and the central processing unit is mainly used to control the entire user equipment, execute software programs, and process software program data. Figure 2 The processor in the UE integrates the functions of the baseband processor and the central processor. Those skilled in the art will appreciate that the baseband processor and the central processor may also be independent processors interconnected by a bus or other technology. Those skilled in the art will appreciate that the user equipment may include multiple baseband processors to adapt to different network standards. Those skilled in the art will appreciate that the user equipment may include multiple central processors to enhance its processing capabilities.

[0057] Those skilled in the art will appreciate that various components of the user equipment may be connected via various buses.

[0058] Those skilled in the art will appreciate that the baseband processor may also be referred to as a baseband processing circuit or a baseband processing chip.

[0059] Those skilled in the art will appreciate that the central processing unit may also be referred to as a central processing circuit or a central processing chip.

[0060] Those skilled in the art will appreciate that the function of processing the communication protocol and communication data may be built into the processor, or may be stored in a storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.

[0061] For example, in the embodiments of the invention, the antenna and the radio frequency circuit with transceiver functions may be regarded as the transceiver unit of the user equipment, and the processor with processing function may be regarded as the processing unit of the user equipment. Figure 2 As shown, the user equipment 100 includes a transceiver unit 101 and a processing unit 102. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, etc. Optionally, a device for implementing a receiving function in the transceiver unit 101 may be regarded as a receiving unit, and a device for implementing a sending function in the transceiver unit 101 may be regarded as a sending unit, that is, the transceiver unit 101 includes a receiving unit and a sending unit. For example, the receiving unit may also be referred to as a receiver, a receiver, a receiving circuit, etc., and the sending unit may be referred to as a transmitter, a transmitter, or a transmitting circuit, etc.

[0062] A base station (BS), also known as a base station device, is a device deployed in a wireless access network to provide wireless communication functions. The base station in an LTE network is called an evolved Node B (eNB or eNodeB).

[0063] Figure 3 A structural schematic diagram of a base station is provided. Figure 3 The base station shown may be a split base station, for example Figure 3 The left side shows a distributed base station including antennas (English: antennas), remote radio units (English: remote radio units, referred to as: RRU) and baseband units (English: baseband units, referred to as: BBU). Figure 3 The base station shown may also be an integrated base station, e.g. Figure 3The small cell shown on the right. Generally speaking, a base station includes part 201 and part 202. Part 201 is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals into baseband signals; part 202 is mainly used for baseband processing and controlling the base station. Part 201 can usually be called a transceiver unit, a transceiver, a transceiver circuit, a transceiver, etc. Part 202 can usually be called a processing unit. Usually, part 202 is the control center of the base station.

[0064] like Figure 3 As shown, as an optional implementation, part 201 may include an antenna and a radio frequency unit, wherein the radio frequency unit is mainly used for radio frequency processing. Optionally, the device used to implement the receiving function in part 201 may be regarded as a receiving unit, and the device used to implement the sending function may be regarded as a sending unit, that is, part 201 includes a receiving unit and a sending unit. Exemplarily, the receiving unit may also be referred to as a receiver, a receiver, a receiving circuit, etc., and the sending unit may be referred to as a transmitter, a transmitter, or a transmitting circuit, etc.

[0065] like Figure 3 As shown, as an optional implementation, part 202 may include one or more boards, each of which may include a processor and a memory, and the processor is used to read and execute the program in the memory to implement the baseband processing function and control the base station. If there are multiple boards, the boards can be interconnected to increase the processing capacity.

[0066] As another optional implementation, with the development of system-on-chip (SoC) technology, the functions of part 202 and part 201 can be implemented by SoC technology, that is, by a base station function chip, which integrates a processor, a memory, an antenna and other devices. The program of the base station related functions is stored in the memory, and the processor executes the program to realize the related functions of the base station.

[0067] In such Figure 1 In the network shown, UE1 can communicate with the base station through UE2 through D2D technology, that is, both uplink data and downlink data of UE1 can interact with the base station through UE2. Considering that the signal quality between UE2 and the base station or UE1 may deteriorate due to the movement of UE2, and it may also shut down or fail during the relay process, the relay function implemented by the user equipment may reduce the reliability of the network.

[0068] The embodiment of the present invention provides a data transmission method, such as Figure 4As shown, in part S401, the UE sends uplink data to the base station through the UE-relay. When the UE relay is used to relay uplink data, it can also be called uplink UE-relay or uplink UE-relay. That is to say, the transmission path for the UE's uplink data is UE→(uplink UE-relay)→BS. As an optional implementation of S401, the UE's sending unit can be used to send uplink data to the base station through the UE-relay, and the base station's transceiver unit (or the receiving unit in the base station's transceiver unit) can be used to receive the UE's uplink data through the UE-relay.

[0069] In part S402, the UE receives downlink data sent by the base station. As an optional implementation of S402, the receiving unit of the UE can be used to receive downlink data sent by the base station, and the transceiver unit of the base station (or the sending unit of the transceiver unit of the base station) can be used to send downlink data to the UE.

[0070] Specifically, in one example, the UE can receive downlink data sent by the base station from the base station, that is, the transmission path of the downlink data is BS→UE, and the uplink data transmission path is UE→(uplink UE-relay)→BS. Figure 1 In the network shown, it is assumed that UE1 is Figure 3 In the example, the uplink UE-relay can be any UE with relay function in the network, such as UE2 or UE3. In this example, the uplink data transmission path and the downlink data transmission path between the UE and the base station are different. Only the UE-relay is used in the uplink data link, so as to reduce the impact of the UE-relay on the network reliability and improve the network reliability using the D2D technology.

[0071] In another example, the UE may also receive the downlink data sent by the base station through UE-relay. When UE-relay is used to relay downlink data. It may also be called downlink UE-relay or downlink UE-relay. That is, in this example, the uplink data transmission path is UE→(uplink UE-relay)→BS, and the downlink data transmission path is BS→(downlink UE-relay)→UE. As an optional implementation, the receiving unit of the UE may be used to receive the downlink data sent by the base station through UE-relay, and the transceiver unit of the base station (or the sending unit of the transceiver unit of the base station) may be used to send downlink data to the downlink UE-relay. In addition, in this example, since the uplink and downlink transmissions of the UE are respectively performed through uplink UE-relay and downlink UE-relay, when the UE leaves the coverage of the base station, the UE can still perform uplink and downlink transmissions with the base station through uplink UE-relay and downlink UE-relay. In other words, the communication distance between the UE and the base station is increased.

[0072] The downlink UE-relay and the uplink UE-relay are performed by different user equipments. Figure 1 In the network shown, UE1 is assumed to be the UE, the downlink UE-relay is UE2, and the uplink UE-relay is another UE different from UE2, such as UE3. In this example, different UE-relays are used as uplink UE-relay and downlink UE-relay in uplink and downlink transmission, respectively, which can avoid the impact of the movement or communication failure of a single UE-relay on the communication between the UE and the base station, thereby improving the reliability of the network using D2D technology.

[0073] Preferably, the communication quality between the downlink UE-relay and the base station is better than the communication quality between the UE and the base station, for example, the quality of service (QoS) is better, which can improve the quality of the downlink transmission of the UE. Of course, the present invention is not limited to this.

[0074] Preferably, the distance between the UE and the uplink UE-relay can be smaller than the distance between the UE and the base station. In this way, without considering other factors affecting signal quality, the transmission power required for the UE to send uplink data to the uplink UE-relay is smaller than the transmission power required to send uplink data to the base station, thereby helping to reduce the power consumption of the UE and achieve power saving. Optionally, after receiving the uplink data sent by the UE, the uplink UE-relay can send a downlink response to the uplink data, such as ACK / NACK, to the UE. As an optional implementation, the UE's receiving unit can be used to receive the downlink response. Those skilled in the art will understand that a response can also be expressed as a response.

[0075] Optionally, after receiving the downlink data forwarded by the downlink UE-relay, the UE may send a response to the downlink data, such as ACK / NACK, to the downlink UE-relay. Exemplarily, the sending unit of the UE may be configured to send the response to the downlink UE-relay.

[0076] Optionally, the communication between the UE and the user equipment relay (eg, uplink UE-relay, downlink UE-relay) may be carried out in a unicast or broadcast manner.

[0077] When the UE receives the downlink data sent by the base station, the UE shall send a response to the downlink data to the base station on the PUCCH resources allocated by the base station to the UE, so that the base station can know that the response is sent by the UE for the downlink data. Those skilled in the art should understand that the response can be understood as a type of uplink data sent by the UE to the base station.

[0078] Preferably, the UE may send a first indication message to the uplink UE-relay, and the first indication message is used to indicate the PUCCH resources corresponding to the UE. As an optional implementation, the sending unit of the UE may be used to send the above-mentioned first indication message. Those skilled in the art may understand that the PUCCH resources corresponding to the UE may be expressed as PUCCH resources allocated to the UE, or PUCCH resources configured for the UE. After the uplink UE-relay receives the PUCCH resources, it uses the PUCCH resources to send a response of the UE to the base station. When the base station receives the response on the PUCCH resource, the base station will regard it as a response to the downlink data sent by the UE.

[0079] As an optional implementation manner, the first indication information may include: CCE and Among them, n CCE It is used to indicate the number of the first control channel element (CCE) used to indicate downlink transmission in the physical downlink control channel (PDCCH). Used to indicate a UE-specific PUCCH ACK / NACK offset or used to indicate a PUCCH format 1a / 1b starting offset for subframe set K2.

[0080] As an optional implementation manner, the first indication information may include: ECCE,q , Δ ARO and Among them, n ECCE,q Used to indicate the first ECCE (Enhanced Control Channel Element) number used to transmit the corresponding DCI (Downlink Control Information) in EPDCCH-PRB-Set q (EPDCCH corresponding PRB set q, where EPDCCH is enhanced PDCCH, and the Chinese expression is enhanced physical downlink control channel). Δ ARO Used to indicate the value corresponding to the HARQ-ACK resource offset field in the DCI format (specifically Δ ARO The value of can refer to Table 1). Used to indicate the starting offset of the PUCCH resources corresponding to EPDCCH-PRB-Setq.

[0081]

[0082] Table 1: Mapping of ACK / NACK Resource offset Field in DCI format 1A / 1B / 1D / 1 / 2A / 2 / 2B / 2C / 2D toΔ ARO values ​​(the ACK / NACK resource offset field in the downlink control information format 1A / 1B / 1D / 1 / 2A / 2 / 2B / 2C / 2D is mapped to Δ ARO value)

[0083] As an optional implementation manner, the first indication information may include: ECCE,q , Δ ARO , and n', where n ECCE,q , Δ AROand See the above content and no further description will be given here. Where n' is used to indicate the value corresponding to the antenna port used for centralized EPDCCH transmission (the specific value of n' can be referred to Table 2).

[0084]

[0085] Table 2: Antenna port to use for localized EPDCCH transmission

[0086] Exemplarily, the first indication information includes the above parameters n CCE , n ECCE,q , Δ ARO , The specific meaning and usage of and n' can be found in Section 10.1.2.1 of 3GPP standard 3GPP TS 36.213 v12.5.0, which will not be elaborated here.

[0087] Those skilled in the art will appreciate that the first indication information includes the above parameters n CCE , n ECCE,q , Δ ARO , and n' can be used in LTE FDD (Chinese: frequency division duplex, English: frequency division duplex) network.

[0088] Those skilled in the art can understand that the following parameters included in the first indication information can be used in an LTE TDD (Chinese: time division duplex, English: time division duplex) network.

[0089] As an optional implementation, the first indication information may include: M, m, n CCE and

[0090] As an optional implementation manner, the first indication information may include: ECCE,q , m, and Δ ARO .

[0091] As an optional implementation manner, the first indication information may include: ECCE,q , m,n',Δ ARO and

[0092] Exemplarily, the first indication information includes parameters M, m, n that can be used in the LTE TDD network. CCE , n ECCE，q , m,n',Δ ARO and For the specific meaning and usage of , please refer to Chapter 10.1.3.1 of 3GPP standard 3GPP TS 36.213v12.5.0, which will not be repeated here.

[0093] Optionally, when the UE needs to send a periodic channel quality indication (CQI) to the base station while sending a response to the base station, the first indication information may also include: Used to indicate the index of the CQI allocated to the UE. Through the first indication information, the uplink UE-relay can send the UE's response to the uplink data and the CQI fed back by the UE to the base station.

[0094] Preferably, in order to enable the base station to correctly receive the above response (or the above response and periodic CQI) to the downlink data forwarded by the uplink UE-relay on the PUCCH resource, the base station can receive the response (or the response and periodic CQI) on the PUCCH resource after delaying m transmission time intervals (English: transmission time interval, abbreviated as: TTI). Those skilled in the art can understand that the response (or the response and periodic CQI) here can be understood as a kind of uplink data sent by the UE to the base station.

[0095] As an optional implementation, the transceiver unit of the base station (or the receiving unit of the transceiver unit of the base station) can be used to receive the uplink data on the PUCCH resource, and further can delay receiving the uplink data on the PUCCH resource after m TTIs.

[0096] Preferably, m TTIs are greater than or equal to the time required for the user equipment to send the second indication information and the response to the downlink data to the uplink UE-relay. This has a small impact on the HARQ process.

[0097] After the uplink UE-relay forwards the uplink data of the UE to the base station, the base station will send a response to the uplink data. Since the uplink data is sent by the uplink UE-relay to the base station, the base station will send the response on the physical hybrid automatic repeat request indicator channel (English: physical hybrid automatic repeat request indicator channel, abbreviated as: PHICH) resource corresponding to the uplink UE-relay so that the uplink UE-relay can receive the response. Those skilled in the art can understand that the PHICH resource corresponding to the uplink UE-relay can be expressed as the PHICH resource allocated to the uplink UE-relay, or can be expressed as the PHICH resource configured for the uplink UE-relay.

[0098] Preferably, in order to enable the UE to directly receive the base station's response to the uplink data from the base station, the uplink UE-relay may inform the UE of its corresponding PHICH resource, and the UE may receive the response to the uplink data from the base station according to the PHICH resource. For example, the receiving unit of the UE may be used to receive the second indication information from the uplink UE-relay, and the second indication information is used to indicate the PHICH resource corresponding to the uplink UE-relay. The second indication information may include n DMRS as well as n DMRS Used to indicate the offset of DMRS. It is used to indicate the index of the minimum PRB for uplink transmission. Those skilled in the art should understand that, since the UE directly receives the response from the base station, the response can be understood as a kind of downlink data sent by the base station to the UE.

[0099] The following combination Figure 1 The network shown is Figure 4 The method shown is further explained in Scenario A and Scenario B.

[0100] Scenario A: The uplink UE-relay is UE2, the user equipment UE1 sends uplink data to the base station through UE2, and UE1 directly receives downlink data from the base station.

[0101] like Figure 5 As shown:

[0102] S501: UE1 sends uplink data to UE2.

[0103] Among them, UE1 can send uplink data to UE2 in a unicast or broadcast manner.

[0104] Optionally, S502: UE2 sends a response to the uplink data to UE1.

[0105] Exemplarily, the response may be ACK or NACK. When UE1 receives NACK, UE1 may send uplink data to UE2 again.

[0106] S503: UE2 sends uplink data to the base station.

[0107] Exemplarily, UE2 may send uplink data to the base station through a physical uplink shared channel (English: physical uplink shared channel, abbreviated as: PUSCH) resource configured by the base station for UE2.

[0108] Exemplarily, the PUSCH resource may be obtained by UE2 through a scheduling request (English: scheduling request, abbreviated: SR).

[0109] S505: The base station sends a response to the uplink data.

[0110] Exemplarily, the base station sends the above response according to the PHICH resources allocated to UE2.

[0111] The above response sent by the base station on the PHICH resource can be received by UE2 (see S5051 ) and can also be received by UE1 (see S504 and S5052 ).

[0112] Optionally, S5051: UE2 receives a response from the base station to the uplink data on the PHICH resources allocated by the base station to UE2.

[0113] Optionally, S504: UE2 sends second indication information to UE1, where the second indication information is used to indicate the above PHICH resource. In this way, UE1 can receive a response from the base station to the uplink data on the PHICH resource. The second indication information can refer to Figure 4 The second indication information in is not described here.

[0114] Optionally, S5052: UE1 receives a response from the base station to the uplink data on the PHICH resource allocated by the base station to UE2.

[0115] The above S501-S505 exemplarily provide a specific implementation of S402.

[0116] The following S506-S510 exemplarily provide a specific implementation of S401.

[0117] S506: The base station sends downlink data to UE1;

[0118] Exemplarily, the base station sends downlink data to UE1 via a downlink shared physical channel (English: physical downlink sharedchannel, abbreviated as: PDSCH) resource.

[0119] S507: UE1 sends first indication information to UE2.

[0120] The first indication information is used to indicate the PUCCH resource corresponding to UE1, that is, the PUCCH resource configured for UE1. Figure 4 The first indication information in is not repeated here.

[0121] S508: UE1 sends a response to the downlink data to UE2.

[0122] Optionally, UE1 may also send a periodic CQI to UE2.

[0123] There is no sequence between S507 and S508, and UE1 may send the second indication information, a response to downlink data, or a periodic CQI to UE2 by broadcast or unicast.

[0124] Optionally, S509: UE2 sends a response to the first indication information, a response to the downlink data, or a response to the periodic CQI to UE1.

[0125] S510: UE2 sends UE1's response to the downlink data to the base station.

[0126] Exemplarily, UE2 sends UE1's response to the downlink data to the base station according to the PUCCH resources configured for UE1.

[0127] pass Figure 5 From the description of the method shown, it can be seen that transmitting uplink and downlink data through different transmission paths can reduce the impact of user equipment relay on transmission reliability. When an uplink failure occurs, the base station can still contact the user equipment through the downlink, so that subsequent remediation can be carried out, thereby improving network reliability.

[0128] Scenario B: The downlink UE-relay is UE3, the uplink UE-realy is UE2, UE1 sends uplink data to the base station through UE2, and receives downlink data from the base station through UE3, wherein UE1 can be located within the coverage of the base station or outside the coverage of the base station.

[0129] like Figure 6 As shown:

[0130] S601: UE1 sends uplink data through UE2.

[0131] For example, an example of UE1 sending uplink data through UE2 can be found in S501-S505, which will not be described in detail here.

[0132] Exemplarily, S602-S605 exemplarily provide one of the specific implementations of S401.

[0133] S602: The base station sends downlink data to UE3.

[0134] Exemplarily, S602 sends downlink data to UE3 via PDSCH resources.

[0135] S603: UE3 sends a response of UE3 to the downlink data to the base station.

[0136] Exemplarily, UE3 may send a response to the downlink data to the base station according to the PUCCH resources configured for UE3.

[0137] S604: UE3 sends downlink data to UE1.

[0138] Exemplarily, UE3 may send the downlink data to UE1 in a broadcast or unicast manner.

[0139] Optionally, S605: UE1 sends a response of UE1 to the downlink data to UE3.

[0140] The embodiment of the present invention forwards uplink data and downlink data of a user equipment respectively through different user equipment relays, which can reduce the impact of a single user equipment relay failure on the network and improve the reliability of the network.

[0141] Those skilled in the art will appreciate that the embodiment of the present invention further provides a user equipment, the structure of which can refer to Figure 2 The mechanism for achieving the purpose of the embodiment of the present invention can refer to UE1 in the above embodiment, and will not be described in detail here.

[0142] Those skilled in the art will appreciate that the embodiment of the present invention further provides a user equipment as a user equipment relay, and its structure can refer to Figure 2 The mechanism for achieving the purpose of the embodiment of the present invention can refer to UE2 in the above embodiment, which will not be described in detail here.

[0143] Those skilled in the art will appreciate that the present invention also provides a base station, the structure of which can refer to Figure 3 The mechanism for achieving the purpose of the embodiment of the present invention can refer to the base station in the above embodiment and will not be described in detail here.

[0144] Those skilled in the art can understand that the embodiment of the present invention also provides a data transmission system to achieve the purpose of the embodiment of the present invention, and the system may include UE1 and UE2, and further may include a base station or UE3. The mechanism of the system implementing the method provided by the embodiment of the present invention can be referred to the above embodiment, and will not be repeated here.

[0145] It is also known to those skilled in the art that the various illustrative logical blocks and steps listed in the embodiments of the present invention can be implemented by electronic hardware, computer software, or a combination of the two. Whether such functions are implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art can use various methods to implement the functions described for each specific application, but such implementation should not be understood as exceeding the scope of protection of the embodiments of the present invention.

[0146] The various illustrative logic units and circuits described in the embodiments of the present invention can be implemented or operated by a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of the above. The general-purpose processor can be a microprocessor, and optionally, the general-purpose processor can also be any conventional processor, controller, microcontroller or state machine. The processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0147] The steps of the method or algorithm described in the embodiments of the present invention may be directly embedded in hardware, a software unit executed by a processor, or a combination of the two. The software unit may be stored in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium in the art. Exemplarily, the storage medium may be connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Optionally, the storage medium may also be integrated into the processor. The processor and the storage medium may be arranged in an ASIC, and the ASIC may be arranged in a UE. Optionally, the processor and the storage medium may also be arranged in different components in the UE.

[0148] In one or more exemplary designs, the above functions described in the embodiments of the present invention can be implemented in hardware, software, firmware or any combination of the three. If implemented in software, these functions can be stored on a computer-readable medium, or transmitted in the form of one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media that facilitate the transfer of computer programs from one place to another. The storage medium can be any available medium that can be accessed by any general or special computer. For example, such computer-readable media can include but are not limited to RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage devices, or any other medium that can be used to carry or store program codes in the form of instructions or data structures and other forms that can be read by general or special computers, or general or special processors. In addition, any connection can be appropriately defined as a computer-readable medium, for example, if the software is transmitted from a website site, server or other remote resource through a coaxial cable, fiber optic computer, twisted pair, digital subscriber line (DSL) or wirelessly, such as infrared, wireless and microwave, it is also included in the defined computer-readable medium. The disk and disc include compact disk, laser disk, optical disk, DVD, floppy disk and blue-ray disk. Disks usually copy data magnetically, while discs usually copy data optically with lasers. The above combination can also be included in computer readable media.

[0149] The above description of the specification of the present invention can make any technical personnel in the field use or implement the content of the present invention, and any modification based on the disclosed content should be considered obvious in the field. The basic principles described in the present invention can be applied to other variations without departing from the essence and scope of the invention of the present invention. Therefore, the content disclosed in the present invention is not limited to the described embodiments and designs, but can also be extended to the maximum scope consistent with the principles of the present invention and the disclosed new features.

Claims

1. A data transmission method, characterized in that: include: The user equipment UE sends uplink data to the base station through the uplink user equipment relay uplink UE-relay; The UE receives downlink data from the base station; The UE sends first indication information to the uplink UE-relay, where the first indication information is used to indicate an uplink transmission resource corresponding to the UE, so that the uplink UE-relay sends the uplink data to the base station according to the uplink transmission resource; The UE receives second indication information from the uplink UE-relay, where the second indication information is used to indicate a downlink transmission resource corresponding to the uplink UE-relay; The UE receiving the downlink data from the base station includes: the UE receiving the downlink data from the base station according to the downlink transmission resource.

2. The method according to claim 1, characterized in that The uplink transmission resources include physical uplink control channel PUCCH resources; The first indication information includes n CCE as well as Among them, n CCE It is used to indicate the first control channel element CCE number in the physical downlink control channel PDCCH used to indicate downlink transmission. Used to indicate the UE-specific PUCCH ACK / NACK resource offset or used to indicate the PUCCH format 1a / 1b starting offset for subframe set K2.

3. The method according to claim 1, characterized in that The downlink transmission resources include physical hybrid automatic repeat request indicator channel PHICH resources; The second indication information includes n DMRS and Among them, n DMRS Used to indicate the bias of the demodulation reference signal DMRS, Used to indicate the index of the smallest physical resource block (PRB) for uplink transmission.

4. The method according to any one of claims 1 to 3, characterized in that: Also includes: The UE receives, from the uplink UE-relay, a response from the uplink UE-relay to the uplink data.

5. A data transmission method, characterized in that: include: The base station receives uplink data of the user equipment UE through the uplink user equipment relay uplink UE-relay; wherein the UE sends first indication information to the uplink UE-relay, and the first indication information is used to indicate the uplink transmission resource corresponding to the UE, so that the uplink UE-relay sends the uplink data to the base station according to the uplink transmission resource; the UE receives second indication information from the uplink UE-relay, and the second indication information is used to indicate the downlink transmission resource corresponding to the uplink UE-relay; The base station sends downlink data to the UE based on the downlink transmission resources corresponding to the uplink UE-relay.

6. The method according to claim 5, characterized in that The base station receiving uplink data of the user equipment UE through the uplink UE-relay includes: The base station receives the uplink data of the UE from the uplink UE-relay according to the uplink transmission resource corresponding to the UE.

7. The method according to claim 6, characterized in that The base station receiving the uplink data of the UE from the uplink UE-relay according to the uplink transmission resource corresponding to the UE includes: The base station receives the uplink data from the uplink UE-relay according to the uplink transmission resource after delaying m transmission time intervals TTI; wherein m is a positive integer.

8. A user equipment device, characterized in that: include: A processor, configured to read and execute instructions in a memory to implement the method according to any one of claims 1 to 4.

9. A base station device, characterized in that: include: A processor, configured to read and execute instructions in a memory to implement a method as described in any one of claims 5 to 7.

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