WO2020199088A1 - 数据传输的方法及通信设备 - Google Patents

数据传输的方法及通信设备 Download PDF

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Publication number
WO2020199088A1
WO2020199088A1 PCT/CN2019/080848 CN2019080848W WO2020199088A1 WO 2020199088 A1 WO2020199088 A1 WO 2020199088A1 CN 2019080848 W CN2019080848 W CN 2019080848W WO 2020199088 A1 WO2020199088 A1 WO 2020199088A1
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interface
downlink
uplink
physical channel
physical
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English (en)
French (fr)
Inventor
王宇晨
吴毅凌
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2019/080848 priority Critical patent/WO2020199088A1/zh
Priority to CN201980091859.9A priority patent/CN113424654B/zh
Publication of WO2020199088A1 publication Critical patent/WO2020199088A1/zh
Anticipated expiration legal-status Critical
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    • 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

Definitions

  • This application relates to the field of communications, and more specifically, to a data transmission method and communication device.
  • the wireless multi-hop technology is not the communication between the base station and the user equipment in the traditional sense, but the indirect communication between the base station and the user equipment is realized by means of one or more relay devices.
  • the characteristic is that the direct transmission path in the traditional sense can be divided into multiple short paths to transmit information.
  • LTE long term evolution
  • the mobile communication system terrestrial access network and user equipment (UMTS terrestrial radio access network and user equipment, Uu) interfaces are usually used for data transmission between the base station and the relay equipment.
  • PC5 (ProSe Control 5) interface is usually used for data transmission between the relay device and the user equipment or other relay devices. Therefore, for the relay device, it is necessary to be able to simultaneously process the data communicated with the upper-level node and the data communicated with the lower-level node, which places higher requirements on the processing capability of the relay device.
  • the present application provides a data transmission method, relay device, and user equipment, which can ensure normal data transmission in a multi-hop network while reducing the complexity of processing data by the device and the cost of equipment.
  • a data transmission method including: a first device receives a first indication message sent by a second device, where the first indication message is used to instruct the first device to use a first interface or a second device.
  • the interface performs data transmission with the second device, where, when the second device is a base station, the first indication message instructs the first device to perform data transmission with the second device through the first interface
  • the first device sends a second instruction message to a third device, the second instruction message is used to instruct the third device to perform data transmission with the first device through the first interface or the second interface, wherein, at least one uplink physical channel of the second interface and at least one downlink physical channel of the first interface use the same modulation mode, and the uplink physical channel and the downlink physical channel of the first interface use different modulation modes.
  • the interface between the first device and the second device and the first device and the third device can be flexibly selected for data transmission, so that the first device can realize the reception on the parent link and the child link Process reuse, reducing equipment complexity and cost.
  • the uplink physical shared channel of the second interface and the downlink physical shared channel of the first interface use the same coding mode; and/or the second The uplink physical channel carrying the control information of the interface and the downlink physical channel carrying the control information of the first interface adopt the same coding mode.
  • the first device can realize the multiplexing of the encoding and decoding process.
  • the uplink and downlink physical channels of the first interface adopt different encoding methods, so that the data encoding method can be compared with that of the first device and The decoding capability of the second device is compatible.
  • the uplink physical shared channel of the second interface and the downlink physical shared channel of the second interface use the same coding mode; and/or the second The uplink physical channel carrying the control information of the interface and the downlink physical channel carrying the control information of the second interface adopt the same coding mode.
  • the physical resource used for downlink transmission of the first interface is the same as the physical resource used for downlink of the second interface; and/or the first interface
  • the physical resource used for uplink transmission of the second interface is the same as the physical resource used for downlink of the second interface.
  • the physical resources include time domain resources and/or frequency domain resources.
  • the time domain resource includes: the time used for transmission in each transmission time interval TTI, the number of symbols in each TTI, and the number of symbols in each TTI. Symbol time length.
  • the symbol time length includes the cyclic prefix CP time length of the symbol.
  • the frequency domain resources include: the number of subcarriers of the resource block and the bandwidth of the subcarrier at a specific position of the resource block, wherein the resource block includes Carrier or physical resource block.
  • the first indication message or the second indication message includes at least one of the following: a synchronization channel base sequence, a period of a synchronization signal, and a synchronization signal in a fixed time period Offset, physical broadcast channel PBCH time-frequency position, broadcast message, system message or radio resource control RRC message.
  • the at least one downlink reference signal of the first interface and the uplink reference signal of the second interface adopt the same base sequence and/or resource block RE mapping mode .
  • At least one uplink physical channel and downlink physical channel of the second interface and the downlink physical channel of the first interface use the same order mapping table and/ Or transport block size TBS table.
  • the first interface and the second interface adopt different timing advance offsets N TA-offset .
  • the second interface when the preset interval between adjacent radio frames of the first interface is T, the second interface adopts a time advance offset N TA -offset makes the preset interval between adjacent radio frames of the second interface also T.
  • a communication device including: a receiving unit configured to receive a first indication message sent by a second device, where the first indication message is used to instruct the first device to communicate with each other through a first interface or a second interface The second device performs data transmission, where when the second device is a base station, the first indication message instructs the first device to perform data transmission with the second device through the first interface; and A unit, configured to send a second instruction message to a third device, where the second instruction message is used to instruct the third device to perform data transmission with the first device through the first interface or the second interface, where: At least one uplink physical channel of the second interface and at least one downlink physical channel of the first interface use the same modulation mode, and the uplink physical channel and the downlink physical channel of the first interface use different modulation modes.
  • the uplink physical shared channel of the second interface and the downlink physical shared channel of the first interface use the same coding mode; and/or the second The uplink physical channel carrying the control information of the interface and the downlink physical channel carrying the control information of the first interface adopt the same coding mode.
  • the uplink physical shared channel of the second interface and the downlink physical shared channel of the second interface use the same coding mode; and/or the second The uplink physical channel carrying the control information of the interface and the downlink physical channel carrying the control information of the second interface adopt the same coding mode.
  • the physical resource used for downlink transmission of the first interface is the same as the physical resource used for downlink of the second interface; and/or the first interface
  • the physical resource used for uplink transmission of the second interface is the same as the physical resource used for downlink of the second interface.
  • the physical resources include time domain resources and/or frequency domain resources.
  • the time domain resource includes: the time used for transmission in each transmission time interval TTI, the number of symbols in each TTI, and the number of symbols in each TTI. Symbol time length.
  • the symbol time length includes the cyclic prefix CP time length of the symbol.
  • the frequency domain resource includes: the number of subcarriers of the resource block and the bandwidth of the subcarrier at a specific position of the resource block, wherein the resource block includes Carrier or physical resource block.
  • the first indication message or the second indication message includes at least one of the following: a synchronization channel base sequence, a period of a synchronization signal, and a synchronization signal in a fixed time period Offset, physical broadcast channel PBCH time-frequency position, broadcast message, system message or radio resource control RRC message.
  • the at least one downlink reference signal of the first interface and the uplink reference signal of the second interface use the same base sequence and/or resource block RE mapping mode .
  • At least one uplink physical channel and downlink physical channel of the second interface and the downlink physical channel of the first interface use the same order mapping table and/or Transmission block size TBS table.
  • the first interface and the second interface adopt different timing advance offsets N TA-offset .
  • the second interface when the preset interval between adjacent radio frames of the first interface is T, the second interface adopts a time advance offset N TA -offset makes the preset interval between adjacent radio frames of the second interface also T.
  • Fig. 1 is a schematic diagram of a multi-hop network system provided by an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a data transmission method provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of time domain resources used by different interfaces provided by embodiments of the present application.
  • Fig. 4 is a schematic diagram of frame structures of different interfaces provided by embodiments of the present application.
  • FIG. 5 is a schematic diagram of time alignment provided by an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a reference signal mapping manner related to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of another reference signal mapping manner involved in an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA broadband code Wideband code division multiple access
  • GPRS general packet radio service
  • LTE FDD frequency division duplex
  • Time Division Duplex Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • 5G 5th generation
  • new radio new radio
  • V2X vehicle-to-everything
  • LTE-V long-term evolution-based vehicle-to-vehicle communication technology
  • vehicle to vehicle vehicle to vehicle
  • V2V vehicle-to-everything
  • MTC manual semi-automatic toll collection system
  • IoT Internet of things
  • LTE machine-to-machine LTE-machine to machine
  • LTE-M machine-to-machine (machine to machine) to machine
  • M2M etc.
  • UE User equipment in the embodiments of this application may refer to terminal equipment, access terminals, user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless Communication equipment, user agent or user device.
  • the terminal device can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), and a wireless communication Functional handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network or future evolution of the public land mobile network (PLMN) Terminal equipment, etc., this embodiment of the present application does not limit this.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • PLMN public land mobile network
  • the base station can be a base transceiver station (BTS) in GSM or CDMA, a base station (NodeB, NB) in WCDMA, or an evolutionary base station (Evolutional NodeB) in LTE. , ENodeB), the base station gNB in 5G, or other network equipment with base station functions, this application is not limited to this.
  • BTS base transceiver station
  • NodeB, NB base station
  • Evolutional NodeB evolution base station
  • ENodeB evolution base station
  • the base station gNB in 5G or other network equipment with base station functions
  • the user equipment, relay device, or network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also referred to as main memory).
  • the operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system.
  • the application layer includes applications such as browsers, address books, word processing software, and instant messaging software.
  • the embodiments of the application do not specifically limit the specific structure of the execution subject of the methods provided in the embodiments of the application, as long as the program that records the codes of the methods provided in the embodiments of the application can be provided according to the embodiments of the application.
  • the execution subject of the method provided in the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call and execute the program.
  • Fig. 1 is a schematic diagram of a wireless multi-hop network applicable to an embodiment of the present application.
  • the D2D wireless multi-hop network system 100 shown in FIG. 1 is composed of a base station 101, relay devices 102, 103, and user equipment 104.
  • the base station 101 is a base station that provides services to the user equipment 103, and the relay devices can be in different hops.
  • the relay device whose superior node is the base station is called the first-hop relay device (such as relay device 102), and the relay device whose superior node is other relay devices is called the non-first-hop relay device.
  • the relay device (such as the relay device 103) may be a relay device (such as the relay device 102) whose upper node is a base station.
  • FIG. 1 is only a schematic diagram illustrating the multi-hop network and the various devices that make up the multi-hop network, and does not limit the embodiments of the present application.
  • the number of base stations, relay devices, and user equipment in FIG. There are no restrictions.
  • the number of hops in this application is only for convenience of explanation, and has no limiting effect.
  • a relay device whose superior node is a base station can also become a 0th hop relay device or a second hop relay device.
  • the relay device and the base station can communicate through the Uu interface, and the relay device and the user equipment or the relay device and other relay devices can communicate through the PC5
  • the interface performs side link communication.
  • a Uu interface is used for communication between the relay device 102 and a base station
  • a PC5 interface is used for communication between the relay device 102 and the user equipment 104.
  • the uplink physical channel and the downlink physical channel of the Uu interface use turbo coding, and the modulation method of the uplink physical channel is single carrier frequency division. Multiple access (single-carrier frequency-division multiple, SC-FDM) waveform modulation, and the modulation mode of the downlink physical channel is orthogonal frequency division multiplexing (OFDM) waveform modulation.
  • SC-FDM single-carrier frequency-division multiple
  • OFDM orthogonal frequency division multiplexing
  • both the downlink physical channel of the Uu interface and the physical channel of the PC5 interface for sideline communication use turbo coding. Therefore, the user equipment that needs to access the network has turbo decoding capability, which increases the complexity and complexity of the user equipment. Cost, not suitable for electricity meter reading business.
  • the downlink physical channel of the Uu interface and the physical channel of the PC5 interface for sideline communication use different modulation waveforms, reference signals, mapping resources, etc., so that the first relay device cannot reuse the receiving process and increase the first The complexity of data processing by the relay device and the cost of the first relay device.
  • an embodiment of the present application provides a data transmission method.
  • FIG. 2 shows a schematic flowchart of a data transmission method according to an embodiment of the present application.
  • S201 The first device receives first indication information sent by the second device.
  • the first device is a relay device
  • the second device is a parent node of the first device
  • the second device may be a base station or another relay device.
  • the first indication information is used to instruct the first device to perform data transmission with the second device through the first interface.
  • the first indication information is used to instruct the first device to perform data transmission with the second device through the first interface or the second interface.
  • the first indication information sent by the base station to the first device instructs the first device to perform data transmission with the base station through the first interface;
  • the parent node of the relay device is In the case of other relay devices, the first indication information indicates that the first relay device performs data transmission with the parent node through the first interface or the second interface.
  • the first relay device and the base station can transmit data through the first interface, and the relay device and the relay device or between the relay device and the user equipment can be through the first interface or the second interface. Perform data transfer.
  • S202 The first device sends second indication information to the third device.
  • the first device is a relay device
  • the third device may be a child node of the first device, for example, it may be at least one other relay device or user equipment.
  • the first device sends second instruction information to the third device, where the second instruction information is used to instruct the third device to perform data transmission with the first device through the first interface or the second interface.
  • the first device and the subordinate node of the first device can perform data transmission through the first interface or the second interface.
  • the parent link and the child link of the relay device can flexibly select the interface type for data transmission, for example, the relay device and the base station Communication between the relay device and other relay devices or between the relay device and the user equipment can be through the first interface or the second interface.
  • the embodiment of this application sets the first interface and the second interface so that at least one uplink physical channel of the second interface and the downlink physical channel of the first interface have the same modulation mode, so that the relay device can reuse the parent
  • the receiving process of links and sub-links reduces the complexity and cost of relay equipment.
  • the processing capabilities of a base station and a relay device or user equipment are different.
  • the base station has a relatively strong processing capability, while the relay device or a user equipment may have a relatively weak processing capability. Therefore, when the base station and the relay device or the base station and the user equipment communicate through the first interface, the first interface can satisfy: the uplink physical channel and the downlink physical channel adopt different modulation methods, that is, the uplink and downlink of the first interface There is no pair of uplink and downlink physical channels with the same modulation mode in the physical channels.
  • the downlink physical channel of the first interface and the uplink physical channel of the second interface use the same modulation mode, and the uplink and downlink physical channels of the first interface use different modulation modes.
  • the downlink physical channel of the first interface and the uplink physical channel of the second interface use the same modulation mode, where the downlink physical channel of the first interface may be a downlink physical channel that carries control information, for example, a physical downlink Control channel (physical downlink control channel, PDCCH) or physical hybrid automatic retransmission indicator channel (physical hybrid ARQ channel, PHICH), or narrowband internet of things (NB-IoT) system in the downlink control channel (narrow) physical downlink control channel, NPDCCH);
  • the uplink physical channel of the second interface can be an uplink physical channel that carries control information, for example, it can be an uplink physical control channel (physical uplink control channel, PUCCH) or an uplink physical channel in the NB-IoT system Control channel (narrow physical uplink control channel, NPUCCH) or uplink physical control channel (IAB physical uplink control channel, IPUCCH) involved in the second interface of this application; or, the downlink physical channel of the first interface and the uplink physical channel of the second interface
  • the uplink and downlink physical channels of the first interface adopt different debugging methods.
  • the uplink physical channel of the first interface may adopt SC-FDM waveform modulation
  • the downlink channel may adopt OFDM waveform modulation.
  • the uplink physical channel and downlink physical channel of the first interface may be: PUSCH and PDSCH of the first interface or PUCCH and PDCCH of the first interface, etc.
  • the downlink physical channel of the first interface may also be PHICH.
  • the uplink control channel of the second interface and the downlink control channel of the first interface can use the same coding mode; wherein, the downlink control channel of the second interface can also be PHICH, that is, the PUCCH of the second interface is the same as that of the first interface.
  • the PHICH of the interface adopts the same coding method.
  • the uplink and downlink physical shared channels of the first interface adopt different coding modes respectively; or, the uplink and downlink physical control channels of the first interface adopt different coding modes respectively.
  • the uplink shared physical channel of the first interface adopts turbo coding
  • the downlink shared physical channel may adopt tail-biting convolutional coding.
  • the physical resource used for uplink transmission of the second interface is the same as the physical resource used for downlink transmission of the first interface, and the physical resource may be a time domain resource and/or a frequency domain resource.
  • the physical resources used for uplink and downlink transmission of the first interface are different, and the physical resources may be time domain resources and/or frequency domain resources.
  • the at least one uplink physical channel and downlink physical channel of the second interface and the downlink physical channel of the first interface use the same order mapping table and/or transmission block size (TBS) table.
  • TBS transmission block size
  • the downlink reference signal of the first interface and the uplink reference signal of the second interface adopt the same base sequence and/or resource element (RE) mapping manner.
  • RE resource element
  • the uplink and downlink physical channels of the second interface may use the same modulation and/or coding mode, or the physical resources used for uplink and downlink transmission of the second interface are the same, that is, the uplink and downlink physical channels of the second interface
  • the modulation mode of the first interface is the same as that of the downlink physical channel; and/or the coding mode of the uplink and downlink physical channels of the second interface is the same as the coding mode of the downlink physical channel of the first interface; and/or, the second
  • the physical resources of the interface used for uplink and downlink transmission are the same as the physical resources of the first interface used for downlink transmission.
  • the uplink and downlink physical channels of the second interface may be PUSCH and PDSCH, and the downlink physical channel of the first interface may be PDSCH; or, the uplink and downlink physical channels of the second interface may be PUCCH and PDCCH, and the downlink physical channel of the first interface It can be PDCCH or PHICH.
  • the following introduces the modulation mode, coding mode, and reference signal that can be adopted by the first interface and the second interface of the present application.
  • the uplink physical channel of the first interface may include: PUCCH, PUSCH; the downlink physical channel of the first interface may include: PDCCH, PDSCH, physical broadcast channel (physical broadcast channel) , PBCH), PHICH.
  • the channel coding mode, modulation mode, and reference signal adopted by different uplink physical channels or downlink physical channels of the first interface are shown in Table 1 respectively.
  • the coding methods of PDCCH, PDSCH, and PBCH are all tail-biting convolutional coding
  • the modulation method is OFDM waveform modulation
  • the reference signal is cell reference signal (CRS)
  • PUCCH uses repeated coding method, and SC-FDM waveform modulation , And demodulation reference signal (demodulation reference signal, DMRS) mapping mode
  • PUSCH adopts Turbo coding mode, SC-FDM waveform modulation and DMRS mapping mode.
  • the coding mode, modulation waveform and reference signal adopted by each physical channel are shown in Table 1.
  • mapping modes of CRS and DMRS are different. It can be seen from the modulation mode, coding mode and reference signal of the uplink physical channel and physical downlink channel of the Uu interface that for each uplink physical channel of the Uu interface, there is no downlink physical channel of the Uu interface, so that both meet the coding mode. , Modulation mode and resource mapping are the same.
  • the physical channel of the second interface may be designed.
  • the channel coding mode, modulation mode, and reference signal adopted by different physical channels of the second interface are shown in Table 2.
  • the uplink shared channel (IBA physical uplink shared channel, IPUSCH) in Table 2 has the same substantive function as the PUSCH, and is only used to facilitate the distinction between the uplink shared channel of the interface designed in the embodiment of the present application.
  • the uplink control channel (IBA physical uplink shared channel, IPUSCH) has the same substantive function as the PUCCH, and is only used to facilitate the distinction between the uplink control channel of the interface designed in the embodiment of the application.
  • both the PHICH of the first interface and the IPUCCH of the second interface adopt the RM coding method, OFDM waveform modulation, and the reference signal is CRS. Therefore, the PHICH of the first interface and the IPUCCH of the second interface have the same The encoding method, modulation method and reference signal.
  • the IPUSCH of the second interface and the PDSCHs of the first and second interfaces use tail-biting convolution coding, OFDM waveform and CRS reference signal. Therefore, the PDSCH of the first interface and the PDSCH of the second interface have the same coding method , Modulation method and reference signal.
  • the at least one downlink physical channel of the first interface and the uplink physical channel of the second interface use the same coding mode, modulation mode, and reference signal.
  • the at least one downlink reference signal of the first interface and the uplink reference signal and the downlink reference signal of the second interface adopt the same base sequence and RE mapping mode.
  • the reference signal CRS of the first interface and the reference signal of the second interface relay the node-specific reference signal (IAB-node-specific reference signal, IRS) and the demodulation reference signal (integrated access and backhaul demodulation reference signal) of the second interface. signal, IDMRS)
  • the IDMRS and the DMRS have the same essential functions, which are only used to facilitate the distinction between the demodulation reference signal of the interface designed in the embodiment of the present application.
  • mapping mode of the single antenna port of CRS, IRS or IDMRS can be as shown in Figure 3.
  • mapping mode of the demodulation reference signal (DMRS) used for uplink transmission of the first interface is shown in FIG. 4. It can be seen that the RE mapping modes used by the reference signals for uplink transmission and downlink transmission of the first interface are different.
  • the uplink transmission of the second interface may only support a single antenna port.
  • the downlink physical channel of the first interface and the uplink physical channel of the second interface and the downlink physical channel adopt the same modulation & coding scheme (modulation & coding scheme) to end the mapping table.
  • the downlink physical channel of the first interface can be PDSCH or other downlink physical channels
  • the uplink physical channel and downlink physical channel of the second interface can be IPUSCH, IPDSCH, or other corresponding physical channels. This is not limited.
  • the downlink reference signal of the first interface and the uplink reference signal and the downlink reference signal of the second interface use the same base sequence.
  • the base sequences of the reference signals CRS, IRS, and IDMRS are all formula 1:
  • r l, ns are: l is the symbol number in a slot, n s is the slot number, r l, ns is the value of the base sequence mapped on the corresponding OFDM symbol of the corresponding slot in a frame.
  • m is the absolute force carrier index of the transmission reference signal carrier
  • c is a pseudo-random sequence.
  • DMRS base sequence is Formula 2:
  • u is high-level parameter configuration
  • ⁇ is a phase rotation value
  • IPUSCH and PDSCH can use the same TBS table and scrambling code seed generation formula; or, IPUCCH and PHICH can use the same modulation method, TBS table, and scrambling code seed generation formula; or, any downlink physical channel of the first interface It has the same CRS sequence formula or scrambling code seed generation formula as the second interface uplink physical channel.
  • the uplink physical channel of the second interface when adopts a waveform modulation method, the uplink physical channel of the second interface also adopts the same modulation method, so that the first relay device can reuse the receiving process and improve the data Transmission efficiency.
  • the uplink and downlink physical channels of the first interface can adopt different modulation modes to adapt to the processing capabilities of the base station and the relay device respectively.
  • the uplink and downlink physical channels of the second interface may also adopt the same modulation mode.
  • the uplink and downlink physical channels of the second interface both adopt OFDM waveform modulation.
  • the uplink physical channel and the downlink physical channel of the second interface may both use the same coding mode, modulation mode, reference signal or other mapping resources as the downlink physical channel of the first interface.
  • the uplink physical channel of the second interface and the downlink physical channel of the second interface both use tail-biting convolutional coding; or, the uplink physical channel of the second interface and the downlink physical channel of the second interface both use OFDM waveform modulation, etc. .
  • the same resource used for uplink transmission of the second interface and the resource used for downlink transmission of the first interface may be the same as the uplink time domain resource of the second interface and the downlink time domain resource of the first interface, or it may be the first interface.
  • the uplink frequency domain resource of the second interface is the same as the downlink frequency domain resource of the first interface, or both are the same.
  • the specific description of the uplink transmission and downlink transmission of the second interface that is the same as the downlink transmission of the first interface is similar to the above description of the uplink transmission of the second interface and the downlink transmission of the first interface. Repeat, not repeat them here.
  • the uplink time domain resource of the second interface is the same as the downlink time domain resource of the first interface may include: the time used for uplink transmission in each transmission time interval TTI of the second interface and the time used for each TTI of the first interface
  • the time for downlink transmission is the same, and the number of uplink symbols in each TTI of the second interface is the same as the number of downlink symbols in each TTI of the first interface, and the uplink symbols in each TTI of the second interface are the same as those of the first interface
  • the downlink symbol time length of the corresponding position in each TTI is the same.
  • the time used for uplink transmission in each transmission time interval TTI of the second interface is the same as the time used for downlink transmission in each TTI of the first interface.
  • Figure 5 is a schematic diagram of time-frequency resource transmission in a multi-hop network.
  • the wireless frame of the first interface used by the base station and the first relay device for data transmission (hereinafter referred to as the first wireless frame)
  • the wireless frame of the second interface used by the first relay device and the first device for data transmission The frame structure of the frame (hereinafter referred to as the second wireless frame) is different, wherein the structures of the first wireless frame and the second wireless frame in this embodiment are shown in FIG. 6(a) and FIG. 6(b), respectively.
  • Fig. 6(a) shows the frame structure of the first radio frame.
  • each radio frame with a length of 10 milliseconds (ms) on the first interface includes 5 subframes with a length of 2 ms, in which time slots (slot) #0 and slot #1 are allocated for Downlink (DL) transmission, slot#3, slot#4 are allocated for uplink (uplink, UL) transmission, between the downlink transmission time slot and the uplink transmission time slot is a special time slot slot#2 Among them, the structure of the special time slot includes the downlink pilot time slot (DwPTS), the guard time slot GAP between the uplink and the downlink, and the uplink pilot time slot (UpPTS).
  • DwPTS downlink pilot time slot
  • GAP guard time slot
  • UpPTS uplink pilot time slot
  • Figure 6(b) shows the frame structure of the second radio frame.
  • the time slots slot#0 and slot#1 are used for downlink transmission
  • the time length of slot#0 and slot#1 is 240Ts
  • the special time slot slot includes the time of the downlink pilot time slot.
  • time slots slot#3 and slot#4 are used for uplink transmission.
  • the uplink time domain resource of the second interface is the same as the downlink time domain resource of the first interface may also include: uplink symbols in each TTI of the second interface and downlink symbols in corresponding positions in each TTI of the first interface Have the same cyclic prefix (CP) time length.
  • CP cyclic prefix
  • the same uplink frequency domain resource of the second interface and the downlink frequency domain resource of the first interface may include at least one of the following: the uplink resource block of the second interface has the same number of subcarriers as the downlink resource block of the first interface , And the bandwidth of the subcarrier of the uplink resource block and the subcarrier of the corresponding position of the downlink resource block are the same.
  • the resource block may be a carrier or a physical resource block.
  • At least one uplink physical channel of the second interface is the same as one or more of the coding mode, modulation mode, reference signal, mapping mode, etc. of the downlink physical channel of the first interface.
  • the first instruction information and the second instruction information are specifically introduced.
  • the first indication information and the second indication information may include reference information, and the reference information is information corresponding to different interfaces, for example, a synchronization channel base sequence set, a period of a synchronization signal, and a time-frequency position of the synchronization signal , The offset of the synchronization signal in a fixed time period or the PBCH time-frequency position, etc.; or, the first indication information and the second indication information may also include explicit indication information or implicit indication information, the explicit indication information For example, the interface used by the relay device or the user equipment may be directly indicated in the first indication information.
  • the base sequence set corresponding to different interfaces, the period of the synchronization signal, the time-frequency position of the synchronization signal, the offset of the synchronization signal in a fixed time period or the PBCH time-frequency position are different.
  • description is made when the first interface is a Uu interface.
  • the base sequence used when generating the secondary synchronization signal can come from different base sequence sets. Since the base sequence sets of different interfaces include different base sequences, the user equipment can generate the SSS based on the base sequence. Sequence to determine the type of wireless interface to be used corresponding to the SSS, thereby determining the wireless interface used.
  • formula (1) to formula (4) are SSS generation formulas for the first interface:
  • Formula (5) to Formula (8) are the SSS generating formulas of the second interface:
  • SSS 1 (n) is SSS 1 is the first ZC sequence used to compose the SSS base sequence.
  • SSS 2 (n) is: SSS1 is the second ZC sequence used to form the SSS base sequence.
  • u 1 and u 2 are: parameters used to determine the base sequence.
  • the synchronization signal base sequence combination of the first interface and the second interface is different, and the user equipment or the second relay device can learn the wireless interface to be used according to the blind detection of the synchronization signal.
  • the first indication information and the second indication information may also be broadcast messages, system messages, or unlimited resource control (radio resource control, RRC) messages.
  • RRC radio resource control
  • the first relay device or the base station may carry indication information in the RRC message to indicate the user equipment or the second relay device used interface.
  • the RRC message may be, for example, one or more of an RRC connection establishment message, an RRC reestablishment message, an RRC reply message, or an RRC reconfiguration message.
  • the indication information included in the first indication information and the second indication information may be implicit indications, for example, the indication information indicates the hop count of the first relay device or the first device, and the first device determines according to the hop count Whether it is the first hop node, if it is, the first interface can be used; if it is not the first hop node, the second interface can be used.
  • the protocol or system may specify the counting principle of the number of hops where the relay device is located in the multi-hop system. For example, the protocol or system may specify that the base station is the 0th hop, the first-level relay node that accesses the base station is the first hop, and the number of hops of the relay nodes of each subsequent level is increased by one in turn.
  • the protocol or system may also specify that the first-level relay device that accesses the base station is the 0th hop, and the number of hops of each subsequent level of the relay device is sequentially increased by 1.
  • the indication information included in the first indication information and the second indication information may also be a display indication, for example, an interface type indication.
  • the first relay device may According to the first indication information or other relay devices or user equipment, the used interface may be determined according to the above information included in the second indication information.
  • the relay device or the user equipment may learn the type of the corresponding wireless interface according to the reference message. For example, when the reference information is a synchronization channel base sequence set, the relay device or the user equipment can obtain the base sequence set from which wireless interface base sequence set is selected according to the base sequence constituting the synchronization channel, thereby determining the use The type of wireless interface.
  • the reference information is a synchronization channel base sequence set
  • the relay device or the user equipment can obtain the base sequence set from which wireless interface base sequence set is selected according to the base sequence constituting the synchronization channel, thereby determining the use The type of wireless interface.
  • the base sequence of the synchronization signal can be used to determine which interface the base sequence set belongs to, and then determine to use the interface; or The device or user equipment can determine the type of wireless interface used according to the time-frequency position of the PBCH.
  • the relay device and the user equipment respectively determine the interface to be used according to the instruction information carried in the first instruction information and the second instruction information, and the instruction information may be explicit instruction information or implicit instruction information.
  • the relay device or user equipment may determine the interface to be used according to the instruction information carried in the received broadcast message or system message; or, the relay device or user equipment may determine the interface to be used according to the instruction information in the received RRC message. Interface.
  • the relay device or the user equipment may also determine the interface to be used according to the hop count information sent by the superior node. For example, when the relay device or user equipment determines that it is the first hop node according to the broadcast message or system message of the superior node, it determines to use the first interface; when the relay device or user equipment determines that it is not the first hop node, it determines to use the first interface. Two interface.
  • the upper-level node notifies the lower-level node of the wireless interface used, so that the lower-level node can effectively complete the transmission in the multi-hop network, and at the same time effectively save the public resource overhead of the multi-hop network.
  • This embodiment uses different interfaces for data transmission between different network element nodes in a multi-hop network, so that the first relay device can reuse the receiving process of the parent link and the child link, minimize the complexity of the receiving module, and reduce Equipment cost.
  • the first interface or the second interface is used for data transmission between the relay device and the relay device and between the relay device and the user equipment, and the first interface and the second interface are set so that the user equipment can reproduce data. Using the receiving process of the first interface and the second interface reduces the complexity of processing data and the cost of equipment.
  • the base station and the first relay device When the base station and the first relay device perform data transmission through the first interface, and the first relay device and the second relay device or the user equipment perform data transmission through the second interface, for the first relay device, Its connection to the parent link (the transmission link between the base station and the first relay device) and the child link (the transmission link between the first relay device and the second relay device or the first relay device and the user equipment)
  • the transmission or reception time of needs to be aligned to minimize cross interference and extend the length of the guard interval to ensure the normal transmission and reception conversion of the filter tail. This effect requires a timing advance parameter T A is achieved by adjusting the first relay device.
  • Figure 7 shows a schematic diagram of timing advance.
  • the time for the base station to receive the uplink information sent by the first relay device is delayed.
  • the sub-link between the first relay device and the second relay device or the first relay device and the user equipment also has a transmission delay.
  • the sending or receiving time on the parent link and the child link of the first relay device needs to be aligned.
  • the time of the downlink information sent by the first relay device to the second relay device or the user equipment and the first relay device The time for sending uplink information to the base station needs to be aligned; or, the time when the first relay device receives the uplink information sent by the second relay device or the user equipment and the time when the first relay device receives the downlink information sent by the base station need to be aligned.
  • the frame structure of the wireless frame of the first interface is shown in Figure 6(a), and the frame structure of the wireless frame of the second interface is shown in Figure 6(b).
  • the timing advance parameter between the first relay device and the base station By adjusting the timing advance parameter between the first relay device and the base station, the time of the uplink information sent by the first relay device to the base station can be aligned.
  • the timing advance scheme of the first interface is:
  • T [(N TA +N TA-offset ) ⁇ Ts]s
  • T is the time advance required for transmission through the first interface
  • N TA-offset is the time advance set based on the guard slot GAP in the wireless frame
  • the radio frame of the first interface is the radio frame of the first interface shown in FIG. 3, in order to ensure that there is a necessary guard interval when switching between uplink transmission and downlink transmission, the uplink transmission subframe UL Advance 20Ts (the duration of GAP is 40Ts), so that there is a guard interval of 20Ts between UL and DL of the next TTI.
  • N TA-offset of the first interface 20Ts.
  • the second interface The time length of the GAP used to adjust the time advance in the wireless frame can be flexibly set according to the required time advance. For example, when setting the protection timeslot GAP of the second interface, both the timing advance in the parent link of the first relay device and the timing advance of the child link need to be considered. In other words, the second interface The setting of the guard time slot GAP in the frame structure of, can meet the sum of the time advance required by the parent link and the child link.
  • the GAP time length between the downlink subframe and the uplink subframe in the radio frame of the second interface is set according to the time advance in the parent link and the time advance in the child link. Specifically, when the preset guard interval between adjacent radio frames of the first interface is T, the second interface presets a time advance of N TA-offset so that the interval between adjacent radio frames of the second interface Also T.
  • N TA-offset can take a different value.
  • the i-th hop relay node should satisfy the following relationship:
  • N TA,i-1 is the time advance of the i-1th hop relay device for the time delay caused by the transmission distance
  • N TA, i is the time advance of the i-1th hop relay device for the time delay caused by the transmission distance
  • T RTT, i is the signal round-trip time between the i-th hop device and its parent node
  • N TA,i cannot be a negative value
  • N TA-offset cannot reuse the value of the first interface
  • Fig. 8 shows a schematic structural diagram of the communication device provided by the present application.
  • the communication device shown in FIG. 8 may be the relay device mentioned above.
  • the communication device 800 can be used to implement the above steps performed by the relay device.
  • the communication device 800 includes a receiving unit 810 and a sending unit 820.
  • the receiving unit 810 is configured to receive a first indication message sent by a second device at a first device (that is, a relay device), where the first indication message is used to instruct the first device to communicate with the first device through the first interface or the second interface.
  • the second device performs data transmission, where when the second device is a base station, the first indication message instructs the first device to perform data transmission with the second device through the first interface.
  • the sending unit 820 is configured to send a second indication message to a third device, where the second indication message is used to instruct the third device to perform data transmission with the first device through the first interface or the second interface, where At least one uplink physical channel of the second interface and at least one downlink physical channel of the first interface use the same modulation mode, and the uplink physical channel and the downlink physical channel of the first interface use different modulation modes.
  • B corresponding to A means that B is associated with A, and B can be determined according to A.
  • determining B according to A does not mean that B is determined only according to A, and B can also be determined according to A and/or other information.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

本申请提供了一种数据传输的方法及通信装置。该方法包括：中继设备与基站通过第一接口进行数据传输，中继设备与其他中继设备或者中继设备与用户设备通过第二接口进行数据传输，其中，所述第二接口的至少一条上行物理信道与所述第一接口至少一条下行物理信道采用相同的调制方式，所述第一接口的上行物理信道和下行物理信道采用不同的调制方式。上述技术方案解决了由于中继设备父链路和子链路的物理信道采用不同的调制方式，使得中继设备无法复用接受流程导致的设备复杂度过高的问题，在保证数据正常传输的同时，降低设备复杂度和成本。

Description

数据传输的方法及通信设备 技术领域
本申请涉及通信领域，并且更具体地，涉及一种数据传输的方法及通信设备。
背景技术
随着无线通信系统的发展，未来的移动通信将是一个无所不在的无线通信系统，提供无缝、不同服务质量(quality of service，QoS)、高速率的无线多媒体业务，但高速传输与覆盖的矛盾是未来通信中亟待解决的问题。近年来发展的无线多跳技术(wireless multi-hop networks，WMN)是针对这个问题比较理想的解决方案之一。
无线多跳技术不是传统意义上基站与用户设备之间之间进行通信，而是借助于一个或多个中继设备实现基站与用户设备之间的非直连通信，其中，中继设备的主要特点是可以将传统意义上的直接传输路径分成多个短小的路径来传递信息。在长期演进(long term evolution，LTE)型通信系统中，在基站与中继设备之间通常采用移动通信系统地面接入网和用户设备(UMTS terrestrial radio access network anduser equipment，Uu)接口进行数据传输，在中继设备与用户设备或者其他中继设备之间通常采用PC5(ProSe Control 5)接口进行数据传输。因此，对于中继设备来说，需要能够同时处理与上级节点进行通信的数据和与下级节点之间的进行通信的数据，这就对中继设备的处理能力提出了更高的要求。
如何在多跳网络中保证进行正常的数据传输的同时，降低设备处理数据的复杂度以及设备成本成为亟待解决的问题。
发明内容
本申请提供一种数据传输的方法、中继设备以及用户设备，能够实现多跳网络中保证正常的数据传输的同时，降低设备处理数据的复杂度以及设备成本。
第一方面，提供了一种数据传输的方法，包括：第一设备接收第二设备送的第一指示消息，所述第一指示消息用于指示所述第一设备通过第一接口或者第二接口与所述第二设备进行数据传输，其中，当所述第二设备为基站时，所述第一指示消息指示所述第一设备通过所述第一接口与所述第二设备进行数据传输；所述第一设备向第三设备发送第二指示消息，所述第二指示消息用于指示所述第三设备通过所述第一接口或者第二接口与所述第一设备进行数据传输，其中，所述第二接口的至少一条上行物理信道与所述第一接口至少一条下行物理信道采用相同的调制方式，所述第一接口的上行物理信道和下行物理信道采用不同的调制方式。
根据本申请实施例的数据传输方法，第一设备和第二设备与第一设备与第三设备之间可以灵活选择接口进行数据传输，使第一设备可以实现父链路和子链路上的接收流程复用，降低设备复杂度和成本。
结合第一方面，在第一方面的某些实现方式中，所述第二接口的上行物理共享信道和 所述第一接口的下行物理共享信道采用相同的编码方式；和/或所述第二接口的承载控制信息的上行物理信道和所述第一接口的承载控制信息的下行物理信道采用相同的编码方式。
根据本申请实施例的数据传输方法，能够使第一设备实现编译码流程的复用，此外，第一接口的上下行物理信道采用不同的编码方式，可以使数据编码的方式与第一设备和第二设备的译码能力相适应。
结合第一方面，在第一方面的某些实现方式中，所述第二接口的上行物理共享信道与所述第二接口的下行物理共享信道采用相同的编码方式；和/或所述第二接口的承载控制信息的上行物理信道和所述第二接口的承载控制信息的下行物理信道采用相同的编码方式。
结合第一方面，在第一方面的某些实现方式中，所述第一接口的用于下行传输的物理资源和所述第二接口的用于下行的物理资源相同；和/或所述第二接口的用于上行传输的物理资源和所述第二接口的用于下行的物理资源相同。
结合第一方面，在第一方面的某些实现方式中，所述物理资源包括：时域资源和/或频域资源。
结合第一方面，在第一方面的某些实现方式中，所述时域资源包括：每传输时间间隔TTI中用于传输的时间和所述每TTI中的符号数量和所述每TTI中的符号时间长度。
结合第一方面，在第一方面的某些实现方式中，符号时间长度包括所述符号的循环前缀CP时间长度。
结合第一方面，在第一方面的某些实现方式中，所述频域资源包括：资源块的子载波个数和所述资源块特定位置的子载波的带宽，其中，所述资源块包括载波或者物理资源块。
结合第一方面，在第一方面的某些实现方式中，所述第一指示消息或者第二指示消息包括以下至少一种：同步信道基序列、同步信号的周期、同步信号在一个固定时间周期内的偏移量、物理广播信道PBCH时频位置、广播消息、系统消息或者无线资源控制RRC消息。
结合第一方面，在第一方面的某些实现方式中，所述第一接口的至少一个下行参考信号与所述第二接口的上行参考信号采用相同的基序列和/或资源块RE映射方式。
结合第一方面，在第一方面的某些实现方式中，所述第二接口的至少一条上行物理信道和下行物理信道与所述第一接口的下行物理信道采用相同的阶数映射表格和/或传输块大小TBS表格。
结合第一方面，在第一方面的某些实现方式中，所述第一接口和所述第二接口采用不同的时间提前偏移量N TA-offset。
结合第一方面，在第一方面的某些实现方式中，当所述第一接口的相邻无线帧之间的预设间隔为T时，所述第二接口采用时间提前偏移量N TA-offset使所述第二接口的相邻无线帧之间的预设间隔也为T。
第二方面，提供了一种通信设备，包括：接收单元，用于接收第二设备送的第一指示消息，所述第一指示消息用于指示第一设备通过第一接口或者第二接口与所述第二设备进行数据传输，其中，当所述第二设备为基站时，所述第一指示消息指示所述第一设备通过所述第一接口与所述第二设备进行数据传输；发送单元，用于向第三设备发送第二指示消 息，所述第二指示消息用于指示所述第三设备通过所述第一接口或者第二接口与所述第一设备进行数据传输，其中，所述第二接口的至少一条上行物理信道与所述第一接口至少一条下行物理信道采用相同的调制方式，所述第一接口的上行物理信道和下行物理信道采用不同的调制方式。
结合第二方面，在第二方面的某些实现方式中，所述第二接口的上行物理共享信道和所述第一接口的下行物理共享信道采用相同的编码方式；和/或所述第二接口的承载控制信息的上行物理信道和所述第一接口的承载控制信息的下行物理信道采用相同的编码方式。
结合第二方面，在第二方面的某些实现方式中，所述第二接口的上行物理共享信道与所述第二接口的下行物理共享信道采用相同的编码方式；和/或所述第二接口的承载控制信息的上行物理信道和所述第二接口的承载控制信息的下行物理信道采用相同的编码方式。
结合第二方面，在第二方面的某些实现方式中，所述第一接口的用于下行传输的物理资源和所述第二接口的用于下行的物理资源相同；和/或所述第二接口的用于上行传输的物理资源和所述第二接口的用于下行的物理资源相同。
结合第二方面，在第二方面的某些实现方式中，所述物理资源包括：时域资源和/或频域资源。
结合第二方面，在第二方面的某些实现方式中，所述时域资源包括：每传输时间间隔TTI中用于传输的时间和所述每TTI中的符号数量和所述每TTI中的符号时间长度。
结合第二方面，在第二方面的某些实现方式中，符号时间长度包括所述符号的循环前缀CP时间长度。
结合第二方面，在第二方面的某些实现方式中，所述频域资源包括：资源块的子载波个数和所述资源块特定位置的子载波的带宽，其中，所述资源块包括载波或者物理资源块。
结合第二方面，在第二方面的某些实现方式中，所述第一指示消息或者第二指示消息包括以下至少一种：同步信道基序列、同步信号的周期、同步信号在一个固定时间周期内的偏移量、物理广播信道PBCH时频位置、广播消息、系统消息或者无线资源控制RRC消息。
结合第二方面，在第二方面的某些实现方式中，所述第一接口的至少一个下行参考信号与所述第二接口的上行参考信号采用相同的基序列和/或资源块RE映射方式。
结合二方面，在第二方面的某些实现方式中，所述第二接口的至少一条上行物理信道和下行物理信道与所述第一接口的下行物理信道采用相同的阶数映射表格和/或传输块大小TBS表格。
结合第二方面，在第二方面的某些实现方式中，所述第一接口和所述第二接口采用不同的时间提前偏移量N TA-offset。
结合第二方面，在第二方面的某些实现方式中，当所述第一接口的相邻无线帧之间的预设间隔为T时，所述第二接口采用时间提前偏移量N TA-offset使所述第二接口的相邻无线帧之间的预设间隔也为T。
附图说明
图1是本申请实施例提供的多跳网络系统的示意图。
图2是本申请实施例提供的一种数据传输的方法的示意性流程图。
图3是本申请实施例提供的不同接口采用的时域资源示意图。
图4是本申请实施例提供的不同接口的帧结构示意图。
图5是本申请实施例提供的时间对齐的示意图。
图6是本申请实施例涉及的一种参考信号映射方式的示意图。
图7是本申请实施例涉及的另一种参考信号的映射方式的示意图。
图8是本申请实施例提供的通信装置的示意性结构图。
具体实施方式
下面将结合附图，对本申请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申请的一部分实施例，而不是全部实施例。基于本申请中的实施例，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，都应属于本申请保护的范围
应理解，本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(global system of mobile communication，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进系统、频分双工(frequency division duplex，LTE FDD)系统、时分双工(Time Division Duplex，LTE TDD)系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统以及未来的第五代(5th generation，5G)系统或新无线(new radio，NR)等，本申请实施例对此并不限定。本实施例提供的方法还可以应用于通信系统，例如车载通信技术(vehicle to everything，V2X)、基于长期演进的车载通信技术(long term evolution vechicle，LTE-V)、车辆对车辆(vechicle to vechicle，V2V)通信系统、人工半自动收费车道(manual toll collection system，MTC)、物联网(internet of things，IoT)、LTE机器对机器(LTE-machine to machine，LTE-M)，机器对机器(machine to machine，M2M)等。
本申请实施例中的用户设备(user equipment，UE)可以指终端设备、接入终端、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。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等，本申请实施例对此并不限定。
在本申请实施例中，基站可以是GSM或CDMA中的基站(base transceiver station，BTS)，也可以是WCDMA中的基站(NodeB，NB)，还可以是LTE中的演进型基站(Evolutional Node B，eNodeB)，5G中的基站gNB，或者是具有基站功能的其他网络设备，本申请对此并不限定。
在本申请实施例中，用户设备、中继设备或网络设备包括硬件层、运行在硬件层之上的操作系统层，以及运行在操作系统层上的应用层。该硬件层包括中央处理器(central processing unit，CPU)、内存管理单元(memory management unit，MMU)和内存(也称为主存)等硬件。该操作系统可以是任意一种或多种通过进程(process)实现业务处理的计算机操作系统，例如，Linux操作系统、Unix操作系统、Android操作系统、iOS操作系统或windows操作系统等。该应用层包含浏览器、通讯录、文字处理软件、即时通信软件等应用。并且，本申请实施例并未对本申请实施例提供的方法的执行主体的具体结构特别限定，只要能够通过运行记录有本申请实施例的提供的方法的代码的程序，以根据本申请实施例提供的方法进行通信即可，例如，本申请实施例提供的方法的执行主体可以是终端设备或网络设备，或者，是终端设备或网络设备中能够调用程序并执行程序的功能模块。
图1为可应用于本申请实施例的无线多跳网络的场景示意图。
图1所示的D2D无线多跳网络系统100由基站101、中继设备102、103以及用户设备104组成，其中，基站101为向用户设备103提供服务的基站，中继设备可以处于不同的跳数，在本申请中，将上级节点为基站的中继设备称为第一跳中继设备(如中继设备102)，将上级节点为其他中继设备的中继设备称为非第一跳中继设备(如中继设备103)可以是上级节点为基站的中继设备(如中继设备102)。
应理解，图1仅为说明多跳网络及组成多跳网络的各个设备的示意图，并不对本申请的实施例构成限定，例如，图1中的基站、中继设备和用户设备的数量对本申请无任何限定。此外，本申请中的跳数仅为说明方便，并无限定作用，例如，上级节点为基站的中继设备也可以成为第0跳中继设备或者第二跳中继设备等。
以图1中的D2D多跳网络结合LTE通信系统为例，中继设备与基站之间可以通过Uu接口进行通信，中继设备与用户设备或者中继设备与其他中继设备之间可以通过PC5接口进行侧行链路通信，例如，中继设备102与基站之间采用Uu接口通信，中继设备102与用户设备104之间采用PC5接口进行通信。
当中继设备与基站通过Uu接口进行通信时，以数据信道为例，该Uu接口的上行物理信道和下行物理信道采用的信道编码方式均为turbo编码，上行物理信道的调制方式为单载波频分多址(single-carrier frequency-division multiple，SC-FDM)波形调制，下行物理信道的调制方式为正交频分复用(orthogonal frequency division multiplexing，OFDM)波形调制。当中继设备与用户设备或者其他中继设备通过PC5接口进行通信时，PC5接口的上行物理信道与下行物理信道均采用turbo编码方式进行编码，且均采用SC-FDM波形调制。
应理解，Uu接口的下行物理信道和PC5接口的用于侧行通信的物理信道均采用turbo编码，因此，需要接入网络的用户设备具备turbo译码能力，从而增加了用户设备的复杂度和成本，不适合电力抄表业务。此外，Uu接口的下行物理信道与PC5接口的用于侧行通信的物理信道使用不同的调制波形、参考信号、映射资源等，因此，使得第一中继设备无法复用接收流程，增加第一中继设备处理数据的复杂度以及第一中继设备成本。
针对上述存在的问题，本申请实施例提供一种数据传输的方法。
图2示出了本申请实施例的一种数据传输方法的示意性流程图。
S201，第一设备接收第二设备发送的第一指示信息。
可选地，该第一设备是中继设备，该第二设备为第一设备的父节点，第二设备可以是基站也可以是其他中继设备。
可选地，当第二设备为基站时，第一指示信息用于指示第一设备通过第一接口与第二设备进行数据传输。
可选地，当第二设备为其他中继设备时，第一指示信息用于指示第一设备通过第一接口或者第二接口与该第二设备进行数据传输。
具体地，当该中继设备的父节点为基站时，基站向第一设备发送的第一指示信息指示第一设备通过第一接口与该基站进行数据传输；当该中继设备的父节点为其他中继设备时，该第一指示信息指示第一中继设备通过第一接口或者第二接口与该父节点进行数据传输。换句话说，第一中继设备与基站之间可以通过第一接口进行数据传输，而中继设备与中继设备之间或者中继设备与用户设备之间可以通过第一接口或者第二接口进行数据传输。
S202，第一设备向第三设备发送第二指示信息。
可选地，该第一设备为中继设备，第三设备可以是第一设备的子节点，例如可以是至少一个其他的中继设备或者用户设备。
可选地，第一设备向该第三设备发送第二指示信息，该第二指示信息用于向该第三设备指示通过第一接口或者第二接口与该第一设备进行数据传输。换句话说，第一设备与该第一设备的下级节点之间可以通过第一接口或者第二接口进行数据传输。
应理解，在本申请实施例的无线通信过程中，为适应中继设备的处理能力，中继设备的父链路和子链路可以灵活选择接口类型进行数据传输，例如，中继设备与基站之间可以通过第一接口进行通信，中继设备与其他中继设备或中继设备与用户设备之间可以通过第一接口或者第二接口进行通信。同时，本申请实施例对第一接口和第二接口进行设置，使得第二接口的至少一条上行物理信道和第一接口的下行物理信道具有相同的调制方式，从而使中继设备可以复用父链路和子链路的接收流程，降低中继设备复杂度以及成本。
还应理解，一般来说，基站与中继设备或者用户设备的处理能力不同，基站具有较强的处理能力，而中继设备或者用户设备具有的处理能力可能相对较弱。因此，对于基站和中继设备或者基站和用户设备通过第一接口进行通信时，该第一接口可以满足：上行物理信道和下行物理信道采用不同的调制方式，也即，第一接口的上下行物理信道中不存在调制方式相同的一对上下行物理信道。
综上，在本申请实施例中，第一接口的下行物理信道和第二接口的上行物理信道采用相同的调制方式，第一接口的上下行物理信道采用不同的调制方式。
示例性的，第一接口的下行物理信道和第二接口的上行物理信道采用相同的调制方式，其中，该第一接口的下行物理信道可以是承载控制信息的下行物理信道，例如可以是物理下行控制信道(physical downlink control channel，PDCCH)或者物理混合自动重传指示信道(physical hybrid ARQ channel，PHICH)，或者窄带物联网(narrow band internet of things，NB-IoT)系统中的下行控制信道(narrow physical downlink control channel，NPDCCH)；该第二接口的上行物理信道可以是承载控制信息的上行物理信道，例如可以是上行物理控制信道(physical uplink control channel，PUCCH)或者NB-IoT系统中的上行物理控制信道(narrow physical uplink control channel，NPUCCH)或者本申请第二接口 涉及的上行物理控制信道(IAB physical uplink control channel，IPUCCH)；或者，该第一接口的下行物理信道和第二接口的上行物理信道可以分别是下行物理共享信道(physical downlink shared channel，PDSCH)和上行物理共享信道(physical uplink shared channel，PUSCH)。上述方案涉及的上行物理信道和下行物理信道还可以包括其他多种，本申请对此并不限定。
示例性的，第一接口的上下行物理信道采用不同的调试方式，例如，第一接口的上行物理信道可以采用SC-FDM波形调制，下行信道采用OFDM波形调制。其中，第一接口的上行物理信道和下行物理信道可以是：第一接口的PUSCH和PDSCH或者第一接口的PUCCH和PDCCH等。此外，第一接口的下行物理信道也可以是PHICH。
可选地，第二接口的上行控制信道和第一接口的下行控制信道可以采用相同的编码方式；其中，第二接口的下行控制信道也可以是PHICH，也即第二接口的PUCCH与第一接口的PHICH采用相同的编码方式。
可选地，第一接口的上下行物理共享信道分别采用不同的编码方式；或者，第一接口的上下行物理控制信道分别采用不同的编码方式。例如，第一接口的上行共享物理信道采用turbo编码，而下行共享物理信道可以采用咬尾卷积编码。
可选地，第二接口的用于上行传输的物理资源和第一接口的用于下行传输的物理资源相同，该物理资源可以是时域资源和/或频域资源。
可选地，第一接口的用于上下行传输的物理资源不相同，该物理资源可以是时域资源和/或频域资源。
可选地，第二接口的至少一条上行物理信道和下行物理信道与第一接口的下行物理信道采用相同的阶数映射表格和/或传输尺寸(transmission block size，TBS)表格。
可选地，第一接口的下行参考信号与第二接口的上行参考信号采用相同的基序列和/或资源块(resource element，RE)映射方式。
应理解，第二接口的上下行物理信道可以采用相同的调制方式和/或编码方式，或者，第二接口的用于上下行传输的物理资源相同，也即，第二接口的上下行物理信道的调制方式与第一接口的下行物理信道的调制方式相同；和/或，第二接口的上下行物理信道的编码方式与第一接口的下行物理信道的编码方式相同；和/或，第二接口的用于上下行传输的物理资源与第一接口的用于下行传输的物理资源均相同。其中，第二接口的上下行物理信道可以是PUSCH和PDSCH，第一接口的下行物理信道可以是PDSCH；或者，第二接口的上下行物理信道可以是PUCCH和PDCCH，第一接口的下行物理信道可以是PDCCH或者PHICH。
下面对本申请第一接口和第二接口可采用的调制方式、编码方式以及参考信号等进行介绍。
作为一个示例，当第一接口为Uu接口时，该第一接口的上行物理信道可以包括：PUCCH、PUSCH；该第一接口的下行物理信道可以包括：PDCCH、PDSCH、物理广播信道(physical broadcast channel，PBCH)、PHICH。其中，该第一接口的不同的上行物理信道或者下行物理信道采用的信道编码方式、调制方式、参考信号分别如表1所示。其中，PDCCH、PDSCH、PBCH的编码方式均为咬尾卷积编码，调制方式为OFDM波形调制，参考信号为小区参考信号(cell reference signal，CRS)；PUCCH采用重复编码方式，SC-FDM 波形调制，以及解调参考信号(demodulation reference signal，DMRS)的映射方式；PUSCH采用Turbo编码方式，SC-FDM波形调制以及DMRS的映射方式。各个物理信道采用的编码方式、调制波形以及参考信号如表1所示。
表1
Figure PCTCN2019080848-appb-000001
应理解，CRS和DMRS的映射方式不同。由Uu接口的上行物理信道和物理下行信道的调制方式、编码方式和参考信号可以看出，对于Uu接口的每条上行物理信道，均不存在Uu接口的下行物理信道，使得两者满足编码方式、调制方式和资源映射一致。
可选地，为满足第二接口的上行传输资源与第一接口的下行传输资源相同，可以对第二接口的物理信道进行设计。第二接口的不同物理信道采用的信道编码方式、调制方式、参考信号如表2所示。
表2
Figure PCTCN2019080848-appb-000002
应理解，表2中的上行共享信道(IBA physical uplink shared channel，IPUSCH)与PUSCH的实质功能相同，仅为了便于区别本申请实施例中设计的接口的上行共享信道。同样地，上行控制信道(IBA physical uplink shared channel，IPUSCH)与PUCCH的实质功能相同，仅为了便于区别本申请实施例中设计的接口的上行控制信道。
由表1和表2可见，第一接口的PHICH与第二接口的IPUCCH均采用RM编码方式、OFDM波形调制以及参考信号均为CRS，因此，第一接口的PHICH与第二接口的IPUCCH具有相同的编码方式、调制方式和参考信号。此外，第二接口的IPUSCH与第一接口和第二接口的PDSCH均采用咬尾卷积编码、OFDM波形和CRS参考信号，因此，第一接口的PDSCH与第二接口的PDSCH具有相同的编码方式、调制方式和参考信号。换句话说，第一接口至少一条下行物理信道与第二接口的上行物理信道采用相同的编码方式、调制方式和参考信号。
可选地，第一接口的至少一个下行参考信号与第二接口的上行参考信号、下行参考信号采用相同的基序列和RE映射方式。具体地，第一接口的参考信号CRS与第二接口的参 考信号中继节点特定参考信号(IAB-node-specific reference signal，IRS)和第二接口的解调参考信号(integrated access and backhaul demodulation reference signal，IDMRS)在天线端口数相同的情况下，采用相同的RE映射方式。其中，IDMRS与DMRS实质功能相同，仅为了便于区别本申请实施例中设计的接口的解调参考信号。其中，CRS、IRS或者IDMRS单天线端口的映射方式可以如图3所示。此外，第一接口的用于上行传输的解调参考信号(demodulation reference signal，DMRS)映射方式如图4所示。可以看出，第一接口的用于上行传输和用于下行传输的参考信号使用的RE映射方式不同。
可选地，第二接口的上行传输可以仅支持单天线端口。
可选地，第一接口的下行物理信道和第二接口的上行物理信道与下行物理信道采用相同的调制编码方案(modulation&coding scheme)结束映射表格。其中，第一接口的下行物理信道可以是PDSCH也可以为其他下行物理信道，第二接口的上行物理信道和下行物理信道可以分别为IPUSCH、IPDSCH，也可以为其他对应的物理信道，本申请对此不做限定。
可选地，第一接口的下行参考信号与第二接口的上行参考信号和下行参考信号采用相同的基序列。例如，参考信号CRS、IRS、IDMRS的基序列均为公式1：
Figure PCTCN2019080848-appb-000003
其中，r l,ns为：l为一个时隙内的符号编号，n s为时隙编号，r l,ns为在一帧中映射于对应时隙对应OFDM符号上的基序列取值。
m为传输参考信号载波的绝对武力载波索引；
c为伪随机序列。
此外，DMRS基序列为公式2：
Figure PCTCN2019080848-appb-000004
其中，
Figure PCTCN2019080848-appb-000005
为子载波数；
u为高层参数配置；
α为一相位旋转值。
可选地，IPUSCH可以和PDSCH采用相同的TBS表格、扰码种子生成公式；或者，IPUCCH和PHICH采用相同的调制方式、TBS表格、扰码种子生成公式；或者，第一接口任一下行物理信道与第二接口上行物理信道具有相同的CRS序列公式或者扰码种子生成公式相同。
应理解，当第一接口的下行物理信道采用一种波形调制方式时，第二接口的上行物理信道也采用与之相同的调制方式，从而使得第一中继设备可以复用接收流程，提高数据传输的效率。且第一接口的上下行物理信道可以采用不同的调制方式，以分别适应基站和中继设备的处理能力。此外，该第二接口的上下行物理信道也可以采用相同的调制方式，例如，第二接口的上行物理信道和下行物理信道均采用OFDM波形调制。
此外，第二接口的上行物理信道与下行物理信道可以均和第一接口的下行物理信道采用相同编码方式、调制方式、参考信号或者其他映射资源等。例如，第二接口的上行物理 信道与该第二接口的下行物理信道均采用咬尾卷积编码方式；或者，第二接口的上行物理信道与第二接口的下行物理信道均采用OFDM波形调制等。
应理解，第二接口的用于上行传输的资源和第一接口的用于下行传输的资源相同可以是第二接口的上行时域资源和第一接口的下行时域资源相同，也可以是第二接口的上行频域资源和第一接口的下行频域资源相同，或者两者均相同。
其中，第二接口的上行传输和下行传输与第一接口的下行传输相同的具体描述与上文中第二接口的上行传输与第一接口的下行传输相同类似，具体描述可以参见上文，为避免重复，此处不再赘述。
下面将结合图5和图6对上文提到的时域资源相同、频域资源相同进行具体介绍。
可选地，第二接口的上行时域资源与第一接口的下行时域资源相同可以包括：第二接口的每传输时间间隔TTI中用于上行传输的时间与第一接口的每TTI中用于下行传输的时间相同，且第二接口的每TTI中的上行符号与第一接口的每TTI中的下行符号的数量相同，且该第二接口的每TTI中的该上行符号与第一接口的每TTI中的对应位置的下行符号时间长度相同。
作为一个示例，结合图5和图6对第二接口的每传输时间间隔TTI中用于上行传输的时间与第一接口的每TTI中用于下行传输的时间相同进行具体介绍。图5为多跳网络中时频资源传输的示意图。其中，基站与第一中继设备进行数据传输所使用的第一接口的无线帧(下称第一无线帧)与第一中继设备与第一设备进行数据传输所使用的第二接口的无线帧(下称第二无线帧)的帧结构不同，其中，本实施例中的第一无线帧和第二无线帧的结构分别如图6(a)和图6(b)所示。
图6(a)示出了第一无线帧的帧结构。在图6(a)中，第一接口的每个长度为10毫秒(ms)的无线帧包括5个长度为2ms的子帧，其中时隙(slot)#0、slot#1被分配用于下行链路(downlink，DL)传输，slot#3、slot#4被分配用于上行链路(uplink，UL)传输，在下行传输时隙和上行传输时隙之间为特殊时隙slot#2，其中，特殊时隙的结构包括下行导频时隙(DwPTS)，上行与下行之间的保护时隙GAP以及上行导频时隙(UpPTS)。
图6(b)示出了第二无线帧的帧结构。为描述简洁，仅针对第二接口的无线帧与第一接口的无线帧的区别进行介绍。与第一无线帧的用于上行传输的slot#4不同，第二接口的用于上行链路传输的slot#4被划分为时间长度T UL＝60T s＝4/3ms的UpPTS和时间长度T GAP＝40T s＝2/3ms的GAP。
可以看出，第一无线帧中，时隙slot#0和slot#1用于下行传输，slot#0和slot#1的时间长度为240Ts，特殊时隙slot中包括下行导频时隙的时间长度为20Ts，因此可以获知第一接口的一个TTI中用于上行传输的时间长度为240Ts+20Ts＝260Ts。在第二无线帧中，时隙slot#3和slot#4用于上行传输，其中，slot#3和slot#4中用于上行传输的时间长度为240Ts-40Ts＝200Ts，此外，特殊时隙中上行导频时隙的时间长度为60Ts，第二接口的一个TTI中用于上行传输的时间长度为200Ts+60Ts＝260Ts。因此，第一接口的一个TTI中用于下行传输的时间和第二接口的一个TTI中用于上行传输的时间相同。
可选地，第二接口的上行时域资源与第一接口的下行时域资源相同还可以包括：第二接口的每TTI中的上行符号与第一接口的每TTI中的对应位置的下行符号具有相同的循环前缀(cyclic prefix，CP)时间长度。
可选地，第二接口的上行频域资源与第一接口的下行频域资源相同可以包括以下至少一种：第二接口的上行资源块与第一接口的下行资源块的子载波个数相同，且上行资源块的子载波和下行资源块对应位置的子载波的带宽相同。其中，该资源块可以是载波或者物理资源块。
此外，第二接口的至少一条上行物理信道与第一接口的下行物理信道的编码方式、调制方式、参考信号、映射方式等中的一种或多种相同。
接下来，对第一指示信息和第二指示信息进行具体介绍。
可选地，第一指示信息和第二指示信息可以包括参考信息，该参考信息为与不同接口具有对应关系的信息，例如，同步信道基序列集合、同步信号的周期、同步信号的时频位置、同步信号在一个固定时间周期内的偏移量或者PBCH时频位置等；或者，该第一指示信息和第二指示信息还可以包括明式指示信息或者隐式指示信息，该明式指示信息例如可以在第一指示信息中直接指示中继设备或者用户设备使用的接口。
应理解，不同接口对应的基序列集合、同步信号的周期、同步信号的时频位置、同步信号在一个固定时间周期内的偏移量或者PBCH时频位置不同。为便于理解，以第一接口为Uu接口时进行说明。
辅同步信号(secondary synchronization signal，SSS)生成时所采用的基序列可以来自不同的基序列集合，由于不同接口的基序列集合包括的各个基序列不相同，因此，用户设备可以根据生成SSS的基序列来判断该SSS对应要使用的无线接口类型，从而确定使用的无线接口。
作为一个示例，公式(1)至公式(4)为第一接口的SSS生成公式：
Figure PCTCN2019080848-appb-000006
Figure PCTCN2019080848-appb-000007
Figure PCTCN2019080848-appb-000008
Figure PCTCN2019080848-appb-000009
公式(5)至公式(8)为第二接口的SSS生成公式：
Figure PCTCN2019080848-appb-000010
Figure PCTCN2019080848-appb-000011
Figure PCTCN2019080848-appb-000012
Figure PCTCN2019080848-appb-000013
其中，SSS 1(n)为SSS1为用于组成SSS基序列的第一个ZC序列。
SSS 2(n)为：SSS1为用于组成SSS基序列的第二个ZC序列。
u 1和u 2为：用于确定基序列的参数。
应理解，第一接口与第二接口的同步信号基序列结合不同，用户设备或者第二中继设备根据盲检同步信号即可获知应该使用的无线接口。
可选地，第一指示信息和第二指示信息还可以是广播消息、系统消息或者无限资源控制(radio resource control，RRC)消息。
作为一个示例，用户设备或者第二中继设备通过搜索同步信号接入网络时，第一中继设备或者基站可以在RRC消息中携带指示信息，以指示用户设备或者第二中继设备所使用的接口。
可选地，该RRC消息例如可以是RRC连接建立消息、RRC重建消息、RRC回复消息或者RRC重配置消息等中的一种或多种。
可选地，第一指示信息和第二指示信息包括的指示信息可以为隐式指示，例如，该指示信息指示第一中继设备或者第一设备的跳数，第一设备根据该跳数确定自身是否为第一跳节点，若是，则可以采用第一接口；若为非第一跳节点，则可以采用第二接口。
协议或者系统可以对多跳系统中中继设备所在的跳数的计数原则进行规定。例如，协议或者系统可以规定，基站为第0跳，接入基站的第一级中继节点为第1跳，之后每一级的中继节点的跳数依次加1。
此外，协议或者系统也可以规定，接入基站的第一级中继设备为第0跳，之后每一级的中继设备的跳数依次加1。
以上仅用于举例说明，本申请实施例对多跳系统中中继设备所在的跳数的计数原则并不限定。
可选地，第一指示信息和第二指示信息包括的指示信息也可以是显示指示，例如，接口类型指示。
可选地，由于不同接口对应的基序列集合、同步信号的周期、同步信号的时频位置、同步信号在一个固定时间周期内的偏移量或者PBCH时频位置不同，第一中继设备可以根据第一指示信息或者其他中继设备或者用户设备可以根据第二指示信息中包括的上述信息确定所使用的接口。
作为一个示例，中继设备或者用户设备可以根据参考消息获知其对应的无线接口的类型。例如，当该参考信息为同步信道基序列集合时，中继设备或者用户设备可以根据组成同步信道的基序列获取该基序列集合是由哪一无线接口的基序列集合中选取的，从而确定使用的无线接口类型。
可选地，中继设备或者用户设备通过搜索同步信号接入网络时，可以根据同步信号的基序列判断该基序列所在的基序列集合属于哪一接口，进而确定使用该接口；或者，中继设备或者用户设备可以根据PBCH的时频位置确定使用的无线接口的类型。
可选地，中继设备和用户设备分别根据第一指示信息和第二指示信息中携带的指示信息确定所使用的接口，该指示信息可以为明式指示信息或者隐式指示信息。例如，中继设备或者用户设备可以根据接收到的广播消息或者系统消息中携带的指示信息，确定使用的接口；或者，中继设备或者用户设备根据接收到的RRC消息中的指示信息确定所使用的接口。
可选地，中继设备或者用户设备还可以根据上级节点发送的跳数信息确定所使用的接 口。例如，当中继设备或者用户设备根据上级节点的广播消息或者系统消息确定自身为第一跳节点时，确定使用第一接口；当中继设备或者用户设备确定自身非第一跳节点时，确定使用第二接口。
本实施例通过上级节点向下级节点通知使用的无线接口，能够使下级节点有效的完成多跳网络中的传输，同时有效节约了多跳网络的公共资源开销。
本实施例通过在多跳网络中针对不同网元节点间使用不同的接口进行数据传输，使得第一中继设备可以复用父链路和子链路的接收流程，最小化接收模块复杂度，降低设备成本。此外，在中继设备和中继设备之间以及中继设备和用户设备之间使用第一接口或者第二接口进行数据传输，并对第一接口和第二接口进行设置，使得用户设备可以复用第一接口和第二接口的接收流程，降低处理数据的复杂度和设备成本。
当基站与第一中继设备通过第一接口进行数据传输，且第一中继设备与第二中继设备或者与用户设备通过第二接口进行数据传输时，对于第一中继设备而言，其对父链路(基站与第一中继设备之间的传输链路)和子链路(第一中继设备与第二中继设备或者第一中继设备与用户设备之间的传输链路)的发送或者接收时间需要对齐，以最小化交叉干扰，并延长保护间隔的时间长度，以保证滤波器拖尾的正常发送和收发转换。这一效果需要通过第一中继设备调整定时提前参数T A实现。
图7示出了一种定时提前的示意图。
由于基站与第一中继设备之间存在传输时延，基站接收到第一中继设备发送的上行信息的时间有滞后。在多跳网络通信系统中，第一中继设备与第二中继设备或者第一中继设备与用户设备之间的子链路也存在传输时延。第一中继设备的父链路和子链路上的发送或者接收时间需要对齐，具体地，第一中继设备向第二中继设备或者用户设备发送的下行信息的时间和第一中继设备向基站发送上行信息的时间需要对齐；或者，第一中继设备接收第二中继设备或者用户设备发送的上行信息的时间和第一中继设备接收基站发送的下行信息的时间需要对齐。
下文以第一中继设备在父链路和子链路的发送时间对齐为例进行说明。
作为一个示例，第一接口的无线帧的帧结构如图6(a)所示，第二接口的无线帧的帧结构如图6(b)所示。
应理解，第一中继设备与基站之间通过调整定时提前参数使第一中继设备向基站发送的上行信息的时间能够对齐。
作为一个示例，第一接口的定时提前量方案为：
T＝[(N TA+N TA-offset)·Ts]s
其中，T为通过第一接口进行传输时需要的时间提前量；
N TA为克服物理距离导致的时延而设置的时间提前量；
N TA-offset为基于无线帧中的保护时隙GAP而设置的时间提前量；
可选地，当第一接口的无线帧为图3所示的第一接口的无线帧时，为保证上行传输和下行传输之间转换时有必要的保护间隔，可以将上行传输的子帧UL提前20Ts(GAP的时长为40Ts)，以使得UL与下一个TTI的DL之间有时间长度为20Ts的保护间隔，此时，第一接口的N TA-offset＝20Ts。
应理解，基站与第一中继设备之间存在传输时延，第一中继设备与第二中继设备或者 第一中继设备与用户设备之间也存在传输时延，因此，第二接口的无线帧中用于调整时间提前量的GAP的时间长度可以根据所需要的时间提前量灵活设置。例如，在对第二接口的保护时隙GAP进行设置时，需要将第一中继设备父链路中的时间提前量和子链路的时间提前量均作为考虑因素，换句话说，第二接口的帧结构中保护时隙GAP的设置需要可以满足父链路和子链路所需要的时间提前量总和。
可选地，第二接口的无线帧中的下行子帧与上行子帧之间的GAP时间长度根据父链路中的时间提前量和子链路中的时间提前量进行设置。具体地，当第一接口的相邻无线帧之间的预设保护间隔为T时，第二接口预设时间提前量N TA-offset以使得第二接口的相邻的无线帧之间的间隔也为T。
作为一个示例，当第一接口的无线帧中的上行子帧提前20Ts后，该无线帧与下一个无线帧之间的间隔为20Ts，因此，第二接口需要的预设N TA-offset能够使得相邻无线帧之间的间隔也为20Ts，具体地，因为第二接口的相邻无线帧的间隔为40Ts，因而可以使前一个无线帧的上行子帧延迟20Ts，此时，N TA-offset＝-20Ts，其中“-”表示时间延迟。
可选地，对于第二接口，可以采用与上述第一接口同样的定时提前方案，但N TA-offset可以采用不同的值。例如，第i跳中继节点应满足如下关系：
2N TA-offset+N TA，i-1+N TA，i＝T RTT，i
其中，N TA，i-1为第i-1跳中继设备针对传输距离导致的时延的时间提前量；
N TA，i为第i-1跳中继设备针对传输距离导致的时延的时间提前量；
T RTT，i为第i跳设备与其父节点之间的信号往返时间；
可选地，由于N TA，i不能为负值，N TA-offset无法复用第一接口的值。
本实施例通过使第一接口和第二接口采用不同的N TA-offset值，保证第一中继设备父链路和子链路的发送或者接收时间能够对齐。
应理解，上文仅以第一接口和第二接口的无线帧的帧结构为图3所示时为例进行说明，但本申请并不限于此。
图8示出了本申请提供的通信装置的示意性结构图。图8所示的通信装置可以是上文提及的中继设备。通信装置800可用于实现上文中的由中继设备执行的步骤。通信装置800包括接收单元810和发送单元820。
接收单元810用于在第一设备(也即中继设备)接收第二设备送的第一指示消息，所述第一指示消息用于指示所述第一设备通过第一接口或者第二接口与所述第二设备进行数据传输，其中，当所述第二设备为基站时，所述第一指示消息指示所述第一设备通过所述第一接口与所述第二设备进行数据传输。
发送单元820用于向第三设备发送第二指示消息，所述第二指示消息用于指示所述第三设备通过所述第一接口或者第二接口与所述第一设备进行数据传输，其中，所述第二接口的至少一条上行物理信道与所述第一接口至少一条下行物理信道采用相同的调制方式，所述第一接口的上行物理信道和下行物理信道采用不同的调制方式。
应理解，在本发明实施例中，“与A相应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。
还应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在 三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能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，本申请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)执行本申请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，仅为本申请的具体实施方式，但本申请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申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (26)

  1. 一种数据传输的方法，其特征在于，包括：
    第一设备接收第二设备送的第一指示消息，所述第一指示消息用于指示所述第一设备通过第一接口或者第二接口与所述第二设备进行数据传输，其中，当所述第二设备为基站时，所述第一指示消息指示所述第一设备通过所述第一接口与所述第二设备进行数据传输；
    所述第一设备向第三设备发送第二指示消息，所述第二指示消息用于指示所述第三设备通过所述第一接口或者第二接口与所述第一设备进行数据传输，其中，所述第二接口的至少一条上行物理信道与所述第一接口至少一条下行物理信道采用相同的调制方式，所述第一接口的上行物理信道和下行物理信道采用不同的调制方式。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述第二接口的上行物理共享信道和所述第一接口的下行物理共享信道采用相同的编码方式；和/或
    所述第二接口的承载控制信息的上行物理信道和所述第一接口的承载控制信息的下行物理信道采用相同的编码方式。
  3. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    所述第二接口的上行物理共享信道与所述第二接口的下行物理共享信道采用相同的编码方式；和/或
    所述第二接口的承载控制信息的上行物理信道和所述第二接口的承载控制信息的下行物理信道采用相同的编码方式。
  4. 根据权利要求1-3中任一项所述的方法，其特征在于，所述方法还包括：
    所述第一接口的用于下行传输的物理资源和所述第二接口的用于下行的物理资源相同；和/或
    所述第二接口的用于上行传输的物理资源和所述第二接口的用于下行的物理资源相同。
  5. 根据权利要求4所述的方法，其特征在于，所述物理资源包括：
    时域资源和/或频域资源。
  6. 根据权利要求5所述的方法，其特征在于，所述时域资源包括：
    每传输时间间隔TTI中用于传输的时间和所述每TTI中的符号数量和所述每TTI中的符号时间长度。
  7. 根据权利要求6所述的方法，其特征在于，符号时间长度包括所述符号的循环前缀CP时间长度。
  8. 根据权利要求4-7中任一项所述的方法，其特征在于，所述频域资源包括：
    资源块的子载波个数和所述资源块特定位置的子载波的带宽，其中，所述资源块包括载波或者物理资源块。
  9. 根据权利要求1-8中任一项所述的方法，其特征在于，所述第一指示消息或者第二指示消息包括以下至少一种：
    同步信道基序列、同步信号的周期、同步信号在一个固定时间周期内的偏移量、物理广播信道PBCH时频位置、广播消息、系统消息或者无线资源控制RRC消息。
  10. 根据权利要求1-9中任一项所述的方法，其特征在于，所述方法还包括：
    所述第一接口的至少一个下行参考信号与所述第二接口的上行参考信号采用相同的基序列和/或资源块RE映射方式。
  11. 根据权利要求1-10中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二接口的至少一条上行物理信道和下行物理信道与所述第一接口的下行物理信道采用相同的阶数映射表格和/或传输块大小TBS表格。
  12. 根据权利要求1-11中任一项所述的方法，其特征在于，所述第一接口和所述第二接口采用不同的时间提前偏移量N TA-offset。
  13. 根据权利要求12所述的方法，其特征在于，当所述第一接口的相邻无线帧之间的预设间隔为T时，所述第二接口采用时间提前偏移量N TA-offset使所述第二接口的相邻无线帧之间的预设间隔也为T。
  14. 一种通信设备，其特征在于，包括：
    接收单元，用于接收第二设备送的第一指示消息，所述第一指示消息用于指示第一设备通过第一接口或者第二接口与所述第二设备进行数据传输，其中，当所述第二设备为基站时，所述第一指示消息指示所述第一设备通过所述第一接口与所述第二设备进行数据传输；
    发送单元，用于向第三设备发送第二指示消息，所述第二指示消息用于指示所述第三设备通过所述第一接口或者第二接口与所述第一设备进行数据传输，其中，所述第二接口的至少一条上行物理信道与所述第一接口至少一条下行物理信道采用相同的调制方式，所述第一接口的上行物理信道和下行物理信道采用不同的调制方式。
  15. 根据权利要求14所述的通信设备，其特征在于，所述第二接口的上行物理共享信道和所述第一接口的下行物理共享信道采用相同的编码方式；和/或
    所述第二接口的承载控制信息的上行物理信道和所述第一接口的承载控制信息的下行物理信道采用相同的编码方式。
  16. 根据权利要求14所述的通信设备，其特征在于，所述第二接口的上行物理共享信道与所述第二接口的下行物理共享信道采用相同的编码方式；和/或
    所述第二接口的承载控制信息的上行物理信道和所述第二接口的承载控制信息的下行物理信道采用相同的编码方式。
  17. 根据权利要求14-16中任一项所述的通信设备，其特征在于，所述第一接口的用于下行传输的物理资源和所述第二接口的用于下行的物理资源相同；和/或
    所述第二接口的用于上行传输的物理资源和所述第二接口的用于下行的物理资源相同。
  18. 根据权利要求17所述的通信设备，其特征在于，所述物理资源包括：
    时域资源和/或频域资源。
  19. 根据权利要求18所述的通信设备，其特征在于，所述时域资源包括：
    每传输时间间隔TTI中用于传输的时间和所述每TTI中的符号数量和所述每TTI中的符号时间长度。
  20. 根据权利要求19所述的通信设备，其特征在于，所述符号时间长度包括所述符号的循环前缀CP时间长度。
  21. 根据权利要求18-20中任一项所述的通信设备，其特征在于，所述频域资源包括：
    资源块的子载波个数和所述资源块特定位置的子载波的带宽，其中，所述资源块包括载波或者物理资源块。
  22. 根据权利要求14-21中任一项所述的通信设备，其特征在于，所述第一指示消息或者第二指示消息包括以下至少一种：
    同步信道基序列、同步信号的周期、同步信号在一个固定时间周期内的偏移量、物理广播信道PBCH时频位置、广播消息、系统消息或者无线资源控制RRC消息。
  23. 根据权利要求14-22中任一项所述的通信设备，其特征在于，所述方法还包括：
    所述第一接口的至少一个下行参考信号与所述第二接口的上行参考信号采用相同的基序列和/或资源块RE映射方式。
  24. 根据权利要求14-23中任一项所述的通信设备，其特征在于，所述方法还包括：
    所述第二接口的至少一条上行物理信道和下行物理信道与所述第一接口的下行物理信道采用相同的阶数映射表格和/或传输块大小TBS表格。
  25. 根据权利要求14-24中任一项所述的通信设备，其特征在于，所述第一接口和所述第二接口采用不同的时间提前偏移量N TA-offset。
  26. 根据权利要求25所述的通信设备，其特征在于，当所述第一接口的相邻无线帧之间的预设间隔为T时，所述第二接口采用时间提前偏移量N TA-offset使所述第二接口的相邻无线帧之间的预设间隔也为T。
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