WO2016141529A1 - 一种数据传输设备、方法及系统 - Google Patents

一种数据传输设备、方法及系统 Download PDF

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Publication number
WO2016141529A1
WO2016141529A1 PCT/CN2015/073883 CN2015073883W WO2016141529A1 WO 2016141529 A1 WO2016141529 A1 WO 2016141529A1 CN 2015073883 W CN2015073883 W CN 2015073883W WO 2016141529 A1 WO2016141529 A1 WO 2016141529A1
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WIPO (PCT)
Prior art keywords
frequency
downlink
terminal device
access network
network device
Prior art date
Application number
PCT/CN2015/073883
Other languages
English (en)
French (fr)
Inventor
戴喜增
李启明
韩静
李安俭
林凡奎
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201580035704.5A priority Critical patent/CN106664115B/zh
Priority to CN201910866230.9A priority patent/CN110740504A/zh
Priority to EP15884212.0A priority patent/EP3255804B1/en
Priority to EP19185323.3A priority patent/EP3654537A1/en
Priority to PCT/CN2015/073883 priority patent/WO2016141529A1/zh
Publication of WO2016141529A1 publication Critical patent/WO2016141529A1/zh
Priority to US15/699,108 priority patent/US10849188B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/005—Moving wireless networks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3216—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used where the road or rail vehicle is only used as transportation means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2201/00—Signalling devices
    • B63B2201/16—Radio

Definitions

  • the present invention relates to the field of communications, and in particular, to a data transmission device, method, and system.
  • the Doppler frequency shift phenomenon occurs in the high-speed rail mobile communication network. Therefore, it is highly likely that the UE cannot correctly demodulate the data transmitted by the base station, thereby causing the downlink average throughput of the UE to be low.
  • the UE In the prior art, the UE generally performs Doppler frequency offset estimation according to the received common reference signal (English: Common Reference Signal, CRS for short), and receives the demodulation reference signal sent by the base station (English: DeModulation Reference) Signal, referred to as DMRS) and data, first perform frequency compensation based on the estimated Doppler frequency offset, and then perform DMRS and data demodulation to improve the demodulation performance of DMRS and data, thereby improving the downlink average throughput of the UE. the amount.
  • CRS Common Reference Signal
  • DMRS DeModulation Reference
  • the error between the Doppler frequency offset obtained by the UE based on the CRS estimation and the Doppler frequency offset actually existing in the network will be larger, and The UE has a higher motion speed, and the higher the Doppler frequency offset actually exists in the network, the higher the Doppler frequency offset estimated by the UE, but the maximum Doppler frequency offset that the UE can compensate is such that As a result, the demodulation performance of the DMRS and the data is not ideal, resulting in a failure to improve the downlink average throughput of the UE.
  • Embodiments of the present invention provide a data transmission device, method, and system, which are intended to be better It is necessary to increase the downlink average throughput of the UE.
  • a first aspect of the present invention provides an access network device, which is applied to a high-speed mobile communication system, such as a high-speed rail mobile communication system, where the access network device includes: a determining unit and a transmitting unit;
  • the determining unit is configured to determine a downlink frequency offset according to the received uplink signal sent by the terminal device, and determine a second transmit frequency according to the downlink frequency offset and the first transmit frequency;
  • the sending unit is configured to send a downlink signal to the terminal device according to the second transmit frequency determined by the determining unit, so that the terminal device receives the downlink frequency based on a receiving frequency corresponding to the first transmit frequency.
  • a downlink signal where the downlink signal includes at least one of a demodulation reference signal DMRS and downlink data.
  • the sending unit is further configured to send the indication information to the terminal device before sending the downlink signal to the terminal device according to the second transmission frequency, where the indication information is used to indicate the access network device Frequency compensation has been performed.
  • the sending unit is specifically configured to send the indication information to the terminal device by using a radio resource control RRC connection reconfiguration message.
  • the sending unit is specifically configured to send the indication information to the terminal device by using a system message.
  • the determining unit is specifically configured to determine an uplink frequency offset according to the uplink signal, and determine the downlink frequency offset according to the uplink frequency offset;
  • the uplink frequency offset and the downlink frequency offset satisfy the following conditions:
  • ⁇ fDL 0.5* ⁇ fUL, where ⁇ fDL is the downlink frequency offset and ⁇ fUL is the uplink frequency offset.
  • the determining unit is further configured to determine, after determining an uplink frequency offset according to the uplink signal, that the uplink frequency offset is greater than a first preset threshold.
  • the determining unit is further configured to determine that the moving speed of the terminal device is greater than a second preset threshold before determining a downlink frequency offset according to the received uplink signal sent by the terminal device.
  • a second aspect of the present invention provides a terminal device, which is applied to a high-speed mobile communication system, such as a high-speed rail mobile communication system, the terminal device comprising: a receiving unit and a demodulation unit;
  • the receiving unit is configured to receive a downlink signal according to a receiving frequency, where the receiving frequency is corresponding to a first transmitting frequency, where the downlink signal is sent by the access network device to the terminal device according to a second transmitting frequency, where The second transmission frequency is determined according to the downlink frequency offset and the first transmission frequency, and the downlink signal includes at least one of a demodulation reference signal DMRS and downlink data;
  • the demodulation unit is configured to demodulate the downlink signal received by the receiving unit based on the receiving frequency.
  • the receiving unit is further configured to: before receiving the downlink signal based on the receiving frequency, receive the indication information sent by the access network device; the indication information is used to indicate that the access network device has performed frequency compensation.
  • a data transmission method for use in a high speed mobile communication system, such as a high-speed rail mobile communication system, the method comprising:
  • the access network device determines the downlink frequency offset according to the received uplink signal sent by the terminal device;
  • the access network device determines a second transmit frequency according to the downlink frequency offset and the first transmit frequency
  • the access network device sends a downlink signal to the terminal device based on the second transmit frequency, so that the terminal device receives the downlink signal based on a receiving frequency corresponding to the first transmit frequency; wherein, the downlink is
  • the signal includes at least one of a demodulation reference signal DMRS and downlink data.
  • the method before the sending network device sends a downlink signal to the terminal device based on the second transmit frequency, the method further includes:
  • the access network device sends indication information to the terminal device, where the indication information is used to indicate that the access network device has performed frequency compensation.
  • the access network device sends the indication information to the terminal device, including:
  • the access network device sends the indication information to the terminal device by using a radio resource control RRC connection reconfiguration message.
  • the access network device sends the indication information to the terminal device, including:
  • the access network device sends the indication information to the terminal device by using a system message.
  • the access network device determines, according to the received uplink signal sent by the terminal device, a downlink frequency offset, including:
  • the access network device determines an uplink frequency offset according to the uplink signal
  • the uplink frequency offset and the downlink frequency offset satisfy the following conditions:
  • ⁇ fDL 0.5* ⁇ fUL, where ⁇ fDL is the downlink frequency offset and ⁇ fUL is the uplink frequency offset.
  • the access network device determines the uplink frequency offset according to the uplink signal, Also includes:
  • the access network device determines that the uplink frequency offset is greater than a first preset threshold.
  • the method before the determining, by the access network device, the downlink frequency offset, the method further includes:
  • the access network device determines that the moving speed of the terminal device is greater than a second preset threshold.
  • a data transmission method for use in a high speed mobile communication system, such as a high-speed rail mobile communication system, the method comprising:
  • the terminal device receives the downlink signal based on the receiving frequency, where the receiving frequency corresponds to the first transmitting frequency, and the downlink signal is sent by the access network device to the terminal device based on the second transmitting frequency, the second transmitting frequency And determining, according to the downlink frequency offset and the first sending frequency, the downlink signal includes at least one of a demodulation reference signal DMRS and downlink data;
  • the terminal device demodulates the downlink signal based on the receiving frequency.
  • the method before the terminal device receives the downlink signal based on the receiving frequency, the method further includes:
  • the terminal device receives the indication information sent by the access network device, where the indication information is used to indicate that the access network device has performed frequency compensation.
  • a fifth aspect of the present invention provides an access network device, which is applied to a high-speed mobile communication system, such as a high-speed rail mobile communication system, where the access network device includes: a processor and a transmitter;
  • the processor is configured to determine a downlink frequency offset according to the received uplink signal sent by the terminal device, and determine a second transmit frequency according to the downlink frequency offset and the first transmit frequency;
  • the transmitter is configured to send a downlink signal to the terminal device according to the second transmit frequency determined by the processor, so that the terminal device receives the received signal according to a receiving frequency corresponding to the first transmit frequency.
  • a downlink signal where the downlink signal includes at least one of a demodulation reference signal DMRS and downlink data.
  • the transmitter is further configured to send indication information to the terminal device before sending the downlink signal to the terminal device according to the second transmit frequency, where the indication information is used to indicate the access network device Frequency compensation has been performed.
  • the transmitter is specifically configured to send the indication information to the terminal device by using a radio resource control RRC connection reconfiguration message.
  • the transmitter is specifically configured to send the indication information to the terminal device by using a system message.
  • the processor is specifically configured to determine an uplink frequency offset according to the uplink signal, and determine the downlink frequency offset according to the uplink frequency offset;
  • the uplink frequency offset and the downlink frequency offset satisfy the following conditions:
  • ⁇ fDL 0.5* ⁇ fUL, where ⁇ fDL is the downlink frequency offset and ⁇ fUL is the uplink frequency offset.
  • the processor is further configured to determine, after determining an uplink frequency offset according to the uplink signal, that the uplink frequency offset is greater than a first preset threshold.
  • the processor is further configured to determine that a moving speed of the terminal device is greater than a second preset threshold before determining a downlink frequency offset according to the received uplink signal sent by the terminal device.
  • a terminal device for use in a high-speed mobile communication system, such as a high-speed rail mobile communication system, the terminal device comprising: a receiver and a processor;
  • the receiver is configured to receive a downlink signal according to a receiving frequency, where the receiving frequency is corresponding to a first transmitting frequency, where the downlink signal is sent by the access network device to the terminal device according to a second transmitting frequency, where The second transmission frequency is determined according to the downlink frequency offset and the first transmission frequency, and the downlink signal includes at least one of a demodulation reference signal DMRS and downlink data;
  • the processor is configured to demodulate the downlink signal received by the receiver based on the receiving frequency.
  • the receiver is further configured to: before receiving the downlink signal based on the receiving frequency, receive the indication information sent by the access network device; the indication information is used to indicate that the access network device has performed frequency compensation.
  • a seventh aspect of the present invention provides a data transmission system including an access network device and a terminal device;
  • the access network device is configured to determine a downlink frequency offset according to the received uplink signal sent by the terminal device, and determine a second transmit frequency according to the downlink frequency offset and the first transmit frequency; Transmitting a downlink signal to the terminal device, so that the terminal device receives the downlink signal based on a receiving frequency corresponding to the first transmitting frequency, where the downlink signal includes at least a demodulation reference signal DMRS and downlink data.
  • DMRS demodulation reference signal
  • the terminal device is configured to receive a downlink signal based on a receiving frequency, and demodulate the downlink signal based on the receiving frequency, where the receiving frequency corresponds to a first transmitting frequency.
  • the access network device determines the second transmission frequency according to the determined downlink frequency offset and the first transmission frequency, so as to implement the first transmission. Frequency compensation of the frequency, and sending a downlink signal to the terminal device based on the second transmission frequency, because the performance of the access network device is better than the performance of the terminal device, that is, the estimated downlink frequency offset of the access network device and the actual existence in the network The error between the downlink frequency offsets is small, and the access network device can compensate for the higher downlink frequency offset. Therefore, before the access network device sends the downlink signal to the terminal device, the downlink network offset can be used by the access network device.
  • a transmission frequency is frequency compensated to obtain a second transmission frequency, and a downlink signal is sent to the terminal device based on the second transmission frequency, so that the downlink signal received by the terminal device is substantially free of frequency offset, so that the terminal device can directly base the
  • the receiving frequency corresponding to the transmitting frequency receives the downlink signal, and performs demodulation based on the receiving frequency, thereby improving the demodulation performance of the downlink signal, thereby improving the downlink average throughput of the terminal device.
  • FIG. 1 is a schematic structural diagram of an access network device according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a terminal device according to another embodiment of the present invention.
  • FIG. 3 is a flowchart of a data transmission method according to another embodiment of the present invention.
  • FIG. 4 is a flowchart of a data transmission method according to another embodiment of the present invention.
  • FIG. 5 is a flowchart of a data transmission method according to another embodiment of the present invention.
  • FIG. 6 is a flowchart of another data transmission method according to another embodiment of the present invention.
  • FIG. 7 is a flowchart of another data transmission method according to another embodiment of the present invention.
  • FIG. 8 is a flowchart of another data transmission method according to another embodiment of the present invention.
  • FIG. 9 is a flowchart of another data transmission method according to another embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of an access network device according to another embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a terminal device according to another embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of a data transmission system according to another embodiment of the present invention.
  • system and “network” are used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • the data transmission method provided by the embodiment of the present invention is applied to a high-speed mobile communication system, such as a high-speed rail mobile communication system, where the high-speed rail mobile communication system includes an access network device and a terminal device, and the access network device is a base station, and the terminal device is a UE.
  • the Doppler frequency shift phenomenon occurs in the high-speed rail mobile communication system, that is, the receiving frequency of the downlink signal (including at least one of the DMRS and the data) transmitted by the base station and the base station are received by the UE. There is an offset between the transmission frequencies.
  • the UE In order to improve the downlink average throughput of the UE, after receiving the downlink signal sent by the base station, the UE first performs frequency compensation on the reception frequency, and then receives the downlink signal according to the compensated reception frequency. And demodulation, however, due to the high motion speed of the UE, the Doppler frequency offset actually existing in the high-speed rail mobile communication system will be large, and the UE's compensation capability is limited, that is, the UE cannot compensate for the higher Doppler frequency offset. In this way, the UE receives and demodulates the downlink signal sent by the base station, so that the downlink average throughput of the UE cannot be improved.
  • the base station may perform frequency compensation on the first transmission frequency to obtain a second transmission frequency, and send a downlink signal to the terminal device according to the second transmission frequency.
  • the UE can receive substantially no offset between the receiving frequency of the downlink signal sent by the base station and the transmitting frequency of the base station, so that the UE can directly receive and demodulate the downlink signal based on the receiving frequency corresponding to the first transmitting frequency, thereby further It is good to improve the downlink average throughput of the UE.
  • An embodiment of the present invention provides an access network device.
  • the access network device includes: a determining unit 11 and a sending unit 12.
  • the determining unit 11 is configured to determine a downlink frequency offset according to the received uplink signal sent by the terminal device, and determine a second transmit frequency according to the determined downlink frequency offset and the first transmit frequency.
  • the sending unit 12 is configured to send a downlink signal to the terminal device based on the second transmit frequency determined by the determining unit 11, so that the terminal device receives the downlink signal based on the receiving frequency corresponding to the first frequency, where the downlink signal includes at least the demodulation reference signal.
  • One of DMRS and downstream data is configured to send a downlink signal to the terminal device based on the second transmit frequency determined by the determining unit 11, so that the terminal device receives the downlink signal based on the receiving frequency corresponding to the first frequency, where the downlink signal includes at least the demodulation reference signal.
  • One of DMRS and downstream data is configured to send a downlink signal to the terminal device based on the second transmit frequency determined by the determining unit 11, so that the terminal device receives the downlink signal based on the receiving frequency corresponding to the first frequency, where the downlink signal includes at least the demodulation reference signal.
  • One of DMRS and downstream data is configured to send a downlink signal to the terminal device based on the second transmit frequency determined by
  • the sending unit 12 is further configured to send the indication information to the terminal device before sending the downlink signal to the terminal device based on the second transmission frequency.
  • the indication information is used to indicate that the access network device has performed frequency compensation.
  • the sending unit 12 is specifically configured to send the indication information to the terminal device by using a radio resource control (English: Radio Resource Control, RRC for short) connection reconfiguration message.
  • a radio resource control English: Radio Resource Control, RRC for short
  • the sending unit 12 is specifically configured to send the indication information to the terminal device by using a system message.
  • the determining unit 11 is specifically configured to determine an uplink frequency offset according to the received uplink signal sent by the terminal device, and determine a downlink frequency offset according to the estimated uplink frequency offset.
  • the application scenario of the public network deployment is performed for the mobile communication system, and the determining unit 11 is further configured to: after determining the uplink frequency offset according to the uplink signal, determining that the uplink frequency offset is greater than the first preset threshold. .
  • the application scenario of the public network deployment is adopted for the mobile communication system, and the determining unit 11 is further configured to determine the terminal device before determining the downlink frequency offset according to the uplink signal sent by the received terminal device.
  • the moving speed is greater than the second preset threshold.
  • the access network device provided by the embodiment of the present invention, after determining the downlink frequency offset, the root Determining a second transmission frequency according to the determined downlink frequency offset and the first transmission frequency, so as to implement frequency compensation for the first transmission frequency, and transmitting a downlink signal to the terminal device based on the second transmission frequency, because the performance of the access network device is excellent.
  • the performance of the terminal device that is, the error between the estimated downlink frequency offset of the access network device and the downlink frequency offset actually existing in the network is small, and the access network device can compensate for the higher downlink frequency offset.
  • the access network device may estimate the downlink frequency offset, and perform frequency compensation on the first transmit frequency according to the estimated downlink frequency offset to obtain the second transmit frequency, and based on The second transmitting frequency sends a downlink signal to the terminal device, so that the downlink signal received by the terminal device is substantially free of frequency offset, so that the terminal device can directly receive the downlink signal based on the receiving frequency corresponding to the first transmitting frequency, and based on the The receiving frequency is demodulated, which improves the demodulation performance of the downlink signal, thereby improving the downlink average throughput of the terminal device.
  • the terminal device may include: a receiving unit 21 and a demodulating unit 22.
  • the receiving unit 21 is configured to receive a downlink signal according to the receiving frequency, where the receiving frequency is corresponding to the first transmitting frequency, where the downlink signal is sent by the access network device to the terminal device according to the second transmitting frequency, and the second transmitting frequency is The downlink signal is determined according to the downlink frequency offset and the first transmission frequency, and the downlink signal includes at least one of DMRS and downlink data.
  • the demodulation unit 22 is configured to demodulate the downlink signal received by the receiving unit 21 based on the receiving frequency.
  • the receiving unit 21 is further configured to receive the indication information sent by the access network device before receiving the downlink signal based on the receiving frequency.
  • the indication information is used to indicate that the access network device has performed frequency compensation.
  • the terminal device receives a downlink signal based on a receiving frequency corresponding to the first transmitting frequency, where the downlink signal is sent by the access network device to the terminal device according to the second transmitting frequency, and the second transmitting frequency is the access network.
  • the device is determined according to the downlink frequency offset and the first transmission frequency, and after receiving the downlink signal, the downlink signal can be demodulated according to the receiving frequency, because the performance of the access network device is better than the performance of the terminal device, that is, The estimated downlink frequency offset of the access network equipment and the actual downlink frequency existing in the network The error between the offsets is small, and the access network device can compensate for the higher downlink frequency offset.
  • the downlink network offset can be estimated by the access network device. And performing frequency compensation on the first transmit frequency according to the estimated downlink frequency offset to obtain a second transmit frequency, and sending a downlink signal to the terminal device based on the second transmit frequency, so that the downlink signal received by the terminal device is substantially free of frequency offset.
  • the terminal device can directly receive the downlink signal based on the receiving frequency corresponding to the first transmitting frequency, and perform demodulation based on the receiving frequency, thereby improving the demodulation performance of the downlink signal, thereby improving the downlink average throughput of the terminal device.
  • a data transmission method is provided in another embodiment of the present invention. As shown in FIG. 3, the method may include:
  • the access network device determines a downlink frequency offset according to the received uplink signal sent by the terminal device.
  • the access network device determines a second transmit frequency according to the downlink frequency offset and the first transmit frequency.
  • the first transmit frequency may be frequency compensated according to the downlink frequency offset to obtain the second transmit frequency.
  • the access network device sends a downlink signal to the terminal device based on the second transmit frequency, so that the terminal device receives the downlink signal based on the receive frequency corresponding to the first transmit frequency.
  • the downlink signal may include at least one of DMRS and downlink data.
  • the receiving frequency corresponding to the first transmitting frequency refers to that there is no offset between the receiving frequency and the first transmitting frequency, that is, the receiving frequency and the first transmitting frequency are substantially equal in value.
  • the access network device determines the second transmission frequency according to the determined downlink frequency offset and the first transmission frequency, so as to implement frequency compensation for the first transmission frequency. And sending a downlink signal to the terminal device based on the second transmission frequency, because the performance of the access network device is better than the performance of the terminal device, that is, the estimated downlink frequency offset of the access network device and the actual downlink frequency offset in the network. The error between the two is small, and the access network device can compensate for the higher downlink frequency offset.
  • the access network device may estimate the downlink frequency offset, and perform frequency compensation on the first transmit frequency according to the estimated downlink frequency offset to obtain a second transmit frequency, and
  • the second transmitting frequency sends a downlink signal to the terminal device, so that the downlink signal received by the terminal device is substantially free of frequency offset, so that the terminal device can directly receive the downlink signal based on the receiving frequency corresponding to the first transmitting frequency, and is based on the receiving frequency.
  • the demodulation is performed to improve the demodulation performance of the downlink signal, thereby improving the downlink average throughput of the terminal device.
  • the access network device needs to send the indication information to the terminal device before performing S303.
  • the indication information is used to indicate that the access network device has performed frequency compensation.
  • the indication information may also be used to indicate that the terminal device does not need to continue the frequency compensation.
  • the specific role of the indication information is not specifically limited in the embodiment of the present invention.
  • the process for the access network device to send the indication information to the terminal device may be: the access network device sends the indication information to the terminal device by using the RRC connection reconfiguration message.
  • the process for the access network device to send the indication information to the terminal device may be: the access network device sends the indication information to the terminal device by using the system message.
  • S301 is specifically: the access network device determines an uplink frequency offset according to the received uplink signal sent by the terminal device, and determines a downlink frequency offset according to the determined uplink frequency offset.
  • the application scenario of the public network deployment is adopted for the mobile communication system.
  • the access network device determines the uplink frequency offset according to the uplink signal, it may be determined whether the uplink frequency offset is greater than the first preset. And determining a downlink frequency offset according to the uplink frequency offset when determining that the uplink frequency offset is greater than the first preset threshold.
  • the mobile communication system is adopted.
  • the access network device needs to determine whether the moving speed of the terminal device is greater than a second preset threshold, and when it is determined that the moving speed of the terminal device is greater than a second preset threshold, S301.
  • a data transmission method is provided in another embodiment of the present invention. As shown in FIG. 4, the method may include:
  • the terminal device receives the downlink signal based on the receiving frequency.
  • the receiving frequency corresponds to the first transmitting frequency.
  • the downlink signal is sent by the access network device to the terminal device according to the second transmission frequency, and the second transmission frequency is determined by the access network device according to the downlink frequency offset and the first transmission frequency, and the downlink signal includes at least the DMRS and the downlink data.
  • the terminal device demodulates the downlink signal based on the receiving frequency.
  • the downlink signal may be demodulated based on the receiving frequency, so that the downlink signal is successfully received after successfully demodulating the downlink signal.
  • the terminal device receives the downlink signal based on the receiving frequency corresponding to the first transmitting frequency, where the downlink signal is sent by the access network device to the terminal device according to the second transmitting frequency, and the second transmitting frequency is
  • the access network device determines the downlink signal according to the downlink frequency offset and the first transmission frequency, and after receiving the downlink signal, may demodulate the downlink signal based on the receiving frequency, because the performance of the access network device is better than the performance of the terminal device, That is to say, the error between the estimated downlink frequency offset of the access network device and the downlink frequency offset actually existing in the network is small, and the access network device can compensate for the higher downlink frequency offset, and therefore, the access network device Before the terminal device sends the downlink signal, the access network device may estimate the downlink frequency offset, and perform frequency compensation on the first transmit frequency according to the estimated downlink frequency offset to obtain a second transmit frequency, and send the second transmit frequency to the terminal device based on the second transmit frequency.
  • the terminal device receives the indication information sent by the access network device.
  • the indication information is used to indicate that the access network device has performed frequency compensation.
  • the terminal device in the embodiment of the present invention may be a UE or a relay, and the corresponding terminal device may be selected according to the requirements of the actual application scenario, which is not limited herein.
  • the embodiment of the present invention is only used as an example of the LTE system in the mobile communication system.
  • the embodiment of the present invention may also be applied to other mobile communication systems, which is not limited herein.
  • Another embodiment of the present invention provides a data transmission method.
  • the specific implementation process of the data transmission method provided by the embodiment of the present invention is detailed according to different application scenarios. Description, as follows:
  • the access network device is a base station composed of a BBU and an RRU, and the terminal device is a UE.
  • the data transmission method in the application scenario is as shown in FIG. 5 .
  • the specific method may include:
  • the BBU determines a downlink frequency offset according to the received uplink signal sent by the UE.
  • the S501 may include the S5011-S5012:
  • the BBU determines an uplink frequency offset according to the received uplink signal sent by the UE.
  • the BBU can determine the uplink frequency offset according to the received uplink signal to implement estimation of the frequency offset of the uplink.
  • the BBU determines the downlink frequency offset according to the uplink frequency offset.
  • the BBU After the BBU determines the uplink frequency offset according to the received uplink signal sent by the UE, the BBU can determine the downlink frequency offset according to the determined uplink frequency offset.
  • ⁇ fDL the downlink frequency offset
  • ⁇ fUL the uplink frequency offset
  • the RRU determines a second transmit frequency according to the downlink frequency offset and the first transmit frequency.
  • the RRU may perform frequency compensation on the first transmit frequency according to the calculated downlink frequency offset to obtain a second transmit frequency.
  • the first transmission frequency is a frequency that the RRU corresponds to according to a preset frequency point used for data transmission by the UE.
  • the RRU sends the indication information to the UE.
  • the indication information is used to indicate that the RRU has performed frequency compensation.
  • the number of bits of the indication information may be 1, and generally “1" may be used to indicate that the RRU has been frequency compensated, and "0" is used to indicate that the RRU is not frequency compensated.
  • the RRU may send the indication information to the UE by using an RRC connection reconfiguration message, or may send the indication information to the UE by using a system message.
  • the access network device may first execute S501-S502, then execute S503, or execute S503 first, and then execute S501-S502 (that is, after the UE accesses the high-speed rail mobile communication network, the RRU may The UE sends the indication information to enable the UE to learn that the RRU performs the frequency compensation on the first transmission frequency of the bearer downlink signal.
  • the implementation sequence of the S501-S502 and the S503 is not limited in the embodiment of the present invention, and may be based on the actual application scenario. Different choices are made.
  • the RRU sends a downlink signal to the UE according to the second transmit frequency, so that the UE receives the downlink signal based on the receive frequency corresponding to the first transmit frequency.
  • the downlink signal may include at least one of DMRS and downlink data.
  • the RRU may send the downlink signal to the UE based on the second transmit frequency.
  • the second transmit frequency is equal to a difference between the first transmit frequency and the downlink frequency offset.
  • the UE receives the indication information sent by the RRU.
  • the UE receives the downlink signal based on the receiving frequency.
  • the receiving frequency corresponds to the first transmitting frequency.
  • the downlink signal is sent by the RRU to the UE according to the second transmission frequency, and the second transmission frequency is determined by the RRU according to the downlink frequency offset and the first transmission frequency, and the downlink signal may include at least one of the DMRS and the downlink data.
  • the downlink signal may include at least one of the DMRS and the downlink data.
  • the UE demodulates the downlink signal based on the receiving frequency.
  • the UE After the UE receives the indication information sent by the RRU, the UE can learn that the RRU has performed frequency compensation before transmitting the downlink signal, so that the UE can receive the downlink signal according to the receiving frequency (the receiving frequency and the first transmitting frequency). Correspondingly, that is, the UE can directly receive and demodulate the downlink signal based on the receiving frequency, and no longer needs to obtain the downlink frequency offset according to the CRS estimation, and then perform channel estimation and demodulation of the downlink signal according to the estimated downlink frequency offset.
  • the RRU may perform frequency compensation on the first transmit frequency according to the determined downlink frequency offset. Transmitting a frequency, and transmitting a downlink signal to the UE based on the second transmission frequency, because the RRU compensates the first transmission frequency before transmitting the downlink signal, so that the downlink signal received by the UE is substantially free of frequency offset, so that the UE
  • the downlink signal can be directly received and demodulated based on the receiving frequency corresponding to the first transmitting frequency, thereby improving the demodulation performance of the downlink signal, thereby improving the downlink average throughput of the UE.
  • the network is deployed by the independent base station.
  • the access network device is the eNodeB and the terminal device is the UE.
  • the data transmission method in the application scenario is as shown in FIG. 6.
  • the specific method may include:
  • the eNodeB determines a downlink frequency offset according to the received uplink signal sent by the UE.
  • the S601 may include S6011-S6012:
  • the eNodeB determines an uplink frequency offset according to the received uplink signal sent by the UE.
  • the eNodeB determines the downlink frequency offset according to the uplink frequency offset.
  • the eNodeB determines a second transmit frequency according to the downlink frequency offset and the first transmit frequency.
  • the eNodeB sends the indication information to the UE.
  • the indication information is used to indicate that the eNodeB has performed frequency compensation.
  • the eNodeB sends a downlink signal to the UE according to the second transmit frequency, so that The UE receives the downlink signal based on the reception frequency corresponding to the first transmission frequency.
  • the UE receives the indication information sent by the eNodeB.
  • the UE receives the downlink signal based on the receiving frequency.
  • the receiving frequency corresponds to the first transmitting frequency.
  • the UE demodulates the downlink signal based on the receiving frequency.
  • the eNodeB can perform frequency compensation on the first transmission frequency according to the determined downlink frequency offset. Transmitting a frequency, and transmitting a downlink signal to the UE based on the second transmission frequency, because the eNodeB compensates the first transmission frequency before transmitting the downlink signal, so that the downlink signal received by the UE is substantially free of frequency offset, so that the UE
  • the downlink signal can be directly received and demodulated based on the receiving frequency corresponding to the first transmitting frequency, thereby improving the demodulation performance of the downlink signal, thereby improving the downlink average throughput of the UE.
  • the access network device is the eNodeB
  • the terminal device is the UE.
  • the data transmission method in the application scenario is as shown in FIG. 7.
  • the specific method may include:
  • the eNodeB determines that the moving speed of the UE is greater than a second preset threshold.
  • the second preset threshold may be 300 km/h
  • the eNodeB may obtain the moving speed of the UE by using a positioning manner, for example, the eNodeB locates the location 1 where the UE is located at the current time, and locates the UE again after the predetermined time interval. At position 2, then according to the distance between position 2 and position 1, and the predetermined time period, the moving speed of the UE can be obtained.
  • the eNodeB determines that the moving speed of the UE is not greater than the second preset threshold
  • the eNodeB may perform data transmission with the UE by using a solution provided by the prior art.
  • the eNodeB can also determine the moving speed of the UE by determining the switching frequency of the UE or the frequency at which the UE performs cell reselection.
  • the present invention is not limited herein.
  • the data transmission method provided by the present invention may be used for data transmission with the UE, or may be performed by using the solution provided by the prior art. The specific method may be selected according to the requirements of the actual application scenario, and the embodiment of the present invention is not specifically limited herein.
  • the BBU determines whether the moving speed of the UE is greater than a second preset threshold, and the process in which the BBU obtains the moving speed of the UE may obtain the UE by referring to the eNodeB. The process of moving speed will not be repeated here.
  • the eNodeB determines a downlink frequency offset according to the received uplink signal sent by the UE.
  • S702 may include S7021-S7022:
  • the eNodeB determines an uplink frequency offset according to the received uplink signal sent by the UE.
  • the eNodeB determines a downlink frequency offset according to the uplink frequency offset.
  • the eNodeB determines the second transmit frequency according to the downlink frequency offset and the first transmit frequency.
  • the eNodeB sends the indication information to the UE.
  • the indication information is used to indicate that the eNodeB has performed frequency compensation.
  • the eNodeB sends a downlink signal to the UE according to the second transmit frequency, so that the UE receives the downlink signal based on the receive frequency corresponding to the first transmit frequency.
  • the UE receives the indication information sent by the eNodeB.
  • the UE receives the downlink signal based on the receiving frequency.
  • the receiving frequency corresponds to the first transmitting frequency.
  • the UE demodulates the downlink signal based on the receiving frequency.
  • the S701-S708 in the embodiment of the present invention is only an example in which the access network device is an eNodeB.
  • the access network device is a base station composed of a BBU and an RRU
  • the base station consists of the BBU and the RRU.
  • the eNodeB may also determine whether to adopt the data transmission method provided by the present invention by determining whether the uplink frequency offset determined in S7021 is greater than a first preset threshold, that is, after S7021, if the eNodeB determines that the uplink frequency offset is greater than the first
  • a predetermined threshold is used to perform data transmission with the UE by using the data transmission method provided by the present invention. If the eNodeB determines that the uplink frequency offset is smaller than the first preset threshold, the data transmission is performed by using the solution provided by the prior art.
  • the data transmission method provided by the present invention may be used for data transmission with the UE, and the data provided by the prior art may be used for data transmission, and the specific method may be The requirements of the actual application scenario are selected, and the embodiments of the present invention are not specifically limited herein.
  • the eNodeB may determine the downlink frequency offset according to the received uplink signal sent by the UE, and according to the determined downlink frequency offset, The first transmit frequency is frequency compensated to obtain a second transmit frequency, and the downlink signal is sent to the UE based on the second transmit frequency. Since the eNodeB compensates the first transmit frequency before transmitting the downlink signal, the UE can receive the downlink transmit frequency.
  • the downlink signal is substantially free of frequency offset, so that the UE can directly receive and demodulate the downlink signal based on the receiving frequency corresponding to the first transmitting frequency, thereby improving the demodulation performance of the downlink signal, thereby improving the downlink average throughput of the UE.
  • the access network device is an eNodeB or a base station composed of a BBU and an RRU, and the terminal device is a UE, and the access network device is an eNodeB as an example.
  • the data transmission method is shown in FIG. 8. Specifically, the method may include:
  • the eNodeB determines a downlink frequency offset according to the received uplink signal sent by the UE.
  • the S801 may include S8011-S8012:
  • the eNodeB determines an uplink frequency offset according to the received uplink signal sent by the UE.
  • the eNodeB determines the downlink frequency offset according to the uplink frequency offset.
  • the eNodeB determines the second transmit frequency according to the downlink frequency offset and the first transmit frequency.
  • the eNodeB sends the indication information to the UE by using a relay.
  • the indication information is used to indicate that the eNodeB has performed frequency compensation.
  • the eNodeB sends a downlink signal to the UE by using a repeater according to the second transmit frequency, so that the UE receives the downlink signal based on the receive frequency corresponding to the first transmit frequency.
  • the Repeater After receiving the downlink signal sent by the eNodeB based on the second transmission frequency, the Repeater amplifies the power of the received downlink signal, and then sends the power amplified downlink signal to the UE.
  • the UE receives indication information that is sent by the eNodeB through a relay.
  • the UE receives, according to the receiving frequency, a downlink signal that is sent by the eNodeB through a relay.
  • the receiving frequency corresponds to the first transmitting frequency.
  • the UE demodulates the downlink signal based on the receiving frequency.
  • the S801-S807 in the embodiment of the present invention is only an example in which the access network device is an eNodeB.
  • the access network device is a base station composed of a BBU and an RRU
  • the base station consists of the BBU and the RRU.
  • the eNodeB can perform frequency compensation on the first transmission frequency according to the determined downlink frequency offset. Transmitting a frequency, and transmitting a downlink signal to the UE through the Repeater based on the second transmission frequency, because the eNodeB compensates the first transmission frequency before transmitting the downlink signal, so that the downlink signal received by the UE is substantially free of frequency offset.
  • the UE can directly receive and demodulate based on the receiving frequency corresponding to the first transmitting frequency, thereby improving the solution of the downlink signal. Adjust the performance, which improves the downlink average throughput of the UE.
  • the access network device is an eNodeB or a base station composed of a BBU and an RRU, and the terminal device is a relay, and the access network device is an eNodeB as an example.
  • the data transmission method is shown in FIG. 9. Specifically, the method may include:
  • the eNodeB determines a downlink frequency offset according to the uplink signal sent by the received Relay.
  • S901 may include S9011-S9012:
  • S9011 and eNodeB determine an uplink frequency offset according to the uplink signal sent by the received Relay.
  • the eNodeB determines the downlink frequency offset according to the uplink frequency offset.
  • the eNodeB determines the second transmit frequency according to the downlink frequency offset and the first transmit frequency.
  • the eNodeB sends the indication information to the Relay.
  • the indication information is used to indicate that the eNodeB has performed frequency compensation.
  • the eNodeB downlinks the signal to the relay based on the second transmit frequency, so that the UE receives the downlink signal based on the receive frequency corresponding to the first transmit frequency.
  • the Relay receives the indication information sent by the eNodeB.
  • the Relay receives the downlink signal based on the receiving frequency.
  • the receiving frequency corresponds to the first transmitting frequency.
  • the Relay demodulates the downlink signal based on the receiving frequency.
  • the Relay regenerates the downlink signal according to the link quality between the UE and the UE, and sends the downlink signal to the UE.
  • the S901-S907 in the embodiment of the present invention is only an example in which the access network device is an eNodeB.
  • the access network device is a base station composed of a BBU and an RRU
  • the base station consists of the BBU and the RRU.
  • the data transmission method with the UE can Referring to the description in S901-S907 in the embodiment of the present invention, the embodiments of the present invention are not described herein again.
  • the eNodeB can perform frequency compensation on the first transmission frequency according to the determined downlink frequency offset to obtain the second transmission. Frequency, and sending a downlink signal to the relay based on the second transmission frequency, because the eNodeB compensates the first transmission frequency before transmitting the downlink signal, so that the downlink signal received by the Relay can be substantially free of frequency offset, so that the relay can Receiving and demodulating the downlink signal based on the receiving frequency corresponding to the first transmitting frequency improves the demodulation performance of the downlink signal, thereby improving the downlink average throughput of the Relay.
  • the relay can re-schedule the UE under its coverage, and there is no relative movement between the relay and the UE. Therefore, the technical solution provided by the embodiment of the present invention improves the UE.
  • the average downstream throughput improves the UE.
  • the access network device may include: a processor 1001 and a transmitter 1002.
  • the processor 1001 is configured to determine a downlink frequency offset according to the received uplink signal sent by the terminal device, and determine a second transmit frequency according to the downlink frequency offset and the first transmit frequency.
  • the transmitter 1002 is configured to send a downlink signal to the terminal device according to the second transmit frequency determined by the processor 1001, so that the terminal device receives the downlink according to a receiving frequency corresponding to the first transmit frequency.
  • a signal wherein the downlink signal includes at least one of a demodulation reference signal DMRS and downlink data.
  • the transmitter 1002 is further configured to: send the indication information to the terminal device before sending the downlink signal to the terminal device based on the second transmit frequency; wherein the indication The information is used to indicate that the access network device has performed frequency compensation.
  • the transmitter 1002 is specifically configured to send the indication information to the terminal device by using a radio resource control RRC connection reconfiguration message.
  • the transmitter 1002 is specifically configured to pass the system.
  • the system message sends the indication information to the terminal device.
  • the processor 1001 is specifically configured to determine an uplink frequency offset according to the uplink signal, and determine the downlink frequency offset according to the uplink frequency offset.
  • the uplink frequency offset and the downlink frequency offset satisfy the following conditions:
  • ⁇ fDL 0.5* ⁇ fUL, where ⁇ fDL is the downlink frequency offset and ⁇ fUL is the uplink frequency offset.
  • the processor 1001 is further configured to: after determining an uplink frequency offset according to the uplink signal, determining that the uplink frequency offset is greater than a first preset threshold.
  • the processor 1001 is further configured to determine that the moving speed of the terminal device is greater than a second preset threshold before determining the downlink frequency offset according to the received uplink signal sent by the terminal device.
  • the access network device After determining the downlink frequency offset, the access network device according to the embodiment of the present invention determines the second transmit frequency according to the determined downlink frequency offset and the first transmit frequency, so as to implement frequency compensation for the first transmit frequency, and is based on The second transmission frequency sends a downlink signal to the terminal device, because the performance of the access network device is better than the performance of the terminal device, that is, between the estimated downlink frequency offset of the access network device and the downlink frequency offset actually existing in the network. The error is small, and the access network device can compensate for the higher downlink frequency offset.
  • the access network device can estimate the downlink frequency offset, and according to the estimated The downlink frequency offset performs frequency compensation on the first transmission frequency to obtain a second transmission frequency, and sends a downlink signal to the terminal device based on the second transmission frequency, so that the downlink signal received by the terminal device is substantially free of frequency offset, so that the terminal device
  • the downlink signal can be directly received based on the receiving frequency corresponding to the first transmitting frequency, and demodulated based on the receiving frequency, which is improved. Row signal demodulation performance, thereby improving downlink average throughput of the terminal device.
  • the terminal device may include: a receiver 1101 and a processor 1102.
  • the receiver 1101 is configured to receive a downlink signal according to a receiving frequency, where the receiving frequency is corresponding to a first transmitting frequency, and the downlink signal is an access network device based on a second Sending a transmission frequency to the terminal device, where the second transmission frequency is determined by the access network device according to a downlink frequency offset and the first transmission frequency, where the downlink signal includes at least a demodulation reference signal DMRS and a downlink One of the data.
  • the processor 1102 is configured to demodulate the downlink signal received by the receiver 1101 based on the receiving frequency.
  • the receiver 1101 is further configured to: before receiving the downlink signal based on the receiving frequency, receive the indication information sent by the access network device; the indication information is used to indicate the access network.
  • the device has been frequency compensated.
  • the terminal device receives a downlink signal based on a receiving frequency corresponding to the first transmitting frequency, where the downlink signal is sent by the access network device to the terminal device according to the second transmitting frequency, and the second transmitting frequency is the access network.
  • the device is determined according to the downlink frequency offset and the first transmission frequency, and after receiving the downlink signal, the downlink signal can be demodulated based on the receiving frequency, because the performance of the access network device is better than the performance of the terminal device, that is, The error between the estimated downlink frequency offset of the access network device and the downlink frequency offset actually existing in the network is small, and the access network device can compensate for the higher downlink frequency offset. Therefore, the access network device sends the downlink frequency offset to the terminal device.
  • the access network device may estimate the downlink frequency offset, perform frequency compensation on the first transmit frequency according to the estimated downlink frequency offset to obtain a second transmit frequency, and send a downlink signal to the terminal device based on the second transmit frequency.
  • the downlink signal received by the terminal device can be substantially free of frequency offset, so that the terminal device can directly base with the first Radio frequency corresponding to a downlink frequency of a reception signal, based on the reception frequency and demodulates a downlink signal demodulation performance improves, thereby improving the downlink average throughput of the terminal device.
  • the system includes: an access network device 1201 and a terminal device 1202.
  • the access network device 1201 is configured to determine, according to the received uplink signal sent by the terminal device 1202, a downlink frequency offset, and determine, according to the downlink frequency offset and the first transmit frequency, a second transmit frequency, based on the second transmit Transmitting a downlink signal to the terminal device, so that the terminal device 1202 receives the downlink signal based on a receiving frequency corresponding to the first transmitting frequency; wherein the downlink signal includes at least a demodulation reference One of the signal DMRS and downlink data.
  • the terminal device 1202 is configured to receive a downlink signal based on the receiving frequency, and demodulate the downlink signal based on the receiving frequency, where the receiving frequency corresponds to the first transmitting frequency.
  • the access network device determines the second transmission frequency according to the determined downlink frequency offset and the first transmission frequency, so as to implement frequency compensation for the first transmission frequency. And sending a downlink signal to the terminal device based on the second transmission frequency, because the performance of the access network device is better than the performance of the terminal device, that is, the estimated downlink frequency offset of the access network device and the actual downlink frequency offset in the network. The error between the two is small, and the access network device can compensate for the higher downlink frequency offset.
  • the downlink network offset can be estimated by the access network device, and Performing frequency compensation on the first transmit frequency according to the estimated downlink frequency offset to obtain a second transmit frequency, and transmitting a downlink signal to the terminal device based on the second transmit frequency, so that the downlink signal received by the terminal device is substantially free of frequency offset.
  • the terminal device can receive the downlink signal directly based on the receiving frequency corresponding to the first transmitting frequency, and perform the downlink signal based on the receiving frequency. Tone, enhance the demodulation performance of the downlink signal, thereby increasing the average throughput of downlink terminal device.
  • the disclosed apparatus and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used.
  • the combination may be integrated into another device, or some features may be ignored or not performed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit. It can be electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may be one physical unit or multiple physical units, that is, may be located in one place, or may be distributed to multiple different places. . Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a readable storage medium. Based on such understanding, the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a device (which may be a microcontroller, chip, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read only memory (English: Read-Only Memory, abbreviated as: ROM), a random access memory (English: Random Access Memory, abbreviated as: RAM), a magnetic disk or an optical disk, and the like.
  • ROM Read-Only Memory
  • RAM Random Access Memory

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Abstract

本发明实施例公开了一种数据传输设备、方法及系统，涉及通信领域，旨在更好得提高UE的下行平均吞吐量。具体方案为：确定单元根据接收到的终端设备发送的上行信号确定下行频偏，并根据下行频偏和第一发射频率确定第二发射频率；发送单元基于确定单元确定出的第二发射频率向终端设备发送下行信号，以便终端设备基于与第一发射频率对应的接收频率接收下行信号；其中，下行信号至少包括DMRS和下行数据中的一种。本发明用于数据传输过程中。

Description

一种数据传输设备、方法及系统 技术领域
本发明涉及通信领域，尤其涉及一种数据传输设备、方法及系统。
背景技术
随着高铁的迅速发展，人们在出行时，往往选择乘坐如高铁之类的便捷交通工具，且随着用户终端(英文：User Equipment，简称：UE)的广泛应用，人们在乘坐高铁时，对高铁移动通信网络的数据业务需求日益增长，因此，如何提高高铁移动通信网络中UE的吞吐量是运营商较为关注的问题。
在UE高速移动的过程中，高铁移动通信网络会出现多普勒频移现象，这样，极有可能导致UE无法正确解调基站发送的数据，从而导致UE的下行平均吞吐量偏低。在现有技术中，UE通常根据接收到的公共参考信号(英文：Common Reference Signal，简称：CRS)进行多普勒频偏估计，并在接收到基站发送的解调参考信号(英文：DeModulation Reference Signal，简称：DMRS)和数据之后，先根据估计得到的多普勒频偏进行频率补偿，再进行DMRS和数据的解调，以便提升DMRS和数据的解调性能，从而提高UE的下行平均吞吐量。
但是，在高铁移动通信网络中，由于UE的运动速度较高，UE根据CRS估计得到的多普勒频偏与网络中实际存在的多普勒频偏之间的误差将会越大，且由于UE的运动速度较高，网络中实际存在的多普勒频偏会越高，UE估计得到的多普勒频偏也会越高，但UE最大能够补偿的多普勒频偏有限，这样，便会导致DMRS和数据的解调性能不理想，从而导致无法更好得提高UE的下行平均吞吐量。
发明内容
本发明实施例提供一种数据传输设备、方法及系统，旨在更好 得提高UE的下行平均吞吐量。
为达到上述目的，本发明采用如下技术方案：
本发明的第一方面，提供一种接入网设备，应用于高速移动通信系统，如高铁移动通信系统，所述接入网设备包括：确定单元和发送单元；
所述确定单元，用于根据接收到的终端设备发送的上行信号确定下行频偏，并根据所述下行频偏和第一发射频率确定第二发射频率；
所述发送单元，用于基于所述确定单元确定出的所述第二发射频率向所述终端设备发送下行信号，以便所述终端设备基于与所述第一发射频率对应的接收频率接收所述下行信号；其中，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种。
结合第一方面，在一种可能的实现方式中，
所述发送单元，还用于在基于所述第二发射频率向所述终端设备发送下行信号之前，向所述终端设备发送指示信息；其中，所述指示信息用于指示所述接入网设备已进行频率补偿。
结合第一方面和上述可能的实现方式，在另一种可能的实现方式中，
所述发送单元，具体用于通过无线资源控制RRC连接重配消息向所述终端设备发送所述指示信息。
结合第一方面和上述可能的实现方式，在另一种可能的实现方式中，
所述发送单元，具体用于通过系统消息向所述终端设备发送所述指示信息。
结合第一方面和上述可能的实现方式，在另一种可能的实现方式中，
所述确定单元，具体用于根据所述上行信号，确定上行频偏，根据所述上行频偏确定所述下行频偏；
其中，所述上行频偏和所述下行频偏满足以下条件：
ΔfDL＝0.5*ΔfUL，其中，ΔfDL为所述下行频偏，ΔfUL为所述上行频偏。
结合第一方面和上述可能的实现方式，在另一种可能的实现方式中，
所述确定单元，还用于在根据所述上行信号，确定上行频偏之后，确定所述上行频偏大于第一预设阈值。
结合第一方面和上述可能的实现方式，在另一种可能的实现方式中，
所述确定单元，还用于在根据接收到的终端设备发送的上行信号确定下行频偏之前，确定所述终端设备的移动速度大于第二预设阈值。
本发明的第二方面，提供一种终端设备，应用于高速移动通信系统，如高铁移动通信系统，所述终端设备包括：接收单元和解调单元；
所述接收单元，用于基于接收频率接收下行信号；其中，所述接收频率与第一发射频率对应，所述下行信号是接入网设备基于第二发射频率发送至所述终端设备的，所述第二发射频率是根据下行频偏和所述第一发射频率确定的，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种；
所述解调单元，用于基于所述接收频率解调所述接收单元接收到的所述下行信号。
结合第二方面，在一种可能的实现方式中，
所述接收单元，还用于在基于接收频率接收下行信号之前，接收所述接入网设备发送的指示信息；所述指示信息用于指示所述接入网设备已进行频率补偿。
本发明的第三方面，提供一种数据传输方法，应用于高速移动通信系统，如高铁移动通信系统，该方法包括：
接入网设备根据接收到的终端设备发送的上行信号，确定下行频偏；
所述接入网设备根据所述下行频偏和第一发射频率确定第二发射频率；
所述接入网设备基于所述第二发射频率向所述终端设备发送下行信号，以便所述终端设备基于与所述第一发射频率对应的接收频率接收所述下行信号；其中，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种。
结合第三方面，在一种可能的实现方式中，在所述接入网设备基于所述第二发射频率向所述终端设备发送下行信号之前，所述方法还包括：
所述接入网设备向所述终端设备发送指示信息；其中，所述指示信息用于指示所述接入网设备已进行频率补偿。
结合第三方面和上述可能的实现方式，在另一种可能的实现方式中，所述接入网设备向所述终端设备发送指示信息，包括：
所述接入网设备通过无线资源控制RRC连接重配消息向所述终端设备发送所述指示信息。
结合第三方面和上述可能的实现方式，在另一种可能的实现方式中，所述接入网设备向所述终端设备发送指示信息，包括：
所述接入网设备通过系统消息向所述终端设备发送所述指示信息。
结合第三方面和上述可能的实现方式，在另一种可能的实现方式中，所述接入网设备根据接收到的终端设备发送的上行信号，确定下行频偏，包括：
所述接入网设备根据所述上行信号，确定上行频偏；
所述接入网设备根据所述上行频偏确定所述下行频偏；
其中，所述上行频偏和所述下行频偏满足以下条件：
ΔfDL＝0.5*ΔfUL，其中，ΔfDL为所述下行频偏，ΔfUL为所述上行频偏。
结合第三方面和上述可能的实现方式，在另一种可能的实现方式中，在所述接入网设备根据所述上行信号，确定上行频偏之后， 还包括：
所述接入网设备确定所述上行频偏大于第一预设阈值。
结合第三方面和上述可能的实现方式，在另一种可能的实现方式中，在所述接入网设备根据接收到的终端设备发送的上行信号确定下行频偏之前，所述方法还包括：
所述接入网设备确定所述终端设备的移动速度大于第二预设阈值。
本发明的第四方面，提供一种数据传输方法，应用于高速移动通信系统，如高铁移动通信系统，该方法包括：
终端设备基于接收频率接收下行信号；其中，所述接收频率与第一发射频率对应，所述下行信号是接入网设备基于第二发射频率发送至所述终端设备的，所述第二发射频率是根据下行频偏和所述第一发送频率确定的，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种；
所述终端设备基于所述接收频率解调所述下行信号。
结合第四方面，在一种可能的实现方式中，在所述终端设备基于接收频率接收下行信号之前，所述方法还包括：
所述终端设备接收所述接入网设备发送的指示信息；所述指示信息用于指示所述接入网设备已进行频率补偿。
本发明的第五方面，提供一种接入网设备，应用于高速移动通信系统，如高铁移动通信系统，所述接入网设备包括：处理器和发送器；
所述处理器，用于根据接收到的终端设备发送的上行信号确定下行频偏，并根据所述下行频偏和第一发射频率确定第二发射频率；
所述发送器，用于基于所述处理器确定出的所述第二发射频率向所述终端设备发送下行信号，以便所述终端设备基于与所述第一发射频率对应的接收频率接收所述下行信号；其中，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种。
结合第五方面，在一种可能的实现方式中，
所述发送器，还用于在基于所述第二发射频率向所述终端设备发送下行信号之前，向所述终端设备发送指示信息；其中，所述指示信息用于指示所述接入网设备已进行频率补偿。
结合第五方面和上述可能的实现方式，在另一种可能的实现方式中，
所述发送器，具体用于通过无线资源控制RRC连接重配消息向所述终端设备发送所述指示信息。
结合第五方面和上述可能的实现方式，在另一种可能的实现方式中，
所述发送器，具体用于通过系统消息向所述终端设备发送所述指示信息。
结合第五方面和上述可能的实现方式，在另一种可能的实现方式中，
所述处理器，具体用于根据所述上行信号，确定上行频偏，根据所述上行频偏确定所述下行频偏；
其中，所述上行频偏和所述下行频偏满足以下条件：
ΔfDL＝0.5*ΔfUL，其中，ΔfDL为所述下行频偏，ΔfUL为所述上行频偏。
结合第五方面和上述可能的实现方式，在另一种可能的实现方式中，
所述处理器，还用于在根据所述上行信号，确定上行频偏之后，确定所述上行频偏大于第一预设阈值。
结合第五方面和上述可能的实现方式，在另一种可能的实现方式中，
所述处理器，还用于在根据接收到的终端设备发送的上行信号确定下行频偏之前，确定所述终端设备的移动速度大于第二预设阈值。
本发明的第六方面，提供一种终端设备，应用于高速移动通信系统，如高铁移动通信系统，所述终端设备包括：接收器和处理器；
所述接收器，用于基于接收频率接收下行信号；其中，所述接收频率与第一发射频率对应，所述下行信号是接入网设备基于第二发射频率发送至所述终端设备的，所述第二发射频率是根据下行频偏和所述第一发射频率确定的，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种；
所述处理器，用于基于所述接收频率解调所述接收器接收到的所述下行信号。
结合第六方面，在一种可能的实现方式中，
所述接收器，还用于在基于接收频率接收下行信号之前，接收所述接入网设备发送的指示信息；所述指示信息用于指示所述接入网设备已进行频率补偿。
本发明的第七方面，提供一种数据传输系统，该数据传输系统包括接入网设备以及终端设备；
其中，所述接入网设备，用于根据接收到的终端设备发送的上行信号，确定下行频偏；根据所述下行频偏和第一发射频率确定第二发射频率；基于所述第二发射频率向所述终端设备发送下行信号，以便所述终端设备基于与所述第一发射频率对应的接收频率接收所述下行信号；其中，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种。
所述终端设备，用于基于接收频率接收下行信号，并基于所述接收频率解调所述下行信号，所述接收频率与第一发射频率对应。
本发明实施例提供的数据传输设备、方法及系统，接入网设备在确定出下行频偏之后，根据确定出的下行频偏和第一发射频率确定第二发射频率，以实现对第一发射频率的频率补偿，并基于第二发射频率向终端设备发送下行信号，由于接入网设备的性能优于终端设备的性能，也就是说，接入网设备估计的下行频偏与网络中实际存在的下行频偏之间的误差较小，且接入网设备可以补偿较高的下行频偏，因此，在接入网设备向终端设备发送下行信号之前，可以由接入网设备对下行频偏进行估计，并根据估计的下行频偏对第 一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向终端设备发送下行信号，这样，便可以使终端设备接收到的下行信号基本无频偏，使得终端设备可以直接基于与第一发射频率对应的接收频率接收下行信号，并基于该接收频率进行解调，提升了下行信号的解调性能，从而提高了终端设备的下行平均吞吐量。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明一实施例提供的一种接入网设备的组成示意图；
图2为本发明另一实施例提供的一种终端设备的组成示意图；
图3为本发明另一实施例提供的一种数据传输方法流程图；
图4为本发明另一实施例提供的一种数据传输方法流程图；
图5为本发明另一实施例提供的一种数据传输方法流程图；
图6为本发明另一实施例提供的另一种数据传输方法流程图；
图7为本发明另一实施例提供的另一种数据传输方法流程图；
图8为本发明另一实施例提供的另一种数据传输方法流程图；
图9为本发明另一实施例提供的另一种数据传输方法流程图；
图10为本发明另一实施例提供的一种接入网设备的组成示意图；
图11为本发明另一实施例提供的一种终端设备的组成示意图；
图12为本发明另一实施例提供的一种数据传输系统的架构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本 领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
另外，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
本发明实施例提供的数据传输方法，应用于高速移动通信系统，如高铁移动通信系统，该高铁移动通信系统包括接入网设备和终端设备，以接入网设备为基站，终端设备为UE为例，由于UE的高速运动，会导致高铁移动通信系统出现多普勒频移现象，也就是说，UE接收基站发送的下行信号(至少包括DMRS和数据中的一种)的接收频率与基站的发射频率之间会存在偏移，为了提高UE的下行平均吞吐量，UE在接收到基站发送的下行信号之后，首先要对接收频率进行频率补偿，再根据补偿后的接收频率进行下行信号的接收和解调，但是，由于UE的运动速度较高，高铁移动通信系统中实际存在的多普勒频偏会较大，UE的补偿能力有限，即UE无法补偿较高的多普勒频偏，这样，便会影响UE接收和解调基站发送的下行信号，从而导致无法更好得提高UE的下行平均吞吐量。采用本发明实施例提供的数据传输方法，在基站向UE发送下行信号之前，可以由基站对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向终端设备发送下行信号，这样，便可以使UE接收基站发送的下行信号的接收频率与基站的发射频率之间基本无偏移，使得UE可以直接基于与第一发射频率对应的接收频率接收并解调下行信号，从而更好得提高UE的下行平均吞吐量。
为了便于本领域技术人员的理解，本发明提供的技术方案具体的实施过程具体可以参考本发明提供的以下实施例。
本发明一实施例提供一种接入网设备，如图1所示，该接入网设备包括：确定单元11和发送单元12。
确定单元11，用于根据接收到的终端设备发送的上行信号确定下行频偏，并根据确定出的下行频偏和第一发射频率确定第二发射频率。
发送单元12，用于基于确定单元11确定出的第二发射频率向终端设备发送下行信号，以便终端设备基于与第一频率对应的接收频率接收下行信号；其中，下行信号至少包括解调参考信号DMRS和下行数据中的一种。
在本发明实施例中，进一步的，发送单元12，还用于在基于第二发射频率向终端设备发送下行信号之前，向终端设备发送指示信息。
其中，指示信息用于指示接入网设备已进行频率补偿。
在本发明实施例中，进一步的，发送单元12，具体用于通过无线资源控制(英文：Radio Resource Control，简称：RRC)连接重配消息向终端设备发送指示信息。
在本发明实施例中，进一步的，发送单元12，具体用于通过系统消息向终端设备发送指示信息。
在本发明实施例中，进一步的，确定单元11具体用于根据接收到的终端设备发送的上行信号，确定上行频偏，并根据估计出的上行频偏确定下行频偏。
其中，上行频偏和下行频偏满足以下条件：ΔfDL＝0.5*ΔfUL，其中，ΔfDL为下行频偏，ΔfUL为上行频偏。
在本发明实施例中，进一步的，针对移动通信系统采用公网部署的应用场景，确定单元11，还用于在根据上行信号，确定上行频偏之后，确定上行频偏大于第一预设阈值。
在本发明实施例中，进一步的，针对移动通信系统采用公网部署的应用场景，确定单元11，还用于在根据接收到的终端设备发送的上行信号确定下行频偏之前，确定终端设备的移动速度大于第二预设阈值。
本发明实施例提供的接入网设备，在确定出下行频偏之后，根 据确定出的下行频偏和第一发射频率确定第二发射频率，以实现对第一发射频率的频率补偿，并基于第二发射频率向终端设备发送下行信号，由于接入网设备的性能优于终端设备的性能，也就是说，接入网设备估计的下行频偏与网络中实际存在的下行频偏之间的误差较小，且接入网设备可以补偿较高的下行频偏，因此，在接入网设备向终端设备发送下行信号之前，可以由接入网设备对下行频偏进行估计，并根据估计的下行频偏对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向终端设备发送下行信号，这样，便可以使终端设备接收到的下行信号基本无频偏，使得终端设备可以直接基于与第一发射频率对应的接收频率接收下行信号，并基于该接收频率进行解调，提升了下行信号的解调性能，从而提高了终端设备的下行平均吞吐量。
本发明另一实施例提供一种终端设备，如图2所示，该终端设备可以包括：接收单元21和解调单元22。
接收单元21，用于基于接收频率接收下行信号；其中，所述接收频率与第一发射频率对应，所述下行信号是接入网设备基于第二发射频率发送至终端设备的，第二发射频率是根据下行频偏和第一发射频率确定的，下行信号至少包括DMRS和下行数据中的一种。
解调单元22，用于基于接收频率解调接收单元21接收到的下行信号。
在本发明实施例中，进一步的，接收单元21，还用于在基于接收频率接收下行信号之前，接收接入网设备发送的指示信息。
其中，指示信息用于指示接入网设备已进行频率补偿。
本发明实施例提供的终端设备，基于与第一发射频率对应的接收频率接收下行信号，该下行信号是接入网设备基于第二发射频率发送至终端设备的，第二发射频率是接入网设备根据下行频偏和第一发射频率确定的，并在接收到下行信号之后，便可以根据该接收频率解调该下行信号，由于接入网设备的性能优于终端设备的性能，也就是说，接入网设备估计的下行频偏与网络中实际存在的下行频 偏之间的误差较小，且接入网设备可以补偿较高的下行频偏，因此，在接入网设备向终端设备发送下行信号之前，可以由接入网设备对下行频偏进行估计，并根据估计的下行频偏对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向终端设备发送下行信号，这样，便可以使终端设备接收到的下行信号基本无频偏，使得终端设备可以直接基于与第一发射频率对应的接收频率接收下行信号，并基于该接收频率进行解调，提升了下行信号的解调性能，从而提高了终端设备的下行平均吞吐量。
本发明另一实施例提供的一种数据传输方法，如图3所示，该方法可以包括：
S301、接入网设备根据接收到的终端设备发送的上行信号，确定下行频偏。
S302、接入网设备根据下行频偏和第一发射频率确定第二发射频率。
其中，在接入网设备根据接收到的上行信号确定出下行频偏之后，可以根据下行频偏对第一发射频率进行频率补偿，以得到第二发射频率。
S303、接入网设备基于第二发射频率向终端设备发送下行信号，以便终端设备基于与第一发射频率对应的接收频率接收下行信号。
其中，所述的下行信号至少可以包括DMRS和下行数据中的一种。其中，与第一发射频率对应的接收频率指的是接收频率基本与第一发射频率之间无偏移，即接收频率与第一发射频率在数值上基本相等。
本发明实施例提供的数据传输方法，接入网设备在确定出下行频偏之后，根据确定出的下行频偏和第一发射频率确定第二发射频率，以实现对第一发射频率的频率补偿，并基于第二发射频率向终端设备发送下行信号，由于接入网设备的性能优于终端设备的性能，也就是说，接入网设备估计的下行频偏与网络中实际存在的下行频偏之间的误差较小，且接入网设备可以补偿较高的下行频偏，因此， 在接入网设备向终端设备发送下行信号之前，可以由接入网设备对下行频偏进行估计，并根据估计的下行频偏对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向终端设备发送下行信号，这样，便可以使终端设备接收到的下行信号基本无频偏，使得终端设备可以直接基于与第一发射频率对应的接收频率接收下行信号，并基于接收频率进行解调，提升了下行信号的解调性能，从而提高了终端设备的下行平均吞吐量。
进一步的，为了使终端设备可以获知接入网设备在发送下行信号之前已进行了频率补偿，在执行S303之前，接入网设备需向终端设备发送指示信息。
其中，指示信息用于指示接入网设备已进行频率补偿。
当然，指示信息还可以用于指示终端设备不需继续频率补偿，本发明实施例在此对指示信息的具体作用不做具体的限制。
进一步的，在一种可能的实现方式中，接入网设备向终端设备发送指示信息的过程具体的可以为：接入网设备通过RRC连接重配消息向终端设备发送指示信息。
进一步的，在另一种可能的实现方式中，接入网设备向终端设备发送指示信息的过程具体的可以为：接入网设备通过系统消息向终端设备发送指示信息。
进一步的，S301具体的为：接入网设备根据接收到的终端设备发送的上行信号，确定上行频偏，并根据确定的上行频偏确定下行频偏。
其中，上行频偏和下行频偏满足以下条件：ΔfDL＝0.5*ΔfUL，ΔfDL为下行频偏，ΔfUL为上行频偏。
进一步的，在一种可能的实现方式中，针对移动通信系统采用公网部署的应用场景，在接入网设备根据上行信号确定出上行频偏之后，可以确定上行频偏是否大于第一预设阈值，并在确定出上行频偏大于第一预设阈值时，执行根据上行频偏确定下行频偏。
进一步的，在另一种可能的实现方式中，针对移动通信系统采 用公网部署的应用场景，在执行S301之前，接入网设备需确定终端设备的移动速度是否大于第二预设阈值，并在确定出终端设备的移动速度大于第二预设阈值时，执行S301。
本发明另一实施例提供的一种数据传输方法，如图4所示，该方法可以包括：
S401、终端设备基于接收频率接收下行信号。
其中，所述的接收频率与第一发射频率对应。该下行信号是接入网设备基于第二发射频率发送至终端设备的，第二发射频率是接入网设备根据下行频偏和第一发送频率确定的，下行信号至少包括DMRS和下行数据中的一种。
S402、终端设备基于接收频率解调下行信号。
其中，在终端设备基于接收频率接收下行信号之后，便可以基于该接收频率解调该下行信号，以便在成功解调该下行信号之后，成功接收到该下行信号。
本发明实施例提供的数据传输方法，终端设备基于与第一发射频率对应的接收频率接收下行信号，该下行信号是接入网设备基于第二发射频率发送至终端设备的，第二发射频率是接入网设备根据下行频偏和第一发射频率确定的，并在接收到下行信号之后，便可以基于接收频率解调该下行信号，由于接入网设备的性能优于终端设备的性能，也就是说，接入网设备估计的下行频偏与网络中实际存在的下行频偏之间的误差较小，且接入网设备可以补偿较高的下行频偏，因此，在接入网设备向终端设备发送下行信号之前，可以由接入网设备对下行频偏进行估计，并根据估计的下行频偏对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向终端设备发送下行信号，这样，便可以使终端设备接收到的下行信号基本无频偏，使得终端设备可以直接基于与第一发射频率对应的接收频率接收下行信号，并基于该接收频率进行解调，提升了下行信号的解调性能，从而提高了终端设备的下行平均吞吐量。
进一步的，为了使终端设备可以获知接入网设备在发送下行信 号之前已进行了频率补偿，在执行S401之前，终端设备接收接入网设备发送的指示信息。
其中，指示信息用于指示接入网设备已进行频率补偿。
需要说明的是，本发明实施例中的终端设备可以为UE，也可以为中继(Relay)，可以根据实际应用场景的需求选择相应的终端设备，本发明实施例在此不做限制。
需要说明的是，本发明实施例仅以移动通信系统为LTE系统为例介绍，当然，本发明实施例也可以应用到其它移动通信系统中，本发明实施例在此不做限制。
本发明另一实施例提供一种数据传输方法，为了便于本领域技术人员的理解，在本发明实施例中，根据应用场景的不同，对本发明实施例提供的数据传输方法的具体实施过程进行详细描述，具体如下：
针对高铁移动通信网络采用射频拉远的方式进行网络部署的场景，此时接入网设备为由BBU和RRU组成的基站，终端设备为UE，在该应用场景下的数据传输方法如图5所示，具体的该方法可以包括：
S501、BBU根据接收到的UE发送的上行信号，确定下行频偏。
其中，具体的，S501可以包括S5011-S5012：
S5011、BBU根据接收到的UE发送的上行信号，确定上行频偏。
其中，BBU可以根据接收到的上行信号确定上行频偏，以实现对上行链路的频偏的估计。
S5012、BBU根据上行频偏确定下行频偏。
其中，在BBU根据接收到的UE发送的上行信号确定出上行频偏之后，BBU便可以根据确定得到的上行频偏确定下行频偏。
其中，上行频偏和下行频偏满足以下条件：为ΔfDL＝0.5*ΔfUL，ΔfDL为下行频偏，ΔfUL为上行频偏。示例性的，若BBU确定出的上行频偏为1200Hz，则BBU根据上行频偏确定出的下行频偏为600Hz。
S502、RRU根据下行频偏和第一发射频率确定第二发射频率。
其中，RRU可以根据计算得到的下行频偏对第一发射频率进行频率补偿以得到第二发射频率。该第一发射频率是RRU根据预设的与UE进行数据传输所采用的频点对应的频率。
S503、RRU向UE发送指示信息。
其中，指示信息用于指示RRU已进行频率补偿。该指示信息的比特数可以为1，通常可以使用“1”表示RRU已进行频率补偿，使用“0”表示RRU未进行频率补偿。
可选的，RRU可以通过RRC连接重配消息向UE发送指示信息，也可以通过系统消息向UE发送指示信息。
需要说明的是，接入网设备可以先执行S501-S502，再执行S503，也可以先执行S503，再执行S501-S502(也就是说，在UE接入高铁移动通信网络之后，RRU便可以向UE发送指示信息，以使UE获知RRU对承载下行信号的第一发射频率进行了频率补偿)，本发明实施例在此对S501-S502和S503的执行顺序不做限制，可以根据实际应用场景的不同进行相应的选择。
S504、RRU基于第二发射频率向UE发送下行信号，以便UE基于与第一发射频率对应的接收频率接收下行信号。
其中，所述的下行信号至少可以包括DMRS和下行数据中的一种。在RRU根据确定出的下行频偏对第一发射频率进行频率补偿，得到第二发射频率之后，RRU便可以基于第二发射频率向UE发送下行信号。在一种可能的实现方式中，第二发射频率等于第一发射频率与下行频偏的差值。
S505、UE接收RRU发送的指示信息。
S506、UE基于接收频率接收下行信号。
其中，接收频率与第一发射频率对应。根据S501-S504可知，下行信号是RRU基于第二发射频率发送至UE的，第二发射频率是RRU根据下行频偏和第一发送频率确定的，下行信号至少可以包括DMRS和下行数据中的一种。
S507、UE基于接收频率解调下行信号。
其中，在UE接收到RRU发送的指示信息之后，UE便可以获知RRU在发送下行信号之前，已进行频率补偿，这样，UE便可以根据接收下行信号的接收频率(该接收频率与第一发射频率对应)，也就是说，UE可以基于接收频率直接接收和解调下行信号，不再需要根据CRS估计得到下行频偏之后，再根据估计的下行频偏进行下行信号的信道估计及解调。
本发明实施例提供的数据传输方法，在BBU根据接收到的UE发送的上行信号确定出下行频偏之后，RRU便可以根据确定出的下行频偏，对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向UE发送下行信号，由于RRU在发送下行信号之前，对第一发射频率进行了补偿，这样，便可以使UE接收到的下行信号基本无频偏，使得UE可以直接基于与第一发射频率对应的接收频率接收并解调下行信号，提升了下行信号的解调性能，从而提高了UE的下行平均吞吐量。
针对高铁移动通信网络采用独立基站进行网络部署的场景，此时接入网设备为eNodeB，终端设备为UE，在该应用场景下的数据传输方法如图6所示，具体的该方法可以包括：
S601、eNodeB根据接收到的UE发送的上行信号，确定下行频偏。
其中，具体的，S601可以包括S6011-S6012：
S6011、eNodeB根据接收到的UE发送的上行信号，确定上行频偏。
S6012、eNodeB根据上行频偏确定下行频偏。
S602、eNodeB根据下行频偏和第一发射频率确定第二发射频率。
S603、eNodeB向UE发送指示信息。
其中，指示信息用于指示eNodeB已进行频率补偿。
S604、eNodeB基于第二发射频率向UE发送下行信号，以便 UE基于与第一发射频率对应的接收频率接收下行信号。
S605、UE接收eNodeB发送的指示信息。
S606、UE基于接收频率接收下行信号。
其中，接收频率与第一发射频率对应。
S607、UE基于接收频率解调下行信号。
需要说明的是，本发明实施例中的S601-S607中的具体描述可以参照S501-S507中的具体描述，本发明实施例在此不再赘述。
本发明实施例提供的数据传输方法，在eNodeB根据接收到的UE发送的上行信号确定出下行频偏之后，eNodeB便可以根据确定出的下行频偏，对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向UE发送下行信号，由于eNodeB在发送下行信号之前，对第一发射频率进行了补偿，这样，便可以使UE接收到的下行信号基本无频偏，使得UE可以直接基于与第一发射频率对应的接收频率接收并解调下行信号，提升了下行信号的解调性能，从而提高了UE的下行平均吞吐量。
针对公网(非高铁移动通信网络)场景，此时接入网设备为eNodeB，终端设备为UE，在该应用场景下的数据传输方法如图7所示，具体的该方法可以包括：
S701、eNodeB确定UE的移动速度大于第二预设阈值。
示例性的，第二预设阈值可以为300km/h，eNodeB可以采用定位的方式获得UE的移动速度，如eNodeB在当前时刻定位UE所处的位置1，在间隔预定时间段之后再次定位UE所处的位置2，然后根据位置2与位置1之间的距离，以及预定时间段，便可以得到UE的移动速度。当eNodeB确定UE的移动速度不大于第二预设阈值时，eNodeB可以采用现有技术提供的方案与UE进行数据传输。当然，eNodeB也可以通过判断UE的切换频率或UE进行小区重选的频率，来确定UE的移动速度，本发明在此不做限制。当然，对于移动速度等于第二预设阈值的情况，可以采用本发明提供的数据传输方法与UE进行数据传输，也可以采用现有技术提供的方案与UE进行数 据传输，具体的方法可以根据实际应用场景的需求进行选择，本发明实施例在此不做具体限制。
需要说明的是，当接入网设备为由BBU和RRU组成的基站时，由BBU来判断UE的移动速度是否大于第二预设阈值，BBU具体获得UE的移动速度的过程可以参照eNodeB获得UE的移动速度的过程，本处不再赘述。
S702、eNodeB根据接收到的UE发送的上行信号，确定下行频偏。
其中，具体的，S702可以包括S7021-S7022：
S7021、eNodeB根据接收到的UE发送的上行信号，确定上行频偏。
S7022、eNodeB根据上行频偏确定下行频偏。
S703、eNodeB根据下行频偏和第一发射频率确定第二发射频率。
S704、eNodeB向UE发送指示信息。
其中，指示信息用于指示eNodeB已进行频率补偿。
S705、eNodeB基于第二发射频率向UE发送下行信号，以便UE基于与第一发射频率对应的接收频率接收下行信号。
S706、UE接收eNodeB发送的指示信息。
S707、UE基于接收频率接收下行信号。
其中，接收频率与第一发射频率对应。
S708、UE基于接收频率解调下行信号。
需要说明的是，本发明实施例中的S702-S708中的具体描述可以参照S501-S507中的具体描述，本发明实施例在此不再赘述。
需要说明的是，本发明实施例中的S701-S708仅是以接入网设备为eNodeB为例介绍，当然当接入网设备为由BBU和RRU组成的基站时，由BBU和RRU组成的基站与UE之间的数据传输方法可以参照本发明实施例中的S701-S708中的描述，本发明实施例在此不再赘述。
当然，eNodeB也可以通过判断S7021中确定的上行频偏是否大于第一预设阈值来确定是否采用本发明提供的数据传输方法，也就是说，在S7021之后，若eNodeB确定出上行频偏大于第一预设阈值，则采用本发明提供的数据传输方法与UE进行数据传输，若eNodeB确定出上行频偏小于第一预设阈值，则采用现有技术提供的方案与UE进行数据传输。当然，对于上行频偏等于第一预设阈值的情况，可以采用本发明提供的数据传输方法与UE进行数据传输，也可以采用现有技术提供的方案与UE进行数据传输，具体的方法可以根据实际应用场景的需求进行选择，本发明实施例在此不做具体限制。
本发明实施例提供的数据传输方法，在eNodeB确定UE的移动速度大于预设阈值之后，eNodeB可以根据接收到的UE发送的上行信号确定出下行频偏，并根据确定出的下行频偏，对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向UE发送下行信号，由于eNodeB在发送下行信号之前，对第一发射频率进行了补偿，这样，便可以使UE接收到的下行信号基本无频偏，使得UE可以直接基于与第一发射频率对应的接收频率接收并解调下行信号，提升了下行信号的解调性能，从而提高了UE的下行平均吞吐量。
针对高铁上安装中继(Repeater)的场景，此时接入网设备为eNodeB或由BBU和RRU组成的基站，终端设备为UE，以接入网设备为eNodeB为例介绍，在该应用场景下的数据传输方法如图8所示，具体的该方法可以包括：
S801、eNodeB根据接收到的UE发送的上行信号，确定下行频偏。
其中，具体的，S801可以包括S8011-S8012：
S8011、eNodeB根据接收到的UE发送的上行信号，确定上行频偏。
S8012、eNodeB根据上行频偏确定下行频偏。
S802、eNodeB根据下行频偏和第一发射频率确定第二发射频率。
S803、eNodeB通过中继(Repeater)向UE发送指示信息。
其中，指示信息用于指示eNodeB已进行频率补偿。
S804、eNodeB基于第二发射频率通过中继(Repeater)向UE发送下行信号，以便UE基于与第一发射频率对应的接收频率接收下行信号。
其中，在Repeater接收到eNodeB基于第二发射频率发送的下行信号之后，Repeater对接收到的下行信号的功率进行放大，再将功率放大后的下行信号发送至UE。
S805、UE接收eNodeB通过中继(Repeater)发送的指示信息。
S806、UE基于接收频率接收eNodeB通过中继(Repeater)发送的下行信号。
其中，接收频率与第一发射频率对应。
S807、UE基于接收频率解调下行信号。
需要说明的是，本发明实施例中的S801-S807中的具体描述可以参照S501-S507中的具体描述，本发明实施例在此不再赘述。
需要说明的是，本发明实施例中的S801-S807仅是以接入网设备为eNodeB为例介绍，当然当接入网设备为由BBU和RRU组成的基站时，由BBU和RRU组成的基站与UE之间的数据传输方法可以参照本发明实施例中的S801-S807中的描述，本发明实施例在此不再赘述。
本发明实施例提供的数据传输方法，在eNodeB根据接收到的UE发送的上行信号确定出下行频偏之后，eNodeB便可以根据确定出的下行频偏，对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率通过Repeater向UE发送下行信号，由于eNodeB在发送下行信号之前，对第一发射频率进行了补偿，这样，便可以使UE接收到的下行信号基本无频偏，使得UE可以直接基于与第一发射频率对应的接收频率接收并解调，提升了下行信号的解 调性能，从而提高了UE的下行平均吞吐量。
针对高铁上安装中继(Relay)的场景，此时接入网设备为eNodeB或由BBU和RRU组成的基站，终端设备为Relay，以接入网设备为eNodeB为例介绍，在该应用场景下的数据传输方法如图9所示，具体的该方法可以包括：
S901、eNodeB根据接收到的Relay发送的上行信号，确定下行频偏。
其中，具体的，S901可以包括S9011-S9012：
S9011、eNodeB根据接收到的Relay发送的上行信号，确定上行频偏。
S9012、eNodeB根据上行频偏确定下行频偏。
S902、eNodeB根据下行频偏和第一发射频率确定第二发射频率。
S903、eNodeB向Relay发送指示信息。
其中，指示信息用于指示eNodeB已进行频率补偿。
S904、eNodeB基于第二发射频率向Relay下行信号，以便UE基于与第一发射频率对应的接收频率接收下行信号。
S905、Relay接收eNodeB发送的指示信息。
S906、Relay基于接收频率接收下行信号。
其中，接收频率与第一发射频率对应。
S907、Relay基于接收频率解调下行信号。
其中，在Relay基于接收频率解调下行信号之后，对其覆盖下的UE进行独立调度，即Relay根据自身与UE之间的链路质量，重新生成下行信号，并将下行信号发送给UE。
需要说明的是，本发明实施例中的S901-S907中的具体描述可以参照S501-S507中的具体描述，本发明实施例在此不再赘述。
需要说明的是，本发明实施例中的S901-S907仅是以接入网设备为eNodeB为例介绍，当然当接入网设备为由BBU和RRU组成的基站时，由BBU和RRU组成的基站与UE之间的数据传输方法可以 参照本发明实施例中的S901-S907中的描述，本发明实施例在此不再赘述。
本发明实施例提供的数据传输方法，在eNodeB根据接收到的Relay发送的上行信号确定出下行频偏之后，eNodeB便可以根据确定出的下行频偏对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向Relay发送下行信号，由于eNodeB在发送下行信号之前，对第一发射频率进行了补偿，这样，便可以使Relay接收到的下行信号基本无频偏，使得Relay可以基于与第一发射频率对应的接收频率接收并解调下行信号，提升了下行信号的解调性能，从而提高了Relay的下行平均吞吐量。
并且，在Relay的下行平均吞吐量提高的基础之上，由于Relay可以重新调度自身覆盖下的UE，且Relay与UE之间无相对移动，因此，采用本发明实施例提供的技术方案提高了UE的下行平均吞吐量。
本发明另一实施例提供一种接入网设备，如图10所示，该接入网设备可以包括：处理器1001和发送器1002。
处理器1001，用于根据接收到的终端设备发送的上行信号确定下行频偏，并根据所述下行频偏和第一发射频率确定第二发射频率。
发送器1002，用于基于所述处理器1001确定出的所述第二发射频率向所述终端设备发送下行信号，以便所述终端设备基于所述第一发射频率对应的接收频率接收所述下行信号；其中，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种。
在本发明实施例中，进一步的，发送器1002，还用于在在基于所述第二发射频率向所述终端设备发送下行信号之前，向所述终端设备发送指示信息；其中，所述指示信息用于指示所述接入网设备已进行频率补偿。
在本发明实施例中，进一步的，发送器1002，具体用于通过无线资源控制RRC连接重配消息向所述终端设备发送所述指示信息。
在本发明实施例中，进一步的，发送器1002，具体用于通过系 统消息向所述终端设备发送所述指示信息。
在本发明实施例中，进一步的，处理器1001，具体用于根据所述上行信号，确定上行频偏；根据所述上行频偏确定所述下行频偏；
其中，所述上行频偏和所述下行频偏满足以下条件：
ΔfDL＝0.5*ΔfUL，其中，ΔfDL为所述下行频偏，ΔfUL为所述上行频偏。
在本发明实施例中，进一步的，所述处理器1001，还用于在根据所述上行信号，确定上行频偏之后，确定所述上行频偏大于第一预设阈值。
在本发明实施例中，进一步的，处理器1001，还用于在根据接收到的终端设备发送的上行信号确定下行频偏之前，确定所述终端设备的移动速度大于第二预设阈值。
本发明实施例提供的接入网设备，在确定出下行频偏之后，根据确定出的下行频偏和第一发射频率确定第二发射频率，以实现对第一发射频率的频率补偿，并基于第二发射频率向终端设备发送下行信号，由于接入网设备的性能优于终端设备的性能，也就是说，接入网设备估计的下行频偏与网络中实际存在的下行频偏之间的误差较小，且接入网设备可以补偿较高的下行频偏，因此，在接入网设备向终端设备发送下行信号之前，可以由接入网设备对下行频偏进行估计，并根据估计的下行频偏对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向终端设备发送下行信号，这样，便可以使终端设备接收到的下行信号基本无频偏，使得终端设备可以直接基于与第一发射频率对应的接收频率接收下行信号，并基于该接收频率进行解调，提升了下行信号的解调性能，从而提高了终端设备的下行平均吞吐量。
本发明另一实施例提供一种终端设备，如图11所示，该终端设备可以包括：接收器1101和处理器1102。
接收器1101，用于基于接收频率接收下行信号；其中，所述接收频率与第一发射频率对应，所述下行信号是接入网设备基于第二 发射频率发送至所述终端设备的，所述第二发射频率是所述接入网设备根据下行频偏和所述第一发射频率确定的，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种。
处理器1102，用于基于所述接收频率解调所述接收器1101接收到的所述下行信号。
在本发明实施例中，进一步的，接收器1101，还用于在基于接收频率接收下行信号之前，接收所述接入网设备发送的指示信息；所述指示信息用于指示所述接入网设备已进行频率补偿。
本发明实施例提供的终端设备，基于与第一发射频率对应的接收频率接收下行信号，该下行信号是接入网设备基于第二发射频率发送至终端设备的，第二发射频率是接入网设备根据下行频偏和第一发射频率确定的，并在接收到下行信号之后，便可以基于接收频率解调该下行信号，由于接入网设备的性能优于终端设备的性能，也就是说，接入网设备估计的下行频偏与网络中实际存在的下行频偏之间的误差较小，且接入网设备可以补偿较高的下行频偏，因此，在接入网设备向终端设备发送下行信号之前，可以由接入网设备对下行频偏进行估计，并根据估计的下行频偏对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向终端设备发送下行信号，这样，便可以使终端设备接收到的下行信号基本无频偏，使得终端设备可以直接基于与第一发射频率对应的接收频率接收下行信号，并基于该接收频率进行解调，提升了下行信号的解调性能，从而提高了终端设备的下行平均吞吐量。
本发明另一实施例提供一种数据传输系统，如图12所示，该系统包括：接入网设备1201和终端设备1202。
其中，接入网设备1201，用于根据接收到的终端设备1202发送的上行信号，确定下行频偏；根据所述下行频偏和第一发射频率确定第二发射频率；基于所述第二发射频率向所述终端设备发送下行信号，以便所述终端设备1202基于与所述第一发射频率对应的接收频率接收所述下行信号；其中，所述下行信号至少包括解调参考 信号DMRS和下行数据中的一种。
终端设备1202，用于基于接收频率接收下行信号，并基于所述接收频率解调所述下行信号，所述接收频率与第一发射频率对应。
本发明实施例提供的数据传输系统，接入网设备在确定出下行频偏之后，根据确定出的下行频偏和第一发射频率确定第二发射频率，以实现对第一发射频率的频率补偿，并基于第二发射频率向终端设备发送下行信号，由于接入网设备的性能优于终端设备的性能，也就是说，接入网设备估计的下行频偏与网络中实际存在的下行频偏之间的误差较小，且接入网设备可以补偿较高的下行频偏，因此，在接入网设备向终端设备发送下行信号之前，可以由接入网设备对下行频偏进行估计，并根据估计的下行频偏对第一发射频率进行频率补偿得到第二发射频率，并基于第二发射频率向终端设备发送下行信号，这样，便可以使终端设备接收到的下行信号基本无频偏，使得终端设备可以直接基于与第一发射频率对应的接收频率接收下行信号，并基于该接收频率进行解调，提升了下行信号的解调性能，从而提高了终端设备的下行平均吞吐量。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。上述描述的装置的具体工作过程，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，所揭露的装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述模块或单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个装置，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接， 可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是一个物理单元或多个物理单元，即可以位于一个地方，或者也可以分布到多个不同地方。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该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个设备(可以是单片机，芯片等)或处理器(processor)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(英文：Read-Only Memory，简称：ROM)、随机存取存储器(英文：Random Access Memory，简称：RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应所述以权利要求的保护范围为准。

Claims (19)

  1. 一种接入网设备，其特征在于，所述接入网设备包括：确定单元和发送单元；
    所述确定单元，用于根据接收到的终端设备发送的上行信号确定下行频偏，并根据所述下行频偏和第一发射频率确定第二发射频率；
    所述发送单元，用于基于所述确定单元确定出的所述第二发射频率向所述终端设备发送下行信号，以便所述终端设备基于与所述第一发射频率对应的接收频率接收所述下行信号；其中，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种。
  2. 根据权利要求1所述的接入网设备，其特征在于，
    所述发送单元，还用于在基于所述第二发射频率向所述终端设备发送下行信号之前，向所述终端设备发送指示信息；其中，所述指示信息用于指示所述接入网设备已进行频率补偿。
  3. 根据权利要求2所述的接入网设备，其特征在于，
    所述发送单元，具体用于通过无线资源控制RRC连接重配消息向所述终端设备发送所述指示信息。
  4. 根据权利要求2所述的接入网设备，其特征在于，
    所述发送单元，具体用于通过系统消息向所述终端设备发送所述指示信息。
  5. 根据权利要求1-4中任一项所述的接入网设备，其特征在于，
    所述确定单元，具体用于根据所述上行信号，确定上行频偏，根据所述上行频偏确定所述下行频偏；其中，所述上行频偏和所述下行频偏满足以下条件：
    ΔfDL＝0.5*ΔfUL，其中，ΔfDL为所述下行频偏，ΔfUL为所述上行频偏。
  6. 根据权利要求5所述的接入网设备，其特征在于，
    所述确定单元，还用于在根据所述上行信号，确定上行频偏之后，确定所述上行频偏大于第一预设阈值。
  7. 根据权利要求1-6中任一项所述的接入网设备，其特征在于，
    所述确定单元，还用于在根据接收到的终端设备发送的上行信号确定下行频偏之前，确定所述终端设备的移动速度大于第二预设阈值。
  8. 一种终端设备，其特征在于，所述终端设备包括：接收单元和解调单元；
    所述接收单元，用于基于接收频率接收下行信号；其中，所述接收频率与第一发射频率对应，所述下行信号是接入网设备基于第二发射频率发送至所述终端设备的，所述第二发射频率是根据下行频偏和所述第一发射频率确定的，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种；
    所述解调单元，用于基于所述接收频率解调所述接收单元接收到的所述下行信号。
  9. 根据权利要求8所述的终端设备，其特征在于，
    所述接收单元，还用于在基于接收频率接收下行信号之前，接收所述接入网设备发送的指示信息；所述指示信息用于指示所述接入网设备已进行频率补偿。
  10. 一种数据传输方法，其特征在于，包括：
    接入网设备根据接收到的终端设备发送的上行信号，确定下行频偏；
    所述接入网设备根据所述下行频偏和第一发射频率确定第二发射频率；
    所述接入网设备基于所述第二发射频率向所述终端设备发送下行信号，以便所述终端设备基于与所述第一发射频率对应的接收频率接收所述下行信号；其中，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种。
  11. 根据权利要求10所述的方法，其特征在于，在所述接入网设备基于所述第二发射频率向所述终端设备发送下行信号之前，所述方法还包括：
    所述接入网设备向所述终端设备发送指示信息；其中，所述指示 信息用于指示所述接入网设备已进行频率补偿。
  12. 根据权利要求11所述的方法，其特征在于，所述接入网设备向所述终端设备发送指示信息，包括：
    所述接入网设备通过无线资源控制RRC连接重配消息向所述终端设备发送所述指示信息。
  13. 根据权利要求11所述的方法，其特征在于，所述接入网设备向所述终端设备发送指示信息，包括：
    所述接入网设备通过系统消息向所述终端设备发送所述指示信息。
  14. 根据权利要求10-13中任一项所述的方法，其特征在于，所述接入网设备根据接收到的终端设备发送的上行信号，确定下行频偏，包括：
    所述接入网设备根据所述上行信号，确定上行频偏；
    所述接入网设备根据所述上行频偏确定所述下行频偏；其中，所述上行频偏和所述下行频偏满足以下条件：
    ΔfDL＝0.5*ΔfUL，其中，ΔfDL为所述下行频偏，ΔfUL为所述上行频偏。
  15. 根据权利要求14所述的方法，其特征在于，在所述接入网设备根据所述上行信号，确定上行频偏之后，还包括：
    所述接入网设备确定所述上行频偏大于第一预设阈值。
  16. 根据权利要求10-15中任一项所述的方法，其特征在于，在所述接入网设备根据接收到的终端设备发送的上行信号确定下行频偏之前，所述方法还包括：
    所述接入网设备确定所述终端设备的移动速度大于第二预设阈值。
  17. 一种数据传输方法，其特征在于，包括：
    终端设备基于接收频率接收下行信号；其中，所述接收频率与第一发射频率对应，所述下行信号是接入网设备基于第二发射频率发送至所述终端设备的，所述第二发射频率是根据下行频偏和所述第一发 送频率确定的，所述下行信号至少包括解调参考信号DMRS和下行数据中的一种；
    所述终端设备基于所述接收频率解调所述下行信号。
  18. 根据权利要求17所述的方法，其特征在于，在所述终端设备基于接收频率接收下行信号之前，所述方法还包括：
    所述终端设备接收所述接入网设备发送的指示信息；所述指示信息用于指示所述接入网设备已进行频率补偿。
  19. 一种数据传输系统，其特征在于，包括：
    如权利要求1-7中任一项所述的接入网设备；
    以及如权利要求8或9所述的终端设备。
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