WO2014180265A1 - Procédé, dispositif, système et support de stockage informatique pour transmettre un signal de référence de liaison descendante - Google Patents

Procédé, dispositif, système et support de stockage informatique pour transmettre un signal de référence de liaison descendante Download PDF

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Publication number
WO2014180265A1
WO2014180265A1 PCT/CN2014/076366 CN2014076366W WO2014180265A1 WO 2014180265 A1 WO2014180265 A1 WO 2014180265A1 CN 2014076366 W CN2014076366 W CN 2014076366W WO 2014180265 A1 WO2014180265 A1 WO 2014180265A1
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Prior art keywords
reference signal
subframe
downlink reference
subframes
carrier
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PCT/CN2014/076366
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English (en)
Chinese (zh)
Inventor
苟伟
韩晓钢
左志松
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中兴通讯股份有限公司
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Publication of WO2014180265A1 publication Critical patent/WO2014180265A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0082—Timing of allocation at predetermined intervals
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26136—Pilot sequence conveying additional information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex

Definitions

  • the present invention relates to Long Term Evolution (LTE) technology, and in particular, to a downlink reference signal transmission method, device, system and computer storage medium.
  • LTE Long Term Evolution
  • the LTE system can provide a maximum spectrum bandwidth of 20MHz.
  • the LTE 20 system as an evolution system of the LTE system, can provide spectrum bandwidth of up to 100 MHz and support more flexible and higher quality communication, while the LTE 20 system has good backward compatibility.
  • the LTE 20 terminal with strong capability can transmit data on multiple component carriers (CCs) at the same time.
  • This technology is called multi-carrier aggregation technology.
  • Multi-carrier aggregation technology can achieve the purpose of increasing bandwidth.
  • an LTE terminal can only work on a backward compatible CC, that is, an LTE terminal can only transmit data on one CC.
  • the LTE 20 terminal refers to: a terminal having an LTE 20 module, that is, a terminal having an LTE 20 version.
  • the base station subordinates up to 5 CCs, and the 5 CCs are carriers with backward compatibility to support the operation of the user equipment (UE, User Equipment) of the original LTE version.
  • the base station can configure multiple CCs for one UE, and select one of the configured multiple CCs.
  • the partial or all CCs are activated for the UE, and the activated CC can provide data transmission for the UE.
  • the LTE 11 phase puts forward new requirements for spectrum resource utilization, network energy conservation, and interference suppression between cells.
  • a new carrier (New Carrier Type) technology is proposed.
  • the New Carrier Type technology is applied by means of carrier aggregation technology.
  • New Carrier Type A distinctive feature of the New Carrier Type technology is that it does not need to consider backwards in design. Compatibility, more new technologies can be applied in New Carrier Type technology.
  • the definition of New Carrier Type in LTE 12 is as follows: At least one compatible carrier pairing application is required, and LTE 8 Cell-specific Reference Signals (CRS) are not configured in the New Carrier Type to avoid The neighboring cell has severe CRS interference at the cell edge, especially the CRS interference between the macro cell and the micro cell in the heterogeneous network (HetNet, Heterogeneous Network) scenario.
  • HetNet Heterogeneous Network
  • the CRS without LTE 8 in the New Carrier Type will face the problem that the reference signal that cannot be used for synchronization tracking in the New Carrier Type can be used. Summary of the invention
  • Embodiments of the present invention provide a downlink reference signal transmission method, device, system, and computer storage medium, which can implement downlink reference signal transmission in a New Carrier Type.
  • An embodiment of the present invention provides a method for transmitting a downlink reference signal, where the method includes: determining, by the network side, a transmission bandwidth of a subframe pattern and a downlink reference signal that are sent by the downlink reference signal according to a system bandwidth of the carrier;
  • the network side sends the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
  • the network side determines, according to a system bandwidth of the carrier, a transmission bandwidth of the downlink frame signal and the downlink reference signal, including:
  • the network side determines that the subframe pattern is distributed according to a 5 ms period, and determines that the transmission bandwidth is M PRB pairs; or
  • the network side determines that the subframe pattern is distributed according to a 5 ms period, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or ,
  • the network side determines the subframe pattern as subframes #0, #1, #5, and #6 in the radio frame, or is a subframe in the radio frame. 1, #2, #6, and #7, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame And determining a PRB pair corresponding to a system bandwidth in which the transmission bandwidth is a carrier; or
  • the network side determines the subframe pattern as subframes #0, #4 in the radio frame. #5 ⁇ #9;
  • the network side determines the subframe pattern as a subframe in the radio frame. 0, #1, #5, and #6, and determine the PRB pair corresponding to the system bandwidth of the carrier; or
  • the network side determines that the subframe pattern is distributed according to a 2 ms period, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier.
  • the value of M is 25, and the value of N is 6.
  • the network side preferentially selects the sub-frame pattern.
  • the frames are all subframe patterns of the downlink subframe as the determined subframe pattern.
  • the downlink subframe includes a special subframe in a TDD mode.
  • the network side determines the subframe pattern as subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame. , or for subframes #2, #3 in the radio frame, #7 ⁇ #8, or subframes #3, #4, #8, and #9 in the radio frame, and when the network side needs to select the only-seed frame pattern to use, the preferred side of the network side
  • the frame pattern is: Subframes #0, #1, #5, and #6 in the radio frame.
  • the determining the transmission bandwidth is M PRB pairs, which is:
  • the determining the subframe pattern is distributed according to a 5 ms period, and is:
  • subframe pattern Determining the subframe pattern as subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or in the radio frame Subframes #3 and #8, or subframes #4 and #9 in the radio frame.
  • the network side when determining that the subframe pattern is subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or Is the subframes #3 and #8 in the radio frame, or the subframes #4 and #9 in the radio frame, and when the network side needs to select the only-seed frame pattern to use, the network side is preferred
  • the sub-frame pattern is: Subframes #0 and #5.
  • the method further includes: configuring, by the network side, system information block (MIB) information or other high layer signaling other than the MIB information to indicate receiving The indication information of the subframe pattern sent by the downlink reference signal in the terminal carrier is sent out.
  • MIB system information block
  • the downlink reference signal is a synchronous tracking reference signal or a synchronization reference signal used for synchronous tracking of the receiving end and the carrier, or a cell-specific reference signal (CRS) of port 0 specified by the LTE R8 standard, or LTE
  • CRS cell-specific reference signal
  • CSI-RS channel state indication reference signal
  • DM S common demodulation reference signal
  • RRM radio resource management
  • the method before the sending the downlink reference signal, the method further includes:
  • the network side generates a sequence of the downlink reference signal as a sequence of the downlink reference signal sent in the PRB pair corresponding to the determined transmission bandwidth, according to the system bandwidth of the current carrier supported by the LTE system; or
  • the network side generates a sequence of the downlink reference signal according to the determined transmission bandwidth, and is a sequence of the downlink reference signal sent by the PRB pair corresponding to the determined transmission bandwidth.
  • the method when the downlink reference signal is sent, the method further includes:
  • the network side sends a subframe offset parameter for indicating a location of the starting subframe of the downlink reference signal in the radio frame.
  • the subframe offset parameter ranges from 0, 1, 2, 3, and 4;
  • the subframe offset parameter takes a value range of 0, 1.
  • the subframe offset parameter takes a value range. It is 0, 1, 2, 3.
  • the embodiment of the present invention further provides a method for receiving a downlink reference signal, where the method includes: the receiving end determines, according to a system bandwidth of the carrier, a transmission bandwidth of a subframe pattern and a downlink reference signal that are sent by the downlink reference signal;
  • the receiving end receives the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
  • the receiving end determines the transmission bandwidth of the subframe pattern and the downlink reference signal that are sent by the downlink reference signal according to the system bandwidth of the carrier, including:
  • the receiving end determines that the subframe pattern is distributed according to a 5 ms period, and determines that the transmission bandwidth is M PRB pairs;
  • the receiving end determines that the subframe pattern is distributed according to a 5 ms period, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or ,
  • the receiving end determines that the subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or is a subframe in the radio frame. 1, #2, #6, and #7, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame And determining a PRB pair corresponding to a system bandwidth in which the transmission bandwidth is a carrier; or
  • the receiving end determines that the subframe pattern is subframes #0, #4, #5, and #9 in the radio frame; when the carrier When the system bandwidth is equal to N PRB pairs, and in the TDD mode, the receiving end determines that the subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, and determines a system in which the transmission bandwidth is a carrier.
  • the PRB pair corresponding to the bandwidth; or,
  • the receiving end determines that the subframe pattern is distributed according to a 2 ms period, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier.
  • the receiving end and the network side pre-arrange the preference.
  • the subframes in the frame pattern are all subframe patterns of the downlink subframe as the determined subframe pattern.
  • the receiving end determines that the subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame. , or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame, and when the receiving end and the network side
  • the preferred subframe pattern of the receiving end is: subframes #0, #1, #5, and #6.
  • the subframe pattern is determined to be subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or Subframes #3 and #8 in the radio frame, or subframes #4 and #9 in the radio frame, and when the receiving end and the network side pre-arrange the need to select the only-seed frame pattern to be used,
  • the preferred subframe pattern at the receiving end is: Subframes #0 and #5.
  • the method further includes: the receiving end is configured according to the received MIB information or other high-layer signaling other than the MIB information, to indicate that the receiving end carrier
  • the indication information of the subframe pattern sent by the downlink reference signal determines a subframe pattern used for transmitting the downlink reference signal.
  • the sequence of the received downlink reference signal is: generating a sequence of the downlink reference signal according to a maximum bandwidth supported by the LTE system, and determining the determined transmission bandwidth from the generated sequence of the downlink reference signal a sequence of the corresponding downlink reference signal corresponding to the PRB pair; or a sequence of the downlink reference signal generated according to a system bandwidth of a current carrier supported by the LTE system; or the downlink generated according to the determined transmission bandwidth
  • the sequence of reference signals is: generating a sequence of the downlink reference signal according to a maximum bandwidth supported by the LTE system, and determining the determined transmission bandwidth from the generated sequence of the downlink reference signal a sequence of the corresponding downlink reference signal corresponding to the PRB pair; or a sequence of the downlink reference signal generated according to a system bandwidth of a current carrier supported by the LTE system; or the downlink generated according to the determined transmission bandwidth
  • the sequence of reference signals is: generating a sequence of the downlink reference signal according to a maximum bandwidth supported by the LTE system, and
  • the method further includes:
  • the receiving end determines, according to the received subframe offset parameter, a starting subframe position of the received downlink reference signal in the radio frame.
  • the embodiment of the present invention further provides a sending device for a downlink reference signal, where the sending device includes: a first determining module and a sending module;
  • the first determining module is configured to determine, according to a system bandwidth of the carrier, a transmission bandwidth of the subframe pattern and the downlink reference signal sent by the downlink reference signal, and send the determined subframe pattern and the determined transmission bandwidth to the sending module 32.
  • the sending module is configured to receive the determined subframe pattern sent by the first determining module And after determining the transmission bandwidth, transmitting the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
  • the sending module is further configured to generate a sequence of the downlink reference signal according to a maximum system bandwidth supported by the LTE system before transmitting the downlink reference signal; and from the generated sequence of the downlink reference signal And a sequence of the downlink reference signal sent by the PRB pair corresponding to the determined transmission bandwidth, as a sequence of the downlink reference signal sent in the PRB pair corresponding to the determined transmission bandwidth; or, according to the LTE system Generating a sequence of the downlink reference signal as a sequence of the downlink reference signal sent in the PRB pair corresponding to the determined transmission bandwidth; or generating the foregoing according to the determined transmission bandwidth a sequence of the downlink reference signal as a sequence of the downlink reference signal sent in the PRB pair corresponding to the determined transmission bandwidth; and/or configured to send the downlink reference signal for indicating transmission in the radio frame The subframe offset parameter of the starting subframe position.
  • the embodiment of the present invention further provides a receiving device for a downlink reference signal, where the receiving device includes: a second determining module and a receiving module;
  • the second determining module is configured to determine, according to a system bandwidth of the carrier, a transmission bandwidth of the subframe pattern and the downlink reference signal sent by the downlink reference signal, and send the determined subframe pattern and the determined transmission bandwidth to the receiving module;
  • the receiving module is configured to receive the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern after receiving the determined subframe pattern and the determined transmission bandwidth sent by the second determining module.
  • the receiving module is further configured to determine, according to the received subframe subframe offset parameter, a starting subframe position of the received downlink reference signal in a radio frame.
  • An embodiment of the present invention further provides a transmission system for transmitting a downlink reference signal, where the system includes: a sending device and a receiving device;
  • the sending device is configured to determine, according to a system bandwidth of the carrier, a downlink reference signal sent a transmission bandwidth of the subframe pattern and the downlink reference signal; transmitting the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern;
  • the receiving device is configured to determine, according to a system bandwidth of the carrier, a transmission bandwidth of the subframe pattern and the downlink reference signal that are sent by the downlink reference signal, and receive the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
  • the embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the method for transmitting the downlink reference signal according to the embodiment of the invention.
  • the embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the method for receiving the downlink reference signal according to the embodiment of the invention.
  • the network side determines the transmission bandwidth of the subframe pattern and the downlink reference signal sent by the downlink reference signal according to the system bandwidth of the carrier; Determining, by the receiving end, the downlink reference signal in the determined transmission bandwidth; correspondingly, the receiving end determines, according to the system bandwidth of the carrier, a transmission bandwidth of the subframe pattern and the downlink reference signal that are sent by the downlink reference signal;
  • the determined subframe pattern receives the downlink reference signal in the determined transmission bandwidth, thus implementing transmission of the downlink reference signal in the New Carrier Type.
  • the solution provided by the embodiment of the present invention is applicable to the transmission of the synchronization tracking reference signal, and is particularly suitable for the transmission of the synchronization tracking reference signal of the communication system in which the system bandwidth of multiple carriers exists. That is to say, the downlink reference signal transmitted by the method of the embodiment of the present invention can be used for synchronization tracking, and performance can be guaranteed.
  • the solution provided by the embodiment of the present invention weakens the interference generated by the existing LTE 8 CS in the HetNet scenario to a certain extent, and also enables the UE to use the downlink reference signal.
  • FIG. 1 is a schematic flowchart of a method for transmitting a downlink reference signal according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a method for receiving a downlink reference signal according to an embodiment of the present invention
  • FIGS. 3a-3d are diagrams for transmitting by using the method of the embodiment of the present invention
  • the performance curve of the downlink reference signal for synchronous tracking simulation when the system bandwidth of the carrier is 6 PRB pairs;
  • FIG. 4 is a schematic structural diagram of a device for transmitting a downlink reference signal according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a device for receiving a downlink reference signal according to an embodiment of the present invention.
  • FIG. 1 is a schematic flowchart of a method for transmitting a downlink reference signal according to an embodiment of the present invention; as shown in FIG. 1, the method includes the following steps:
  • Step 101 The network side determines a transmission bandwidth of the subframe pattern and the downlink reference signal sent by the downlink reference signal according to the system bandwidth of the carrier.
  • the network side refers to a network side device, preferably a base station.
  • the specific implementation of this step includes:
  • the network side determines that the subframe pattern is distributed according to a 5 ms period, and determines that the transmission bandwidth is M PRB pairs;
  • the network side determines that the subframe pattern is distributed according to a 5 ms period, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or ,
  • the network side determines the subframe pattern as subframes #0, #1, #5, and #6 in the radio frame, or is a subframe in the radio frame. 1, #2, #6, and #7, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame And determining a PRB pair corresponding to a system bandwidth in which the transmission bandwidth is a carrier; or
  • the network side determines the subframe pattern as subframes #0, #4, #5, and #9 in the radio frame; when the carrier system When the bandwidth is equal to N PRB pairs, and in the TDD mode, the network side determines the subframe pattern as subframes #0, #1, #5, and #6 in the radio frame, and determines the system bandwidth of the transmission bandwidth as the carrier. Corresponding PRB pair; or,
  • the network side determines that the subframe pattern is distributed according to a 2 ms period, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier.
  • the values of M and N are 25 and 6, respectively.
  • the subframe in the radio frame since the subframe in the radio frame also has an uplink subframe, when determining that the subframe pattern is the subframes #0, #1, #5, and #6 in the radio frame, or Subframes #1, #2, #6, and #7 in the radio frame, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, # in the radio frame 4.
  • #8 and #9 the subframes in the subframe pattern are all selected as the subframe pattern of the downlink subframe as the determined subframe pattern.
  • the network side determines the subframe pattern as subframes #0, #1, #5, and #6 in the radio frame, or is a subframe in the radio frame. 1, #2, #6, and #7, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame
  • the basis is:
  • the determined subframe pattern captures two consecutive subframes, and two consecutive subframes are equally spaced, and two consecutive subframes are advantageous for synchronous tracking; specifically, in two consecutive subframes, the signal The time deviation and frequency deviation that can be generated are very limited. Therefore, the averaging can be performed when the downlink reference signals in two consecutive subframes are used for synchronous tracking, so that the performance of the synchronization tracking can be improved, which is especially suitable for the high-speed movement of the receiving end. Synchronous tracking.
  • all four subframes in the subframe pattern may be configured as paging subframes, and regardless of whether the LTE system is in TDD mode or FDD mode, Frames #0 and #5 are used to carry system information and PSS/SSS, which The subframes do not carry the multicast physical channel (PMCH), so the subframe carrying the downlink reference signal does not collide with the subframe carrying the PMCH.
  • PMCH multicast physical channel
  • the network side determines the subframe pattern as subframes #0, #1, #5, and #6 in the radio frame, or is the subframe #1 in the radio frame. #2, #6, and #7, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame,
  • the preferred subframe pattern is: subframes #0, #1, #5, and #6.
  • the network side determines the subframe pattern as subframes #0, #4, #5, and #9 in the radio frame; when in the TDD mode, The basis of the network side determining the subframe pattern as the subframes #0, #1, #5, and #6 in the radio frame is:
  • the subframes in the determined subframe pattern are all potential paging subframes, and the PMCH is not carried. Therefore, the subframe carrying the downlink reference signal does not collide with the subframe carrying the PMCH, thereby ensuring the downlink reference.
  • the signal is normally transmitted in the mixed broadcast carrier of the multimedia broadcast multicast service (MBMS) service and the unicast service in the sub-frame time division multiplexing, and the subframe carrying the downlink reference signal is not associated with the multicast single frequency network (MBSFN). Frame conflict.
  • MBMS multimedia broadcast multicast service
  • MBSFN multicast single frequency network
  • the PRB pair refers to a PRB pair that is defined by a PRB pair in LTE 36.211; further, the PRB pair includes a PRB composed of all downlink orthogonal frequency division multiplexing (OFDM) symbols in a special subframe of the TDD mode. Correct.
  • OFDM orthogonal frequency division multiplexing
  • the determining the transmission bandwidth is M PRB pairs, specifically:
  • the determining the subframe pattern is distributed according to a 5 ms period, specifically:
  • subframe pattern Determining the subframe pattern as subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or in the radio frame Subframes #3 and #8, or subframes #4 and #9 in the radio frame.
  • the determining the subframe pattern is the subframes #0 and #5 in the radio frame, or in the radio frame.
  • the preferred subframe pattern is: subframes #0 and #5.
  • subframes #1, #2, #3, #4, #5, #6, #7, #8, and #9 are numbers of subframes in a radio frame, specifically, subframe #1 refers to wireless.
  • the method may further include:
  • the network side configured, in the MIB information or other high-layer signaling other than the MIB information, indication information for indicating a subframe pattern that is sent by the downlink reference signal in the receiving end carrier, and sends the indication information, so that the receiving end is configured according to the subframe.
  • the pattern information determines the specific sub-frame pattern used.
  • the other higher layer signaling may be a system information block (SIBx).
  • the downlink reference signal may be a synchronous tracking reference signal or a synchronization reference signal used for synchronous tracking of the receiving end and the carrier.
  • 3a-3d are performance curves of the downlink tracking signal transmitted by the method of the embodiment of the present invention when the system bandwidth of the carrier is 6 PRB pairs.
  • FIG. 3a - FIG. 3d show that the system bandwidth of the simulated carrier is equal to 6 PRB pairs, respectively, the sub-frame pattern is distributed according to the lms period, distributed according to the 5 ms period, and the subframes #0, #1, #5, and #6 And sub-frames #0, #4, #5, and #9, the tracking performance curve of the transmitted synchronization tracking reference signal; as can be seen from FIG. 3a - FIG.
  • the downlink reference transmitted by the method of the embodiment of the present invention Signal, tracking performance can be guaranteed.
  • the use of the sub-frame pattern as the tracking performance curve of the synchronous tracking reference signal transmitted according to the lms period distribution is a technical solution adopted by the prior art; when performing the simulation, the enhanced typical urban (ETU) channel ( The signal-to-noise ratio (SNR) of channel ) is -8 db, and the receiving end is UE; in Figure 3a - 3d, the thick solid line indicates the tracking performance curve corresponding to the sub-frame pattern according to the lms period distribution, and the thick two-dot chain line indicates the sub-line
  • the frame pattern distributes the corresponding tracking performance curve according to the 5ms period; the thin solid line indicates the subframe pattern
  • the tracking performance curves corresponding to subframes #0, #1, #5, and #6, and the thin dotted lines indicate that the subframe pattern is the tracking performance curve corresponding to subframes #0, #4, #5, and #9;
  • the downlink reference signal may also be a CRS of port 0 specified by the LTE R8 standard.
  • the downlink reference signal may also be a CSI-RS or a common DM S transmitted in a common port mapping in the LTE system; here, the embodiment of the present invention also applies the performance of the existing CSI-RS and DM S to the synchronization tracking.
  • the simulation experiment is performed, and a certain gain is also obtained, so the downlink reference signal is a CSI-RS transmitted in the common port mapping in the LTE system.
  • the common port refers to a port that can be received by all the receiving ends in the cell.
  • the CSI-RS sent by the common port mapping in the LTE system is a cell-specific CSI-RS, that is, in the current LTE system. UE-specific CSI-RS.
  • the downlink reference signal may also be a DM S that is sent according to a common precoding mapping in the LTE system, that is, the downlink reference signal is a common DM S 0 , where the common precoding refers to all receiving ends in the cell.
  • Pre-coding that can be learned that is, UE-specific DMRS in the current LTE system.
  • the downlink reference signal can also be used for RRM measurements.
  • Step 102 The network side sends the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
  • the method may further include: the network side generating a sequence of the downlink reference signal according to a maximum system bandwidth supported by the LTE system;
  • sequence of the downlink reference signal corresponding to the determined transmission bandwidth is intercepted from the sequence of the downlink reference signal that is generated, and the downlink reference is sent in the PRB pair corresponding to the determined transmission bandwidth.
  • the network side generates a sequence of the downlink reference signal according to the system bandwidth of the current carrier supported by the LTE system, and sends the sequence as the PRB pair corresponding to the determined transmission bandwidth.
  • a sequence of line reference signals or,
  • the network side generates a sequence of the downlink reference signal according to the determined transmission bandwidth, and is a sequence of the downlink reference signal sent by the PRB pair corresponding to the determined transmission bandwidth.
  • the sequence of the downlink reference signal is calculated as follows: First, the value of Cimt is calculated by using formula (1), and the formula (1) is used in the calculation.
  • 3 ⁇ 4 The parameters of the new carrier are used; here, if the new carrier does not have its own independent virtual cell identifier (ID, IDentity), the physical cell ID of the compatible carrier paired with the new carrier is used.
  • ID independent virtual cell identifier
  • N CP 2 10 -( -(3 ⁇ 4 + l) + + l)-(2.N- u + l) + 2.
  • the c (i) sequence is further calculated by using c imt .
  • N ⁇ T D L takes the determined transmission bandwidth.
  • the network side After determining the sequence r( ) of the downlink reference signal sent in the PRB pair corresponding to the determined transmission bandwidth, the network side is in the subframe determined by the determined subframe pattern according to the LTE specified mapping pattern. Map in the send bandwidth.
  • the method may further include:
  • a subframe offset parameter which is used to indicate the location of the start subframe of the downlink reference signal in the radio frame, where the subframe offset parameter is used to describe that the downlink reference signal is The starting subframe position within the radio frame.
  • the subframe offset parameter ranges from 0, 1, 2, 3, and 4;
  • the subframe offset parameter takes a value range of 0, 1.
  • the subframe offset parameter takes a value range. It is 0, 1, 2, 3.
  • the embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used in the method for transmitting a downlink reference signal according to the embodiment of the present invention.
  • the embodiment of the invention further provides a method for receiving a downlink reference signal.
  • 2 is a schematic flowchart of a method for receiving a downlink reference signal according to an embodiment of the present invention; as shown in FIG. 2, the method includes the following steps:
  • Step 201 The receiving end determines a transmission bandwidth of the subframe pattern and the downlink reference signal sent by the downlink reference signal according to the system bandwidth of the carrier.
  • the receiving end may be a UE or a small cell.
  • the specific implementation of this step includes:
  • the receiving end determines that the subframe pattern is distributed according to a 5 ms period, and determines that the transmission bandwidth is M PRB pairs;
  • the receiving end determines that the subframe pattern is distributed according to a 5 ms period, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or , When the system bandwidth of the carrier is equal to N PRB pairs, the receiving end determines that the subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or is a subframe in the radio frame.
  • the receiving end determines that the subframe pattern is subframes #0, #4, #5, and #9 in the radio frame; when the carrier system When the bandwidth is equal to N PRB pairs, and in the TDD mode, the receiving end determines the subframe pattern as subframes #0, #1, #5, and #6 in the radio frame, and determines the system bandwidth of the transmission bandwidth as the carrier. Corresponding PRB pair; or,
  • the receiving end determines that the subframe pattern is distributed according to a 2 ms period, and determines that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier.
  • the values of M and N are 25 and 6, respectively.
  • the subframe in the radio frame also has an uplink subframe
  • the subframe pattern is the subframes #0, #1, #5, and #6 in the radio frame, or is a radio frame
  • #8 and #9 the receiving end and the network side pre-arrange the subframes in the preferentially selected subframe pattern to be the subframe pattern of the downlink subframe as the determined subframe pattern.
  • the receiving end determines that the subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or is subframe #1 in the radio frame. #2, #6, and #7, or subframes #2, #3, #7, and #8 in the radio frame, or the basis of subframes #3, #4, #8, and #9 in the radio frame For:
  • the determined subframe pattern captures two consecutive subframes, and two consecutive subframes are equally spaced, and two consecutive subframes are advantageous for synchronous tracking; specifically, in two consecutive subframes, the signal
  • the time deviation and frequency deviation that can be generated are very limited, so use
  • the downlink reference signals in two consecutive subframes can be averaged when performing synchronous tracking, so that the performance of the synchronization tracking can be improved, which is particularly suitable for synchronous tracking under high-speed movement of the receiving end.
  • all four subframes in the subframe pattern may be configured as paging subframes, and regardless of whether the LTE system is in TDD mode or FDD mode.
  • Subframes #0 and #5 are both used to carry system information and PSS/SSS. These subframes do not carry the PMCH, so the subframe carrying the downlink reference signal does not collide with the subframe carrying the PMCH.
  • the receiving end determines that the subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or is subframe #1 in the radio frame. #2, #6, and #7, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame, And when the receiving end and the network side pre-arrange that a single type of subframe pattern needs to be selected for use, the preferred subframe pattern is: subframes #0, #1, #5, and #6.
  • the receiving end determines that the subframe pattern is subframes #0, #4, #5, and #9 in the radio frame; when in the TDD mode, The receiving end determines that the subframe pattern is the subframes #0, #1, #5, and #6 in the radio frame according to the following:
  • the subframes in the determined subframe pattern are all potential paging subframes, and the PMCH is not carried. Therefore, the subframe carrying the downlink reference signal does not collide with the subframe carrying the PMCH, thereby ensuring the downlink reference.
  • the signal is normally transmitted in the mixed carrier of the MBMS service and the unicast service in the time division multiplexing of the subframe, and the subframe carrying the downlink reference signal does not collide with the MBSFN subframe.
  • the PRB pair refers to a PRB pair that conforms to the PRB pair defined in LTE 36.211; further, the PRB pair includes a PRB pair composed of all downlink OFDM symbols in a special subframe of the TDD mode.
  • the determining the transmission bandwidth is M PRB pairs, specifically:
  • the determining the subframe pattern is distributed according to a 5 ms period, specifically: Determining the subframe pattern as subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or in the radio frame Subframes #3 and #8, or subframes #4 and #9 in the radio frame.
  • the subframe pattern is determined to be subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or wireless
  • the subframes #3 and #8 in the frame are the subframes #4 and #9 in the radio frame
  • the preferred subframe pattern is: Subframes #0 and #5.
  • subframes #1, #2, #3, #4, #5, #6, #7, #8, and #9 are numbers of subframes in a radio frame, specifically, subframe #1 refers to wireless.
  • the method may further include:
  • the receiving end determines, according to the received MIB information or other high-layer signaling other than the MIB information, indication information for indicating a subframe pattern that is sent by the downlink reference signal in the receiving end carrier, and determines to send the downlink reference signal.
  • the other higher layer signaling may be SIBx.
  • the downlink reference signal may be a synchronous tracking reference signal or a synchronization reference signal for synchronous tracking of the receiving end and the carrier.
  • the downlink reference signal may also be a CRS of port 0 specified by the LTE R8 standard.
  • the downlink reference signal may also be a common DMRS; here, the embodiment of the present invention also performs simulation experiments on the performance of the existing CSI-RS and DM S for synchronization tracking, and also obtains a certain gain, so
  • the downlink reference signal is a CSI-RS transmitted in a common port mapping in an LTE system.
  • the common port refers to a port that can be received by all the receiving ends in the cell.
  • the CSI-RS transmitted in the common port mapping in the LTE system is a cell-specific CSI-RS, that is, in the current LTE system.
  • UE-specific CSI-RS is a cell-specific CSI-RS, that is, in the current LTE system.
  • the row reference signal is a DM S transmitted in accordance with a common precoding mapping in the LTE system, that is, the downlink reference signal is a common DM S.
  • the common precoding refers to precoding that can be learned by all receiving ends in the cell, that is, the DM S unique to the UE in the current LTE system.
  • the downlink reference signal can also be used for RRM measurements.
  • the receiving end can learn the system bandwidth of the carrier by using the prior art.
  • Step 202 The receiving end receives the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
  • the sequence of the received downlink reference signal is: generating a sequence of the downlink reference signal according to a maximum bandwidth supported by the LTE system, and corresponding to the determined transmission bandwidth that is intercepted from the generated sequence of the downlink reference signal a sequence of the downlink reference signal corresponding to the PRB pair; or a sequence of the downlink reference signal generated according to a system bandwidth of a current carrier supported by the LTE system; or a downlink reference signal generated according to the determined transmission bandwidth sequence.
  • the method may further include:
  • Determining, by the receiving end, the starting subframe position of the received downlink reference signal in the radio frame according to the received subframe offset parameter, where the subframe offset parameter is used to describe that the downlink reference signal is in a wireless manner The starting subframe position within the frame.
  • the subframe offset parameter ranges from 0, 1, 2, 3, and 4;
  • the subframe offset parameter takes a value range of 0, 1.
  • the subframe offset parameter takes a value range. It is 0, 1, 2, 3.
  • the specific value of the subframe offset parameter in the actual application process is a conventional technical means of those skilled in the art, and details are not described herein again.
  • the receiving end needs to know the system bandwidth information of the carrier of the neighboring cell to determine the downlink reference signal of the neighboring cell.
  • Subframe pattern The embodiments of the present invention provide the following two implementation modes:
  • the system bandwidth information of the carrier of the neighboring cell is increased in the high layer signaling, such as the handover command or the measurement command, and the receiving end can obtain the system bandwidth information of the carrier of the neighboring cell through the high layer signaling.
  • the receiving end After the receiving end synchronizes with the neighboring cell, that is, after receiving the PSS/SSS, the receiving end further receives the MIB information of the neighboring cell, so as to obtain the system bandwidth information of the carrier of the neighboring cell.
  • the MIB information includes system bandwidth information of a carrier of a neighboring cell.
  • the embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the method for receiving the downlink reference signal according to the embodiment of the invention.
  • the receiving end is a UE
  • the downlink reference signals are synchronous tracking reference signals.
  • the system bandwidth of the carrier is 10 MHz, and for the LTE system, it corresponds to 50 PRB pairs; the values of M and N are 25 and 6, respectively.
  • the network side and the UE have pre-agreed to determine the subframe pattern sent by the synchronization tracking reference signal according to the system bandwidth of the carrier, and agree to use the only-seed frame pattern, and the preferred subframe pattern is the subframes #0 and #5. .
  • the number of PRB pairs corresponding to the system bandwidth of the carrier is greater than 25. Therefore, the network side determines that the subframe pattern sent by the synchronization tracking reference signal is distributed according to a 5 ms period; It has been pre-agreed and used - the seed frame pattern, and the preferred subframe pattern is the subframes #0 and #5. Therefore, the network side determines that the subframe pattern transmitted by the synchronization tracking reference signal is the subframes #0 and #5; The network side determines a continuous 25 PRB pairs in the middle of 50 PRB pairs whose transmission bandwidth is the carrier's system bandwidth. After determining the subframe pattern and the transmission bandwidth, the network side finally transmits the synchronization tracking reference signal in 25 consecutive PRB pairs in the middle of the subframes #0 and #5 in the radio frame.
  • the network side Before the synchronization tracking reference signal is sent, the network side first generates a sequence of synchronization tracking reference signals according to the maximum 20 MHz system bandwidth supported by the LTE system, and then performs interception to obtain 25 consecutive PRB pairs in the system bandwidth of the carrier.
  • the PRB pairs the sequence of the corresponding synchronization tracking reference signals, and then transmits the sequence of the obtained synchronization tracking reference signals in the corresponding 25 consecutive PRB pairs in the corresponding subframes #0 and #5 in the radio frame.
  • 20MHz corresponds to 100 PRB pairs
  • 25 consecutive PRB pairs transmitting synchronous tracking reference signals are also 25 PRB pairs corresponding to 20 PRB pairs corresponding to 20 MHz.
  • the system bandwidth of the carrier is 50 PRB pairs, and the number of PRB pairs corresponding to the system bandwidth of the carrier is greater than 25. Therefore, the UE determines that the synchronization tracking reference signal transmission period is 5 ms; With a sub-frame pattern, the preferred subframe patterns are subframes #0 and #5, therefore, the UE determines that the subframe pattern transmitted by the synchronization tracking reference signal is subframes #0 and #5; and, the UE determines the transmission bandwidth. A continuous 25 PRB pairs in the middle of 50 PRB pairs for the carrier's system bandwidth. After determining the subframe pattern and the transmission bandwidth, the UE finally receives the synchronization tracking reference signal in 25 consecutive PRB pairs in the middle of subframes #0 and #5 in the radio frame.
  • the network side and the UE pre-arrange the synchronization tracking reference signal to transmit and receive in the determined PRB pair according to the CRS port 0 of the LTE 8; in other words, the determined side of the network side In the subframe corresponding to the frame pattern, the synchronization tracking reference signal is sent in the determined PRB through the port 0 of the CRS specified by the LTE R8; correspondingly, the UE passes the CRS specified by the port 0 LTE R8 in the subframe corresponding to the determined subframe pattern.
  • Port 0 receives the synchronization tracking reference signal in the determined PRB pair.
  • the UE considers the synchronization tracking received
  • the sequence of reference signals generates a sequence of synchronization tracking reference signals according to a system bandwidth of up to 20 MHz supported by the LTE system, and considers that the sequence of the synchronization tracking reference signals of the 25 PRB pairs of the transmission bandwidth is corresponding to the sequence of the generated synchronization tracking reference signals.
  • the system bandwidth of the carrier is 1.4 MHz, and for the LTE system, it corresponds to 6 PRB pairs; M and N respectively take values 25 and 6.
  • the network side and the UE have previously determined the subframe pattern transmitted by the synchronization tracking reference signal according to the system bandwidth of the carrier, and agree to use only one type of subframe pattern, and the preferred subframe pattern is subframe #0, #1. #5 and #6.
  • the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6. Therefore, the network side determines that the subframe pattern transmitted by the synchronization tracking reference signal is subframes #0, #1, #5, and #6; The side determines the system bandwidth in which the transmission bandwidth is the carrier, that is, 6 PRB pairs. After determining the subframe pattern and the transmission bandwidth, the network side finally transmits the synchronization tracking reference signal in all six PRB pairs of subframes #0, #1, #5, and #6 in the radio frame.
  • the network side Before the synchronization tracking reference signal is sent, the network side first generates a sequence of the synchronization tracking reference signal according to the maximum 20 MHz system bandwidth supported by the LTE system, and then performs interception to obtain a sequence of the corresponding synchronous tracking reference signals of the six consecutive PRB pairs.
  • the sequence of the obtained synchronization tracking reference signals is then transmitted in the corresponding 6 PRB pairs of #0, #1, #5, and #6 in the radio frame.
  • 20 MHz corresponds to 100 PRB pairs
  • 6 PRB pairs that send synchronous tracking reference signals are also 6 PRB pairs in the middle of 100 PRB pairs corresponding to 20 MHz.
  • the system bandwidth of the carrier is 6 PRB pairs, and the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6. Therefore, the UE determines that the subframe pattern of the synchronization tracking reference signal is subframes #0, #1. #5 ⁇ #6; And, the UE determines 6 PRB pairs whose transmission bandwidth is the system bandwidth of the carrier. After determining the subframe pattern and the transmission bandwidth, the UE finally receives the synchronization tracking reference signal in all six consecutive PRB pairs of subframes #0, #1, #5, and #6 in the radio frame.
  • the network side and the UE pre-arrange the synchronization tracking reference signal to transmit and receive in the determined PRB pair according to the CRS port 0 of the LTE 8; in other words, the determined side of the network side In the subframe corresponding to the frame pattern, the synchronization tracking reference signal is sent in the determined PRB through the port 0 of the CRS specified by the LTE R8; correspondingly, the UE passes the CRS specified by the port 0 LTE R8 in the subframe corresponding to the determined subframe pattern.
  • Port 0 receives the synchronization tracking reference signal in the determined PRB pair.
  • the UE considers that the received sequence of the synchronization tracking reference signal generates a sequence of synchronization tracking reference signals according to the system bandwidth of 20 MHz supported by the LTE system, and considers that the sequence of the synchronization tracking reference signals of the six PRB pairs of the transmission bandwidth is from A sequence of synchronized tracking reference signals corresponding to the intercepted six PRB pairs in the sequence of generated synchronization tracking reference signals.
  • the system bandwidth of the carrier is 1.4 MHz and is FDD mode, and for the LTE system, it corresponds to 6 PRB pairs; M and N respectively take values 25 and 6.
  • the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6, and is added to the FDD mode. Therefore, the network side determines that the subframe pattern transmitted by the synchronization tracking reference signal is subframes #0, #4, #5, and # 9; and, the network side determines the system bandwidth in which the transmission bandwidth is a carrier, that is, 6 PRB pairs. After determining the subframe pattern and the transmission bandwidth, the network side finally transmits the synchronization tracking reference signal in all six PRB pairs of subframes #0, #4, #5, and #9 in the radio frame.
  • the network side Before the synchronization tracking reference signal is sent, the network side first generates a sequence of the synchronization tracking reference signal according to the maximum 20 MHz system bandwidth supported by the LTE system, and then performs interception to obtain a sequence of the corresponding synchronous tracking reference signals of the six consecutive PRB pairs.
  • the sequence of the obtained synchronization tracking reference signals is then transmitted in the corresponding 6 PRB pairs of #0, #1, #5, and #6 in the radio frame.
  • 20 MHz corresponds to 100 PRB pairs.
  • the 6 PRB pairs that send the synchronization tracking reference signal are also 6 consecutive PRB pairs in the middle of 100 PRB pairs corresponding to 20 MHz.
  • the system bandwidth of the carrier is 6 PRB pairs and is in the FDD mode, and the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6. Therefore, the UE determines that the subframe pattern of the synchronization tracking reference signal is #0, # 4. #5 ⁇ #9; and, the UE determines 6 PRB pairs whose transmission bandwidth is the system bandwidth of the carrier. After determining the subframe pattern and the transmission bandwidth, the UE finally receives the synchronization tracking reference signal in all six consecutive PRB pairs of subframes #0, #4, #5, and #9 in the radio frame.
  • the network side and the UE pre-arrange the synchronization tracking reference signal to transmit and receive in the determined PRB pair according to the CRS port 0 of the LTE 8; in other words, the determined side of the network side In the subframe corresponding to the frame pattern, the synchronization tracking reference signal is sent in the determined PRB through the port 0 of the CRS specified by the LTE R8; correspondingly, the UE passes the CRS specified by the port 0 LTE R8 in the subframe corresponding to the determined subframe pattern.
  • Port 0 receives the synchronization tracking reference signal in the determined PRB pair.
  • the UE considers that the received sequence of the synchronization tracking reference signal generates a sequence of synchronization tracking reference signals according to the system bandwidth of 20 MHz supported by the LTE system, and considers that the sequence of the synchronization tracking reference signals of the six PRB pairs of the transmission bandwidth is from A sequence of synchronized tracking reference signals corresponding to the intercepted six PRB pairs in the sequence of generated synchronization tracking reference signals.
  • the system bandwidth of the carrier is 1.4 MHz, and for the LTE system, it corresponds to 6 PRB pairs; M and N respectively take values 25 and 6.
  • the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6. Therefore, the network side selects a reasonable subframe pattern of the synchronous tracking reference signal according to the unicast service and/or the multicast service scheduling requirement in the carrier. It is assumed that the subframes #1, #2, #6, and #7 are determined; and, the network side determines the system bandwidth in which the transmission bandwidth is the carrier, that is, 6 PRB pairs. After determining the subframe pattern and the transmission bandwidth, the network side finally transmits the synchronization tracking reference signal in all six PRB pairs of subframes #1, #2, #6, and #7 in the radio frame.
  • the network side configures, in the MIB information, an indication message indicating that the subframe pattern of the synchronization tracking reference signal transmission in the UE carrier is subframes #1, #2, #6, and #7.
  • the configured indication information may adopt the manner in which the network side and the UE agree to the number; for example, the subframe pattern transmitted by the synchronization tracking reference signal may be agreed as the subframe #0, # 1.
  • the number of #5 and #6 is 1, the subframe pattern sent by the synchronous tracking reference signal is the number of subframes #L # 2 , #6, and #7, and the subframe pattern sent by the synchronous tracking reference signal is sub Frame # 2 , #3, #7, and #8 are numbered 3, and the sub-frame pattern transmitted by the synchronization tracking reference signal is the number of subframes #3, #4, #8, and #9, which is 4, when the synchronization tracking reference is determined. If the subframe pattern of the signal transmission is subframes #1, #2, #6, and #7, the subframe pattern that the synchronization tracking reference signal is transmitted may be corresponding to the subframes #1, #2, #6, and #7. The number 2 is sent to the UE. Correspondingly, after receiving the 2, the UE can know that the subframe pattern sent by the synchronization tracking reference signal is subframes #1, #2, #6, and #7.
  • the network side Before the synchronization tracking reference signal is sent, the network side first generates a sequence of the synchronization tracking reference signal according to the maximum 20 MHz system bandwidth supported by the LTE system, and then performs interception to obtain a sequence of the corresponding synchronous tracking reference signals of the six consecutive PRB pairs.
  • the sequence of the obtained synchronization tracking reference signals is then transmitted in the corresponding 6 PRB pairs of #1, #2, #6, and #7 in the radio frame.
  • 20 MHz corresponds to 100 PRB pairs
  • 6 PRB pairs that send synchronous tracking reference signals are also 6 PRB pairs in the middle of 100 PRB pairs corresponding to 20 MHz.
  • the system bandwidth of the carrier is 6 PRB pairs, and the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6. Therefore, the UE receives the MIB information, and determines the subframe pattern sent by the synchronization tracking reference signal from the MIB information. Frames #1, #2, #6, and #7; and, the UE determines 6 PRB pairs whose transmission bandwidth is the system bandwidth of the carrier. After determining the subframe pattern and the transmission bandwidth, the UE finally receives the synchronization tracking reference signal in all six consecutive PRB pairs of subframes #1, #2, #6, and #7 in the radio frame.
  • the network side and the UE pre-arrange the synchronization tracking reference signal to transmit and receive in the determined PRB pair according to the CRS port 0 of the LTE 8; in other words, the determined side of the network side In the subframe corresponding to the frame pattern, the synchronous tracking reference signal is sent in the determined PRB through port 0 of the CRS specified by LTE R8; correspondingly, the UE is sure The port 0 corresponding to the CRS specified by port 0 LTE R8 in the subframe corresponding to the determined subframe pattern receives the synchronization tracking reference signal in the determined PRB pair.
  • the UE considers that the received sequence of the synchronization tracking reference signal generates a sequence of synchronization tracking reference signals according to the system bandwidth of 20 MHz supported by the LTE system, and considers that the sequence of the synchronization tracking reference signals of the six PRB pairs of the transmission bandwidth is from A sequence of synchronized tracking reference signals corresponding to the intercepted six PRB pairs in the sequence of generated synchronization tracking reference signals.
  • the system bandwidth of the carrier is 1.4 MHz, and for the LTE system, it corresponds to 6 PRB pairs; M and N respectively take values 25 and 6.
  • the network side uses the subframe offset parameter to indicate the starting subframe position of the synchronization tracking reference signal in the radio frame.
  • the setting of the subframe offset parameter ranges from 0, 1, 2, and 3.
  • the starting subframes of the subframe patterns corresponding to the values are #0, #1, #2, and #3, and the radio frame is set.
  • the intra-subframe pattern determines the subframe carrying the synchronization tracking reference signal in the radio frame in the manner of 2 consecutive subframes and then 3 subframes, and then 2 consecutive subframes.
  • the possible subframe pattern is the subframes #0, #1, #5, and #6 in the radio frame, or is a sub-frame in the radio frame. Frames #1, #2, #6, and #7, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8 and in the radio frame #9.
  • the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6. Therefore, the network side selects a reasonable subframe pattern of the synchronous tracking reference signal according to the unicast service and/or the multicast service scheduling requirement in the carrier. It is assumed that subframes #1, #2, #6, and #7 are determined; and, the network side determines the system bandwidth in which the transmission bandwidth is the carrier, that is, 6 PRB pairs, and the network side further determines the subframe offset corresponding to the subframe pattern.
  • the parameter takes a value of 1.
  • the network side After determining the subframe pattern, the transmission bandwidth, and the subframe offset parameter, the network side finally transmits the synchronization tracking reference signal in all six PRB pairs of subframes #1, #2, #6, and #7 in the radio frame.
  • the network side configures a subframe offset parameter in the MIB information, and is used to indicate to the UE that the starting subframe for transmitting the synchronization tracking reference signal in the carrier is #1; correspondingly, After receiving the subframe offset parameter, the UE can learn that the subframe pattern sent by the synchronization tracking reference signal is subframes #1, #2, #6, and #7, and the start subframe of the synchronization tracking reference signal is # 1.
  • the network side Before the synchronization tracking reference signal is sent, the network side first generates a sequence of the synchronization tracking reference signal according to the determined transmission bandwidth, and obtains a sequence of consecutive synchronization tracking reference signals of six consecutive PRB pairs, and then the subframe in the radio frame. 1. The sequence of the synchronized tracking reference signals obtained by the corresponding 6 PRB pairs of #2, #6, and #7.
  • the system bandwidth of the carrier is 6 PRB pairs, and the number of PRB pairs corresponding to the system bandwidth of the carrier is equal to 6. Therefore, the UE receives the MIB information, and learns from the MIB information that the subframe offset parameter has a value of 1, thereby Determining the subframe pattern transmitted by the synchronization tracking reference signal as subframes #1, #2, #6, and #7; and, the UE determines 6 PRB pairs whose transmission bandwidth is the system bandwidth of the carrier. After determining the subframe pattern and the transmission bandwidth, the UE finally receives the synchronization tracking reference signal in all six consecutive PRB pairs of subframes #1, #2, #6, and #7 in the radio frame according to the subframe offset parameter.
  • the network side and the UE pre-arrange the synchronization tracking reference signal to transmit and receive in the determined PRB pair according to the CRS port 0 of the LTE 8; in other words, the determined side of the network side In the subframe corresponding to the frame pattern, the synchronization tracking reference signal is sent in the determined PRB through the port 0 of the CRS specified by the LTE R8; correspondingly, the UE passes the CRS specified by the port 0 LTE R8 in the subframe corresponding to the determined subframe pattern.
  • Port 0 receives the synchronization tracking reference signal in the determined PRB pair.
  • the UE considers that the received sequence of the synchronization tracking reference signals generates a sequence of synchronization tracking reference signals according to the determined transmission bandwidth.
  • FIG. 4 is a schematic structural diagram of a device for transmitting a downlink reference signal according to an embodiment of the present invention; as shown in FIG.
  • the transmitting device includes: a first determining module 41 and a sending module 42; wherein, the first determining module 41 is configured Determining, according to a system bandwidth of the carrier, a transmission bandwidth of the subframe pattern and the downlink reference signal sent by the downlink reference signal, and transmitting the determined subframe pattern and the determined transmission bandwidth to the sending module 42;
  • the sending module 42 is configured to: after receiving the determined subframe pattern and the determined transmission bandwidth sent by the first determining module 41, send the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
  • the sending device is located at the network side, preferably a base station.
  • the sending module 42 is further configured to: before transmitting the downlink reference signal, generate a sequence of the downlink reference signal according to a maximum system bandwidth supported by the LTE system; and intercept the generated sequence of the downlink reference signal a sequence of the downlink reference signal corresponding to the determined PRB pair, and a sequence of the downlink reference signal sent in the PRB pair corresponding to the determined transmission bandwidth; or, according to the current carrier supported by the LTE system
  • the system bandwidth is generated, and the sequence of the downlink reference signal is generated as a sequence of the downlink reference signal sent in the PRB pair corresponding to the determined transmission bandwidth; or, the downlink reference is generated according to the determined transmission bandwidth.
  • a sequence of signals the sequence of the downlink reference signals transmitted in the PRB pair corresponding to the determined transmission bandwidth.
  • the sending module 42 is further configured to send a subframe offset parameter configured to indicate a location of the starting subframe of the downlink reference signal in the radio frame.
  • the specific processing procedure of the first determining module 41 in the sending device of the embodiment of the present invention is detailed in the embodiment shown in FIG. 1, and details are not described herein again.
  • an embodiment of the present invention further provides a receiving device for a downlink reference signal.
  • 5 is a schematic structural diagram of a receiving device of a downlink reference signal according to an embodiment of the present invention; as shown in FIG. 5, the receiving device includes: a second determining module 51 and a receiving module 52;
  • the second determining module 51 is configured to determine a transmission bandwidth of the subframe pattern and the downlink reference signal sent by the downlink reference signal according to the system bandwidth of the carrier, and send the determined subframe pattern and the determined transmission bandwidth to the receiving module 52.
  • the receiving module 52 is configured to receive the determined subframe sent by the second determining module 51. After the pattern and the determined transmission bandwidth, the downlink reference signal is received in the determined transmission bandwidth according to the determined subframe pattern.
  • the receiving device may be a UE or a small cell.
  • the receiving module 52 is further configured to determine, according to the received subframe subframe offset parameter, a starting subframe position of the received downlink reference signal in the radio frame.
  • An embodiment of the present invention further provides a transmission system for transmitting a downlink reference signal, where the system includes: a sending device and a receiving device;
  • the transmitting device is configured to determine, according to a system bandwidth of the carrier, a transmission bandwidth of the subframe pattern and the downlink reference signal that are sent by the downlink reference signal; and send the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern;
  • the receiving device is configured to determine, according to a system bandwidth of the carrier, a transmission bandwidth of the subframe pattern and the downlink reference signal that are sent by the downlink reference signal, and receive the downlink reference signal in the determined transmission bandwidth according to the determined subframe pattern.
  • the transmitting device is configured to determine that the subframe pattern is distributed according to a 5 ms period when the system bandwidth of the carrier is greater than the M PRB pairs, and determine that the transmission bandwidth is M PRB pairs; or, configured to be when the carrier When the system bandwidth is greater than N PRB pairs and less than or equal to M PRB pairs, it is determined that the subframe pattern is distributed according to a 5 ms period, and the transmission bandwidth is determined to be a PRB pair corresponding to the system bandwidth of the carrier; or, configured to be the carrier When the system bandwidth is equal to N PRB pairs, the subframe pattern is determined to be subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and # in the radio frame.
  • the PRB pair corresponding to the bandwidth or configured to determine that the subframe pattern is the subframes #0, #4, #5 and in the radio frame when the system bandwidth of the carrier is equal to N PRB pairs and is in the FDD mode. #9;
  • the subframe pattern is determined to be subframes #0, #1, #5, and #6 in the radio frame, and the PRB corresponding to the system bandwidth of the carrier is determined to be the transmission bandwidth.
  • the PRB corresponding to the system bandwidth of the carrier is determined to be the transmission bandwidth.
  • the receiving device is configured to: when the system bandwidth of the carrier is greater than the M PRB pairs, determine that the subframe pattern is distributed according to a 5 ms period, and determine that the transmission bandwidth is M PRB pairs; or, configure the system as the carrier.
  • the bandwidth is greater than N PRB pairs and less than or equal to M PRB pairs
  • the subframe pattern is determined to be distributed according to a 5 ms period
  • the PRB pair corresponding to the system bandwidth of the carrier is determined to be the transmission bandwidth; or configured to be the system bandwidth of the carrier.
  • the subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame, Or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame, and determine the system bandwidth of the transmission bandwidth as the carrier.
  • Corresponding PRB pair or configured to determine that the subframe pattern is subframes #0, #4, #5, and #9 in the radio frame when the system bandwidth of the carrier is equal to N PRB pairs and is in FDD mode.
  • the subframe pattern is determined as Subframes #0, #1, #5, and #6 in the line frame, and determining that the transmission bandwidth is a PRB pair corresponding to the system bandwidth of the carrier; or, configured, when the system bandwidth of the carrier is equal to N PRB pairs,
  • the subframe pattern is determined to be distributed according to a 2 ms period, and the PRB pair corresponding to the system bandwidth of the carrier is determined to be the transmission bandwidth.
  • the value of M is 25 and the value of N is 6.
  • the sending device is configured to determine that the subframe pattern is the subframes #0, #1, #5, and #6 in the radio frame, or the subframes #1, #2, and #6 in the radio frame. #7, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame, the sub-frame pattern is preferentially selected.
  • the subframes are all subframe patterns of the downlink subframe as the determined subframe pattern;
  • the receiving device is configured to determine that the subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame , or for subframes #2, #3 in the radio frame, #7 ⁇ #8, or subframes #3, #4, #8, and #9 in the radio frame, pre-arranging with the transmitting device that all the subframes in the preferential subframe pattern are sub-frames of the downlink subframe
  • the frame pattern is used as the determined sub-frame pattern.
  • the downlink subframe includes a special subframe in a TDD mode.
  • the sending device is configured to determine that the subframe pattern is the subframes #0, #1, #5, and #6 in the radio frame, or the subframes #1, #2, and #6 in the radio frame. #7, or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame, and need to select a unique sub-frame
  • the preferred subframe pattern is: subframes #0, #1, #5, and #6 in the radio frame;
  • the receiving device is configured to determine that the subframe pattern is subframes #0, #1, #5, and #6 in the radio frame, or subframes #1, #2, #6, and #7 in the radio frame , or subframes #2, #3, #7, and #8 in the radio frame, or subframes #3, #4, #8, and #9 in the radio frame, and pre-agreed to select a unique one.
  • the preferred subframe pattern of the receiving end is: subframes #0, #1, #5, and
  • the determining the transmission bandwidth is M PRB pairs, and is:
  • the sending device is configured to determine that the subframe pattern is distributed according to a 5 ms period, and is: determining that the subframe pattern is subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame. , or subframes #2 and #7 in the radio frame, or subframes #3 and #8 in the radio frame, or subframes #4 and #9 in the radio frame;
  • the receiving device is configured to determine that the subframe pattern is distributed according to a 5 ms period, and is: determining that the subframe pattern is subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or It is subframes #2 and #7 in the radio frame, or subframes #3 and #8 in the radio frame, or subframes #4 and #9 in the radio frame.
  • the sending device is configured to determine that the subframe pattern is the subframe #0 in the radio frame and #5, or subframes #1 and #6 in the radio frame, or subframes #2 and #7 in the radio frame, or subframes #3 and #8 in the radio frame, or in the radio frame Subframes #4 and #9, and need to select only - seed frame pattern when used, the preferred subframe pattern is: subframes #0 and #5;
  • the receiving device is configured to determine that the subframe pattern is subframes #0 and #5 in the radio frame, or subframes #1 and #6 in the radio frame, or subframes #2 and # in the radio frame 7, or is the subframes #3 and #8 in the radio frame, or the subframes #4 and #9 in the radio frame, and is pre-agreed with the transmitting device to select the only-seed frame pattern to use, preferably
  • the sub-frame pattern is: Subframes #0 and #5.
  • the sending device is configured to: in the MIB information or other high-layer signaling other than the MIB information, configure indication information for indicating a subframe pattern that is sent by the downlink reference signal in the receiving device carrier, and send the indication information;
  • the receiving device is configured to: according to the received MIB information or other high-layer signaling other than the MIB information, configured to indicate indication information of the subframe pattern that is sent by the downlink reference signal in the receiving device carrier, and determine to send the The sub-frame pattern used by the downlink reference signal.
  • the downlink reference signal is a synchronization tracking reference signal or a synchronization reference signal used for synchronous tracking of the receiving device and the carrier, or a cell-specific CS of the port 0 specified by the LTE R8 standard, or a common port in the LTE system. Mapping the transmitted CSI-RS or DM S, or the downlink reference signal is used for RRM measurement.
  • the sending device is further configured to: before the sending the downlink reference signal, generate a sequence of the downlink reference signal according to a maximum system bandwidth supported by the LTE system; and further configured to generate a sequence of the downlink reference signal from the generated And the sequence of the downlink reference signal sent by the PRB pair corresponding to the determined transmission bandwidth is taken as a sequence of the downlink reference signal sent in the PRB pair corresponding to the determined transmission bandwidth; or, according to the LTE system support a system bandwidth of the current carrier, generating a sequence of the downlink reference signal, as a sequence of the downlink reference signal sent in a PRB pair corresponding to the determined transmission bandwidth; or generating a location according to the determined transmission bandwidth Determining a sequence of downlink reference signals as the determined transmission bandwidth a sequence of the downlink reference signals transmitted by the PRB pair;
  • the receiving device is further configured to generate a sequence of the downlink reference signal according to a maximum bandwidth supported by the LTE system, and correspondingly a PRB pair corresponding to the determined transmission bandwidth that is intercepted from the generated sequence of the downlink reference signal a sequence of the downlink reference signal; or a sequence of the downlink reference signal generated according to a system bandwidth of a current carrier supported by the LTE system; or a sequence of the downlink reference signal generated according to the determined transmission bandwidth.
  • the transmitting device is further configured to: when transmitting the downlink reference signal, send a subframe offset parameter indicating a starting subframe position of the downlink reference signal in the radio frame;
  • the receiving device is further configured to determine, according to the received subframe offset parameter, a starting subframe position of the received downlink reference signal in the radio frame.
  • the subframe offset parameter ranges from 0, 1, 2, 3, and 4; when the determined subframe pattern is distributed according to a 2 ms period
  • the subframe offset parameter ranges from 0 to 1.
  • the range of the subframe offset parameter ranges Is 0, 1, 2, 3;
  • the specific processing procedure of the sending device in the embodiment of the present invention has been described in detail in the embodiment shown in FIG. 1 , and details are not described herein again.
  • the specific processing procedure of the receiving device in the embodiment of the present invention is shown in FIG. 2 . Details are shown in the illustrated embodiment and will not be described again here.
  • the sending device in this embodiment is the sending device of the downlink reference signal shown in FIG. 4; the sending device further includes: a first determining module 41 and a sending module 42.
  • the receiving device in this embodiment is The receiving device of the downlink reference signal shown in FIG. 5; the receiving device further includes: a second determining module 51 and a receiving module 52;
  • the first determining module 41 is configured to determine a downlink reference signal according to a system bandwidth of the carrier. Transmitting the transmission bandwidth of the subframe pattern and the downlink reference signal, and transmitting the determined subframe pattern and the determined transmission bandwidth to the transmitting module 42;
  • the sending module 42 is configured to: after receiving the determined subframe pattern sent by the first determining module 41 and the determined sending bandwidth, send the station to the receiving device according to the determined subframe pattern in the determined sending bandwidth. Describe the downlink reference signal;
  • the second determining module 51 is configured to determine a transmission bandwidth of the subframe pattern and the downlink reference signal sent by the downlink reference signal according to the system bandwidth of the carrier, and send the determined subframe pattern and the determined transmission bandwidth to the receiving module 52.
  • the receiving module 52 is configured to receive the determined subframe pattern and the determined transmission bandwidth sent by the second determining module 51, and then receive the sending by the sending device in the determined sending bandwidth according to the determined subframe pattern.
  • the downlink reference signal is configured to transmit the determined subframe pattern and the determined transmission bandwidth sent by the second determining module 51, and then receive the sending by the sending device in the determined sending bandwidth according to the determined subframe pattern.
  • the sending device may be implemented by a network side device in an actual application.
  • the network side device may be a base station; in the actual application, the receiving device may be a UE or a small
  • the first determining module 41 of the sending device and the second determining module 51 of the receiving device can be processed by a central processing unit (CPU) in the device and digital signal processing. (DSP, Digital Signal Processor) or Field Programmable Gate Array (FPGA) implementation
  • the transmitting module 42 in the transmitting device can be implemented by a transmitter or a transmitter of the transmitting device in an actual application.
  • the receiving module 52 in the receiving device may be implemented by a receiver or a receiver of the receiving device in an actual application.
  • embodiments of the present invention can be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can be embodied in the form of one or more computer program products embodied on a computer usable storage medium (including but not limited to disk storage and optical storage, etc.) in which computer usable program code is embodied.
  • a computer usable storage medium including but not limited to disk storage and optical storage, etc.
  • the computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing device to produce a machine such that a process or a process and/or a block diagram of a block or A device that has multiple functions specified in the box.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • the network side determines the transmission bandwidth of the downlink reference signal and the downlink reference signal according to the system bandwidth of the carrier, and sends the downlink reference signal; and the receiving end determines the transmission bandwidth according to the determined subframe pattern.
  • the transmission of the number is particularly suitable for the transmission of the synchronization tracking reference signal of the communication system in which the system bandwidth of the plurality of carriers exists.
  • the technical solution of the embodiment of the present invention weakens the existing to some extent.
  • the interference generated by the LTE 8 C S in the HetNet scenario may also enable the UE to use the downlink reference signal.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur un procédé, un dispositif, un système et un support de stockage informatique pour transmettre un signal de référence de liaison descendante. Le procédé pour transmettre le signal de référence de liaison descendante comprend les étapes suivantes : un côté réseau détermine, sur la base de la largeur de bande système d'une porteuse, un motif de sous-trames transmis par le signal de référence de liaison descendante et une largeur de bande de transmission pour le signal de référence de liaison descendante; et le côté réseau émet le signal de référence de liaison descendante conformément au motif de sous-trames déterminé et dans la largeur de bande de transmission déterminée.
PCT/CN2014/076366 2013-05-10 2014-04-28 Procédé, dispositif, système et support de stockage informatique pour transmettre un signal de référence de liaison descendante WO2014180265A1 (fr)

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WO2017101607A1 (fr) * 2015-12-16 2017-06-22 中兴通讯股份有限公司 Procédé et dispositif pour la transmission de données
BR112019022343A2 (pt) 2017-04-27 2020-08-04 Guangdong Oppo Mobile Telecommunications Corp., Ltd. método para transmitir um sinal de referência, terminal e dispositivo de rede
CN109672514B (zh) 2017-08-11 2020-07-14 华为技术有限公司 发送和接收参考信号的方法、网络设备、终端设备和系统
US11258566B2 (en) 2017-10-18 2022-02-22 Qualcomm Incorporated Aperiodic tracking reference signal
CN109995483B (zh) 2017-12-29 2020-09-04 华为技术有限公司 Trs段的传输方法和装置
CN110768769B (zh) * 2018-07-27 2022-03-29 华为技术有限公司 基于下行参考信号的时间同步方法和装置
CN111106885A (zh) 2018-11-12 2020-05-05 维沃移动通信有限公司 测量方法、指示方法、装置、终端、网络设备及介质

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