WO2017097109A1 - Procédé, appareil et dispositif d'estimation d'écart de temporisation de terminal dans une transmission multipoint coordonnée - Google Patents

Procédé, appareil et dispositif d'estimation d'écart de temporisation de terminal dans une transmission multipoint coordonnée Download PDF

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WO2017097109A1
WO2017097109A1 PCT/CN2016/106981 CN2016106981W WO2017097109A1 WO 2017097109 A1 WO2017097109 A1 WO 2017097109A1 CN 2016106981 W CN2016106981 W CN 2016106981W WO 2017097109 A1 WO2017097109 A1 WO 2017097109A1
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threshold value
time domain
channel estimation
domain channel
estimation result
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PCT/CN2016/106981
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Chinese (zh)
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郭保娟
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电信科学技术研究院
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0658—Feedback reduction
    • H04B7/066—Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • H04L25/03057—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure
    • H04L25/03063—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure using fractionally spaced delay lines or combinations of fractionally and integrally spaced taps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • 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
    • 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

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a method, device, and device for estimating terminal timing offset in coordinated multi-point transmission.
  • LTE Long Term Evolution
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDM orthogonal multiple access
  • CDMA Code Division Multiple Access
  • inter-cell interference is mainly reduced by ICIC (Inter Cell Interference Coordination).
  • the inter-base station reduces the interference of the cell edge users by cooperatively scheduling the transmission power of different radio resource blocks, thereby implementing the same-frequency networking.
  • ICIC Inter Cell Interference Coordination
  • the inter-base station reduces the interference of the cell edge users by cooperatively scheduling the transmission power of different radio resource blocks, thereby implementing the same-frequency networking.
  • a multi-point coordinated transmission method is adopted to reduce inter-cell interference, improve the spectrum efficiency of the system, and particularly improve the performance of the cell edge user.
  • CoMP Coordinated Multiple Points Transmission/Reception
  • UE User Equipment, terminal
  • a plurality of transmission points participating in cooperation generally refer to base stations of a plurality of cells.
  • CELLIDs Cell IDs
  • a heterogeneous network using a low-power RRH where the transmission or reception point is an RRH, has the same cell identifier as the macro cell. Since the RRH and the Macro have the same Cell ID, the downlink signal can be enhanced, and the macro cell is the serving cell.
  • RRH Remote Radio Head
  • TM10 Transmission Mode 10
  • TM10 has two UE behaviors: Type A (Type A) and Type B (Type B), where Type A considers all reference signals to be co-sited. No signaling is required; Type B considers that not all reference signals are co-sited, only high-level signaling
  • the reference signal is between QCL (Quasi-Co-Location).
  • the information that the network can notify the UE includes: CRS (Cell-specific Reference Signal) port number, non-zero power (NZP) CSI-RS (Channel State Information Reference Signal) Configuration information, zero-power (ZP) CSI-RS configuration information, and PQI information (ie, contents in Table 1).
  • CRS Cell-specific Reference Signal
  • NZP non-zero power
  • ZP Zero-power
  • PQI PQI information
  • each transmission point is configured with the same CELLID, and only the CRS pilot is configured in the serving cell. If the terminal receives the downlink data and is not at the transmission point where the serving cell is located, the corresponding CRS pilot cannot It reflects the characteristics of some wireless channel fading of downlink received data, so it needs to measure based on the non-zero power CSI-RS configured by the transmission point where the downlink data is located.
  • the upper layer signaling can configure up to four sets of parameter sets for the PDSCH (Physical Uplink Control) for a UE configured with TM10. Channel, physical uplink shared channel) decoding, as shown in Table 1.
  • PDSCH Physical Uplink Control
  • Channel Physical uplink shared channel
  • Each set of parameters includes a CRS port number (denoted as CRSport n ), ZP CSI-RS configuration information (represented as CSIRS n, ZP ), NZP CSI-RS configuration information (represented as CSIRS n, NZP ), and more Information such as the Multimedia Broadcast Single Frequency Network (MBSFN) identifier (denoted as MBSFN n ), the frequency offset (denoted as Freoff n ), and the PDSCH resource start position (denoted as PDSCHRB n ), where 1 ⁇ n ⁇ N, N represents the total number of parameter sets.
  • MBSFN Multimedia Broadcast Single Frequency Network
  • Freoff n the frequency offset
  • PDSCH resource start position denoted as PDSCHRB n
  • the PDCCH Physical Downlink Control Channel
  • EPDCCH Enhanced PDCCH
  • the downlink control channel is parsed to obtain PQI (PDSCH RE Mapping and Quasi-Co-Location Indicator) control information
  • PQI PDSCH RE Mapping and Quasi-Co-Location Indicator
  • the PQI control information is an identifier of the parameter set, assuming the nth sub-sub UE detected when frame
  • the PQI is i, and the UE performs subsequent data processing according to the information in the corresponding i-th parameter set.
  • the processing procedure is as follows:
  • the UE determines whether the current subframe has an NZP CSI-RS according to the configuration information CSIRS i, NZP of the NZP CSI-RS in the i-th parameter set, and the determination formula is specifically as shown in formula (1):
  • n f denotes a radio frame number
  • n denotes a subframe number
  • T CSI-RS denotes a CSI-RS period (unit is a subframe)
  • ⁇ CSI-RS denotes a CSI-RS subframe offset
  • T CSI-RS and ⁇ The CSI-RS is configured by a higher layer, where "mod" is a remainder operation.
  • the channel estimation information of the CSI-RS is calculated according to the configuration information CSIRS i, NZP of the NZP CSI-RS.
  • the timing advance amount IRT i,n of the nth subframe is zero, that is, the nth subframe is based on The result of the measurement of the i-th parameter set, where 0 ⁇ i ⁇ 3.
  • the UE respectively calculates a corresponding receiving timing for each set of parameter sets (where the parameter set refers to the information in Table 1), which is expressed as: assuming that the receiving timing is represented as timepos i , corresponding to the i-th parameter set
  • the reception timing is expressed by the formula (2) as:
  • Timepos i timepos i +IRT i,n formula (2)
  • the processed timing advance is used to calculate the corresponding receiving timing, and the timing corresponding to each set of parameter sets during the averaging or smoothing processing is performed.
  • the advance amount is processed separately.
  • the UE selects a receiving timing corresponding to the parameter set corresponding to the PQI information according to the PQI information received by the current subframe, As the reception timing of the current subframe UE.
  • the reception timing of each subframe may vary greatly, but does not affect the signal reception and processing of the terminal.
  • the configuration of the CSI-RS is not continuous, in different PQI configurations, the signal transmission interval of the CSI-RS configuration of the same parameter set is larger, and the UE reception timing cannot be adjusted in time, so the accuracy of the reception timing in this scheme is compared.
  • the CRS is poor, but since the RRH transmission point does not transmit the CRS, the reception timing can only be calculated using the CSI-RS.
  • the RRH Since the macro cell and the RRH belong to different transmission points, when the reception timing difference between the two transmission points is large, if the RRH signal is received according to the timing of the macro cell, the signal reception performance may be poor. Moreover, since the RRH does not transmit the CRS, accurate reception timing cannot be obtained according to the measurement result of the RRH. Based on this, it is necessary to provide a timing adjustment method of the UE in CoMP to improve the accuracy of the reception timing.
  • the embodiments of the present invention provide a method, a device, and a device for estimating a timing offset of a multipoint coordinated transmission, which are used to improve the accuracy of UE receiving timing in CoMP.
  • the embodiment of the present application provides a terminal timing offset estimation method in multi-point coordinated transmission, including:
  • determining a first threshold according to a maximum value of signal powers of each tap in the time domain channel estimation result and the first average noise power including:
  • determining the first threshold according to the first optional threshold and the second optional threshold including:
  • determining an initial estimated first-path position according to the first threshold value and a signal power of each tap in the time-domain channel estimation result including:
  • the timing deviation of the time domain channel estimation result is adjusted according to the initial estimated first path position, including:
  • determining a second threshold according to a maximum value of signal power of each tap in the adjusted time domain channel estimation result and the second average noise power including:
  • the second threshold is less than the first threshold.
  • the initial estimated initial path position is corrected to obtain the final timing deviation estimate, including:
  • a correction value of the initial estimated position of the initial path is calculated, and a sum of the initial estimated first path positions is determined, and the obtained sum value is determined as a final timing deviation estimated value.
  • the embodiment of the present application further provides a terminal timing offset estimation apparatus for multi-point coordinated transmission, including:
  • a first processing module configured to determine a channel state information reference signal CSI-RS pilot sequence carried in the received signal, and determine a time domain channel estimation result of the CSI-RS pilot sequence
  • a second processing module configured to determine signal power of each tap in the time domain channel estimation result, and determine a first average noise power of the time domain channel estimation result, according to each tap in the time domain channel estimation result Determining a first threshold value, a maximum value of the signal power, and the first average noise power, and determining an initial estimated initial path according to the first threshold value and a signal power of each tap in the time domain channel estimation result position;
  • a third processing module configured to adjust a timing offset of the time domain channel estimation result according to the initial estimated first path position, and determine a second average noise power of the adjusted time domain channel estimation result, according to the adjusted
  • the maximum value of the signal power of each tap in the time domain channel estimation result and the second average noise power determine a second threshold value according to the second threshold value and each tap in the adjusted time domain channel estimation result
  • the signal power is determined by determining a correction value of the initial estimated first diameter position, and correcting the initial estimated first diameter position according to the correction value to obtain a final timing deviation estimation value.
  • the second processing module is specifically configured to:
  • the second processing module is specifically configured to:
  • the second processing module is specifically configured to:
  • the third processing module is specifically configured to:
  • the third processing module is specifically configured to:
  • the second threshold is less than the first threshold.
  • the third processing module is specifically configured to:
  • a correction value of the initial estimated position of the initial path is calculated, and a sum of the initial estimated first path positions is determined, and the obtained sum value is determined as a final timing deviation estimated value.
  • the embodiment of the present application further provides a device, which mainly includes a processor and a memory, wherein the memory stores a preset program, and the processor is configured to read a program saved in the memory, and execute the following process according to the program:
  • the processor calculates a product of the first average noise power and the first coefficient to obtain a first optional threshold; and calculates a maximum value and a second of the signal power of each tap in the time domain channel estimation result.
  • the product of the coefficients obtains a second optional threshold; and the first threshold is determined according to the first selectable threshold and the second selectable threshold.
  • the processor determines that a minimum of the first optional threshold and the second optional threshold is the first threshold
  • the processor selects, among the signal powers of the taps in the time domain channel estimation result, a first tap position that is greater than the first threshold value, and determines the selected tap position as the initial estimated first diameter position.
  • the processor uses, as an initial tap position, a tap corresponding to the initial estimated first-path position in the time domain channel estimation result, and sequentially shifts each tap position in the time domain channel estimation result to obtain a timing offset adjustment. Post-time channel estimation results.
  • the processor calculates a product of the second average noise power and a third coefficient to obtain a third optional threshold; and calculates a maximum value of the signal power of each tap in the adjusted time domain channel estimation result. And a fourth optional threshold value obtained by multiplying the fourth coefficient; determining the second threshold value according to the third optional threshold value and the fourth optional threshold value.
  • the second threshold is less than the first threshold.
  • the processor selects, among the signal powers of the taps in the adjusted time domain channel estimation result, a first tap position that is greater than the second threshold value, and determines the selected tap position as the initial estimate.
  • a correction value of the first-path position; a correction value of the initial-path position of the initial estimate, and a sum of the initial-path position of the initial estimate, and the obtained sum value is determined as the final timing deviation estimation value.
  • the embodiment of the present application further provides a terminal timing offset estimation apparatus for multi-point coordinated transmission, including: a processor and a memory, wherein the memory stores a preset program, and the processor is configured to read the program saved in the memory, according to The program performs the following process:
  • the processor is specifically configured to:
  • the processor is specifically configured to:
  • the processor is specifically configured to:
  • the processor is specifically configured to:
  • the processor is specifically configured to:
  • the second threshold is less than the first threshold.
  • the processor is specifically configured to:
  • a correction value of the initial estimated position of the initial path is calculated, and a sum of the initial estimated first path positions is determined, and the obtained sum value is determined as a final timing deviation estimated value.
  • the time domain channel estimation result of the CSI-RS pilot sequence of the received signal after determining the time domain channel estimation result of the CSI-RS pilot sequence of the received signal, according to the maximum value of the signal power of each tap in the time domain channel estimation result, and the time Determining, by the first average noise power of the domain channel estimation result, a first threshold value, and determining an initial estimated first diameter position according to the first threshold value and channel power of each tap in the time domain channel estimation result, according to the initial
  • the estimated first-path position performs coarse timing offset adjustment on the time-domain channel estimation result, determining a second average noise power of the adjusted time-domain channel estimation result, according to the adjusted signal of each tap in the adjusted time-domain channel estimation result Determining a second threshold value according to a maximum value in the power and a second average noise power, and determining a first path position of the initial estimate according to the second threshold value and the signal power of each tap in the adjusted time domain channel estimation result
  • Correction value according to the correction value, correcting the initial path position of the initial
  • FIG. 1 is a schematic diagram of a process of receiving timing of a terminal in a CoMP scenario
  • FIG. 2 is a schematic flowchart of a method for estimating a timing offset of a terminal in a CoMP according to an embodiment of the present application
  • FIG. 3 is a schematic diagram of a channel estimation tap distribution in an ideal timing situation according to an embodiment of the present application.
  • 4a is a schematic diagram of a channel estimation tap distribution of a timing advance in the first embodiment of the present application
  • 4b is a schematic diagram of a channel estimation tap distribution after calibration in the first embodiment of the present application.
  • 5a is a schematic diagram of channel estimation tap distribution of timing lag in the second embodiment of the present application.
  • FIG. 5b is a schematic diagram of a channel estimation tap distribution after calibration according to Embodiment 2 of the present application.
  • FIG. 6 is a schematic structural diagram of a device in an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a device in an embodiment of the present application.
  • the delay spread is obtained by measuring the effective path of the signal, that is, the trailing diameter of the effective path minus the first diameter of the effective path, that is, the measurement result of the delay spread. If the terminal receiving timing adjustment is inaccurate, the first path of the signal effective path leads or lags too much, which will result in an effective path window, that is, the search space containing the effective path and the effective path in the noise window is inaccurate, directly affecting the effective path threshold. Calculation, which affects the delay spread measurement.
  • the method for adjusting the timing of the CoMP system proposed in the present application solves the downlink data receiving process in the CoMP scenario, and the main idea is: obtaining the initial estimated effective path by using the time domain channel estimation result of the CSI-RS by limiting the threshold. Position of the first path, and then adjusting the position of the initial estimated effective path first diameter position in the time domain channel estimation result to the zeroth time domain tap position, and comparing the adjusted time domain channel estimation result with the set threshold Determine the first diameter and the trailing diameter of the effective path, and finally obtain the delay extension measurement result.
  • the detailed method for estimating the timing offset of the terminal in CoMP is as follows:
  • Step 201 Determine a CSI-RS pilot sequence carried in the received signal, and determine a time domain channel estimation result of the CSI-RS pilot sequence.
  • the terminal After receiving the signal through the antenna port, the terminal converts the received signal into a frequency domain signal by time-frequency conversion, and performs data extraction on the frequency domain signal, that is, extracts the CSI-RS pilot position according to the configuration information of the CSI-RS.
  • Receiving data G f obtaining a CSI-RS pilot sequence according to the configuration information of the CSI-RS, denoted as R, and calculating a frequency domain channel estimation result of the CSI-RS, which is expressed by: Where H f represents the frequency domain channel estimation result of the CSI-RS.
  • IDFT Inverse Discrete Fourier Transform
  • Step 202 Determine signal power of each tap in the time domain channel estimation result, and determine a first average noise power of the time domain channel estimation result, according to a maximum value of signal power of each tap in the time domain channel estimation result, and the The first average noise power determines a first threshold value, and the initial estimated first-path position is determined according to the first threshold value and the signal power of each tap in the time-domain channel estimation result.
  • the noise window of the time domain channel estimation result is intercepted, and the first average noise power is calculated, wherein the noise window is determined according to the length of the CP (Cyclic Prefix) of the received signal, that is, the noise window is from the maximum CP length.
  • the position is determined by the range of the trailing position of the time domain channel estimation result.
  • the specific process of determining the first threshold is as follows:
  • the two coefficients can be determined by simulation or determined according to engineering requirements.
  • the first threshold is determined according to the first optional threshold and the second optional threshold, including but not limited to the following three implementation manners:
  • the first threshold determined by the first implementation is too small, and the searched channel estimates the leading position to lead.
  • the first threshold determined by the second implementation is too large, and the searched channel estimates the first path position to lag.
  • the received signal has a low signal-to-noise ratio characteristic, that is, when the signal-to-noise ratio of the received signal is lower than a preset threshold
  • the measurement of ⁇ 1 is relatively accurate, and ⁇ 1 is selected as the first threshold ⁇
  • the channel estimation first-path position can be obtained relatively accurately.
  • the received signal has a high signal-to-noise ratio characteristic, that is, when the signal-to-noise ratio of the received signal is higher than a preset threshold
  • the ⁇ 2 measurement is relatively accurate, and ⁇ 2 is selected as the first threshold ⁇ , which can be relatively accurate.
  • the first tap position greater than the first threshold value is determined, and the selected tap position is determined as the initial estimated first diameter position, which is denoted as ⁇ 1 .
  • Step 203 Adjust a timing deviation of the time domain channel estimation result according to the initial estimated first path position, and determine a second average noise power of the adjusted time domain channel estimation result, according to each tap in the adjusted time domain channel estimation result. a maximum value of the signal power and the second average noise power determining a second threshold value according to the second threshold value And adjusting the signal power of each tap in the adjusted time domain channel estimation result, determining a correction value of the initial estimated first diameter position, and correcting the initial estimated first diameter position according to the correction value to obtain a final timing deviation estimation value.
  • the tap corresponding to the initial path position of the initial estimation in the time domain channel estimation result is used as the initial tap position, and the tap positions in the time domain channel estimation result are sequentially translated to obtain the time domain channel estimation result after the timing offset adjustment.
  • the channel estimation value of the tap position ⁇ 1 in the time domain channel estimation result is translated to the position of the tap zero, and the tap positions in the time domain channel estimation result are sequentially translated according to the rule to obtain the timing after the timing offset adjustment. Domain channel estimation result.
  • the noise window of the adjusted time domain channel estimation result is intercepted, and the second average noise power is calculated.
  • the noise window used in the calculation of the second average noise power is the same as the noise window used in the calculation of the first average noise power.
  • the specific process of determining the second threshold is as follows:
  • the second threshold is less than the first threshold to ensure that all the valid signal taps in the time domain channel estimation result are performed after the first path position and the trailing position search are subsequently performed according to the second threshold value. Be included in the search as much as possible.
  • ⁇ ′ 1 ⁇ ′ 1 ⁇ P′ noise
  • P′ noise represents a second average noise power
  • the value, the fourth coefficient can be determined by simulation or can be determined according to engineering requirements.
  • the value of ⁇ ′ 1 is smaller than ⁇ 1
  • the value of ⁇ ′ 2 is smaller than ⁇ 2 to ensure that the determined second threshold is less than the first threshold.
  • the second threshold is determined according to the third optional threshold and the fourth optional threshold, including but not limited to the following three implementation manners:
  • ⁇ ' min( ⁇ ' 1 , ⁇ ' 2 ), wherein ' represents a second threshold value, ⁇ ' 1 denotes a third optional threshold value, and ⁇ ' 2 denotes a fourth selectable threshold value.
  • the second threshold determined by the first implementation is too small, and the searched channel estimates the leading position to lead.
  • ⁇ ' max( ⁇ ' 1 , ⁇ ' 2 ), where ⁇ ' represents a second threshold value, ⁇ ' 1 denotes a third optional threshold value, and ⁇ ' 2 denotes a fourth selectable threshold value.
  • the second threshold determined by the second implementation is too large, and the searched channel estimates the first path position to lag.
  • ⁇ ′ 2 represents the second optional threshold value
  • ⁇ is the preset specific gravity coefficient, and 0 ⁇ ⁇ ⁇ 1.
  • the received signal has a low signal to noise ratio characteristic, i.e., lower than a preset threshold value of the received signal SNR, ⁇ '1 measurement more accurate, selection ⁇ ' 1 as the second threshold
  • the value ⁇ ' can obtain a correction value of the initial estimated initial path position relatively accurately.
  • the received signal has a high signal-to-noise ratio characteristic, that is, in the case where the signal-to-noise ratio of the received signal is higher than a preset threshold, the measurement of ⁇ ′ 2 is relatively accurate, and ⁇ ′ 2 is selected as the second threshold ⁇ ′,
  • the correction value of the initial estimated first diameter position can be obtained relatively accurately.
  • the process of determining the final timing offset estimate is:
  • timing offset adjustment of the received signal is performed according to the final timing deviation estimation value, and the performance of the receiver is improved by improving the accuracy of the timing offset adjustment and the accurate measurement of the delay spread.
  • the final timing offset estimates are calculated according to the procedures described in steps 201 to 203, and the final corresponding to each port of each receiving antenna is calculated.
  • the average of the timing offset estimates is used as the final timing offset estimate for the terminal.
  • the first threshold and the second threshold corresponding to each port of each receiving antenna are respectively determined.
  • the average value of each first threshold value is calculated as the first threshold value for final timing deviation estimation, and the average value of each second threshold value is calculated to finally determine the second threshold value of the timing deviation estimation.
  • the average value of the power of the time domain channel estimation result of the received signal of each port of each receiving antenna is calculated.
  • An average of the first average noise power of the received signal of each port of each receiving antenna and an average of the second average noise power are calculated.
  • the average value of the first threshold value is used instead of the first threshold value
  • the average value of the second threshold value is used instead of the second threshold value
  • the first average noise power is used.
  • the average value of the first average noise power is replaced by the average value of the second average noise power, and the signal power of each tap in the average value of the power of the time domain channel estimation result is used to replace the time domain channel estimation result.
  • the signal power of each tap determines the final timing offset estimate of the terminal according to the procedure described in steps 201 through 203.
  • timing deviation estimation process provided by the embodiment of the present application is exemplified by two specific embodiments.
  • N FFT IDFT length denoted as N FFT
  • N FFT time domain channel estimate taps ranging from [-N leak: N FFT -N leak ]
  • the noise window is [N ⁇ :N FFT -N leak ]
  • N ⁇ is the tap position corresponding to the CP length.
  • the maximum tap position is at the position of tap 0, and the useful signal power is distributed outside the noise window, as shown in Figure 3, which is a schematic diagram of the channel estimation tap distribution for ideal timing.
  • the noise window is [80,108]
  • the useful signal tap range is [-20:79]
  • the timing advance is 30, as shown in Figure 4a.
  • some useful signals are included in the range of the noise window, and the threshold is obtained according to the noise power of the mixed useful signal to obtain the delay extension and the timing deviation information, and the error is relatively large, so the error is relatively large.
  • the channel estimation needs to be calibrated according to the roughly estimated timing deviation. Assuming that the roughly estimated first-path position ⁇ 1 is 20, the calibrated channel estimation tap distribution is as shown in FIG. 4b, and the noise window does not contain the useful signal tap. Based on the noise power and signal power, the delay spread and the timing deviation can be estimated to improve the accuracy.
  • a device for estimating the timing of the terminal in the CoMP is provided in the embodiment of the present application.
  • the device mainly includes:
  • the first processing module 601 is configured to determine a channel state information reference signal CSI-RS pilot sequence carried in the received signal, and determine a time domain channel estimation result of the CSI-RS pilot sequence;
  • a second processing module 602 configured to determine signal power of each tap in the time domain channel estimation result, and determine a first average noise power of the time domain channel estimation result, according to each tap in the time domain channel estimation result a maximum value of the signal power and the first average noise power determining a first threshold value, and determining an initial estimate based on the first threshold value and a signal power of each tap in the time domain channel estimation result Diameter position
  • the third processing module 603 is configured to adjust a timing offset of the time domain channel estimation result according to the initial estimated first path position, and determine a second average noise power of the adjusted time domain channel estimation result, according to the adjusted
  • the maximum value of the signal power of each tap and the second average noise power in the time domain channel estimation result determine a second threshold value, according to the second threshold value and each of the adjusted time domain channel estimation results
  • the signal power of the tap determines a correction value of the initial estimated first diameter position, and corrects the initial estimated first diameter position according to the correction value to obtain a final timing deviation estimation value.
  • the second processing module is specifically configured to:
  • the second processing module is specifically configured to:
  • the second processing module is specifically configured to:
  • the third processing module is specifically configured to:
  • the third processing module is specifically configured to:
  • the second threshold is less than the first threshold.
  • the third processing module is specifically configured to:
  • a correction value of the initial estimated position of the initial path is calculated, and a sum of the initial estimated first path positions is determined, and the obtained sum value is determined as a final timing deviation estimated value.
  • the embodiment of the present application further provides a device.
  • the device mainly includes a processor 701. And a memory 702, wherein the memory 702 stores a preset program, and the processor 701 is configured to read a program saved in the memory 702, and execute the following process according to the program:
  • the processor calculates a product of the first average noise power and the first coefficient to obtain a first optional threshold; and calculates a maximum value and a second of the signal power of each tap in the time domain channel estimation result.
  • the product of the coefficients obtains a second optional threshold; and the first threshold is determined according to the first selectable threshold and the second selectable threshold.
  • the processor determines that a minimum of the first optional threshold and the second optional threshold is the first threshold
  • the processor selects, among the signal powers of the taps in the time domain channel estimation result, a first tap position that is greater than the first threshold value, and determines the selected tap position as the initial estimated first diameter position.
  • the processor uses, as an initial tap position, a tap corresponding to the initial estimated first-path position in the time domain channel estimation result, and sequentially shifts each tap position in the time domain channel estimation result to obtain a timing offset adjustment. Post-time channel estimation results.
  • the processor calculates a product of the second average noise power and a third coefficient to obtain a third optional threshold; and calculates a maximum value of the signal power of each tap in the adjusted time domain channel estimation result. And a fourth optional threshold value obtained by multiplying the fourth coefficient; determining the second threshold value according to the third optional threshold value and the fourth optional threshold value.
  • the second threshold is less than the first threshold.
  • the processor selects, among the signal powers of the taps in the adjusted time domain channel estimation result, a first tap position that is greater than the second threshold value, and determines the selected tap position as the initial estimate.
  • a correction value of the first-path position; a correction value of the initial-path position of the initial estimate, and a sum of the initial-path position of the initial estimate, and the obtained sum value is determined as the final timing deviation estimation value.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by the processor and various circuits of the memory represented by the memory.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the processor is responsible for managing the bus architecture and the usual processing, and the memory can store the data that the processor uses when performing operations.
  • the device can be a terminal in combination with a specific application scenario.
  • the time domain channel estimation result of the CSI-RS pilot sequence of the received signal after determining the time domain channel estimation result of the CSI-RS pilot sequence of the received signal, according to the maximum value of the signal power of each tap in the time domain channel estimation result, and the time Determining, by the first average noise power of the domain channel estimation result, a first threshold value, and determining an initial estimated first diameter position according to the first threshold value and channel power of each tap in the time domain channel estimation result, according to the initial
  • the estimated first-path position performs coarse timing offset adjustment on the time-domain channel estimation result, determining a second average noise power of the adjusted time-domain channel estimation result, according to the adjusted signal of each tap in the adjusted time-domain channel estimation result Determining a second threshold value according to a maximum value in the power and a second average noise power, and determining a first path position of the initial estimate according to the second threshold value and the signal power of each tap in the adjusted time domain channel estimation result
  • Correction value according to the correction value, correcting the initial path position of the initial
  • embodiments of the present application can be provided as a method, system, or computer program product.
  • the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
  • the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • 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 are provided for implementing one or more processes and/or block diagrams in the flowchart The steps of the function specified in the box or in multiple boxes.

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

Abstract

L'invention concerne un procédé, un appareil et un dispositif d'estimation d'écart de temporisation de terminal dans une transmission multipoint coordonnée, pour améliorer la précision de la temporisation de réception d'un équipement utilisateur (UE) dans une CoMP. Le procédé comprend les étapes suivantes : déterminer une puissance de signal de chaque toucher dans un résultat d'estimation de canal de domaine temporel d'une séquence pilote de signal de référence d'informations d'état de canal (CSI-RS), déterminer une première puissance de bruit moyenne du résultat d'estimation de canal de domaine temporel, déterminer une première valeur de seuil selon une valeur maximale dans la puissance de signal de chaque toucher et la première puissance de bruit moyenne, et déterminer une position de trajet initiale estimée initialement selon la première valeur de seuil ; et après réglage d'un écart de temporisation du résultat d'estimation de canal de domaine temporel selon la position de trajet initiale estimée initialement, déterminer une seconde puissance de bruit moyenne, déterminer une seconde valeur de seuil selon la valeur maximale dans la puissance de signal de chaque toucher et la seconde puissance de bruit moyenne, déterminer une valeur modifiée de la position de trajet initiale estimée initialement selon la seconde valeur de seuil, et modifier la position de trajet initiale estimée initialement selon la valeur modifiée pour obtenir une valeur d'estimation d'écart de temporisation finale.
PCT/CN2016/106981 2015-12-10 2016-11-23 Procédé, appareil et dispositif d'estimation d'écart de temporisation de terminal dans une transmission multipoint coordonnée WO2017097109A1 (fr)

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