WO2015024210A1 - 一种选择预编码矩阵指示的方法、装置及系统 - Google Patents

一种选择预编码矩阵指示的方法、装置及系统 Download PDF

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Publication number
WO2015024210A1
WO2015024210A1 PCT/CN2013/081938 CN2013081938W WO2015024210A1 WO 2015024210 A1 WO2015024210 A1 WO 2015024210A1 CN 2013081938 W CN2013081938 W CN 2013081938W WO 2015024210 A1 WO2015024210 A1 WO 2015024210A1
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WO
WIPO (PCT)
Prior art keywords
pmi
base station
terminal
uplink data
indication information
Prior art date
Application number
PCT/CN2013/081938
Other languages
English (en)
French (fr)
Inventor
张华炜
张劲林
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP13891703.4A priority Critical patent/EP3024154B1/en
Priority to CN201380001142.3A priority patent/CN103650400B/zh
Priority to PCT/CN2013/081938 priority patent/WO2015024210A1/zh
Publication of WO2015024210A1 publication Critical patent/WO2015024210A1/zh
Priority to US15/046,192 priority patent/US9705577B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0617Diversity 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 for beam forming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0636Feedback format
    • H04B7/0639Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for selecting a precoding matrix indication.
  • Uplink SU-MIMO Single User Multiple Input Multiple Output
  • PMI Precoding Matrix Indication
  • the base station receives the sounding signal sent by the terminal periodically. After receiving the sounding signal, the base station parses the sounding signal to obtain a channel response, and performs data processing on the obtained channel response according to the PMI selection criterion. Select the appropriate PMI in the PMI set and send the selection to the terminal.
  • the choice of PMI in the prior art is based on sounding measurements. Whether the terminal supports sounding transmission, sounding measurement period, or band resource issues will affect the accuracy of PMI selection, thus affecting the performance gain of SU-MIMO.
  • Embodiments of the present invention provide a method, apparatus, and system for selecting a precoding matrix indication for solving the problem of inaccurate PMI selection in the prior art, resulting in system performance degradation.
  • a method for selecting a precoding matrix indication including: sending, by a base station, a terminal Instructing information, the indication information is used to indicate that the terminal does not weight or use the unit matrix to weight transmit uplink data; receive the uplink data sent by the terminal; and indicate, according to the uplink data, from a precoding matrix of the base station Selecting a first PMI in the PMI set; transmitting the first PMI to the terminal.
  • the indication information is a second PMI, where the second PMI is a PMI corresponding to a unit matrix codebook in a PMI set of the base station, and the uplink data is Uplink data that is weighted and transmitted by the terminal according to the unit matrix codebook corresponding to the second PMI.
  • the sending, by the base station, the indication information to the terminal includes: sending the indication information to the terminal aperiodically.
  • the sending the indication information to the terminal aperiodically includes: transmitting, to the terminal, when demodulating the reference signal Indicate the indication information.
  • the sending, by the base station, the indication information to the terminal includes: periodically sending the indication information to the terminal.
  • the sending period of the indication information is smaller than a sending period of the detecting signal of the terminal.
  • a second aspect provides a method for selecting a precoding matrix indication, including: receiving, by a terminal, indication information sent by a base station; and transmitting, according to the indication information, unweighted uplink data or uplink data weighted by an identity matrix to a base station;
  • the first precoding matrix sent by the base station indicates a PMI, where the first PMI is selected by the base station according to uplink data sent by the terminal from a PMI set of the base station.
  • the indication information is a second PMI, where the second PMI is a PMI corresponding to the unit matrix codebook in the base station PMI set; Indication information, sending unweighted uplink data to the base station or using the unit matrix weighted uplink number According to the second PMI, the unit matrix codebook corresponding to the second PMI is selected; the uplink data is weighted by using the unit matrix codebook corresponding to the second PMI; and the weighted is sent to the base station. Upstream data.
  • the indication information is sent by the base station when demodulating the reference signal.
  • the indication information is periodically sent by the base station.
  • the sending period of the indication information is smaller than a sending period of the detecting signal of the terminal.
  • a base station including:
  • a sending unit configured to send, to the terminal, the indication information, where the indication information is used to indicate that the terminal does not weight or use the unit matrix to weight the uplink data;
  • a receiving unit configured to receive the uplink data sent by the terminal
  • a selecting unit configured to select, according to the uplink data received by the receiving unit, a first PMI from a precoding matrix indication PMI set of the base station;
  • the sending unit is further configured to send the first PMI selected by the selecting unit to the terminal.
  • the indication information that is sent by the sending unit is a second PMI, where the second PMI is a PMI corresponding to a unit matrix codebook in a PMI set of the base station. ;
  • the uplink data received by the receiving unit is uplink data that is sent by the terminal according to the unit matrix codebook corresponding to the second PMI.
  • the sending The unit is specifically configured to: when demodulating the reference signal, send the indication information to the terminal.
  • the sending period of the indication information is smaller than a sending period of the detecting signal of the terminal.
  • a terminal including:
  • a receiving unit configured to receive indication information sent by the base station
  • a processing unit configured to obtain, according to the indication information received by the receiving unit, unweighted uplink data or uplink data weighted by an identity matrix
  • a sending unit configured to send the uplink data obtained by the processing unit to a base station, where the receiving unit is further configured to receive a first precoding matrix indication sent by the base station
  • the PMI, the first PMI is selected by the base station from the PMI set of the base station according to uplink data sent by the sending unit.
  • the indication information received by the receiving unit is a second PMI, where the second PMI is a PMI corresponding to a unit matrix codebook in the PMI set of the base station;
  • the processing unit is specifically configured to:
  • the uplink data is weighted by using the unit matrix codebook corresponding to the second PMI, and the uplink data weighted by the unit matrix is obtained.
  • the indication information is sent by the base station when demodulating the reference signal.
  • the indication information is periodically sent by the base station.
  • the sending period of the indication information is smaller than a sending period of the detecting signal of the terminal.
  • the invention provides a computer program product, comprising a computer readable medium, comprising: a set of program code for performing a possible implementation of any of the first aspect or the first aspect Said method.
  • a computer program product comprising a computer readable medium, the computer readable medium comprising a set of program code for performing any of the second aspect or the second aspect The method described for the implementation.
  • FIG. 1 is a signaling diagram of a method for selecting a PMI according to an embodiment of the present invention
  • FIG. 2 is a signaling diagram of a method for selecting a PMI according to another embodiment of the present invention.
  • FIG. 3 is a flowchart of a method for selecting a PMI according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for selecting a PMI according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a method for selecting a PMI according to another embodiment of the present invention.
  • FIG. 6 is a signaling diagram of a method for selecting a PMI according to another embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a base station according to another embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a terminal according to another embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • the choice of PMI is based on sounding measurement. Whether the terminal supports sounding transmission, the sounding measurement period, or the frequency band resource will affect the accuracy of PMI selection, thus affecting the performance gain of SU-MIMO.
  • the following embodiments provide a method for selecting a PMI without relying on sounding.
  • the base station can actively initiate a PMI selection when needed, without relying on a sounding signal sent by the terminal, so as to improve the accuracy of the PMI selection, thereby improving SU-MIMO. Performance gain.
  • the base station may instruct the terminal to use the unit matrix to weight or unweight the uplink data, that is, to transmit the uplink data by using the unit matrix weighted channel or the unweighted channel, and the channel at this time does not introduce the codebook that affects the PMI measurement.
  • Information codes other than the unit matrix codebook. Therefore, the base station can select an appropriate PMI and send it to the terminal according to the channel response obtained at this time.
  • the method for selecting a PMI provided by the embodiment of the present invention may be used in combination with the existing method for selecting a PMI based on the sounding measurement, and the embodiment of the present invention does not impose any limitation.
  • FIG. 1 is a signaling diagram of a method for selecting a PMI according to an embodiment of the present invention. As shown in FIG. 1 , the method includes the following steps:
  • Step 101 The base station sends the indication information to the terminal, where the indication information is used to indicate that the terminal does not weight or use the unit matrix weight to send the uplink data.
  • Step 102 The terminal sends the uplink data according to the above indication information, without weighting or using the unit matrix weighting.
  • Step 103 The base station selects a PMI from the PMI set of the base station according to the uplink data sent by the terminal.
  • Step 104 The base station sends the selected PMI to the terminal.
  • the base station may send the indication information to the terminal when needed, thereby actively initiating the PMI selection without relying on the sounding signal sent by the terminal, so as to improve the accuracy of the PMI selection, thereby improving the performance of the SU-MIMO.
  • Gain Since the uplink data is transmitted by the unit matrix weighted or unweighted, the channel at this time does not introduce the codebook information (the codebook other than the unit matrix codebook) that affects the PMI measurement. Therefore, the base station can select an appropriate channel according to the channel response obtained at this time. The PMI is sent to the terminal, so that the terminal can transmit uplink data with more accurate PMI weighting to improve the performance gain of the SU-MIMO.
  • the base station may send the indication information by means of periodic or aperiodic transmission.
  • the indication information may be transmitted to the terminal when demodulating the reference signal (hereinafter referred to as DMRS time).
  • the channel in each measurement period of sounding, the channel is not weighted by the PMI codebook, and at the time of DMRS, the channel has been weighted by the PMI codebook, and the channel at this time also contains the codebook information, and The channel containing the codebook information cannot be PMI measured by the base station. Therefore, if the prior art scheme is still used at the time of DMRS, the base station cannot use the channel of the DMRS time to perform PMI selection. At the time of DMRS, the method provided in the above embodiment can effectively solve the problem that PMI selection cannot be performed at the time of DMRS.
  • the quality of the channel can be further considered, and a time when the channel quality is better is selected, the above PMI selection process is triggered, and the indication information is sent. For example, according to the measurement of the terminal, it is judged whether the signal to noise ratio satisfies a preset condition, for example, the signal to noise ratio is greater than a certain threshold value.
  • a preset condition for example, the signal to noise ratio is greater than a certain threshold value.
  • the transmission period of the above indication information may be smaller than the transmission period of the terminal sounding signal.
  • the accuracy of the PMI selection is affected by the sounding measurement period.
  • Setting the transmission period of the indication information to be smaller than the measurement period of the sounding can further improve the accuracy of the PMI selection.
  • the transmission period of the indication information is not suitable for being too small, and those skilled in the art can set it as needed.
  • the transmission period of the indication information may not be limited by the measurement period size of the sounding, for example, when the terminal does not support the sounding signal transmission; or combine the method with the existing sounding measurement selection PMI according to the method; or Combined with the way of non-periodic sending.
  • the embodiment of the invention does not impose any limitation.
  • the base station selects the PMI as a technology well-known to those skilled in the art, and details are not described herein.
  • a system performance optimal target criterion in an embodiment is described in detail later, but is not used. To limit the invention, and the improvement of the present invention is not here, those skilled in the art can select using any of the prior art or future generation PMI selection algorithms.
  • the indication information sent by the base station may be only an indication signal, which is used to indicate that the terminal uses the unit matrix to weight or unweight to send the uplink data.
  • the indication information sent by the base station may also be a PMI, where the PMI corresponds to a unit matrix codebook (ie, a unit matrix) in the PMI set of the base station, and is used to indicate that the terminal uses the unit matrix codebook corresponding to the PMI to perform weighted transmission of uplink data.
  • the PMI in step 103 is referred to as a first PMI
  • the PMI transmitted in step 101 is referred to as a second PMI.
  • FIG. 2 is a signaling diagram of a method for selecting a PMI according to another embodiment of the present invention. As shown in FIG. 2, the method includes the following steps:
  • Step 201 The base station sends a second PMI to the terminal, where the second PMI is a PMI corresponding to the unit matrix codebook (referred to as a unit codebook) in the PMI set of the base station.
  • the second PMI is a PMI corresponding to the unit matrix codebook (referred to as a unit codebook) in the PMI set of the base station.
  • Step 202 The terminal performs weighting according to the second PMI selection unit matrix codebook to obtain uplink data.
  • the matrix of the channel is H
  • the terminal selects the unit matrix codebook according to the second PMI as I
  • the uplink data to be sent is X
  • the weighted uplink data Y is:
  • Step 203 The terminal sends uplink data to the base station.
  • Step 204 The base station selects a first PMI from a PMI set of the base station according to the received uplink data.
  • Step 205 The base station sends the selected first PMI to the terminal.
  • this embodiment can be compatible with existing protocols and achieve the purpose of improving the accuracy of PMI selection.
  • the transmission form of the second PMI is the same as that of the above embodiment, and details are not described herein again.
  • FIG. 3 it is a flowchart of a method for selecting a PMI according to an embodiment of the present invention.
  • the base station side including:
  • Step 301 Send indication information to the terminal, where the indication information is used to indicate that the terminal does not weight or use the unit matrix weight to send uplink data.
  • the base station may periodically send the indication information, or may send the indication information aperiodically. Specifically, the description of the above embodiments is omitted here.
  • Step 302 Receive uplink data sent by the terminal.
  • Step 303 Select a first PMI from a PMI set of the base station according to the received uplink data.
  • Step 304 Send the first PMI to the terminal.
  • Step 3031 Perform channel estimation on the uplink data to obtain a channel response set on the scheduling bandwidth.
  • the uplink data may be channel estimated by a DMRS (DeModulation Reference Signal).
  • the channel response set includes a plurality of channel moments P, for example, H, H 2 , 3 ⁇ 4 H m , m is a number of channel matrices, and is a positive integer, and each channel matrix corresponds to one RB (Resource Block, resource) Piece). And each channel matrix reflects channel state information on each RB.
  • Step 3032 Perform data processing on each channel matrix in each PMI and channel response set in the PMI set of the base station according to the system performance optimal target criterion, and obtain a measured value, where the PMI corresponding to the maximum measured value is the selected first PMI. .
  • the above PMI set is a PMI set specified by 3GPP TS 36.211 (The 3rd Generation Partnership Project Technology Specification 36.211, 3rd Generation Partnership Project Technology Agreement 36.211).
  • the system performance optimal target criteria include: a received signal power maximization criterion, or a system throughput maximization criterion.
  • the received signal power maximization criterion is taken as an example for detailed description:
  • the PMI set includes n PMIs, PMIj, PMI 2 , and PMI 3 PMI n , where n is a positive integer.
  • Data processing is performed on the PMI set and the channel response set according to the received signal power maximization criterion, as follows:
  • IPMIj Hil+IPMIj ⁇ 2
  • S! ;
  • Si, S 2 and S 3 are respectively measured value 1, measured value 2, measured value 3, ... measured value i, and each measured value obtained is compared, wherein the largest value is measured
  • the corresponding PMI is the selected PMI.
  • a method for selecting a PMI, which is related to the terminal side is provided in another embodiment of the present invention, as shown in FIG.
  • Step 501 Receive a second PMI sent by the base station, where the second PMI is a PMI corresponding to a unit matrix codebook (referred to as a unit codebook) in the PMI set of the base station.
  • a unit codebook a unit matrix codebook
  • the indication information is PMI, that is, the second PMI.
  • the second PMI is sent by the base station periodically or aperiodically.
  • the transmission time may be when the reference signal is demodulated, that is, the DMRS time.
  • the transmission period may be shorter than the transmission period of the detection signal of the terminal.
  • Step 502 The terminal selects an identity matrix codebook corresponding to the second PMI according to the second PMI.
  • the uplink data is weighted by the selected unit matrix codebook. For example, it is assumed that: the matrix of the channel is H, the code matrix of the unit matrix selected by the terminal according to the second PMI is I, and the uplink data to be sent is X, and the uplink data Y sent after weighting is:
  • Step 503 The terminal sends the weighted uplink data to the base station.
  • Step 504 Receive a first PMI sent by the base station, where the first PMI is selected by the base station according to the uplink data sent by the terminal from the PMI set of the base station.
  • the terminal can transmit the uplink data by using the first PMI weight selected by the base station.
  • a method for selecting a PMI includes: Step 601: Send a PMI corresponding to an identity matrix codebook to a terminal.
  • the PMI is a PMI corresponding to the unit matrix codebook in the PMI set in the base station.
  • the base station may periodically send the PMI, or may send the PMI irregularly.
  • the PMI corresponding to the unit matrix codebook can be sent through the PDCCH.
  • Step 602 The terminal receives a PMI corresponding to the unit matrix codebook sent by the base station.
  • Step 603 The terminal selects the unit matrix codebook and the data to be transmitted according to the PMI corresponding to the unit matrix codebook to perform weighting to obtain a weighted signal.
  • Step 604 The terminal sends the weighting signal to the base station.
  • Step 605 The base station performs channel estimation on the weighted signal to obtain a channel response set.
  • the channel estimation is performed on the weighted signal by using a DMRS (DeModulation Reference Signal).
  • DMRS DeModulation Reference Signal
  • the channel response set includes four channel matrices H, H 2 , H 3 ,
  • each channel matrix H corresponds to one RB.
  • the channel matrix H is channel state information on each RB.
  • Step 606 Perform a data processing on each PMI in the PMI set and each channel matrix H in the channel response set according to a system performance optimal target criterion, and the PMI corresponding to the maximum measurement value is the selected PMI. .
  • the PMI set in the embodiment of the present invention is composed of 3GPP TS 36.211 (The 3rd Generation Partnership Project Technology Specification 36.211, Third Generation Partnership Project Technical Agreement 36.211).
  • the system performance optimal target criteria include: a received signal power maximization criterion, a system throughput maximization criterion, and the like.
  • the received signal power maximization criterion is taken as an example for description: It is assumed that the PMI set includes four PMIs, PMIj, PMI 2 , PMI 3 , and PMI 4 .
  • the data processing is performed on the PMI set and the channel response set according to the received signal power maximization criterion, specifically:
  • IPMIj Hil+IPMIj H 2
  • S!;
  • each PMI in the PMI set by each channel matrix H in the channel response set to obtain a matrix of metric values, calculating a modulus value of the metric matrix, and adding the moduli values to obtain the The measure corresponding to each PMI.
  • Si, S 2 , S 3 , and S 4 are measured value 1, measured value 2, measured value 3, and measured value 4, respectively, and each measured value obtained is compared, and the largest value of the measured value is assumed S 3 , then the PMI 3 corresponding to S 3 is the selected PMI.
  • Step 607 Send the selected PMI to the terminal.
  • Step 608 The terminal receives the selected PMI, so that the terminal uses a suitable PMI for data transmission.
  • the base station sends the indication information to the terminal, the terminal sends the uplink data according to the indication information unweighted or weighted by the unit matrix, and the base station obtains the PMI from the base station according to the received uplink data.
  • the first PMI is selected and sent to the terminal, and the terminal uses the first PMI to perform data transmission.
  • the base station can actively initiate the PMI selection when needed, without relying on the sounding signal sent by the terminal, so as to improve the accuracy of the PMI selection, thereby improving the performance gain of the SU-MIMO.
  • an embodiment of the present invention further provides a base station, including:
  • the sending unit 71 is configured to send the indication information to the terminal.
  • the indication information is used to indicate that the terminal does not weight or use the unit matrix weight to send uplink data.
  • the sending unit 71 is specifically configured to: send the indication information to the terminal periodically or aperiodically. For example, when the indication information is transmitted aperiodically, the indication information may be transmitted to the terminal when the reference signal is demodulated. For example, when the indication information is periodically sent, the transmission period of the indication information is smaller than a period in which the terminal sends a sounding signal to the base station, and the transmission period of the sounding signal is usually set by the base station.
  • the receiving unit 72 is configured to receive the uplink data sent by the terminal.
  • the selecting unit 73 is configured to select a first PMI from the precoding matrix indication PMI set of the base station according to the uplink data received by the receiving unit.
  • the sending unit 71 is further configured to send the first PMI selected by the selecting unit 73 to the terminal.
  • the indication information sent by the sending unit 71 is a second PMI, where the second PMI is a PMI corresponding to the unit matrix codebook in the PMI set of the base station; and the receiving unit 72 receives the
  • the uplink data is uplink data that is weighted and transmitted by the terminal according to the unit matrix codebook corresponding to the second PMI.
  • the base station sends the indication information to the terminal, the terminal sends the uplink data to the base station according to the indication information unweighted or the unit matrix weight, and selects the first from the PMI set of the base station according to the received uplink data.
  • the PMI is delivered to the terminal, and the terminal uses the first PMI for data transmission.
  • the base station can actively initiate the PMI selection when needed, without relying on the sounding signal sent by the terminal, so as to improve the accuracy of the PMI selection and improve the performance gain of the SU-MIMO.
  • the receiving unit 72 may be a receiver of the base station, and the sending unit 71 may be a transmitter of the base station; in addition, the receiving unit 72 and the sending unit 71 may also be integrated.
  • the selecting unit 73 may be a separately set processor, or may be integrated in a processor of the base station, or may be stored in a memory of the base station in the form of program code, and is called and executed by a processor of the base station. The function of the above selection unit.
  • the processor described herein may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated systems configured to implement embodiments of the present invention. Circuit.
  • the embodiment of the present invention further provides a terminal.
  • the terminal includes:
  • the receiving unit 81 is configured to receive indication information sent by the base station.
  • the base station may periodically or periodically send the indication information.
  • the indication information received by the receiving unit 81 is sent by the base station when demodulating a reference signal.
  • the transmission period of the indication information is smaller than the transmission period of the detection signal of the terminal.
  • the processing unit 82 is configured to obtain, according to the indication information received by the receiving unit 81, unauthenticated uplink data or uplink data weighted by the unit matrix.
  • the sending unit 83 is configured to send the uplink data obtained by the processing unit 82 to the base station.
  • the receiving unit 81 is further configured to receive a first PMI sent by the base station, where the first PMI is selected by the base station according to the uplink data sent by the sending unit 83 from a PMI set of the base station.
  • the indication information received by the receiving unit 81 is a second PMI, and the second PMI is a PMI corresponding to the unit matrix codebook in the PMI set of the base station; and the processing unit 82 is specifically configured to: And selecting, by the second PMI, the unit matrix codebook corresponding to the second PMI; and weighting the uplink data by using the unit matrix codebook corresponding to the second PMI, to obtain uplink data weighted by the unit matrix.
  • the above receiving unit 81 may be a receiver of the terminal, and the transmitting unit 83 may be a transmitter of the terminal; in addition, the receiving unit 81 and the transmitting unit 83 may be integrated to form a transceiver of the terminal.
  • the processing unit 82 may be a separately set processor, or may be integrated in a processor of the terminal, or may be stored in the memory of the terminal in the form of program code, and is called and executed by a certain processor of the terminal.
  • the processor may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.
  • CPU Central Processing Unit
  • ASIC Application Specific Integrated Circuit
  • the base station sends the indication information to the terminal, and the terminal sends the uplink data to the base station according to the indication information by using the unit matrix weighted or not, and the PMI of the base station according to the received uplink data.
  • the first PMI is selected and sent to the terminal, and the terminal uses the first PMI to perform data transmission.
  • the base station can actively initiate the PMI selection when needed, without relying on the sounding signal sent by the terminal, so as to improve the accuracy of the PMI selection, thereby improving the performance gain of the SU-MIMO.
  • FIG. 9 is a schematic structural diagram of another embodiment of a base station according to the present invention.
  • the base station includes a receiver 91, a transmitter 92, a memory 93, and a processor 94.
  • the receiver 91, the transmitter 92, and the memory 93 are all connected to the processor 94, for example, via a bus.
  • the base station may also include a common component such as an antenna, a baseband processing component, a medium-frequency processing component, and an input/output device, and the embodiment of the present invention is not limited thereto.
  • Receiver 91 and transmitter 92 can be integrated to form a transceiver.
  • the memory 93 is for storing executable program code, the program code including computer operation instructions, and the memory 93 may also store a PMI set of the base station and a matrix codebook corresponding to each PMI in the PMI set.
  • Memory 93 may contain high speed RAM memory and may also include non-volatile memory, such as at least one disk memory.
  • the processor 94 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.
  • CPU Central Processing Unit
  • ASIC Application Specific Integrated Circuit
  • the receiver 91 is configured to receive uplink data sent by the terminal.
  • the transmitter 92 is configured to send indication information to the terminal, where the indication information is used to indicate that the terminal does not grant or use the unit matrix weighting to send uplink data.
  • the processor 94 is configured to select the first PMI from the PMI set of the base station according to the uplink data received by the receiver 91.
  • the first PMI is transmitted to the terminal through the transmitter 92.
  • the base station in this embodiment sends the indication information to the terminal, and the terminal sends the uplink data to the base station according to the indication information unweighted or weighted by the unit matrix, and selects the first from the PMI set of the base station according to the received uplink data.
  • the PMI is delivered to the terminal, and the terminal uses the first PMI for data transmission.
  • the base station can actively initiate the PMI selection when needed, without relying on the sounding signal sent by the terminal, so as to improve the accuracy of the PMI selection, thereby improving the performance gain of the SU-MIMO.
  • FIG. 10 it is a schematic structural diagram of another embodiment of a terminal according to the present invention.
  • the terminal includes a receiver 1001, a transmitter 1002, a memory 1003, and a processor 1004.
  • the receiver 1001, the transmitter 1002, and the memory 1003 are all connected to the processor 1004, for example, may be connected through a bus.
  • the terminal may also include a common component such as an antenna, a baseband processing component, a medium-frequency processing component, and an input/output device, and the embodiment of the present invention is not limited thereto.
  • Receiver 1001 and transmitter 1002 can be integrated to form a transceiver.
  • the memory 1003 is configured to store executable program code, where the program code includes computer operation instructions, and uplink data to be sent, and is also used to store a PMI set of the terminal and a matrix codebook corresponding to each PMI in the PMI set, and the base station The PMI collection is consistent.
  • the memory 1003 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.
  • the processor 1004 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.
  • CPU Central Processing Unit
  • ASIC Application Specific Integrated Circuit
  • the receiver 1001 is configured to receive indication information sent by the base station.
  • the indication information is used to indicate that the terminal does not weight or use the unit matrix weight to send uplink data.
  • the receiver 1001 is further configured to receive a first PMI sent by the base station, where the first PMI is selected by the base station from a PMI set of the base station.
  • the processor 1004 is configured to perform data processing on the uplink data to be transmitted according to the indication information received by the receiver 1001, to obtain unweighted uplink data or uplink data weighted by the unit matrix.
  • the unweighted uplink data or the uplink data weighted by the unit matrix is transmitted by the transmitter 1002. Send to the base station.
  • the terminal in this embodiment receives the indication information sent by the base station, and the terminal sends the uplink data to the base station according to the indication information unweighted or weighted by the unit matrix, and selects the PMI set from the base station according to the received uplink data.
  • a PMI is sent to the terminal, and the terminal uses the first PMI for data transmission.
  • the base station can actively initiate the PMI selection when needed, without relying on the sounding signal sent by the terminal, so as to improve the accuracy of the PMI selection, thereby improving the performance gain of the SU-MIMO.

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Abstract

本发明实施例提供一种选择预编码矩阵指示的方法、装置及系统,应用于通讯领域,用于解决现有技术中PMI选择不准确,最终导致系统的性能下降的问题。本发明提供的技术方案包括:基站向终端发送指示信息,指示终端不加权或釆用单位矩阵加权的发送上行数据,基站根据终端发送的上行数据从PMI集合中选出合适的PMI发送至终端。

Description

一种选 ^编码矩阵指示的方法、 装置及系统 技术领域 本发明涉及通信领域, 尤其涉及一种选择预编码矩阵指示的方法、 装置 及系统。
背景技术 上行 SU-MIMO ( Single User Multiple Input Multiple Output, 单用户多输 入多输出 )传输可以通过选择适合的 PMI (Precoding Matrix Indication, 预编 码矩阵指示)达到使传输性能得到提升的目的。
基站接收终端周期发送的探测 (sounding )信号, 在接收到探测信号后, 通过导频信号对探测信号进行解析, 得到信道响应, 根据 PMI选择准则, 对 得到的信道响应做数据处理, 从备选 PMI集合中选择合适的 PMI, 并将选择 下发给终端。
在实现上述方案的过程中, 现有技术中至少存在如下问题:
现有技术中 PMI 的选择是基于 sounding 测量进行的。 终端是否支持 sounding发送, sounding的测量周期, 或频带资源等问题会影响 PMI选择的 准确性, 从而影响 SU-MIMO的性能增益。
发明内容
本发明的实施例提供一种选择预编码矩阵指示的方法、 装置及系统用于 解决现有技术中 PMI选择不准确, 导致系统性能下降的问题。
为达到上述目的, 本发明的实施例釆用如下技术方案:
第一方面, 提供一种选择预编码矩阵指示的方法, 包括: 基站向终端发送 指示信息, 所述指示信息用于指示所述终端不加权或釆用单位矩阵加权发送 上行数据; 接收所述终端发送的所述上行数据; 根据所述上行数据从所述基 站的预编码矩阵指示 PMI集合中选择第一 PMI; 将所述第一 PMI发送至所述 终端。
在第一方面的第一种可能的实现方式中, 所述指示信息为第二 PMI, 所 述第二 PMI为所述基站的 PMI集合中的单位矩阵码本对应的 PMI; 且所述上 行数据为所述终端根据所述第二 PMI对应的单位矩阵码本进行加权发送的上 行数据。
结合第一方面或第一方面的第一种可能的实现方式, 在第二种可能的实 现方式中, 所述基站向终端发送指示信息, 包括: 非周期性向所述终端发送 所述指示信息。
结合第一方面的第二种可能的实现方式, 在第三种可能的实现方式中, 非周期性向所述终端发送所述指示信息, 包括: 在解调参考信号时, 向所述 终端发送所述指示信息。
结合第一方面或第一方面的第一种可能的实现方式, 在第四种可能的实 现方式中, 所述基站向终端发送指示信息, 包括: 周期性向所述终端发送所 述指示信息。
结合第一方面的第四种可能, 在第五种可能的实现方式中, 所述指示信 息的发送周期小于所述终端的探测信号的发送周期。
第二方面, 提供一种选择预编码矩阵指示的方法, 包括: 终端接收基站 发送的指示信息; 根据所述指示信息, 向基站发送不加权的上行数据或釆用 单位矩阵加权的上行数据; 接收所述基站发送的第一预编码矩阵指示 PMI, 该第一 PMI是所述基站根据所述终端发送的上行数据从所述基站的 PMI集合 中选择的。
在第二方面的第一种可能的实现方式中, 所述指示信息为第二 PMI, 所 述第二 PMI为所述基站 PMI集合中的单位矩阵码本对应的 PMI; 且所述根据 所述指示信息, 向基站发送不加权的上行数据或釆用单位矩阵加权的上行数 据, 包括: 根据所述第二 PMI, 选择所述第二 PMI对应的单位矩阵码本; 利 用所述第二 PMI对应的单位矩阵码本对上行数据进行加权; 向所述基站发送 加权后的上行数据。
结合第二方面或第二方面的第一种可能的实现方式, 在第二种可能的实 现方式中 , 所述指示信息由所述基站在解调参考信号时发送。
结合第二方面或第二方面的第一种可能的实现方式, 在第三种可能的实 现方式中, 所述指示信息由所述基站周期性的发送。
结合第二方面的第三种可能的实现方式, 在第四种可能的实现方式中, 所述指示信息的发送周期小于所述终端的探测信号的发送周期。
第三方面, 提供一种基站, 包括:
发送单元, 用于向终端发送指示信息, 所述指示信息用于指示所述终端 不加权或釆用单位矩阵加权发送上行数据;
接收单元, 用于接收所述终端发送的所述上行数据;
选择单元, 用于根据所述接收单元接收的所述上行数据从所述基站的预 编码矩阵指示 PMI集合中选择第一 PMI;
所述发送单元,还用于将所述选择单元选择的第一 PMI发送至所述终端。 在第三方面的第一种可能的实现方式中, 所述发送单元发送的所述指示 信息为第二 PMI, 所述第二 PMI为所述基站的 PMI集合中的单位矩阵码本对 应的 PMI; 且
所述接收单元接收的所述上行数据为所述终端根据所述第二 PMI对应的 单位矩阵码本进行加权发送的上行数据。
结合第三方面或第三方面的第一种可能的实现方式, 在第二种可能的实 结合第三方面的第二种可能的实现方式, 在第三种可能的实现方式中, 所述发送单元具体用于: 在解调参考信号时, 向所述终端发送所述指示信息。
结合第三方面或第三方面的第一种可能的实现方式, 在第四种可能的实 结合第三方面的第四种可能的实现方式, 在第三方面的第五种可能的实 现方式中, 所述指示信息的发送周期小于所述终端的探测信号的发送周期。
第四方面, 提供一种终端, 包括:
接收单元, 用于接收基站发送的指示信息;
处理单元, 用于根据所述接收单元接收的所述指示信息, 得到不加权的 上行数据或釆用单位矩阵加权的上行数据;
发送单元, 用于向基站发送所述处理单元得到的所述上行数据; 所述接收单元, 进一步用于接收所述基站发送的第一预编码矩阵指示
PMI, 该第一 PMI是所述基站根据所述发送单元发送的上行数据从所述基站 的 PMI集合中选择的。
在第三方面的第一种可能的实现方式中, 所述接收单元接收的所述指示 信息为第二 PMI , 所述第二 PMI为所述基站 PMI集合中的单位矩阵码本对应 的 PMI; 且所述处理单元, 具体用于:
根据所述第二 PMI, 选择所述第二 PMI对应的单位矩阵码本;
利用所述第二 PMI对应的单位矩阵码本对上行数据进行加权, 得到釆用 单位矩阵加权的上行数据。
结合第四方面或第四方面的第一种可能的实现方式, 在第二种可能的实 现方式中 , 所述指示信息由所述基站在解调参考信号时发送。
结合第四方面或第四方面的第一种可能的实现方式, 在第三种可能的实 现方式中, 所述指示信息由所述基站周期性的发送。
结合第四方面的第三种可能的实现方式, 在第四种可能的实现方式中, 所述指示信息的发送周期小于所述终端的探测信号的发送周期。
第五方面, 本发明提供一种计算机程序产品, 包括计算机可读介质, 所 述计算机可读介质包括一组程序代码, 用于执行如第一方面或第一方面中任 意一种可能的实现方式所述的方法。
第六方面, 一种计算机程序产品, 包括计算机可读介质, 所述计算机可 读介质包括一组程序代码, 用于执行如第二方面或第二方面中任意一种可能 的实现方式所述的方法。
本发明实施例提供的一种选择预编码矩阵指示的方法、 装置及系统, 基 站向终端发送单位矩阵指示信息, 所述终端根据单位矩阵指示信息釆用单位 矩阵加权或不加全的发送上行数据, 基站根据接收的上行数据从基站的 PMI 集合中选出第一 PMI并下发至终端, 所述终端使用所述第一 PMI进行数据传 输。 与现有技术相比, 基站可以在需要时主动发起 PMI的选择, 而不需要依 赖终端发送的 sounding信号,以提高 PMI选择的准确性,进而提高 SU-MIMO 的性能增益。 附图说明 图 1为本发明实施例提供的一种选择 PMI的方法信令图;
图 2为本发明另一实施例提供的一种选择 PMI的方法信令图;
图 3为本发明实施例提供的一种选择 PMI的方法流程图;
图 4为本发明实施例提供的一种选择 PMI的方法流程图;
图 5为本发明另一实施例提供的一种选择 PMI的方法流程图;
图 6为本发明又一实施例提供的一种选择 PMI的方法信令图;
图 7为本发明实施例提供的一种基站的结构示意图;
图 8为本发明实施例提供的一种终端的结构示意图;
图 9为本发明又一实施例提供的一种基站的结构示意图;
图 10为本发明又一实施例提供的一种终端的结构示意图。 具体实施方式 下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而 不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有作 出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。 目前, PMI的选择是基于 sounding测量进行的, 终端是否支持 sounding 发送, sounding的测量周期, 或频带资源等问题会影响 PMI选择的准确性, 从而影响 SU-MIMO 的性能增益。 为此, 以下实施例提供了不依赖 sounding 选择 PMI的方法, 基站可以在需要时主动发起 PMI的选择, 而不需要依赖终 端发送的 sounding信号, 以提高 PMI选择的准确性, 进而提高 SU-MIMO的 性能增益。
例如, 基站可以指示终端釆用单位矩阵加权或不加权发送上行数据, 即 相当于釆用了单位矩阵加权的信道或者未加权的信道发送上行数据, 此时的 信道未引入影响 PMI测量的码本信息 (除单位矩阵码本以外的码本)。 因此, 基站可以根据此时得到的信道响应, 选择合适的 PMI, 下发给终端。
下面结合附图和实施例佯细描述以上过程, 且以下一些细节描述是为了 使本领域技术人员更加明了本发明实施例的技术方案、 优点和效果, 并非用 以限制本发明。 另外, 本发明实施例提供的选择 PMI的方法可以和现有的基 于 sounding测量选择 PMI的方法结合使用, 本发明实施例不做任何限制。
请参考图 1 , 其为本发明实施例提供的一种选择 PMI的方法的信令图, 如图 1所示, 包括如下步骤:
步骤 101 : 基站向终端发送指示信息, 该指示信息用于指示终端不加权或 釆用单位矩阵加权发送上行数据。
步骤 102: 终端根据以上指示信息, 不加权或釆用单位矩阵加权发送上行 数据。
步骤 103:基站根据终端发送的上行数据,从基站的 PMI集合中选择 PMI。 步骤 104: 基站将选择的 PMI下发给终端。
在以上实施例中, 基站可以在需要时向终端下发指示信息, 从而主动发 起 PMI的选择, 而不需要依赖终端发送的 sounding信号, 以提高 PMI选择的 准确性, 进而提高 SU-MIMO 的性能增益。 由于釆用单位矩阵加权或不加权 发送上行数据, 此时的信道由于未引入影响 PMI测量的码本信息 (除单位矩 阵码本以外的码本)。 因此, 基站可以根据此时得到的信道响应, 选择合适的 PMI, 下发给终端, 使得终端可以釆用更为准确的 PMI加权发送上行数据, 以提高 SU-MIMO的性能增益。
在以上步骤 101 中, 基站可以釆用周期性或非周期性发送的方式, 发送 指示信息。
例如,非周期性的发送方式中: 可以在解调参考信号时(以下称为 DMRS 时刻), 向终端发送指示信息。
现有技术中, 在 sounding的每个测量周期, 信道是不进行 PMI码本加权 的, 而在 DMRS时刻, 信道已经进行了 PMI码本加权, 此时的信道也即包含 了码本信息, 而包含了码本信息的信道, 基站是无法进行 PMI测量的。 因此 在 DMRS时刻如果还釆用现有技术的方案,基站是无法利用 DMRS时刻的信 道进行 PMI选择的。 而在 DMRS时刻, 釆用以上实施例提供的方法, 可以有 效的解决 DMRS时刻无法进行 PMI选择的问题。
另外, 可以进一步考虑信道的质量, 选择一个信道质量比较好的时刻, 触发以上 PMI选择过程, 发送指示信息。 例如, 根据终端的测量, 判断信噪 比是否满足预设条件, 例如, 信噪比大于某个门限值。 当然, 这只是一种策 略的举例, 并非用以限制本发明, 本领域技术人员可以根据需要, 选择其他 的策略作为基站主动发起 PMI选择的时刻。
再如, 周期性的发送方式中: 以上指示信息的发送周期可以小于终端 sounding信号的发送周期。
现有技术中, PMI选择的准确性受到 sounding测量周期的影响, 预设的 测量周期越长, 测量的间隔越大, PMI 的选择越不准确。 而将指示信息的发 送周期设定为小于 sounding的测量周期,可以进一步提高 PMI选择的准确性。 当然, 考虑到终端侧能源的消耗, 指示信息的发送周期也不适于过小, 本领 域技术人员可以根据需要进行设置。
此外, 指示信息的发送周期也可以不受 sounding的测量周期大小限制, 例如, 在终端不支持 sounding信号发送时; 或者将这种方式的与现有的基于 sounding测量选择 PMI的方法相结合;或者与非周期性发送的方式相结合等。 本发明实施例不做任何限制。
以上步骤 103中, 基站选择 PMI为本领域技术人员所熟知的技术, 在此 不再佯述, 后面会通过一个实施例中的一种系统性能最优目标准则举例进行 佯细描述, 但是并非用以限制本发明, 且本发明的改进点不在于此, 本领域 技术人员可以釆用任何一种现有技术或将来产生的 PMI选择算法进行选择。
另外, 在以上步骤 101 中, 基站发送的指示信息可以仅仅是一个指示信 令, 用于指示终端釆用单位矩阵加权或不加权发送上行数据。 此外, 基站发 送的指示信息也可以是 PMI, 该 PMI对应基站 PMI集合中的单位矩阵码本 (即, 单位矩阵), 用于指示终端釆用该 PMI对应的单位矩阵码本进行加权发 送上行数据, 这种情况下为了区分和步骤 103中选择的 PMI, 将步骤 103 中 的 PMI称为第一 PMI, 步骤 101中发送的 PMI称为第二 PMI。 具体, 请参考 图 2, 其为本发明另一实施例提供的一种选择 PMI的方法信令图, 如图 2所 示, 包括如下步骤:
步骤 201: 基站向终端发送第二 PMI , 该第二 PMI为基站的 PMI集合中 的单位矩阵码本(简称为单位码本)对应的 PMI。
步骤 202: 终端根据第二 PMI选择单位矩阵码本进行加权, 得到上行数 据。
例如, 信道的矩阵为 H, 终端根据第二 PMI选择单位矩阵码本为 I, 待发 送的上行数据为 X, 则加权后发送的上行数据 Y为:
Y=I*H*X。
步骤 203 : 终端向基站发送上行数据。
步骤 204: 基站根据接收的上行数据从基站的 PMI集合中选择第一 PMI。 步骤 205: 基站将选择的第一 PMI下发给终端。
本实施例相对于图 1 所示的实施例, 可以与现有协议兼容, 并达到提高 PMI选择准确性的目的。
关于第二 PMI的发送形式同以上实施例的描述, 在此不再赘述。
如图 3所示, 其为本发明实施例提供的一种选择 PMI的方法流程图, 涉 及基站一侧, 包括:
步骤 301 : 向终端发送指示信息, 该指示信息用于指示终端不加权或釆用 单位矩阵加权发送上行数据。
其中, 基站可以周期性的发送指示信息, 也可以非周期的发送指示信息。 具体, 同以上实施例的描述, 在此不再赘述。
步骤 302: 接收所述终端发送的上行数据。
步骤 303: 根据所接收的上行数据从基站的 PMI集合中选择第一 PMI; 步骤 304: 将第一 PMI发送至终端。
关于步骤 303, 即基站选择第一 PMI的方法, 举例描述如下: 然而, 这 仅是一种示例, 并非用以限制本发明。 具体, 请参考图 4, 包括如下步骤: 步骤 3031 :对上行数据进行信道估计以获得调度带宽上的信道响应集合。 在一示例中, 可以通过 DMRS ( DeModulation Reference Signal, 解调参 考信号)对上行数据进行信道估计。
其中所述信道响应集合中包含若干信道矩 P车,例如, H, 、 H2、 ¾ Hm, m为信道矩阵的个数,为正整数,每个信道矩阵对应一个 RB( Resource Block, 资源块)。 且每个信道矩阵反应每个 RB上的信道状态信息。
步骤 3032:将基站的 PMI集合中每个 PMI与信道响应集合中每个信道矩 阵根据系统性能最优目标准则进行数据处理, 得到衡量值, 最大衡量值对应 的 PMI即为被选择的第一 PMI。
例如, 以上 PMI集合是由 3GPP TS 36.211 ( The 3rd Generation Partnership Project Technology Specification 36.211 ,第三代合作伙伴项目技术协议 36.211 ) 规定的 PMI集合。
所述系统性能最优目标准则包括: 接收信号功率最大化准则, 或系统吞 吐量最大化准则等。
在本实施例中, 以所述接收信号功率最大化准则为例做佯细说明: 所述 PMI集合中包含 n个 PMI, PMIj , PMI2、 PMI3 PMIn, 其中 n 为正整数。 根据所述接收信号功率最大化准则对所述 PMI集合与信道响应集合进行 数据处理, 如下:
IPMIj Hil+IPMIj Η2|+|ΡΜΐ! H3|+ ...... +|PMIi Hm|=S! ;
|PMI2 Hil+IPMIa H2|+|PMI2 H3|+ ...... +|PMI2 Hm|=S2;
|PMI3 H!|+|PMI3 H2|+|PMI3 H3|+ ...... +|PMI3 Hm|=S3;
|PMIn x Hil+IPMIn x H2|+|PMIn x H3|+ ...... +|PMIn x Hm|=Si;
将所述 PMI集合中每个 PMI与所述信道响应集合中每个信道矩阵相乘, 得到衡量值矩阵, 计算所述衡量值矩阵的模值, 将所述模值进行相加得到所 述每个 PMI对应的衡量值。
其中, 所述 Si 、 S2、 S3 分别为衡量值 1、 衡量值 2、 衡量值 3...... 衡量值 i,对得到的每一个衡量值做比较,其中数值最大的衡量值所对应的 PMI 即为被选择的第 ― PMI。
与如图 3所示的方法相对应地, 如图 5所示本发明另一实施例还提供的 一种选择 PMI的方法, 涉及终端一侧, 包括:
步骤 501: 接收基站发送的第二 PMI , 所述第二 PMI为所述基站 PMI集 合中的单位矩阵码本(简称为单位码本)对应的 PMI。
在本实施例中, 指示信息为 PMI, 即所述第二 PMI。
同以上实施例对指示信息的描述, 所述第二 PMI由基站周期性或非周期 性发送。 当第二 PMI是非周期性发送时, 发送时刻可以为解调参考信号时, 即 DMRS时刻。 当第二 PMI是周期性发送时, 其发送周期可以小于所述终端 的探测信号的发送周期。
步骤 502: 终端根据第二 PMI, 选择第二 PMI对应的单位矩阵码本。 并 利用选择的单位矩阵码本对上行数据进行加权。 例如, 设: 信道的矩阵为 H, 终端根据第二 PMI选择的单位矩阵码本为 I,待发送的上行数据为 X, 则加权 后发送的上行数据 Y为:
Y=I*H*X。 步骤 503: 终端向基站发送加权后的上行数据。
步骤 504: 接收基站发送的第一 PMI, 该第一 PMI是基站根据终端发送 的上行数据从基站的 PMI集合中选择的。
从而, 终端便可以利用基站选择的第一 PMI加权发送上行数据。
其中, 选择第一 PMI的方式如图 4的举例, 此处不再赘述。
为了使本领域技术人员能够更清楚地理解本发明实施例提供的技术方 案, 下面通过具体的实施例, 对本发明实施例提供的一种选择 PMI的方法进 行伴细说明。
如图 6所示, 本发明又一实施例提供的一种选择 PMI的方法, 包括: 步骤 601: 向终端发送单位矩阵码本对应的 PMI。
其中, 所述 PMI为基站中 PMI集合中的单位矩阵码本对应的 PMI。 基站 可以周期性的发送该 PMI, 也可以不定期的发送该 PMI。
此外 , 可以通过 PDCCH发送该单位矩阵码本对应的 PMI。
步骤 602: 所述终端接收所述基站发送的单位矩阵码本对应的 PMI。
步骤 603: 所述终端根据所述单位矩阵码本对应的 PMI,选择单位矩阵码 本与需传输的数据进行加权得到加权信号。
步骤 604: 所述终端将所述加权信号发送至所述基站。
步骤 605: 所述基站对所述加权信号进行信道估计得到信道响应集合。 其中, 具体通过 DMRS ( DeModulation Reference Signal, 解调参考信号 ) 对所述加权信号进行信道估计。
具体的, 4 设所述信道响应集合中包含 4个信道矩阵 H, 、 H2、 H3
H4, 每个信道矩阵 H对应一个 RB。
其中, 所述信道矩阵 H为每个 RB上的信道状态信息。
步骤 606: 对所述 PMI集合中每个 PMI与所述信道响应集合中每个信道 矩阵 H根据系统性能最优目标准则进行数据处理得到衡量值, 最大衡量值对 应的 PMI即为被选择的 PMI。
本发明实施例中的 PMI集合是由 3GPP TS 36.211 ( The 3rd Generation Partnership Project Technology Specification 36.211 , 第三代合作伙伴项目技术 协议 36.211 )规定的。
其中, 所述系统性能最优目标准则包括: 接收信号功率最大化准则, 系 统吞吐量最大化准则等。
在本实施例中, 以所述接收信号功率最大化准则为例做佯细说明: 设, 所述 PMI集合中包含 4个 PMI, PMIj , PMI2、 PMI3、 PMI4
其中, 根据所述接收信号功率最大化准则对所述 PMI集合与信道响应集 合进行数据处理, 具体的:
IPMIj Hil+IPMIj H2|+|PMl! H3|+|PMl! H4|=S!;
|PMI2 Hil+IPMIa H2|+|PMI2 H3|+|PMI2 H4|=S2;
|PMI3 H!|+|PMI3 H2|+|PMI3 H3|+|PMI3 H4|=S3;
|PMI4 H!|+|PMI4 H2|+|PMI4 H3|+|PMI4 H4|=S4;
将所述 PMI集合中每个 PMI与所述信道响应集合中每个信道矩阵 H相 乘, 得到衡量值矩阵, 计算所述衡量值矩阵的模值, 将所述模值进行相加得 到所述每个 PMI对应的衡量值。
其中, 所述 Si 、 S2、 S3、 S4分别为衡量值 1、 衡量值 2、 衡量值 3、 衡量 值 4, 对得到的每一个衡量值做比较, 假定其中数值最大的衡量值为 S3, 则 S3所对应的 PMI3即为被选择的 PMI。
步骤 607: 将所述被选择的 PMI发送至所述终端。
步骤 608: 所述终端接收所述被选择的 PMI, 以便终端使用合适的 PMI 进行数据传输。
可见, 在本实施例提供的选择 PMI的方法中,基站向终端发送指示信息, 所述终端根据指示信息不加权或釆用单位矩阵加权的发送上行数据, 基站根 据接收的上行数据从基站的 PMI集合中选出第一 PMI并下发至终端, 所述终 端使用所述第一 PMI进行数据传输。 与现有技术相比, 基站可以在需要时主 动发起 PMI的选择, 而不需要依赖终端发送的 sounding信号, 以提高 PMI 选择的准确性, 进而提高 SU-MIMO的性能增益。 与上述方法相对应地, 如图 7 所示, 本发明实施例还提供一种基站, 包 括:
发送单元 71 : 用于向终端发送指示信息。
其中, 所述指示信息用于指示所述终端不加权或釆用单位矩阵加权发送 上行数据。
发送单元 71 具体用于: 周期性或非周期性向所述终端发送所述指示信 息。 例如, 非周期性发送指示信息的情况下, 可以在解调参考信号时, 向所 述终端发送所述指示信息。 再如, 周期性发送指示信息的情况下, 所述指示 信息的发送周期小于所述终端向所述基站发送探测信号的周期, 该探测信号 的发送周期通常由基站设定。
接收单元 72: 用于接收所述终端发送的所述上行数据。
选择单元 73: 用于根据所述接收单元接收的所述上行数据从所述基站的 预编码矩阵指示 PMI集合中选择第一 PMI。
所述发送单元 71还用于将所述选择单元 73选择的第一 PMI发送至所述 终端。
具体的,所述发送单元 71发送的所述指示信息为第二 PMI,所述第二 PMI 为所述基站的 PMI 集合中的单位矩阵码本对应的 PMI; 且所述接收单元 72 接收的所述上行数据为所述终端根据所述第二 PMI对应的单位矩阵码本进行 加权发送的上行数据。
可见, 在本实施例中, 基站向终端发送指示信息, 所述终端根据指示信 息不加权或釆用单位矩阵加权向基站发送上行数据, 根据接收的上行数据从 基站的 PMI集合中选出第一 PMI并下发至终端, 所述终端使用所述第 ― PMI 进行数据传输。 与现有技术相比, 基站可以在需要时主动发起 PMI的选择, 而不需要依赖终端发送的 sounding信号, 以提高 PMI选择的准确性, 进而提 高 SU-MIMO的性能增益。
需要说明的是, 以上接收单元 72可以为基站的接收机, 发送单元 71可 以为基站的发射机; 另外, 也可以将接收单元 72和发送单元 71集成在一起 构成基站的收发机。 选择单元 73可以为单独设立的处理器, 也可以集成在基 站的某一个处理器中实现, 此外, 也可以以程序代码的形式存储于基站的存 储器中, 由基站的某一个处理器调用并执行以上选择单元的功能。 这里所述 的处理器可以是一个中央处理器(Central Processing Unit, CPU ), 或者是特 定集成电路 ( Application Specific Integrated Circuit, ASIC ), 或者是被配置成 实施本发明实施例的一个或多个集成电路。
本发明实施例还提供一种终端, 如图 8所示, 该终端包括:
接收单元 81 : 用于接收基站发送的指示信息。
其中, 基站可以周期或非周期性发送所述指示信息, 例如, 所述接收单 元 81接收的所述指示信息由所述基站在解调参考信号时发送。 再如, 所述指 示信息的发送周期小于所述终端的探测信号的发送周期。
处理单元 82: 用于根据所述接收单元 81接收的所述指示信息,得到不加 权的上行数据或釆用单位矩阵加权的上行数据。
发送单元 83: 用于向基站发送所述处理单元 82得到的所述上行数据。 所述接收单元 81进一步用于接收所述基站发送的第一 PMI, 该第一 PMI 是所述基站根据所述发送单元 83发送的上行数据从所述基站的 PMI集合中选 择的。
其中, 所述接收单元 81接收的所述指示信息为第二 PMI, 所述第二 PMI 为所述基站 PMI集合中的单位矩阵码本对应的 PMI;且所述处理单元 82具体 用于: 根据所述第二 PMI, 选择所述第二 PMI对应的单位矩阵码本; 利用所 述第二 PMI对应的单位矩阵码本对上行数据进行加权, 得到釆用单位矩阵加 权的上行数据。
需要说明的是, 以上接收单元 81可以为终端的接收机, 发送单元 83可 以为终端的发射机; 另外, 也可以将接收单元 81和发送单元 83集成在一起 构成终端的收发机。 处理单元 82可以为单独设立的处理器, 也可以集成在终 端的某一个处理器中实现, 此外, 也可以以程序代码的形式存储于终端的存 储器中, 由终端的某一个处理器调用并执行以上处理单元的功能。 这里所述 的处理器可以是一个中央处理器(Central Processing Unit, CPU ), 或者是特 定集成电路 ( Application Specific Integrated Circuit, ASIC ), 或者是被配置成 实施本发明实施例的一个或多个集成电路。
本发明又一实施例提供的一种终端, 基站向终端发送指示信息, 所述终 端根据指示信息釆用单位矩阵加权或不加全的向基站发送上行数据, 根据接 收的上行数据从基站的 PMI集合中选出第一 PMI并下发至终端, 所述终端使 用所述第一 PMI进行数据传输。 与现有技术相比, 基站可以在需要时主动发 起 PMI的选择, 而不需要依赖终端发送的 sounding信号, 以提高 PMI选择的 准确性, 进而提高 SU-MIMO的性能增益。
如图 9所示, 为本发明基站另一实施例结构示意图, 该基站包括接收机 91、 发射机 92、 存储器 93和处理器 94。 其中, 接收机 91、 发射机 92、 和存 储器 93均与处理器 94连接, 例如, 可以通过总线连接。 当然, 基站还可以 包括天线、 基带处理部件、 中射频处理部件、 输入输出装置等通用部件, 本 发明实施例在此不再任何限制。
接收机 91和发射机 92可以集成在一起, 构成收发机。
存储器 93用于存储可执行的程序代码,该程序代码包括计算机操作指令, 存储器 93还可以存储基站的 PMI集合以及该 PMI集合中每个 PMI对应的矩 阵码本。 存储器 93可能包含高速 RAM存储器, 也可能还包括非易失性存储 器 ( non- volatile memory ) , 例如至少一个磁盘存 4渚器。
处理器 94可以是一个中央处理器(Central Processing Unit, CPU ) , 或 者是特定集成电路 ( Application Specific Integrated Circuit, ASIC ) , 或者是被 配置成实施本发明实施例的一个或多个集成电路。
其中, 接收机 91用于接收终端发送的上行数据。
发射机 92用于向终端发送指示信息, 该指示信息用于指示所述终端不加 权或釆用单位矩阵加权发送上行数据。
处理器 94用于根据接收机 91接收到的上行数据, 从所述基站的 PMI集 合中选择第 ― PMI。 通过发射机 92将第 ― PMI发送至终端。 可见, 本实施例的基站, 向终端发送指示信息, 所述终端根据指示信息 不加权或釆用单位矩阵加权的向基站发送上行数据, 根据接收的上行数据从 基站的 PMI集合中选出第一 PMI并下发至终端, 所述终端使用所述第 ― PMI 进行数据传输。 与现有技术相比, 基站可以在需要时主动发起 PMI的选择, 而不需要依赖终端发送的 sounding信号, 以提高 PMI选择的准确性, 进而提 高 SU-MIMO的性能增益。
如图 10所示, 为本发明终端另一实施例结构示意图, 该终端包括接收机 1001、 发射机 1002、 存储器 1003和处理器 1004。 其中, 接收机 1001、 发射 机 1002、 和存储器 1003均与处理器 1004连接, 例如, 可以通过总线连接。 当然, 终端还可以包括天线、 基带处理部件、 中射频处理部件、 输入输出装 置等通用部件, 本发明实施例在此不再任何限制。
接收机 1001和发射机 1002可以集成在一起, 构成收发机。
存储器 1003用于存储可执行程序代码,该程序代码包括计算机操作指令, 以及需要发送的上行数据, 还用于存储终端的 PMI集合以及该 PMI集合中每 个 PMI对应的矩阵码本, 其与基站的 PMI集合一致。 存储器 1003可能包含 高速 RAM存储器, 也可能还包括非易失性存储器( non- volatile memory ) , 例如至少一个磁盘存储器。
处理器 1004可以是一个中央处理器(Central Processing Unit, CPU ) , 或者是特定集成电路 ( Application Specific Integrated Circuit, ASIC ) , 或者是 被配置成实施本发明实施例的一个或多个集成电路。
其中, 接收机 1001用于接收基站发送的指示信息。 该指示信息用于指示 所述终端不加权或釆用单位矩阵加权发送上行数据。 接收机 1001还用于接收 基站发送的第一 PMI, 该第一 PMI是所述基站从所述基站的 PMI集合中选择 的。
处理器 1004用于根据接收机 1001接收到的指示信息, 对需要发送的上 行数据进行数据处理, 得到不加权的上行数据或釆用单位矩阵加权的上行数 据。 通过发射机 1002将不加权的上行数据或釆用单位矩阵加权的上行数据发 送至基站。
可见, 本实施例的终端, 接收基站发送的指示信息, 所述终端根据指示 信息不加权或釆用单位矩阵加权的向基站发送上行数据, 根据接收的上行数 据从基站的 PMI集合中选出第一 PMI并下发至终端, 所述终端使用所述第一 PMI进行数据传输。 与现有技术相比, 基站可以在需要时主动发起 PMI的选 择, 而不需要依赖终端发送的 sounding信号, 以提高 PMI选择的准确性, 进 而提高 SU-MIMO的性能增益。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围并不局限 于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易 想到变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护 范围应所述以权利要求的保护范围为准。

Claims

权利要求 书
1、 一种选择预编码矩阵指示的方法, 其特征在于, 包括:
基站向终端发送指示信息, 所述指示信息用于指示所述终端不加权或釆用 单位矩阵加权发送上行数据;
接收所述终端发送的所述上行数据;
根据所述上行数据从所述基站的预编码矩阵指示 PMI 集合中选择第一
PMI;
将所述第一 PMI发送至所述终端。
2、 根据权利要求 1所述的方法, 其特征在于, 所述指示信息为第二 PMI, 所述第二 PMI为所述基站的 PMI集合中的单位矩阵码本对应的 PMI; 且
所述上行数据为所述终端根据所述第二 PMI对应的单位矩阵码本进行加权 发送的上行数据。
3、 根据权利要求 1或 2所述的方法, 其特征在于, 所述基站向终端发送指 示信息, 包括: 非周期性向所述终端发送所述指示信息。
4、 根据权利要求 3所述的方法, 其特征在于, 非周期性向所述终端发送所 述指示信息, 包括:
在解调参考信号时, 向所述终端发送所述指示信息。
5、 根据权利要求 1或 2所述的方法, 其特征在于, 所述基站向终端发送指 示信息, 包括:
周期性向所述终端发送所述指示信息。
6、 根据权利要求 5所述的方法, 其特征在于, 所述指示信息的发送周期小 于所述终端的探测信号的发送周期。
7、 一种选择预编码矩阵指示的方法, 其特征在于, 包括:
终端接收基站发送的指示信息;
根据所述指示信息, 向基站发送不加权的上行数据或釆用单位矩阵加权的 上行数据;
接收所述基站发送的第一预编码矩阵指示 PMI, 该第一 PMI是所述基站根 据所述终端发送的上行数据从所述基站的 PMI集合中选择的。
8、 根据权利要求 7所述的方法, 其特征在于, 所述指示信息为第二 PMI, 所述第二 PMI为所述基站 PMI集合中的单位矩阵码本对应的 PMI; 且所述根据 所述指示信息, 向基站发送不加权的上行数据或釆用单位矩阵加权的上行数据, 包括:
根据所述第二 PMI, 选择所述第二 PMI对应的单位矩阵码本;
利用所述第二 PMI对应的单位矩阵码本对上行数据进行加权;
向所述基站发送加权后的上行数据。
9、 根据权利要求 7或 8所述的方法, 其特征在于, 所述指示信息由所述基 站在解调参考信号时发送。
10、 根据权利要求 7或 8所述的方法, 其特征在于, 所述指示信息由所述 基站周期性的发送。
11、 根据权利要求 10所述的方法, 其特征在于, 所述指示信息的发送周期 'J、于所述终端的探测信号的发送周期。
12、 一种基站, 其特征在于, 包括:
发送单元, 用于向终端发送指示信息, 所述指示信息用于指示所述终端不 加权或釆用单位矩阵加权发送上行数据;
接收单元, 用于接收所述终端发送的所述上行数据;
选择单元, 用于根据所述接收单元接收的所述上行数据从所述基站的预编 码矩阵指示 PMI集合中选择第一 PMI;
所述发送单元, 还用于将所述选择单元选择的第一 PMI发送至所述终端。
13、 根据权利要求 12所述的基站, 其特征在于, 所述发送单元发送的所述 指示信息为第二 PMI, 所述第二 PMI为所述基站的 PMI集合中的单位矩阵码本 对应的 PMI; 且
所述接收单元接收的所述上行数据为所述终端根据所述第二 PMI对应的单 位矩阵码本进行加权发送的上行数据。
14、 根据权利要求 12或 13所述的基站, 其特征在于, 所述发送单元具体 用于非周期性向所述终端发送所述指示信息。
15、 根据权利要求 14所述的基站, 其特征在于, 所述发送单元具体用于: 在解调参考信号时, 向所述终端发送所述指示信息。
16、 根据权利要求 12或 13所述的基站, 其特征在于, 所述发送单元具体 用于周期性向所述终端发送所述指示信息。
17、 根据权利要求 16所述的基站, 其特征在于, 所述指示信息的发送周期 'J、于所述终端的探测信号的发送周期。
18、 一种终端, 其特征在于, 包括:
接收单元, 用于接收基站发送的指示信息;
处理单元, 用于根据所述接收单元接收的所述指示信息, 得到不加权的上 行数据或釆用单位矩阵加权的上行数据;
发送单元, 用于向基站发送所述处理单元得到的所述上行数据;
所述接收单元, 进一步用于接收所述基站发送的第一预编码矩阵指示 PMI, 该第一 PMI是所述基站根据所述发送单元发送的上行数据从所述基站的 PMI集 合中选择的。
19、 根据权利要求 18所述的终端, 其特征在于, 所述接收单元接收的所述 指示信息为第二 PMI, 所述第二 PMI为所述基站 PMI集合中的单位矩阵码本对 应的 PMI; 且所述处理单元, 具体用于:
根据所述第二 PMI, 选择所述第二 PMI对应的单位矩阵码本;
利用所述第二 PMI对应的单位矩阵码本对上行数据进行加权, 得到釆用单 位矩阵加权的上行数据。
20、 根据权利要求 18或 19所述的终端, 其特征在于, 所述指示信息由所 述基站在解调参考信号时发送。
21、 根据权利要求 18或 19所述的终端, 其特征在于, 所述指示信息由所 述基站周期性的发送。
22、 根据权利要求 21所述的终端, 其特征在于, 所述指示信息的发送周期 'J、于所述终端的探测信号的发送周期。
23、 一种计算机程序产品, 包括计算机可读介质, 所述计算机可读介质包 括一组程序代码, 用于执行如权利要求 1-6中任意一项所述的方法。
24、 一种计算机程序产品, 包括计算机可读介质, 所述计算机可读介质包 括一组程序代码, 用于执行如权利要求 7-11中任意一项所述的方法。
PCT/CN2013/081938 2013-08-21 2013-08-21 一种选择预编码矩阵指示的方法、装置及系统 WO2015024210A1 (zh)

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