WO2014181444A1 - 移動局及び報告方法 - Google Patents
移動局及び報告方法 Download PDFInfo
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- WO2014181444A1 WO2014181444A1 PCT/JP2013/063088 JP2013063088W WO2014181444A1 WO 2014181444 A1 WO2014181444 A1 WO 2014181444A1 JP 2013063088 W JP2013063088 W JP 2013063088W WO 2014181444 A1 WO2014181444 A1 WO 2014181444A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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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
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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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
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
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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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0478—Special codebook structures directed to feedback optimisation
- H04B7/0479—Special codebook structures directed to feedback optimisation for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]
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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
- H04B7/0617—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 for beam forming
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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
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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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
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
Definitions
- the present invention relates to a mobile station and a reporting method.
- a communication control procedure called closed-loop precoding is used in a downlink (DL).
- the downlink is a line from the base station (eNB: eNodeB) to the mobile station (UE: User Equipment).
- eNB eNodeB
- UE User Equipment
- closed loop precoding a base station uses a plurality of antennas (that is, multi-antennas) to form a directional beam.
- closed-loop precoding spatial multiplexing that simultaneously transmits multiple data streams and rank adaptation that adaptively controls the number of spatially multiplexed data streams (Spatial layer) (Rank adaptation) There is.
- the mobile station selects an optimal precoding matrix from the precoding codebook defined for each rank, and feeds back (reports) it to the base station.
- the precoding codebook includes at least one precoding matrix.
- the mobile station feeds back channel state information (CSI: Channel State Information) indicating the channel state to the base station.
- the CSI assumes a rank index (RI: Rank Indicator) indicating a recommended transmission rank, a precoding matrix index (PMI: Precoding Matrix Indicator) indicating a recommended precoding matrix, and the above RI and PMI.
- RI rank index
- PMI Precoding Matrix Indicator
- CQI Channel Quality Indicator
- the base station applies the determined precoding matrix to each mobile station's unique reference signals (that is, UE-specific RS (Reference Signals)) and a shared channel (for example, PDSCH (Physical Downlink Shared CHannel)) Is transmitted to the mobile station.
- the mobile station demodulates the PDSCH using a channel estimation value based on the UE-specific RS.
- the conventional CSI feedback method assumes PDSCH transmission to which SU-MIMO (Single User-Multiple Input Multiple Output), which is a spatial multiplexing technique for signals addressed to one mobile station, is applied. That is, it is assumed that reliability is ensured by retransmission control. For this reason, the base station attaches importance to the transmission efficiency for one mobile station, and selects a rank corresponding to the radio channel quality and a precoding matrix corresponding to the rank.
- SU-MIMO Single User-Multiple Input Multiple Output
- 3D MIMO 3D MIMO
- a plurality of antennas arranged two-dimensionally that is, a multi-antenna arranged in a two-dimensional array is used.
- a horizontal directional beam and a vertical directional beam are formed using a plurality of two-dimensionally arranged antennas.
- Several methods of using a horizontal directional beam and a vertical directional beam have been proposed. For example, there has been proposed a utilization method in which a conventional fixed sector in the horizontal direction is adaptively divided in the elevation direction using a directional beam in the vertical direction. According to this proposal, the communication capacity of the entire system can be increased by dividing the cell into many sectors.
- a usage method has been proposed in which a signal is transmitted using a directional beam in the vertical direction to mobile stations having different heights such as different floors of existing buildings.
- this utilization method the communication characteristics of each mobile station can be improved, and interference between communications of different mobile stations can be reduced.
- IEEE 802.16 Broadband Wireless Access Working Group Closed Loop MIMO Precoding (2004-11-04) 3GPP TSG-RAN WG1, R1-130302, “Discussion on scenarios for elevation beamforming and FD-MIMO,” “January 2012 3GPP TSG-RAN, RP-122034, “Study on 3D-channel model for Elevation Beamforming and FD-MIMO studies for LTE,” December 2012
- a feedback method of a multiple CSI process has been proposed.
- this multiple CSI process feedback method a restriction on a subset of a codebook is added to each CSI process. Then, the mobile station feeds back CSI from the range of RI and PMI limited according to the bitmap indicated by the higher layer.
- the mobile station feeds back CSI assuming SU-MIMO of the recommended rank of the connected cell.
- the mobile station feeds back CSI assuming MU-MIMO and EPDCCH of rank 1 of the connected cell.
- the above-mentioned CSI feedback method improves system performance.
- the mobile station transmits CSI (for example, 12 bits) twice the size of one cell to the base station as compared with the conventional one.
- CSI for example, 12 bits
- the overhead of the control information transmitted from the mobile station to the base station upon CSI feedback greatly increases.
- the size of CSI may be further increased, and the overhead of control information may be further increased.
- the disclosed technology has been made in view of the above, and an object thereof is to provide a mobile station and a reporting method that can reduce the overhead of control information.
- first precoding information used for horizontal beam forming in a base station corresponding to first channel state information second precoding information corresponding to second channel state information, and Calculating third precoding information used for vertical beam forming in the base station corresponding to both the first channel state information and the second channel state information, and the first channel
- the first precoding information and the third precoding information are reported, and in the second channel status information report, the third precoding information is not reported, and the second precoding information is reported. 2 precoding information is reported.
- the overhead of control information can be reduced.
- FIG. 1 is a block diagram illustrating an example of a mobile station according to the first embodiment.
- FIG. 2 is a block diagram illustrating an example of the CSI calculation unit according to the first embodiment.
- FIG. 3 is a block diagram illustrating an example of the base station according to the first embodiment.
- FIG. 4 is a sequence diagram for explaining an example of processing operations of the mobile station and the base station according to the first embodiment.
- FIG. 5 is a diagram illustrating an example of a two-dimensional array arrangement multi-antenna.
- FIG. 6 is a diagram for explaining the precoding matrix W.
- FIG. 7 is a diagram for explaining the precoding matrix W.
- FIG. 8 is a diagram illustrating an example of a cross-polarized antenna.
- FIG. 9 is a diagram illustrating a hardware configuration of the mobile station.
- FIG. 10 is a diagram illustrating a hardware configuration of the base station.
- FIG. 1 is a block diagram illustrating an example of a mobile station according to the first embodiment.
- a mobile station 10 includes a received RF (Radio Frequency) unit 11, an FFT (Fast Fourier Transform) unit 12, a channel estimation unit 13, a CSI calculation unit 14, a control signal demodulation unit 15, and a data signal.
- the demodulator 16 includes a report controller 17, an uplink control signal generator 18, an IFFT (Inversed Fast Fourier Transform) unit 19, and a transmission RF unit 20.
- the mobile station 10 has a plurality of antennas (not shown).
- the CSI calculation unit 14 includes CSI calculation processing units 21 and 22.
- FIG. 2 is a block diagram illustrating an example of the CSI calculation unit according to the first embodiment. Each of these components is connected so that signals and data can be input and output in one direction or in both directions.
- the reception RF unit 11 performs radio frequency-to-baseband conversion, quadrature demodulation, and A / D (Analog to Digital) conversion on a signal received from the base station 30 described later.
- the FFT unit 12 performs FFT timing detection, CP (Cyclic Prefix) removal, and FFT processing on the signal received by the reception RF unit 11.
- the channel estimation unit 13 extracts a UE-specific RS that is a reference signal for data demodulation from the received signal after the FFT processing. In addition, the channel estimation unit 13 calculates a channel estimation value from the cross-correlation between the extracted UE-specific RS and a known reference signal.
- the control signal demodulator 15 extracts a control signal from the received signal after the FFT process, and performs channel compensation using the channel estimation value. Further, the control signal demodulator 15 performs data demodulation and error correction decoding to restore transmission format information such as an application rank as control information.
- the data signal demodulator 16 extracts a data signal from the received signal after the FFT processing, and performs channel compensation using the channel estimation value.
- the data signal demodulator 16 restores the information bits by performing data demodulation and error correction decoding based on the transmission format information.
- the CSI calculation unit 14 extracts CSI (Channel State Information) -RS (Reference Signals), which is a reference signal for channel quality measurement, from the received signal after the FFT processing.
- CSI Channel State Information
- RS Reference Signals
- the CSI calculation unit 14 calculates a channel estimation value, which is a radio channel distortion represented by a complex number, from the cross-correlation between the extracted CSI-RS and a known reference signal.
- the CSI calculation unit 14 calculates first channel state information, that is, first CSI, and second channel state information, that is, second CSI, using the calculated channel estimation value. That is, in the CSI calculation unit 14, the CSI calculation processing unit 21 calculates first channel state information, and the CSI calculation processing unit 22 calculates second channel state information.
- the CSI calculation processing unit 21 determines a communication rank for SU-MIMO and a precoding matrix for SU-MIMO using the calculated channel estimation value.
- the determined pre-coding matrix for SU-MIMO includes a first horizontal component pre-coding matrix used for horizontal beam forming in a base station 30 described later, and a vertical component used for vertical beam forming. And a precoding matrix.
- the CSI calculation processing unit 21 determines RI and PMI (PMI V and PMI H ) based on the determined SU-MIMO communication rank and SU-MIMO precoding matrix.
- PMI V is a PMI determined based on the vertical component precoding matrix
- PMI H is a PMI determined based on the first horizontal component precoding matrix.
- the CSI calculation processing unit 21 determines the CQI of each code word (Code word) assuming the determined RI and PMI.
- the code word is a unit of an encoded bit string related to data transmitted on the PDSCH, and the data transmitted in one subframe is divided into a maximum of two code words according to the rank.
- the CSI calculation processing unit 21 outputs the calculated first channel state information, that is, RI, CQI, and PMI to the report control unit 17. Further, the CSI calculation processing unit 21 outputs the selected vertical component precoding matrix to the CSI calculation processing unit 22.
- the CSI calculation processing unit 22 determines the second horizontal component precoding matrix using the calculated channel estimation value and the vertical component precoding matrix received from the CSI calculation processing unit 21.
- the second horizontal component precoding matrix is a horizontal component precoding matrix in the MU-MIMO precoding matrix.
- the vertical component precoding matrix in the MU-MIMO precoding matrix is the same as the vertical component precoding matrix in the SU-MIMO precoding matrix.
- the CSI calculation processing unit 22 determines PMI H ′ based on the determined second horizontal component precoding matrix. Then, the CSI calculation processing unit 22 outputs the calculated second channel state information, that is, PMI H ′ to the report control unit 17.
- the report control unit 17 reports the first channel state information to the base station 30 to be described later by outputting the first channel state information to the uplink control signal generation unit 18 at the reporting timing of the first channel state information. To do. That is, the report control unit 17 reports RI, CQI, and PMI (PMI V and PMI H ) for SU-MIMO to the base station 30 described later at the reporting timing of the first channel state information.
- the report control unit 17 outputs the second channel state information to the uplink control signal generation unit 18 at the report timing of the second channel state information, thereby transmitting the second channel state information to the base station 30 described later.
- the report control unit 17 reports PMI H ′ for MU-MIMO to the base station 30 described later at the report timing of the second channel state information.
- PMI V is reported to the base station 30 described later as the first channel state information, but the present invention is not limited to this. Since PMI V is common to both SU-MIMO and MU-MIMO, it may be reported to the base station 30 described later as second channel state information.
- the uplink control signal generation unit 18 performs error correction coding and data modulation on channel state information of a cell to which the mobile station 10 is connected, that is, control information including the first channel state information or the second channel state information. Etc.
- the IFFT unit 19 executes an IFFT process and adds a CP to a signal transmitted to the base station 30 described later.
- the transmission RF unit 20 performs D / A (Digital to Analog) conversion, quadrature modulation, and conversion from a baseband to a radio frequency for a signal to be transmitted.
- D / A Digital to Analog
- FIG. 3 is a block diagram illustrating an example of the base station according to the first embodiment.
- the base station 30 includes a scheduler 31, a data signal generation unit 32, a control signal generation unit 33, a precoding determination unit 34, a UE-specific RS generation unit 35, and precoding processing units 36a, 36b, and 36c. And have.
- the base station 30 also includes a CSI-RS generator 37, a physical channel multiplexer 38, an IFFT unit 39, a transmission RF unit 40, a reception RF unit 41, an FFT unit 42, and an uplink control signal demodulation unit 43. And have.
- the base station 30 has a two-dimensional array arrangement multi-antenna (not shown). Each of these components is connected so that signals and data can be input and output in one direction or in both directions.
- the scheduler 31 performs scheduling for each mobile station connected to the base station 30. For example, the scheduler 31 allocates radio resources (such as time and frequency) to each mobile station. Further, the scheduler 31 determines a MIMO scheme (that is, SU-MIMO or MU-MIMO) to be applied to each radio resource. In addition, the scheduler 31 selects a transmission format (for example, application rank).
- radio resources such as time and frequency
- MIMO scheme that is, SU-MIMO or MU-MIMO
- a transmission format for example, application rank
- the data signal generation unit 32 performs error correction coding and data modulation on the data input from the scheduler 31.
- the control signal generation unit 33 performs error correction coding and data modulation on control information including transmission format information such as application rank.
- the Precoding determination unit 34 based on the first channel state information and the second channel state information reported from the mobile station 10, a SU-MIMO precoding matrix, a MU-MIMO precoding matrix, and , A precoding matrix for EPDCCH is determined.
- the precoding determination unit 34 determines a precoding matrix for SU-MIMO based on PMI (PMI V and PMI H ) included in the first channel state information. Then, the Precoding determination unit 34 outputs the determined SU-MIMO precoding matrix to the Precoding processing units 36a and 36c.
- the Precoding determination unit 34 based on the PMI H ′ included in the second channel state information and the PMI V included in the first channel state information, and the MU-MIMO precoding matrix and the EPDCCH Determine the precoding matrix for. Then, the precoding determination unit 34 outputs the precoding matrix for MU-MIMO to the precoding processing units 36a and 36c. Further, the Precoding determination unit 34 outputs a precoding matrix for EPDCCH to the Precoding processing units 36b and 36c.
- the UE-specific RS generation unit 35 generates the UE-specific RS.
- Each Precoding processing unit 36a, 36b, 36c executes Precoding processing based on each precoding matrix input from the Precoding determination unit 34.
- the CSI-RS generator 37 generates the above CSI-RS.
- the physical channel multiplexing unit 38 frequency-multiplexes each physical channel.
- the IFFT unit 39 performs IFFT processing on a signal transmitted to the mobile station 10 and adds a CP.
- the transmission RF unit 40 performs D / A conversion, orthogonal modulation, and conversion from a baseband to a radio frequency for a signal to be transmitted.
- the reception RF unit 41 performs conversion from a radio frequency to a baseband, orthogonal demodulation, and A / D conversion on a signal received from the mobile station 10.
- the FFT unit 42 performs FFT timing detection, CP removal, and FFT processing on the signal received by the reception RF unit 41.
- the uplink control signal demodulator 43 extracts the control signal and the uplink DM-RS from the received signal after the FFT process, and performs channel compensation using the channel estimation value obtained from the extracted DM-RS. Further, the uplink control signal demodulation unit 43 restores the first channel state information and the second channel state information reported from the mobile station 10 as the control information by performing data demodulation and error correction decoding.
- FIG. 4 is a sequence diagram for explaining an example of processing operations of the mobile station and the base station according to the first embodiment.
- the base station 30 transmits the CSI-RS generated by the CSI-RS generation unit 37 (step S101), and the mobile station 10 receives the CSI-RS.
- the CSI calculation unit 14 determines RI, CQI, and PMI (PMI V and PMI H ) for SU-MIMO using the received CSI-RS (step S102).
- the CSI calculation unit 14 determines PMI H ′ for MU-MIMO using the received CSI-RS and the PMI V determined in step S102 (step S103). The determination of PMI in step S102 and step S103 will be described in detail later.
- the report control unit 17 reports the first channel state information, that is, RI, CQI, and PMI (PMI V and PMI H ) to the base station 30 at the reporting timing of the first channel state information ( Step S104).
- the reporting of the first channel state information is performed by the CSI process # 1.
- the report control unit 17 reports the second channel state information, that is, PMI H ′ to the base station 30 at the reporting timing of the second channel state information (step S105).
- the reporting of the second channel state information is performed by the CSI process # 2.
- the Precoding determination unit 34 based on the first channel state information and the second channel state information reported from the mobile station 10, provides a SU-MIMO precoding matrix and a MU-MIMO precoding matrix.
- a coding matrix and a precoding matrix for EPDCCH are determined (step S106).
- the scheduler 31 performs scheduling for the mobile station 10 (step S107).
- the precoding processing units 36a and 36c apply the precoding matrix for SU-MIMO determined in step S106 to the UE-specific RS used for demodulation of PDSCH and PDSCH. Further, the Precoding processing units 36b and 36c apply the EPDCCH precoding matrix determined in Step S106 to the UE-specific RS used for the demodulation of the EPDCCH and the EPDCCH. Then, the transmission RF unit 40 transmits the PDSCH, the UE-specific RS, and the EPDCCH to which the corresponding precoding matrix is applied in the precoding processing units 36a, 36b, and 36c to the mobile station 10 (step S108).
- the channel estimation unit 13 performs channel estimation based on the UE-specific RS transmitted in step S108. Then, the control signal demodulator 15 and the data signal demodulator 16 decode PDSCH and EPDCCH, respectively, based on the channel estimation value obtained by the channel estimator 13 (step S109).
- the scheduler 31 performs scheduling for the mobile station 10 (step S110).
- the precoding processing units 36a and 36c apply the MU-MIMO precoding matrix determined in step S106 to the PDSCH and the UE-specific RS used for PDSCH demodulation. Further, the Precoding processing units 36b and 36c apply the EPDCCH precoding matrix determined in Step S106 to the UE-specific RS used for the demodulation of the EPDCCH and the EPDCCH. Then, the transmission RF unit 40 transmits the PDSCH, UE-specific RS, and EPDCCH to which the corresponding precoding matrix is applied in the precoding processing units 36a, 36b, and 36c to the mobile station 10 (step S111).
- the channel estimation unit 13 performs channel estimation based on the UE-specific RS transmitted in step S111. Then, the control signal demodulator 15 and the data signal demodulator 16 decode PDSCH and EPDCCH, respectively, based on the channel estimation value obtained by the channel estimator 13 (step S112).
- the base station 30 has a two-dimensional array arrangement multi-antenna.
- the base station 30 has a two-dimensional array arrangement multi-antenna as shown in FIG.
- FIG. 5 is a diagram illustrating an example of a two-dimensional array arrangement multi-antenna. In FIG. 5, a total of 16 antennas of 4 ⁇ 4 are illustrated.
- an antenna set of a two-dimensional array arrangement multi-antenna may be simply referred to as an “antenna set”.
- the base station 30 uses a precoding matrix W whose elements are weights corresponding to the antennas included in the antenna set. For example, as shown in FIG. 6, a precoding matrix W having weights W 1 -W 16 corresponding to the antennas ANT1-16 as elements is used.
- FIG. 6 is a diagram for explaining the precoding matrix W.
- the precoding matrix W may be separated and horizontal component precoding matrix W H, the vertical component precoding matrix W V.
- the horizontal component precoding matrix WH is common to all the first type groups in which the antennas included in the antenna set are grouped in the horizontal direction.
- the antennas ANT1-4 are one type 1 group
- the antennas ANT5-8 are one type 1 group
- the antennas ANT9-12 are one type 1 group
- the antenna ANT13 -16 is one type 1 group.
- the vertical component precoding matrix W V is common to all of the type 2 groups antenna included in the antenna set is grouped in the vertical direction. In the example of FIG.
- the antennas ANT1, 5, 9, and 13 are one type 1 group
- the antennas ANT2, 6, 10, and 14 are one type 1 group
- the antennas ANT3, 7, 11, and 15 are used.
- the antennas ANT4, 8, 12, 16 are one type 1 group.
- the precoding matrix W is expressed in the form shown in FIG.
- FIG. 7 is a diagram for explaining the precoding matrix W.
- T represents a transposed matrix. That is, the precoding matrix W, by multiplying the horizontal component precoding matrix W H, and a vertical component precoding matrix W V, is obtained.
- the precoding matrix W shown in FIG. 7 is for the case where the number of spatial layers is 1, and when the number of spatial layers is 2 or more, it becomes a matrix having a plurality of element columns.
- the vertical component precoding matrix W V is common to all of the plurality of element columns, and the horizontal component precoding matrix W between the element columns. Only H is different.
- the roles of the horizontal beam and the vertical beam are set as follows. That is, in the horizontal direction beam, the spatial multiplexing of the data stream and the directivity formation are appropriately used as usual. That is, the horizontal beam and communication rank differ depending on the MIMO scheme, physical channel, and the like.
- the vertical beam has a sharp directivity. That is, the vertical beam is common regardless of the MIMO system, the physical channel, or the like.
- each type 1 group is a cross-polarized antenna as shown in the upper diagram of FIG.
- FIG. 8 is a diagram illustrating an example of a cross-polarized antenna.
- the cross-polarized antenna can be divided into two uniform linear array antennas.
- the horizontal component precoding matrix W H is the matrix element W H1, it can be separated into the matrix element W H2.
- the matrix element W H1 gives a phase difference between the antennas in the uniform linear array antenna.
- the matrix element W H1 affects the directivity formation.
- the matrix element WH2 gives a phase difference between the uniform linear array antennas.
- the matrix element W H1 has less variation with respect to time and frequency than the matrix element W H2 . That is, the matrix element W H1 is intended for wide band and long term channel characteristics, and the matrix element W H2 is frequency selective and short term channel characteristics. Is targeted.
- the CSI calculation unit 14 determines the PMI in the mobile station 10. In the following, two specific examples of the PMI determination method will be described.
- the CSI calculation unit 14 determines a PMI for SU-MIMO.
- CSI calculation unit 14 a matrix element W H2, fixed to one of a plurality of candidates of matrix elements W H2.
- the CSI calculation unit 14 maximizes the communication capacity of the entire system bandwidth from a plurality of candidates of combinations of the vertical component precoding matrix W V and the matrix element W H1 while the matrix element W H2 is fixed. The combination to be made is determined.
- CSI calculation unit 14 in a state where fixed to the determined combination, from among a plurality of candidates of matrix elements W H2, for each sub-band, the communication capacity is determined matrix element W H2 becomes maximum.
- the CSI calculation unit 14 determines the PMI for MU-MIMO.
- the CSI calculation unit 14 uses the vertical component precoding matrix W V determined for SU-MIMO.
- CSI calculation unit 14 ', and matrix elements W H2' matrix elements W H2 is fixed to one of a plurality of candidates of.
- the CSI calculation unit 14 fixes the entire system bandwidth from among a plurality of candidates for the matrix element W H1 ′ in a state where the fixed matrix element W H2 ′ and the vertical component precoding matrix W V are fixed.
- the matrix element W H1 ′ that maximizes the communication capacity is determined.
- the CSI calculating unit 14 determines the matrix element W H2 ′ that maximizes the communication capacity for each subband in a state where the determined matrix element W H1 ′ and the vertical component precoding matrix W V are fixed. To do.
- PMI for SU-MIMO that is, PMI V and PMI H (that is, W H1 and W H2 )
- PMI for MU-MIMO that is, PMI H ′ (that is, W H1 ′ and W H2).
- the determination of the combination may be performed as follows. That is, the CSI calculation unit 14 calculates the communication capacity of the entire system bandwidth for all combinations of the combinations of the vertical component precoding matrix W V and the matrix element W H1 and the candidates of the matrix element W H2. To do. Then, CSI calculation unit 14, for each candidate of the combination of the vertical component precoding matrix W V and the matrix element W H1, sums the calculated communication capacity, the total value is determined a combination having the maximum.
- Specific example 2 is the same as specific example 1 in determining the PMI for SU-MIMO. However, the specific example 2 is different from the specific example 1 in determining the PMI for MU-MIMO.
- the CSI calculation unit 14 uses the vertical component precoding matrix W V and the matrix element W H1 that are determined for SU-MIMO.
- the CSI calculation unit 14 determines a matrix element W H2 ′ having the maximum communication capacity for each subband in a state where the vertical component precoding matrix W V and the matrix element W H1 are fixed.
- the CSI calculation unit 14 in the mobile station 10 corresponds to the first channel state information, and the first precoding information (used for horizontal beam forming in the base station 30) ( For example, PMI H ) and second precoding information (for example, PMI H ′) corresponding to the second channel state information are calculated.
- the CSI calculation unit 14 also includes third precoding information (for example, PMI V) used for vertical beam forming in the base station 30 corresponding to both the first channel state information and the second channel state information. ) Is calculated.
- the report control unit 17 reports the first precoding information and the third precoding information in the first channel state information report (for example, CSI process # 1), and the second channel state information In the report (for example, CSI process # 2), the third precoding information is not reported, but the second precoding information is reported.
- the third precoding information common to the first channel state information and the second channel information is changed to the time when the first channel state information is reported and the time when the first channel state information is reported. Can be reported in either. Thereby, the overhead of control information can be reduced.
- each antenna is described as a physical antenna.
- the disclosed technique can be similarly applied to a logical antenna such as an antenna port.
- EPDCCH and PDSCH are exemplified as physical channels to which Precoding is applied.
- the EPDCCH may be another control channel such as PDCCH (Physical Downlink Control CHannel) or PCFICH (Physical Control Format Indicator CHannel).
- the PDSCH may also be another data channel.
- each component of each part illustrated in the first embodiment does not necessarily need to be physically configured as illustrated.
- the specific form of distribution / integration of each part is not limited to the one shown in the figure, and all or a part thereof may be functionally or physically distributed / integrated in arbitrary units according to various loads and usage conditions. Can be configured.
- each device is all or any part of it on a CPU (Central Processing Unit) (or a micro computer such as MPU (Micro Processing Unit) or MCU (Micro Controller Unit)). You may make it perform.
- CPU Central Processing Unit
- MPU Micro Processing Unit
- MCU Micro Controller Unit
- Various processing functions may be executed entirely or arbitrarily on a program that is analyzed and executed by a CPU (or a microcomputer such as an MPU or MCU) or hardware based on wired logic. .
- the mobile station and base station of the first embodiment can be realized by the following hardware configuration, for example.
- FIG. 9 is a diagram illustrating a hardware configuration example of the mobile station.
- the mobile station 100 includes an RF (Radio Frequency) circuit 101, a processor 102, and a memory 103.
- RF Radio Frequency
- Examples of the processor 102 include a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and an FPGA (Field Programmable Gate Array).
- Examples of the memory 103 include a RAM (Random Access Memory) such as SDRAM (Synchronous Dynamic Random Access Memory), a ROM (Read Only Memory), a flash memory, and the like.
- the various processing functions performed in the mobile station of the first embodiment may be realized by executing a program stored in various memories such as a nonvolatile storage medium by a processor included in the amplification device. That is, the FFT unit 12, the channel estimation unit 13, the CSI calculation unit 14, the control signal demodulation unit 15, the data signal demodulation unit 16, the report control unit 17, the uplink control signal generation unit 18, and the IFFT unit 19 May be recorded in the memory 103, and each program may be executed by the processor 102.
- the FFT unit 12, the channel estimation unit 13, the CSI calculation unit 14, the control signal demodulation unit 15, the data signal demodulation unit 16, the report control unit 17, the uplink control signal generation unit 18, and the IFFT unit 19 Each processing executed by each of them may be shared and executed by a plurality of processors such as a baseband CPU and an application CPU.
- the reception RF unit 11 and the transmission RF unit 20 are realized by the RF circuit 101.
- FIG. 10 is a diagram illustrating a hardware configuration example of the base station.
- the base station 200 includes an RF circuit 201, a processor 202, a memory 203, and a network IF (Inter Face) 204.
- the processor 202 include a CPU, a DSP, and an FPGA.
- the memory 203 include RAM such as SDRAM, ROM, flash memory, and the like.
- the various processing functions performed in the base station according to the first embodiment may be realized by executing a program stored in various memories such as a nonvolatile storage medium by a processor included in the amplification device. That is, the scheduler 31, the data signal generation unit 32, the control signal generation unit 33, the precoding determination unit 34, the UE-specific RS generation unit 35, the precoding processing unit 36, the CSI-RS generation unit 37, the physical A program corresponding to each process executed by the channel multiplexing unit 38, IFFT unit 39, FFT unit 42, and uplink control signal demodulation unit 43 is recorded in the memory 203, and each program is executed by the processor 202. Good. Further, the transmission RF unit 40 and the reception RF unit 41 are realized by the RF circuit 201.
- the base station 200 is an integrated apparatus, it is not limited to this.
- the base station 200 may be configured by two separate devices, a wireless device and a control device.
- the RF circuit 201 is disposed in the wireless device, and the processor 202, the memory 203, and the network IF 204 are disposed in the control device.
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Abstract
Description
[移動局の構成例]
図1は、実施例1の移動局の一例を示すブロック図である。図1において、移動局10は、受信RF(Radio Frequency)部11と、FFT(Fast Fourier Transform)部12と、チャネル推定部13と、CSI算出部14と、制御信号復調部15と、データ信号復調部16と、報告制御部17と、上り制御信号生成部18と、IFFT(Inversed Fast Fourier Transform)部19と、送信RF部20とを有する。移動局10は、複数のアンテナ(図示せず)を有している。CSI算出部14は、図2に示すように、CSI算出処理部21,22を有する。図2は、実施例1のCSI算出部の一例を示すブロック図である。これら各構成部分は、一方向又は双方向に、信号やデータの入出力が可能なように接続されている。
図3は、実施例1の基地局の一例を示すブロック図である。図3において、基地局30は、スケジューラ31と、データ信号生成部32と、制御信号生成部33と、Precoding決定部34と、UE-specific RS生成部35と、Precoding処理部36a,36b,36cとを有する。また、基地局30は、CSI-RS生成部37と、物理チャネル多重部38と、IFFT部39と、送信RF部40と、受信RF部41と、FFT部42と、上り制御信号復調部43とを有する。また、基地局30は、2次元アレー配置マルチアンテナ(図示せず)を有している。これら各構成部分は、一方向又は双方向に、信号やデータの入出力が可能なように接続されている。
以上の構成を有する移動局10及び基地局30の処理動作の一例について説明する。図4は、実施例1の移動局及び基地局の処理動作の一例の説明に供するシーケンス図である。
まず、CSI算出部14は、SU-MIMO用のPMIを決定する。
SU-MIMO用のPMIの決定については、具体例2は、具体例1と同じである。ただし、MU-MIMO用のPMIの決定について、具体例2は、具体例1と異なる。
[1]実施例1では、各アンテナを物理的なアンテナとして説明したが、開示の技術はアンテナポートのような論理的なアンテナにも同様に適用可能である。
11,41 受信RF部
12,42 FFT部
13 チャネル推定部
14 CSI算出部
15 制御信号復調部
16 データ信号復調部
17 報告制御部
18 上り制御信号生成部
19,39 IFFT部
20,40 送信RF部
21,22 CSI算出処理部
30 基地局
31 スケジューラ
32 データ信号生成部
33 制御信号生成部
34 Precoding決定部
35 UE-specific RS生成部
36a,36b,36c Precoding処理部
37 CSI-RS生成部
38 物理チャネル多重部
43 上り制御信号復調部
Claims (7)
- 基地局から送信された既知信号に基づいてチャネル状態情報を前記基地局へ報告し、前記基地局との間で空間多重による無線通信を行う移動局であって、
第1のチャネル状態情報に対応する、前記基地局で水平方向のビーム形成に用いられる第1のプリコーディング情報と、第2のチャネル状態情報に対応する第2のプリコーディング情報と、前記第1のチャネル状態情報及び前記第2のチャネル状態情報の両方に対応する、前記基地局における垂直方向のビーム形成に用いられる第3のプリコーディング情報とを算出する算出手段と、
前記第1のチャネル状態情報の報告では、前記第1のプリコーディング情報及び前記第3のプリコーディング情報を報告し、前記第2のチャネル状態情報の報告では、前記第3のプリコーディング情報を報告せず、前記第2のプリコーディング情報を報告する報告制御手段と、
を具備することを特徴とする移動局。 - 前記第1のチャネル状態情報及び前記第2のチャネル状態情報の一方は、1つの移動局向けの空間多重で用いられ、他方は、複数の移動局向けの空間多重で用いられる、
ことを特徴とする請求項1に記載の移動局。 - 前記基地局は、2次元に配列された複数のアンテナを有し、
前記第1のプリコーディング情報及び第2のプリコーディング情報のそれぞれは、前記複数のアンテナがグループ分けされた複数の第1種グループの全てで共通であり、
前記第3のプリコーディング情報は、前記複数のアンテナがグループ分けされた複数の第2種グループの全てで共通である、
ことを特徴とする請求項1又は2に記載の移動局。 - 各第1種グループは、前記複数のアンテナが水平方向でグループ分けされたグループであり、
各第2種グループは、前記複数のアンテナが垂直方向でグループ分けされたグループである、
ことを特徴とする請求項3に記載の移動局。 - 前記第1のチャネル状態情報及び前記第2のチャネル状態情報は、異なる物理チャネルで用いられる、
ことを特徴とする請求項1に記載の移動局。 - 前記第1のチャネル状態情報及び前記第2のチャネル状態情報の一方は、共有チャネルで用いられ、他方は、制御チャネルで用いられる、
ことを特徴とする請求項1に記載の移動局。 - 基地局との間で空間多重による無線通信を行う移動局によるチャネル状態情報の報告方法であって、
第1のチャネル状態情報に対応する、前記基地局で水平方向のビーム形成に用いられる第1のプリコーディング情報と、第2のチャネル状態情報に対応する第2のプリコーディング情報と、前記第1のチャネル状態情報及び前記第2のチャネル状態情報の両方に対応する、前記基地局における垂直方向のビーム形成に用いられる第3のプリコーディング情報とを算出し、
前記第1のチャネル状態情報の報告では、前記第1のプリコーディング情報及び前記第3のプリコーディング情報を報告し、前記第2のチャネル状態情報の報告では、前記第3のプリコーディング情報を報告せず、前記第2のプリコーディング情報を報告する、
ことを特徴とする報告方法。
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