WO2011090106A1 - プリコーディングウェイト生成方法、移動局装置及び基地局装置 - Google Patents
プリコーディングウェイト生成方法、移動局装置及び基地局装置 Download PDFInfo
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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
- H04B7/0452—Multi-user MIMO 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
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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
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
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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
- H04B7/06—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
- H04B7/0634—Antenna weights or vector/matrix coefficients
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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
- 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
- H04B7/10—Polarisation diversity; Directional diversity
Definitions
- the present invention relates to a precoding weight generation method, a mobile station apparatus, and a base station apparatus, and more particularly to a precoding weight generation method, a mobile station apparatus, and a base station apparatus that support multi-antenna transmission.
- UMTS Universal Mobile Telecommunications System
- WSDPA High Speed Downlink Packet Access
- HSUPA High Speed Uplink Packet Access
- CDMA Wideband Code Division Multiple Access
- the third generation system can achieve a maximum transmission rate of about 2 Mbps on the downlink using generally a fixed bandwidth of 5 MHz.
- a maximum transmission rate of about 300 Mbps on the downlink and about 75 Mbps on the uplink can be realized using a variable band of 1.4 MHz to 20 MHz.
- LTE-A LTE Advanced
- LTE-A LTE Advanced
- a MIMO (Multi Input Multi Output) system has been proposed as a wireless communication technology that improves data rate (frequency utilization efficiency) by transmitting and receiving data with a plurality of antennas (for example, non-patented).
- Reference 1 a MIMO system, a plurality of transmission / reception antennas are prepared in a transmitter / receiver, and different transmission information sequences are transmitted simultaneously from different transmission antennas.
- the receiver (mobile station apparatus UE) side by utilizing the fact that different fading fluctuations occur between transmission / reception antennas, the data rate (frequency utilization) is detected by separating and detecting simultaneously transmitted information sequences. Efficiency) can be increased.
- transmission information sequences transmitted simultaneously from different transmission antennas are all transmitted from a single user MIMO (SU-MIMO (Single User MIMO)), which is for the same user, and multi-users, which are for different users.
- SU-MIMO Single User MIMO
- MU-MIMO Multiple User MIMO
- the phase / amplitude control amount (precoding matrix (precoding weight)) to be set in the antenna of the base station apparatus eNodeB on the mobile station apparatus UE side and this precoding
- An optimum PMI is selected from a codebook in which a plurality of PMIs (Precoding Matrix Indicators) associated with the matrix are determined, and this is fed back to the base station apparatus eNodeB as channel information (CSI: Channel State Information).
- CSI Channel State Information
- the PMI is set to a CQI (Channel Quality Indicator) value (hereinafter referred to as “CQI value”) of each stream transmitted from the base station apparatus eNodeB to a single or a plurality of mobile station apparatuses UE. It is selected according to the total value of the expected value of throughput (hereinafter referred to as “throughput expected value”) calculated based on this. More specifically, the PMI associated with the precoding matrix that maximizes the total throughput expectation value calculated from the CQI value of each stream is selected.
- CQI value Channel Quality Indicator
- the expected throughput value is calculated based on the CQI value measured only from the stream, and the expected throughput value is maximized. Therefore, the channel state in the channel transmission path is appropriately reflected in the selected PMI.
- the number of streams for the mobile station apparatus UE is 2 or more (that is, rank 2 or more)
- the total expected throughput value is calculated based on the CQI values measured from a plurality of streams, and the throughput The PMI with the maximum expected value is selected.
- the PMI corresponding to the precoding matrix is A PMI that does not indicate a channel state more appropriately than the PMI can be selected.
- SU-MIMO transmission and MU-MIMO transmission using a user-specific demodulation reference signal are defined in the same DCI (Downlink Control Information) format ( DCI format 2B).
- DCI format 2B Downlink Control Information
- DCI format 2B Downlink Control Information
- DCI format 2B Downlink Control Information
- An object of the present invention is to provide a precoding weight generation method, a mobile station apparatus, and a base station apparatus.
- the mobile station apparatus selects a PMI corresponding to a precoding matrix including a matrix component for a stream that most closely approximates a channel matrix indicating a channel state in a channel transmission path; Transmitting a PMI as channel information to the base station apparatus, and a matrix for a stream that most closely approximates a channel state in a channel transmission path among precoding matrices associated with the PMI transmitted from the mobile station apparatus in the base station apparatus A step of extracting a component; and a step of generating a precoding weight based on the extracted matrix component.
- the PMI corresponding to the precoding matrix including the matrix component that most closely approximates the channel state in the channel transmission path is fed back from the mobile station apparatus to the base station apparatus, and the base station apparatus supports the fed back PMI. Since the matrix component closest to the channel state in the channel transmission path is extracted from the precoding matrix to be used and used to generate the precoding weight, channel information that appropriately indicates the channel state in the channel transmission path is transmitted to the base station.
- the mobile station apparatus of the present invention includes a selection unit that selects a PMI corresponding to a precoding matrix including a matrix component for a stream that most closely approximates a channel matrix indicating a channel state in a channel transmission path, and a PMI selected by the selection unit. And transmitting means for transmitting to the base station apparatus as channel information.
- the base station apparatus of the present invention includes: an extraction unit that extracts a matrix component for a stream that most closely approximates a channel matrix indicating a channel state in a channel transmission path from precoding matrices corresponding to PMI received from a mobile station apparatus; And generating means for generating precoding weights based on the matrix components extracted by the extracting means.
- the precoding weight is generated based on the matrix component for the stream that most closely approximates the channel matrix indicating the channel state in the channel transmission path, the channel information that most appropriately indicates the channel state in the channel transmission path. Therefore, the precoding weight can be generated based on the channel state in the channel transmission path regardless of the number of streams (number of ranks) for the mobile station apparatus, and the SU-MIMO transmission can be performed. And MU-MIMO transmission can be dynamically switched, the data rate (frequency utilization efficiency) of the entire system can be increased.
- a PMI corresponding to a precoding matrix including a matrix component for a stream that most closely approximates a channel state in a channel transmission path is fed back from the mobile station apparatus to the base station apparatus. Since the matrix component for the stream that most closely approximates the channel state in the channel transmission path is extracted from the precoding matrix associated with, and used to generate the precoding weight, a channel that appropriately indicates the channel state in the channel transmission path Since information can be fed back to the base station apparatus and precoding can be performed based on this channel information, the channel state in the channel transmission path regardless of the number of streams (number of ranks) for the mobile station apparatus Reflecting can perform precoding, when dynamically switching between SU-MIMO transmission and MU-MIMO transmission, it becomes possible to increase the system overall data rate (spectral efficiency).
- FIG. 1 is a conceptual diagram of a MIMO system in the LTE scheme.
- the MIMO system shown in FIG. 1 shows a case where multiuser MIMO (MU-MIMO) is performed between the base station apparatus eNodeB and the two mobile station apparatuses UE # 1 and UE # 2.
- MU-MIMO multiuser MIMO
- the base station device eNodeB includes two transmission antennas
- each of the mobile station devices UE # 1 and UE # 2 includes one reception antenna.
- the mobile station apparatuses UE # 1 and UE # 2 measure the channel fluctuation amount using the received signals from the receiving antennas RX 1 and RX 2 , Based on the measured channel fluctuation amount, according to the phase / amplitude control amount (precoding weight (precoding matrix)) that maximizes the reception SINR of the transmission data from the transmission antennas TX 1 and TX 2 of the base station apparatus eNodeB. Selected PMI. Then, the selected PMI is fed back as channel information to the base station apparatus eNodeB on the uplink.
- precoding weight precoding matrix
- transmission data x 1 to the mobile station apparatus UE # 1 were pre-coding the transmission data x 2 to the mobile station apparatus UE # 2 Thereafter, information transmission is performed from each of the transmission / reception antennas TX 1 and TX 2 .
- the base station apparatus eNodeB includes precoding processing units 21 and 22 that perform precoding on transmission data x 1 and x 2 , respectively.
- a weight multiplying unit 21a multiplying the precoding weight W 11 for transmitting the transmission data x 1 from the transmission antenna TX 1, for transmitting the transmission data x 1 from the transmitting antenna TX 2 and a weight multiplying unit 21b multiplying the precoding weight W 12.
- a weight multiplying unit 22a multiplying the precoding weight W 21 for transmitting the transmission data x 2 from the transmission antenna TX 1, the transmission data x 2 from the transmission antenna TX 2 and a weight multiplying unit 22b multiplying the precoding weight W 22 to.
- the transmission data x 1 multiplied by the precoding weight W 11 and the transmission data x 2 multiplied by the precoding weight W 21 are added by the adder 23 and then transmitted from the transmission antenna TX 1 to the channel transmission path. .
- the transmission data x 1 multiplied by the precoding weight W 12 and the transmission data x 2 multiplied by the precoding weight W 22 are added by the adder 24 and then transmitted from the transmission antenna TX 2 to the channel transmission path. Is done.
- the transmission data x 1 and x 2 transmitted from the transmission antennas TX 1 and TX 2 are channels of the channel transmission path formed between the reception antennas RX 1 and RX 2 of the mobile station apparatuses UE # 1 and UE # 2. Affected by fluctuations. That is, the transmission data x 1 and x 2 transmitted from the transmission antenna TX 1 to the reception antenna RX 1 are multiplied by the channel state coefficient h 11, and the transmission data x transmitted from the transmission antenna TX 1 to the reception antenna RX 2. 1, the x 2, the channel condition coefficient h 12 is multiplied.
- transmission data x 1 and x 2 transmitted from the transmission antenna TX 2 to the reception antenna RX 1 are multiplied by the channel state coefficient h 21
- x 1 and x 2 are multiplied by a channel state coefficient h 22 .
- UE # 2 receives the transmission data x 1, x 2 of the received data y 1, y 2 via the receiving antennas RX 1, RX 2.
- the received data y 1 and y 2 have the following values, respectively.
- n 1 and n 2 are noise components.
- the mobile station apparatuses UE # 1 and UE # 2 have the maximum received SINR of the transmission data from the respective transmission antennas TX 1 and TX 2 of the base station apparatus eNodeB.
- a PMI corresponding to the precoding weight is selected.
- (h 11 W 11 + h 21 W 12 ) corresponds to the signal power of the transmission data x 1 for the own device
- (h 11 W 21 + h 21 W 22 ) is corresponds to the signal power of the transmission data x 2 to the other device (mobile station apparatus UE # 2).
- the base station apparatus eNodeB selects a PMI corresponding to a precoding weight that makes the former as large as possible and makes the latter as small as possible.
- each of mobile station apparatuses UE # 1 and UE # 2 was measured from two streams (that is, stream 1 and stream 2 transmitted from transmission antennas TX 1 and TX 2 of base station apparatus eNodeB, respectively). Based on the CQI value, a total value of expected throughput values (throughput expected value) is calculated, and a PMI that maximizes the total expected throughput value is selected.
- the PMI selection method in the mobile station apparatus UE of the MIMO system shown in FIG. 1 will be described using a specific example.
- FIG. 2 is a diagram for explaining a PMI selection method in the mobile station apparatus UE of the MIMO system in the LTE scheme.
- FIG. 2 shows the relationship between the precoding matrix in the codebook held in the mobile station apparatus UE and the expected throughput value.
- a codebook in which only two precoding matrices (PM 1 , PM 2 ) illustrated in FIG. 2 are registered in the base station apparatus eNodeB and the mobile station apparatus UE is held.
- the channel matrix H k corresponding to the channel state in the channel transmission path is assumed to have the following values.
- the expected throughput value calculated based on the CQI value measured from the stream 1 is “10”, and based on the CQI value measured from the stream 2
- the calculated expected throughput value is “1”, and the total value of these expected throughput values is “11”.
- PMI the total value of these expected throughput value is associated to the precoding matrix PM 2 is the maximum is selected.
- the value of the matrix component corresponding to stream 1 shown in the first column of the precoding matrix PM 1 is the largest. This means that the channel state in the channel transmission path is most appropriately indicated in the stream 1 in the precoding matrix PM 1 .
- the selection method of the conventional PMI since the total value of the throughput is calculated based on the CQI value of each stream 1 and 2 are selected PMI that maximizes, it is associated to the precoding matrix PM 2 PMI will be selected.
- the present inventors select the PMI from the total throughput calculated based on the CQI values of a plurality of streams as described above, and thus the matrix corresponding to the stream that most closely approximates the channel state in the channel transmission path. Focusing on the point that a PMI corresponding to a precoding matrix including a component (hereinafter referred to as “matrix component” as appropriate) cannot be selected, the present invention has been achieved.
- the mobile station apparatus UE selects a PMI corresponding to a precoding matrix including a matrix component that most closely approximates the channel state in the channel transmission path, and uses the PMI as the base station apparatus eNodeB.
- the base station apparatus eNodeB from the precoding matrix associated with the PMI fed back from the mobile station apparatus UE, the matrix component closest to the channel state in the channel transmission path is extracted, and the precoding weight of It is used for generation.
- channel information appropriately indicating the channel state in the channel transmission path can be fed back to the base station apparatus eNodeB, and precoding can be performed based on the fed back channel information.
- precoding can be performed reflecting the channel state in the channel transmission path, and even when dynamically switching between SU-MIMO transmission and MU-MIMO transmission, The data rate (frequency utilization efficiency) can be increased.
- the mobile station apparatus UE applied to the precoding weight generation method according to the present invention has a minimum inter-matrix distance (chordal distance) with the channel matrix H k corresponding to the channel state in the channel transmission path.
- a PMI corresponding to a precoding matrix including a matrix component is selected.
- the selection method of PMI in the 1st aspect of the mobile station apparatus UE which concerns on this invention is demonstrated using the specific example shown in FIG.
- FIG. 3 is a diagram for explaining a PMI selection method in the first mode of the mobile station apparatus UE according to the present invention.
- FIG. 3 shows the relationship between the precoding matrix in the codebook held in the mobile station apparatus UE, the throughput expectation value, and the inter-matrix distance.
- the contents of the codebook held in the base station apparatus eNodeB and the mobile station apparatus UE, and the channel matrix H k corresponding to the channel state in the channel transmission path are the same as those in FIG. To do. Therefore, each expected throughput value and the total value thereof are the same values as those shown in FIG.
- the distance between the matrix with the channel matrix H k is “0.01” which is the minimum value.
- the inter-matrix distance with the channel matrix H k is “3.61” which is the maximum value.
- the matrix component corresponding to the stream 1 shown in the first column of the PM 2 (1, j) and the matrix component (1, -j) corresponding to the stream 2 shown in the second column of PM 2 in The inter-matrix distance with the channel matrix H k is “1.81”.
- the PMI corresponding to the precoding matrix PM 1 including the matrix component that minimizes the inter-matrix distance with the channel matrix H k is selected.
- the PMI corresponding to precoding matrix comprising a matrix component which is most approximate to accurately channel matrix H k.
- the base station apparatus eNodeB it becomes possible to feed back the PMI including channel information that most appropriately indicates the channel state in the channel transmission path.
- the mobile station apparatus UE uses a precoding matrix including a matrix component that maximizes a signal-to-interference-plus-noise ratio (SINR). Select the corresponding PMI.
- SINR signal-to-interference-plus-noise ratio
- SINR is proportional to the CQI value measured from each stream. Therefore, the SINR in each stream has the same magnitude relationship as the expected throughput value proportional to the CQI value measured from each stream. That is, it becomes the maximum in the matrix component (1, 1) corresponding to the stream 1 shown in the first column of PM 1 , and the minimum in the matrix component (1, -1) corresponding to the stream 2 shown in the second column. .
- the matrix component corresponding to the stream 1 shown in the first column of the PM 2 (1, j), and the matrix component (1, -j) corresponding to the stream 2 shown in the second column of PM 2 in Although a relatively large SINR is obtained, the SINR corresponding to the matrix component (1, 1) corresponding to the stream 1 indicated in the first column of PM 1 is not reached.
- the precoding matrix associated with the PMI fed back from the mobile station apparatus UE is the closest to the channel state in the channel transmission path.
- the base station device eNodeB extracts matrix components based on the CQI value for each stream that is also fed back from the mobile station device UE. More specifically, the matrix component corresponding to the stream having the maximum CQI value fed back from the mobile station apparatus UE is extracted. Then, precoding weights are generated based on the extracted matrix components.
- the precoding weight can be generated based on the matrix component that most appropriately indicates the channel state in the channel transmission path, the channel in the channel transmission path regardless of the number of streams (rank number) for the mobile station apparatus UE.
- Precoding can be performed reflecting the state, and even when dynamically switching between SU-MIMO transmission and MU-MIMO transmission, it is possible to increase the data rate (frequency utilization efficiency) of the entire system. .
- the CQI value fed back from the mobile station apparatus UE has the same magnitude relationship as the expected throughput value in each stream, as described above. That is, the CQI value measured from stream 1 is larger than the CQI value measured from stream 2. For this reason, in the base station apparatus eNodeB, a matrix component corresponding to the stream 1 (that is, a matrix component in the first column) is extracted from PM 1 corresponding to the PMI fed back from the mobile station apparatus UE. Then, a precoding weight is generated based on the matrix component (1, 1) corresponding to this stream 1.
- FIG. 4 is a diagram for explaining a configuration of the mobile communication system 1 including the mobile station apparatus 10 and the base station apparatus 20 according to the embodiment of the present invention.
- the mobile communication system 1 shown in FIG. 5 is a system including, for example, an LTE system or SUPER 3G.
- the mobile communication system 1 may be called IMT-Advanced or 4G.
- the mobile communication system 1 includes a base station device 20 and a plurality of mobile station devices 10 (10 1 , 10 2 , 10 3 ,... 10 n , n communicating with the base station device 20. Is an integer of n> 0).
- the base station apparatus 20 is connected to the higher station apparatus 30, and the higher station apparatus 30 is connected to the core network 40.
- the mobile station device 10 communicates with the base station device 20 in the cell 50.
- the upper station apparatus 30 includes, for example, an access gateway apparatus, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- each mobile station apparatus (10 1 , 10 2 , 10 3 ,... 10 n ) has the same configuration, function, and state, the following description will be given as the mobile station apparatus 10 unless otherwise noted. Proceed. For convenience of explanation, it is assumed that the mobile station device 10 is in radio communication with the base station device 20, but more generally, user equipment (UE: User Equipment) including both a mobile terminal device and a fixed terminal device. It's okay.
- UE User Equipment
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single carrier transmission method that reduces interference between terminals by dividing a system band into bands each consisting of one or continuous resource blocks for each terminal, and a plurality of terminals using different bands. .
- PDSCH shared by each mobile station device 10 and downlink L1 / L2 control channels (PDCCH, PCFICH, PHICH) are used.
- User data that is, a normal data signal is transmitted by this PDSCH. Transmission data is included in this user data. Note that the CC and scheduling information assigned to the mobile station device 10 by the base station device 20 are notified to the mobile station device 10 through the L1 / L2 control channel.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- User data is transmitted by this PUSCH.
- downlink radio quality information CQI: Channel Quality Indicator
- CQI Channel Quality Indicator
- FIG. 5 is a block diagram showing a configuration of mobile station apparatus 10 according to the present embodiment.
- FIG. 6 is a block diagram showing a configuration of base station apparatus 20 according to the present embodiment. Note that the configurations of the mobile station apparatus 10 and the base station apparatus 20 shown in FIGS. 5 and 6 are simplified to explain the present invention, and the configurations of the normal base station apparatus and the mobile station apparatus are respectively It shall be provided.
- transmission signals transmitted from base station apparatus 20 are received by receiving antennas RX # 1 to RX # N, and transmitted by duplexers 101 # 1 to 101 # N. And the receiving path are output to the RF receiving circuits 102 # 1 to 102 # N. Then, the RF receiving circuits 102 # 1 to 102 # N perform frequency conversion processing for converting radio frequency signals into baseband signals.
- the baseband signal subjected to the frequency conversion processing is subjected to cyclic prefix (CP) removal units 103 # 1 to 103 # N after the CP is removed, and then to a fast Fourier transform unit (FFT unit) 104 # 1 to 104. Is output to #N.
- CP cyclic prefix
- FFT unit fast Fourier transform unit
- Reception timing estimation section 105 estimates the reception timing from the reference signal included in the reception signal and notifies the estimation results to CP removal sections 103 # 1 to 103 # N.
- the FFT units 104 # 1 to 104 # N perform a Fourier transform on the input received signals, and convert the time series signals into frequency domain signals.
- the received signal converted into the frequency domain signal is output to data channel signal demodulation section 106.
- the data channel signal demodulator 106 uses, for example, the minimum mean square error (MMSE) or maximum likelihood estimation detection (MLD: Maximum Likelihood) for the received signals input from the FFT units 104 # 1 to 104 # N. Detection) Separation by signal separation method. As a result, the received signal arriving from the base station apparatus 20 is separated into received signals related to the users # 1 to #k, and a received signal related to the user of the mobile station apparatus 10 (here, user k) is extracted. .
- the channel estimation unit 107 estimates the channel state from the reference signal included in the received signals output from the FFT units 104 # 1 to 104 # N, and the estimated channel state is compared with the data channel signal demodulation unit 106 and the channel quality described later.
- Data channel signal demodulating section 106 separates the received signal by the above-described MLD signal separation method based on the notified channel state. Thereby, the received signal regarding the user k is demodulated.
- the extracted received signal related to the user k is assumed to be demapped by a subcarrier demapping unit (not shown).
- the received signal related to user k demodulated by data channel signal demodulation section 106 is output to channel decoding section 108.
- the channel decoding unit 108 performs channel decoding processing to reproduce the transmission signal #k.
- the channel quality measurement unit 109 measures the channel quality (CQI) based on the channel state notified from the channel estimation unit 107. Then, the CQI that is the measurement result is notified to the feedback control signal generation unit 110.
- the PMI selection unit 111 constitutes a selection unit, and based on the channel state notified from the channel estimation unit 107, the PMI selection unit 111 most closely approximates the channel state in the channel transmission path according to the first or second aspect described above. A PMI corresponding to a precoding matrix including a matrix component is selected. Then, the selected PMI is notified to the feedback control signal generation unit 110.
- the PMI selection unit 111 selects a PMI corresponding to a precoding matrix including a matrix component corresponding to a stream having a minimum inter-matrix distance with a channel matrix corresponding to a channel state in a channel transmission path (first Embodiment). Also, the PMI corresponding to the precoding matrix including the matrix component corresponding to the stream with the maximum received SINR is selected (second mode). It is also possible to select the PMI by switching between the first and second modes in accordance with an instruction from the base station apparatus 20. The feedback control signal generation unit 110 receives the PMI selected in this way.
- the feedback control signal generation unit 110 constitutes a part of transmission means, and based on the notified CQI and PMI, a control signal (for example, PUCCH) for feeding back these to the base station apparatus 20 is generated.
- the control signal generated by the feedback control signal generation unit 110 is output to the multiplexer (MUX) 112.
- Transmission data #k related to user #k sent from the higher layer is channel-encoded by channel encoder 113 and then data-modulated by data modulator 114.
- Transmission data #k data-modulated by data modulation section 114 is converted from a time-series signal to a frequency domain signal by a serial / parallel conversion section (not shown) and output to subcarrier mapping section 115.
- the subcarrier mapping unit 115 maps the transmission data #k to subcarriers according to the schedule information instructed from the base station apparatus 20. At this time, subcarrier mapping section 115 maps (multiplexes) reference signal #k generated by a reference signal generation section (not shown) to subcarriers together with transmission data #k. Transmission data #k mapped to subcarriers in this way is output to precoding multiplication section 116.
- the precoding multiplication unit 116 shifts the phase and / or amplitude of the transmission data #k for each of the reception antennas RX # 1 to RX # N based on the precoding weight obtained from the PMI selected by the PMI selection unit 111.
- the transmission data #k phase-shifted and / or amplitude-shifted by the precoding multiplier 116 is output to the multiplexer (MUX) 112.
- the multiplexer (MUX) 112 the transmission data #k that has been phase-shifted and / or amplitude-shifted and the control signal generated by the feedback control signal generator 110 are combined, and each of the receiving antennas RX # 1 to RX # N is combined. A transmission signal is generated.
- the transmission signal generated by the multiplexer (MUX) 112 is subjected to inverse fast Fourier transform by an inverse fast Fourier transform unit 117 and converted from a frequency domain signal to a time domain signal, and then CP adding units 118 # 1 to 118 #.
- the CP is added at #N and output to the RF transmission circuits 119 # 1 to 119 # N.
- the reception antennas RX # 1 to RX # are passed through the duplexers 101 # 1 to 101 # N.
- N is output from the reception antennas RX # 1 to RX # N to the base station apparatus 20 via the uplink.
- PMI is selected according to the first or second aspect described above, and the selected PMI is Since the feedback is made to the station apparatus 20, it is possible to feed back the PMI corresponding to the precoding matrix including the matrix component that most closely approximates the channel state in the channel transmission path. As a result, the channel state in the channel transmission path can be changed. It becomes possible to feed back the PMI including the channel information most appropriately indicated.
- a scheduler determines the number of users to be multiplexed (the number of multiplexed users) based on channel estimation values given from channel estimation units 215 # 1 to 215 # k described later. Then, uplink / downlink resource allocation contents (scheduling information) for each user are determined, and transmission data # 1 to #k for users # 1 to #k are transmitted to corresponding channel coding sections 201 # 1 to 201 # k. .
- Transmission data # 1 to #k are channel-encoded by channel encoders 202 # 1 to 202 # k, and then output to data modulators 202 # 1 to 202 # k for data modulation. At this time, channel coding and data modulation are performed based on channel coding rates and modulation schemes provided from CQI information updating sections 219 # 1 to 219 # k described later. Transmission data # 1 to #k data-modulated by data modulation sections 202 # 1 to 202 # k are output to subcarrier mapping section 203.
- the subcarrier mapping unit 203 maps the transmission data # 1 to #k to subcarriers according to the schedule information given from the scheduler. At this time, subcarrier mapping section 203 maps (multiplexes) reference signals # 1 to #k input from a reference signal generation section (not shown) to subcarriers together with transmission data # 1 to #k. Transmission data # 1 to #k mapped to subcarriers in this way are output to precoding multiplication sections 204 # 1 to 204 #k.
- Precoding multiplication sections 204 # 1 to 204 # k transmit transmission data # 1 to #k for each of transmission antennas TX # 1 to TX # N based on a precoding weight given from precoding weight generation section 220 described later. Phase and / or amplitude shift (weighting of transmit antenna TX # 1 to transmit antenna TX # N by precoding). Transmission data # 1 to #k whose phases and / or amplitudes are shifted by precoding multiplication sections 204 # 1 to 204 #k are output to multiplexer (MUX) 205.
- MUX multiplexer
- the transmission data # 1 to #k shifted in phase and / or amplitude are combined to generate transmission signals for the transmission antennas TX # 1 to TX # N.
- the transmission signal generated by the multiplexer (MUX) 205 is subjected to inverse fast Fourier transform by the inverse fast Fourier transform units 206 # 1 to 206 # N to be converted from a frequency domain signal to a time domain signal. Then, after the CP is added by the cyclic prefix (CP) adding units 207 # 1 to 207 # N, they are output to the RF transmission circuits 208 # 1 to 208 # N.
- CP cyclic prefix
- the transmission antennas TX # 1 to TX # are transmitted via the duplexers 209 # 1 to 209 # N.
- N is transmitted to the mobile station apparatus 10 via the downlink from the transmission antennas TX # 1 to TX # N.
- the transmission signal transmitted from the mobile station apparatus 10 in the uplink is received by the transmission antennas TX # 1 to TX # N, and is transmitted to the transmission path and the reception path by the duplexers 209 # 1 to 209 # N.
- the signals are output to the RF receiving circuits 210 # 1 to 210 # N.
- frequency conversion processing for converting the radio frequency signal into the baseband signal is performed in the RF reception circuits 210 # 1 to 210 # N.
- the baseband signal subjected to the frequency conversion process is output to the fast Fourier transform units (FFT units) 212 # 1 to 212 # N after the CPs are removed by the CP removal units 211 # 1 to 211 # N. .
- FFT units fast Fourier transform units
- Reception timing estimation section 213 estimates the reception timing from the reference signal included in the reception signal, and notifies the CP removal sections 211 # 1 to 211 # N of the estimation result.
- the FFT units 212 # 1 to 212 # N perform Fourier transform on the input received signals, and convert the time series signals into frequency domain signals.
- the received signals converted into these frequency domain signals are output to data channel signal demultiplexing sections 214 # 1 to 214 # k.
- the data channel signal demultiplexing sections 214 # 1 to 214 # k use, for example, the minimum mean square error (MMSE) or maximum likelihood estimation of the received signals input from the FFT sections 212 # 1 to 212 # k. It separates by the detection (MLD: Maximum Likelihood Detection) signal separation method. As a result, the received signal that has arrived from the mobile station apparatus 10 is separated into received signals related to the users # 1 to #k.
- Channel estimation sections 215 # 1 to 215 # k estimate the channel state from the reference signal included in the received signals output from FFT sections 212 # 1 to 212 # k, and the estimated channel state is data channel signal separation section 214.
- Data channel signal separation sections 214 # 1 to 214 # k separate the received signal based on the reported mean channel state using the above-mentioned minimum mean square error or MLD signal separation method.
- the received signals related to user # 1 to user #k separated by data channel signal separation sections 214 # 1 to 214 # k are demapped by a subcarrier demapping section (not shown) and returned to a time-series signal. Thereafter, the data is demodulated by a data demodulator (not shown).
- Channel decoding sections 217 # 1 to 217 # k perform channel decoding processing to reproduce transmission signals # 1 to #k.
- Control channel signal demodulation sections 216 # 1 to 216 # k demodulate control channel signals (eg, PUCCH) included in the received signals input from FFT sections 212 # 1 to 212 # k. At this time, control channel signal demodulation sections 216 # 1 to 216 # k demodulate control channel signals corresponding to users # 1 to #k, respectively. At this time, control channel signal demodulation sections 216 # 1 to 216 # k demodulate the control channel signal based on the channel state notified from channel estimation sections 215 # 1 to 215 # k. The control channel signals demodulated by control channel signal demodulation sections 216 # 1 to 216 # k are output to channel information extraction sections 218 # 1 to 218 # k and CQI information update sections 219 # 1 to 219 # k.
- the control channel signals demodulated by control channel signal demodulation sections 216 # 1 to 216 # k are output to channel information extraction sections 218 # 1 to 218 # k and CQI information update sections 2
- Channel information extraction sections 218 # 1 to 218 # k constitute extraction means and are included in each control channel signal (for example, PUCCH) input from control channel signal demodulation sections 216 # 1 to 216 # k.
- Channel information that most closely approximates the channel state in the channel transmission path is extracted from the information. Specifically, based on information (PMI and CQI values) included in the control channel signal (for example, PUCCH) as channel information, the channel state in the channel transmission path included in the precoding matrix corresponding to the PMI is changed. Extract the closest matrix component.
- Channel information (matrix components corresponding to the corresponding stream) extracted by channel information extraction sections 218 # 1 to 218 # k is output to precoding weight generation section 220.
- Precoding weight generation section 220 constitutes generation means, and is based on channel information (matrix components corresponding to the corresponding stream) input from channel information extraction sections 218 # 1 to 218 # k. A precoding weight indicating a phase and / or amplitude shift amount for 1 to #k is generated. Each generated precoding weight is output to precoding multiplication sections 204 # 1 to 204 # k, and is used for precoding transmission data # 1 to transmission data #k.
- the CQI information updating units 219 # 1 to 219 # k measure CQI from the reference signal included in each control channel signal (for example, PUCCH) input from the control channel signal demodulation units 216 # 1 to 216 # k, and The CQI information is always updated to the latest state.
- CQI information updated by CQI information updating sections 219 # 1 to 219 # k is output to channel encoding sections 201 # 1 to 201 # k and data modulation sections 202 # 1 to 202 # k, respectively.
- channel information extraction sections 218 # 1 to 218 # k extract matrix components that are closest to the channel state in the channel transmission path as channel information, and perform precoding. Since the weight generation unit 220 generates precoding weights indicating the phase and / or amplitude shift amounts for the transmission data # 1 to #k based on the channel information (matrix components corresponding to the corresponding stream). Since the precoding weight can be generated based on the matrix component that most appropriately indicates the channel state in the channel transmission path, the channel state in the channel transmission path is determined regardless of the number of streams (number of ranks) for the mobile station apparatus UE. It can be reflected and pre-coded, and SU-MI In the case where switching between O transmission and MU-MIMO transmission dynamically, it becomes possible to increase the system overall data rate (spectral efficiency).
- mobile station apparatus 10 selects a PMI corresponding to a precoding matrix including a matrix component that most closely approximates the channel state in the channel transmission path. While the PMI is fed back to the base station apparatus 20, the matrix component that most closely approximates the channel state in the channel transmission path among the precoding matrices associated with the PMI fed back from the mobile station apparatus 10 in the base station apparatus 20. Are extracted and used to generate precoding weights. As a result, channel information appropriately indicating the channel state in the channel transmission path can be fed back to the base station apparatus 20, and precoding can be performed based on the fed back channel information. Regardless of the number of streams (rank number), precoding can be performed reflecting the channel state in the channel transmission path, and even when dynamically switching between SU-MIMO transmission and MU-MIMO transmission, The data rate (frequency utilization efficiency) can be increased.
- mobile station apparatus 10 selects a PMI corresponding to a precoding matrix including a matrix component that most closely approximates a channel state in a channel transmission path, and feeds back to base station apparatus 20
- a matrix component that most closely approximates the channel state in the channel transmission path is extracted as channel information and used for generating precoding weights.
- the method for extracting and using channel information in the base station apparatus 20 is not limited to this and can be changed as appropriate. For example, it is possible to divide and extract a matrix component that most closely approximates the channel state in the channel transmission path, and use a part of the extracted different matrix components to generate precoding weights for different streams.
- FIG. 7 is a diagram for explaining a channel information extraction method in the base station apparatus 20 to which the precoding weight generation method according to the present invention is applied.
- FIG. 7A shows a precoding matrix PM 3 corresponding to the PMI selected by the mobile station apparatus 10, and in FIG. 7B, the base station apparatus 20 extracts the precoding matrix PM 3.
- the matrix component part is shown.
- the matrix component a is the matrix component that approximates the channel state in the channel transmission path.
- the base station device 20 uses the channel information extraction units 218 # 1 to 218 # k to set the CQI value and a predetermined rule. Based on this, a part of the matrix component a (first row, second row) and the other part (third row, fourth row) are extracted and output to the precoding weight generation unit 220 as channel information. To do. Then, the precoding weight generation unit 220 uses a part (first row, second row) of the matrix component a, for example, to generate a precoding weight for stream 1, and another part for other stream 2 Used to generate precoding weights.
- precoding can be performed by reflecting the channel state in the channel transmission path in transmission data from different antennas.
- polarization crossing array antenna even when dynamically switching between SU-MIMO transmission and MU-MIMO transmission, it is possible to increase the data rate (frequency utilization efficiency) of the entire system. Note that the effect obtained when the channel information extraction method in the base station apparatus 20 is changed in this way is not limited to the case where the polarization crossing array antenna is used.
- the channel information extraction method in the base station apparatus 20 is changed in this way, it is necessary to add a certain restriction to the PMI selected by the mobile station apparatus 10. Specifically, it is necessary to select only the PMI associated with the precoding matrix in which the same value is defined for a part of the matrix component extracted by the channel information extraction unit 218 and the other part. is there.
- the restriction on the selected PMI is realized by, for example, codebook subset list notified from the base station apparatus 20 to the mobile station apparatus 10.
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Abstract
Description
y1=h11(W11x1+W21x2)+h21(W12x1+W22x2)+n1
=(h11W11+h21W12)x1+(h11W21+h21W22)x2+n1
y2=h12(W11x1+W21x2)+h22(W12x1+W22x2)+n2
=(h12W11+h22W12)x1+(h12W21+h22W22)x2+n2
Claims (7)
- 移動局装置において、チャネル伝送路におけるチャネル状態を示すチャネル行列に最も近似するストリームに対する行列成分を含むプリコーディング行列に対応するPMIを選択するステップと、選択したPMIをチャネル情報として基地局装置に送信するステップと、基地局装置において、移動局装置から送信されたPMIに対応づけられるプリコーディング行列のうち、チャネル伝送路におけるチャネル状態に最も近似するストリームに対する行列成分を抽出するステップと、抽出した行列成分に基づいてプリコーディングウェイトを生成するステップとを具備することを特徴とするプリコーディングウェイト生成方法。
- チャネル伝送路におけるチャネル状態を示すチャネル行列に最も近似するストリームに対する行列成分を含むプリコーディング行列に対応するPMIを選択する選択手段と、前記選択手段により選択したPMIをチャネル情報として基地局装置に送信する送信手段とを具備することを特徴とする移動局装置。
- 前記選択手段は、前記チャネル行列との行列間距離(chordal distance)が最小となる行列成分を含むプリコーディング行列に対応するPMIを選択することを特徴とする請求項2記載の移動局装置。
- 前記選択手段は、装置本体におけるSINRが最大となる行列成分を含むプリコーディング行列に対応するPMIを選択することを特徴とする請求項2記載の移動局装置。
- 移動局装置から受信したPMIに対応するプリコーディング行列のうち、チャネル伝送路におけるチャネル状態を示すチャネル行列に最も近似するストリームに対する行列成分を抽出する抽出手段と、前記抽出手段により抽出した行列成分に基づいてプリコーディングウェイトを生成する生成手段とを具備することを特徴とする基地局装置。
- 前記抽出手段は、移動局装置から送信される各ストリームのCQIの値が最も大きいストリームに対応する行列成分を抽出することを特徴とする請求項5記載の基地局装置。
- 前記抽出手段は、チャネル伝送路におけるチャネル状態を示すチャネル行列に最も近似する行列成分を分割して抽出し、前記生成手段は、前記抽出手段により抽出された異なる行列成分の一部に基づいてそれぞれ異なるストリーム用のプリコーディングウェイトを生成することを特徴とする請求項5記載の基地局装置。
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US10708946B2 (en) * | 2016-08-12 | 2020-07-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Technique for determining a channel width of a channel used in a wireless communication network |
WO2018231008A1 (ko) * | 2017-06-15 | 2018-12-20 | 엘지전자 주식회사 | 무선 통신 시스템에서 코드북 기반 상향링크 전송 방법 및 이를 위한 장치 |
US11445487B2 (en) | 2018-06-15 | 2022-09-13 | At&T Intellectual Property I, L.P. | Single user super position transmission for future generation wireless communication systems |
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