WO2017069110A1 - 基地局、移動局及び無線通信方法 - Google Patents
基地局、移動局及び無線通信方法 Download PDFInfo
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- WO2017069110A1 WO2017069110A1 PCT/JP2016/080803 JP2016080803W WO2017069110A1 WO 2017069110 A1 WO2017069110 A1 WO 2017069110A1 JP 2016080803 W JP2016080803 W JP 2016080803W WO 2017069110 A1 WO2017069110 A1 WO 2017069110A1
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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
- H04B7/0413—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
- H04B7/0478—Special codebook structures directed to feedback optimisation
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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
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
Definitions
- the present invention relates to a multiple input multiple output (MIMO) technology, and more particularly to a base station, a mobile station, and a radio communication method, which are applied when a data signal is transmitted to a receiving side in a multi data stream.
- MIMO multiple input multiple output
- a precoding matrix codebook is stored in advance in the radio base station and mobile station, and the code stored in advance according to the channel state of the mobile station, etc.
- a code word used for the mobile station to communicate with the radio base station is selected from the book.
- LTE-A LTE-Advanced
- LTE-A LTE-Advanced
- a master code book is stored in advance in the radio base station and the mobile station.
- the radio base station may determine a setting item code book that can be used by the radio base station and the mobile station during actual data transmission through the setting item according to the actual situation.
- the codeword may be a subset of the codeword in the master codebook.
- the radio base station transmits setting item information to the mobile station so that the mobile station accurately generates the setting item codebook.
- the terms setting item (configuration entry, configuration item), configuration (setting), and configured (set) may be used interchangeably.
- a base station transmits a code book generation unit that determines a code book subset corresponding to a predetermined setting item from among a plurality of setting items of a master code book, and transmits information on the predetermined setting item And a transmitting unit.
- a method for generating a setting item of a master code book determines a setting beam pattern corresponding to each of a plurality of setting items of a master code book in the case of multi-data stream transmission, and the beam pattern indicates a beam usable by a mobile station in the master code book,
- Each of the setting beam patterns includes a plurality of independent data stream beam patterns, and for each of the setting items, the plurality of independent data stream beam patterns corresponding to the setting item are the same, and each setting item includes Combining the beams indicated by the corresponding plurality of independent data stream beam patterns to form a plurality of multi data stream beam items for the setting item; and the plurality of multis formed for each setting item.
- Data stream beam item To confirm the candidate multi-data stream beam item multiple data streams beam item satisfying a predetermined condition in part from in, and generating the setting item based on was determined the candidate multi-data stream beam item, the.
- an electronic apparatus determines a setting beam pattern corresponding to each of a plurality of setting items of the master code book, and the beam pattern indicates a beam that can be used by the mobile station in the master code book.
- Each of the setting beam patterns includes a plurality of independent data stream beam patterns, and for each of the setting items, the plurality of independent data stream beam patterns corresponding to the setting items are the same, and A beam combining unit that combines the beams indicated by the plurality of independent data stream beam patterns corresponding to the setting item to form a plurality of multi data stream beam items for the setting item, and is formed for each of the setting items.
- the plurality of multi-data streams A setting item generation that determines a part of the multi-data stream beam items satisfying a predetermined condition as a candidate multi-data stream beam item and generates the setting item based on the determined candidate multi-data stream beam item Part.
- the above aspect of the present invention provides a base station, a mobile station, and a radio communication method when radio communication is performed using a multi-data stream.
- the setting items of the master code book can be formed by using fewer beams, and the subsequent operations required for the mobile station can be simplified.
- a master code book is stored in advance on both the transmission side and the reception side of the embodiment of the present invention, and the master code book includes a plurality of code words.
- each setting item includes a setting item code book corresponding to the setting item, and each setting item code book is a subset of the master code book.
- the code words in the master code book are divided into several code word sets according to a predetermined rule, and the setting item code book corresponding to each setting item is a partial code selected from each code word set. It may consist of words.
- the master codebook includes 8192 codewords, and the 8192 codewords are first divided into 256 codeword sets, of which each codeword set includes 32 codewords.
- the setting item codebook includes two codewords in each codeword set, and a total of 512 codewords in the master codebook.
- the configuration item codebook for configuration item B includes 16 codewords in each codeword set, for a total of 4096 codewords in the master codebook.
- the setting item codebook for setting item C includes 16 codewords in each codeword set, for a total of 4096 codewords in the master codebook.
- the configuration item codebook for configuration item D includes 16 codewords in each codeword set, for a total of 4096 codewords in the master codebook.
- the code word included in the setting item code book corresponding to each setting item can be represented by a beam that can be used by the mobile station to communicate with the radio base station.
- each codeword in the codebook corresponding to the setting item is indicated by a beam usable for the first data stream and a beam usable for the second data stream.
- the code word set in the master code book can be represented by a beam (hereinafter referred to as “master beam set”) included in the code word set in the master code book.
- master beam set included in the code word set in the master code book.
- each codeword in the master codebook is indicated by a beam usable for the first data stream and a beam usable for the second data stream.
- FIG. 1 is a flowchart illustrating a method 100 for generating setting items of a master code book according to an embodiment of the present invention.
- step S101 in the case of multi-data stream transmission, a setting beam pattern corresponding to each of a plurality of setting items of the master code book is determined.
- the setting beam pattern corresponding to each setting item includes a plurality of independent data stream beam patterns.
- the number of independent data stream beam patterns is the same as the number of transmitted data streams.
- the setting beam pattern corresponding to each setting item includes two independent data stream beam patterns (a first data stream beam pattern and a second data stream beam pattern). .
- a plurality of independent data stream beam patterns corresponding to the setting item are the same.
- four setting items (setting item A, setting item B, setting item C, and setting item D) can be provided for the master code book.
- the number of setting items may be other numbers.
- the first data stream beam pattern and the second data stream beam pattern are the same, and for setting item B, the first data stream beam pattern and the second data stream beam pattern are the same.
- the setting item C and the setting item D the first data stream beam pattern and the second data stream beam pattern are the same.
- the beam pattern indicates a beam that can be used by the mobile station in the master beam set.
- the setting beam pattern corresponding to each setting item indicates a beam that can be used by the mobile station in the master beam set among the setting items.
- Each set beam pattern may include as many independent data stream beam patterns as there are data streams for communication between the radio base station and the mobile station.
- Each independent data stream beam pattern represents a usable beam in the master beam set.
- the first data stream beam pattern indicates a beam that can be used by the mobile station in the first data stream
- the second data stream beam pattern indicates a beam that can be used by the mobile station in the second data stream.
- FIG. 2 is an explanatory diagram showing a state of an exemplary setting beam pattern of the present invention.
- FIG. 3 is an explanatory diagram showing the state of another exemplary setting beam pattern of the present invention.
- a master beam set including a plurality of beams that can be transmitted by the radio base station is a master beam set represented by a 4 * 2 grid.
- Each grid in the master beam set represents one beam.
- Each independent data stream beam pattern represents a beam that can be used by the mobile station (shown in diagonally filled grids in FIGS. 2 and 3). Further, in the examples shown in FIGS.
- the beam in the first direction included in the master beam set is a horizontal beam and the beam in the second direction is a vertical beam. I will explain it.
- the embodiment of the present invention is not limited to this, and the master beam set may be composed of beams in other directions.
- two independent data stream beam patterns that is, a first data stream beam pattern and a second data stream beam pattern correspond to each setting item in the setting items A to D, respectively.
- the first data stream beam pattern and the second data stream beam pattern corresponding to the same setting item are the same.
- (x1, y1) represents a usable beam in the first data stream.
- x1 represents a relative index in the first direction of the first data stream beam
- y1 represents a relative index in the second direction of the first data stream beam.
- x1 represents a relative index when the horizontal beam of the first data stream is in the master beam set
- y1 is a relative index when the vertical beam of the first data stream is in the master beam set.
- the order of the relative index of the horizontal beam and the relative index of the vertical beam may be adjusted, for example, x1 is relative to the vertical beam of the first data stream in the master beam set.
- the index y1 may represent the relative index of the horizontal beam of the first data stream in the master beam set.
- (x2, y2) represents the usable beam in the second data stream.
- x2 represents a relative index in the first direction of the second data stream beam
- y2 represents a relative index in the second direction of the second data stream beam.
- x2 represents a relative index when the horizontal beam of the second data stream is in the master beam set
- y2 is a relative index when the vertical beam of the second data stream is in the master beam set.
- x2 may represent the relative index in the master beam set of the vertical beam of the second data stream
- y2 may represent the relative index in the master beam set of the horizontal beam of the second data stream.
- the codeword relative index and the codeword absolute index correspond one-to-one. Therefore, the absolute index of the codeword can be specified based on the parameter for specifying the codeword set and the relative index of the codeword in the codeword set.
- the first data stream beam pattern indicates that the beams that can be used in the first data stream are (0, 0), (1, 0), (0, 1), (1, 1), The usable beams shown in the second data stream beam pattern are similar to the usable beams shown in the first data stream beam pattern.
- the first data stream beam pattern indicates that the beams that can be used in the first data stream are (0, 1), (1, 1), (2, 0) (3, 0).
- the usable beam shown in the two data stream beam pattern is similar to the usable beam shown in the first data stream beam pattern.
- the first data stream beam pattern indicates that the usable beams in the first data stream are (0, 0), (1, 0), (2, 0), (3, 0),
- the usable beams shown in the second data stream beam pattern are similar to the usable beams shown in the first data stream beam pattern.
- the first data stream beam pattern and the second data stream beam pattern correspond to each setting item, and the first data stream beam pattern and the second data stream corresponding to the same setting item are the same.
- grids indicated by diagonal lines indicate beams that can be used by the mobile station in the data stream.
- the first data stream beam pattern indicates that the beams that can be used in the first data stream are (0, 0), (2, 0), (0, 1), (2, 1), The usable beams shown in the second data stream beam pattern are similar to the usable beams shown in the first data stream beam pattern.
- the first data stream beam pattern indicates that the beams that can be used in the first data stream are (0, 1), (1, 0), (2, 1) (3, 0).
- the usable beam shown in the two data stream beam pattern is similar to the usable beam shown in the first data stream beam pattern.
- the first data stream beam pattern indicates that the usable beams in the first data stream are (0, 0), (1, 0), (2, 0), (3, 0),
- the usable beams shown in the second data stream beam pattern are similar to the usable beams shown in the first data stream beam pattern.
- the plurality of setting items may include a first setting item and a plurality of second setting items other than the first setting item, and an independent data stream beam pattern corresponding to the first setting item.
- the beams indicated by may include beams that do not overlap each other between the beams indicated by the independent data stream beam patterns of different second setting items.
- the number of beams indicated by the independent data stream beam pattern corresponding to each second setting item is equal to the number of beams indicated by the independent data stream beam pattern corresponding to the first setting item. Is the same as the number of
- the beams indicated by the independent data stream beam pattern corresponding to the setting item C are independent data stream beams of different second setting items (setting item B, setting item D).
- the number of beams indicated by the independent data stream beam pattern corresponding to the setting item C includes independent beams corresponding to the setting items B and D. It is the same as the beam indicated by the stream beam pattern.
- the beams overlapping each other between the beams indicated by the independent data stream beam patterns of the setting items B and D are (0, 0) and (1, 0).
- the beams shown in the corresponding independent data stream beam patterns are (0, 1), (1, 1), (2, 0), (3, 0), and thus the overlapping beams (0, 0). ), (1,0) are not included.
- FIG. 2 is similar to FIG. 2, and FIG. 3 also shows setting beam patterns of four setting items (that is, setting item A, setting item B, setting item C, and setting item D).
- the setting item C the beam indicated by the independent data stream beam pattern corresponding to the setting item C is the independent data stream beam pattern of the different second setting item (setting item B, setting item D).
- the number of beams shown in the independent data stream beam pattern corresponding to the setting item C is independent data stream beam patterns corresponding to the setting items B and D. It is the same as the beam shown in.
- beams that overlap each other between beams indicated by independent data stream beam patterns of different second setting items are (0, 0) and (2, 0)
- the beams indicated by the independent data stream beam pattern corresponding to the setting item C are (0, 1), (1, 0), (2, 1), (3, 0), and thus the overlapping beams. Does not include (0,0), (2,0).
- the beam indicated by the independent data stream beam pattern of the first setting item may not be adjacent in the first direction and / or the second direction.
- the independent data stream beam pattern for the setting item C indicates beams (0, 1), (1, 0), (2, 1), (3, 0). Yes.
- the beam shown in the independent data stream beam pattern for the setting item C is not adjacent in the vertical direction.
- the grid filled with diagonal lines shown in FIG. 3 (representing a beam that can be used by the mobile station in the data stream), the grids filled with diagonal lines are not adjacent in the horizontal direction.
- step S102 beams indicated by a plurality of independent data stream beam patterns corresponding to each setting item are combined to form a plurality of multi data stream beam items for the setting item. Specifically, when generating a plurality of data stream beam items for a setting item, one beam is selected from each of the beams indicated by a plurality of independent data stream beam patterns corresponding to the setting item. Then, the respective selected beams are combined to constitute a multi-data stream beam item for the setting item.
- one beam (0, 0) is selected from the beams indicated by the first data stream beam pattern, and one of the beams indicated by the second data stream beam pattern is selected.
- One beam (0,0) is selected, one beam (1,0) is selected from the beams indicated by the second data stream beam pattern, and therefore the multi data stream beam item ( 0, 0, 1, 0).
- the multi data stream beam item 0, 0, 1, 0.
- X4 16 multi-data stream beam items can be configured.
- 4 ⁇ 4 16 multi-data stream beam items for the setting item C and the setting item D can be configured.
- the multi data stream beam items that can be configured for the setting item C are (0, 1, 0, 1), (0, 1, 1, 1), (0, 1, 2, 0), (0, 1, 3). , 0), (1, 1, 0, 1), (1, 1, 1, 1), (1, 1, 2, 0), (1, 1, 3, 0), (2, 0, 0 , 1), (2, 0, 1, 1), (2, 0, 2, 0) (2, 0, 3, 0), (3, 0, 0, 1), (3, 0, 1, 1), (3, 0, 2, 0), (3, 0, 3, 0).
- the order of the relative index of the horizontal beam and the relative index of the vertical beam can be adjusted, and the usable beam of the second data stream.
- the order of the relative index of the horizontal beam and the relative index of the vertical beam can also be adjusted.
- the order of the relative indexes of each data stream can also be adjusted.
- the relative index of the horizontal beam and the vertical beam of the second data stream may be represented first, and then the relative index of the horizontal beam and the vertical beam of the first data stream may be represented.
- the relative index of the horizontal beam of the first data stream and the second data stream may be represented first, and then the relative index of the vertical beam of the first data stream and the second data stream may be represented.
- step S103 some multi-data stream beam items satisfying a predetermined condition are determined as candidate multi-data stream beam items from among a plurality of multi-data stream beam items formed for each setting item.
- the beam of one data stream and the beam of the second data stream are related to each other, so that transmission efficiency can be improved.
- the beam of the first data stream is (0, 1) and the beam of the second data stream is (0, 1) for the beam item (0, 1, 2, 0). 2, 0)
- the beam of the first data stream and the beam of the second data stream are inferior in relevance, and are not selected as candidate multi-data stream beam items.
- the setting items may be overlapped between the candidate multi-data stream beam items.
- some multi data stream beam items (0, 1, 0, 1), (0, 1, 1, 1), (0 , 1, 3, 0), (1, 1, 1, 1), (1, 1, 2, 0), (1, 1, 3, 0), (2, 0, 2, 0), (3 , 0, 3, 0), and thus the eight selected multi-data stream beam items are the candidate multi-data stream beam items.
- the number of beams in the first direction in the candidate multi-data stream beam item of the first setting item may be the same as the number of beams in the second direction.
- the number of beams in the horizontal direction in the eight candidate multi-data stream beam items is the same as the number of beams in the vertical direction.
- the method for selecting a candidate multi-data stream beam item from among a plurality of multi-data stream beam items described with reference to FIGS. 2 and 3 is merely an example of the present invention.
- the selection method according to the embodiment is not limited to this. Different predetermined conditions are provided based on a specific situation, and candidate multi-data stream beam items are selected from a plurality of multi-data stream beam items according to the provided predetermined conditions.
- step S103 the setting item is generated based on the confirmed candidate multi-data stream beam item.
- At least one index set for the setting item is generated based on all candidate multi-data stream beam items for the setting item.
- the candidate multi-data stream beam item for the setting item may be an index set for the setting item.
- the relative index of the horizontal beam of the first data stream, the relative index of the vertical beam of the first data stream, the relative index of the horizontal beam of the second data stream Contains the relative index of the vertical beams of the two data streams.
- an index n representing the polarization direction beam may be added. For example, when there are two possible values of the index of the added polarization direction beam, the eight candidate multi-data stream beam items (0, 1) determined for the setting item C of the setting beam pattern shown in FIG.
- the relative index order of each data stream can also be adjusted when representing a multi-data stream beam item.
- the order of the index set may be arbitrarily adjusted.
- the index of the polarization direction beam is represented after the relative index of the multi data stream beam item is represented first, but the index of the polarization direction beam may be represented first.
- At least one index set for the setting item is generated based on all candidate multi-data stream beam items for the setting item.
- Table 1 shows an index set for the setting item A of the setting beam pattern shown in FIG. 2
- Table 2 shows an index set for the setting item B of the setting beam pattern shown in FIG. 3 shows an index set for the setting item C of the setting beam pattern shown in FIG. 2
- Table 4 shows an index set for the setting item D of the setting beam pattern shown in FIG.
- Table 5 shows an index set for the setting item A of the setting beam pattern shown in FIG. 3
- Table 6 shows an index set for the setting item B of the setting beam pattern shown in FIG. 7 shows an index set for the setting item C of the setting beam pattern shown in FIG. 3
- Table 8 shows an index set for the setting item D of the setting beam pattern shown in FIG.
- the setting may be further performed through the setting item, and the code book subset corresponding to the setting item may be determined from the master code book. Further, the setting beam patterns corresponding to a plurality of setting items partially overlap.
- beams (0, 1) and (1, 1) indicated by an independent data stream beam pattern corresponding to setting item C correspond to setting item B.
- the beams (2, 0) and (3, 0) indicated by the independent data stream beam pattern corresponding to the setting item C correspond to the setting item D. It overlaps with the beam indicated by the independent data stream beam pattern.
- independent data stream beam patterns for setting items A, B, and D overlap with independent data stream beam patterns of other setting items.
- candidate multi-data stream beam items corresponding to a plurality of setting items partially overlap.
- the candidate multi data stream beam item (0, 1, 0, 1) corresponding to the setting item C corresponds to the setting item B.
- the candidate multi-data stream beam item (1, 0, 1, 0) corresponding to the setting item C overlaps with the candidate multi-data stream beam item corresponding to the setting item D.
- the candidate multi data stream beam items for the setting items A, B, and D overlap with the candidate multi data stream beam items of the other setting items.
- index sets corresponding to multiple setting items partially overlap.
- the setting beam pattern shown in FIG. 3 includes an index set of setting item A shown in Table 5, an index set of setting item B shown in Table 6, and an index set of setting item D shown in Table 8.
- Each includes an index set (0, 0, 0, 0, 0).
- both the index set of setting item B shown in Table 6 and the index set of setting item C shown in Table 7 include an index set (0, 1, 0, 1, 0).
- both the index set of setting item C shown in Table 7 and the index set of setting item D shown in Table 8 include an index set (1, 0, 1, 0, 0).
- the basis for generating the setting item is a confirmed candidate multi-data stream beam item. Therefore, when the candidate multi-data stream beam items selected based on different predetermined conditions as described above are different, the setting items generated based on all the candidate multi-data stream beam items for the setting item are At least one index set is also different.
- a setting item codebook corresponding to the index set can be generated.
- the index set for each setting item is further combined to include the index set for each setting item, and the codeword set of the master codebook An index set may be generated for.
- Table 9 shows the index set of the codeword set of the master code book in the setting beam pattern example shown in FIG. As described above, when the index set for each setting item is generated, the candidate multi-data stream beam items of each setting item are overlapped with each other. Therefore, the number of index sets in the codeword set of the master code book is smaller than the total number of index sets for setting item A, setting item B, setting item C, and setting item D. In FIG. 2, the number of index sets for the setting item A, the setting item B, the setting item C, and the setting item D is 2, 16, 16, and 16 in sequence, and the total is 50. However, due to the superposition, in Table 9, the number of index sets of the codeword set of the master code book including the index sets for the setting item A, the setting item B, the setting item C, and the setting item D is 32.
- Table 10 shows an index set of the codeword set of the master code book in the setting beam pattern example shown in FIG. Similar to the illustration of FIG. 2 and Table 9, the number of index sets of the codeword set of the master codebook is smaller than the total number of index sets for the setting item A, the setting item B, the setting item C, and the setting item D.
- a codeword used at the time of data transmission is determined by Equation (1).
- W represents a codeword
- m 1 represents the absolute index of the horizontal beam of the first data stream
- m 2 represents the absolute index of the vertical beam of the first data stream
- m 1 ′ represents the first index
- 2 represents the absolute index of the horizontal beam of the two data streams
- m 2 ′ represents the absolute index of the vertical beam of the second data stream
- n represents the index of the polarization direction beam.
- v represents a horizontal beam, for example, a DFT vector
- u represents a vertical beam, for example, a DFT vector
- ⁇ represents a polarization direction beam, for example, a DFT vector
- Q represents the total number of antennas.
- the codeword set of the master codebook The included codeword can be determined.
- Master codebook codeword set indexes i 1, 1 and i 1, 2 may be reported from the transmitting side to the receiving side, or may be fed back from the receiving side to the transmitting side, i 1 , 1, and i 1.
- 2 may be an index of the code word set of master codebook on different directions, respectively.
- i 1 , 1 may be a horizontal index of a codeword set of a master codebook
- i1, 2 may be a vertical index of a codeword set of a master codebook.
- codewords included in the codeword set of the master codebook can be obtained as shown in Table 11.
- the mathematical formulas shown in Table 11 show the case where they are applied to the set beam pattern as shown in FIG. That is, the index sets in Table 11 and Table 9 correspond to each other.
- i 2 ′ represents the sequence number of the codeword in the master codebook
- p 1 represents the index interval of adjacent beams in the horizontal direction
- p 2 represents the index interval of adjacent beams in the vertical direction
- S 1 represents the index interval between adjacent codeword sets in the horizontal direction
- s 2 represents the index interval between adjacent codeword sets in the vertical direction.
- the absolute index of the codeword can be expressed by the following mathematical formula (2).
- the codeword included in the master codebook can be obtained as shown in Table 12.
- the mathematical formulas shown in Table 12 show the case where they are applied to the set beam pattern shown in FIG. That is, the index sets in Table 12 and Table 10 correspond to each other.
- the sequence numbers i 2 ′ of the respective code words are set so as to correspond to the index sets shown in Table 9 and Table 10, respectively.
- the order of the codewords in the master codebook is not limited to the modes shown in Tables 11 and 12, and the codeword order number i 2 ′ in the master codebook corresponds to the index set of each codeword. You can attach it.
- the case where the data signal is transmitted with two data streams has been described as an example. However, when the data signal is transmitted with more data streams, You may apply. Further, the number of setting items is not limited to four, and other number of setting items may be provided.
- the setting beam pattern for each setting item is not limited to the setting beam pattern illustrated in FIGS. 2 and 3, and may be determined as another setting beam pattern.
- the above embodiment of the present invention provides a method for generating a setting item of a master code book when wireless communication is performed using a multi-data stream. Also, in the setting item generation method according to the embodiment of the present invention, the setting items of the master code book are formed by using fewer beams, and thus the subsequent operations required for the mobile station can be simplified.
- the electronic device is used to execute the method for generating the setting item of the master code book, and is, for example, a base station or a mobile station.
- FIG. 4 is a functional block diagram showing the electronic apparatus 400 according to the embodiment of the present invention.
- the electronic apparatus 400 according to the embodiment of the present invention includes a pattern determination unit 410, a beam synthesis unit 420, and a setting item generation unit 430.
- the electronic apparatus 400 may further include other means, for example, means for performing various processing on data signals or control signals, but these means are related to the contents of the embodiments of the invention. The illustration and description thereof are omitted here.
- the details of the following operations executed by the electronic apparatus 400 according to the embodiment of the present invention are the same as the details described with reference to FIGS. 1 to 3 in the above sentence, and therefore the same here in order to avoid duplication. Detailed description of the details will be omitted.
- the pattern determining unit 410 determines a setting beam pattern corresponding to each of a plurality of setting items of the master codebook in the case of multi-data stream transmission, where the beam pattern indicates a beam that can be used by the mobile station in the beam set. .
- the setting beam pattern corresponding to each setting item includes a plurality of independent data stream beam patterns.
- the number of independent data stream beam patterns is the same as the number of transmitted data streams.
- the setting beam patterns corresponding to the setting items are two independent data stream beam patterns (that is, a first data stream beam pattern and a second data stream beam pattern). )including.
- setting item A setting item A
- setting item B setting item C
- setting item D setting item D
- the number of setting items may be other numbers.
- a plurality of independent data stream beam patterns corresponding to the setting item are the same. Specifically, as shown in FIGS. 2 and 3, the first data stream beam pattern and the second data stream beam pattern are the same for the setting item A, and the first data stream beam pattern is set for the setting item B. And the second data stream beam pattern are the same. Similarly for the setting item C and the setting item D, the first data stream beam pattern and the second data stream beam pattern are the same.
- the plurality of setting items may include a first setting item and a plurality of second setting items other than the first setting item, and an independent data stream beam pattern corresponding to the first setting item. May include beams that do not overlap with each other between the beams indicated by the independent data stream beam patterns of the different second setting items.
- the number of beams indicated by the independent data stream beam pattern corresponding to each second setting item is equal to the number of beams indicated by the independent data stream beam pattern corresponding to the first setting item. It is the same as the number.
- the beams indicated by the independent data stream beam pattern corresponding to the setting item C are independent data streams of different second setting items (that is, the setting item B and the setting item D).
- the number of beams indicated by the independent data stream beam pattern corresponding to the setting item C includes independent beams corresponding to the setting items B and D. It is the same as the beam shown in the data stream beam pattern.
- the beams that overlap each other between the beams indicated by the independent data stream beam patterns of the different second setting items B and D are (0, 0) and (1, 0), and are set.
- the beams indicated by the independent data stream beam pattern corresponding to item C are (0, 1), (1, 1), (2, 0), (3, 0), and thus the overlapping beams ( 0, 0) and (1, 0) are not included.
- FIG. 3 also shows a setting beam pattern including four setting items (that is, setting item A, setting item B, setting item C, and setting item D) in the set beam pattern shown.
- the beam indicated by the independent data stream beam pattern corresponding to the setting item C is the independent data stream beam pattern of the different second setting item (setting item B, setting item D).
- the number of beams shown in the independent data stream beam pattern corresponding to the setting item C is independent data stream beam patterns corresponding to the setting items B and D. It is the same as the beam shown in.
- beams that overlap each other between beams indicated by independent data stream beam patterns of different second setting items are (0, 0) and (2, 0)
- the beams indicated by the independent data stream beam pattern corresponding to the setting item C are (0, 1), (1, 0), (2, 1), (3, 0), and thus the overlapping beams. Does not include (0,0), (2,0).
- the beam indicated by the independent data stream beam pattern of the first setting item may not be adjacent in the first direction and / or the second direction.
- the independent data stream beam pattern for the setting item C is beams (0, 1), (1, 0), (2, 1), (3, 0). Indicates. Of the four beams shown, no beam has the same horizontal beam relative index, i.e., the beams shown in the independent data stream beam pattern for setting item C are not adjacent in the vertical direction. Also, according to the grid filled with diagonal lines shown in FIG. 3 (representing a beam that can be used by the mobile station in the data stream), the grids filled with diagonal lines are not adjacent in the horizontal direction.
- the beam combining unit 420 combines the beams indicated by a plurality of independent data stream beam patterns corresponding to the setting items to form a plurality of multi data stream beam items for the setting items. Specifically, when generating a data stream beam item for a setting item, one beam is selected from each of the beams indicated by a plurality of independent data stream beam patterns corresponding to the setting item, The selected beams are combined to form a multi data stream beam item for the setting item.
- one beam (0, 0) is selected from the beams indicated by the first data stream beam pattern, and the second data stream beam pattern is selected.
- One beam (0,0) is selected from among the beams shown in FIG. 2, and thus a multi data stream beam item (0,0,0,0) for the setting item A is configured.
- setting item B for example, one beam (0, 0) is selected from the beams indicated by the first data stream beam pattern, and one of the beams indicated by the second data stream beam pattern is selected. Beam (0,0) is selected, thus configuring the multi data stream beam item (0,0,0,0) for setting item B.
- one beam (0, 0) is selected from the beams indicated by the first data stream beam pattern
- one beam (1,0) is selected from the beams indicated by the second data stream beam pattern. Therefore, the multi data stream beam item (0, 0, 1, 0) for the setting item B is configured.
- the first data stream beam pattern indicates four usable beams
- the second data stream beam pattern indicates four usable beams.
- 16 multi-data stream beam items can be configured.
- 4 ⁇ 4 16 multi-data stream beam items for the setting item C and the setting item D can be configured.
- the setting item generation unit 430 determines, as candidate multi data stream beam items, some multi data stream beam items that satisfy a predetermined condition from among a plurality of multi data stream beam items formed for each setting item. Specifically, when a part of multi data stream beam items is determined from among a plurality of multi data stream beam items formed for each setting item, The beam of the first data stream and the beam of the second data stream are related to each other, so that transmission efficiency can be improved.
- the beam of the first data stream for the beam item (0, 1, 2, 0) is (0, 1)
- the second data stream The beam is (2, 0)
- the beam of the first data stream and the beam of the second data stream are inferior in relation to each other, so that the beam is not selected as a candidate multi-data stream beam item.
- candidate multi data streams in other setting items may overlap each other.
- some multi data stream beam items (0, 1, 0, 1), (0, 1, 1, 1), (0 , 1, 3, 0), (1, 1, 1, 1), (1, 1, 2, 0), (1, 1, 3, 0), (2, 0, 2, 0), (3 , 0, 3, 0), and thus the eight selected multi-data stream beam items are the candidate multi-data stream beam items.
- the number of beams in the first direction among the candidate multi-data stream beam items of the first setting item is the same as the number of beams in the second direction. May be. For example, as described above, when eight candidate multi-data stream beam items are selected from 16 multi-data stream beam items according to a predetermined condition, the eight candidate multi-data stream beam items are horizontally The number of beams is equal to the number of beams in the vertical direction.
- the setting item generation unit 430 After confirming the candidate multi-data stream beam item, the setting item generation unit 430 further generates the setting item based on the determined candidate multi-data stream beam item.
- At least one index set for the setting item is generated based on all candidate multi-data stream beam items for the setting item.
- the candidate multi-data stream beam item for the setting item may be an index set for the setting item.
- the relative index of the horizontal beam of the first data stream, the relative index of the vertical beam of the first data stream, the relative index of the horizontal beam of the second data stream Contains the relative index of the vertical beams of the two data streams.
- an index n representing a polarization direction beam may be added. For example, when there are two possible values of the index of the added polarization direction beam, for the setting item C of the setting beam pattern shown in FIG.
- setting beam patterns corresponding to a plurality of setting items may partially overlap.
- beams (0, 1) and (1, 1) indicated by an independent data stream beam pattern corresponding to setting item C correspond to setting item B.
- the beams (2, 0) and (3, 0) indicated by the independent data stream beam pattern corresponding to the setting item C correspond to the setting item D. It overlaps with the beam indicated by the independent data stream beam pattern.
- independent data stream beam patterns for setting items A, B, and D overlap with independent data stream beam patterns of other setting items.
- electronic device 400 further combines the index sets for each setting item, includes an index set for each setting item, and creates an index set for the codeword set of the master codebook. It may be generated.
- the master codebook index set may include index sets for the setting item A, the setting item B, the setting item C, and the setting item D.
- the number of index sets in the master codebook is smaller than the total number of index sets for setting item A, setting item B, setting item C, and setting item D.
- the number of index sets for the setting item A, the setting item B, the setting item C, and the setting item D is 2, 16, 16, and 16 sequentially, and the total is 50, but the setting The number of master code book index sets including the index sets for item A, setting item B, setting item C, and setting item D is 32.
- the electronic apparatus 400 has been described by taking the case where the data signal is transmitted with two data streams as an example, but may be applied when the data signal is transmitted with more data streams. Further, the number of setting items is not limited to four, and other number of setting items may be provided.
- the setting beam pattern for each setting item is not limited to the setting beam pattern illustrated in FIGS. 2 and 3, and may be determined as another setting beam pattern.
- the electronic apparatus 400 may further include a code book generation unit.
- the code book generation unit may be set via a setting item, and a code book subset corresponding to the setting item may be determined from the master code book.
- the above embodiment of the present invention provides an electronic device that generates a setting item of a master code book when performing wireless communication using a multi-data stream. Further, in the electronic apparatus according to the embodiment of the present invention, the setting items of the master code book can be formed by using fewer beams, and thus the subsequent operation necessary for the mobile station can be simplified.
- the combinations of the means and steps described in the embodiments of the present invention can be implemented by electronic hardware, computer software, or a combination of both.
- the software module may be stored in any type of computer storage medium.
- the functions realized by the pattern determination unit 410, the beam synthesis unit 420, and the setting item generation unit 430 included in the electronic device 400 can be implemented through a processor (for example, a CPU).
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Abstract
Description
ここで、p1=1、p2=1である。
Claims (8)
- マスタコードブックの複数の設定項目の中から所定の設定項目に対応するコードブックサブセットを確定するコードブック生成部と、
前記所定の設定項目の情報を送信する送信部と、を有することを特徴とする基地局。 - 前記所定の設定項目に基づいてビームを合成するビーム合成部を有することを特徴とする請求項1に記載の基地局。
- 前記複数の設定項目は第1設定項目及び第1設定項目以外の複数の第2設定項目を含み、
前記第1設定項目に対応する独立のデータストリームビームパターンにて示されるビームは、異なる前記第2設定項目の独立のデータストリームビームパターンにて示されるビーム同士の間で互いに重なっていないビームを含むことを特徴とする請求項2に記載の基地局。 - 前記第1設定項目に対応する独立のデータストリームビームパターンにて示されるビームは第1方向及び/又は第2方向において隣接しないことを特徴とする請求項3に記載の基地局。
- 前記所定の設定項目に対応し、複数の独立のデータストリームビームパターンを含む設定ビームパターンを確定するパターン確定部を有し、
前記ビーム合成部は、前記複数の独立のデータストリームビームパターンにて示されるビームを合成し、複数のマルチデータストリームビーム項目を形成し、
前記複数のマルチデータストリームビーム項目の中から所定の条件を満たす一部のマルチデータストリームビーム項目を候補マルチデータストリームビーム項目と確定する設定項目生成部を有し、
確定された候補マルチデータストリームビーム項目において、第1方向におけるビームの数は第2方向におけるビームの数と同じであることを特徴とする請求項2に記載の基地局。 - 各前記第2設定項目に対応する独立のデータストリームビームパターンにて示されるビームの数は、前記第1設定項目に対応する独立のデータストリームビームパターンにて示されるビームの数と同じであることを特徴とする請求項3に記載の基地局。
- 設定項目の情報を受信する受信部と、
マスタコードブックの複数の設定項目の中から前記設定項目に対応するコードブックサブセットを確定するコードブック生成部と、を有することを特徴とする移動局。 - マスタコードブックの複数の設定項目の中から所定の設定項目に対応するコードブックサブセットを確定するステップと、
前記所定の設定項目の情報を送信するステップと、を有することを特徴とする無線通信方法。
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US15/768,070 US10312982B2 (en) | 2015-10-18 | 2016-10-18 | Base station, mobile station and radio communication method |
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