CN106936486A - A kind of CSI feedback method and device - Google Patents

A kind of CSI feedback method and device Download PDF

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Publication number
CN106936486A
CN106936486A CN201511021278.8A CN201511021278A CN106936486A CN 106936486 A CN106936486 A CN 106936486A CN 201511021278 A CN201511021278 A CN 201511021278A CN 106936486 A CN106936486 A CN 106936486A
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China
Prior art keywords
coding matrix
initial
column vector
extension
matrix set
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CN201511021278.8A
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Chinese (zh)
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CN106936486B (en
Inventor
陈文洪
陈润华
高秋彬
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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Priority to CN201511021278.8A priority Critical patent/CN106936486B/en
Priority to PCT/CN2016/113943 priority patent/WO2017114513A1/en
Publication of CN106936486A publication Critical patent/CN106936486A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]

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

Abstract

The invention discloses a kind of CSI feedback method and device.In the present invention, terminal is extended the pre-coding matrix set that is expanded to initial pre-coding matrix set according to the column vector arrangement mode of agreement, and carries out CSI measurements and feedback according to the extension pre-coding matrix set.Because extension pre-coding matrix set is obtained on the basis of being extended to initial pre-coding matrix set, the scale for extending pre-coding matrix is more than initial pre-coding matrix set, therefore CSI measurements and feedback are carried out based on extension pre-coding matrix set, compared with feedback than carrying out CSI measurements based on initial pre-coding matrix set, the CSI that terminal can be made to determine and feed back can more reflect actual channel status, and then reduce the excessive possibility of the SINR difference of the multiple data flows for being mapped to same code word.

Description

A kind of CSI feedback method and device
Technical field
The present invention relates to communication technical field, more particularly to a kind of CSI (Channel State Information, Channel condition information) feedback method and device.
Background technology
Mobile and broadband turns into the developing direction of modern communication technology, 3GPP (3rd Generation Partnership Project, third generation partner program) be devoted to LTE (Long Term Evolution, Long Term Evolution) system as 3G systems evolution, target is development 3GPP wireless access technologys towards height Data rate, low latency and optimization packet data application direction evolution.The multi-antenna technology of physical layer into One of key technology for current mobile communications system, multi-antenna technology has lot of advantages, such as using many The spatial multiplexing gain of antenna expands the handling capacity etc. of system.
LTE Rel-8 systems introduce closed loop precoding technology to improve spectrum efficiency.Closed loop precoding skill Art requirement preserves identical pre-coding matrix set, referred to as code book in base station and terminal.Different transmission ranks (Rank) size of corresponding code book with comprising code word may it is different, transmission rank is downlink transfer here The number of plies is assumed.After terminal estimates channel information according to cell common pilots, selected from code book by certain criterion Go out a pre-coding matrix.The criterion of selection can be maximum channel capacity, maximize output Signal to Interference plus Noise Ratio Deng.The pre-coding matrix that terminal will be selected index in the codebook feeds back to base station by up channel, the rope Draw referred to as PMI (Precoding Matrix Indicator, pre-coding matrix instruction), the PMI of terminal to report Can be regarded as the quantized value of channel condition information.Base station determines what the terminal should be used according to PMI is received Pre-coding matrix.Except PMI, terminal also reports transmission rank indication information (RI, Rank corresponding with PMI Indicator)。
The transmission of descending two code words is could support up in LTE system, each code word there can be respective modulation Coded system, using independent HARQ (Hybrid Automatic Repeat reQuest, the automatic weight of mixing Pass request) process.If the number of plies of downlink transfer is more than 2, a code word can be mapped to many numbers According to stream (data flow is one layer).Mapping relations between code word and layer are made an appointment：If Number of plies L is even number, then the number of plies of each code word mapping is L/2；If number of plies L is odd number, two codes The number of plies of word mapping is respectively (L-1)/2 and (L+1)/2.When downlink precoding is carried out, each data flow is used Precoding vector be different, so in receiving terminal, detection SINR (the Signal to of each data flow Interference plus Noise Ratio, Signal to Interference plus Noise Ratio) it is also different.Terminal is being carried out When CQI (Channel Quality Indication, channel quality is indicated) estimates, typically can be same to being mapped to The SINR treatment of all data flows of one code word, obtains the equivalent SINR of the code word, so as to calculate CQI, such as after the SINR of all corresponding data streams is carried out averagely, obtain the equivalent SINR of the code word.
If being mapped to multiple data flows of same code word because pre-coding gain difference causes SINR difference Larger, they are too high using the modulation coding mode that identical modulation coding mode is likely to result in some data flows Or it is too low, the detection SINR with data flow is mismatched, so as to cause the throughput of transmissions of these data flows Decline, influence total message transmission rate.
The content of the invention
The present invention implements to provide a kind of CSI feedback method and device, for based on extension pre-coding matrix collection Conjunction carries out CSI feedback, the CSI of terminal feedback and the matching degree of channel status is improved, so as to reduce mapping To the excessive possibility of the SINR difference of multiple data flows of same code word.
CSI feedback method provided in an embodiment of the present invention, including：
Terminal is extended according to the column vector arrangement mode of agreement to initial pre-coding matrix set, is expanded Exhibition pre-coding matrix set；
The terminal carries out CSI measurements according to the extension pre-coding matrix set；
The CSI that the terminal is measured to base station feedback.
Preferably, the terminal is carried out according to the column vector arrangement mode of agreement to initial pre-coding matrix set Extension, including：
For the initial pre-coding matrix in part in the initial pre-coding matrix set, row according to agreement to Amount arrangement mode is extended to initial pre-coding matrix set, and be expanded pre-coding matrix；
For the initial pre-coding matrix of remainder in the initial pre-coding matrix set, by the beginning of the part Beginning pre-coding matrix is used as corresponding extension pre-coding matrix.
Preferably, the initial pre-coding matrix set includes N number of subset, each subset correspondence transmission rank A kind of value, the column vector quantity of the initial pre-coding matrix in a subset is equal to the corresponding transmission of the subset The value of order, N is the integer more than or equal to 1.
Wherein, the column vector arrangement side used when the corresponding initial pre-coding matrix of identical traffic order value extends Formula is identical.
Preferably, in the corresponding all extension pre-coding matrixes of initial pre-coding matrix, any two expands Open up pre-coding matrix column vector in, one extension pre-coding matrix in be mapped to a column vector for code word with The column vector that any code word is mapped in another extension pre-coding matrix is different.
Preferably, if the column vector quantity of initial pre-coding matrix is more than given threshold, the initial precoding The corresponding extension pre-coding matrix of matrix is identical with the initial pre-coding matrix.
Preferably, the terminal carries out CSI measurements according to the extension pre-coding matrix set, including：
The terminal is using the extension pre-coding matrix in the extension pre-coding matrix set as downlink transfer Pre-coding matrix used, according to it is described extension pre-coding matrix set carry out pre-coding matrix instruction PMI, The measurement of one or more CSI in order instruction RI and channel quality indicator (CQI), wherein, the PMI It is the index for extending pre-coding matrix in pre-coding matrix set is extended.
Preferably, the terminal is carried out according to the column vector arrangement mode of agreement to initial pre-coding matrix set Before extension, also include：
The efficient precoding matrix configured information that the terminal sends according to the base station, determines described initial pre- Efficient precoding matrix in encoder matrix set；
The terminal is extended according to the column vector arrangement mode of agreement to initial pre-coding matrix set, wraps Include：
The terminal according to agreement column vector arrangement mode to the initial pre-coding matrix set in have Effect pre-coding matrix is extended.
The CSI feedback method that another embodiment of the present invention is provided, including：
Base station is extended according to the column vector arrangement mode of agreement to initial pre-coding matrix set, is expanded Exhibition pre-coding matrix set；
The CSI that the base station receiving terminal is measured and fed back according to extension pre-coding matrix set, wherein, eventually End carries out CSI measurements and the extension pre-coding matrix set of feedback institute foundation is the terminal according to the agreement Column vector arrangement mode what is obtained is extended to the initial pre-coding matrix set.
Preferably, the base station is carried out according to the column vector arrangement mode of agreement to initial pre-coding matrix set Extension, including：
For the initial pre-coding matrix in part in the initial pre-coding matrix set, row according to agreement to Amount arrangement mode is extended to initial pre-coding matrix set, and be expanded pre-coding matrix；
For the initial pre-coding matrix of remainder in the initial pre-coding matrix set, by the beginning of the part Beginning pre-coding matrix is used as corresponding extension pre-coding matrix.
Preferably, the initial pre-coding matrix set includes N number of subset, each subset correspondence transmission rank A kind of value, the column vector quantity of the initial pre-coding matrix in a subset is equal to the corresponding transmission of the subset The value of order, N is the integer more than or equal to 1.
Wherein, the column vector arrangement side used when the corresponding initial pre-coding matrix of identical traffic order value extends Formula is identical.
Preferably, in the corresponding all extension pre-coding matrixes of initial pre-coding matrix, any two expands Open up pre-coding matrix column vector in, one extension pre-coding matrix in be mapped to a column vector for code word with The column vector that any code word is mapped in another extension pre-coding matrix is different.
Preferably, if the column vector quantity of initial pre-coding matrix is more than given threshold, the initial precoding The corresponding extension pre-coding matrix of matrix is identical with the initial pre-coding matrix.
Preferably, also include：The base station sends efficient precoding matrix configured information to terminal, described to have Effect pre-coding matrix instruction information is used to indicate the efficient precoding square in the initial pre-coding matrix set Battle array.
Terminal provided in an embodiment of the present invention, including：
Expansion module, for being expanded initial pre-coding matrix set according to the column vector arrangement mode of agreement Exhibition, be expanded pre-coding matrix set；
Measurement module, for carrying out CSI measurements according to the extension pre-coding matrix set；
Feedback module, for the CSI measured to base station feedback.
Preferably, the expansion module specifically for：For the part in the initial pre-coding matrix set Initial pre-coding matrix, the column vector arrangement mode according to agreement expands initial pre-coding matrix set Exhibition, be expanded pre-coding matrix；It is initially pre- for remainder in the initial pre-coding matrix set Encoder matrix, using the initial pre-coding matrix in the part as corresponding extension pre-coding matrix.
Preferably, the initial pre-coding matrix set includes N number of subset, each subset correspondence transmission rank A kind of value, the column vector quantity of the initial pre-coding matrix in a subset is equal to the corresponding transmission of the subset The value of order, N is the integer more than or equal to 1.
Wherein, the column vector arrangement side used when the corresponding initial pre-coding matrix of identical traffic order value extends Formula is identical.
Preferably, in the corresponding all extension pre-coding matrixes of initial pre-coding matrix, any two expands Open up pre-coding matrix column vector in, one extension pre-coding matrix in be mapped to a column vector for code word with The column vector that any code word is mapped in another extension pre-coding matrix is different.
Preferably, if the column vector quantity of initial pre-coding matrix is more than given threshold, the initial precoding The corresponding extension pre-coding matrix of matrix is identical with the initial pre-coding matrix.
Preferably, the measurement module specifically for：Extension in the extension pre-coding matrix set is pre- Encoder matrix is carried out as the pre-coding matrix used by downlink transfer according to the extension pre-coding matrix set One or more CSI in pre-coding matrix instruction PMI, order instruction RI and channel quality indicator (CQI) Measurement, wherein, the PMI be extend pre-coding matrix extend pre-coding matrix set in index.
Base station provided in an embodiment of the present invention, including：
Expansion module, for being expanded initial pre-coding matrix set according to the column vector arrangement mode of agreement Exhibition, be expanded pre-coding matrix set；
Receiver module, for the CSI that receiving terminal is measured and fed back according to extension pre-coding matrix set, its In, terminal carries out CSI measurements and the extension pre-coding matrix set of feedback institute foundation is the terminal according to institute The column vector arrangement mode for stating agreement is extended what is obtained to the initial pre-coding matrix set.
Preferably, the expansion module specifically for：For the part in the initial pre-coding matrix set Initial pre-coding matrix, the column vector arrangement mode according to agreement expands initial pre-coding matrix set Exhibition, be expanded pre-coding matrix；It is initially pre- for remainder in the initial pre-coding matrix set Encoder matrix, using the initial pre-coding matrix in the part as corresponding extension pre-coding matrix.
Preferably, the initial pre-coding matrix set includes N number of subset, each subset correspondence transmission rank A kind of value, the column vector quantity of the initial pre-coding matrix in a subset is equal to the corresponding transmission of the subset The value of order, N is the integer more than or equal to 1.
Wherein, the column vector arrangement side used when the corresponding initial pre-coding matrix of identical traffic order value extends Formula is identical.
Preferably, in the corresponding all extension pre-coding matrixes of initial pre-coding matrix, any two expands Open up pre-coding matrix column vector in, one extension pre-coding matrix in be mapped to a column vector for code word with The column vector that any code word is mapped in another extension pre-coding matrix is different.
Preferably, if the column vector quantity of initial pre-coding matrix is more than given threshold, the initial precoding The corresponding extension pre-coding matrix of matrix is identical with the initial pre-coding matrix.
The terminal that another embodiment of the present invention is provided, including：
Transceiver；
Memory, for storing computer program instructions；
Processor, is coupled to the memory, the computer program instructions for reading the memory storage, And as response, perform following operation：
Column vector arrangement mode according to agreement is extended to initial pre-coding matrix set, is expanded pre- Encoder matrix set；
CSI measurements are carried out according to the extension pre-coding matrix set；
The CSI measured to base station feedback.
The base station that another embodiment of the present invention is provided, including：
Transceiver；
Memory, for storing computer program instructions；
Processor, is coupled to the memory, the computer program instructions for reading the memory storage, And as response, perform following operation：
Column vector arrangement mode according to agreement is extended to initial pre-coding matrix set, is expanded pre- Encoder matrix set；
The CSI that receiving terminal is measured and fed back according to extension pre-coding matrix set, wherein, terminal carries out CSI The extension pre-coding matrix of measurement and feedback institute foundation is that the terminal is arranged according to the column vector of the agreement Mode is extended what is obtained to the initial pre-coding matrix set.
In the embodiment of the present invention, terminal is according to the column vector arrangement mode arranged to initial pre-coding matrix set The pre-coding matrix set that is expanded is extended, and CSI is carried out according to the extension pre-coding matrix set Measurement and feedback.Because extension pre-coding matrix set is extended to initial pre-coding matrix set On the basis of obtain, the scale for extending pre-coding matrix is more than initial pre-coding matrix set, therefore based on expansion Exhibition pre-coding matrix set carries out CSI measurements and feedback, than carrying out CSI based on initial pre-coding matrix set Measurement is compared with feedback, and the CSI that terminal can be made to determine and feed back can more reflect actual channel status, enter And reduce the excessive possibility of SINR difference of the multiple data flows for being mapped to same code word.
Brief description of the drawings
Fig. 1 is mimo system structural representation in the prior art by taking single user as an example；
Fig. 2 is a kind of transmission structure schematic diagram of the precoding technique based on codebook mode in the prior art；
The CSI feedback schematic flow sheet realized in end side that Fig. 3 is provided for one embodiment of the present of invention；
The CSI feedback schematic flow sheet realized in base station side that Fig. 4 is provided for one embodiment of the present of invention；
The structural representation of the terminal that Fig. 5 is provided for one embodiment of the present of invention；
The structural representation of the base station that Fig. 6 is provided for one embodiment of the present of invention；
The terminal structure schematic diagram that Fig. 7 is provided for one embodiment of the present of invention；
The architecture of base station schematic diagram that Fig. 8 is provided for one embodiment of the present of invention.
Specific embodiment
Power system capacity is increased using MIMO technology in LTE network, throughput is lifted.Fig. 1 show with Mimo system structured flowchart as a example by single user, its transmitting terminal, such as base station, and receiving terminal, such as Terminal, there is many antennas.In transmitting terminal, the serial code stream of input by series of preprocessing (modulation, Coding, weighting, mapping) the parallel independent substreams in several roads are converted into, sent by different transmitting antennas Go out.In receiving terminal, received using the antenna sets no less than transmission antenna number, and utilization is estimated Channel transfer characteristic and between sending subcode stream certain encoding relation multipath reception signal is carried out spatial domain with Treatment in time-domain, subcode stream is sent so as to isolate several roads, and reconvert is exported into serial data.MIMO Channel is considered as some parallel self-channels, frequency spectrum closely is realized in the case where extra bandwidth is not needed Resource recycling (multiple transmitting antennas are closely with frequency, simultaneous transmission), can greatly expand in theory Exhibition band efficiency, raising wireless transmission rate.
But due to the correlation of channel in channel matrix, the increase of capacity causes interference also corresponding increase, The complexity that interchannel influence is realized is eliminated in order to reduce terminal, while reducing overhead, maximum lift The power system capacity of MIMO, introduces precoding technique in the prior art.In the Physical layer procedures of LTE, Several prevailing transmission patterns of Physical Downlink Shared Channel are realized by precoding.In LTE Rel-8 Closed loop precoding technology is introduced in system and improves spectrum efficiency.Closed loop precoding was required at base station and end first End all preserves the set of same pre-coding matrix, referred to as code book.Generally for feedback overhead is reduced, design During communication system, a code book (i.e. pre-coding matrix set) is constituted usually using several pre-coding matrixes. Terminal measures down channel according to cell CRS (Cell Reference Signal, public guide frequency), estimates After channel information, based on code book set in advance, terminal can select the pre-coding matrix in code book, foundation Prior art, is that all of pre-coding matrix individually determines signal energy, is compared according to certain Optimality Criteria The signal energy of pre-coding matrix, the precoding square that selection is matched the most with current channel condition from code book Battle array, and its corresponding pre-coding matrix index is fed back to by base station by up channel by feedback link.Should Index is designated as PMI (Precoding Matrix Indicator, pre-coding matrix index).Base station is by receiving Index value is assured that the pre-coding matrix that should be used the terminal.Terminal is gone back while PMI is reported Report corresponding RI (Rank Indicator, order instruction) and CQI (Channel Quality Indicator, Channel quality is indicated) so that base station determines what code word number, the number of plies and each code word of downlink transfer were used Modulation coding mode.
In the downlink MIMO transmissions based on code book, the corresponding different number of different lines of the code word in code book According to stream, but current codebook design does not ensure that the reception of the multiple data flows for being mapped to same transmission block SINR is close.If the multiple data flows for being mapped to same transmission block are prelisted using optimal codes After code, the reception SINR difference between them is larger, then these streams use identical modulation coding mode The actual bit rate of each data flow can be caused higher or relatively low, so as to influence data transmission performance, do not reached pre- The spectrum efficiency of phase.
The embodiment of the present invention gives a kind of descending CSI feedback method, and terminal can be according to initial pre-coding matrix The different column vectors of each pre-coding matrix arrange the pre-coding matrix set that is expanded in set, and based on expansion Exhibition pre-coding matrix set carries out CSI measurements and feedback, so as to avoid because being mapped to the multiple of same code word The performance loss that SINR difference between data flow is caused greatly very much.
In embodiments of the present invention, base station can be the evolved base station in LTE system or its evolution system (English be Evolutional Node B, referred to as eNB or e-NodeB), macro base station, micro-base station ( Referred to as " small base station "), femto base station, access website (English is Access Point, referred to as AP) Or transmission website (English is Transmission Point, referred to as TP) etc..
In embodiments of the present invention, terminal be alternatively referred to as user equipment (English for User Equipment, letter Referred to as UE), or (English is Mobile Station, referred to as can be referred to as Terminal, mobile station MS), mobile terminal (English is Mobile Terminal) etc., the terminal can be through wireless access network (Radio Access Network, referred to as RAN) communicated with one or more core nets, for example, terminal can To be mobile phone (or being " honeycomb " phone), the computer with mobile terminal etc., for example, eventually End can also be portable, pocket, hand-held, built-in computer or vehicle-mounted mobile device, it Voice and/or data are exchanged with wireless access network.
For convenience of description, following embodiments will be illustrated by taking base station and terminal as an example.
The embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
Fig. 2 shows a kind of wireless network at present using the precoding technique based on pre-coding matrix aggregate manner Structure, the framework is also applied for the embodiment of the present invention.Specifically, the structure includes base station 201 and terminal 202, And Radio Link 203.Terminal 202 has many antennas with base station 201.Terminal 202 and base station 201 On be configured with identical pre-coding matrix set (code book).Terminal 202 is in measurement down channel and determines After pre-coding matrix, by Radio Link 203 by the corresponding pre-coding matrix index PMI of the pre-coding matrix Feed back to base station 201.Wherein, the CSI of feedback can include：Indicate the channel radio between base station and terminal Believe channel quality CQI, indicate for by transmit signal shaping preferred pre-coding matrix PMI and refer to Show the RI of the quantity of the useful transport layer of the preferred data channel of terminal, and in the estimation of channel coefficients one Plant or much information.The transmission plan that the CSI of feedback enables the configuration of the self adaptation of base station 201 suitable comes Improve covering, or user data transmission speed, or more accurate prediction channel quality is used in the future to terminal 202 Transmission.
In the embodiment of the present invention, can be made an appointment initial pre-coding matrix set in base station side and end side, Pre-coding matrix set can be allocated to terminal by base station.For example, base station can be prelisted by indicating some The configuration parameter of code set of matrices, makes terminal to obtain initial pre-coding matrix according to these parameters.
If being configured with the subset restriction condition of pre-coding matrix set, it is initial that base station and terminal are used Pre-coding matrix is according to agreement (or base station configures) initial pre-coding matrix set and pre-coding matrix What the subset restriction condition of set was obtained.Specifically, the efficient precoding matrix that terminal sends according to base station refers to Show information, it is determined that the efficient precoding matrix in initial pre-coding matrix set.Terminal is in the row according to agreement When vectorial arrangement mode is extended to initial pre-coding matrix set, according to the column vector arrangement mode of agreement Efficient precoding matrix in the initial pre-coding matrix set is extended, be expanded pre-coding matrix Set.
For example, base station and terminal are made an appointment, size is the initial pre-coding matrix set of K, and K represents the collection Initial pre-coding matrix quantity in conjunction, base station indicates the initial pre-coding matrix set by way of bitmap Middle L initial pre-coding matrix is efficient precoding matrix, then terminal carries out pre-coding matrix set expansion institute The initial pre-coding matrix set of foundation, the set being made up of L effective initial pre-coding matrix.Its In, the bitmap can be a binary bit sequence, and amount of bits is equal to K, each bit pair One in initial pre-coding matrix set initial pre-coding matrix is answered, bit value is equal to 1 and represents the bit Effectively, bit value represents the corresponding initial precoding of the bit to the corresponding initial pre-coding matrix in position for 0 Matrix is invalid, and vice versa.
It is the CSI feedback schematic flow sheet that the end side that the embodiment of the present application is provided is realized, such as referring to Fig. 3 Shown in figure, the flow may include following steps：
Step 301：Terminal expands initial pre-coding matrix set according to the column vector arrangement mode of agreement Exhibition, be expanded pre-coding matrix set.
In the step, can make an appointment carries out the extension rule that pre-coding matrix set expansion is used, the expansion Exhibition rule can specifically include one or more column vector arrangement mode.Terminal can according to agreement one kind or Various column vector arrangement modes, the column vector to the initial pre-coding matrix in initial pre-coding matrix set is entered Row arrangement, obtains the corresponding extension pre-coding matrix of the initial pre-coding matrix.Column vector row according to agreement The quantity of row mode, one or more extension precoding squares can be obtained based on an initial pre-coding matrix Battle array, i.e., the corresponding extension pre-coding matrix of one initial pre-coding matrix is one or more.For example, agreement Column vector arrangement mode have N kinds (N is the integer more than 1), then according to the column vector arrangement mode pair After the column vector of one initial pre-coding matrix is ranked up, N number of extension pre-coding matrix is can obtain.
Each initial pre-coding matrix in initial pre-coding matrix set, can be used various column vectors to arrange Mode is extended (in addition to the corresponding initial pre-coding matrixes of rank=1).In the specific implementation, it is right The initial pre-coding matrix in part in initial pre-coding matrix set, can be according to the column vector arrangement side of agreement Formula is extended to initial pre-coding matrix set, and be expanded pre-coding matrix；For initial precoding square The initial pre-coding matrix of remainder in battle array set, can be using the initial pre-coding matrix in the part as corresponding Extension pre-coding matrix.
Used as an example, an initial pre-coding matrix in initial pre-coding matrix set is N × M dimensions Matrix, then the matrix have the column vector of M N × 1 dimension, then the column vector arrangement mode arranged refers to the M The arrangement mode of individual column vector.For example, it is assumed that M=3, then the agreement row of these three column vectors { V1V2V3 } Row mode can include following three kinds (numeral is the index of column vector below)：{1,2,3}{2,1,3}{3,1,2}. Terminal by the N × M dimension matrixes in initial pre-coding matrix set according to three kinds of above-mentioned agreement arrange to After amount arrangement mode is rearranged respectively, three extension pre-coding matrixes can be obtained：[V1V2V3]、 [V2V1V3] and [V3V1V2].
The corresponding pre-coding matrix that extends of all initial pre-coding matrixes constitutes extension pre-coding matrix set.Example Such as, it is assumed that initial pre-coding matrix set sizes are that (L represents the number of initial pre-coding matrix in the set to L Amount, L is the integer more than or equal to 1), and the initial pre-coding matrix in the initial pre-coding matrix set Respectively there is the column vector arrangement mode that P kinds (P is the integer more than or equal to 1) are arranged, then the extension for obtaining is pre- The size of encoder matrix set is L × P.
According to the quantity for being possible to value of rank, respective numbers are may include in initial pre-coding matrix set Subset, a kind of value of each subset correspondence rank, the row of the initial pre-coding matrix in a subset to Amount quantity is equal to the value of the corresponding rank of the subset.Wherein, the quantity of the transport layer that rank expresses possibility or The quantity of person's transmitting data stream, such as, in the case where system supports most 8 streaming, the value of rank 8 kinds of possibility are may include, respectively from 1 to 8.In this case, initial pre-coding matrix set includes 8 subsets, i.e. the corresponding subsets of rank=1, the corresponding subsets of rank=2, the corresponding subsets ... ... of rank=3, By that analogy.Wherein, by taking the corresponding subsets of rank=3 as an example, can be comprising one or more row in the subset The initial pre-coding matrix that vectorial quantity is equal to 3.
The column vector that initial pre-coding matrix in the corresponding subset of value of different rank is used when extending Arrangement mode can be the same or different, identical rank values for initial pre-coding matrix extend when make Column vector arrangement mode is identical.For example, the initial pre-coding matrix extension in the corresponding subsets of rank=3 When the column vector arrangement mode that is used, the initial pre-coding matrix extension in subset corresponding with rank=4 The column vector arrangement mode of Shi Suoyong is different, when the initial pre-coding matrix in the corresponding subsets of rank=3 extends Column vector arrangement mode used is identical.
One more specifically example be：The corresponding subsets of rank=3 include 2 initial pre-coding matrixes (H1, H2), this 2 initial pre-coding matrix (H1, H2) extension when the column vector arrangement mode that uses Including 3 kinds：{ 1,2,3 } { 2,1,3 } { 3,1,2 }, numeral therein represents the index of column vector, such as { 2,1,3 } Represent：By initial pre-coding matrix H1In second column vector as the extension precoding obtained after extension Matrix H1_2First column vector, by H1In first column vector as the H obtained after extension1_2's Second column vector, by H1In the 3rd column vector as the H obtained after extension1_2The 3rd arrange to Amount, so can obtain H1Corresponding 3 extension pre-coding matrixes (H1_1, H1_2, H1_3).Similarly, Initial pre-coding matrix H2Also 3 extension pre-coding matrixes are obtained according to above-mentioned three kinds of column vector extended modes (H2_1, H2_2, H2_3)。
The corresponding subsets of rank=4 include 3 initial pre-coding matrix (H3, H4, H5), at the beginning of this 3 The column vector arrangement mode that beginning pre-coding matrix is used when extending includes 3 kinds： { 1,2,3,4 } { 1,3,2,4 } { Isosorbide-5-Nitrae, 2,3 }, numeral therein represents the index of column vector, and extended mode is the same as those described above, So can obtain H3Corresponding 3 extension pre-coding matrixes (H3_1, H3_2, H3_3).Similarly, initially Pre-coding matrix H4Also 3 extension pre-coding matrix (H are obtained according to above-mentioned three kinds of column vector extended modes4_1, H4_2, H4_3), initial pre-coding matrix H5Also 3 expansions are obtained according to above-mentioned three kinds of column vector extended modes Exhibition pre-coding matrix (H5_1, H5_2, H5_3)。
For the initial pre-coding matrix of rank=N (i.e. column vector quantity is equal to N), its column vector row Row mode can have N！Plant (N！Represent the factorial computing of N, N！=N × (N-1) × (N-2) × ... ×1).Preferably, in the embodiment of the present invention, it is contemplated that the column vector arrangement mode of agreement only reflects difference Column vector different code words distribution information, therefore, the data for same code word carry out precoding The difference of precoding column vector is put in order, or precoding column vector used by two code words is swapped, Belong to equivalent arrangement mode.That is, the corresponding all extension pre-coding matrixes of one initial pre-coding matrix In, in the column vector of any two extension pre-coding matrix, one is mapped in an extension pre-coding matrix The column vector of code word is different from the column vector that any code word is mapped in another extension pre-coding matrix.
For example, it is assumed that a column vector quantity for initial pre-coding matrix is 3, wherein first column vector It is mapped to first code word, second and is mapped to second code word with three column vectors.In theory, column vector Arrangement mode has 6 kinds：{1,2,3}{2,1,3}{3,1,2}{1,3,2}{2,3,1}{3,2,1}.Due to first arrange to Amount is mapped to first code word, and second and three column vectors are mapped to second code word, therefore for { 1,2,3 } { 1,3,2 }, identical column vector is mapped to first code word, i.e., first in initial pre-coding matrix Column vector is mapped to first code word, though second column vector of code word is mapped in both arrangement modes Right arrangement mode is different, but is second in initial pre-coding matrix and the 3rd column vector, therefore, { 1,2,3 } and { 1,3,2 } is considered as equivalent arrangement mode, and one is taken among the two.Similarly, { 2,1,3 } and { 2,3,1 } are equivalent, and { 3,1,2 } and { 3,2,1 } are equivalent, therefore, column vector arrangement mode can only take { 1,2,3 } { 2,1,3 } { 3,1,2 } these three.With the extension pre-coding matrix that { 1,2,3 } arrangement mode is obtained H1_1With the extension pre-coding matrix H obtained with { 2,1,3 } arrangement mode1_2As a example by, it can be seen that H1_1In It is mapped to first column vector of code word (call number is 1 column vector in initial pre-coding matrix) and H1_2 In be mapped to first column vector of code word (call number is 2 column vector in initial pre-coding matrix) and The column vector for being mapped to second code word is different, H1_1In to be mapped to second column vector of code word (initial Call number is 2 and 3 column vector in pre-coding matrix) and H1_2In be mapped to first and second code word Column vector it is different；Similarly, for other any twos extension pre-coding matrix, the rule are also complied with Rule.
Again for example, it is assumed that column vector quantity for initial pre-coding matrix is 4, wherein the first two arrange to Amount is mapped to first code word, and latter two column vector is mapped to second code word.For { 1,2,3,4 } and For { 4,3,2,1 } two kinds of column vector arrangement modes, the column vector { 1,2 } in { 1,2,3,4 } corresponding pre-coding matrix First code word is mapped to, second row of code word is mapped in pre-coding matrix corresponding with { 4,3,2,1 } Vectorial { 2,1 } are identical, therefore both column vector arrangement modes are equivalent, and the two takes one.
Used as an example, table 1 shows column vector arrangement modes of the rank under different value conditions.
Table 1
When actually used, in order to prevent extension pre-coding matrix set excessive, it is possible to use only listed above Part column vector arrangement mode is used as the column vector arrangement mode arranged.Such as, if an initial precoding Matrix column vector quantity is more than given threshold, then the corresponding extension pre-coding matrix of the initial pre-coding matrix It is identical with the initial pre-coding matrix.
For example, when the value of the given threshold is 4, being less than or waiting for column vector number (i.e. rank values) In 4 initial pre-coding matrix, pre-coding matrix can be extended using the column vector arrangement mode in table 1 Calculating；For column vector number more than 4 initial pre-coding matrix, only with the first in table 1 arrange to Amount arrangement mode calculates extension pre-coding matrix, i.e., now column vector need not be resequenced, directly Using the initial pre-coding matrix as extension pre-coding matrix.
Initial codebook that can be only to part Rank is extended, and the initial codebook of other Rank is not expanded Exhibition, directly as extension code book.For example, can only initial codebook to Rank in the range of certain according to Above-mentioned rule is extended the code book that is expanded, and the extended code of other Rank is originally initial codebook.
Step 302：Terminal carries out CSI measurements according to extension pre-coding matrix set.
In the step, terminal can extend extension pre-coding matrix in pre-coding matrix set as descending Transmission pre-coding matrix used, in carrying out PMI, RI and CQI according to extension pre-coding matrix set The measurement of one or more CSI, wherein, PMI is extension pre-coding matrix in extension pre-coding matrix Index in set.That is, under the extension pre-coding matrix that terminal can be based in extension pre-coding matrix set is It is pre-coding matrix it is assumed that carrying out CSI measurements used by row transmission.
Wherein, the method that terminal carries out CSI measurements according to extension pre-coding matrix set, can refer to according to just The method that beginning pre-coding matrix carries out CSI measurements.Such as, terminal can estimate letter according to cell common pilots After road information, an extension pre-coding matrix is selected from extension pre-coding matrix set by certain criterion.Choosing The criterion for taking can maximize mutual channel capacity or maximize to export Signal to Interference plus Noise Ratio etc..
Step 303：The CSI that terminal is measured to base station feedback.
In the step, terminal to be may include in the CSI of base station feedback PMI, RI (Rank Indication, Order instruction) and CQI in one kind or combination.Wherein, the PMI of terminal to report is corresponding pre-coding matrix Index in pre-coding matrix set is extended.Used as an example, terminal calculates extension pre-coding matrix collection Each corresponding channel capacity of extension pre-coding matrix in conjunction, by the extension pre-coding matrix that channel capacity is maximum Corresponding index reports base station as PMI, while by the extension pre-coding matrix corresponding RI and CQI Also base station is reported.
Because in wireless communication field, CSI is the channel attribute of communication link, signal is described in every biography The value of each element, such as signal dispersion in the weak factor on defeated path, i.e. channel gain matrix H (scattering), environment is weak (fading, multipath fading or shadowing fading), distance The information such as decay (power decay of distance).CSI can make communication system adapt to current channel Condition, in multi-antenna systems for the communication of high reliability two-forty provides guarantee.In the embodiment of the present invention In, terminal can by from extension pre-coding matrix set in determine extension pre-coding matrix and this prelist The arrangement mode of the corresponding data transfer layer of code matrix, obtains CSI.
By above description as can be seen that terminal according to agreement column vector arrangement mode to initial precoding square Battle array set is extended the pre-coding matrix set that is expanded, and is carried out according to extension pre-coding matrix set CSI is measured and fed back.Because extension pre-coding matrix set is expanded to initial pre-coding matrix set Obtained on the basis of exhibition, the scale for extending pre-coding matrix is more than initial pre-coding matrix set, therefore base CSI measurements and feedback are carried out in extension pre-coding matrix set, than being carried out based on initial pre-coding matrix set CSI measurements are compared with feedback, and the CSI that terminal can be made to determine and feed back can more reflect actual channel status, And then reduce the excessive possibility of the SINR difference of the multiple data flows for being mapped to same code word.
It is the CSI feedback flow that the base station side that present invention implementation is provided is realized referring to Fig. 4, the flow can be wrapped Include following steps：
Step 401：Base station is expanded initial pre-coding matrix set according to the column vector arrangement mode of agreement Exhibition, be expanded pre-coding matrix set.
Wherein, base station is extended according to the column vector arrangement mode of agreement to initial pre-coding matrix set, Be expanded the method for pre-coding matrix set, with terminal according to the column vector arrangement mode of agreement to initial pre- The method that encoder matrix set is extended the pre-coding matrix set that is expanded is identical, is not repeating herein.
Step 402：The CSI that base station receiving terminal is measured and fed back according to extension pre-coding matrix set.
Wherein, it is the terminal root that terminal carries out CSI measurements and the extension pre-coding matrix set of feedback institute foundation What is obtained is extended to the initial pre-coding matrix set according to the column vector arrangement mode of the agreement, is had Body method is identical with the respective handling process in the CQI feedback flow of end side in previous embodiment, herein not Repeating.Wherein, the column vector arrangement mode of the agreement that base station is used, the agreement used with terminal Column vector arrangement mode is identical.
By above description as can be seen that terminal according to agreement column vector arrangement mode to initial precoding square Battle array set is extended the pre-coding matrix set that is expanded, and is carried out according to extension pre-coding matrix set CSI is measured and fed back.Because extension pre-coding matrix set is expanded to initial pre-coding matrix set Obtained on the basis of exhibition, the scale for extending pre-coding matrix is more than initial pre-coding matrix set, therefore base CSI measurements and feedback are carried out in extension pre-coding matrix set, than being carried out based on initial pre-coding matrix set CSI measurements are compared with feedback, and the CSI that terminal can be made to determine and feed back can more reflect actual channel status, And then reduce the excessive possibility of the SINR difference of the multiple data flows for being mapped to same code word.
In order to be more clearly understood that the embodiment of the present invention, below to the present invention by taking a concrete application scene as an example The process that implements of above-described embodiment is described in detail.
Base station and terminal agreement carry out initial codebook (the code book i.e. precoding square that CSI measurements and feedback are used Battle array set), the initial codebook is the fixed codebook made an appointment, and is wherein had in the initial codebook of rank=i Ni initial pre-coding matrix, i=1,2,3,4.
The column vector arrangement mode that terminal is based on agreement is extended to initial codebook, and be expanded code book.No The column vector arrangement mode arranged with the code book of rank is different, specifically refers to rank=1 in table 1, and 2,3,4 is each Self-corresponding column vector arrangement mode.Initial codebook and extension code book are phases during wherein rank=1 and rank=2 With, initial pre-coding matrix during rank=3 and rank=4 in each initial codebook be based on different row to Amount arrangement mode can be extended to the pre-coding matrix in three extension code books.Obtained based on this extended mode Each rank extension codebook size be { N1, N2,3 × N3,3 × N4 }.
Terminal is based on extension code book and carries out CSI measurements, obtains RI, PMI, CQI and reports base station.Its What middle PMI was indicated is index of the target pre-coding matrix in code book is extended, and each RI values (1-4) are corresponding PMI feedback signaling overheads can be respectively log2 (N1), log2 (N2), log2 (3 × N3), log2 (3 × N4)}。
Base station is extended according to same agreement column vector arrangement mode to the initial codebook arranged, and obtains phase Same extension code book.And after the CSI for receiving terminal to report, phase is found from extension code book according to PMI Pre-coding matrix is answered, for the precoding of downlink transfer.
Based on identical technology design, the embodiment of the present invention additionally provides a kind of terminal.
It is the structural representation of terminal provided in an embodiment of the present invention referring to Fig. 5, the terminal can be realized above-mentioned The CSI feedback flow of end side.As illustrated, the terminal may include：Expansion module 501, measurement module 502 and feedback module 503, wherein：
Expansion module 501, for being entered to initial pre-coding matrix set according to the column vector arrangement mode of agreement Row extension, be expanded pre-coding matrix set；
Measurement module 502, for carrying out CSI measurements according to the extension pre-coding matrix set；
Feedback module 503, for the CSI measured to base station feedback.
Preferably, expansion module 501 can be specifically for：For the portion in the initial pre-coding matrix set Divide initial pre-coding matrix, the column vector arrangement mode according to agreement expands initial pre-coding matrix set Exhibition, be expanded pre-coding matrix；It is initially pre- for remainder in the initial pre-coding matrix set Encoder matrix, using the initial pre-coding matrix in the part as corresponding extension pre-coding matrix.
Preferably, the initial pre-coding matrix set includes N number of subset, each subset correspondence transmission rank A kind of value, the column vector quantity of the initial pre-coding matrix in a subset is equal to the corresponding transmission of the subset The value of order, N is the integer more than or equal to 1.
Wherein, the column vector arrangement side used when the corresponding initial pre-coding matrix of identical traffic order value extends Formula is identical.
Preferably, in the corresponding all extension pre-coding matrixes of initial pre-coding matrix, any two expands Open up pre-coding matrix column vector in, one extension pre-coding matrix in be mapped to a column vector for code word with The column vector that any code word is mapped in another extension pre-coding matrix is different.
Preferably, if the column vector quantity of initial pre-coding matrix is more than given threshold, the initial precoding The corresponding extension pre-coding matrix of matrix is identical with the initial pre-coding matrix.
Preferably, measurement module 502 can be specifically for：By the extension in the extension pre-coding matrix set Pre-coding matrix enters as the pre-coding matrix used by downlink transfer according to the extension pre-coding matrix set One or more CSI in row pre-coding matrix instruction PMI, order instruction RI and channel quality indicator (CQI) Measurement, wherein, the PMI be extend pre-coding matrix extend pre-coding matrix set in index.
Based on identical technology design, the embodiment of the present invention additionally provides a kind of base station.
It is the structural representation of base station provided in an embodiment of the present invention referring to Fig. 6, the terminal can be realized above-mentioned The CSI feedback flow of base station side.As illustrated, the base station may include：Expansion module 601 and receiver module 602, wherein：
Expansion module 601, for being entered to initial pre-coding matrix set according to the column vector arrangement mode of agreement Row extension, be expanded pre-coding matrix set；
Receiver module 602, for the CSI that receiving terminal is measured and fed back according to extension pre-coding matrix set, Wherein, terminal carry out CSI measurements and the extension pre-coding matrix set of feedback institute foundation be the terminal according to The column vector arrangement mode of the agreement is extended what is obtained to the initial pre-coding matrix set.
Preferably, expansion module 601 can be specifically for：For the portion in the initial pre-coding matrix set Divide initial pre-coding matrix, the column vector arrangement mode according to agreement expands initial pre-coding matrix set Exhibition, be expanded pre-coding matrix；It is initially pre- for remainder in the initial pre-coding matrix set Encoder matrix, using the initial pre-coding matrix in the part as corresponding extension pre-coding matrix.
Preferably, the initial pre-coding matrix set includes N number of subset, each subset correspondence transmission rank A kind of value, the column vector quantity of the initial pre-coding matrix in a subset is equal to the corresponding transmission of the subset The value of order, N is the integer more than or equal to 1.
Wherein, the column vector arrangement side used when the corresponding initial pre-coding matrix of identical traffic order value extends Formula is identical.
Preferably, in the corresponding all extension pre-coding matrixes of initial pre-coding matrix, any two expands Open up pre-coding matrix column vector in, one extension pre-coding matrix in be mapped to a column vector for code word with The column vector that any code word is mapped in another extension pre-coding matrix is different.
Preferably, if the column vector quantity of initial pre-coding matrix is more than given threshold, the initial precoding The corresponding extension pre-coding matrix of matrix is identical with the initial pre-coding matrix.
Based on identical technology design, the embodiment of the present invention additionally provides a kind of terminal.
It is the structural representation of terminal provided in an embodiment of the present invention referring to Fig. 7, the terminal can be realized above-mentioned The CSI feedback flow of end side.As illustrated, the terminal may include：Processor 701, memory 702, Transceiver 703 and EBI.
Processor 701 is responsible for bus architecture and common treatment, and memory 702 can store processor 701 data used when operation is performed.Transceiver 703 is used to be received under the control of processor 701 With transmission data.
Bus architecture can include the bus and bridge of any number of interconnection, specifically be represented by processor 701 The various circuits of the memory that one or more processors and memory 702 are represented are linked together.Total coil holder Structure can also link various other circuits of such as ancillary equipment, voltage-stablizer and management circuit or the like Together, these are all it is known in the art, therefore, being no longer described further to it herein.Always Line interface provides interface.Processor 701 is responsible for bus architecture and common treatment, and memory 702 can To store the data that processor 701 is used when operation is performed.
The signal processing flow that the embodiment of the present invention is disclosed, in can apply to processor 701, or by Reason device 701 is realized.In implementation process, each step of signal processing flow can be by processor 701 Hardware integrated logic circuit or software form instruction complete.Processor 701 can be general procedure Device, digital signal processor, application specific integrated circuit, field programmable gate array or other FPGAs Device, discrete gate or transistor logic, discrete hardware components, it is possible to achieve or perform the present invention Disclosed each method, step and logic diagram in embodiment.General processor can be microprocessor or Any conventional processor etc..The step of method with reference to disclosed in the embodiment of the present invention, can be embodied directly in Hardware processor performs completion, or performs completion with the hardware in processor and software module combination.Software Module may be located at random access memory, flash memory, read-only storage, programmable read only memory or electrically erasable In writing the ripe storage medium in this areas such as programmable storage, register.The storage medium is located at memory 702, processor 701 reads the information in memory 702, and signal processing flow is completed with reference to its hardware Step.
Specifically, processor 701, for reading the program in memory 702, perform following process：
Column vector arrangement mode according to agreement is extended to initial pre-coding matrix set, is expanded pre- Encoder matrix set；
CSI measurements are carried out according to the extension pre-coding matrix set；
The CSI measured to base station feedback by transceiver 703.
Preferably, processor 701 can be specifically for：For the part in the initial pre-coding matrix set Initial pre-coding matrix, the column vector arrangement mode according to agreement expands initial pre-coding matrix set Exhibition, be expanded pre-coding matrix；It is initially pre- for remainder in the initial pre-coding matrix set Encoder matrix, using the initial pre-coding matrix in the part as corresponding extension pre-coding matrix.
Preferably, the initial pre-coding matrix set includes N number of subset, each subset correspondence transmission rank A kind of value, the column vector quantity of the initial pre-coding matrix in a subset is equal to the corresponding transmission of the subset The value of order, N is the integer more than or equal to 1.
Wherein, the column vector arrangement side used when the corresponding initial pre-coding matrix of identical traffic order value extends Formula is identical.
Preferably, in the corresponding all extension pre-coding matrixes of initial pre-coding matrix, any two expands Open up pre-coding matrix column vector in, one extension pre-coding matrix in be mapped to a column vector for code word with The column vector that any code word is mapped in another extension pre-coding matrix is different.
Preferably, if the column vector quantity of initial pre-coding matrix is more than given threshold, the initial precoding The corresponding extension pre-coding matrix of matrix is identical with the initial pre-coding matrix.
Preferably, processor 701 can be specifically for：Extension in the extension pre-coding matrix set is pre- Encoder matrix is carried out as the pre-coding matrix used by downlink transfer according to the extension pre-coding matrix set One or more CSI in pre-coding matrix instruction PMI, order instruction RI and channel quality indicator (CQI) Measurement, wherein, the PMI be extend pre-coding matrix extend pre-coding matrix set in index.
Based on identical technology design, the embodiment of the present invention additionally provides a kind of base station.
It is the structural representation of base station provided in an embodiment of the present invention referring to Fig. 8, the terminal can be realized above-mentioned The CSI feedback flow of base station side.As illustrated, the base station may include：Processor 801, memory 802, Transceiver 803 and EBI.
Processor 801 is responsible for bus architecture and common treatment, and memory 802 can store processor 801 data used when operation is performed.Transceiver 803 is used to be received under the control of processor 801 With transmission data.
Bus architecture can include the bus and bridge of any number of interconnection, specifically be represented by processor 801 The various circuits of the memory that one or more processors and memory 802 are represented are linked together.Total coil holder Structure can also link various other circuits of such as ancillary equipment, voltage-stablizer and management circuit or the like Together, these are all it is known in the art, therefore, being no longer described further to it herein.Always Line interface provides interface.Processor 801 is responsible for bus architecture and common treatment, and memory 802 can To store the data that processor 801 is used when operation is performed.
The signal processing flow that the embodiment of the present invention is disclosed, in can apply to processor 801, or by Reason device 801 is realized.In implementation process, each step of signal processing flow can be by processor 801 Hardware integrated logic circuit or software form instruction complete.Processor 801 can be general procedure Device, digital signal processor, application specific integrated circuit, field programmable gate array or other FPGAs Device, discrete gate or transistor logic, discrete hardware components, it is possible to achieve or perform the present invention Disclosed each method, step and logic diagram in embodiment.General processor can be microprocessor or Any conventional processor etc..The step of method with reference to disclosed in the embodiment of the present invention, can be embodied directly in Hardware processor performs completion, or performs completion with the hardware in processor and software module combination.Software Module may be located at random access memory, flash memory, read-only storage, programmable read only memory or electrically erasable In writing the ripe storage medium in this areas such as programmable storage, register.The storage medium is located at memory 802, processor 801 reads the information in memory 802, and signal processing flow is completed with reference to its hardware Step.
Specifically, processor 801, for reading the program in memory 802, perform following process：
Column vector arrangement mode according to agreement is extended to initial pre-coding matrix set, is expanded pre- Encoder matrix set；
The CSI for measuring and feeding back according to extension pre-coding matrix set by the receiving terminal of transceiver 803, its In, terminal carries out CSI measurements and the extension pre-coding matrix set of feedback institute foundation is the terminal according to institute The column vector arrangement mode for stating agreement is extended what is obtained to the initial pre-coding matrix set.
Preferably, processor 801 can be specifically for：For the part in the initial pre-coding matrix set Initial pre-coding matrix, the column vector arrangement mode according to agreement expands initial pre-coding matrix set Exhibition, be expanded pre-coding matrix；It is initially pre- for remainder in the initial pre-coding matrix set Encoder matrix, using the initial pre-coding matrix in the part as corresponding extension pre-coding matrix.
Preferably, the initial pre-coding matrix set includes N number of subset, each subset correspondence transmission rank A kind of value, the column vector quantity of the initial pre-coding matrix in a subset is equal to the corresponding transmission of the subset The value of order, N is the integer more than or equal to 1.
Wherein, the column vector arrangement side used when the corresponding initial pre-coding matrix of identical traffic order value extends Formula is identical.
Preferably, in the corresponding all extension pre-coding matrixes of initial pre-coding matrix, any two expands Open up pre-coding matrix column vector in, one extension pre-coding matrix in be mapped to a column vector for code word with The column vector that any code word is mapped in another extension pre-coding matrix is different.
Preferably, if the column vector quantity of initial pre-coding matrix is more than given threshold, the initial precoding The corresponding extension pre-coding matrix of matrix is identical with the initial pre-coding matrix.
Described on end, the embodiment of the present invention adds different column vectors by initial pre-coding matrix set Put in order, can make terminal that different code words to the mapping of data flow are traveled through when carrying out CSI feedback, so that Allow the detection SINR of the multiple data flows for being mapped to same code word to be closer to, reduce base station according to terminal After the CQI of feedback is modulated coding, the modulation coding mode for some data flows occur is too high or too low Phenomenon, improves the spectrum efficiency of transmission.
The present invention is produced with reference to method according to embodiments of the present invention, equipment (system) and computer program The flow chart and/or block diagram of product is described.It should be understood that can by computer program instructions realize flow chart and / or block diagram in each flow and/or the flow in square frame and flow chart and/or block diagram and/ Or the combination of square frame.These computer program instructions to all-purpose computer, special-purpose computer, insertion can be provided The processor of formula processor or other programmable data processing devices is producing a machine so that by calculating The instruction of the computing device of machine or other programmable data processing devices is produced for realizing in flow chart one The device of the function of being specified in individual flow or multiple one square frame of flow and/or block diagram or multiple square frames.
These computer program instructions may be alternatively stored in can guide computer or the treatment of other programmable datas to set In the standby computer-readable memory for working in a specific way so that storage is in the computer-readable memory Instruction produce include the manufacture of command device, the command device realization in one flow of flow chart or multiple The function of being specified in one square frame of flow and/or block diagram or multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices, made Obtain and series of operation steps is performed on computer or other programmable devices to produce computer implemented place Reason, so as to the instruction performed on computer or other programmable devices is provided for realizing in flow chart one The step of function of being specified in flow or multiple one square frame of flow and/or block diagram or multiple square frames.
, but those skilled in the art once know base although preferred embodiments of the present invention have been described This creative concept, then can make other change and modification to these embodiments.So, appended right will Ask and be intended to be construed to include preferred embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification without deviating from this hair to the present invention Bright spirit and scope.So, if it is of the invention these modification and modification belong to the claims in the present invention and Within the scope of its equivalent technologies, then the present invention is also intended to comprising these changes and modification.

Claims (28)

1. a kind of CSI back method, it is characterised in that including：
Terminal is extended according to the column vector arrangement mode of agreement to initial pre-coding matrix set, is expanded Exhibition pre-coding matrix set；
The terminal carries out CSI measurements according to the extension pre-coding matrix set；
The CSI that the terminal is measured to base station feedback.
2. the method for claim 1, it is characterised in that column vector of the terminal according to agreement Arrangement mode is extended to initial pre-coding matrix set, including：
For the initial pre-coding matrix in part in the initial pre-coding matrix set, row according to agreement to Amount arrangement mode is extended to initial pre-coding matrix set, and be expanded pre-coding matrix；
For the initial pre-coding matrix of remainder in the initial pre-coding matrix set, by the beginning of the part Beginning pre-coding matrix is used as corresponding extension pre-coding matrix.
3. the method for claim 1, it is characterised in that the initial pre-coding matrix set bag Containing N number of subset, a kind of value of each subset correspondence transmission rank, the initial pre-coding matrix in a subset Column vector quantity be equal to the corresponding transmission rank of the subset value, N is the integer more than or equal to 1.
4. method as claimed in claim 3, it is characterised in that identical traffic order value is corresponding initial The column vector arrangement mode that pre-coding matrix is used when extending is identical.
5. the method for claim 1, it is characterised in that an initial pre-coding matrix is corresponding In all extension pre-coding matrixes, in the column vector of any two extension pre-coding matrix, an extension prelists A column vector for code word is mapped in code matrix, any code is mapped in extending pre-coding matrix with another The column vector of word is different.
6. the method for claim 1, it is characterised in that if the column vector of initial pre-coding matrix Quantity is more than given threshold, then the corresponding pre-coding matrix that extends of the initial pre-coding matrix initially prelists with this Code matrix is identical.
7. the method as any one of claim 1 to 6, it is characterised in that the terminal according to The extension pre-coding matrix set carries out CSI measurements, including：
The terminal is using the extension pre-coding matrix in the extension pre-coding matrix set as downlink transfer Pre-coding matrix used, according to it is described extension pre-coding matrix set carry out pre-coding matrix instruction PMI, The measurement of one or more CSI in order instruction RI and channel quality indicator (CQI), wherein, the PMI It is the index for extending pre-coding matrix in pre-coding matrix set is extended.
8. the method as any one of claim 1 to 6, it is characterised in that the terminal according to Before the column vector arrangement mode of agreement is extended to initial pre-coding matrix set, also include：
The efficient precoding matrix configured information that the terminal sends according to the base station, determines described initial pre- Efficient precoding matrix in encoder matrix set；
The terminal is extended according to the column vector arrangement mode of agreement to initial pre-coding matrix set, wraps Include：
The terminal according to agreement column vector arrangement mode to the initial pre-coding matrix set in have Effect pre-coding matrix is extended.
9. a kind of CSI back method, it is characterised in that including：
Base station is extended according to the column vector arrangement mode of agreement to initial pre-coding matrix set, is expanded Exhibition pre-coding matrix set；
The CSI that the base station receiving terminal is measured and fed back according to extension pre-coding matrix set, wherein, eventually End carries out CSI measurements and the extension pre-coding matrix set of feedback institute foundation is the terminal according to the agreement Column vector arrangement mode what is obtained is extended to the initial pre-coding matrix set.
10. method as claimed in claim 9, it is characterised in that column vector of the base station according to agreement Arrangement mode is extended to initial pre-coding matrix set, including：
For the initial pre-coding matrix in part in the initial pre-coding matrix set, row according to agreement to Amount arrangement mode is extended to initial pre-coding matrix set, and be expanded pre-coding matrix；
For the initial pre-coding matrix of remainder in the initial pre-coding matrix set, by the beginning of the part Beginning pre-coding matrix is used as corresponding extension pre-coding matrix.
11. methods as claimed in claim 9, it is characterised in that the initial pre-coding matrix set bag Containing N number of subset, a kind of value of each subset correspondence transmission rank, the initial pre-coding matrix in a subset Column vector quantity be equal to the corresponding transmission rank of the subset value, N is the integer more than or equal to 1.
12. methods as claimed in claim 11, it is characterised in that identical traffic order value is corresponding just The column vector arrangement mode that beginning pre-coding matrix is used when extending is identical.
13. methods as claimed in claim 9, it is characterised in that an initial pre-coding matrix is corresponding In all extension pre-coding matrixes, in the column vector of any two extension pre-coding matrix, an extension prelists Code matrix in be mapped to a column vector for code word with another extension pre-coding matrix in be mapped to any code The column vector of word is different.
14. methods as claimed in claim 9, it is characterised in that if the column vector of initial pre-coding matrix Quantity is more than given threshold, then the corresponding pre-coding matrix that extends of the initial pre-coding matrix initially prelists with this Code matrix is identical.
15. method as any one of claim 9 to 13, it is characterised in that also include：
The base station sends efficient precoding matrix configured information to terminal, and the efficient precoding matrix is indicated Information is used to indicate the efficient precoding matrix in the initial pre-coding matrix set.
A kind of 16. terminals, it is characterised in that including：
Expansion module, for being expanded initial pre-coding matrix set according to the column vector arrangement mode of agreement Exhibition, be expanded pre-coding matrix set；
Measurement module, for carrying out CSI measurements according to the extension pre-coding matrix set；
Feedback module, for the CSI measured to base station feedback.
17. terminals as claimed in claim 16, it is characterised in that the expansion module specifically for：
For the initial pre-coding matrix in part in the initial pre-coding matrix set, row according to agreement to Amount arrangement mode is extended to initial pre-coding matrix set, and be expanded pre-coding matrix；
For the initial pre-coding matrix of remainder in the initial pre-coding matrix set, by the beginning of the part Beginning pre-coding matrix is used as corresponding extension pre-coding matrix.
18. terminals as claimed in claim 16, it is characterised in that the initial pre-coding matrix set Comprising N number of subset, a kind of value of each subset correspondence transmission rank, the initial precoding square in a subset The column vector quantity of battle array is equal to the value of the corresponding transmission rank of the subset, and N is the integer more than or equal to 1.
19. terminals as claimed in claim 18, it is characterised in that identical traffic order value is corresponding just The column vector arrangement mode that beginning pre-coding matrix is used when extending is identical.
20. terminals as claimed in claim 16, it is characterised in that an initial pre-coding matrix correspondence All extension pre-coding matrixes in, in the column vector of any two extension pre-coding matrix, an extension is pre- Be mapped in encoder matrix a column vector for code word with another extension pre-coding matrix in be mapped to it is any The column vector of code word is different.
21. terminals as claimed in claim 16, it is characterised in that if the row of initial pre-coding matrix to Amount quantity is more than given threshold, then the corresponding extension pre-coding matrix of the initial pre-coding matrix is initial pre- with this Encoder matrix is identical.
22. terminal as any one of claim 16 to 21, it is characterised in that the measurement mould Block specifically for：
Will be pre- used by the extension pre-coding matrix as downlink transfer in the extension pre-coding matrix set Encoder matrix, pre-coding matrix instruction PMI, order instruction are carried out according to the extension pre-coding matrix set The measurement of one or more CSI in RI and channel quality indicator (CQI), wherein, the PMI is to expand Index of the exhibition pre-coding matrix in pre-coding matrix set is extended.
A kind of 23. base stations, it is characterised in that including：
Expansion module, for being expanded initial pre-coding matrix set according to the column vector arrangement mode of agreement Exhibition, be expanded pre-coding matrix set；
Receiver module, for the CSI that receiving terminal is measured and fed back according to extension pre-coding matrix set, its In, terminal carries out CSI measurements and the extension pre-coding matrix set of feedback institute foundation is the terminal according to institute The column vector arrangement mode for stating agreement is extended what is obtained to the initial pre-coding matrix set.
24. base stations as claimed in claim 23, it is characterised in that the expansion module specifically for：
For the initial pre-coding matrix in part in the initial pre-coding matrix set, row according to agreement to Amount arrangement mode is extended to initial pre-coding matrix set, and be expanded pre-coding matrix；
For the initial pre-coding matrix of remainder in the initial pre-coding matrix set, by the beginning of the part Beginning pre-coding matrix is used as corresponding extension pre-coding matrix.
25. base stations as claimed in claim 23, it is characterised in that the initial pre-coding matrix set Comprising N number of subset, a kind of value of each subset correspondence transmission rank, the initial precoding square in a subset The column vector quantity of battle array is equal to the value of the corresponding transmission rank of the subset, and N is the integer more than or equal to 1.
26. base stations as claimed in claim 25, it is characterised in that identical traffic order value is corresponding just The column vector arrangement mode that beginning pre-coding matrix is used when extending is identical.
27. base stations as claimed in claim 23, it is characterised in that an initial pre-coding matrix correspondence All extension pre-coding matrixes in, in the column vector of any two extension pre-coding matrix, an extension is pre- Be mapped in encoder matrix a column vector for code word with another extension pre-coding matrix in be mapped to it is any The column vector of code word is different.
28. base stations as claimed in claim 23, it is characterised in that if the row of initial pre-coding matrix to Amount quantity is more than given threshold, then the corresponding extension pre-coding matrix of the initial pre-coding matrix is initial pre- with this Encoder matrix is identical.
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