CN110535498A - CSI back method and apparatus - Google Patents

CSI back method and apparatus Download PDF

Info

Publication number
CN110535498A
CN110535498A CN201811625788.XA CN201811625788A CN110535498A CN 110535498 A CN110535498 A CN 110535498A CN 201811625788 A CN201811625788 A CN 201811625788A CN 110535498 A CN110535498 A CN 110535498A
Authority
CN
China
Prior art keywords
coefficient
feedback
base vector
base
vector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201811625788.XA
Other languages
Chinese (zh)
Other versions
CN110535498B (en
Inventor
郑国增
吴昊
李永
李儒岳
鲁照华
陈艺戬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to CN201811625788.XA priority Critical patent/CN110535498B/en
Publication of CN110535498A publication Critical patent/CN110535498A/en
Priority to PCT/CN2019/128653 priority patent/WO2020135573A1/en
Application granted granted Critical
Publication of CN110535498B publication Critical patent/CN110535498B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]

Landscapes

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

Abstract

The embodiment of the invention discloses a kind of CSI back method and apparatus, wherein one of mode includes: terminal feeding back precoding matrix information, and the precoding matrix information includes the first base vector information, the second base vector information, the amplitude and phase information of the second coefficient；Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector is fed back, weighting coefficient used in the first base vector linear combining is the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, vector composed by first coefficient corresponding to same first base vector is the linear combining of the second base vector, and second coefficient is that second base vector carries out weighting coefficient used in linear combining.In this way, CSI feedback expense can either be reduced, higher CSI feedback performance is in turn ensured.

Description

CSI back method and apparatus
Technical field
The present embodiments relate to but be not limited to wireless communication technique, more particularly relate to a kind of channel state information CSI Feedback method and equipment.
Background technique
In MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) wireless communication system, lead to It crosses and precoding or beam forming is carried out to more transmission antennas, can achieve the purpose for promoting efficiency of transmission and reliability.In order to Realize that high performance precoding or beam forming, pre-coding matrix or beam forming vector need relatively good match channels, this Just need transmitting terminal that can preferably obtain channel state information (Channel State Information, CSI).Therefore, CSI Feedback is to realize the key technology of high-performance precoding or beam forming in mimo systems.However, carry out CSI feedback when It waits, bigger feedback overhead can be brought to the quantization feedback of channel matrix, when especially supporting the CSI feedback of big bandwidth, instead Feedback expense is the major issue that limiting performance is promoted
Summary of the invention
In view of this, the embodiment of the invention provides a kind of CSI back methods, comprising: terminal feedback Precoding matrix information, the precoding matrix information include the first base vector information, the second base vector information, the second coefficient Amplitude and phase information；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector, the first base vector line are fed back Property merge used in weighting coefficient be the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same Vector composed by first coefficient of one first base vector is the linear combining of the second base vector, second coefficient Weighting coefficient used in linear combining is carried out for second base vector.
The embodiment of the invention also provides a kind of CSI back methods, comprising:
Base station receives the precoding matrix information of terminal feedback, and the precoding matrix information is believed including the first base vector Breath, the second base vector information, the amplitude and phase information of the second coefficient；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector, the first base vector line are fed back Property merge used in weighting coefficient be the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same Vector composed by first coefficient of one first base vector is the linear combining of the second base vector, second coefficient Weighting coefficient used in linear combining is carried out for second base vector.
The embodiment of the invention also provides a kind of terminals, comprising:
Feedback unit, be used for feeding back precoding matrix information, the precoding matrix information include the first base vector information, Second base vector information, the amplitude and phase information of the second coefficient；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector, the first base vector line are fed back Property merge used in weighting coefficient be the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same Vector composed by first coefficient of one first base vector is the linear combining of the second base vector, second coefficient Weighting coefficient used in linear combining is carried out for second base vector.
The embodiment of the invention also provides a kind of base stations, comprising:
Receiving unit, for receiving the precoding matrix information of terminal feedback, the precoding matrix information includes first Base vector information, the second base vector information, the amplitude and phase information of the second coefficient；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector, the first base vector line are fed back Property merge used in weighting coefficient be the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same Vector composed by first coefficient of one first base vector is the linear combining of the second base vector, second coefficient Weighting coefficient used in linear combining is carried out for second base vector.
The embodiment of the invention also provides a kind of terminal, including memory, processor and it is stored on the memory simultaneously The computer program that can be run on the processor, the computer program realize above-mentioned terminal when being executed by the processor The method of the CSI back of execution.
The embodiment of the invention also provides a kind of base station, including memory, processor and it is stored on the memory simultaneously The computer program that can be run on the processor, the computer program realize above-mentioned base station when being executed by the processor The method of the CSI back of execution.
The embodiment of the invention also provides a kind of computer readable storage mediums, which is characterized in that described computer-readable It is stored with message handling program on storage medium, is realized described in any of the above-described when the message handling program is executed by processor The method of CSI back.
Compared with the relevant technologies, the embodiment of the invention provides a kind of CSI back method and apparatus, lead to Feedback the first base vector information, the amplitude and phase information of the second base vector information and the second coefficient are crossed, it is anti-CSI can either to be reduced Expense is presented, in turn ensures higher CSI feedback performance.
Other features and advantages of the present invention will be illustrated in the following description.
Detailed description of the invention
Fig. 1 is the flow diagram for the CSI back method that embodiment of the present invention one provides；
Fig. 2 is the flow diagram for the CSI back method that embodiment of the present invention two provides；
Fig. 3 is the flow diagram for the CSI back method that the embodiment of the present invention one provides
Fig. 4 is the flow diagram of CSI back method provided by Embodiment 2 of the present invention；
Fig. 5 is the structural schematic diagram for the terminal that embodiment of the present invention three provides；
Fig. 6 is the structural schematic diagram for the base station that embodiment of the present invention four provides.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention Embodiment be described in detail.
Step shown in the flowchart of the accompanying drawings can be in a computer system such as a set of computer executable instructions It executes.Also, although logical order is shown in flow charts, and it in some cases, can be to be different from herein suitable Sequence executes shown or described step.
CSI quantization feedback technique is an important component of MIMO technology.In traditional wireless communication system, lead to It is often used the variation shape of DFT (Discrete Fourier Transform, discrete Fourier transform) vector or DFT vector Formula, for example, multiple DFT vectors Kronecker product perhaps the cascade form of DFT vector or to cascade DFT vector carry out The form of phase adjustment, terminal is by quantization feedback, by the precoding instruction information reporting of above-mentioned form to base station.This seed type Precoding codebook can be classified as first kind code book, this code book expense is smaller, but CSI quantified precision is lower, performance compared with It is limited.Another code book carries out linear weighted function merging by the Kronecker product to DFT vector or DFT vector, is weighted Combined vector is known as code book base vector, using code book base vector relevant information, the amplitude and phase information of weighting coefficient as pre- Coding indication information feeds back to base station, and such precoding codebook can be classified as the second class code book.Specifically, the second class code book skill In art, the columns of the pre-coding matrix of terminal feedback, i.e. channel sequence are RI (Rank indicator, order instruction), wherein each The precoding vectors of layer are expressed as the linear combining of one group of code book base vector, this group of code book base vector can be described as the first base vector, Terminal calculates the weighting coefficient of linear combining according to the first base vector, and quantifies the amplitude and phase letter of feedback weight coefficient Breath, the weighting coefficient are properly termed as the first coefficient.In order to promote the performance of feedback, it usually needs by the amplitude and phase of the first coefficient Position information is reported by subband.The subband is a kind of frequency domain granularity, for all RB for including in CSI feedback bandwidth Continuous multiple RB are constituted a subband by (Resource block, resource block).
For above-mentioned CSI feedback method, a certain layer can be indicated in the precoding of a subband are as follows:
Wherein, W1Contain 2L the first base vectors, W1Dimension is Nt× 2L, form are as follows:
Wherein b0,b1,…,bL-1It is made of the Kronecker product of one group of orthogonal DFT vector or DFT vector, dimension isWherein NtIndicate CSI-RS (Channel State Information Reference Signal, channel status letter Cease reference signal) port number.This CSI feedback mode uses identical DFT vector to the antenna port of different polarization directions Or the Kronecker product of DFT vector, so W1Contain 2L the first base vectors.In general, W1In information be broadband feedback , i.e., for subband different in entire CSI feedback frequency band, W1In information be the same.Dimension be 2L × 1, indicate The weighting coefficient of 2L the first base vectors, referred to as the first coefficient.
It in general, is the performance for promoting the second class code book, terminal is needed for each code book basic vector of each subband feedback The phase and/or amplitude information of the weighting coefficient of amount.Therefore, when subband number is more second class code book feedback can bring it is larger CSI feedback expense.It on the other hand, can not if only information of the amplitude or phase of feedback weight coefficient on entire broadband Sufficiently obtaining the second class code book feedback being capable of bring high performance gains.Therefore, how by lesser feedback overhead, obtain compared with The second high class code book feedback performance, is the unsolved problem of current techniques.
For this purpose, the embodiment of the invention provides a kind of new CSI back schemes, with this solution, i.e., CSI feedback expense can be reduced, while can guarantee higher CSI feedback performance again.
Embodiment one
Fig. 1 is the flow diagram for the CSI back method that embodiment of the present invention one provides, such as Fig. 1 It is shown, this method comprises:
Step 101, terminal feeding back precoding matrix information, the precoding matrix information include the first base vector information, Second base vector information, the amplitude and phase information of the second coefficient；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector, the first base vector line are fed back Property merge used in weighting coefficient be the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same Vector composed by first coefficient of one first base vector is the linear combining of the second base vector, second coefficient Weighting coefficient used in linear combining is carried out for second base vector.
Wherein, second base vector indicates the K DFT basic vector selected from DFT matrix or over-sampling DFT matrix Amount, the oversample factor O of the over-sampling DFT matrixfValue be one of the following: 1,2,4,8.
Wherein, before terminal feeding back precoding matrix information, this method further include:
The frequency domain for needing to feed back CSI that base station is sent is received, the frequency domain of the CSI includes: to need to feed back CSI Precoding subband perhaps need the precoding subband of comb feedback CSI and sparse degree or do not need feedback CSI and prelist Numeral band；
When pectination configuration in base station needs to feed back the precoding subband of precoding information, one of in the following manner amendment the Two base vectors:
Mode one: base station configures biggish oversample factor, increases selectable DFT matrix number；
Mode two: the precoding subband for the precoding information that terminal is fed back as needed, pectination intercept DFT base vector；
Alternatively, clipping and not needed described in DFT base vector when base station configuration section does not need the subband of feedback precoding Feed back the corresponding position element of the precoding subband of precoding information；
Alternatively, whether base station configuration by second base vector does phase rotation, with the most intermediate numeral that prelists of configuration Band is reference.
Wherein, the CSI feedback frequency band refers to that base station configuration needs to feed back the frequency domain of CSI.
Wherein, the precoding subband is a frequency domain unit, it includes RB number by base station configure or by CSI it is anti- The RB number and used second base vector number that feedback frequency band includes determine, i.e., are comprising RB number RBNum is the RB number for including in the CSI feedback frequency band, and K is the second base vector number that the CSI feedback frequency band uses.
Wherein, second coefficient is expressed as Dimension be 2L × K, 2L representing matrix W1In include 2L the One base vector, K representing matrix W3In include K the second base vectors.
Wherein, before terminal feeding back precoding matrix information, this method further include:
Receive the feedback system and feedback subset instruction of the second coefficient that base station is sent；
The second coefficient in the precoding matrix information is fed back one of in the following manner:
Mode one: the amplitude size according to the second coefficient is that priority feeds back the second coefficient；
Mode two: the second coefficient is fed back by priority of first base vector；
Mode three: the second coefficient is fed back by priority of second base vector；
Mode four: being divided into two groups for first base vector, arrives the first base vector of l-th, i.e. W for the 1st1The the 1st to L column vector, as first group, by L+1 to 2L the first base vectors, i.e. W1L+1 to the 2L column vector, as Second group, the second coefficient is fed back according to the priority of packets inner；
Mode five: being grouped the second coefficient, feeds back the second coefficient according to the priority of grouping.
Wherein, the mode one includes:
It is ranked up with the amplitude size of the second coefficient, from big to small selected part coefficient, until the part coefficient The sum of power and the ratio of the second coefficient general power are not less than δ, and terminal feeds back the part coefficient, and wherein δ is preset threshold；
The coefficient of its selection is indicated using the bit diagram of 2LK size.
Wherein, the mode two includes:
Mode A: l is selected in K weighting coefficient of the first optimal base vector0A coefficient, in remaining each first base L is respectively selected in K weighting coefficient of vector1A coefficient, l1< l0, it is using what the bit diagram of 2LK size indicated its selection Number；
Alternatively, mode B: selecting l in K weighting coefficient of the first optimal base vector0A coefficient, remaining first In all weighting coefficients of base vector, reselection M-l in total0A coefficient is fed back, and the value of M is configured by base station or isWherein δMFor preset threshold；It uses the subset of its selection of one of following submode feedback: submode B-1: using The bit diagram of 2LK size indicates the coefficient of its selection；Submode B-2: it usesIndicate optimal the of selection One base vector, then useIndicate remaining M-l of its selection0A coefficient；
Alternatively, mode C: being ranked up to 2L the first base vectors, from by force into the weighting coefficient of the first weak base vector L is chosen respectively0,l0- 1 ..., l0- M+1 coefficients are fed back, and are using what the bit diagram of 2LK size indicated its selection Number.
Wherein, the mode three includes:
Mode D selects l in 2L weighting coefficient of the second optimal base vector0A coefficient, in remaining the second basic vector In all weighting coefficients of amount, reselection M-l in total0The value of a coefficient, M is configured by base station or isWherein δMFor preset threshold；It uses the subset of its selection of one of following submode feedback: submode D-1: using the bit of 2LK size The coefficient of its selection of figure instruction；Submode D-2: it usesIt indicates optimal second base vector of selection, then usesIndicate remaining M-l of its selection0A coefficient；
Alternatively, mode E: being ranked up to K the second base vectors, from by force to the weighting coefficient difference of the second weak base vector Choose l0,l0- 1 ..., l0- M+1 coefficients, the coefficient of its selection is indicated using the bit diagram of 2LK size.
Wherein, the mode four includes:
Mode F: each to feed back in being grouped at two in all weighting coefficients of the first base vectorA coefficient,Value by Base station configures or isWherein δMFor preset threshold；By bit diagram orInstruction choosing The coefficient selected；
Alternatively, mode G: in two groupings, feed back according to the priority of the first base vector and use 2LK size Bit diagram indicate the coefficient of its selection, comprising: submode G-1: in two grouping one the first optimal base vectors of each selection, L is respectively selected in the weighting coefficient of two the first optimal base vectors0A coefficient, remaining the first base vector in two groupings Each reselection in all weighting coefficientsA coefficient,Value by base station configure or beWherein δMFor Preset threshold；Or submode G-2: in two grouping one the first optimal base vectors of each selection, two the first optimal bases Each l in the weighting coefficient of vector0A coefficient, each reselection l in the weighting coefficient of remaining the first base vector in two groupings1 A coefficient, l1< l0,；
Alternatively, mode H: in two groupings, feed back according to the priority of the second base vector and use 2LK size Bit diagram indicate the coefficient of its selection, comprising: submode H-1: in two grouping one the second optimal base vectors of each selection, L is selected in the weighting coefficient of the second optimal base vector in 1st grouping0A coefficient, the 2nd grouping in the second optimal base L is selected in the weighting coefficient of vector0A coefficient, in all weighting coefficients of remaining the second base vector in two groupings respectively again SelectionA coefficient,Value by base station configure or beWherein δMFor preset threshold；Or son side Formula H-2: in two grouping one the second optimal base vectors of each selection, the second optimal base vector in the 1st grouping plus L is selected in weight coefficient0A coefficient, the 2nd grouping in the second optimal base vector weighting coefficient in select l0A coefficient, In Each reselection l in the weighting coefficient of remaining the second base vector in two groupings1A coefficient, l1< l0。
Wherein, the mode five includes:
Mode I: the second coefficient is divided into GroupNumbe r combination, it is anti-that terminal selects l most suitable combinations to carry out Feedback usesIndicate the combination of its selection；
Alternatively, mode J: the second coefficient being divided into GroupNumbe r combination, 1 most suitable combination is selected, at it Reselection l-1 combination, uses log in remaining combination2GroupNumbe rbits indicates the most suitable combination of selection, usesIndicate remaining combination.
Wherein, before terminal feeding back precoding matrix information, this method further include:
Receive the first signaling that base station is sent；First signaling includes the first amplitude feedback penalty factor of base station configuration And the first base vector that instruction needs power to limit, for the weighting system to first base vector for needing power to limit Number power limitation；
After the weighting coefficient amplitude quantizing of first base vector for needing power to limit of the terminal feedback not It can exceed that the first amplitude feedback penalty factor of base station configuration, or adding first base vector for needing power to limit The amplitude of weight coefficient is quantified again after being multiplied by the first amplitude feedback penalty factor of base station configuration；
And/or receive the second signaling that base station is sent；Second signaling includes that the second amplitude feedback of base station configuration is punished The second base vector that penalty factor and instruction need power to limit, for second base vector for needing power to limit The limitation of weighting coefficient power；
After the weighting coefficient amplitude quantizing of second base vector for needing power to limit of the terminal feedback not It can exceed that the second amplitude feedback penalty factor of base station configuration, or adding second base vector for needing power to limit The amplitude of weight coefficient is quantified again after being multiplied by the second amplitude feedback penalty factor of base station configuration.
Wherein, the feeding back precoding matrix information, comprising:
When feedback resources are insufficient and the second base vector number K of selection is configured by terminal, dynamically reduce the of feedback Two base vector numbers；
Alternatively, if feedback resources are sufficient, being uploaded all when the second base vector number K of selection is configured by base station The parameter of base station configuration, otherwise selects one of following manner:
When a feeding back precoding matrix information in the manner described, if feedback resources are insufficient, it is based on certain criterion, The coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；
Alternatively, as two mode A for including in the manner described or mode C feeding back precoding matrix information, if feedback Inadequate resource, the weighting coefficient of optimal first base vector of terminal priority feedback, then terminal is based on certain criterion, dynamically by The coefficient that bit diagram notifies it to select is until reaching maximum feedback resource；When the mode B feedback that the mode two includes is pre- Encoder matrix information and when being indicated using submode B-1 feedback subset, if feedback resources are insufficient, terminal priority feedback optimal the The weighting coefficient of one base vector, then terminal be based on certain criterion, dynamically by bit diagram notify its select coefficient until Until reaching maximum feedback resource；When two mode B feeding back precoding matrix information for including in the manner described and use son side When formula B-2 feedback subset indicates, if feedback resources are insufficient, terminal only feeds back the weighting coefficient of optimal first base vector；
Alternatively, the three mode D feeding back precoding matrix information for including and ought be fed back in the manner described using submode D-1 When subset indicates, if feedback resources are insufficient, the weighting coefficient of optimal second base vector of terminal priority feedback, then terminal is based on Certain criterion, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；When according to described When the mode D feeding back precoding matrix information and use submode D-2 feedback subset that mode three includes indicate, if feedback resources Deficiency, terminal only feed back the weighting coefficient of optimal second base vector；When the three mode E for including feed back precoding in the manner described When matrix information, if feedback resources are insufficient, the weighting coefficient of optimal second base vector of terminal priority feedback, then terminal is based on Certain criterion, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；
Alternatively, when in the manner described four include mode F feeding back precoding matrix information when, if feedback resources are not Foot, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；When in the manner described four Including mode G in include submode G-1 or when submode G-2 feeding back precoding matrix information, if feedback resources are insufficient, The weighting coefficient of optimal first base vector, secondly feeds back the first basic vector optimal in second packet in priority feedback first grouping The weighting coefficient of amount is then based on certain criterion, and the coefficient for notifying it to select dynamically by bit diagram is until reach maximum anti- Until presenting resource；When the submode H-1 or submode H-2 for including in the four mode H for including in the manner described feed back precoding When matrix information, if feedback resources are insufficient, priority feedback first is grouped the weighting coefficient of interior optimal second base vector, secondly anti- The weighting coefficient of the second base vector optimal in second packet is presented, certain criterion is then based on, is notified dynamically by bit diagram The coefficient that it is selected is until reaching maximum feedback resource；
Alternatively, ought the five mode I feeding back precoding matrix information for including and use bit diagram feedback choosing in the manner described When the grouping selected, if feedback resources are insufficient, the grouping of its selection of base station is dynamically notified according to bit diagram based on certain criterion Until reaching maximum feedback resource；When in the manner described five include mode J feeding back precoding matrix information when, if Feedback resources are insufficient, the corresponding weighting coefficient of priority feedback optimal group.
Embodiment two
Fig. 2 is the flow diagram for the CSI back method that embodiment of the present invention two provides, such as Fig. 2 It is shown, this method comprises:
Step 201, base station receives the precoding matrix information of terminal feedback, and the precoding matrix information includes the first base Vector Message, the second base vector information, the amplitude and phase information of the second coefficient；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector, the first base vector line are fed back Property merge used in weighting coefficient be the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same Vector composed by first coefficient of one first base vector is the linear combining of the second base vector, second coefficient Weighting coefficient used in linear combining is carried out for second base vector.
Wherein, before the precoding matrix information that base station receives terminal feedback, this method further include:
The base station configuration needs to feed back the frequency domain of CSI and is sent to terminal, so that the terminal is according to the CSI Frequency domain determine and need to feed back the precoding subband of precoding information.
Wherein, the frequency domain of the CSI of the configuration includes: to need to feed back the precoding subband of CSI or need pectination The precoding subband of feedback CSI and sparse degree, or do not need the precoding subband of feedback CSI.
Wherein, before the precoding matrix information that base station receives terminal feedback, this method further include:
The base station configures the feedback system and feedback subset instruction of the second coefficient, and is sent to terminal, so as to terminal root According to the second coefficient of feedback system and feedback subset indication feedback of second coefficient；
The feedback system of second coefficient includes following one:
Mode one: the amplitude size according to the second coefficient is that priority feeds back the second coefficient；
Mode two: the second coefficient is fed back by priority of first base vector；
Mode three: the second coefficient is fed back by priority of second base vector；
Mode four: being divided into two groups for first base vector, arrives the first base vector of l-th, i.e. W for the 1st1The the 1st to L column vector, as first group, by L+1 to 2L the first base vectors, i.e. W1L+1 to the 2L column vector, as Second group, the second coefficient is fed back according to the priority of packets inner；
Mode five: being grouped the second coefficient, feeds back the second coefficient according to the priority of grouping；
The feedback subset instruction is used to indicate the mode that terminal feeds back the subset of second coefficient.
Wherein, before the precoding matrix information that base station receives terminal feedback, this method further include:
The first signaling and/or the second signaling are sent to terminal；
Wherein, first signaling includes that the first amplitude feedback penalty factor of base station configuration and instruction need power to limit First base vector of system is limited for the weighting coefficient power to first base vector for needing power to limit；It is described Second signaling includes the second amplitude feedback penalty factor of base station configuration and the second base vector that instruction needs power to limit, and is used It is limited in the weighting coefficient power to second base vector for needing power to limit.
Wherein,
The first amplitude feedback penalty factor isOr
Alternatively, the second amplitude feedback penalty factor isOr
The technical solution of the offer of embodiment of the present invention one, two is provided below by two specific embodiments.
Embodiment one
The embodiment of the present invention one proposes a kind of pair of airspace, the method for frequency domain channel coefficients compression carries out CSI feedback, i.e., A certain layer can be expressed as form in the precoding of all precoding subbands again,
Wherein, for the precoding vectors of this layer, all first coefficients of each precoding subband are formed into matrix W2。W2Dimension Degree is 2L × Ns, NsIndicate the number of precoding subbandS indicates the frequency domain unit of terminal feedback precoding, It can be adjusted according to the precision of feedback.S is known as precoding subband size, it can be made of 1 or multiple RB, NsClaim For precoding subband number；2L element of its each column corresponds to a subband, indicates above-mentioned 2L the first base vector lines Property superposition coefficient.CSI feedback frequency band refers to that base station configuration needs to feed back the frequency domain of CSI, it includes RB number be RBNum.The precoding subband is a frequency domain unit, it includes RB number can by base station configure or by feedback frequency RB number and used second base vector number in band determine, i.e., are comprising RB numberRBNum is The RB number that the CSI feedback frequency band includes, K are the second base vector number that the CSI feedback frequency band uses.
W1Include 2L the first base vectors, W1Dimension is Nt× 2L, form are as follows:
Wherein, b0,b1,…,bL-1By one group of orthogonal DFT (Discrete Fourier Transformation, it is discrete Fourier transformation) Kronecker product of vector or DFT vector constitutes, and dimension isNtIndicate the port number of CSI-RS.
Wherein, frequency domain condensation matrix W3=[w0 w1 … wK-1], it indicates from DFT matrix or over-sampling DFT matrix K base vector of selection, referred to as the second base vector.The dimension of DFT matrix is Ns×Ns；
Wherein, the desirable following one of the L: 2,3,4,5,6.2 the K can use following one: 1, ..., Ns, i.e. K is most The value that can be taken greatly is the number N of precoding subbands。
Wherein, the DFT matrix, column vector be,
Wherein, m=m0,m0+Of,m0+2Of,…,m0+(Ns-1)Of；(m0=1,2 ..., Of), OfFor oversample factor, mistake The value of decimation factor can be 1 or 2 or 4 or 8 etc..
Wherein,Dimension is 2L × K, is indicated W2By the compressed matrix of frequency domain, the weighting of the second base vector is indicated Coefficient, referred to as the second coefficient.In the present embodiment, in addition to mode C-4, the weighting coefficient of i-th of first base vectors is referred toK coefficient of the i-th row；The weighting coefficient of j-th of second base vectors, refers toJ column 2L coefficient.In mode C-4 In, in first grouping, the weighting coefficient of j-th of second base vectors, i.e.,Middle jth arranges, the 1st arrives L coefficient of L row；Second In a grouping, the weighting coefficient of j-th of second base vectors, i.e.,L coefficient of middle jth column, L+1 to 2L row.
On the basis of the precoding representation of above-mentioned new subband, Fig. 3 is the channel shape that the embodiment of the present invention one provides The flow diagram of state information CSI feedback method, as shown in figure 3, this method comprises:
Step 301, terminal receives the configuration information that base station is sent；
Wherein, the configuration information includes at least one of:
The frequency domain for needing to feed back CSI of base station configuration, the feedback system of the second coefficient of configuration and feedback subset refer to The the first amplitude feedback penalty factor and instruction show, configured needs the first base vector of power limitation, the second amplitude of configuration The information such as the second base vector that feedback penalty factor and instruction need power to limit.
Wherein, the frequency domain of the CSI includes: to need to feed back the precoding subband of CSI or need comb feedback CSI Precoding subband and sparse degree, or do not need feedback CSI precoding subband.
Step 302, terminal obtains precoding matrix information according to the result of channel estimation and the configuration information of base station；
Step 303, terminal feeding back precoding matrix information, the precoding matrix information include the first base vector information, Second base vector information, the amplitude and phase information of the second coefficient.
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector, the first base vector line are fed back Property merge used in weighting coefficient be the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same Vector composed by first coefficient of one first base vector is the linear combining of the second base vector, second coefficient Weighting coefficient used in linear combining is carried out for second base vector.
Wherein, second base vector indicates the K DFT basic vector selected from DFT matrix or over-sampling DFT matrix Amount, the oversample factor O of the over-sampling DFT matrixfValue be one of the following: 1,2,4,8.
Wherein, second base vector is DFT base vector, and second base vector can carry out part according to actual needs Amendment, for example, the second base vector, i.e. W3The selection of middle base vector needs to consider some special situations, more specifically, include with Under several special circumstances and solution:
Mode A-1: base station is possible to not need the CSI that terminal uploads all precoding subbands, and base station configuration needs to upload The precoding subband of CSI may be discontinuous, it is therefore desirable to make amendment to DFT base vector.Specifically, following several sons are done Mode improves:
Submode A-1-1: base station needs to upload the precoding subband of CSI using pectination configuration, i.e. S is specified in base station0+ Δ,S0+2Δ,S0+ 3 Δs ... the CSI of (the sparse degree that Δ=1,2,3,4 ... indicate configuration) a precoding subband needs anti- Feedback, DFT matrix can be modified using the following two kinds mode at this time:
Submode A-1-1-1: using the DFT matrix of over-sampling, base station configures biggish oversample factor, and increasing may be selected DFT matrix number, substantially be increase DFT base vector adjacent element phase difference, with compatible portion precoding subband missing make Increase at phase offset；
Submode A-1-1-2: interception part DFT matrix, i.e. DFT base vector only retain S0+Δ,S0+2Δ,S0+3 Δ ... a element.At this point, the different base vectors of DFT matrix are still orthogonal, but the phase difference of the adjacent element of the same base vector Become larger, can be lacked with compatible portion precoding subband and phase offset is caused to increase；
Submode A-1-2: base station may only configure a part of subband and not need to upload CSI, and a specific example is base Stand configuration SiA precoding subband is without reporting CSI.It, can be by clipping the S of DFT base vector when then carrying out frequency domain compressioni A element, to adapt to the case where precoding subband in part lacks.
Mode B-1: the DFT base vector is with first precoding subband for reference, i.e. the first of DFT base vector Element is 1.It can be located to the centre of all precoding subbands, can reduce tired by changing the precoding subband referred to Long-pending quantization error.Specifically, following phase rotation is done to original DFT base vector,
Wherein, for frequency domain compressed feedback method, another important problem is the second coefficient, i.e.,Feedback.According to Amplitude size, the first base vector, the second base vector, the grouping of the first base vector or the first base vector of second coefficient and the second base The priority of vector joint grouping,2LK element can with selected part subset or all feedback, different subsets is also Different precision can be fed back, to improve performance.In addition, the subset that base station and terminal need to arrange terminal selection is needed with what Mode notifies base station, i.e. the feedback subset instruction of the second coefficient.Specific feedback system and subset indicating mode, can choose with One of under type:
Mode C-1: the amplitude size according to the second coefficient is that priority feeds back the second coefficient；
Wherein, the biggish part of the second coefficient amplitude usually can more reflect true channel characteristics.One specific example It is that terminal is ranked up the amplitude of the second coefficient from big to small, from big to small selected part coefficient, until the part coefficient The sum of power be not less than δ with the second coefficient general power ratio, feed back this part coefficient of selection.Wherein, δ is threshold value, typical Value desirable 0.90,0.95,0.99 etc..Terminal indicates the coefficient of its selection using the bit diagram of 2LK size.
Mode C-2: coefficient is chosen from the angle of the first base vector；
Wherein, the first base vector corresponds to the wave beam in space, and usually reception signal can be concentrated in some specific waves Shu Fangxiang, therefore the priority and feedback accuracy of particular beam are improved, it is able to ascend system performance.Specifically, with described first Base vector is that priority feeds back the second coefficient, can choose one of following submode:
Submode C-2-1: terminal is based on certain criterion (such as corresponding K capacity factor of some first base vector and most Greatly), the first optimal base vector is selected, then K weighting coefficient of this first optimal base vector (corresponds toIt is a certain Row) in feed back l0A coefficient；The quantified precision of the weighting coefficient of this first base vector, such as amplitude and phase can suitably be increased Position is quantified as (3,4) bits or (4,4) bits；L is respectively selected in K weighting coefficient of remaining the first base vector1(l1< l0) a coefficient, amplitude and phase are quantified as (2,3) bits or (3,3) bits, wherein amplitude can directly quantify or according to The amplitude of optimal first base vector carries out differential quantization.Terminal indicates the coefficient of its selection, base using the bit diagram of 2LK size It stands and the subset of feedback is known that according to the bit diagram information of terminal feedback and its feeds back the first optimal base vector, further root According to the quantified precision of configuration, the overhead of the second coefficient of feedback can be calculated.
Submode C-2-2: terminal is based on certain criterion, selects the first optimal base vector, then the first optimal base L is fed back in K weighting coefficient of vector0A coefficient can suitably increase the weighting system of this first optimal base vector Several quantified precisions, such as amplitude and phase are quantified as (3,4) bits or (4,4) bits；In addition to the first optimal basic vector Reselection M-l in total in all weighting coefficients of remaining the first base vector except amount0The value of a coefficient, M can be matched by base station It sets or isWherein δMFor preset threshold；Its amplitude and phase quantified precision is (2,3) bits or (3,3) Bits, wherein amplitude can directly quantify or carry out differential quantization according to the amplitude of optimal first base vector.Terminal indicates it The second coefficient of part of feedback can be realized by one of following submode:
Submode C-2-2-1: terminal indicates the coefficient of its selection using the bit diagram of 2LK size, and base station is according to terminal The bit diagram information of feedback is known that the subset and the first optimal base vector of feedback, further according to the quantization of configuration essence Degree can calculate the overhead of the second coefficient of feedback.Note that the weighting coefficient number in the selection of non-optimal first base vector must L must be less than0, otherwise base station can not pass through the implicit position for knowing optimal first base vector of bit diagram；
Submode C-2-2-2: terminal usesIt indicates optimal first base vector of selection, then usesIndicate remaining M-l of its selection0A coefficient, base station, can further according to the quantified precision of configuration To calculate the overhead of the second coefficient of feedback；
Submode C-2-3: terminal be based on certain criterion, the power of 2L wave beam is ranked up, then it is corresponding from by force to Weak wave beam chooses l respectively0,l0- 1 ..., l0- M+1 coefficients, base station can be different according to the power of its wave beam, and configuration is different Feedback accuracy.Terminal indicates the coefficient of its selection, the bit diagram that base station is fed back according to terminal using the bit diagram of 2LK size Information is known that the subset of feedback and the ordering scenario of the first base vector, further according to the quantified precision of configuration, Ke Yiji Calculate the overhead of the second coefficient of feedback.
Mode C-3: consider from the second basic vector measuring angle；
Wherein, second base vector corresponds to a latency path of channel, if some strongest latency path is anti- It is higher to present precision, system performance can be improved.Specifically, the second coefficient is fed back by priority of second base vector, it can be with Select one of following submode:
Submode C-3-1: terminal be based on certain criterion (such as the power of the corresponding 2L coefficient of some second base vector it And maximum), the second optimal base vector is selected, 2L weighting coefficient of the second optimal base vector ((corresponds toIt is a certain Column)) in feed back l0A coefficient.The quantified precision of the weighting coefficient of this base vector, such as amplitude and phase can suitably be increased Quantified precision is (3,4) bits or (4,4) bits；In all weighting coefficients of remaining the second base vector, reselection in total Maximum (the M- l of range coefficient0) a coefficient, the value of M can configure by base station or beWherein δMIt is default Threshold value；Its amplitude and phase quantified precision be (2,3) bits perhaps (3 3) bits wherein amplitude can directly quantify or according to The amplitude of optimal second base vector carries out differential quantization.Terminal indicates the second coefficient of part of its feedback, can pass through following son One of mode is realized:
Submode C-3-1-1: terminal indicates the coefficient of its selection using the bit diagram of 2LK size, and base station is according to terminal The bit diagram information of feedback is known that the subset and the second optimal base vector of feedback, further according to the quantization of configuration essence Degree can calculate the overhead of the second coefficient of feedback.Note that the coefficient number in the selection of non-optimal second base vector must be lacked In l0, otherwise base station can not pass through the implicit position for knowing optimal second base vector of bit diagram；
Submode C-3-1-2: terminal usesIt indicates optimal second base vector of selection, then usesIndicate remaining M-l of its selection0A coefficient, base station, can further according to the quantified precision of configuration To calculate the overhead of the second coefficient of feedback.
Submode C-3-2: terminal is based on certain criterion, is ranked up to the power of K the second base vectors, then it is corresponding from L is chosen respectively into the weighting coefficient of the second weak base vector by force0,l0- 1 ..., l0- M+1 coefficients, base station can be according to it The power of second base vector is different, configures different amplitude and phase quantified precisions.Terminal is referred to using the bit diagram of 2LK size Show the coefficient of its selection, the bit diagram information that base station is fed back according to terminal is known that the subset of feedback and the row of the second base vector Sequence situation can calculate the overhead of the second coefficient of feedback further according to the quantified precision of configuration.
Mode C-4: being divided into two groups for the first base vector, arrives the first base vector of l-th, i.e. W for the 1st1The 1st arrive l-th Column vector, as first group, by L+1 to 2L the first base vectors, i.e. W1L+1 to the 2L column vector, as Two groups, according to the priority of packets inner, feed back the second coefficient；
Wherein, L the first base vectors are arrived to the 1stThe precoding of a port CSI-RS, in addition L the first base vector It is toTo NtThe precoding of a port CSI-RS.It is chosen in group according to certain rulePart subset, and improve Feedback accuracy, it will improve system performance.Specifically, it can choose at least one following submode:
Submode C-4-1: terminal is based on certain criterion (such as amplitude size sequence of the second coefficient), includes at first group The first base vector weighting coefficient (i.e.The 1st arrive L row) in selectionA coefficient,Value can by base station configure or Person isWherein δMFor preset threshold；The weighting coefficient for the first base vector for including at second group is (i.e.L+1 To 2L row) in reselectionA coefficient.Terminal using 2LK size bit diagram orIndicate its choosing The coefficient selected.
Submode C-4-2: terminal is based on certain criterion, respectively selects a first optimal basic vector in two group of first base vector Amount.The coefficient of correspondence of the two optimal first base vectors, can feed back more multielement, and increase quantified precision.Specifically, may be used To take one of following submode.
Submode C-4-2-1: terminal is based on certain criterion, respectively selects a first optimal base in two group of first base vector Vector.L is respectively fed back in the weighting coefficient of two optimal first base vectors0A coefficient, these coefficients can suitably increase quantization essence Degree, such as amplitude and phase are quantified as (3,4) bits or (4,4) bits.Remaining first base vector in each grouping All weighting coefficients in, each reselection in totalA coefficient,Value can by base station configure or beWherein δMFor preset threshold；Its amplitude and phase quantified precision is (2,3) bits or (3,3) bits, wherein Amplitude can directly quantify or carry out differential quantization according to the amplitude of two optimal first base vectors.Terminal is big using 2LK Small bit diagram indicates the coefficient of its selection, and the bit diagram information that base station is fed back according to terminal is known that the subset and two of feedback First base vector respectively optimal in a grouping can calculate the second coefficient of feedback further according to the quantified precision of configuration Overhead.Note that the coefficient number in the selection of non-optimal first base vector must be shorter than l0, otherwise base station can not pass through bit The implicit position for knowing optimal first base vector of figure.
Submode C-4-2-2: terminal is based on certain criterion, respectively selects a first optimal base in two group of first base vector Vector.L is respectively fed back in the weighting coefficient of two optimal first base vectors0A coefficient, these coefficients can suitably increase quantization essence Degree, such as amplitude and phase are quantified as (3,4) bits or (4,4) bits.Two groups respectively remaining the first base vector plus Each reselection l in weight coefficient1(l1< l0) a coefficient is (i.e.Every row select l1A coefficient), amplitude and phase quantified precision is (2,3) bits perhaps (3 3) bits wherein amplitude can directly quantify or according to the amplitudes of two optimal first base vectors into Row differential quantization.Terminal indicates the coefficient of its selection, the bit diagram that base station is fed back according to terminal using the bit diagram of 2LK size Information is known that the first base vector respectively optimal in the subset and two groupings of feedback, further according to the quantization of configuration essence Degree can calculate the overhead of the second coefficient of feedback.
Submode C-4-3: terminal is based on certain criterion, respectively selects a second optimal basic vector in two group of first base vector Amount.The coefficient of correspondence of the two the second base vectors can feed back more multielement, and increase quantified precision.Specifically, it can adopt Take one of following submode:
Submode C-4-3-1: terminal is based on certain criterion, respectively selects a second optimal base in two group of first base vector Vector.L is selected in the weighting coefficient of the second optimal base vector in 1st grouping0A coefficient, the 2nd grouping in it is optimal L is selected in the weighting coefficient of second base vector0A coefficient, these coefficients can suitably increase quantified precision, such as amplitude and phase Position is quantified as (3,4) bits or (4,4) bits.All weighting coefficients of remaining the second base vector in each grouping In, each reselection in totalA coefficient,Value can by base station configure or beWherein δMIt is pre- If threshold value；Its amplitude and phase quantified precision be (2,3) bits or (3,3) bits, wherein amplitude can directly quantify or Differential quantization is carried out according to the amplitude of two optimal second base vectors.Terminal indicates its selection using the bit diagram of 2LK size Coefficient, the bit diagram information that base station is fed back according to terminal is known that in the subset and two groupings of feedback respectively optimal the Two base vectors can calculate the overhead of the second coefficient of feedback further according to the quantified precision of configuration.Note that it is non-most The coefficient number of excellent first base vector selection must be shorter than l0, otherwise base station can not know optimal second base by the way that bit diagram is implicit The position of vector.
Submode C-4-3-2: terminal is based on certain criterion, respectively selects a second optimal base in two group of first base vector Vector.L is selected in the weighting coefficient of the second optimal base vector in 1st grouping0A coefficient, the 2nd grouping in it is optimal The second base vector weighting coefficient in select l0A coefficient, these coefficients can suitably increase quantified precision, for example, amplitude and Phase quantization is (3,4) bits or (4,4) bits.Two groups respectively in the weighting coefficient of remaining the second base vector it is each again Select l1(l1< l0) a coefficient is (i.e.Every column selection l1A coefficient), amplitude and phase quantified precision be (2,3) bits or Person (3,3) bits, wherein amplitude can directly quantify or carry out difference component according to the amplitude of two optimal second base vectors Change.Terminal indicates the coefficient of its selection using the bit diagram of 2LK size, and the bit diagram information that base station is fed back according to terminal can be with Know in the subset and two groupings of feedback respectively optimal the second base vector, it, can be with further according to the quantified precision of configuration Calculate the overhead of the second coefficient of feedback.
Mode C-5: the second coefficient will be grouped, will be fed back according to the priority of grouping；
Receive signal wave beam and it is corresponding when postpone a meeting or conference and be relatively concentrated, be embodied inThe biggish part of amplitude, It can concentrate and be distributed in the second coefficientSome position.It therefore, can be rightIt is grouped, terminal feeds back most suitable group It closes, increases quantified precision, system performance can be improved.Specifically, it can choose at least one following submode:
Mode C-5-1: it is grouped, is divided into according to the size of L and KA group It closes, wherein LsAnd KsThe Packet granularity of the first base vector and the second base vector is respectively indicated, Packet granularity can be according to the value of L and K And feedback accuracy is selected.Terminal is based on certain criterion, and l most suitable combinations is selected to be fed back.Terminal usesBit diagram orIndicate the combination of its selection, base station According to the combination that terminal selects, further according to the quantified precision of configuration, the overhead of the second coefficient of feedback can be calculated.
Mode C-5-2: it is grouped, is divided into according to the size of L and KIt is a It combines, wherein LsAnd KsThe Packet granularity of the first base vector and the second base vector is respectively indicated, Packet granularity can be according to L's and K Value and feedback accuracy are selected.Terminal is based on certain criterion, selects 1 most suitable combination, this combine in coefficient can be with Appropriate increase quantified precision, such as amplitude and phase are quantified as (3,4) bits or (4,4) bits.Terminal reselection (M-1) is a It combines, the coefficient in these combinations, amplitude and phase quantified precision can be (2,3) bits or (3,3) bits.Terminal makes WithThe optimum combination for indicating its selection, additionally needs It indicates other combinations of selection, further according to the quantified precision of configuration, the overhead of the second coefficient of feedback can be calculated.
Wherein, in practical communication system, the first base vector corresponds to the wave beam in space, since wave beam has direction Property, some beam signal strengths in the signal of a terminal are too big, it will bring interference to other users.Therefore, base station is logical Specific wave beam can be often limited, such as the band amplitude power of limitation particular beam.In addition, base station is according to TDD system Reciprocity, base station can also limit unnecessary second base vector, reduce the multi-path jamming of signal.Specifically, can take with Lower several ways:
Mode D-1: all optional first base vectors are grouped, i.e., a base station selected grouping, if terminal is anti- Pair the wave beam of feedback is located in the grouping of base station configuration, then limits subband amplitude power, i.e.,Certain rows (correspond to Wave beam) power limitation.For example, i-th of first base vectors of terminal feedback, precisely base station need first that power limits Base vector then can choose one of following two submode:
Submode D-1-1:I-th, the first amplitude feedback after the amplitude quantizing of i+L row no more than base station configuration punishes Penalty factor, the first amplitude feedback penalty factor that base station can configure areOr
Submode D-1-2:I-th, the amplitude of i+L row it is whole multiplied by the first certain amplitude feedback penalty factor after Quantified again, the first amplitude feedback penalty factor is desirableOr
Mode D-2: in a tdd system, reciprocity principle, the uplink letter that base station is estimated by the reference signal of uplink are based on Road, can be with reciprocity to down channel.Therefore, base station can substantially estimate the case propagation delays of down channel.And second basic vector What amount substantially reflected is a latency path, and base station can be by the second base vector of limiting terminal selection, and then avoids one A little non-essential time delay component bring interference.Specifically, it can be realized by one of following submode:
Submode D-2-1: all optional second base vectors are grouped, and base station passes through higher level parameters configuration selection one A grouping can pass through the following two kinds if second base vector of terminal selection is Chong Die with the grouping that base station configures Mode carries out power limit:
Submode D-2-1-1: second base vector corresponding all weighting coefficients are matched after amplitude quantizing no more than base station The the second amplitude feedback penalty factor set, the second amplitude feedback penalty factor that base station can configure areOr
Submode D-2-1-2: all weighting coefficients of second base vector, amplitude are whole anti-multiplied by the second certain amplitude Quantified again after feedback penalty factor, the second amplitude feedback penalty factor is desirableOr
It should be pointed out that aforesaid way D-1 and D-2 are not mutual exclusion, the two can be used in combination, while avoid doing Disturb and reduce the feedback of unnecessary second base vector.
Wherein, terminal estimates down channel by measurement CSI-RS, estimates to interfere using other reference signals, according to channel Condition, terminal can be indicated according to base station, feed back RI (Rank indicator, order instruction), CQI (Channel quality Indicator, channel quality instruction) and PMI (Precoding matrix indicator, precoding instruction).Due to base station The RI or base station that terminal is fed back can not be predicted while triggering multiple CSI reports, it is possible to cause the resource of uplink CSI It is insufficient.Therefore, it is necessary to when defining feedback resources deficiency, the resource of which part of priority feedback.According to realizing the second base vector Improved procedure and the second coefficient feedback system and feedback subset instruction various modes, can choose following manner it One:
Mode E-1: the second base vector number K of selection is fed back by terminal, if the CSI inadequate resource of feedback, terminal can Dynamically to reduce the second base vector number of feedback, reduce feedback overhead.
Mode E-2: the second base vector number K of selection is configured by base station, if the CSI inadequate resource of feedback, specifically It can choose one of following submode:
Submode E-2-1: feeding back CSI according to mode C-1, if feedback resources are sufficient, uploads all base station configurations Parameter.If feedback resources are insufficient, then terminal can be based on certain criterion, be dynamically by what bit diagram notified its selection Number is until reaching maximum feedback resource.
Submode E-2-2: feeding back CSI according to mode C-2, if feedback resources are sufficient, uploads all base station configurations Parameter.When specifically, according to submode C-2-1 and submode C-2-3 feedback CSI, if feedback resources are insufficient, terminal is preferentially anti- The corresponding coefficient of optimal first base vector is presented, then terminal can be based on certain criterion, notify its choosing dynamically by bit diagram The coefficient selected is until reaching maximum feedback resource；CSI is fed back according to submode C-2-2, and anti-according to submode C-2-2-1 Subset instruction is presented, if feedback resources are insufficient, the corresponding weighting coefficient of optimal first base vector of terminal priority feedback, then terminal It can be based on certain criterion, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；It presses CSI is fed back according to submode C-2-2, and is indicated according to submode C-2-2-2 feedback subset, if feedback resources are insufficient, terminal is only Feed back the weighting coefficient of optimal first base vector.
Submode E-2-3: feeding back CSI according to mode C-3, if feedback resources are sufficient, uploads all base station configurations Parameter.Specifically, CSI is fed back according to submode C-3-1, and is indicated according to submode C-3-1-1 feedback subset, if feedback Inadequate resource, the weighting coefficient of optimal second base vector of terminal priority feedback, then terminal can be based on certain criterion, dynamically The coefficient for notifying it to select by bit diagram is until reaching maximum feedback resource；CSI is fed back according to submode C-3-1, and It is indicated according to submode C-3-1-2 feedback subset, if feedback resources are insufficient, terminal only feeds back adding for optimal second base vector Weight coefficient；When feeding back CSI according to submode C-3-2, if feedback resources are insufficient, optimal second base vector of terminal priority feedback Weighting coefficient, then terminal can be based on certain criterion, and the coefficient for notifying it to select dynamically by bit diagram is until reach most Until big feedback resources.
Submode E-2-4: feeding back CSI according to mode C-4, if feedback resources are sufficient, uploads all base station configurations Parameter.
Specifically, CSI is fed back according to submode C-4-1 and indicate the coefficient of selection according to bit diagram mode, if feedback Inadequate resource, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；According to submode C-4-2-1 and submode C-4-2-2 feeds back CSI, if feedback resources are insufficient, optimal first in the grouping of terminal priority feedback first Secondly the weighting coefficient of base vector feeds back the weighting coefficient of the first base vector optimal in second packet, then terminal can be with base In certain criterion, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；According to son side Formula C-4-3-1 and submode C-4-3-2 feeds back CSI, optimal in the grouping of terminal priority feedback first if feedback resources are insufficient Secondly the weighting coefficient of second base vector feeds back the weighting coefficient of the second base vector optimal in second packet, then terminal can To be based on certain criterion, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource.
Submode E-2-5: being fed back CSI according to mode C-5-1, and fed back the grouping of selection using bit diagram, if feedback Inadequate resource, terminal can be based on certain criterion, dynamically notify the grouping of its selection of base station according to bit diagram until reaching most Until big feedback resources；CSI is fed back according to mode C-5-2, if feedback resources are sufficient, uploads the ginseng of all base station configurations Number.If feedback resources are insufficient, the corresponding weighting coefficient of terminal priority feedback optimal group.
It should be pointed out that above scheme is all suitable for each layer of the CSI that terminal is fed back.
Embodiment two
In above-described embodiment three on the basis of the precoding representation of new subband, Fig. 4 is that the embodiment of the present invention two mentions The flow diagram of the CSI back method of confession, as shown in figure 4, this method comprises:
Step 401, base station configuration needs to feed back the frequency domain of CSI and is sent to terminal；
Wherein, the frequency domain of the CSI of the configuration includes: to need to feed back the precoding subband of CSI or need pectination The precoding subband of feedback CSI and sparse degree, or do not need the precoding subband of feedback CSI.
Step 402, the base station configures the feedback system and feedback subset instruction of the second coefficient, and is sent to terminal；
Wherein, the feedback system of second coefficient includes following one:
Mode one: the amplitude size according to the second coefficient is that priority feeds back the second coefficient；
Mode two: the second coefficient is fed back by priority of first base vector
Mode three: the second coefficient is fed back by priority of second base vector；
Mode four: being divided into two groups for first base vector, arrives the first base vector of l-th, i.e. W for the 1st1The the 1st to L column vector, as first group, by L+1 to 2L the first base vectors, i.e. W1L+1 to the 2L column vector, as Second group, the second coefficient is fed back according to the priority of packets inner；
Mode five: being grouped the second coefficient, feeds back the second coefficient according to the priority of grouping.
Wherein, the feedback subset instruction is used to indicate the mode that terminal feeds back the subset of second coefficient.
Step 403, the feedback system of terminal is configured according to base station the frequency domain for needing to feed back CSI and the second coefficient and Feedback subset indication feedback precoding matrix information.
Wherein, the precoding matrix information include the first base vector information, the second base vector information, the second coefficient width Degree and phase information.
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector, the first base vector line are fed back Property merge used in weighting coefficient be the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same Vector composed by first coefficient of one first base vector is the linear combining of the second base vector, second coefficient Weighting coefficient used in linear combining is carried out for second base vector.
Wherein, the CSI feedback frequency band refers to that base station configuration needs to feed back the frequency domain of CSI.
Wherein, the precoding subband is a frequency domain unit, it includes RB number by base station configure or by CSI it is anti- The RB number and used second base vector number that feedback frequency band includes determine, i.e., are comprising RB number RBNum is the RB number for including in the CSI feedback frequency band, and K is the second base vector number that the CSI feedback frequency band uses.
Wherein, second coefficient is expressed as Dimension be 2L × K, 2L representing matrix W1In include 2L the One base vector, K representing matrix W3In include K the second base vectors.
Wherein, second base vector can carry out part amendment, including following three kinds of modes according to actual needs；
1, when base station pectination configuration need to feed back the subband of precoding when, the second base vector can by following submode it One is adjusted:
Submode one: configuring biggish oversample factor, increases selectable DFT matrix number；
Submode two: pectination intercepts the second base vector.
2, when configuration section does not need the subband of feedback precoding when base station, the second base vector Partial Elements are clipped.
3, the second base vector of configuration can do phase rotation, be reference with the most intermediate precoding subband of configuration.
Wherein, second coefficient, terminal can pass through subset of the feedback instruction selected by it with feedback fraction subset.It is selected Subset and feedback instruction, feed back the second coefficient according to one of following manner arranged with base station:
Mode one includes: to be ranked up with the amplitude size of second coefficient, from big to small selected part coefficient, until The sum of power of the part coefficient and the ratio of the second coefficient general power are not less than δ, and terminal feeds back the part coefficient, wherein δ is preset threshold；
The coefficient of its selection is indicated using the bit diagram of 2LK size.
Mode two includes: to feed back the second coefficient by priority of first base vector, and following son side specifically can be used One of formula:
Mode A: l is selected in K weighting coefficient of the first optimal base vector0A coefficient increases quantified precision.At it L is respectively selected in K weighting coefficient of remaining each first base vector1(l1< l0) a coefficient, appropriate lower quantization precision.Terminal makes The coefficient of its selection is indicated with the bit diagram of 2LK size.
Mode B: l is selected in K weighting coefficient of the first optimal base vector0A coefficient increases quantified precision.At it In all weighting coefficients of the first remaining base vector, reselection M-l in total0A coefficient is fed back, and the value of M can be matched by base station It sets or isWherein δMFor preset threshold, appropriate lower quantization precision.Terminal can be used following submode it One, feed back the subset of its selection.
Submode B-1: terminal indicates the coefficient of its selection using the bit diagram of 2LK size.
Submode B-2: terminal usesIt indicates optimal first base vector of selection, then usesIndicate remaining M-l of its selection0A coefficient.
Mode C: terminal is ranked up 2L the first base vectors, from by force to the weighting coefficient difference of the first weak base vector Choose l0,l0- 1 ..., l0- M+1 coefficients are fed back.Terminal using the bit diagram of 2LK size indicate its selection be Number.
Mode three includes: to feed back the second coefficient by priority of second base vector, and following son side specifically can be used One of formula:
Mode D: l is selected in 2L weighting coefficient of the second optimal base vector0A coefficient increases quantified precision.In In all weighting coefficients of remaining the second base vector, reselection M-l in total0A coefficient is fed back, and the value of M is configured by base station Or it isWherein δMFor preset threshold, appropriate lower quantization precision.Terminal can be used following submode it One, feed back the subset of its selection.
Submode D-1: terminal indicates the coefficient of its selection using the bit diagram of 2LK size.
Submode D-2: terminal usesIt indicates optimal second base vector of selection, then usesIndicate remaining M-l of its selection0A coefficient.
Mode E: terminal is ranked up K the second base vectors, from by force to the weighting coefficient difference of the second weak base vector Choose l0,l0- 1 ..., l0- M+1 coefficients.Terminal indicates the coefficient of its selection using the bit diagram of 2LK size.
Mode four includes: that first base vector, according to priority, is fed back the second coefficient, specifically may be used into being divided into two groups To use one of following submode:
Mode F: each to feed back in being grouped at two in all weighting coefficients of the first base vectorA coefficient,Value by Base station configures or isWherein δMFor preset threshold；Terminal by bit diagram orRefer to Show the coefficient of selection.
Mode G: it in two groupings, is fed back according to the priority of the first base vector, following son specifically can be used One of mode:
Submode G-1: in two grouping one the first optimal base vectors of each selection.Two the first optimal base vectors L is respectively selected in weighting coefficient0A coefficient increases quantified precision.All weighting systems of remaining the first base vector in being grouped at two Each reselection in numberA coefficient,Value by base station configure or beWherein δMFor preset threshold, Appropriate lower quantization precision.Terminal indicates the coefficient of its selection using the bit diagram of 2LK size；
Submode G-2: in two grouping one the first optimal base vectors of each selection.Two the first optimal base vectors L is respectively selected in weighting coefficient0A coefficient increases quantified precision.The weighting coefficient of remaining the first base vector in two groupings In each reselection l1(l1< l0) a coefficient, appropriate lower quantization precision.Terminal indicates its choosing using the bit diagram of 2LK size The coefficient selected.
Mode H: it in two groupings, is fed back according to the priority of the second base vector, following son specifically can be used One of mode:
Submode H-1: in two grouping one the second optimal base vectors of each selection.Optimal second in 1st grouping L is selected in the weighting coefficient of base vector0A coefficient, the 2nd grouping in the second optimal base vector weighting coefficient in select l0 A coefficient, increase quantified precision.Each reselection in all weighting coefficients of remaining the second base vector in two groupingsA coefficient,Value by base station configure or beWherein δMFor preset threshold, appropriate lower quantization Precision.Terminal indicates the coefficient of its selection using the bit diagram of 2LK size；
Submode H-2: in two grouping one the second optimal base vectors of each selection.Optimal the in 1st grouping L is selected in the weighting coefficient of two base vectors0A coefficient, the 2nd grouping in the second optimal base vector weighting coefficient in select Select l0A coefficient, increase quantified precision.Each reselection l in the weighting coefficient of remaining the second base vector in two groupings1(l1 < l0) a coefficient, appropriate lower quantization precision.Terminal indicates the coefficient of its selection using the bit diagram of 2LK size.
Mode five includes: to be grouped to the second coefficient, is fed back according to the priority of grouping, specifically can be used with One of lower submode:
Mode I: the second coefficient is divided into GroupNumbe r combination, it is anti-that terminal selects l most suitable combinations to carry out Feedback usesIndicate the combination of its selection；
Mode J: the second coefficient is divided into GroupNumber combination, terminal selects 1 most suitable combination, incrementss Change precision.In l-1 combination of selection, appropriate lower quantization precision in remaining combination.Terminal uses log2GroupNumbe r Bits indicates the most suitable combination of selection, usesIndicate remaining combination.
Wherein, base station can also limit the selection of first base vector, the second base vector, and then avoid interfering.Specifically It can be in the following ways:
Mode one: base station is grouped all optional first base vectors, to the first base vector limited By signaling terminal, the power of feedback is limited.It specifically, can be using one of following submode:
1, base station configuration limits certain first base vector powers, the weighting system of the first base vector of power limitation No more than the first amplitude feedback penalty factor of base station configuration after number amplitude quantizing；
2, base station configuration limits certain first base vector powers, the weighting system of the first base vector of power limitation Several amplitudes is quantified again after being multiplied by the first amplitude feedback penalty factor of base station configuration.
Mode two: base station is grouped all optional second base vectors, to the second base vector limited By signaling terminal, the power of feedback is limited.It specifically, can be using one of following submode:
1, base station configuration limits certain second base vector powers, the weighting system of the second base vector of power limitation No more than the second amplitude feedback penalty factor of base station configuration after number amplitude quantizing；
2, base station configuration limits certain second base vector powers, the weighting system of the second base vector of power limitation Several amplitudes is quantified again after being multiplied by the second amplitude feedback penalty factor of base station configuration.
Wherein, when the inadequate resource of uplink feedback CSI, terminal can abandon partial feedback content according to priority.Tool Body, can one of in the following ways:
Mode one: when feedback resources are insufficient and the second base vector number K of selection is configured by terminal, dynamically reduce anti- Second base vector number of feedback；
Mode two, if feedback resources are sufficient, uploads institute when the second base vector number K of selection is configured by base station The parameter for having base station to configure, otherwise selects one of following submode:
1, it when a feeding back precoding matrix information in the manner described, if feedback resources are insufficient, is fixed based on one Then, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；
2, as two mode A for including in the manner described or mode C feeding back precoding matrix information, if feedback resources Deficiency, the weighting coefficient of optimal first base vector of terminal priority feedback, then terminal can be based on certain criterion, dynamically by The coefficient that bit diagram notifies it to select is until reaching maximum feedback resource；When the mode B feedback that the mode two includes is pre- Encoder matrix information and when being indicated using submode B-1 feedback subset, if feedback resources are insufficient, terminal priority feedback optimal the The weighting coefficient of one base vector, then terminal can be based on certain criterion, the coefficient for notifying it to select dynamically by bit diagram Until reaching maximum feedback resource；When the two mode B feeding back precoding matrix information for including and use in the manner described When submode B-2 feedback subset indicates, if feedback resources are insufficient, terminal only feeds back the weighting coefficient of optimal first base vector；
3, son is fed back when three mode D feeding back precoding matrix information for including in the manner described and using submode D-1 When collection instruction, if feedback resources are insufficient, the weighting coefficient of optimal second base vector of terminal priority feedback, then terminal can be with base In certain criterion, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；When according to institute When stating the mode D feeding back precoding matrix information that mode three includes and being indicated using submode D-2 feedback subset, if feedback money Source is insufficient, and terminal only feeds back the weighting coefficient of optimal second base vector；When the three mode E feedbacks for including prelist in the manner described When code matrix information, if feedback resources are insufficient, the weighting coefficient of optimal second base vector of terminal priority feedback, then terminal can To be based on certain criterion, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；
4, when in the manner described four include mode F feeding back precoding matrix information when, if feedback resources are insufficient, move The coefficient for notifying it to select by bit diagram to state is until reaching maximum feedback resource；When four include in the manner described It is preferential anti-if feedback resources are insufficient when the submode G-1 or submode G-2 feeding back precoding matrix information that include in mode G Feedback first is grouped the weighting coefficient of interior optimal first base vector, secondly feeds back the weighting of the first base vector optimal in second packet Coefficient, is then based on certain criterion, the coefficient for notifying it select dynamically by bit diagram until arrival maximum feedback resource for Only；As the submode H-1 or submode H-2 feeding back precoding matrix information for including in the four mode H for including in the manner described When, if feedback resources are insufficient, priority feedback first is grouped the weighting coefficient of interior optimal second base vector, secondly second point of feedback The weighting coefficient of the second optimal base vector in group, is then based on certain criterion, notifies what it was selected dynamically by bit diagram Coefficient is until reaching maximum feedback resource；
5, when five mode I feeding back precoding matrix information for including in the manner described and selection is fed back using bit diagram When grouping, if feedback resources are insufficient, based on certain criterion dynamically according to bit diagram notify base station its selection grouping until Until reaching maximum feedback resource；When in the manner described five include mode J feeding back precoding matrix information when, if feedback Inadequate resource, the corresponding weighting coefficient of priority feedback optimal group.
The technical solution that the embodiment of the present invention one, two provides, the precoding matrix information of terminal feedback include the first basic vector Measure information, the second base vector information, the amplitude and phase information of the second coefficient；Wherein, first in a precoding subband The weighting coefficient of base vector is the first coefficient, using the correlation of different precoding subband precoding vectors, all numerals that prelist The matrix that first coefficient of band is constituted can be compressed on frequency domain using the second base vector, the weighting coefficient of the second base vector For the second coefficient.In this way, CSI feedback expense can either be reduced, higher CSI feedback performance is in turn ensured.
The configuration of above-mentioned base station operates and there is no fixed tandem, and the information of configuration can also merge to be sent together To terminal.
Embodiment three
Fig. 5 is the structural schematic diagram for the terminal that embodiment of the present invention three provides, as shown in figure 5, the terminal includes:
Feedback unit, be used for feeding back precoding matrix information, the precoding matrix information include the first base vector information, Second base vector information, the amplitude and phase information of the second coefficient；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector, the first base vector line are fed back Property merge used in weighting coefficient be the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same Vector composed by first coefficient of one first base vector is the linear combining of the second base vector, second coefficient Weighting coefficient used in linear combining is carried out for second base vector.
Wherein, second base vector indicates the K DFT basic vector selected from DFT matrix or over-sampling DFT matrix Amount, the oversample factor O of the over-sampling DFT matrixfValue be one of the following: 1,2,4,8.
Wherein, before feedback unit feeding back precoding matrix information, the terminal further include:
Processing unit obtains pre-coding matrix letter for the configuration information according to the result of channel estimation and base station transmission Breath；The configuration information that the base station is sent includes at least one of: the frequency domain for needing to feed back CSI of base station configuration is matched First amplitude feedback penalty factor of the instruction of feedback system and feedback subset, the configuration of the second coefficient set and instruction need to do work The second base vector that first base vector of rate limitation, the second amplitude feedback penalty factor of configuration and instruction need power to limit Etc. information.Detailed process is as follows:
Wherein, the terminal further include:
Receiving unit, for before terminal feeding back precoding matrix information, what reception base station was sent to need to feed back CSI's Frequency domain, the frequency domain of the CSI include: to need to feed back the precoding subband of CSI or need that comb feedback CSI's is pre- Subband and sparse degree are encoded, or does not need the precoding subband of feedback CSI；
Processing unit, for being repaired one of in the following manner when pectination configuration in base station needs to feed back the subband of precoding Positive second base vector:
Mode one: base station configures biggish oversample factor, increases selectable DFT matrix number；
Mode two: the precoding subband for the precoding information that terminal is fed back as needed, pectination intercept DFT base vector；
Alternatively, clipping and not needed described in DFT base vector when base station configuration section does not need the subband of feedback precoding Feed back the corresponding position element of the precoding subband of precoding information；
Alternatively, whether base station configuration by second base vector does phase rotation, with the most intermediate numeral that prelists of configuration Band is reference.
Wherein, the CSI feedback frequency band refers to that base station configuration needs to feed back the frequency domain of CSI.
Wherein, the precoding subband is a frequency domain unit, it includes RB number by base station configure or by CSI it is anti- The RB number and used second base vector number that feedback frequency band includes determine, i.e., are comprising RB number RBNum is the RB number for including in the CSI feedback frequency band, and K is the second base vector number that the CSI feedback frequency band uses.
Wherein, second coefficient is expressed as Dimension be 2L × K, 2L representing matrix W1In include 2L the One base vector, K representing matrix W3In include K the second base vectors.
Wherein, the receiving unit is also used to before terminal feeding back precoding matrix information, receives base station is sent the The feedback system and feedback subset of two coefficients indicate；
The processing unit is also used to second coefficient of one of in the following manner selection feedback:
Mode one: the amplitude size according to the second coefficient is that priority feeds back the second coefficient；
Mode two: the second coefficient is fed back by priority of first base vector
Mode three: the second coefficient is fed back by priority of second base vector；
Mode four: being divided into two groups for first base vector, arrives the first base vector of l-th, i.e. W for the 1st1The the 1st to L A column vector, as first group, by L+1 to 2L the first base vectors, i.e. W1L+1 to the 2L column vector, as Second group, the second coefficient is fed back according to the priority of packets inner；
Mode five: being grouped the second coefficient, feeds back the second coefficient according to the priority of grouping.
Wherein, the mode one includes:
It is ranked up with the amplitude size of the second coefficient, from big to small selected part coefficient, until the part coefficient The sum of power and the ratio of the second coefficient general power are not less than δ, and terminal feeds back the part coefficient, and wherein δ is preset threshold；
The coefficient of its selection is indicated using the bit diagram of 2LK size.
Wherein, the mode two includes:
Mode A: l is selected in K weighting coefficient of the first optimal base vector0A coefficient, in remaining each first base L is respectively selected in K weighting coefficient of vector1A coefficient, l1< l0, it is using what the bit diagram of 2LK size indicated its selection Number；
Alternatively, mode B: selecting l in K weighting coefficient of the first optimal base vector0A coefficient, remaining first In all weighting coefficients of base vector, reselection M-l in total0A coefficient is fed back, and the value of M is configured by base station or isWherein δMFor preset threshold；It uses the subset of its selection of one of following submode feedback: submode B-1: using The bit diagram of 2LK size indicates the coefficient of its selection；Submode B-2: it usesIndicate optimal the of selection One base vector, then useIndicate remaining M-l of its selection0A coefficient；
Alternatively, mode C: being ranked up to 2L the first base vectors, from by force into the weighting coefficient of the first weak base vector L is chosen respectively0,l0- 1 ..., l0- M+1 coefficients are fed back, and are using what the bit diagram of 2LK size indicated its selection Number.
Wherein, the mode three includes:
Mode D selects l in 2L weighting coefficient of the second optimal base vector0A coefficient, in remaining the second basic vector In all weighting coefficients of amount, reselection M-l in total0The value of a coefficient, M is configured by base station or isWherein δMFor preset threshold；It uses the subset of its selection of one of following submode feedback: submode D-1: using the bit of 2LK size The coefficient of its selection of figure instruction；Submode D-2: it usesIt indicates optimal second base vector of selection, then usesIndicate remaining M-l of its selection0A coefficient；
Alternatively, mode E: being ranked up to K the second base vectors, from by force to the weighting coefficient difference of the second weak base vector Choose l0,l0- 1 ..., l0- M+1 coefficients, the coefficient of its selection is indicated using the bit diagram of 2LK size.
Wherein, the mode four includes:
Mode F: mode F: each to feed back in being grouped at two in all weighting coefficients of the first base vectorA coefficient, Value by base station configure or beWherein δMFor preset threshold；By bit diagram or Indicate the coefficient of selection；
Alternatively, mode G: in two groupings, feed back according to the priority of the first base vector and use 2LK size Bit diagram indicate the coefficient of its selection, comprising: submode G-1: in two grouping one the first optimal base vectors of each selection, L is respectively selected in the weighting coefficient of two the first optimal base vectors0A coefficient, remaining the first base vector in two groupings Each reselection in all weighting coefficientsA coefficient,Value by base station configure or beWherein δMFor Preset threshold；Or submode G-2: in two grouping one the first optimal base vectors of each selection, two the first optimal bases L is respectively selected in the weighting coefficient of vector0A coefficient respectively selects again in the weighting coefficient of remaining the first base vector in two groupings Select l1A coefficient, l1< l0,；
Alternatively, mode H: in two groupings, feed back according to the priority of the second base vector and use 2LK size Bit diagram indicate the coefficient of its selection, comprising: submode H-1: in two grouping one the second optimal base vectors of each selection, L is selected in the weighting coefficient of the second optimal base vector in 1st grouping0A coefficient, the 2nd grouping in the second optimal base L is selected in the weighting coefficient of vector0A coefficient, in all weighting coefficients of remaining the second base vector in two groupings respectively again SelectionA coefficient,Value by base station configure or beWherein δMFor preset threshold；Or son side Formula H-2: in two grouping one the second optimal base vectors of each selection, the second optimal base vector in the 1st grouping plus L is selected in weight coefficient0A coefficient, the 2nd grouping in the second optimal base vector weighting coefficient in select l0A coefficient, In Each reselection l in the weighting coefficient of remaining the second base vector in two groupings1A coefficient, l1< l0。
Wherein, the mode five includes:
Mode I: the second coefficient is divided into GroupNumbe r combination, it is anti-that terminal selects l most suitable combinations to carry out Feedback usesIndicate the combination of its selection；
Alternatively, mode J: the second coefficient being divided into GroupNumbe r combination, 1 most suitable combination is selected, at it Reselection l-1 combination, uses log in remaining combination2GroupNumbe rbits indicates the most suitable combination of selection, usesIndicate remaining combination.
Wherein, the receiving unit is also used to before terminal feeding back precoding matrix information, receives base station is sent the One signaling；First signaling includes the first amplitude feedback penalty factor of base station configuration and instruction needs that power limits the One base vector is limited for the weighting coefficient power to first base vector for needing power to limit；
The processing unit is also used to the weighting coefficient of first base vector for needing power to limit of limit feedback The the first amplitude feedback penalty factor configured after amplitude quantizing no more than base station, or need power to limit for described The amplitude of the weighting coefficient of first base vector is quantified again after being multiplied by the first amplitude feedback penalty factor of base station configuration；
And/or the receiving unit, it is also used to before terminal feeding back precoding matrix information, receives what base station was sent Second signaling；Second signaling includes that the second amplitude feedback penalty factor of base station configuration and instruction need power to limit Second base vector is limited for the weighting coefficient power to second base vector for needing power to limit；
The processing unit is also used to the weighting coefficient of second base vector for needing power to limit of limit feedback The the second amplitude feedback penalty factor configured after amplitude quantizing no more than base station, or need power to limit for described The amplitude of the weighting coefficient of second base vector is quantified again after being multiplied by the second amplitude feedback penalty factor of base station configuration.
Wherein, the processing unit, is also used to
When feedback resources are insufficient and the second base vector number K of selection is configured by terminal, dynamically reduce the of feedback Two base vector numbers；
Alternatively, if feedback resources are sufficient, being uploaded all when the second base vector number K of selection is configured by base station The parameter of base station configuration, otherwise selects one of following manner:
When a feeding back precoding matrix information in the manner described, if feedback resources are insufficient, it is based on certain criterion, The coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；
Alternatively, as two mode A for including in the manner described or mode C feeding back precoding matrix information, if feedback Inadequate resource, the weighting coefficient of optimal first base vector of terminal priority feedback, then terminal is based on certain criterion, dynamically by The coefficient that bit diagram notifies it to select is until reaching maximum feedback resource；When the mode B feedback that the mode two includes is pre- Encoder matrix information and when being indicated using submode B-1 feedback subset, if feedback resources are insufficient, terminal priority feedback optimal the The weighting coefficient of one base vector, then terminal be based on certain criterion, dynamically by bit diagram notify its select coefficient until Until reaching maximum feedback resource；When two mode B feeding back precoding matrix information for including in the manner described and use son side When formula B-2 feedback subset indicates, if feedback resources are insufficient, terminal only feeds back the weighting coefficient of optimal first base vector；
Alternatively, the three mode D feeding back precoding matrix information for including and ought be fed back in the manner described using submode D-1 When subset indicates, if feedback resources are insufficient, the weighting coefficient of optimal second base vector of terminal priority feedback, then terminal is based on Certain criterion, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；When according to described When the mode D feeding back precoding matrix information and use submode D-2 feedback subset that mode three includes indicate, if feedback resources Deficiency, terminal only feed back the weighting coefficient of optimal second base vector；When the three mode E for including feed back precoding in the manner described When matrix information, if feedback resources are insufficient, the weighting coefficient of optimal second base vector of terminal priority feedback, then terminal is based on Certain criterion, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；
Alternatively, when in the manner described four include mode F feeding back precoding matrix information when, if feedback resources are not Foot, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；When in the manner described four Including mode G in include submode G-1 or when submode G-2 feeding back precoding matrix information, if feedback resources are insufficient, The weighting coefficient of optimal first base vector, secondly feeds back the first basic vector optimal in second packet in priority feedback first grouping The weighting coefficient of amount is then based on certain criterion, and the coefficient for notifying it to select dynamically by bit diagram is until reach maximum anti- Until presenting resource；When the submode H-1 or submode H-2 for including in the four mode H for including in the manner described feed back precoding When matrix information, if feedback resources are insufficient, priority feedback first is grouped the weighting coefficient of interior optimal second base vector, secondly anti- The weighting coefficient of the second base vector optimal in second packet is presented, certain criterion is then based on, is notified dynamically by bit diagram The coefficient that it is selected is until reaching maximum feedback resource；
Alternatively, ought the five mode I feeding back precoding matrix information for including and use bit diagram feedback choosing in the manner described When the grouping selected, if feedback resources are insufficient, the grouping of its selection of base station is dynamically notified according to bit diagram based on certain criterion Until reaching maximum feedback resource；When in the manner described five include mode J feeding back precoding matrix information when, if Feedback resources are insufficient, the corresponding weighting coefficient of priority feedback optimal group.
Embodiment four
Fig. 6 is the structural schematic diagram for the base station that embodiment of the present invention four provides, as shown in fig. 6, the base station includes:
Receiving unit, for receiving the precoding matrix information of terminal feedback, the precoding matrix information includes first Base vector information, the second base vector information, the amplitude and phase information of the second coefficient；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector, the first base vector line are fed back Property merge used in weighting coefficient be the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same Vector composed by first coefficient of one first base vector is the linear combining of the second base vector, second coefficient Weighting coefficient used in linear combining is carried out for second base vector.
Wherein, the base station further include:
Configuration unit, for before the precoding matrix information that base station receives terminal feedback, configuration to need to feed back CSI's Frequency domain；
Transmission unit, for by configuration the frequency domain for needing to feed back CSI be sent to terminal, so as to the terminal according to The frequency domain of the CSI determines the precoding subband for needing to feed back precoding information.
Wherein, the frequency domain of the CSI of the configuration includes: to need to feed back the precoding subband of CSI or need pectination The precoding subband of feedback CSI and sparse degree, or do not need the precoding subband of feedback CSI.
Wherein,
Configuration unit is also used to before the precoding matrix information that base station receives terminal feedback, the second coefficient of configuration Feedback system and feedback subset instruction；
The transmission unit is also used to the feedback system of the second coefficient of configuration and feedback subset instruction being sent to end End, so that terminal is according to the second coefficient of feedback system and feedback subset indication feedback of second coefficient；
The feedback system of second coefficient includes following one:
Mode one: the second coefficient is fed back according to the amplitude size of the second coefficient；
Mode two: the second coefficient is fed back by priority of first base vector
Mode three: the second coefficient is fed back by priority of second base vector；
Mode four: being divided into two groups for first base vector, arrives the first base vector of l-th, i.e. W for the 1st1The the 1st to L column vector, as first group, by L+1 to 2L the first base vectors, i.e. W1L+1 to the 2L column vector, as Second group, the second coefficient is fed back according to the priority of packets inner；
Mode five: being grouped the second coefficient, feeds back the second coefficient according to the priority of grouping；
The feedback subset instruction is used to indicate the mode that terminal feeds back the subset of second coefficient.
Wherein, wherein second coefficient is expressed as Dimension be 2L × K, 2L representing matrix W1In include 2L the first base vectors, K representing matrix W3In include K the second base vectors.
Wherein, the mode one includes:
It is ranked up with the amplitude size of the second coefficient, from big to small selected part capacity factor, until the part system The sum of several power and the ratio of the second coefficient general power are not less than δ, and terminal feeds back the part coefficient, and wherein δ is default threshold Value；
The coefficient of its selection is indicated using the bit diagram of 2LK size.
Wherein, the mode two includes:
Mode A: l is selected in the optimal corresponding K coefficient of the first base vector0A coefficient, in remaining each first base L is respectively selected in the corresponding K coefficient of vector1A coefficient, l1< l0, it is using what the bit diagram of 2LK size indicated its selection Number；
Alternatively, mode B: selecting l in the optimal corresponding K coefficient of the first base vector0A coefficient, remaining first In the corresponding all coefficients of base vector, reselection M-l in total0A coefficient is fed back, and the value of M is configured by base station or isWherein δMFor preset threshold；It uses the subset of its selection of one of following submode feedback: submode B-1: using The bit diagram of 2LK size indicates the coefficient of its selection；Submode B-2: it usesIndicate optimal the of selection One base vector, then useIndicate remaining M-l of its selection0A coefficient；
Alternatively, mode C: being ranked up to 2L the first base vectors, from by force into the weak corresponding coefficient of the first base vector L is chosen respectively0,l0- 1 ..., l0- M+1 coefficients are fed back, and are using what the bit diagram of 2LK size indicated its selection Number.
Wherein, the mode three includes:
Mode D selects l in the optimal corresponding 2L coefficient of the second base vector0A coefficient, in remaining the second basic vector It measures in corresponding all coefficients, in total reselection M-l0The value of a coefficient, M is configured by base station or isWherein δM For preset threshold；It uses the subset of its selection of one of following submode feedback: submode D-1: using the bit diagram of 2LK size Indicate the coefficient of its selection；Submode D-2: it usesIt indicates optimal second base vector of selection, then usesIndicate remaining M-l of its selection0A coefficient；
Alternatively, mode E: being ranked up to K the second base vectors, from by force to the weak corresponding coefficient difference of the second base vector Choose l0,l0- 1 ..., l0- M+1 coefficients, the coefficient of its selection is indicated using the bit diagram of 2LK size.
Wherein, the mode four includes:
Mode F: each to feed back in two groupingsA coefficient,Value by base station configure or be Wherein δMFor preset threshold；By bit diagram orIndicate the coefficient of selection；
Alternatively, mode G: in two groupings, feed back according to the priority of the first base vector and use 2LK size Bit diagram indicate the coefficient of its selection, comprising: submode G-1: in two grouping one the first optimal base vectors of each selection, L is respectively selected in the coefficient of correspondence of two the first optimal base vectors0A coefficient, remaining first base vector pair in two groupings It should each reselection in all coefficientsA coefficient,Value by base station configure or beWherein δMIt is pre- If threshold value；Or submode G-2: in two grouping one the first optimal base vectors of each selection, two the first optimal basic vectors L is respectively selected in the coefficient of correspondence of amount0A coefficient, each reselection l in remaining first base vector coefficient of correspondence in two groupings1 A coefficient, l1< l0,；
Alternatively, mode H: in two groupings, feed back according to the priority of the second base vector and use 2LK size Bit diagram indicate the coefficient of its selection, comprising: submode H-1: in two grouping one the second optimal base vectors of each selection, L is selected in the corresponding coefficient of the second optimal base vector in 1st grouping0A coefficient, the 2nd grouping in optimal second L is selected in the coefficient of correspondence of base vector0A coefficient, remaining second base vector in two groupings correspond in all coefficients respectively again SelectionA coefficient,Value by base station configure or beWherein δMFor preset threshold；Or son side Formula H-2: pair of the second optimal base vector in two grouping one the second optimal base vectors of each selection, the 1st grouping It answers and selects l in coefficient0A coefficient, the 2nd grouping in the second optimal base vector coefficient of correspondence in select l0A coefficient, In Each reselection l in remaining second base vector coefficient of correspondence in two groupings1A coefficient, l1< l0。
Wherein, the mode five includes:
Mode I: the second coefficient is divided into GroupNumbe r combination, it is anti-that terminal selects l most suitable combinations to carry out Feedback usesIndicate the combination of its selection；
Alternatively, mode J: the second coefficient being divided into GroupNumbe r combination, 1 most suitable combination is selected, at it Reselection l-1 combination, uses log in remaining combination2GroupNumbe r bits indicates the most suitable combination of selection, usesIndicate remaining combination.
Wherein,
The configuration unit, is also used to configure the first amplitude feedback penalty factor and instruction needs the first of power limitation Base vector；
The transmission unit is also used to before the precoding matrix information that base station receives terminal feedback, is sent to terminal First signaling；
Wherein, first signaling includes that the first amplitude feedback penalty factor of base station configuration and instruction need power to limit First base vector of system is limited for the power to the first base vector coefficient of correspondence for needing power to limit；
And/or the configuration unit, it is also used to configure the second amplitude feedback penalty factor and instruction needs power to limit The second base vector；
The transmission unit is also used to before the precoding matrix information that base station receives terminal feedback, is sent to terminal Second signaling；
Wherein, second signaling includes that the second amplitude feedback penalty factor of base station configuration and instruction need power to limit Second base vector of system is limited for the power to the second base vector coefficient of correspondence for needing power to limit.
Wherein, the first amplitude feedback penalty factor isOr
Alternatively, the second amplitude feedback penalty factor isOr
The embodiment of the invention also provides a kind of terminal, including memory, processor and it is stored on the memory simultaneously The computer program that can be run on the processor, the computer program are realized any of the above-described when being executed by the processor The method for the CSI back that item terminal executes.
The embodiment of the invention also provides a kind of base station, including memory, processor and it is stored on the memory simultaneously The computer program that can be run on the processor, the computer program are realized any of the above-described when being executed by the processor The method for the CSI back that item base station executes.
The embodiment of the invention also provides a kind of computer readable storage medium, deposited on the computer readable storage medium Message handling program is contained, channel state information described in any of the above-described is realized when the message handling program is executed by processor The method of CSI feedback.
It will appreciated by the skilled person that whole or certain steps, system, dress in method disclosed hereinabove Functional module/unit in setting may be implemented as software, firmware, hardware and its combination appropriate.In hardware embodiment, Division between the functional module/unit referred in the above description not necessarily corresponds to the division of physical assemblies；For example, one Physical assemblies can have multiple functions or a function or step and can be executed by several physical assemblies cooperations.Certain groups Part or all components may be implemented as by processor, such as the software that digital signal processor or microprocessor execute, or by It is embodied as hardware, or is implemented as integrated circuit, such as specific integrated circuit.Such software can be distributed in computer-readable On medium, computer-readable medium may include computer storage medium (or non-transitory medium) and communication media (or temporarily Property medium).As known to a person of ordinary skill in the art, term computer storage medium is included in for storing information (such as Computer readable instructions, data structure, program module or other data) any method or technique in the volatibility implemented and non- Volatibility, removable and nonremovable medium.Computer storage medium include but is not limited to RAM, ROM, EEPROM, flash memory or its His memory technology, CD-ROM, digital versatile disc (DVD) or other optical disc storages, magnetic holder, tape, disk storage or other Magnetic memory apparatus or any other medium that can be used for storing desired information and can be accessed by a computer.This Outside, known to a person of ordinary skill in the art to be, communication media generally comprises computer readable instructions, data structure, program mould Other data in the modulated data signal of block or such as carrier wave or other transmission mechanisms etc, and may include any information Delivery media.
Although disclosed herein embodiment it is as above, the content only for ease of understanding the present invention and use Embodiment is not intended to limit the invention.Technical staff in any fields of the present invention is taken off not departing from the present invention Under the premise of the spirit and scope of dew, any modification and variation, but the present invention can be carried out in the form and details of implementation Scope of patent protection, still should be subject to the scope of the claims as defined in the appended claims.

Claims (25)

1. a kind of CSI back method, comprising:
Terminal feeding back precoding matrix information, the precoding matrix information include the first base vector information, the second base vector letter The amplitude and phase information of breath, the second coefficient；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector is fed back, the first base vector is linearly closed And used weighting coefficient is the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same institute The linear combining that vector composed by first coefficient of the first base vector is the second base vector is stated, second coefficient is institute It states the second base vector and carries out weighting coefficient used in linear combining.
2. the method according to claim 1, wherein second base vector indicates to adopt from DFT matrix or excessively The K DFT base vector selected in sample DFT matrix, the oversample factor O of the over-sampling DFT matrixfValue be it is following it One: 1,2,4,8.
3. according to the method described in claim 2, it is characterized in that, before terminal feeding back precoding matrix information, this method Further include:
The frequency domain for needing to feed back CSI that base station is sent is received, the frequency domain of the CSI includes: need to feed back CSI pre- Coding subband perhaps need comb feedback CSI precoding subband and sparse degree or do not need feedback CSI the numeral that prelists Band；
When pectination configuration in base station needs to feed back the precoding subband of precoding information, one of in the following manner the second base of amendment Vector:
Mode one: when base station configures biggish oversample factor, increase selectable DFT matrix number；
Mode two: the precoding subband for the precoding information that terminal is fed back as needed, pectination intercept DFT base vector；
Alternatively, clipping when base station configuration section does not need the subband of feedback precoding and not needing to feed back described in DFT base vector The corresponding position element of the precoding subband of precoding information；
Alternatively, whether base station configuration by second base vector does phase rotation, it is with the most intermediate precoding subband of configuration With reference to.
4. the method according to claim 1, wherein the CSI feedback frequency band refers to that base station configuration needs to feed back The frequency domain of CSI.
5. the method according to claim 1, wherein the precoding subband is a frequency domain unit, it includes RB number configured by base station or the RB number for including by CSI feedback frequency band and used second base vector number determine, It is comprising RB numberRBNum is the RB number for including in the CSI feedback frequency band, and K is that the CSI is anti- The second base vector number that feedback frequency band uses.
6. the method according to claim 1, wherein second coefficient be expressed as W~2,Dimension be 2L × K, 2L representing matrix W1In include 2L the first base vectors, K representing matrix W3In include K the second base vectors.
7. according to the method described in claim 6, it is characterized in that, before terminal feeding back precoding matrix information, this method Further include:
Receive the feedback system and feedback subset instruction of the second coefficient that base station is sent；
The second coefficient in the precoding matrix information is fed back one of in the following manner:
Mode one: the amplitude size according to the second coefficient is that priority feeds back the second coefficient；
Mode two: the second coefficient is fed back by priority of first base vector；
Mode three: the second coefficient is fed back by priority of second base vector；
Mode four: being divided into two groups for first base vector, arrives the first base vector of l-th, i.e. W for the 1st1The 1st to l-th arrange Vector, as first group, by L+1 to 2L the first base vectors, i.e. W1L+1 to the 2L column vector, as second Group feeds back the second coefficient according to the priority of packets inner；
Mode five: being grouped the second coefficient, feeds back the second coefficient according to the priority of grouping.
8. the method according to the description of claim 7 is characterized in that the mode one includes:
It is ranked up with the amplitude size of the second coefficient, from big to small selected part coefficient, until the power of the part coefficient The sum of be not less than δ with the ratio of the second coefficient general power, terminal feeds back the part coefficient, and wherein δ is preset threshold；
The coefficient of its selection is indicated using the bit diagram of 2LK size.
9. the method according to the description of claim 7 is characterized in that the mode two includes:
Mode A: l is selected in K weighting coefficient of the first optimal base vector0A coefficient, in remaining each first base vector L is respectively selected in K weighting coefficient1A coefficient, l1< l0, the coefficient of its selection is indicated using the bit diagram of 2LK size；
Alternatively, mode B: selecting l in K weighting coefficient of the first optimal base vector0A coefficient, in remaining the first basic vector In all weighting coefficients of amount, reselection M-l in total0A coefficient is fed back, and the value of M is configured by base station or isWherein δMFor preset threshold；It uses the subset of its selection of one of following submode feedback: submode B-1: using The bit diagram of 2LK size indicates the coefficient of its selection；Submode B-2: it usesIndicate optimal the of selection One base vector, then useIndicate remaining M-l of its selection0A coefficient；
Alternatively, mode C: 2L the first base vectors are ranked up, from by force into the weighting coefficient of the first weak base vector respectively Choose l0,l0- 1 ..., l0- M+1 coefficients are fed back, and the coefficient of its selection is indicated using the bit diagram of 2LK size.
10. the method according to the description of claim 7 is characterized in that the mode three includes:
Mode D selects l in 2L weighting coefficient of the second optimal base vector0A coefficient, in remaining the second base vector In all weighting coefficients, reselection M-l in total0The value of a coefficient, M is configured by base station or isWherein δMIt is pre- If threshold value；It uses the subset of its selection of one of following submode feedback: submode D-1: being indicated using the bit diagram of 2LK size Its coefficient selected；Submode D-2: it usesIt indicates optimal second base vector of selection, then usesIndicate remaining M-l of its selection0A coefficient；
Alternatively, mode E: being ranked up to K the second base vectors, from being chosen respectively to the weighting coefficient of the second weak base vector by force l0,l0- 1 ..., l0- M+1 coefficients, the coefficient of its selection is indicated using the bit diagram of 2LK size.
11. the method according to the description of claim 7 is characterized in that the mode four includes:
Mode F: each to feed back in being grouped at two in all weighting coefficients of the first base vectorA coefficient,Value by base station It configures or isWherein δMFor preset threshold；By bit diagram orIndicate selection Coefficient；
Alternatively, mode G: in two groupings, feed back and using the ratio of 2LK size according to the priority of the first base vector The coefficient of its selection of spy's figure instruction, comprising: submode G-1: in two grouping one the first optimal base vectors of each selection, two L is respectively selected in the weighting coefficient of the first optimal base vector0A coefficient, remaining the first base vector in two groupings it is all Each reselection in weighting coefficientA coefficient,Value by base station configure or beWherein δMIt is default Threshold value；Or submode G-2: in two grouping one the first optimal base vectors of each selection, two the first optimal base vectors Weighting coefficient in respectively select l0A coefficient, each reselection l in the weighting coefficient of remaining the first base vector in two groupings1 A coefficient, l1< l0,；
Alternatively, mode H: in two groupings, feed back and using the ratio of 2LK size according to the priority of the second base vector The coefficient of its selection of spy's figure instruction, comprising: submode H-1: in two grouping one the second optimal base vectors of each selection, the 1st L is selected in the weighting coefficient of the second optimal base vector in a grouping0A coefficient, the 2nd grouping in the second optimal basic vector L is selected in the weighting coefficient of amount0A coefficient respectively selects again in all weighting coefficients of remaining the second base vector in two groupings It selectsA coefficient,Value by base station configure or beWherein δMFor preset threshold；Or submode H-2: the weighting of the second optimal base vector in two grouping one the second optimal base vectors of each selection, the 1st grouping L is selected in coefficient0A coefficient, the 2nd grouping in the second optimal base vector weighting coefficient in select l0A coefficient, two Each reselection l in the weighting coefficient of remaining the second base vector in a grouping1A coefficient, l1< l0。
12. the method according to the description of claim 7 is characterized in that the mode five includes:
Mode I: the second coefficient is divided into GroupNumber combination, l most suitable combinations of terminal selection are fed back, made WithIndicate the combination of its selection；
Alternatively, mode J: the second coefficient being divided into GroupNumber combination, selects 1 most suitable combination, in remaining combination Middle reselection l-1 combination, uses log2GroupNumber bits indicates the most suitable combination of selection, usesIndicate remaining combination.
13. the method according to claim 1, wherein before terminal feeding back precoding matrix information, this method Further include:
Receive the first signaling that base station is sent；First signaling includes the first amplitude feedback penalty factor of base station configuration and refers to Show the first base vector for needing power to limit, is done for the weighting coefficient to first base vector for needing power to limit Power limit；
It cannot surpass after the weighting coefficient amplitude quantizing of first base vector for needing power to limit of the terminal feedback Cross base station configuration the first amplitude feedback penalty factor, or by it is described need power limit the first base vector weighting system Several amplitudes is quantified again after being multiplied by the first amplitude feedback penalty factor of base station configuration；
And/or receive the second signaling that base station is sent；Second signaling include base station configuration the second amplitude feedback punishment because The second base vector that son and instruction need power to limit, for the weighting to second base vector for needing power to limit The limitation of coefficient power；
It cannot surpass after the weighting coefficient amplitude quantizing of second base vector for needing power to limit of the terminal feedback Cross base station configuration the second amplitude feedback penalty factor, or by it is described need power limit the second base vector weighting system Several amplitudes is quantified again after being multiplied by the second amplitude feedback penalty factor of base station configuration.
14. according to the described in any item methods of claim 7-12, which is characterized in that the feeding back precoding matrix information, packet It includes:
When feedback resources are insufficient and the second base vector number K of selection is configured by terminal, dynamically reduce the second base of feedback Vector number；
Alternatively, if feedback resources are sufficient, uploading all base stations when the second base vector number K of selection is configured by base station Otherwise the parameter of configuration selects one of following manner:
When a feeding back precoding matrix information in the manner described, if feedback resources are insufficient, it is based on certain criterion, dynamic The coefficient that ground notifies it to select by bit diagram is until reaching maximum feedback resource；
Alternatively, as two mode A for including in the manner described or mode C feeding back precoding matrix information, if feedback resources Deficiency, the weighting coefficient of optimal first base vector of terminal priority feedback, then terminal is based on certain criterion, dynamically by bit The coefficient that figure notifies it to select is until reaching maximum feedback resource；When the mode B that the mode two includes feeds back precoding When matrix information and use submode B-1 feedback subset instruction, if feedback resources are insufficient, optimal first base of terminal priority feedback The weighting coefficient of vector, then terminal is based on certain criterion, and the coefficient for notifying it to select dynamically by bit diagram is until reach Until maximum feedback resource；When two mode B feeding back precoding matrix information for including in the manner described and use submode B-2 When feedback subset indicates, if feedback resources are insufficient, terminal only feeds back the weighting coefficient of optimal first base vector；
Alternatively, ought in the manner described the three mode D feeding back precoding matrix information for including and use submode D-1 feedback subset When instruction, if feedback resources are insufficient, the weighting coefficient of optimal second base vector of terminal priority feedback, then terminal is based on certain Criterion, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；When in the manner described When the three mode D feeding back precoding matrix information for including and use submode D-2 feedback subset instruction, if feedback resources are not Foot, terminal only feed back the weighting coefficient of optimal second base vector；When the three mode E for including feed back precoding square in the manner described When battle array information, if feedback resources are insufficient, the weighting coefficient of optimal second base vector of terminal priority feedback, then terminal is based on one It fixes then, the coefficient for notifying it to select dynamically by bit diagram is until reaching maximum feedback resource；
Alternatively, when in the manner described four include mode F feeding back precoding matrix information when, if feedback resources are insufficient, move The coefficient for notifying it to select by bit diagram to state is until reaching maximum feedback resource；When four include in the manner described It is preferential anti-if feedback resources are insufficient when the submode G-1 or submode G-2 feeding back precoding matrix information that include in mode G The weighting coefficient of optimal first base vector in first grouping is presented, adding for the first base vector optimal in second packet is secondly fed back Weight coefficient is then based on certain criterion, and the coefficient for notifying it to select dynamically by bit diagram is until reach maximum feedback resource Until；When submode H-1 or submode H-2 the feeding back precoding matrix letter for including in the four mode H for including in the manner described When breath, if feedback resources are insufficient, priority feedback first is grouped the weighting coefficient of interior optimal second base vector, secondly feedback second The weighting coefficient of the second optimal base vector in grouping, is then based on certain criterion, notifies its selection dynamically by bit diagram Coefficient until reaching maximum feedback resource；
Alternatively, the five mode I feeding back precoding matrix information for including and selection ought be fed back using bit diagram in the manner described When grouping, if feedback resources are insufficient, based on certain criterion dynamically according to bit diagram notify base station its selection grouping until Until reaching maximum feedback resource；When in the manner described five include mode J feeding back precoding matrix information when, if feedback Inadequate resource, the corresponding weighting coefficient of priority feedback optimal group.
15. a kind of CSI back method, comprising:
Base station receives the precoding matrix information of terminal feedback, and the precoding matrix information includes the first base vector information, the The amplitude and phase information of diyl Vector Message, the second coefficient；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector is fed back, the first base vector is linearly closed And used weighting coefficient is the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same institute The linear combining that vector composed by first coefficient of the first base vector is the second base vector is stated, second coefficient is institute It states the second base vector and carries out weighting coefficient used in linear combining.
16. according to the method for claim 15, which is characterized in that receive the precoding matrix information of terminal feedback in base station Before, this method further include:
The base station configuration needs to feed back the frequency domain of CSI and is sent to terminal, so that the terminal is according to the frequency of the CSI Domain range determines the precoding subband for needing to feed back precoding information.
17. according to the method for claim 16, which is characterized in that the frequency domain of the CSI of the configuration includes: to need instead Feedback CSI precoding subband perhaps need comb feedback CSI precoding subband and sparse degree or do not need feedback CSI Precoding subband.
18. according to the method for claim 15, which is characterized in that receive the precoding matrix information of terminal feedback in base station Before, this method further include:
The base station configures the feedback system and feedback subset instruction of the second coefficient, and is sent to terminal, so as to the terminal root According to the second coefficient of feedback system and feedback subset indication feedback of second coefficient；
The feedback system of second coefficient includes following one:
Mode one: the amplitude size according to the second coefficient is that priority feeds back the second coefficient；
Mode two: the second coefficient is fed back by priority of first base vector；
Mode three: the second coefficient is fed back by priority of second base vector；
Mode four: being divided into two groups for first base vector, arrives the first base vector of l-th, i.e. W for the 1st1The 1st to l-th arrange Vector, as first group, by L+1 to 2L the first base vectors, i.e. W1L+1 to the 2L column vector, as second Group feeds back the second coefficient according to the priority of packets inner；
Mode five: being grouped the second coefficient, feeds back the second coefficient according to the priority of grouping；
The feedback subset instruction is used to indicate the mode that terminal feeds back the subset of second coefficient.
19. according to the method for claim 15, which is characterized in that receive the precoding matrix information of terminal feedback in base station Before, this method further include:
The first signaling and/or the second signaling are sent to terminal；
Wherein, first signaling includes that the first amplitude feedback penalty factor of base station configuration and instruction need power to limit First base vector is limited for the weighting coefficient power to first base vector for needing power to limit；Described second Signaling include base station configuration the second amplitude feedback penalty factor and instruction need power limit the second base vector, for pair The weighting coefficient power limitation of second base vector for needing power to limit.
20. according to the method for claim 19, which is characterized in that
The first amplitude feedback penalty factor isOr
Alternatively, the second amplitude feedback penalty factor isOr
21. a kind of terminal characterized by comprising
Feedback unit, is used for feeding back precoding matrix information, and the precoding matrix information includes the first base vector information, second Base vector information, the amplitude and phase information of the second coefficient；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector is fed back, the first base vector is linearly closed And used weighting coefficient is the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same institute The linear combining that vector composed by first coefficient of the first base vector is the second base vector is stated, second coefficient is institute It states the second base vector and carries out weighting coefficient used in linear combining.
22. a kind of base station characterized by comprising
Receiving unit, for receiving the precoding matrix information of terminal feedback, the precoding matrix information includes the first basic vector Measure information, the second base vector information, the amplitude and phase information of the second coefficient；
Wherein, the linear combining that the precoding vectors in precoding subband are the first base vector is fed back, the first base vector is linearly closed And used weighting coefficient is the first coefficient；In the frequency domain unit that all CSI feedback frequency bands are included, correspond to same institute The linear combining that vector composed by first coefficient of the first base vector is the second base vector is stated, second coefficient is institute It states the second base vector and carries out weighting coefficient used in linear combining.
23. a kind of terminal, which is characterized in that including memory, processor and be stored on the memory and can be at the place The computer program run on reason device is realized when the computer program is executed by the processor as in claim 1 to 14 Any one CSI back method.
24. a kind of base station, which is characterized in that including memory, processor and be stored on the memory and can be at the place The computer program run on reason device is realized when the computer program is executed by the processor as in claim 15 to 20 Any one CSI back method.
25. a kind of computer readable storage medium, which is characterized in that be stored at information on the computer readable storage medium Program is managed, the channel status as described in any one of claims 1 to 20 is realized when the message handling program is executed by processor Information CSI feedback method.
CN201811625788.XA 2018-12-28 2018-12-28 Channel State Information (CSI) feedback method and equipment Active CN110535498B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201811625788.XA CN110535498B (en) 2018-12-28 2018-12-28 Channel State Information (CSI) feedback method and equipment
PCT/CN2019/128653 WO2020135573A1 (en) 2018-12-28 2019-12-26 Channel state information feedback method, apparatus, and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811625788.XA CN110535498B (en) 2018-12-28 2018-12-28 Channel State Information (CSI) feedback method and equipment

Publications (2)

Publication Number Publication Date
CN110535498A true CN110535498A (en) 2019-12-03
CN110535498B CN110535498B (en) 2022-10-18

Family

ID=68659809

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811625788.XA Active CN110535498B (en) 2018-12-28 2018-12-28 Channel State Information (CSI) feedback method and equipment

Country Status (2)

Country Link
CN (1) CN110535498B (en)
WO (1) WO2020135573A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020135573A1 (en) * 2018-12-28 2020-07-02 中兴通讯股份有限公司 Channel state information feedback method, apparatus, and storage medium
WO2020199954A1 (en) * 2019-03-29 2020-10-08 中兴通讯股份有限公司 Information mapping method, information acquisition method, terminal device and network device
WO2021128289A1 (en) * 2019-12-27 2021-07-01 Qualcomm Incorporated Uplink grant downlink control information for frequency domain compressed uplink precoding
WO2021155514A1 (en) * 2020-02-05 2021-08-12 Nokia Shanghai Bell Co., Ltd. Channel state information (csi) feedback enhancement depicting per-path angle and delay information
CN113783589A (en) * 2020-06-09 2021-12-10 华为技术有限公司 Transmission method of channel state information and related device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117792444A (en) * 2022-09-21 2024-03-29 维沃移动通信有限公司 PMI (PMI) combination coefficient sending method, PMI combination coefficient sending device and terminal

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102396162A (en) * 2009-06-23 2012-03-28 上海贝尔股份有限公司 Method for channel status information feedback and device thereof
CN106160926A (en) * 2015-04-08 2016-11-23 中兴通讯股份有限公司 The method and apparatus of feeding back channel state information in multi-input multi-output system
CN107888265A (en) * 2016-09-30 2018-04-06 中兴通讯股份有限公司 The feedback method and device of channel information, terminal, base station
CN108271265A (en) * 2017-01-03 2018-07-10 华为技术有限公司 Communication means, base station and terminal device
US20180254813A1 (en) * 2016-08-12 2018-09-06 Telefonaktiebolaget Lm Ericsson (Publ) Progressive advanced csi feedback
CN110535513A (en) * 2018-11-02 2019-12-03 中兴通讯股份有限公司 A kind of CSI feedback and method of reseptance, device, storage medium

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109039407A (en) * 2017-06-08 2018-12-18 索尼公司 Electronic equipment, communication means and storage medium in wireless communication system
CN110535498B (en) * 2018-12-28 2022-10-18 中兴通讯股份有限公司 Channel State Information (CSI) feedback method and equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102396162A (en) * 2009-06-23 2012-03-28 上海贝尔股份有限公司 Method for channel status information feedback and device thereof
CN106160926A (en) * 2015-04-08 2016-11-23 中兴通讯股份有限公司 The method and apparatus of feeding back channel state information in multi-input multi-output system
US20180254813A1 (en) * 2016-08-12 2018-09-06 Telefonaktiebolaget Lm Ericsson (Publ) Progressive advanced csi feedback
CN107888265A (en) * 2016-09-30 2018-04-06 中兴通讯股份有限公司 The feedback method and device of channel information, terminal, base station
CN108271265A (en) * 2017-01-03 2018-07-10 华为技术有限公司 Communication means, base station and terminal device
CN110535513A (en) * 2018-11-02 2019-12-03 中兴通讯股份有限公司 A kind of CSI feedback and method of reseptance, device, storage medium

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020135573A1 (en) * 2018-12-28 2020-07-02 中兴通讯股份有限公司 Channel state information feedback method, apparatus, and storage medium
WO2020199954A1 (en) * 2019-03-29 2020-10-08 中兴通讯股份有限公司 Information mapping method, information acquisition method, terminal device and network device
WO2021128289A1 (en) * 2019-12-27 2021-07-01 Qualcomm Incorporated Uplink grant downlink control information for frequency domain compressed uplink precoding
WO2021155514A1 (en) * 2020-02-05 2021-08-12 Nokia Shanghai Bell Co., Ltd. Channel state information (csi) feedback enhancement depicting per-path angle and delay information
CN113783589A (en) * 2020-06-09 2021-12-10 华为技术有限公司 Transmission method of channel state information and related device
CN113783589B (en) * 2020-06-09 2023-03-10 华为技术有限公司 Transmission method of channel state information and related device

Also Published As

Publication number Publication date
WO2020135573A1 (en) 2020-07-02
CN110535498B (en) 2022-10-18

Similar Documents

Publication Publication Date Title
CN110535498A (en) CSI back method and apparatus
US11539418B2 (en) Method, apparatus for channel state information feedback and storage medium
US10615856B2 (en) Methods and devices for determining precoder parameters in a wireless communication network
JP6692447B2 (en) CSI feedback method, precoding method, apparatus, terminal and base station
CN111342912B (en) Channel measurement method and communication device
CN107888264B (en) Feedback method and device of channel information
US10541735B2 (en) Beamforming using an antenna array
CN107196749B (en) Method and device for measuring channel state information and sending reference signal
KR101317136B1 (en) Method and system for precoding and method for constructing precoding codebook
US20220286261A1 (en) Method for Compressing Wireless Channel State Information Feedback
WO2018029645A2 (en) Multi-beam codebooks with further optimized overhead
BRPI0621788B1 (en) Method for reducing a pre-encoding feedback information in a minimal communication system, receiving unit and transmission unit
CN111342913B (en) Channel measurement method and communication device
CN108111211B (en) Feedback method and device of channel state information and management equipment
WO2016169213A1 (en) Acquisition method and device for acquiring channel information
CN105337683B (en) A kind of transmitting method of weighting and device for CSI feedback system
KR20210100710A (en) How to enable analog precoding and analog combining
CN112054824B (en) Channel measurement method and communication device
KR102528368B1 (en) Method and device for reporting antenna port weight vector, method and device for obtaining antenna port weight vector, processing device and storage medium
CN106817720B (en) A kind of method and device obtaining channel information
WO2023063844A1 (en) Devices and methods for generating compressed channel state information
CN114826444A (en) Method for measuring and reporting downlink channel state information and user equipment
Achoura et al. Impact of Limited Feedback on MIMO-OFDM Systems using Joint Beamforming
KR20180037685A (en) Method and apparatus for feedback of channel state information

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant