CN101958773B - The method of feedback channel information and terminal - Google Patents

Abstract

The invention discloses method and the terminal of a kind of feedback channel information, the method includes: terminal row physically shares feeding back channel state information on channel or Physical Uplink Control Channel, wherein, channel condition information includes: RI, the first code book index PMI1, the second code book index PMI2 and CQI, in the case of this form of solid size that total code book is this equivalence of dicode, PMI2 is used for indicating code book C_PUSCHA code word in (r), code book C_PUSCHR, in () code book C (r) corresponding to RI by total code book, the partial codeword in one group codeword set corresponding with PMI1 is constituted；In the case of total code book is this form of dicode, PMI2 is used for indicating code bookIn a code word, wherein, code bookBy the second code book C corresponding to RI of total code book²R the partial codeword in () is constituted.Present invention decreases the expense of feedback, improve the performance of system.

Description

The method of feedback channel information and terminal

Technical field

The present invention relates to the communications field, in particular to method and the terminal of a kind of feedback channel information.

Background technology

In wireless communication system, transmitting terminal and receiving terminal take the mode of spatial reuse to use many antennas to obtain higher Speed.Relative to general method for spacial multiplex, the technology of a kind of enhancing be receiving terminal feedback channel information to transmitting terminal, send out Sending end uses according to the channel information obtained to launch after precoding technique processes launches, thus greatly improves transmission performance. For single user multiple-input and multiple-output (Multi-input Multi-output, referred to as MIMO), can directly use channel Characteristic vector information carries out precoding；For multiuser MIMO, then need channel information more accurately.

At Long Term Evolution (Long Term Evolution, referred to as LTE) in the works, the feedback of channel information is mainly Utilize the feedback method of better simply single code book, and the performance launching precoding technique of MIMO to rely more on wherein code book anti- The accuracy of feedback.The ultimate principle that channel information based on code book quantifies feedback is as follows:

Assume that Limited Feedback channel capacity is Bbps/Hz, then the number of available code word is N=2^BIndividual.Channel matrix Space of feature vectors through quantization constitute codebook spaceTransmitting terminal and receiving terminal preserve or real jointly Time produce this code book (sending and receiving end is identical).According to receiving terminal obtain channel matrix H, receiving terminal according to certain criterion fromMiddle choosing Select a code word mated most with channelAnd code word sequence number i is fed back to transmitting terminal.Here, code word sequence is known as precoding Matrix Indicator (Precoding Matrix Indicator, referred to as PMI).Transmitting terminal finds according to this sequence number i accordingly Pre-encoding codewordThus obtain channel information,Illustrate the characteristic vector information of channel.

In generalCan further be divided into the code book that multiple order (Rank) is corresponding, can correspondence under each Rank Multiple code words quantify the pre-coding matrix that this Rank lower channel characteristic vector is constituted.Owing to Rank and the non-zero characteristics of channel are vowed Amount number is equal, and therefore, in general Rank is that code word during N all can have N to arrange.So, code bookCan by Rank not With being divided into multiple sub-codebook, as shown in table 1.

Table 1

Wherein, the code word needing storage when Rank ＞ 1 is all matrix form, and wherein the code book in LTE protocol is adopted exactly The feedback method of this codebook quantification, in actually LTE, precoding codebook is meant that the same with channel information quantization codebook 's.Hereinafter, for the sake of unification, it is the matrix of 1 that vector can also regard a dimension as.

In a particular application, the code book feedback method of LTE specifically includes the following aspects:

(1) feedback granularity of channel information.In the standard of LTE, the minimum feedback unit of channel information is subband (Subband) channel information, a subband is made up of several Resource Block (Resource Block, referred to as RB), each RB Being made up of multiple Resource Units (Resource Element, referred to as RE), RE is the least unit of running time-frequency resource in LTE, LTE-A has continued to use the resource representation method of LTE.Several Subband are properly termed as Multi-Subband, a lot of Subband It is properly termed as broadband (Wideband).

(2) feedback content that channel information is relevant.(Channel State Information is called for short channel condition information For CSI) feedback includes: channel quality instruction (Channel quality indication, referred to as CQI) information, PMI and order Designator (Rank Indicator, referred to as RI).Here the CSI content that we pay close attention to most is PMI information, but RI and CQI is also Broadly fall into the content of information feedback.Wherein:

CQI is the index weighing down channel quality quality.In 36-213 agreement CQI with 0～15 integer value Representing, representing different CQI grades respectively, different CQI correspond to respective modulation system and encoder bit rate (MCS).

RI is for describing the number of space independent channel, the Rank of respective channels response matrix.At Open-Loop Spatial Multiplexing and Under Closed-Loop Spatial Multiplexing pattern, need UE to feed back RI information, need not under other patterns feed back RI information.The sum of ranks of channel matrix The number of plies is corresponding.

(3) mechanism that feedback of channel information is relevant.The feedback system of the uplink channel information in LTE is divided into two kinds: physics Periodic channel information feedback on ascending control channel (Physical Uplink Control Channel, referred to as PUCCH) With the aperiodic on physical uplink Data Shared Channel (Physical Uplink Shared Channel, referred to as PUSCH) Feedback of channel information.PUCCH is to control channel, and the reliability of feedback is higher, but its feedback resources is more valuable, and feedback overhead is subject to To strict restriction.PUSCH can provide more CSI feedback resource, therefore can preferably support single user spatial reuse (SU-MIMO) and Multi-User Dimension multiplexing (MU-MIMO) but reliability it cannot be guaranteed that, and because data to be taken transmission money Source, the transmission on data service has some impacts.

Senior Long Term Evolution (Long Term Evolution Advanced, referred to as LTE-A) system drilling as LTE Enter standard, support bigger system bandwidth (reaching as high as 100MHz), and the existing standard of backward compatibility LTE.In order to obtain more High community mean spectral efficiency and improve the covering of cell edge and handling capacity, LTE-A on the basis of existing LTE system, Descending at most can support 8 antennas, and in terms of code book feedback, propose technology that some feedbacks strengthen, in order to preferably Support MU-MIMO.Mainly strengthen the feedback accuracy of code book and utilize temporal correlation and/or the frequency domain correlation of channel information Draw in one's expenditure.This technology can improve ternational Mobile Telecommunications (the International Mobile of evolution Telecommunications-Advance, referred to as IMT-Advance) system the availability of frequency spectrum, alleviate frequency spectrum resource tight Lack.Simultaneously, it is contemplated that application main during 8 antenna will be dual-polarized situation, the design of code book and enhancing are also required to fully examine Consider the feature of dual polarization channel.

The main thought of the feedback technique of this enhancing code book is, the feedback of relative LTE increases the expense of PMI feedback, and Utilize the common status information representing channel of feedback of two PMI, mainly include two kinds of implementations:

Implementation one, definition dicode originally feeds back, in which with double PMI:

1) structure of the precoding/feedback of a subband is made up of two matrixes.

2) each matrix in two matrixes is under the jurisdiction of a single code book.Code book is the most pre-by base station and UE First know.The code word of feedback can be varied from different time and different subbands.

3) matrix represent broadband or long time channel attribute.Another matrix represents and determines on frequency band or in short-term The attribute of channel.

4) the matrix code book used represents with the form of limited denumerable matrix stack, and for UE and base station, each Matrix is all knowable.

5) one of them matrix can be a fixing matrix, it is not necessary to feedback.Now be equivalent to degenerate to solid size originally Feedback (may use in the case of the non-correlation channel of high sum of ranks low-rank).

It can be seen, the feedback aspect of channel information proposes a kind of structure based on dicode basis, further may be used To be described as:

For needing a subband of feedback channel information or multiple associating subband, UE is to two PMI information of base station feedback (some situation is not necessarily by feedback, it is also possible to a predefined PMI is fixed value, does not feeds back), respectively PMI1 and PMI2, the wherein code word W 1 in the corresponding code book C1 of PMI1, the code word W 2 in PMI2 correspondence another one code book C2.Base station end There is the information of identical C1 and C2, from corresponding code book C1 and C2, after receiving PMI1 and PMI2, find code word W 1 He of correspondence W2, and functional rule F according to a preconcerted arrangement, calculate W=F (W1, W2) and obtain channel information W.

Dicode the design criterion above is a kind of concrete code book form in LTE-A.When concrete implementation, only need The code book that W1 with W2 to be defined is corresponding, but there are in fact a code book corresponding for virtual W, a lot of aspect of performances in the design Consideration be all based on what code book corresponding for W considered.

Implementation two, the solid size of definition this equivalence of dicode originally feeds back, in which with double PMI:

Being integer for Rank=r, r, the place different from 4Tx code book above is, is using this this equivalence of dicode This feedback of solid size time, the code word in the code book that feedback is corresponding needs the feedback of 2 PMI to represent its information, this equivalence of dicode Solid size the most typically can be expressed as shown in table 2 below.

Table 2

HereBe one by i₁And i₂The code word indicated collectively, generally can be write as functional form W (i₁, i₂), only need I to be determined₁And i₂?.

φ_n=e^jπn/2

Such as, during r=1 ' definition v_m=[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T, the most as shown in table 3:

Table 3

Which actually with this pair of PMI equivalence of dicode, the most different being in this method does not re-define two codes This C1 and C2, the substitute is definition dicode basis and the code book corresponding for W of functional relationship composition thereof, i.e. in implementation one Virtual code book is by actual definition thus instead of C1C2.

Due in LTE-A, in order to preferably support the performance of MU-MIMO, the feedback accuracy enhancement techniques of employing makes The expense sum (it can be appreciated that expense of code book corresponding to W) that the information of feedback PMI1 with PMI2 needs is relative in LTE This expense of solid size have a larger increase, in addition, in order to strengthen the granularity of feedback, preferably support MU-MIMO, PUSCH Or on PUCCH, need a kind of new feedback model to feed back channel information and the CQI information of each subband.Code book due to feedback The granularity of precision and feedback has enhancing, and the problem brought is that expense is very big, has performance than more serious impact.Due to feedback The increase of expense can affect the transmission of normal data traffic, and therefore, this is the problem being badly in need of in prior art solving.

Summary of the invention

Present invention is primarily targeted at method and the terminal that a kind of feedback channel information is provided, at least to solve above-mentioned asking Topic.

One aspect of the present invention provides a kind of method of feedback channel information, including: terminal row physically is shared Feeding back channel state information on channel or Physical Uplink Control Channel, wherein, channel condition information includes: rank indication information RI, First code book index PMI1, the second code book index PMI2 and channel quality indicator (CQI), at the solid size that total code book is this equivalence of dicode In the case of this form, PMI2 is used for indicating code book C_PUSCHA code word in (r), code book C_PUSHCR () is by the correspondence of total code book In code book C (r) of RI, the partial codeword in one group codeword set corresponding with PMI1 is constituted.

Another aspect of the present invention provides a kind of method of feedback channel information, including: terminal row physically is altogether Enjoying feeding back channel state information on channel or Physical Uplink Control Channel, wherein, channel condition information includes: RI, the first code book Index PMI1, the second code book index PMI2 and CQI, in the case of total code book is this form of dicode, PMI2 is used for indicating code bookIn a code word, wherein, code bookBy the second code book C corresponding to RI of total code book²Part in (r) Code word is constituted.

An additional aspect of the present invention provides a kind of method of feedback channel information, including: terminal row physically is altogether Enjoying feeding back channel state information on channel or Physical Uplink Control Channel, wherein, channel condition information includes: RI, the first code book Index PMI1, the second code book index PMI2 and CQI, the minimum particle size indicated by PMI2 is different from the minimum particle size indicated by CQI.

Another aspect of the invention provides a kind of terminal, including: feedback module, share channel for row physically Or feeding back channel state information on Physical Uplink Control Channel, wherein, channel condition information includes: RI, the first code book index PMI1, the second code book index PMI2 and CQI, in the case of this form of solid size that total code book is this equivalence of dicode, PMI2 is used for Instruction code book C_PUSCHA code word in (r), code book C_PUSCHIn (r) code book C (r) corresponding to RI by total code book, with PMI1 The corresponding partial codeword in one group of codeword set is constituted.

Another aspect of the invention provides a kind of terminal, including: feedback module, share channel for row physically Or feeding back channel state information on Physical Uplink Control Channel, wherein, channel condition information includes: RI, the first code book index PMI1, the second code book index PMI2 and CQI, in the case of total code book is this form of dicode, PMI2 is used for indicating code bookIn a code word, wherein, code bookBy the second code book C corresponding to RI of total code book²Part in (r) Code word is constituted.

Another aspect of the invention provides a kind of terminal, including: feedback module, share channel for row physically Or feeding back channel state information on Physical Uplink Control Channel, wherein, channel condition information includes: RI, the first code book index PMI1, the second code book index PMI2 and CQI, the minimum particle size indicated by PMI2 is different from the minimum particle size indicated by CQI.

By the present invention, the on the one hand PMI2 of a feedback code word in the code book indicating compression, due in code book The number of codewords comprised is compressed, and therefore, the expense of PMI2 correspondingly reduces, on the other hand, and the minimum of PMI2 and CQI instruction Granularity can be different, thus without making PMI2 with CQI keep identical feedback granularity, feedback is more flexible, so, is also no need for Feed back PMI2 and CQI for each subband, thus reduce the expense of feedback, solve the code book essence of feedback in correlation technique Degree or granularity strengthen the problem causing expense to increase, and reduce the expense of feedback, improve the performance of system.

Accompanying drawing explanation

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this Bright schematic description and description is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the schematic diagram of the method for a kind of feedback channel information according to embodiments of the present invention；

Fig. 2 is the structured flowchart of a kind of terminal according to embodiments of the present invention；

Fig. 3 is the schematic diagram of the method for the feedback channel information according to embodiment 6；

Fig. 4 is the schematic diagram of the method for the feedback channel information according to embodiment 7.

Detailed description of the invention

Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments.It should be noted that do not conflicting In the case of, the embodiment in the application and the feature in embodiment can be mutually combined.

Fig. 1 is the schematic diagram of the method for a kind of feedback channel information according to embodiments of the present invention, as it is shown in figure 1, the party In method, terminal row physically shares feeding back channel state information (specifically, Ke Yishi on channel or Physical Uplink Control Channel Receive lateral terminal and feed back to sending side terminal), wherein, this channel condition information includes: RI (hereinafter referred to as RI information), the first code book Index PMI1 (the hereinafter referred to as the oneth PMI index information), the second code book index PMI2 (the hereinafter referred to as the 2nd PMI index information) and CQI (hereinafter referred to as CQI information), PMI2 is for indicating corresponding in the code book (being also referred to as sub-codebook below) after the compression of this RI Code word.

On PUSCH or PUCCH during feedback, need to feed back the PMI1 in a broadband and the PMI2 of multiple subband, subband PMI2 can take bigger expense.Owing to the design of the code book of LTE-A stresses to employ bigger expense with performance guarantee, actual Upper minimizing partial codeword will not bring being remarkably decreased of performance.Therefore, in said method, arranging the code book indicated by PMI2 is Through the code book (for example, it is possible to choosing one sub-codebook of effective code construction) of overcompression, so, can subtract when feeding back PMI2 Few a large amount of expenses.

It should be noted that in order to reduce the change to existing code book, can be based on the codebook construction in LTE-A one The sub-codebook that some transmission mode uses in PUSCH or PUCCH, thus expense when reducing feedback PMI2.

Preferably, the minimum particle size indicated by PMI2 can be differently configured from the minimum particle size indicated by CQI.In the method, PMI2 and CQI is without keeping identical feedback granularity, and feedback is more flexible, so, is also no need for feeding back for each subband PMI2 and CQI, thus further reduce the expense of feedback.

Hereinafter dicode this equivalence solid size is originally illustrated respectively with dicode situation originally:

(1) total code book is this form of solid size of this equivalence of dicode

PMI2 is used for indicating code book C_PUSCHA code word in (r), wherein, code book C_PUSCHR () is corresponded to by total code book In code book C (r) of this RI, the partial codeword in one group codeword set corresponding with above-mentioned PMI1 is constituted.Wherein, for the ease of PMI2 indicates concrete code word, code book C_PUSCHR the number of codewords comprised in () can be the number of codewords comprised in code book C (r) 1/2 or 1/4, certainly, as long as selecting partial codeword composition C_PUSCH(r), it is possible to reduce the indicated value of PMI2, thus reduce transmission Expense used by PMI2.

Sub-codebook in the case of 1-4 describes this form of solid size that total code book is this equivalence of dicode in detail by the following examples Constituted mode, in which, the 2nd PMI index instruction code book C corresponding to RI=r_PUSCHIn (r), a PMI index information pair A code word in the one group of codeword set answered, C_PUSCHR () is code book C corresponding for RI=r in the total code book C defined in LTE-A In r one group of codeword set that in (), a PMI index information is corresponding, partial codeword is constituted.

Embodiment 1

The dicode this equivalence this C of solid size (r) of the Rank2 of LTE-A is as shown in table 4 below:

Table 4

Wherein φ_n=e^jπn/2, v_m=[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。

Being the matrix that determines of a value needing m and n, m, n are integer, m, n and the first index i needing feedback₁With Second index i₂Relevant.

(1) consider that each subband feedback saves 1bit expense, then can select 8 from the code word of the 16 of C (r) above Individual code word constitutes C_PUSCH(r)。

It is also preferred that the left it may be that from upper table Index be 0～7 code word matrix in optional 4 code words, from upper table Index be 8～15 code word matrix in optional 4 code words collectively form C_PUSCH(r)。

It is also preferred that the left it may be that from upper table Index be 0,2,4,6,8,10,12,14 code word matrix in optional 4 codes Word, from upper table Index be 1,3,5,7,9,11,13,15 code word matrix in optional 4 code words collectively form C_PUSCH(r)。

From upper table, Index is 0, Isosorbide-5-Nitrae, optional 4 code words, Index from upper table in the code word matrix of 5,8,9,12,13 It is that in the code word matrix of 2,3,6,7,10,11,14,15, optional 4 code words collectively form C_PUSCH(r)。

(2) consider that each subband feedback saves 2bit expense, then can select 4 from the code word of the 16 of C (r) above Individual code word constitutes C_PUSCH(r)。

It is also preferred that the left it may be that from upper table Index be 0～7 code word matrix in optional 2 code words, from upper table Index be 8～15 code word matrix in optional 2 code words collectively form C_PUSCH(r)。

It is also preferred that the left it may be that from upper table Index be 0～3 code word matrix in optional 2 code words, from upper table Index be 4～7 code word matrix in optional 2 code words collectively form C_PUSCH(r)。

Such as, C_PUSCHR () can be as shown in table 5 below:

Table 5

I.e. C_PUSCHR () is that in C (r), index is 0,8 code words of 3,4,7,8,11,12,15.It is of course also possible to be C_PUSCH R () is other 8 code words remaining in C (r).

Such as, C_PUSCHR () can be as shown in table 6 below:

Table 6

I.e. C_PUSCHR () is that in C (r), index is 8 code words of 0-7.It is of course also possible to be C_PUSCHR () is residue in C (r) Other 8 code words.

Or, C_PUSCHR () can be as shown in table 7 below:

Table 7

I.e. C_PUSCHR () is that in C (r), index is 0, Isosorbide-5-Nitrae, 8 code words of 5,8,9,12,13, it is of course also possible to be C_PUSCH R () is other 8 code words remaining in C (r).

Or, C_PUSCHR () can be as shown in table 8 below:

Table 8

I.e. C_PUSCHR () is that in C (r), index is 0,8 code words of 2,4,6,8,10,12,14, it is of course also possible to be C_PUSCH R () is other 8 code words remaining in C (r).

Or, C_PUSCHR () can be as shown in table 9 below:

Table 9

I.e. C_PUSCHR () is that in C (r), index is 0,4 code words of 2,4,6.

Or C_PUSCHR () can also be as shown in table 10 below:

Table 10

I.e. C_PUSCHR () is that in C (r), index is 0, Isosorbide-5-Nitrae, 4 code words of 5.

Or C_PUSCHR () can be as shown in table 11 below:

Table 11

I.e. C_PUSCHR () is that in C (r), index is 0,4 code words of 3,4,7.

I in above example₂The coding rule of corresponding code word can be changed on the premise of not changing code book essence, The embodiment that extraction example describes is mainly the feature extraction according to code word rather than numbered features extraction.Described C (r) and C_PUSCH (r) complete code word arbitrarily arrange exchange, be multiplied by constant coefficient or all code words jointly go exchange conversion after formed Code book with conversion before code book equivalence.

Embodiment 2

The dicode this equivalence this C of solid size (r) of LTE-A Rank3 is as shown in table 12 below:

Table 12

Wherein φ_n=e^jπn/2, v_m=[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T,It is needs m, a m ', M " the matrix that determines of value, these parameters and the first index i needing feedback₁With the second index i₂Relevant.

(1) consider that each subband feedback saves 1bit expense, then can select 8 from the code word of the 16 of C (r) above Individual code word constitutes C_PUSCH(r)。

It is also preferred that the left it may be that from upper table Index be 0～3 code word matrix in optional 2 code words, from upper table Index be 4～7 code word matrix in optional 2 code words, from upper table Index be 8～11 code word matrix in optional 2 codes Word, from upper table Index be 12～15 code word matrix in optional 2 code words, collectively form C_PUSCH(r)

(2) consider that each subband feedback saves 2bit expense, then can select 8 from the code word of the 16 of C (r) above Individual code word constitutes C_PUSCH(r)。

It is also preferred that the left it may be that from upper table Index be 0～3 code word matrix in optional 1 code word, from upper table Index be 4～7 code word matrix in optional 1 code word, from upper table Index be 8～11 code word matrix in optional 1 code Word, from upper table Index be 12～15 code word matrix in optional 1 code word, collectively form C_PUSCH(r)C_PUSCHR () can be as Shown in table 13 below:

Table 13

I.e. C_PUSCHR () is that in C (r), index is 0, Isosorbide-5-Nitrae, 8 code words of 5,8,9,12,13, naturally it is also possible to be C_PUSCH R () is other 8 code words remaining in C (r).

Or C_PUSCHR () is as shown in table 14 below:

Table 14

I.e. C_PUSCHR () includes index in C (r) is 0,8 code words of 1,6,7,8,9,14,15, it is also possible to be C_PUSCH R () is other 8 code words remaining in C (r).

Or C_PUSCHR () is that in C (r), index is 0,8 code words of 2,5,7,8,10,13,15, it is of course also possible to be C_PUSCHR () is other 8 code words remaining in C (r).

Or C_PUSCHR () is that in C (r), index is 0,8 code words of 2,4,6,8,10,12,14, it is also possible to be C_PUSCH(r) For other 8 code words remaining in C (r).

Or C_PUSCH(r) be:

In C (r), index is 0,4 code words of 5,10,15.

In C (r), index is 0,4 code words of 4,8,12.

In C (r), index is 1,4 code words of 5,9,13.

In C (r), index is 2,4 code words of 6,10,14.

In C (r), index is 3,4 code words of 7,11,15.

In C (r), index is 0,4 code words of 5,8,13.

I in above example₂The coding rule of corresponding code word can be changed on the premise of not changing code book essence, The embodiment that extraction example describes is mainly the feature extraction according to code word rather than numbered features extraction.Described C (r) and C_PUSCH (r) complete code word arbitrarily arrange exchange, be multiplied by constant coefficient or all code words jointly go exchange conversion after formed Code book with conversion before code book equivalence.

Embodiment 3

The dicode this equivalence this C of solid size (r) of LTE-A Rank4 is as shown in table 15 below:

Table 15

Wherein φ_n=e^jπn/2, v_m=[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。

It is a needs m, the matrix that the value of m ', n determines, these parameters and the first index i needing feedback₁With Second index i₂Relevant.

(1) expense of consideration saving 1bit:

C_PUSCHR () is that in C (r), index is 0,4 code words of 2,4,6 or other 4 code words.

C_PUSCHR () is that in C (r), index is 0,4 code words of 3,4,7 or other 4 code words.

C_PUSCHR () is that in C (r), index is 0, Isosorbide-5-Nitrae, 4 code words of 5 or other 4 code words.

Embodiment 4

The dicode this equivalence this C of solid size (r) of LTE-A Rank1 is as shown in table 16 below:

Table 16

Wherein φ_n=e^jπn/2, v_m=[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T.It is that a value needing m and n determines Matrix, m, n are integer, m, n with need feedback first index i₁With the second index i₂Relevant.

C_PUSCHR () is that in C (r), index is 0, any 4 code words and index in 2,4,6,8,10,12,14 are 1,3,5, The code book that any 4 code words in 7,9,11,13,15 are constituted.

Can be further C_PUSCHR () is that index is 0 in C (r), 4,8,12, in any 2 code words and index be 2, Any 2 code words in 6,10,14, index is 1, and any 2 code words in 5,9,13, index is 3, any 2 in 7,11,15 The code book that individual code word is constituted.

Can also is that C_PUSCHR () is index Index0 in C (r), the code book that 8 code words of 1,2,3,8,9,10,11 are constituted, Or the code book that other 8 code words are constituted.

Can also is that C_PUSCHR () is that index is any 4 code words in 0～7 and index is any in 8～15 in C (r) The code book that 4 code words are constituted.

Can be further C_PUSCHR () is that index is 0～3 in C (r), in any 2 code words and index be in 4～7 Any 2 code words, index is any 2 code words in 8～11, and index is that any 2 code words in 12～15 collectively form Code book.

(2) total code book is this form of dicode

PMI2 is used for indicating code bookIn a code word, wherein, code bookBy corresponding to of total code book The second code book C of RI²R the partial codeword in () is constituted.Wherein, concrete code word, code book are indicated for the ease of PMI2 In the number of codewords that comprises can be this C of second code²The 1/2 or 1/4 of the number of codewords comprised in (r), certainly, if selection portion Demal word formsJust can reduce the indicated value of PMI2, thus reduce transmission expense used by PMI2.

The constituted mode of sub-codebook in the case of the 5 total code books of detailed description are this form of dicode by the following examples, should In mode, the time code book of RI=r in the 2nd PMI index instruction the second code bookIn a code word, described Code book C corresponding for RI=r in total code book C defined in LTE-A²R in (), partial codeword is constituted.

Embodiment 5

As LTE-A Rank2 code book can also realize by following dicode mode originally, it is expressed as C¹(r) and C²(r) two codes This, PMI 1 indicates C¹R a code word in (), PMI2 indicates C²R a code word in (), two code words are by a regulation Function represents channel information jointly, such as multiplicative function.

C¹R () (code book that W1 is corresponding) is by m₁Individual code word W₁ ^(k)Constitute

$X^{\left(k\right)}\∈\{\left[\begin{array}{cccc}{b}_{\left(\frac{N_b}{2}k\right)\mathrm{mod}N}& b_{(\frac{N_b}{2}k+1)\mathrm{mod}N}& ...& b_{(\frac{N_b}{2}k+N_b-1)\mathrm{mod}N}\end{array}\right]:k=\mathrm{0,1},...,m_1-1\}$

${W_1}^{\left(k\right)}=\left[\begin{array}{cc}{X}^{\left(k\right)}& 0\\ 0& X^{\left(k\right)}\end{array}\right],$ C₁={ W₁ ⁽⁰⁾, W₁ ⁽¹⁾, W₁ ⁽²⁾..., W₁ ^(2N/Nb-1)}

N_bFor matrix X^(k)Columns, b_iIt is a vector, the most typically DFT vector (but it is not limited to this The situation of kind), one has N number of basic vector b₀～b_N-1, further description is:

B=[b₀ b₁ … b_N-1], ${\left[B\right]}_{1+m,1+n}=e^{j\frac{2\mathrm{\πmn}}{N}},$ M=0,1 ...,N=0,1 ..., N-1

Wherein, N_txFor a parameter relevant to the dimension of vector, it is often referred to launch antenna number.N is the integer power of 2. N_tx=8, N_b=4, N=32,16 code words comprised are:

${W_1}^{\left(k\right)}=\left[\begin{array}{cc}{X}^{\left(k\right)}& 0\\ 0& X^{\left(k\right)}\end{array}\right],$ C₁={ W₁ ⁽⁰⁾, W₁ ⁽¹⁾, W₁ ⁽²⁾..., W₁ ⁽¹⁵⁾}

X⁽⁰⁾=[b₀ b₁ … b₃] X⁽¹⁾=[b₂ b₃ … b₅] X⁽²⁾=[b₄ b₅ … b₇] ......X⁽¹⁴⁾=[b₂₈ b₂₉ … b₃₁] X⁽¹⁵⁾=[b₃₀ b₃₁ b₁ b₂]

C²R () (code book that W2 is corresponding) is by m₂Individual code word is constituted, and wherein comprises during Rank2

$C^2=\{\frac{1}{\sqrt{2}}\left[\begin{array}{cc}{Y}_1& Y_2\\ Y_1& {-Y}_2\end{array}\right],\frac{1}{\sqrt{2}}\left[\begin{array}{cc}{Y}_1& Y_2\\ {\mathrm{jY}}_1& {-\mathrm{jY}}_2\end{array}\right]\}$

$(Y_1,Y_2)\∈\{({\tilde{e}}_1,{\tilde{e}}_1),({\tilde{e}}_2,{\tilde{e}}_2),({\tilde{e}}_3,{\tilde{e}}_3),({\tilde{e}}_4,{\tilde{e}}_4),({\tilde{e}}_1,{\tilde{e}}_2),\left({\tilde{e}}_2{,\tilde{e}}_3\right),({\tilde{e}}_1,{\tilde{e}}_4),({\tilde{e}}_2,{\tilde{e}}_4)\}$

Wherein,ForVector, i-th element be 1 other element be 0, actual is the vector of a column selection, Work as W₁ ^(k)WithIt can be understood as choose X when middle code word is multiplied^(k)In row construct the code word in code book corresponding to W.

Code book corresponding for W comprisesIn arbitrary code word premultiplicationIn the code word that obtains of arbitrary code word, i.e. have m₁× m₂Individual code word.I.e. the solid size of this equivalence of dicode in embodiment 1 is originally.

For this and embodiment 1 equivalence code book, feedback RI information r on the shared channel of terminal row physically, first PMI index information i₁, the 2nd PMI index information i₂And CQI information.The time-code of RI=r in 2nd PMI index instruction the second code book ThisIn a code word, describedCode book C corresponding for RI=r in total code book C defined in LTE-A²(r) Middle partial codeword is constituted.

Owing to code book is of equal value, can be according to the structure C described in embodiment 1_PUSCHR the method for () constructsRight Situation in other order, it is possible to use identical method.

Although saying as a example by feedback on channel it should be noted that above embodiment is all shared by row physically Bright, but, the method is equally applicable to go physically control to feed back on channel, and sub-codebook can use in above example Mode is constituted, and does not repeats them here.

Fig. 2 is the structured flowchart of a kind of terminal according to embodiments of the present invention, as in figure 2 it is shown, this terminal includes: feedback mould Block 22, shares feeding back channel state information on channel or Physical Uplink Control Channel, wherein, described channel for row physically Status information includes: RI, the first code book index PMI1, the second code book index PMI2 and CQI, and this PMI2 is for indicating corresponding to this A code word in code book after the compression of RI.

Wherein, in the case of this form of solid size that total code book is this equivalence of dicode, PMI2 is used for indicating code book C_PUSCH(r) In a code word, code book C_PUSCHIn (r) code book C (r) corresponding to this RI by total code book, the one group code corresponding with this PMI1 Partial codeword in word set is constituted.

Wherein, in the case of total code book is this form of dicode, this PMI2 is used for indicating code bookIn a code Word, wherein, code bookBy the second code book C corresponding to this RI of total code book²R the partial codeword in () is constituted.

This embodiment additionally provides a kind of method of feedback channel information, including: terminal row physically share channel or Feeding back channel state information on Physical Uplink Control Channel, wherein, this channel condition information includes: RI, the first code book index PMI1, the second code book index PMI2 and CQI, the minimum particle size indicated by this PMI2 is different from the minimum particle size indicated by this CQI.

In the method, PMI2 and CQI is without keeping identical feedback granularity, and feedback is more flexible, so, is also no need for pin Each subband is fed back PMI2 and CQI, thus reduces the expense of feedback.

Preferably, the minimum particle size indicated by PMI2 is the channel information of N number of RB, and the minimum particle size indicated by CQI is M The channel information of RB, wherein, N and M is positive integer and less than the maximum RB number under current bandwidth, N/M or M/N is whole more than 1 Number.

Terminal row physically is shared and is fed back RI information r, a PMI index information on channel or Physical Uplink Control Channel i₁, several the 2nd PMI index information i₂And several CQI information, the quantity of the PMI2 that terminal is specifically fed back and the quantity of CQI Can determine according to the most indicated minimum particle size.

The present embodiment additionally provides a kind of terminal, including: feedback module 22, share channel or physics for row physically Feeding back channel state information on ascending control channel, wherein, channel condition information includes: RI, the first code book index PMI1, second Code book index PMI2 and CQI, the minimum particle size indicated by this PMI2 is different from the minimum particle size indicated by this CQI.

Below by embodiment 6-7, describe feedback method detailed that CQI with PMI is used different feedback granularity Processing procedure.

Embodiment 6

Fig. 3 is the schematic diagram of the method for the feedback channel information according to embodiment 6, as it is shown on figure 3, PMI2 is for each Subband carries out feeding back, and CQI feeds back for 2 Subband, relative to each subband feed back a PMI and CQI, so can save expense.Under the CQI little scene of change, performance will not cause and is decreased obviously.

Embodiment 7

Fig. 4 is the schematic diagram of the method for the feedback channel information according to embodiment 7, and as shown in Figure 4, CQI is for each Subband carries out feeding back, and PMI2 feeds back for 2 Subband, feeds back a PMI relative to each subband And CQI, so can save expense.Under the PMI little scene of change, performance will not cause and is decreased obviously.

In sum, the scheme that the embodiment of the present invention provides can ensure on PUSCH or PUCCH fine by rational expense Support MU-MIMO performance.

It should be noted that can be at such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing Computer system performs, and, although show logical order in flow charts, but in some cases, can be with not It is same as the step shown or described by order execution herein.

Obviously, those skilled in the art should be understood that each module of the above-mentioned present invention or each step can be with general Calculating device realize, they can concentrate on single calculating device, or be distributed in multiple calculating device and formed Network on, alternatively, they can with calculate the executable program code of device realize, it is thus possible to by they store Performed by calculating device in the storage device, or they are fabricated to respectively each integrated circuit modules, or by them In multiple modules or step be fabricated to single integrated circuit module and realize.So, the present invention be not restricted to any specifically Hardware and software combines.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies Change, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (13)

1. the method for a feedback channel information, it is characterised in that including:

Terminal row physically shares feeding back channel state information on channel or Physical Uplink Control Channel, wherein, described channel Status information includes: rank indication information RI, the first code book index PMI1, the second code book index PMI2 and channel quality indicator (CQI), In the case of this form of solid size that total code book is this equivalence of dicode, described PMI2 is used for indicating code book C_PUSCHIn (r) one Code word, code book C_PUSCHIn (r) code book C (r) corresponding to described RI by described total code book, the one group code corresponding with described PMI1 Partial codeword in word set is constituted, and the minimum particle size indicated by described PMI2 is different from the granule indicated by described CQI Degree.

Method the most according to claim 1, it is characterised in that described code book C_PUSCHR the number of codewords comprised in () is institute State the 1/2 or 1/4 of the number of codewords comprised in code book C (r).

Method the most according to claim 1, it is characterised in that in the case of described RI is 2, described partial codeword passes through One of in the following manner determines:

From codeword set 4 code words of middle selection, from codeword set 4 code words of middle selection；

From codeword set 4 code words of middle selection, from codeword set 4 code words of middle selection；

From codeword set 4 code words of middle selection, from codeword set 4 code words of middle selection；

Select codeword set In whole code words；

Select codeword set In whole code words；

Select codeword set In whole code words；

Select codeword set In whole code words；

Select codeword set In whole code words；

Select codeword set In whole code words；

From codeword set 2 code words of middle selection, from codeword set 2 code words of middle selection；

From codeword set2 code words of middle selection, from codeword set2 code words of middle selection；

Wherein, i₁For the value of described PMI1,φ_n=e^jπn/2,v_m=[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。

Method the most according to claim 3, it is characterised in that in the case of described RI is 2, described partial codeword be with One of lower:

With

With With

With

With

Method the most according to claim 1, it is characterised in that in the case of described RI is 3, described partial codeword passes through One of in the following manner determines:

From codeword set2 code words of middle selection, from code Word set2 code words of middle selection, from codeword set2 code words of middle selection, from codeword set2 code words of middle selection；

From codeword set1 code word of middle selection, from code Word set1 code word of middle selection, from codeword set1 code word of middle selection, from codeword set1 code word of middle selection；

Wherein, i₁For the value of described PMI1, φ_n=e^jπn/2,v_m=[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。

Method the most according to claim 1, it is characterised in that in the case of described RI is 3, described partial codeword be with One of lower:

With

With

With

With

With

With

With

With

With

With

With

With

With

With

Wherein, i₁For the value of described PMI1, φ_n=e^jπn/2,v_m=[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。

Method the most according to claim 1, it is characterised in that in the case of described RI is 4, described partial codeword be with One of lower:

With

With

With

With

With

With

Wherein, i₁For the value of described PMI1,φ_n=e^jπn/2,v_m =[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。

Method the most according to claim 1, it is characterised in that in the case of described RI is 1, described partial codeword passes through One of in the following manner determines:

From codeword set Middle selection 4 Individual code word, from codeword set In Select 4 code words；

From codeword set2 code words of middle selection, from codeword set2 code words of middle selection, from codeword set 2 code words of middle selection, from codeword set2 code words of middle selection；

From codeword set Middle selection 4 Individual code word, from codeword set 4 code words of middle selection；

From codeword set2 code words of middle selection, from codeword set2 code words of middle selection, from codeword set 2 code words of middle selection, from codeword set2 code words of middle selection；

Wherein, i₁For the value of described PMI1,φ_n=e^jπn/2,v_m=[1 e^j2πm/32 e^j4πm/32 e^j6πm/32 ]^T。

Method the most according to claim 8, it is characterised in that in the case of described RI is 1, described partial codeword be with One of lower:

With

With

10. the method for a feedback channel information, it is characterised in that including:

Terminal row physically shares feeding back channel state information on channel or Physical Uplink Control Channel, wherein, described channel Status information includes: RI, the first code book index PMI1, the second code book index PMI2 and CQI, be this form of dicode at total code book In the case of, described PMI2 is used for indicating code bookIn a code word, wherein, code bookBy described total code book The second code book C corresponding to described RI²R the partial codeword in () is constituted, the minimum particle size indicated by described PMI2 is different In the minimum particle size indicated by described CQI.

11. methods according to claim 10, it is characterised in that described code bookIn the number of codewords that comprises be Described second code book C²The 1/2 or 1/4 of the number of codewords comprised in (r).

12. 1 kinds of terminals, it is characterised in that including:

Feedback module, feeding back channel state information on the shared channel of row physically or Physical Uplink Control Channel, wherein, Described channel condition information includes: RI, the first code book index PMI1, the second code book index PMI2 and CQI, be dicode at total code book In the case of this form of solid size of this equivalence, described PMI2 is used for indicating code book C_PUSCHA code word in (r), code book C_PUSCH In (r) code book C (r) corresponding to described RI by described total code book, the portion in one group codeword set corresponding with described PMI1 Demal word is constituted, and the minimum particle size indicated by described PMI2 is different from the minimum particle size indicated by described CQI.

13. 1 kinds of terminals, it is characterised in that including:

Feedback module, feeding back channel state information on the shared channel of row physically or Physical Uplink Control Channel, wherein, Described channel condition information includes: RI, the first code book index PMI1, the second code book index PMI2 and CQI, be dicode at total code book In the case of this form, described PMI2 is used for indicating code bookIn a code word, wherein, code bookBy institute State the second code book C corresponding to described RI of total code book²R the partial codeword in () is constituted, the minimum indicated by described PMI2 Granularity is different from the minimum particle size indicated by described CQI.