WO2012041102A1 - Procédé et terminal pour rétroaction d'information canal - Google Patents

Procédé et terminal pour rétroaction d'information canal Download PDF

Info

Publication number
WO2012041102A1
WO2012041102A1 PCT/CN2011/076738 CN2011076738W WO2012041102A1 WO 2012041102 A1 WO2012041102 A1 WO 2012041102A1 CN 2011076738 W CN2011076738 W CN 2011076738W WO 2012041102 A1 WO2012041102 A1 WO 2012041102A1
Authority
WO
WIPO (PCT)
Prior art keywords
codebook
codeword
select
codewords
pmi2
Prior art date
Application number
PCT/CN2011/076738
Other languages
English (en)
Chinese (zh)
Inventor
陈艺戬
李儒岳
李书鹏
张峻峰
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2012041102A1 publication Critical patent/WO2012041102A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0482—Adaptive codebooks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic

Definitions

  • the present invention relates to the field of communications, and in particular to a method and a terminal for feeding back channel information.
  • a transmitting end and a receiving end use a plurality of antennas to obtain a higher rate in a spatial multiplexing manner.
  • an enhanced technology is that the receiving end feeds back channel information to the transmitting end, and the transmitting end uses the transmitting precoding technology to process and transmit according to the obtained channel information, thereby greatly improving the transmission performance.
  • MIMO multi-input multi-output
  • channel feature vector information can be directly used for precoding.
  • multi-user MIMO more accurate channel information is needed.
  • the feedback of channel information is mainly based on the feedback method of a simple single codebook, and the performance of MIMO transmit precoding technology depends on the accuracy of the codebook feedback. degree.
  • the receiving end selects a code word F that best matches the channel according to a certain criterion, and feeds back the code word number back to the transmitting end.
  • the codeword sequence number is called a Precoding Matrix Indicator (PMI)terrorism
  • the transmitting end finds the corresponding precoding codeword ⁇ according to the sequence number i, thereby obtaining channel information, indicating the feature vector of the channel.
  • the information may be further divided into codebooks corresponding to multiple ranks, and each Rank corresponds to multiple codewords to quantize the precoding matrix formed by the channel feature vectors under the Rank. The number of non-zero feature vectors is equal. Therefore, in general, when the Rank is ⁇ , the codewords will have a queue. Therefore, the codebook can be divided into multiple subcodebooks according to the difference of Rank, as shown in Table 1. Table 1
  • the codewords to be stored in the range of Rank>l are in the form of a matrix, wherein the codebook in the LTE protocol is a feedback method of such codebook quantization, in fact, the precoding codebook and the channel information quantization code in LTE are used.
  • the meaning is the same.
  • the vector can also be viewed as a matrix of dimension 1.
  • the LTE codebook feedback method specifically includes the following aspects:
  • the minimum feedback unit of channel information is subband (Subband) channel information, and one subband is composed of thousands of resource blocks (RBs, RB for short).
  • the RBs are composed of a plurality of resource elements (Resources, RE for short), and the RE is the smallest unit of time-frequency resources in LTE.
  • the LTE resource representation method is used in LTE-A.
  • Several Subbands can be called Multi-Subbands, and many Subbands can be called Broadbands.
  • Channel information related feedback content Channel State Information (CSI) feedback includes Channel Quality Indication (CQI) information, PMI, and Rank Indicator (Rank Indicator, RP for short) ).
  • CQI Channel Quality Indication
  • PMI Channel Quality Indication
  • Rank Indicator Rank Indicator
  • RP Rank Indicator
  • CQI is an indicator to measure the quality of downlink channels.
  • CQI is represented by integer values from 0 to 15, representing different CQI levels, and different CQIs correspond to their respective modulation modes and code rate (MCS).
  • MCS modulation modes and code rate
  • the RI is used to describe the number of spatially independent channels, corresponding to the Rank of the channel response matrix.
  • the UE In the open-loop spatial multiplexing and closed-loop spatial multiplexing mode, the UE needs to feed back the RI information. In other modes, the RI information is not required to be fed back.
  • the rank of the channel matrix corresponds to the number of layers.
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Control Channel
  • SU-MIMO single-user spatial multiplexing
  • MU-MIMO multi-user spatial multiplexing
  • LTE-A Long Term Evolution Advanced
  • LTE-A Long Term Evolution Advanced
  • LTE-A can support up to 8 antennas on the basis of the existing LTE system, and proposes some codebook feedback.
  • Feedback enhanced technology to better support MU-MIMO.
  • the technique of feedback enhancement is mainly to enhance the feedback accuracy of the codebook and to utilize the temporal correlation of the channel information and/or the frequency domain correlation compression overhead. This technology can improve the spectrum utilization of the evolved International Mobile Telecommunications-Advance ( ⁇ -Advance) system and alleviate the shortage of spectrum resources.
  • the design and enhancement of the codebook also need to fully consider the characteristics of the dual polarization channel.
  • the main idea of the feedback technology of the enhanced codebook is that the feedback of the LTE is increased by the feedback of the LTE, and the feedback of the two PMIs is used to represent the state information of the channel, which mainly includes two implementation modes: implementation manner 1, definition Dual codebook and dual PMI feedback, in this way: 1)
  • the structure of the precoding/feedback of a subband consists of two matrices.
  • Each of the two matrices belongs to a separate codebook.
  • the codebook is known in advance by the base station and the UE.
  • the feedback codewords can vary at different times and on different subbands.
  • One matrix represents the properties of the wideband or long-term channel, and the other matrix represents the properties of the determined frequency band or short-term channel.
  • the matrix codebook used is represented in the form of a finite number of matrix sets, and for the UE and the base station, each matrix is known.
  • One of the matrices can be a fixed matrix without feedback. This is equivalent to degenerating to single codebook feedback (possibly in the case of high rank and low rank uncorrelated channels).
  • the feedback of the channel information proposes a structure based on the dual codebook, which can be further described as follows: For one subband or multiple joint subbands that need feedback channel information, the UE feeds back two PMIs to the base station. Information (in some cases, it is not necessary to pass feedback, it is also possible to predefine a PMI to be a fixed value without feedback), which are PMI1 and PMI2 respectively, where PMI1 corresponds to codeword W1 in one codebook C1, and PMI2 corresponds to another codebook.
  • the base station has the same information of C1 and C2.
  • W2 Obtain channel information W.
  • the above dual codebook design criteria is a specific codebook form in LTE-A. In the specific implementation, only the codebook corresponding to W1 and W2 needs to be defined, but there is actually a virtual W corresponding codebook. In the design, more than four performance considerations are considered based on the codebook corresponding to W. In the second implementation manner, a dual codebook equivalent single codebook and dual PMI feedback are defined.
  • 2 is a codeword jointly indicated by and 2 , and can usually be written as a function form ⁇ 1 2 ;) Only need to determine and 2 can be.
  • ⁇ ⁇ e
  • This method is actually equivalent to the dual codebook dual PMI.
  • the only difference is that two codebooks C 1 and C2 are no longer defined in this method. Instead, the W code corresponding to the dual codebook and its functional relationship is defined. This, that is, the virtual codebook in the first implementation is actually defined instead of C 1 C2.
  • the feedback precision enhancement technology is used to make the sum of the overheads required to feed back the information of PMI 1 and PMI 2 (also can be understood as the overhead of the codebook corresponding to W). Compared with the overhead of single codebook in LTE, there is a large increase in overhead.
  • a primary object of the present invention is to provide a method and terminal for feeding back channel information to at least solve the above problems.
  • An aspect of the present invention provides a method for feeding back channel information, including: a terminal feeding back channel state information on a physical uplink shared channel or a physical uplink control channel, where the channel state information includes: rank indication information RI, first codebook Index PMI 1, second codebook index PMI2 and channel quality indicator CQI, in case the total codebook is a double codebook equivalent single codebook form, PMI2 is used to indicate a code in the codebook C praOT (r)
  • the codebook C praOT (r) is composed of a partial codeword in a set of codewords corresponding to PMI 1 in the codebook C(r) corresponding to RI of the total codebook.
  • Another aspect of the present invention provides a method for feeding back channel information, including: a terminal feeding back channel state information on a physical uplink shared channel or a physical uplink control channel, where channel state information
  • the method includes: RI, a first codebook index PMI1, a second codebook index PMI2, and a CQI.
  • PMI2 is used to indicate one codeword in the codebook C H ( ), wherein
  • the codebook ⁇ is composed of a partial codeword in the second codebook C 2 (r) corresponding to the RI of the total codebook.
  • a further aspect of the present invention provides a method for feeding back channel information, including: the terminal feeding back channel state information on a physical uplink shared channel or a physical uplink control channel, where the channel state information includes: RI, a first codebook index PMI1 The second codebook index PMI2 and CQI, the minimum granularity indicated by PMI2 is different from the minimum granularity indicated by the CQI.
  • a further aspect of the present invention provides a terminal, including: a feedback module, configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, where the channel state information includes: RI, a first codebook index PMI1
  • the second codebook index PMI2 and CQI in the case that the total codebook is a double codebook equivalent single codebook form, PMI2 is used to indicate a codeword in the codebook Cprart (r), codebook C WSOT W is composed of a partial codeword in a set of codewords corresponding to PMI1 in the codebook C(r) corresponding to RI of the total codebook.
  • a further aspect of the present invention provides a terminal, including: a feedback module, configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, where the channel state information includes: RI, a first codebook index PMI1 , PMI2 second codebook index and the CQI, in the case where the total code present in the form of a double codebook, PMI2 for indicating one codeword codebook C (r) in ⁇ OT, wherein a codebook C 2 ⁇ total The codebook corresponds to a partial codeword in the second codebook C 2 (r) of the RI.
  • a further aspect of the present invention provides a terminal, including: a feedback module, configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, where the channel state information includes: RI, a first codebook index PMI1
  • the second codebook index PMI2 and CQI the minimum granularity indicated by PMI2 is different from the minimum granularity indicated by the CQI.
  • the fed back PMI2 is used to indicate one codeword in the compressed codebook. Since the number of codewords included in the codebook is compressed, the overhead of PMI2 is correspondingly reduced.
  • PMI2 and The minimum granularity indicated by the CQI can be different, so that the PMI2 and the CQI do not need to maintain the same feedback granularity, and the feedback is more flexible, so that it is not necessary to feed back PMI2 and CQI for each subband, thereby reducing the overhead of feedback and solving the correlation.
  • the codebook accuracy or granularity enhancement feedback in the technology leads to an increase in overhead, reduces the overhead of feedback, and improves the performance of the system.
  • FIG. 1 is a schematic diagram of a method for feeding back channel information according to an embodiment of the present invention
  • FIG. 2 is a structural block diagram of a terminal according to an embodiment of the present invention
  • FIG. 3 is a feedback channel of Embodiment 6. Schematic diagram of a method of information
  • FIG. 4 is a schematic diagram of a method of feeding back channel information of Embodiment 7.
  • FIG. 1 is a schematic diagram of a method for feeding back channel information according to an embodiment of the present invention. As shown in FIG.
  • a terminal feeds back channel state information on a physical uplink shared channel or a physical uplink control channel (specifically, The receiving side terminal feeds back to the transmitting side terminal, where the channel state information includes: RI (hereinafter referred to as RI information), first codebook index PMI1 (hereinafter referred to as first PMI index information), and second codebook index PMI2 ( Hereinafter, the second PMI index information) and the CQI (hereinafter referred to as CQI information) are used, and the PMI 2 is used to indicate one of the compressed codebooks (hereinafter also referred to as subcodebooks) corresponding to the RI.
  • RI information hereinafter referred to as RI information
  • first PMI index information hereinafter referred to as first PMI index information
  • second codebook index PMI2 hereinafter, the second PMI index information
  • CQI information CQI information
  • the codebook indicated by PMI2 is set to be a compressed codebook (for example, a valid codeword can be selected to construct a subcodebook), so that a large amount of overhead can be reduced when the PMI2 is fed back.
  • a subcodebook used for some transmission modes in the PUSCH or the PUCCH may be constructed based on the codebook in the LTE-A, thereby reducing the feedback PMI2.
  • the minimum granularity indicated by ⁇ 2 may be different from the minimum granularity indicated by CQI.
  • ⁇ 2 and CQI do not need to maintain the same feedback granularity, and the feedback is more flexible, so that it is not necessary to feed back ⁇ 2 and CQI for each sub-band, thereby further reducing the overhead of feedback.
  • the total codebook is the equivalent single codebook form of the codebook.
  • ⁇ 2 is used to indicate a codeword in the codebook C praOT (r), wherein the codebook C praOT (r) is the one corresponding to the PMI1 in the codebook C (r) corresponding to the RI of the total codebook
  • the partial codewords in the set of group codewords are composed.
  • the number of codewords included in the codebook C praOT (r) may be 1/2 or 1/4 of the number of codewords included in the codebook C (r), of course, only By dividing the partial codewords into C PUSCH (r), the indication value of PMI2 can be reduced, thereby reducing the overhead used to deliver PMI2.
  • a PMI index information is composed of a part of codewords in a set of codewords.
  • ⁇ is a matrix that requires values determined by m and n, m, n are integers, and m, n is related to the first index ⁇ and the second index 2 that require feedback.
  • C praCT? (r).
  • any four codewords are selected from the codeword matrix with an index of 0 ⁇ 7 in the above table, and four codewords are selected from the codeword matrix with an index of 8-15 in the above table.
  • the optional four codewords in the codeword matrix of 5, 7, 9, 11, 13, 15 together form C praCTi (r).
  • select 4 codewords in the codeword matrix with Index 0, 1, 4, 5, 8, 9, 12, 13 from the above table, Index is 2, 3, 6, 7, 10, 11
  • C praCT? it may be that any two codewords are selected from the codeword matrix with an index of 0 ⁇ 7 in the above table, and two codewords are selected from the codeword matrix with an index of 8-15 in the above table.
  • C pracff (r) it may be that any two codewords are selected from the codeword matrix with an index of 0 ⁇ 3 in the above table, and two codewords are selected from the codeword matrix with an index of 4-7 in the above table.
  • C PUSCH (r ) can be as shown in Table 5 below: That is, 0 ⁇ (r) is 8 code words whose indices are 0, 3, 4, 7, 8, 11, 12, 15 in C(r). It is also possible that CH (r ) is the other 8 code words remaining in C(r). For example, CH (r ) can be as shown in Table 6 below: Table 6
  • C H (r) is 8 code words whose index is 0 - 7 in C(r).
  • it can also be ⁇
  • C pracff (r) can be as shown in Table 7 below: Table 7
  • C PraOT ( ⁇ is 8 codewords whose index is 0, 1, 4, 5, 8, 9, 12, 13 in C(r), and can also be CH (r ) as the remaining in C(r) The other 8 code words.
  • C pracff (r) can be as shown in Table 8 below: Table 8
  • C P (r ) can also be C(r). The remaining 8 codewords in the rest.
  • C pracff (r) can be as shown in Table 9 below: Table 9
  • C PraCT? W is 4 code words whose index is 0, 2, 4, 6 in C(r). Or 0 ⁇ (r) can also be as shown in Table 10 below: Table 10
  • 0 ⁇ is 4 code words whose index is 0, 1, 4, 5 in C(r).
  • 0 ⁇ (r) can be as shown in Table 11 below: Table 11
  • (: praOT (r) is 4 code words whose index is 0, 3, 4, 7 in C(r).
  • the numbering rule of 2 corresponding code words can be performed without changing the essence of the codebook.
  • the embodiment of the change, extraction example description is mainly based on the feature extraction of the codeword instead of the number feature extraction.
  • (r C praeff (r) complete codeword for arbitrary column exchange, multiplication by constant coefficient or all codewords common
  • the codebook formed after the transformation of the row exchange is equivalent to the codebook before the transformation.
  • each subband feedback saves lbit overhead, it can be from the 16 code words of C(r) above Select 8 code words to form C praCT? (r). Preferably, it can be selected from the code matrix of Index 0 ⁇ 3 in the above table, and the index is 4 ⁇ 7 from the above table.
  • the codewords together form 0 ⁇ (/).
  • C praCT? (r)
  • it may be any one of the codewords in the codeword matrix whose index is 0 ⁇ 3 in the above table, and one of the codeword matrices with the index of 4-7 in the above table, In the above table, any codeword in the codeword matrix with an index of 8 ⁇ 11 is selected. From the code matrix of the index of 12 ⁇ 15 in the above table, any one of the codewords is selected to form C praCT? (r;) . Can be as shown in Table 13 below:
  • v CH (r) is the other 8 code words remaining in C(r).
  • 0 ⁇ (r) is 8 code words with index 0, 2, 5, 7, 8, 10, 13, 15 in C(r).
  • v CH (r) can also be left in C(r) The other 8 code words.
  • 0 ⁇ (r) is 8 code words with index 0, 2, 4, 6, 8, 10, 12, 14 in C(r), or v CH (r) The other 8 codewords remaining in C(r).
  • the index is 4 code words of 2, 6, 10, 14 in C(r).
  • the f-numbering rule can be changed without changing the essence of the codebook.
  • the implementation method of extracting the instance description is mainly based on the feature extraction of the codeword instead of the numbering feature extraction.
  • the codebook formed by the conversion of (r C praeff (r) completion codeword by arbitrary column exchange, multiplication by constant coefficient or all codewords for row exchange is equivalent to the codebook before conversion. 3
  • Vm [l e ee J is a matrix that is determined by the value of ',', which is related to the first index i and the second index 2 that require feedback.
  • C PraOT for 4 code words of C(r) index 0, 2, 4, 6 or other 4 code words.
  • C PraOT for C(r) index of 0, 3, 4, 7 of 4 Codewords or other 4 codewords
  • C PraOT (4 codewords with index 0, 1, 4, 5 in C(r) or other 4 codewords.
  • Table 16 The double codebook equivalent single codebook C ( r ) of LTE-ARankl is shown in Table 16 below: Table 16
  • ⁇ is a matrix that requires values determined by m and ⁇ , m, n are integers, and m, n is related to the first index j and the second index 2 that require feedback.
  • C Pracff ( ⁇ is any index code of 0, 2, 4, 6, 8, 10, 12, 14 in C(r) and the index is 1, 3, 5, 7, 9, 11, 13 a codebook consisting of any four codewords in 15 . Further, it may be C praOT (for C(r), any two of the codewords with an index of 0, 4, 8, 12, and an index of 2, 6 Any two codewords of 10, 14 are indexed as any two codewords of 1, 5, 9, 13 and the index is a codebook consisting of any two of the 3, 7, 11, 15 codewords. It may also be a codebook composed of 8 code words indexed by IndexO, 1, 2, 3, 8, 9, 10, 11 in C(r), or a codebook composed of other 8 code words.
  • praOT (r) is a codebook composed of any four codewords in the index 0 to 7 in C(r) and any four codewords in the index 8 to 15. Further may be ( : praOT (r) is any codeword of 0 to 3 in C(r), any two codewords in index 4 ⁇ 7, index is any 2 codewords in 8 ⁇ 11 The index is a codebook composed of any two code words of 12 to 15.
  • the total codebook is in the form of a happy code.
  • PMI2 is used to indicate a codeword in the codebook C SOT (r), wherein the codebook C SOT (r) is represented by a partial codeword in the second codebook C 2 (r) corresponding to the RI of the total codebook Composition.
  • the codebook C SOT (r) is represented by a partial codeword in the second codebook C 2 (r) corresponding to the RI of the total codebook Composition.
  • the specific codeword is shown, and the number of codewords included in the codebook ( r ) may be 1/2 or 1/4 of the number of codewords included in the second codebook C 2 (r). Of course, only part of the codewords are selected.
  • C ⁇ OT (r) you can reduce the indication value of PMI2, thus reducing the overhead of passing PMI2.
  • Embodiment 5 The LTE-A Rank2 codebook can also be implemented by the following dual codebooks, represented as two codebooks C 1 (r) and C 2 (r), and PMI1 indicates one codeword in C», PMI2 A code word in C 2 (r) is indicated, and the two code words collectively represent channel information, such as a product function, by a prescribed function.
  • W1 corresponds to the codebook
  • r a i l ⁇ , is the number of columns of the matrix X w , b,. is a vector, such as a typical DFT vector (but not limited to this case), there are a total of N basic vectors b. ⁇ b N _ , further description is:
  • N te is a parameter related to the dimension of the vector, usually refers to the number of transmitting antennas.
  • ⁇ is an integer power of 2.
  • N te 8
  • N b 4
  • ⁇ 32
  • C 2 (r) (the codebook corresponding to W2) is composed of m code words, and Rank 2 contains:
  • the vector selected, when multiplied by the codeword in ( ⁇ ), can be understood as selecting the column in X w to construct the codeword in the codebook corresponding to W.
  • the codebook corresponding to w contains any codeword in the left multiplication
  • the codeword obtained by any codeword has m x X m 2 codewords, that is, the double codebook equivalent codebook in Embodiment 1.
  • the terminal The RI information r, the first PMI index information, the second PMI index information 2, and the ⁇ 1 information are fed back on the physical uplink shared channel.
  • Gêt(r) can be constructed according to the method of construction (: praOT (r) described in Embodiment 1. For the case of other ranks, the same method can also be used. It should be noted that although the above embodiments are The feedback on the physical uplink shared channel is taken as an example. However, the method is also applicable to feedback on the physical uplink control channel, and the subcodebook can use the above. FIG.
  • the terminal includes: a feedback module 22, configured to be shared in physical uplink.
  • Feedback channel state information on the channel or the physical uplink control channel where the channel state information includes: RI, a first codebook index PMI1, a second codebook index PMI2, and a CQI, where the PMI2 is used to indicate compression corresponding to the RI One codeword in the following codebook.
  • PMI2 is used to indicate one codeword in the codebook C PraOT (r), and the codebook C praOT (r) is from the total codebook Corresponding to the codebook C(r) of the RI, a partial codeword in a set of codewords corresponding to the PMI1 is formed.
  • the PMI2 is used to indicate a codebook (a codeword in puseH (), wherein the codebook C SOT (r) is corresponding to the RI of the total codebook
  • the second codebook C 2 (r) is formed by a partial codeword.
  • the embodiment further provides a method for feeding back channel information, including: the terminal feeding back channel state information on a physical uplink shared channel or a physical uplink control channel.
  • the channel state information includes: RI, a first codebook index PMI1, a second codebook index PMI2, and a CQI, where the minimum granularity indicated by the PMI2 is different from the minimum granularity indicated by the CQI.
  • the PMI2 and The CQI does not need to maintain the same feedback granularity, and the feedback is more flexible, so that it is not necessary to feed back PMI2 and CQI for each subband, thereby reducing the feedback overhead.
  • the minimum granularity indicated by PMI2 is the channel of N RBs.
  • the minimum granularity indicated by the CQI is channel information of M RBs, where N and M are positive integers and smaller than the maximum number of RBs in the current bandwidth, and N/M or M/N is an integer greater than 1.
  • the terminal is in physical Uplink shared channel or
  • the RP information r is fed back on the physical uplink control channel, and the first PMI index information, if there are thousands of second PMI index information 2 and thousands of CQI information, the number of PMI2 and the number of CQIs that the terminal specifically feeds back may be according to the minimum granularity indicated by each.
  • the present embodiment further provides a terminal, including: a feedback module 22, configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, where the channel state information includes: RI, a first codebook index PMI1, second codebook index PMI2 and CQI, the minimum granularity indicated by the PMI2 is different from the minimum granularity indicated by the CQI.
  • a feedback module 22 configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, where the channel state information includes: RI, a first codebook index PMI1, second codebook index PMI2 and CQI, the minimum granularity indicated by the PMI2 is different from the minimum granularity indicated by the CQI.
  • the feedback method using different feedback granularity for CQI and PMI is described by Embodiment 6-7 below.
  • FIG. 3 is a schematic diagram of a method for feeding back channel information according to Embodiment 6, as shown in FIG.
  • FIG. 4 is a schematic diagram of a method for feeding back channel information according to Embodiment 7. As shown in FIG. 4, CQI is fed back for each Subband, and PMI2 is fed back for 2 Subbands, relative to each sub- The band feeds back a PMI and CQI, which saves overhead. In a scenario where the PMI does not change much, performance does not cause a significant drop.
  • the solution provided by the embodiment of the present invention can ensure that the MU-MIMO performance is supported on the PUSCH or the PUCCH with reasonable overhead.
  • the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and, although the logical order is shown in the flowchart, in some cases, The steps shown or described may be performed in an order different from that herein.
  • the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un terminal destinés à la rétroaction de l'information canal. Selon ce procédé, le terminal prend l'information d'état de canal et la remet en retour, à un canal physique partagé de liaisons montantes ou "PUSCH" (Physical Uplink Shared Channel), ou à un canal physique de commande de liaisons montantes ou "PUCCH" (Physical Uplink Control Channel). Ladite information d'état de canal comprend: un indicateur de rang ou "RI" (Rank Indicator), un premier indicateur de livre de code PMI1, un second indicateur de livre de code PMI2, et une indication de qualité du canal ou CQI (Channel Quality Indication). Si le livre de code total est sous forme d'un livre de code unique équivalant à un livre de code double, on se sert du PLI2 pour indiquer un mot de code d'un livre de code constitué de mots de code partiels d'un groupe de mots de code, correspondant au PMI, d'un livre de code correspondant au RI du livre de code total. Si le livre de code total est un livre de code double, on se sert du PLI2 pour indiquer un mot de code d'un livre de code constitué de mots de code partiels d'un second livre de code correspondant au RI du livre de code total. L'invention permet ainsi de réduire la charge de travail invisible de la rétroaction, et d'améliorer le rendement du système.
PCT/CN2011/076738 2010-09-30 2011-06-30 Procédé et terminal pour rétroaction d'information canal WO2012041102A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010504120.7A CN101958773B (zh) 2010-09-30 2010-09-30 反馈信道信息的方法及终端
CN201010504120.7 2010-09-30

Publications (1)

Publication Number Publication Date
WO2012041102A1 true WO2012041102A1 (fr) 2012-04-05

Family

ID=43485898

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/076738 WO2012041102A1 (fr) 2010-09-30 2011-06-30 Procédé et terminal pour rétroaction d'information canal

Country Status (2)

Country Link
CN (1) CN101958773B (fr)
WO (1) WO2012041102A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8644422B2 (en) * 2010-02-12 2014-02-04 Blackberry Limited Low overhead PMI and CQI feedback and pairing schemes for MU-MIMO
CN101958773B (zh) * 2010-09-30 2016-08-24 中兴通讯股份有限公司 反馈信道信息的方法及终端
CN102571301B (zh) * 2011-12-27 2014-07-09 东南大学 一种基于双码本的多用户自适应反馈方法
EP2930968B1 (fr) * 2012-12-09 2019-02-27 LG Electronics Inc. Procédé de réintroduction d'informations de statut de canal dans un système de communication sans fil accueillant des antennes multiples, et son appareil
CN103905100B (zh) * 2012-12-26 2019-02-19 中兴通讯股份有限公司 基于4天线码本的数据预编码处理方法及装置
WO2014109622A1 (fr) 2013-01-14 2014-07-17 엘지전자 주식회사 Procédé de rapport d'informations d'état de canal pour formation de faisceau tridimensionnel dans un système de communication sans fil et dispositif associé
US9281881B2 (en) * 2013-02-12 2016-03-08 Texas Instruments Incorporated 4TX codebook enhancement in LTE
CA2910459C (fr) * 2013-04-28 2018-07-17 Huawei Technologies Co., Ltd. Procede de retour d'information sur un indicateur de matrice de precodage, extremite receptrice et extremite emettrice
CN104243003B (zh) * 2013-06-06 2017-10-27 电信科学技术研究院 一种基于码本的信道状态信息的传输方法和装置
CN105515730B (zh) * 2014-09-22 2018-07-10 中兴通讯股份有限公司 信道信息的反馈方法、装置及系统
CN109150266A (zh) * 2017-06-16 2019-01-04 华为技术有限公司 信道状态信息的传输方法、接入网设备和终端设备
CN108847875B (zh) 2017-06-16 2019-10-22 华为技术有限公司 一种信道状态信息发送、接收方法及设备
CN109150270B (zh) 2017-06-28 2021-01-05 华为技术有限公司 信道状态信息反馈和接收方法、发送端设备和接收端设备
CN110958043B (zh) * 2018-09-27 2021-08-31 大唐移动通信设备有限公司 一种信道状态信息的反馈方法及装置、终端和基站
CN110754054B (zh) * 2019-05-12 2021-01-08 Oppo广东移动通信有限公司 一种信道状态信息传输方法、设备及存储介质
CN115053465B (zh) * 2020-02-07 2024-01-02 华为技术有限公司 一种信息传输方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009096708A1 (fr) * 2008-01-30 2009-08-06 Lg Electronics Inc. Procédé de transmission d'informations de précodage dans un système à plusieurs antennes
CN101615979A (zh) * 2008-06-24 2009-12-30 华为技术有限公司 多天线系统中的反馈指示方法、系统和设备
CN101820335A (zh) * 2010-05-07 2010-09-01 中兴通讯股份有限公司 一种使用二级码字反馈信道状态信息的终端及方法
CN101958773A (zh) * 2010-09-30 2011-01-26 中兴通讯股份有限公司 反馈信道信息的方法及终端

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101826941B (zh) * 2010-04-02 2015-12-16 中兴通讯股份有限公司 信道量化信息的反馈方法和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009096708A1 (fr) * 2008-01-30 2009-08-06 Lg Electronics Inc. Procédé de transmission d'informations de précodage dans un système à plusieurs antennes
CN101615979A (zh) * 2008-06-24 2009-12-30 华为技术有限公司 多天线系统中的反馈指示方法、系统和设备
CN101820335A (zh) * 2010-05-07 2010-09-01 中兴通讯股份有限公司 一种使用二级码字反馈信道状态信息的终端及方法
CN101958773A (zh) * 2010-09-30 2011-01-26 中兴通讯股份有限公司 反馈信道信息的方法及终端

Also Published As

Publication number Publication date
CN101958773B (zh) 2016-08-24
CN101958773A (zh) 2011-01-26

Similar Documents

Publication Publication Date Title
WO2012041102A1 (fr) Procédé et terminal pour rétroaction d'information canal
US11831379B2 (en) Method for feeding backchannel state information, user equipment, and base station
US9906279B2 (en) Precoding matrix indicator feedback method, receive end, and transmit end
US9408196B2 (en) Method and terminal for feeding back channel state information
US9014288B2 (en) Method and system for acquiring channel information
US8750404B2 (en) Codebook subsampling for PUCCH feedback
JP5427878B2 (ja) Ｍｉｍｏシステムでコードブックを用いてフィードバックを行うフィードバック方法
KR101352600B1 (ko) 채널상태정보 피드백 방법 및 단말
WO2012068880A1 (fr) Procédé et dispositif pour réinjecter des informations d'état de canal
US9136921B2 (en) Method for channel information feedback and a terminal
CN110830165B (zh) 信道状态信息反馈方法和终端
WO2012041107A1 (fr) Procédé et terminal pour retour d'information d'état de canal
WO2012022100A1 (fr) Procédé, dispositif et système destinés à configurer un livre de codes
WO2014179996A1 (fr) Procédé de retour d'information, équipement d'utilisateur et station de base
WO2011160453A1 (fr) Procédé de rétroaction pour informations d'état de canal

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11827998

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11827998

Country of ref document: EP

Kind code of ref document: A1