US20140362940A1 - Channel State Information (CSI) Feedback and Subsampling - Google Patents

Channel State Information (CSI) Feedback and Subsampling Download PDF

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US20140362940A1
US20140362940A1 US14/295,414 US201414295414A US2014362940A1 US 20140362940 A1 US20140362940 A1 US 20140362940A1 US 201414295414 A US201414295414 A US 201414295414A US 2014362940 A1 US2014362940 A1 US 2014362940A1
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Prior art keywords
pmi
codebook
rank
pmi1
bits
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US14/295,414
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Inventor
Guosen Yue
Narayan Prasad
Sampath Rangarajan
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NEC Laboratories America Inc
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NEC Laboratories America Inc
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Priority to US14/295,414 priority Critical patent/US20140362940A1/en
Assigned to NEC LABORATORIES AMERICA, INC. reassignment NEC LABORATORIES AMERICA, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PRASAD, NARAYAN, RANGARAJAN, SAMPATH, YUE, GUOSEN
Priority to RU2016145415A priority patent/RU2637507C1/ru
Priority to KR1020147034768A priority patent/KR101553995B1/ko
Priority to EP14808175.5A priority patent/EP2875595A4/en
Priority to AU2014262186A priority patent/AU2014262186B2/en
Priority to PCT/US2014/040977 priority patent/WO2014197643A1/en
Priority to KR1020157012850A priority patent/KR101553996B1/ko
Priority to JP2015517504A priority patent/JP2015526945A/ja
Priority to RU2015102992A priority patent/RU2606400C2/ru
Publication of US20140362940A1 publication Critical patent/US20140362940A1/en
Priority to JP2016201886A priority patent/JP2017041906A/ja
Priority to RU2017140200A priority patent/RU2669205C1/ru
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • 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
    • H04B7/0417—Feedback 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
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    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
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    • 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
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    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
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    • H04B7/00—Radio transmission systems, i.e. using radiation field
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    • 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]
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    • H04B7/00—Radio transmission systems, i.e. using radiation field
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    • 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
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • 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
    • 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
    • H04B7/0658—Feedback reduction
    • 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
    • H04B7/0658—Feedback reduction
    • H04B7/066—Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
    • 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
    • H04B7/0697—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 spatial multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
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    • 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

Definitions

  • the present invention relates to the codebook for wireless or mobile communications systems and, more particularly, to feedback information for the codebook.
  • 3GPP Release 12 Rel. 12
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • Codebook solution 2a in [1] can be adopted as the enhanced 4Tx codebook for rank 1 and 2.
  • W1 is an identity matrix and W2 uses Release 8 4-Tx codeword (rank 3 and 4).
  • Transmission rank (sometimes called “rank”) is the number of transmission layers (sometimes called “layers”).
  • a codebook is a set of codewords.
  • a codeword is also known as a precoder or precoding matrix.
  • An objective of the present invention is to provide a solution to transmit from a user equipment to a base station feedback information for the codebook.
  • An aspect of the present invention includes a method implemented in a base station used in a wireless communications system.
  • RI rank indication
  • PMI precoding matrix indicator
  • Another aspect of the present invention includes a method implemented in a user equipment used in a wireless communications system.
  • Still another aspect of the present invention includes a base station used in a wireless communications system.
  • Still another aspect of the present invention includes a user equipment used in a wireless communications system.
  • Still another aspect of the present invention includes a method implemented in a wireless communications system.
  • Still another aspect of the present invention includes a wireless communications system.
  • Still another aspect of the present invention includes a method implemented in a base station used in a wireless communications system.
  • Still another aspect o the present invention includes a method implemented in a user equipment used in a wireless communications system.
  • Still another aspect of the present invention includes a base station used in a wireless communications system.
  • Still another aspect of the present invention includes a user equipment used in a wireless communications system.
  • Still another aspect of the present invention includes a method implemented in a wireless communications system.
  • Still another aspect of the present invention includes a wireless communications system.
  • Still another aspect of the present invention includes a method implemented in a base station used in a wireless communications system.
  • rank indication RI
  • PMI precoding matrix indicator
  • codebook index i 2 codebook index
  • Still another aspect of the present invention includes a method implemented in a user equipment used in a wireless communications system.
  • rank indication RI
  • PMI precoding matrix indicator
  • codebook index i 2 codebook index
  • Still another aspect of the present invention includes a base station used in a wireless communications system.
  • rank indication RI
  • PMI precoding matrix indicator
  • codebook index i 2 codebook index
  • Still another aspect of the present invention includes a user equipment used in a wireless communications system.
  • rank indication RI
  • PMI precoding matrix indicator
  • codebook index i 2 codebook index
  • Still another aspect of the present invention includes a method implemented in a wireless communications system.
  • rank indication RI
  • PMI precoding matrix indicator
  • codebook index i 2 codebook index
  • rank indication RI
  • PMI precoding matrix indicator
  • codebook index i 2 codebook index
  • FIG. 1 depicts W1 statistics for codebook 2a and 2b for rank 1 and 2 in cross-polarized (Xpol) antennas with 1 ⁇ 2- ⁇ antenna spacing.
  • FIG. 2 depicts W1 statistics for codebook 2a and 2b for rank 1 and 2 in cross-polarized (Xpol) antennas with 4- ⁇ antenna spacing.
  • FIG. 3 depicts W2 statistics for codebook 2a and 2b for 2 in cross-polarized (Xpol) antennas with 0.5- ⁇ antenna spacing.
  • FIG. 4 depicts W2 statistics for codebook 2a and 2b for 2 in cross-polarized (Xpol) antennas with 4- ⁇ antenna spacing
  • FIG. 5A depicts W2 statistics for codebook 2a and 2b for 2 in cross-polarized (Xpol) antennas with 0.5- ⁇ antenna spacing.
  • FIG. 5B depicts W2 statistics for codebook 2a and 2b for 2 in cross-polarized (Xpol) antennas with 4- ⁇ antenna spacing
  • FIG. 6 is a block diagram of a MIMO system.
  • e i denotes a 4 by 1 vector with the ith entry being 1 and zero for all other entries.
  • codebook 2a and 2b are rank-2 W2 entries. Among 16 entries of rank-2 W2 entries, they share 9 entries.
  • rank-2 W2 of i 2 0, . . . , 7 in solution 2a also appear in solution 2b, we adopt the same index i 2 for these 8 entries for rank-2 W2 in solution 2b.
  • W1 is identity matrix
  • W2 uses Release 8 codebook as in [2].
  • each codebook is 4-bit size.
  • the feedback overhead is too large if we send the full CSI feedbacks.
  • PUCCH CSI feedback mode 1-1 users are configured to report a RI, a wideband channel quality indicator (CQI, quantized SINR or signal-to-interference-plus-noise ratio) and a wideband precoding matrix indicator (PMI) to the network in a CSI process.
  • the feedback of rank indicator or rank indication (RI), CQI and PMI can be configured with different periodicity.
  • RI rank indicator
  • CQI and PMI can be configured with different periodicity.
  • two indexes corresponding to W1 and W2 are feedback. Since W1 captures the channel condition in a relatively long term and large bandwidth, the feedback of W1 index (first PMI) can be configured in a longer period than that of W2.
  • the feedback of RI and W1 is configured in the same periodicity.
  • the total number of entries for RI and W1 information is 34 (16 each for rank 1 and 2, 2 entries for rank 3 and 4, assuming agreed 4-bit W1 for 4-Tx codebooks).
  • subsampling is also required for the enhanced 4-Tx codebook.
  • Table 1.4 Based on subsampling scheme Alt II-b, and the W1 statistics in FIG. 1 and FIG. 2 , we form a codebook subsampting design solution shown in Table 1.4. Since for Alt II-b, we have total 1.4 entries for joint RI and the first PMIs for rank 1 and 2, we cannot have equally spaced W1s. Based on the statistics shown in FIGS. 1 , and 2 , we provide a solution in Table 1.4. Here we consider 7 entries for each rank. However, the number of entries can be different as the importance or statistics of rank 1 and rank 2 can be different. For example, for MU-MIMO pairing, it has been shown that paired user with rank-1 transmissions are better. Thus it would be better have more entries (less subsampling) for rank 1 than rank 2.
  • the report type (type-5 report [3]) shall be modified for 4 antenna ports when new codebook is configured.
  • the modified type 5 report is given in Tables 2.1-2.3 for alternative I, II-a, and II-b, respectively.
  • submode 2 of PUCCH CSI feedback mode 1-1 the user can be configured to report the CQI and complete preferred precoder information (first PMI for W1 and second PMI for W2).
  • total number of feedback bits would be 12 bits (4-bit CQI, 4-bit W1 and 4-bit W2) for rank 1 CSI feedback, 15 bits (two CQIs 7 bit+4-bit W1, 4-bit W2) for rank 2 feedback, or 11 bits (7 bits for two CQIs, 4 bits for W2) for rank 3 or rank 4 feedback.
  • currently maximum number of bits for each report is 11-bits.
  • codebook subsampling is needed for rank-1 and 2 feedback when PUCCH feedback mode 1-1 submode 2 is configured, while there is no need of codebook subsampling for rank-3 and 4.
  • rank-2 we select 16 entries for W1/W2. But for rank-1 since only one CQI is reported which uses 4 bits, we can subsample less for the rank-1 codewords to improve the performance.
  • rank-1 codewords One design example is given below in which uses total 7 bits.
  • the inner codebook (W1) For sub-sampling the inner codebook (W1) we can simply sub-sample the centers in a uniform manner. Note that the wideband codebook has the following 16 centers [0:15]/32.
  • rank-1 total payload size is 7 for W1/W2.
  • rank-1 W2 codebooks we only need to sub-sampling rank-1 W2 codebooks.
  • rank-1 outer codebooks are the same for codebooks 2a and 2b, we can consider either one of them in this procedure.
  • Certain other criteria can be used (or can be imposed on top of t aforementioned procedures) for sub-sampling.
  • the report type (type-2c report [3]) shall be modified for 4 antenna ports when new codebook is configured.
  • the modified type 2c report is given in Tables 4.1A-4.2A far alternative III and IV, respectively.
  • submode 2 of PUCCH CSI feedback mode 1-1 the user can be configured to report the CQI and complete preferred precoder information (first PMI for W1 and second PMI for W2).
  • total number of feedback bits would be 12 bits (4-bit CQI, 4-bit W1 and 4-bit W2) for rank 1 CSI feedback, 15 bits (two CQIs 7 bit+4-bit W1, 4-bit W2) for rank 2 feedback, or 11 bits (7 bits for two CQIs, 4 bits for W2) for rank 3 or rank 4 feedback.
  • currently maximum number of bits for each report is 11-bits.
  • codebook subsampling is needed for rank-1 and 2 feedback when PUCCH feedback mode 1-1 submode 2 is configured, while there is no need of codebook subsampling for rank-3 and 4.
  • the inner codebook (W1) For sub-sampling the inner codebook (W1) we can simply sub-sample the centers in a uniform manner. Note that the wideband codebook has the following 16 centers [0:15]/32.
  • W2 For sub-sampling the outer codebook (W2), we can optionally enforce a criterion in the rank-2 case that at-least one outer codeword in the sub-sampled codebook enables selecting orthogonal beams from the inner codeword.
  • a criterion in the rank-2 case that at-least one outer codeword in the sub-sampled codebook enables selecting orthogonal beams from the inner codeword.
  • an example 1 bit rank-2 outer sub-sampled codebook is formed by (e2, e4) with the 2 co-phasing options corresponding to i2 in ⁇ 14, 15 ⁇ .
  • This choice of W2 can be used with subsampled W1 ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ or more preferably used with W1 indices ⁇ 0, 2, 4, 6, 8, 10, 12, 14 ⁇ for more balanced sampling.
  • rank 1 from the original codebooks, we can choose two of ⁇ (e 1 ), (e 2 ), (e 3 ) (e 4 ) ⁇ which select two orthogonal beams.
  • two rank-1 codewords with same W1 will be orthogonal.
  • ⁇ (e 1 ), (e 3 ) ⁇ we have
  • bit splitting i.e., allocate 2 bits for W1 subsampling and 2 bits for W2 subsampling.
  • bit splitting i.e., allocate 2 bits for W1 subsampling and 2 bits for W2 subsampling.
  • we can still cover beam space with a ulna beam spacing, just with a co-phasing term changed for every 4 codewords instead of 8.
  • total payload size is 7 for W1/W2.
  • the report type (type-2c report [3]) shall be modified for 4 antenna ports when new codebook is configured.
  • the modified type 2c report is given in Tables 4.1B-4.2B for alternative III and IV, respectively.
  • the user can be configured to report the preferred subband with the corresponding preferred PMI and CQI.
  • L bits are allocated to report user preferred subband index.
  • the use needs to report the CQI and second PMI (for W2).
  • the feedback payload size for CQI and second PMI is reduced.
  • maximum 9 bits are allocated for subband CQI/second PMI reporting.
  • Rank-3 The sub-sampling to select 4 out of 16 codewords can be done using either the Chordal distance or the Fubini-Study distance measure. Typically chordal distance is more suitable for lower SNRs whereas Fubini-Study is good at larger SNRs.
  • each codeword is a 4x4 unitary matrix so the distance eh -r Chordal distance or Fubini-Study) among any two pair of codewords is zero.
  • a. convenient way for sub-sampling is to re-use the indices obtained for the rank-3 case in the rank-4 legacy codebook, to obtain a sub-sampled rank-4 codebook.
  • each one of the 1820 choices we can consider each one of the 16 inner codewords and determine the Q distances (where Q is the number of pairs in the sub-sampled outer codebook and is 6 in this example) and then associate the minimum among the Q distances with that inner codeword for that choice. Then, the 16 associated distances (with the 16 inner codewords for that choice) can be combined in a suitable manner into one metric associated with that choice a suitable way can be a product of the distances or their geometric mean with some regularization etc.). The one or more choices whose metric s are equal to the maximum (or are within a margin of the maximum) can be determined to be suitable candidates.
  • Chordal distance and Fubini Study distance are more suitable to uncorrelated channels (such as those seen with wide antenna spacing).
  • the user can be configured to report the preferred subband with the corresponding preferred PMI and CQI.
  • L bits are allocated to report user preferred subband index.
  • the use needs to report the CQI and second PMI (for W2).
  • the feedback payload size for CQI and second PMI is reduced.
  • maximum 9 bits are allocated for subband CQI/second PMI reporting.
  • Rank-3 The sub-sampling to select 4 out of 16 codewords can be done using either the Chordal distance or the Fubini-Study distance measure, Typically chordal distance is more suitable for lower SNRs whereas Fubini-Study is good at larger SNRs.
  • each codeword is a 4 ⁇ 4 unitary matrix so the distance (either Chordal distance or Fubini-Study) among any two pair of codewords is zero.
  • a convenient way for sub-sampling is to re-use the indices obtained for the rank-3 case in the rank-4 legacy codebook, to obtain a sub-sampled rank-4 codebook.
  • each one of the 1820 choices we can consider each one of the 16 inner codewords and determine the Q distances (where Q is the number of pairs in the sub-sampled outer codebook and is 6 in this example) and then associate the minimum among the Q distances with that inner codeword for that choice. Then, the 16 associated distances (with the 16 inner codewords for that choice) can be combined in a suitable manner into one metric associated with that choice (a suitable way can be a product of the distances or their geometric mean with some regularization etc.). The one or more choices whose metric s are equal to the maximum (or are within a margin of the maximum) can be determined to be suitable candidates.
  • Chordal distance and Fubini Study distance are more suitable to uncorrelated channels (such as those seen with wide antenna spacing).
  • This beam selection scheme can still cover all 32 beams but avoid the codeword redundancy. In addition, it will be benefit to have one more co-phasing term.
  • An analogous selection is (Y 1 , Y 2 ) ⁇ (e 2 , e 2 ), (e 4 , e 4 ) ⁇ with both co-phasing terms,
  • a multiple input multiple output (MIMO) system 100 in which the embodiments may be implemented is illustrated.
  • UEs user equipments
  • BS base station
  • Each of user equipments 102 includes e.g. a transmitter, and base station 104 includes e.g. a receiver.
US14/295,414 2013-06-07 2014-06-04 Channel State Information (CSI) Feedback and Subsampling Abandoned US20140362940A1 (en)

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US14/295,414 US20140362940A1 (en) 2013-06-07 2014-06-04 Channel State Information (CSI) Feedback and Subsampling
RU2015102992A RU2606400C2 (ru) 2013-06-07 2014-06-05 Передача по обратной связи информации состояния канала (csi) и субдискретизация кодировочной книги
AU2014262186A AU2014262186B2 (en) 2013-06-07 2014-06-05 Channel state information (CSI) feedback and codebook subsampling
KR1020147034768A KR101553995B1 (ko) 2013-06-07 2014-06-05 채널 상태 정보(csi) 피드백 및 코드북 서브샘플링
EP14808175.5A EP2875595A4 (en) 2013-06-07 2014-06-05 FEEDBACK CHANNEL STATUS INFORMATION AND CODE BOOK SUB-SCAN
RU2016145415A RU2637507C1 (ru) 2013-06-07 2014-06-05 Передача по обратной связи информации состояния канала (csi) и субдискретизация кодировочной книги
PCT/US2014/040977 WO2014197643A1 (en) 2013-06-07 2014-06-05 Channel state information (csi) feedback and codebook subsampling
KR1020157012850A KR101553996B1 (ko) 2013-06-07 2014-06-05 채널 상태 정보(csi) 피드백 및 코드북 서브샘플링
JP2015517504A JP2015526945A (ja) 2013-06-07 2014-06-05 チャネル状態情報（ｃｓｉ）フィードバックおよびコードブックサブサンプリング
JP2016201886A JP2017041906A (ja) 2013-06-07 2016-10-13 チャネル状態情報（ｃｓｉ）フィードバックおよびコードブックサブサンプリング
RU2017140200A RU2669205C1 (ru) 2013-06-07 2017-11-20 Передача по обратной связи информации состояния канала (csi) и субдискретизация кодировочной книги

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017030429A1 (ko) * 2015-08-20 2017-02-23 삼성전자 주식회사 무선 통신 시스템에서 채널 상태 정보 피드백 방법 및 장치
US20170085304A1 (en) * 2014-05-07 2017-03-23 Zte Corporation Information feedback method, terminal, base station, communication system and storage medium
US9800312B2 (en) * 2013-05-24 2017-10-24 Xi'an Zhongxing New Software Co., Ltd. Method and terminal for feeding back channel state information
US10694496B2 (en) 2014-11-07 2020-06-23 Samsung Electronics Co., Ltd. Method and apparatus for transmitting group message to user equipment (UE)
US10868597B2 (en) 2013-06-05 2020-12-15 Lg Electronics Inc. Method and apparatus for transmitting channel state information in wireless communication system

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140362940A1 (en) * 2013-06-07 2014-12-11 Nec Laboratories America, Inc. Channel State Information (CSI) Feedback and Subsampling
CN107359916B (zh) * 2015-05-15 2020-12-01 索尼公司 无线通信系统中的装置和方法
WO2017034169A1 (ko) * 2015-08-23 2017-03-02 엘지전자 주식회사 무선 통신 시스템에서 코드북을 이용한 동기 신호 전송 방법
CN106685496A (zh) * 2015-11-06 2017-05-17 北京信威通信技术股份有限公司 一种多输入输出系统中反馈信道状态信息的方法
CN107181514B (zh) 2016-03-11 2020-09-15 电信科学技术研究院 一种csi反馈方法、预编码方法及装置
KR102015650B1 (ko) 2016-09-26 2019-10-21 엘지전자 주식회사 무선 통신 시스템에서 채널 상태 정보 송수신 방법 및 이를 위한 장치
CN108023617B (zh) 2016-11-04 2023-06-27 华为技术有限公司 信道状态信息csi的反馈方法、接收方法、用户设备和网络设备
WO2018082459A1 (zh) * 2016-11-04 2018-05-11 华为技术有限公司 信息反馈方法、用户设备和网络设备
EP3579447B1 (en) * 2017-01-31 2021-12-15 LG Electronics Inc. Method for periodically transmitting uplink control information in wireless communication system and apparatus for same
KR102189161B1 (ko) * 2017-03-07 2020-12-09 삼성전자주식회사 다중 안테나 시스템에서의 피드백 장치 및 방법
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
CN109391407B (zh) * 2017-08-10 2020-06-23 电信科学技术研究院 一种信道状态信息csi反馈方法和资源分配方法及设备
US10819410B2 (en) * 2018-04-06 2020-10-27 Qualcomm Incorporated Selecting physical uplink control channel (PUCCH) resources for channel state information
CN112840697B (zh) * 2018-09-27 2024-01-23 上海诺基亚贝尔股份有限公司 关于csi开销减少的装置、方法和计算机程序

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130064276A1 (en) * 2010-04-02 2013-03-14 Lg Electronics Inc. User equipment apparatus and method for feeding back channel state information in a wireless communication system
WO2013067819A1 (zh) * 2011-11-10 2013-05-16 电信科学技术研究院 一种预编码矩阵指示pmi信息的传输方法及装置
US20140044083A1 (en) * 2011-04-26 2014-02-13 Lg Electronics Inc. Method for transmitting channel state information in wireless access system and terminal therefor
US20140328422A1 (en) * 2013-02-25 2014-11-06 Texas Instruments Incorporated Codebook Sub-Sampling for CSI Feedback on PUCCH for 4Tx MIMO

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2052468B1 (en) 2006-08-18 2015-09-16 QUALCOMM Incorporated Feedback of precoding control indication (pci) and channel quality indication (cqi) in a wireless communication system
US8236983B2 (en) * 2008-03-13 2012-08-07 Board Of Regents, The University Of Texas System Composition and method for the treatment of diseases affected by apoptosis
EP2797250B1 (en) 2007-04-20 2017-12-20 InterDigital Technology Corporation Method and apparatus for efficient precoding information validation for mimo communications
US8630184B2 (en) 2007-08-15 2014-01-14 Qualcomm Incorporated Uplink control channel format
US8045508B2 (en) 2008-02-14 2011-10-25 Lg Electronics Inc. Rank feedback method for multiple-input multiple-output transmission
US20110103510A1 (en) * 2009-04-23 2011-05-05 Qualcomm Incorporated Rank and precoding indication for mimo operation
US8526519B2 (en) 2009-12-14 2013-09-03 Texas Instruments Incorporated Multi-rank precoding matrix indicator (PMI) feedback in a multiple-input multiple-output (MIMO) system
KR101817724B1 (ko) * 2010-04-30 2018-02-21 삼성전자주식회사 각 리포팅 모드에 대응하는 코드북을 사용하는 다중 입출력 통신 시스템
CN102255703B (zh) 2010-05-19 2014-07-16 华为技术有限公司 一种预编码信息的发送和接收方法及装置
US8639198B2 (en) 2010-06-30 2014-01-28 Samsung Electronics Co., Ltd. Systems and methods for 8-TX codebook and feedback signaling in 3GPP wireless networks
US20120220286A1 (en) 2010-08-17 2012-08-30 Texas Instruments Incorporated Periodic Channel Quality Indicator on Physical Uplink Control Channel for Carrier Aggregation
WO2012024837A1 (en) 2010-08-26 2012-03-01 Huawei Technologies Co., Ltd. Method and system for precoding
US8693421B2 (en) 2010-09-02 2014-04-08 Texas Instruments Incorporated Downlink 8 TX codebook sub-sampling for CSI feedback
CN101944985B (zh) * 2010-09-20 2015-03-25 中兴通讯股份有限公司 一种信道状态信息反馈方法
KR101875609B1 (ko) 2010-09-26 2018-08-02 엘지전자 주식회사 다중 안테나 지원 무선 통신 시스템에서 효율적인 피드백 방법 및 장치
CN101969361B (zh) * 2010-09-30 2015-06-03 中兴通讯股份有限公司 传输周期反馈报告的方法和装置
ES2658265T3 (es) 2010-10-04 2018-03-09 Samsung Electronics Co., Ltd. Procedimiento y aparato de transmisión y recepción de mapa de bits de restricción de subconjunto de libro de códigos
JP2012100254A (ja) 2010-10-06 2012-05-24 Marvell World Trade Ltd Ｐｕｃｃｈフィードバックのためのコードブックサブサンプリング
US8687727B2 (en) 2010-11-05 2014-04-01 Intel Corporation Coordinated multi-point transmission using interference feedback
US9119101B2 (en) 2010-12-17 2015-08-25 Samsung Electronics Co., Ltd. Apparatus and method for periodic channel state reporting in a wireless network
US20130088978A1 (en) 2011-10-07 2013-04-11 Nokia Siemens Networks Oy Joint Encoding of Rank and CQI Feedback For Comp
US8953699B2 (en) 2011-11-07 2015-02-10 Google Technology Holdings LLC Method and apparatus for CSI feedback for joint processing schemes in an orthogonal frequency division multiplexing communication system with coordinated multi-point transmission
WO2013068916A1 (en) * 2011-11-07 2013-05-16 Marvell World Trade Ltd. Codebook sub-sampling for frequency-selective precoding feedback
JP5981253B2 (ja) * 2012-07-25 2016-08-31 東芝シュネデール・インバータ株式会社 インバータ装置
EP2993805B1 (en) * 2013-04-29 2018-03-21 LG Electronics Inc. Method and apparatus for transmitting channel state information in wireless communication system
US20140362940A1 (en) 2013-06-07 2014-12-11 Nec Laboratories America, Inc. Channel State Information (CSI) Feedback and Subsampling
KR102160008B1 (ko) * 2013-06-17 2020-09-25 삼성전자 주식회사 채널 상태 정보 송수신 방법 및 장치
US9270819B2 (en) * 2013-08-01 2016-02-23 Gable Baldridge Dialer detection and conversational traffic differentiation for the purpose of optimal call termination

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130064276A1 (en) * 2010-04-02 2013-03-14 Lg Electronics Inc. User equipment apparatus and method for feeding back channel state information in a wireless communication system
US20140044083A1 (en) * 2011-04-26 2014-02-13 Lg Electronics Inc. Method for transmitting channel state information in wireless access system and terminal therefor
WO2013067819A1 (zh) * 2011-11-10 2013-05-16 电信科学技术研究院 一种预编码矩阵指示pmi信息的传输方法及装置
US20140369436A1 (en) * 2011-11-10 2014-12-18 China Academy Of Telecommunications Technology Precoding matrix indicator (pmi) information transmission method and device
US20140328422A1 (en) * 2013-02-25 2014-11-06 Texas Instruments Incorporated Codebook Sub-Sampling for CSI Feedback on PUCCH for 4Tx MIMO

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9800312B2 (en) * 2013-05-24 2017-10-24 Xi'an Zhongxing New Software Co., Ltd. Method and terminal for feeding back channel state information
US10868597B2 (en) 2013-06-05 2020-12-15 Lg Electronics Inc. Method and apparatus for transmitting channel state information in wireless communication system
US10998950B2 (en) * 2013-06-05 2021-05-04 Lg Electronics Inc. Method and apparatus for transmitting channel state information in wireless communication system
US20170085304A1 (en) * 2014-05-07 2017-03-23 Zte Corporation Information feedback method, terminal, base station, communication system and storage medium
US10187129B2 (en) * 2014-05-07 2019-01-22 Zte Corporation Information feedback method, terminal, base station, communication system and storage medium
US10694496B2 (en) 2014-11-07 2020-06-23 Samsung Electronics Co., Ltd. Method and apparatus for transmitting group message to user equipment (UE)
US11477759B2 (en) 2014-11-07 2022-10-18 Samsung Electronics Co., Ltd. Method and apparatus for transmitting group message to user equipment(UE)
WO2017030429A1 (ko) * 2015-08-20 2017-02-23 삼성전자 주식회사 무선 통신 시스템에서 채널 상태 정보 피드백 방법 및 장치
US10361763B2 (en) 2015-08-20 2019-07-23 Samsung Electronics Co., Ltd. Channel state information feedback method and device in wireless communication system

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