Method and terminal for feeding back channel information

A technology for feedback channel and channel state information, which is applied in transmission path sub-channel allocation, wireless communication, signaling allocation, etc., can solve the problems of performance impact, high overhead, and feedback overhead affecting normal data service transmission, etc. Overhead reduction, the effect of reducing the overhead of feedback

Active Publication Date: 2016-08-24
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the feedback codebook accuracy and feedback granularity have been enhanced, the problem is that the overhead is very large and has a serious impact on performance.
Since the increase of feedback overhead will affect the transmission of normal data services, this is a problem that needs to be solved urgently in the prior art

Method used

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  • Method and terminal for feeding back channel information
  • Method and terminal for feeding back channel information
  • Method and terminal for feeding back channel information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The dual-codebook equivalent single-codebook C(r) of Rank2 of LTE-A is shown in Table 4 below:

[0061] Table 4

[0062]

[0063] where φ n = e jπn / 2 , v m =[1 e j2πm / 32 e j4πm / 32 e j6πm / 32 ] T .

[0064] is a matrix that needs to be determined by the values ​​of m and n, m and n are integers, and m and n are related to the first index i that needs to be fed back 1 and the second index i 2 related.

[0065] (1) Considering that each subband feedback saves 1 bit overhead, you can select 8 codewords from the 16 codewords of C(r) above to form C PUSCH (r).

[0066] Preferably, it may be that 4 codewords are selected from the codeword matrix whose Index is 0-7 in the above table, and 4 codewords are selected from the codeword matrix whose Index is 8-15 in the above table to form together C PUSCH (r).

[0067] Preferably, it can be that Index is 0, 2, 4, 6, 8, 10, 12, and 14 in the code word matrix from the above table, and Index is 1, 3 from the above t...

Embodiment 2

[0102] The double-codebook equivalent single-codebook C(r) of LTE-A Rank3 is shown in Table 12 below:

[0103] Table 12

[0104]

[0105] where φ n = e jπn / 2 , v m =[1 e j2πm / 32 e j4πm / 32 e j6πm / 32 ] T , is a matrix that needs to be determined by the values ​​of m, m', m", and these parameters are related to the first index i that needs to be fed back 1 and the second index i 2 related.

[0106] (1) Considering that each subband feedback saves 1 bit overhead, you can select 8 codewords from the 16 codewords of C(r) above to form C PUSCH (r).

[0107] Preferably, it may be that, from the above table, Index is 0 to 3 in the codeword matrix of 2 codewords, from the above table, Index is 4 to 7 in the codeword matrix of 2 codewords, from Choose 2 codewords from the codeword matrix with Index 8-11 in the above table, and choose 2 codewords from the codeword matrix with Index 12-15 in the above table to form C PUSCH (r)

[0108] (2) Considering that each subband ...

Embodiment 3

[0128] The double codebook equivalent single codebook C(r) of LTE-A Rank4 is shown in Table 15 below:

[0129] Table 15

[0130]

[0131] where φ n = e jπn / 2 , v m =[1 e j2πm / 32 e j4πm / 32 e j6πm / 32 ] T .

[0132] is a matrix that needs to be determined by the values ​​of m, m′, n, and these parameters are related to the first index i that needs to be fed back 1 and the second index i 2 related.

[0133] (1) Consider saving 1 bit overhead:

[0134] C PUSCH(r) is the 4 codewords whose indexes are 0, 2, 4, 6 or other 4 codewords in C(r).

[0135] C PUSCH (r) is the 4 codewords whose indexes are 0, 3, 4, 7 or other 4 codewords in C(r).

[0136] C PUSCH (r) is the 4 codewords whose indexes are 0, 1, 4, 5 or other 4 codewords in C(r).

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Abstract

A method and terminal for feeding back channel information are disclosed in the present invention. The method includes that the terminal feeds back channel state information on a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH), wherein the channel state information includes: a Rank Indicator (RI), a fist codebook indicator PMI1, a second codebook indicator PMI2 and a Channel Quality Indication (CQI), and under the circumstance that the total codebook is in the form of a single codebook which is equivalent to a bi-codebook, PMI2 is used for indicating a code word in a codebook, and the codebook consists of partial code words in a group of code words set corresponding to the PMI1 in a codebook, wherein the codebook is a codebook corresponding to the RI in the total codebook; under the circumstance that the total codebook is a bi-codebook, the PMI2 is used for indicating a code word in a codebook, wherein the codebook consists of partial code words in a second codebook corresponding to the RI in the total codebook. With the present invention, the feedback overhead is reduced and the system performance is improved.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a method and a terminal for feeding back channel information. Background technique [0002] In a wireless communication system, the sending end and the receiving end use multiple antennas to obtain a higher rate by means of spatial multiplexing. Compared with the general spatial multiplexing method, an enhanced technology is that the receiving end feeds back channel information to the sending end, and the sending end uses the transmission precoding technology to process the obtained channel information before transmitting, thus greatly improving the transmission performance. For single-user multiple-input multiple-output (Multi-input Multi-output, MIMO for short), channel feature vector information can be directly used for precoding; for multi-user MIMO, more accurate channel information is required. [0003] In the Long Term Evolution (referred to as LTE) plan, the feedback o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/18
CPCH04L1/0026H04B7/0478H04B7/0482H04B7/0486H04B7/0639H04L5/0057H04W24/08
Inventor 陈艺戬李儒岳李书鹏张峻峰
Owner ZTE CORP
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