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Channel state information transmission method, access network device and terminal device

A technology for channel state information and access network equipment, which is applied in the field of communication and can solve the problems of high feedback overhead of terminal equipment and waste of uplink resources.

Inactive Publication Date: 2019-01-04
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present application provides a channel state information transmission method, access network equipment, and terminal equipment to solve the problem that when the rank of the precoding matrix is ​​greater than 2 in the prior art, the feedback overhead of the terminal equipment is large, resulting in a great waste of uplink resources technical issues

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  • Channel state information transmission method, access network device and terminal device
  • Channel state information transmission method, access network device and terminal device
  • Channel state information transmission method, access network device and terminal device

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Embodiment approach

[0073] The terminal device side is preset with a first codebook, and the first codebook indicates W 1 The column vector and W 1The corresponding relationship between the indexes of the column vectors, the terminal device side is also preset with a second codebook, the second codebook indicates the corresponding relationship between multiple first matrices and the indexes of the first matrix, and the two corresponding relationships are It may be in any form (for example, a table form). It should be noted that the number of first matrices in the above codebook depends on the W matrix indicated by the terminal device to the access network device. 2 The number of elements of or the rank of W.

[0074] Therefore, when the terminal device determines W 1 and W 2 , the terminal device can determine the relationship with W according to the first codebook 1 The index of the closest matrix, which is taken as W 1 The first PMI is reported to the base station. When W 2 When the ran...

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Abstract

The invention provides a channel state information transmission method, an access network device and a terminal device. The method includes the following steps that: an access network device receiveschannel state information (CSI) reported by a terminal device, wherein the CSI contains a first pre-coding matrix indicator (PMI) and a second PMI; the access network device determines a pre-coding matrix Wd according to the first PMI, the second PMI and a preset codebook, wherein W satisfies an equation that W=W1*W2, wherein W1 is corresponding to the first PMI, W2 is corresponding to the secondPMI, and the second PMI indicates a part of the column vectors of W2 and an amplitude association relation between the part of the column vectors of W2 and the remaining column vectors of the W2, thenumber of the columns of the W being greater than two. With the method adopted, the overhead of the terminal device in feeding back the CSI can be effectively saved.

Description

technical field [0001] The present application relates to communication technology, in particular to a transmission method of channel state information, access network equipment and terminal equipment. Background technique [0002] In the Long Term Evolution (LTE for short) frequency division duplexing (FDD for short) system, the terminal device uses the reference signal sent by the network device to perform channel estimation to obtain the channel state information (Channel State Information, CSI for short), and feed back the CSI to the network equipment, for example, the terminal equipment will precoding matrix index (Precoding Matrix Index, PMI for short), rank index (RankIndex, RI for short) and channel quality index (Channel Quality Index, CQI for short) ) to the network device, and the network device selects a precoding matrix from the codebook agreed with the UE according to the index information, and then uses the precoding matrix to precode the downlink data to be s...

Claims

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Application Information

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IPC IPC(8): H04B7/0456H04B7/06H04B7/10
CPCH04B7/0456H04B7/0626H04B7/0639H04B7/10H04L1/06H04B7/063H04L5/0053
Inventor 张荻张瑞齐李雪茹
Owner HUAWEI TECH CO LTD