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A CSI feedback method, terminal and network side device

A technology for network side equipment and terminals, applied in the field of communication, can solve the problem of high overhead of codebook feedback, and achieve the effect of reducing overhead

Active Publication Date: 2021-05-25
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Embodiments of the present invention provide a CSI feedback method, a terminal, and a network-side device to solve the problem of relatively large codebook feedback overhead

Method used

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  • A CSI feedback method, terminal and network side device
  • A CSI feedback method, terminal and network side device
  • A CSI feedback method, terminal and network side device

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0227] As an optional implementation manner, the CSI also includes:

[0228] Layer indication information, wherein the layer indication information is used to indicate relevant information of at least one of the first type of transport layer and the second type of transport layer.

[0229]The type of the layer indication message is not limited here, for example, the layer indication message may be in the form of a 4-bit bitmap (bitmap). If there are four transport layers, namely layer 0, layer 1, layer 2, and layer 3, and the content of the layer indication message is '1100', it means that layer 0 and layer 1 are the first type of transport layer, and layer 2 and layer 3 is the second type of transport layer.

[0230] It should be noted that the network-side device receives the layer indication information and beam index information sent by the terminal, so as to determine the precoding used by the network-side device. Specifically, since the precoding used by the network-si...

Embodiment 1

[0283] 1. The base station configures the terminal to use L1=4 beams for the first type of transmission layer, and L2=2 beams for the second type of transmission layer.

[0284] 2. The terminal determines the rank RI=4 according to the measured channel characteristics, that is, the number of transmission layers is 4, represented as layers 0-3. The terminal determines that layer 0 and layer 1 belong to the first type of transmission layer, and layer 2 and layer 3 belong to the second type of transmission layer. The way to determine the transmission layer can be obtained by performing singular value decomposition on the channel matrix.

[0285] 3. The terminal determines L1=4 beams used by layer 0, L1=4 beams used by layer 1, L2=2 beams used by layer 2, and L2=2 beams used by layer 3.

[0286] 4. The terminal feeds back 2 sets of beam indices used by the first type of transport layer (each set includes indices of L1=4 beams), and 2 sets of beam indices used by the second type o...

Embodiment 2

[0290] The system predefines a set of beam indexes used by the first type of transmission layer for multiple transmission layers (that is, each layer belonging to the first type of transmission layer uses the same L1 beams for linear combination), and a set of second type of transmission layer uses The beam index of is used for multiple transmission layers, and L2≥2 (that is, each layer belonging to the second type of transmission layer uses the same L2 beams for linear combination).

[0291] 1. The base station configures the terminal to use L1=4 beams for the first type of transmission layer, and L2=2 beams for the second type of transmission layer.

[0292] 2. The terminal determines rank=4 according to the measured channel characteristics, that is, the number of transmission layers is 4, represented as layers 0-3. The terminal determines that layer 0 and layer 1 belong to the first type of transmission layer, and layer 2 and layer 3 belong to the second type of transmissio...

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Abstract

Embodiments of the present invention provide a CSI feedback method, a terminal, and a network side device. The method includes: the terminal determines beams of multiple transmission layers, wherein the multiple transmission layers include transmission layers using different numbers of beams; the terminal sends CSI to the network side device, and the CSI includes beam index information, wherein , the beam index information is used to indicate that each transport layer uses a beam. The embodiments of the present invention can reduce codebook feedback overhead.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular to a channel state information (Channel State Information, CSI) feedback method, a terminal and a network side device. Background technique [0002] Versions defined in the New Radio (New Radio, NR) system include a Type I codebook (Type I) and a Type II codebook (Type II). Among them, the Type I codebook is based on beam selection and phase adjustment, its feedback overhead is small, and the quantization accuracy of the channel is low, while the Type II codebook is based on the linear combination of beams, its feedback overhead is large, and it has high channel quantization accuracy . In addition, in the current beam-based linear combination of the Type II codebook, each transmission layer uses the same L beams for linear combination, that is, the number of beams and beams used by each transmission layer are the same, which leads to the feedback of the codeboo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0408H04B7/06H04L5/00
CPCH04B7/0408H04B7/0626H04L5/0053
Inventor 李辉高秋彬陈润华
Owner DATANG MOBILE COMM EQUIP CO LTD