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CSI reporting method, CSI receiving method, terminal and network side device

A technology for network side equipment and terminals, applied in the field of communication, can solve problems such as poor CSI feedback performance

Active Publication Date: 2020-11-13
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a CSI reporting method, a CSI receiving method, a terminal, and a network-side device to solve poor CSI feedback performance

Method used

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  • CSI reporting method, CSI receiving method, terminal and network side device
  • CSI reporting method, CSI receiving method, terminal and network side device
  • CSI reporting method, CSI receiving method, terminal and network side device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0223] According to the corresponding relationship between the number of PMI subbands predetermined by the system and the number of the second set of frequency-domain basis vectors, the terminal and the network-side device side can determine that the second set of frequency-domain basis vectors contains N3 frequency-domain basis vectors, and each frequency domain The domain basis vectors are of length N3. Expressed as:

[0224]

[0225] For each layer, the precoding matrix uses 2L beams, and the network-side device configures the terminal to use the first frequency-domain basis vector set for each layer to include M frequency-domain basis vectors. For the Type II codebook of Rank=2, the first layer of precoding (or codebook) is expressed as:

[0226]

[0227] The second layer of precoding (or codebook) is expressed as:

[0228]

[0229] Here, W 1 contains 2L beams, Contains 2L*M coefficients. W f,0 / W f,1 respectively denote the first set of frequency-domain bas...

Embodiment 2

[0236] According to the corresponding relationship between the number of PMI subbands predetermined by the system and the number of the second set of frequency-domain basis vectors, the terminal and the network-side device side can determine that the second set of frequency-domain basis vectors contains N3 frequency-domain basis vectors, and each frequency domain The domain basis vectors are of length N3. Expressed as:

[0237]

[0238] For each layer, the precoding matrix uses 2L beams, and the network-side device configures the terminal to use the first frequency-domain basis vector set for each layer to include M frequency-domain basis vectors. For the Type II codebook of Rank=2, the first layer of precoding is expressed as:

[0239]

[0240] The second layer precoding is expressed as:

[0241]

[0242] Here, W 1 contains 2L beams, Contains 2L*M coefficients. W f,0 / W f,1 respectively denote the first set of frequency-domain basis vectors of the first layer...

Embodiment 3

[0248] According to the corresponding relationship between the number of PMI subbands predetermined by the system and the number of the second set of frequency-domain basis vectors, the terminal and the network-side device side can determine that the second set of frequency-domain basis vectors contains N3 frequency-domain basis vectors, and each frequency domain The domain basis vectors are of length N3. Expressed as:

[0249]

[0250] For each layer, the precoding matrix uses 2L beams, and the network-side device configures the terminal to use the first frequency-domain basis vector set for each layer to include M frequency-domain basis vectors. For the Type II codebook of Rank=2, the first layer of precoding is expressed as:

[0251]

[0252] The second layer precoding is expressed as:

[0253]

[0254] Here, W 1 contains 2L beams, Contains 2L*M coefficients. W f,0 / W f,1 respectively denote the first set of frequency-domain basis vectors of the first layer...

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Abstract

Provided in embodiments of the present invention are a CSI reporting method, a CSI receiving method, a terminal and a network side device, the method comprising the steps that: a terminal determines afirst frequency domain base vector set of each transmission layer, and frequency domain base vectors in the first frequency domain base vector set of each transmission layer belong to a second frequency domain base vector set; and the terminal feeds back CSI, and the CSI comprises information of a first frequency domain base vector set of each transmission layer. The embodiments of the present invention can improve CSI feedback performance.

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) reporting method, a CSI receiving method, a terminal and a network side device. Background technique [0002] A new codebook is newly introduced in the communication system, for example: Type II (Type II) codebook, and a low-overhead codebook is further introduced, which is based on linear combination of orthogonal beams and sub-band coefficient compression to reduce the overhead of the codebook . For example: taking rank (rank)=1 as an example, for all subbands, the codebook can be expressed as: [0003] [0004] Among them, W 1 Orthogonally combined beams that can be included in , Indicates the post-compression coefficient, W f Represents a set of frequency-domain basis vectors, which contains M frequency-domain basis vectors. [0005] Since the codebook has been updated, the existing CSI...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
CPCH04B7/0626H04B7/0639
Inventor 李辉高秋彬刘正宣
Owner DATANG MOBILE COMM EQUIP CO LTD