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Method and apparatus for transmitting channel state information in wireless communication system

專利號
US10868597B2
公開日期
2020-12-15
申請人
LG ELECTRONICS INC.（KR Seoul）
發(fā)明人
Hyungtae Kim; Hanjun Park
IPC分類
H04B7/0456; H04B17/382; H04B7/06; H04L5/00; H04L1/00; H04B7/0417; H04W72/04; H04W72/06; H04W88/02
技術(shù)領(lǐng)域
cqi,codebook,w1,pmi,ri,ue,w2,in,csi,channel
地域： Seoul

摘要

A method for receiving channel state information (CSI) by a base station, includes transmitting configuration information indicating whether to use a 4 antenna ports codebook, wherein a first codebook index for a first precoding matrix indicator (PMI) and a second codebook index for a second PMI for a specific CSI report mode with 4 antenna ports are determined when the UE is configured to use the 4 antenna ports codebook; and receiving the CSI indicating the first codebook index and the second codebook index, wherein a value of the first codebook index is determined as follows: when a rank indicator (RI) is 1, the value of the first codebook index is determined based on a value of the first PMI multiplied by 4, and when the RI is 2, the value of the first codebook index is determined based on the value of the first PMI multiplied by 4.

說明書

A CSI reporting type may be set to one of various types. For example, a CSI reporting type defined in LTE release-10 will now be described. Type 1 reporting supports CQI feedback for UE selection sub-bands. Type 1a reporting supports subband CQI and second PMI feedback. Type 2, Type 2b, and Type 2c reporting supports wideband CQI and PMI feedback. Type 2a reporting supports wideband PMI feedback. Type 3 reporting supports RI feedback. Type 4 reporting supports wideband CQI. Type 5 reporting supports RI and wideband PMI feedback. Type 6 reporting supports RI and PTI feedback.

4Tx Codebook

4 Tx codebook may be represented by multiplication of two matrices as follows.
W=W1·W2??[Equation 12]

Here, the inner precoder W1 and the outer precoder W2 may represent wideband/long-term channel properties and subband/short-term channel properties, respectively. w1 may be set as follows.

W 1 = [ X n 0 0 X n ] ,

權(quán)利要求

1
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