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

專利號(hào)
US10868597B2
公開日期
2020-12-15
申請(qǐng)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

Report 1 is transmitted in a subframe in which a subframe index satisfies (10*nf+floor(ns/2)?N offset, CQI-N offset, RI) mod (MRI*(J*K+1)*Nc)=0, and MRI is determined via high layer signaling. N offset, RI indicates a relative offset value for RI, and FIG. 12 illustrates the case of MRI=2 and N offset, RI=?1. According to N offset, RI=?1, transmission time points of Report 1 and Report 2 are not overlapped with each other. When a UE calculates R1, W1, and W2, RI, W1, and W2 are associated and calculated. For example, W1 and W2 are calculated according to RI, and W2 is calculated according to W1. When both Report 2 and Report 3 are reported subsequent to Report 1, an eNB may know final W from W1 and W2.

FIG. 13 is a diagram illustrating CSI feedback in submode 1 of mode 1-1 of FIG. 8.

When PUCCH feedback mode 1-1 uses a dual codebook, submode 1 and submode 2 are present. FIG. 13 illustrates submode 1. Wideband W2 and wideband CQI are set to offset 1 and periodicity 2 and RI and W1 are set to offset 0 and periodicity 16.

In the 8Tx codebook, as shown in Table 1 below, RI and W1 are joint-encoded in 5 bits and in this case, and W1 is subsampled as shown in Table 1 below in order to reduce the sizes of payloads of RI and W1 to report information with a low coding rate. Since RI is referred to by the remaining PMI and CQI, encoding needs to be performed with a low coding rate in order to prevent a decoding error in RI from occurring.

權(quán)利要求

1
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