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Channel state information feedback method and terminal

A channel state information and terminal technology, which is applied in the directions of signaling, digital transmission system, error prevention, etc., can solve the problems of system performance degradation and high overhead, and achieve the effect of improving performance and improving feedback accuracy

Inactive Publication Date: 2011-02-09
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0101] The main purpose of the present invention is to provide a channel state information feedback method and a terminal to solve the problem that the overhead of the channel state information feedback method in the above-mentioned related art is relatively large, resulting in a decrease in system performance

Method used

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  • Channel state information feedback method and terminal
  • Channel state information feedback method and terminal

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0125] This embodiment combines the above embodiments and preferred implementation modes, and this embodiment provides a channel state information feedback method, figure 2 is a flowchart of a channel state information feedback method according to a preferred embodiment of the present invention, such as figure 2 As shown, the method includes:

[0126] Step S202, UE determines channel quality indicator information CQI, precoding matrix indicator information PMI and rank indicator information RI according to channel information. Wherein, the PMI may include PMI1 and PMI2.

[0127] Step S204, the UE reports the channel state information to the base station on the PUSCH according to the downlink control signaling or the aperiodic channel information reporting trigger indication of the Random Access Response Grant.

[0128] Preferably, in step S204, the UE feeds back the channel state information to the base station on the physical uplink shared channel (PUSCH) according to a p...

Embodiment 2

[0134] During eight-antenna transmission, the feedback structure of PMI is dual codebook, dual PMI feedback or single codebook, dual PMI feedback, and channel state information includes channel quality indicator information CQI, precoding matrix indicator information PMI and rank indicator information RI . Wherein, due to the application of the eight-antenna enhancement technology, the PMI information includes the first type of precoding matrix indicator information PMI1 and the second type of precoding matrix indicator information PMI2. Specifically, in the PUSCH channel, aperiodic feedback, when the M subbands selected from the subband set S are non-continuous subbands, the channel state information feedback by the UE includes the following steps:

[0135] Step 1: Determine channel quality indicator information CQI, precoding matrix indicator information PMI1 and PMI2, and rank indicator information RI according to channel information.

[0136] Step 2: According to the down...

Embodiment 3

[0142] During four-antenna transmission, when the PMI feedback structure is a single codebook and single PMI structure, the channel state information includes channel quality indicator information CQI, precoding matrix indicator information PMI and rank indicator information RI. Specifically, in the PUSCH channel, aperiodic feedback, when the M subbands selected from the subband set S are non-continuous subbands, the channel state information feedback by the UE includes the following steps:

[0143] Step 1: Determine CQI, PMI and RI according to channel information;

[0144] Step 2: According to the downlink control signaling or the aperiodic channel information reporting trigger indication of the Random Access Response Grant, report the channel state information to the base station on the PUSCH.

[0145] Preferably, in step 2, the user terminal UE feeds back the channel state information to the base station on the physical uplink shared channel (PUSCH) according to the follow...

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Abstract

The invention discloses a channel state information feedback method and a terminal. The method comprises the following steps: the terminal acquires channel state information, wherein the channel state information comprises channel quality indicator (CQI) information, pre-coding matrix indicator (PMI) information and rank indicator (RI) information; in an eight-antenna system, the PMI comprises a first kind of pre-coding matrix indicators (PMI1) and a second kind of pre-coding matrix indicators (PMI2); in a four-antenna system, the PMI comprises single PMI; and the terminal feeds back the channel state information on a physical uplink shared channel (PUSCH) according to the preset feedback method. The invention improves the performance of a communication system.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a channel state information feedback method and a terminal. Background technique [0002] In a wireless communication system, the sending end and the receiving end use multiple antennas to obtain a higher rate by means of spatial multiplexing. Compared with the general spatial multiplexing method, an enhanced technology is that the receiving end feeds back the channel information to the sending end, and the sending end uses the transmit precoding technology according to the obtained channel information, which can greatly improve the transmission performance. For single user multiple input multiple output (SU-MIMO, Single User Multi-input Multi-output, single user multiple input multiple output), directly use the channel feature vector information for precoding; for multi-user MIMO (MU-MIMO) , more accurate channel information is needed to guide multi-user precoding. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06
CPCH04L1/0026H04L1/06
Inventor 陈艺戬徐前子李儒岳徐俊张峻峰
Owner ZTE CORP
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