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Quantitative CSI (Channel State Information) feedback method and terminal

A technology of channel state information and channel measurement pilot, which is applied in the channel information quantization feedback method and terminal field, and can solve problems affecting TDD system performance, errors, and lack of TDD feedback unified design considerations, etc.

Inactive Publication Date: 2017-05-17
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, for figure 2 and image 3 The new CSI measurement feedback framework shown mainly considers the FDD system, and lacks a unified design consideration for targeted TDD feedback
Thus affecting the performance of the TDD system (including feedback overhead and link adaptation)
In addition, TxD-based CQI feedback cannot be well applied in various scenarios; calculating CQI in the way of transmission diversity will bring errors in the conversion process, because the conversion is not based on a perfect linear relationship, in some scenarios this conversion Will bring about a more obvious performance loss

Method used

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  • Quantitative CSI (Channel State Information) feedback method and terminal
  • Quantitative CSI (Channel State Information) feedback method and terminal
  • Quantitative CSI (Channel State Information) feedback method and terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment provides a quantitative feedback method of channel state information CSI, such as Figure 4 shown, including:

[0045] Step 110, the terminal obtains the configuration information of the channel measurement pilot and the CSI feedback type sent by the base station, the configuration information of the channel measurement pilot includes the configuration information of K sets of pilots, K≥1;

[0046] In this step, the configuration information of the CSI feedback type includes: information indicating whether the precoding matrix index PMI is enabled or disabled. For example, for an FDD system, configure to enable the PMI; for a TDD system, configure to disable the PMI. But the present invention is not limited thereto.

[0047] The terminal may obtain the configuration information of the channel measurement pilot from the channel measurement pilot configuration signaling sent by the base station, and obtain the configuration information of the CSI feedbac...

example 1

[0077] This example describes the configuration information of the channel measurement pilot.

[0078] The base station sends configuration information of K sets of channel measurement pilots (CSI-RS) to the terminal, and the distribution of the configuration information may be through high-layer signaling. The base station sends the K sets of pilots at the resource positions indicated in the configuration information.

[0079] The base station can configure one or more sets of pilots to the terminal, including the cycle information of each set of pilots, sequence information, time-frequency resource position pattern in the subframe, subframe offset information, etc.; Image 6 As shown, a maximum of 5 8-port patterns #0, #1, #2, #3, #4, and #5 are supported in the same subframe. If you configure 4-port patterns, you can configure 10, and if you configure 2-port patterns, you can configure 20 where DMRS is a demodulation reference signal (De Modulation Reference Signal), and C...

example 2

[0084] This example illustrates how the terminal judges the CQI calculation method based on the value of K when the CSI feedback type configuration information indicates that PMI is not enabled.

[0085] The choice of CQI calculation method generally assumes a transmission technology that may be used in the downlink, and estimates the signal-to-interference-noise ratio after the data is sent through the channel to the receiver when the transmission technology is applied; and then based on the SINR Compared with judging the channel quality, such as selecting a corresponding CQI level. The selected CQI level should make the block error rate of the downlink data channel transmission block corresponding to the CQI not exceed 0.1 in the corresponding modulation and coding mode; as shown in the table below, each CQI sequence number corresponds to a modulation mode and code Rate.

[0086] Table 1: 4-bit CQI table

[0087]

[0088]

[0089] In this example, when K>1, the termi...

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Abstract

The invention relates to a quantitative CSI feedback method and a terminal. The terminal obtains configuration information of a channel measurement pilot frequency and the CSI feedback type sent by a base station, the configuration information of the channel measurement pilot frequency comprises K sets of pilot-frequency configuration information, and K>=1; and the terminal determines a quantitative CSI feedback method according to a value of K and the configuration information of the CSI feedback type, and quantitative CSI feedback is carried out according to the quantitative CSI feedback method. The terminal comprises a quantitative CSI feedback device, and the quantitative CSI feedback device comprises an information obtaining module and a quantitative feedback module. CSI feedback of FDD and TDD can be realized via unified configuration, and a CQI calculation method and CSI report content are determined according to the value of K.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a channel information quantization feedback method and a terminal in a multi-antenna system. 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, where MIMO means Multi-input Multi-output, multiple input multiple output), directly use the channel feature vector information for precoding; for multi-user MIMO (MU-MIMO) , requires more accurate channel information. The followi...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/0456
CPCH04B7/04H04B7/06H04B7/0626H04B7/0456H04B7/0632
Inventor 陈艺戬李儒岳徐俊王瑜新鲁照华吴昊肖华华蔡剑兴
Owner ZTE CORP
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