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Feedback method and device for precoding matrix indicator (PMI)

A technology of precoding matrix and feedback device, which is applied in the field of feedback method and device indicated by precoding matrix, can solve the problems of occupying terminal chip computing resources, PMI_i2 is meaningless, etc., so as to improve robustness, avoid invalid calculation, and reduce calculation effect of complexity

Active Publication Date: 2017-10-24
MORNINGCORE TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Then when the subsequent PMI_i2 is reported after reporting PMI_i1_0, once PMI_i1 changes (that is, it is no longer PMI_i1_0 but PMI_i1_1 for example), the PMI_i2 calculated based on PMI_i1_1 and subsequently reported is meaningless, and the calculation of PMI_i2 also takes up valuable resources of the terminal chip. computing resources

Method used

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  • Feedback method and device for precoding matrix indicator (PMI)
  • Feedback method and device for precoding matrix indicator (PMI)
  • Feedback method and device for precoding matrix indicator (PMI)

Examples

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no. 1 example

[0037] figure 1 It is the first PMI calculation and reporting process in the first embodiment of the present invention. refer to figure 1 As shown, the feedback method of a precoding matrix indicating PMI in this embodiment first performs the first PMI calculation and reporting process, including the following steps:

[0038] In step 101, the periodic calculation and reporting process of the first PMI starts.

[0039] In step 102, the calculation of the first PMI is performed.

[0040] In this step, the terminal calls the digital signal processing unit to calculate the first PMI.

[0041] Steps 103-109 report the first PMI, which will be described below.

[0042] In step 103, the closing time of the periodic reporting of the first PMI arrives.

[0043] In step 104, it is judged whether the calculation of the first PMI is completed.

[0044] That is to say, step 104 judges whether the first PMI is obtained in time when the reported closing time arrives.

[0045]If the ca...

no. 2 example

[0061] image 3 It is the first PMI calculation and reporting process in the second embodiment of the present invention. refer to image 3 As shown, the feedback method of a precoding matrix indicating PMI in this embodiment first performs the first PMI calculation and reporting process, including the following steps:

[0062] In step 301, the periodic calculation and reporting process of the first PMI is started.

[0063] In step 302, the calculation of the first PMI is performed.

[0064] In this step, the terminal calls the digital signal processing unit to calculate the first PMI.

[0065] Steps 303-307 report the first PMI, which will be described below.

[0066] In step 303, the closing time of the periodical reporting of the first PMI arrives.

[0067] In step 304, it is determined whether the calculation of the first PMI is completed.

[0068] That is to say, step 304 judges whether the first PMI is obtained in time when the reported closing time arrives.

[006...

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Abstract

The invention provides a feedback method and a device for a precoding matrix indicator (PMI). The feedback method comprises the following steps: calculation of a first PMI is carried out; reporting of the first PMI is carried out, and when the first PMI can not be acquired timely, a time sequence problem existing in calculation of the first PMI is marked; whether to carry out calculation of a second PMI is decided according to whether the time sequence problem exists in the calculation of the first PMI, and when the time sequence problem exists in the calculation of the first PMI, the calculation of the second PMI is abandoned; and reporting of the second PMI is carried out.

Description

technical field [0001] The present invention mainly relates to the field of mobile communication, in particular to a method and device for feedbacking a precoding matrix indication in a wireless cellular communication system. Background technique [0002] In the LTE Rel-8 standard, the LTE system introduces a closed-loop precoding technology to improve spectrum efficiency. Closed-loop precoding first requires that both the base station and the user equipment (UE) store the same set of precoding matrices, which is called a codebook. After estimating the channel state information according to the common pilot frequency of the cell, the terminal selects a precoding matrix from the codebook according to certain criteria. The selection criteria may be based on maximizing mutual information, selecting based on maximizing output signal-to-interference-noise ratio, and so on. The terminal feeds back the index of the selected precoding matrix in the codebook to the base station thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
CPCH04B7/0639
Inventor 林立
Owner MORNINGCORE TECH CO LTD
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