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Device and method for transmitting channel quality information

A channel quality information and channel information technology, applied in the field of channel quality information transmission devices, can solve the problems of inability to reflect channel information, unfavorable feedback data volume compression, difficulty in determining quantization accuracy, etc., so as to reduce feedback overhead and facilitate the the effect of compression

Inactive Publication Date: 2010-12-29
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

H=ρh has a large value range, for example, large-scale fading ρ ranges from 10 -9 to 10 -13 No, if H is the quantization object, it is likely to quantize the small-scale fading information to 0, so it is not conducive to the compression of the feedback data volume, and it is also not conducive to the optimal design of the feedback granularity and feedback cycle during feedback.
For example, the number A=11.2 and the number B=0.02. If the number A=1 and the number B=0 in steps of 10, it cannot reflect the real channel information, and it is difficult to determine the quantization accuracy during quantization.

Method used

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  • Device and method for transmitting channel quality information
  • Device and method for transmitting channel quality information
  • Device and method for transmitting channel quality information

Examples

Experimental program
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Effect test

no. 1 example

[0045] When the UE feeds back direct channel information, the direct channel information is divided into two parts: coarse-grained channel information and fine-grained channel information.

[0046]The coarse-grained channel information belongs to the large-scale fading information of the channel, which is the normalized information of the obtained direct channel information, and can be the amplitude mean value of the channel or the amplitude mean value after energy normalization. In this embodiment, the channel amplitude mean value is selected as Coarse-grained channel information, of course, in other embodiments, other normalization methods may also be used according to the needs of the UE.

[0047] The feedback granularity of the coarse-grained channel information is full bandwidth and subband, the feedback period of the large-scale fading information of the full bandwidth is a multiple of the frame, and the feedback period of the large-scale fading information of the subband...

no. 2 example

[0060] When the UE feeds back direct channel information, the direct channel information is divided into two parts: coarse-grained channel information and fine-grained channel information.

[0061] The coarse-grained channel information is obtained channel quality information (hereinafter referred to as CQI) of the direct channel information. The feedback granularity of the coarse-grained channel information is full bandwidth and subband, the feedback period of the large-scale fading information of the full bandwidth is a multiple of the frame, and the feedback period of the large-scale fading information of the subband is a multiple of the subframe.

[0062] The specific calculation method of coarse-grained channel information is similar to the existing calculation method. The signal-to-interference-noise ratio (SINR) is calculated for the obtained direct channel information, and then obtained by exponentially effective SIR mapping (EESM) (where SIR represents the signal-to-in...

no. 3 example

[0071] When the UE feeds back direct channel information, the direct channel information is divided into two parts: coarse-grained channel information and fine-grained channel information.

[0072] The coarse-grained channel information belongs to the 2-norm normalized information of the channel, and the fine-grained channel information belongs to the normalized information of the channel matrix or the channel covariance matrix. The fine-grained channel information can be sub-band or full-bandwidth, and the feedback period of the fine-grained channel information is a multiple of a subframe.

[0073] The specific normalization process of the channel matrix is:

[0074] A = | | H | | F 2 = Σ i = 1 I Σ j = ...

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Abstract

The invention discloses a device and a method for transmitting channel quality information in order to reduce the feedback expenditure and improve the feedback accuracy when a terminal feeds back quality information to a base station. The method comprises the step of dividing direct channel information acquired by a mobile terminal into slowly changing rough-granularity channel information and quickly changing fine-granularity channel information, wherein the feedback granularity of the rough-granularity channel information is full bandwidth and sub-band, and the feedback cycle of the sub-band is a multiple of a sub-frame; and the feedback granularity of the fine-granularity channel information is sub-band or full bandwidth, and the feedback cycle is a multiple of the sub-frame. The feedback information of the invention can track the change of the channel well and is favorable for the reduction in the feedback expenditure.

Description

technical field [0001] The present invention relates to a long-term evolution (LTE) system and an advanced long-term evolution (LTE Advanced) system, in particular to a device and method for sending channel quality information. Background technique [0002] In the LTE 57 meeting, feedback on coordinated multipoint transmission (COMP) for LTE-A resulted in the following conclusions: [0003] ■Explicit channel state / statistical information feedback [0004] ○Channel as observed by the receiver, without assuming any [0005] transmission or receiver processing [0006] That is, the mobile terminal (UE) feeds back the received channel information without performing any sending or receiving processing. The direct channel information fed back includes: channel covariance matrix Ri, channel matrix Hi and main eigenvalues ​​or eigenvectors. However, since these direct channel information are channel information H after experiencing large-scale fading, H=ρh, where ρ is...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/06H04L1/16H04W28/06
CPCH04W72/0413H04W72/21
Inventor 姜静张晨晨朱常青
Owner ZTE CORP