Method and device for updating channel quality indicator

A technology of channel quality indication and interference channel, applied in the field of updating channel quality indication, can solve the problems of inability to realize user scheduling, data retransmission, data transmission failure, etc.

Active Publication Date: 2013-05-08
NTT DOCOMO INC
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Problems solved by technology

However, since the CSI that the base station can learn from the UE is very limited, it is impossible to accurately update the CQI of the UE, that is, the base station often overestimates or underestimates the CQI of the UE, so that accurate user scheduling cannot be achieved
Especially when the CQI of the UE is overestimated, after user

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  • Method and device for updating channel quality indicator
  • Method and device for updating channel quality indicator
  • Method and device for updating channel quality indicator

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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] When the base station updates the channel quality indicator (CQI) according to the CSI fed back by the UE, the base station first performs inter-cell interference power estimation and signal power estimation on the UE based on the CSI fed back by a UE within its own coverage area and the precoding matrix of the coordinated cell , and then update the CQI of the UE according to the estimated inter-cell interference power and signal power corresponding to the UE. Since the CSI that the base station can learn from the UE is very limited, the base station estimates the interference received by th...

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Abstract

The invention provides a method and a device for updating a channel quality indicator. The method for updating the channel quality indicator mainly comprises the following steps: confirming an assessment valve of an inter-cell interference power corresponding to a user experience (UE) according to a channel state information (CSI) feedback by the UE and a precoding matrix of a collaborative cell, wherein the assessment valve of the inter-cell interference power corresponding to the UE is greater than or equal to a true valve of the inter-cell interference power corresponding to the UE; confirming a signal power corresponding to the UE according to the CSI feedback by the UE; carrying out channel quality indicator updating according to the assessment valve of the inter-cell interference power corresponding to the UE and the signal power corresponding to the UE; and carrying out user scheduling for the UE according to the updated channel quality indicator. According to the method for updating the channel quality indicator, phenomenon that the channel quality indicator of the UE is over estimated is effectively avoided, so that the block error rate in data transmission is greatly reduced.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a method and device for updating channel quality indicator (CQI). Background technique [0002] In coordinated multipoint (CoMP) transmission, for example, in coordinated multipoint-coordinated scheduling / coordinated beamforming (CoMP-CS / CB) transmission, the base station (eNB) will (CSI) updates the CQI, and then performs user scheduling according to the updated CQI. However, since the CSI that the base station can learn from the UE is very limited, it cannot accurately update the CQI of the UE, that is, the base station often overestimates or underestimates the CQI of the UE, so that accurate user scheduling cannot be achieved. Especially when the CQI of the UE is overestimated, after user scheduling is performed according to the overestimated CQI, the UE will use a higher modulation and coding scheme (MCS) for data transmission, which often causes data transmission...

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Application Information

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IPC IPC(8): H04L1/00H04L1/16
Inventor 郤伟佘小明陈岚
Owner NTT DOCOMO INC
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