Method and device for updating channel quality indicator

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...

AI Technical Summary

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 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 failure, resulting in very High block error rate (BLER), which also causes a large number of data retransmissions, which greatly reduces network throughput

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