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CQI threshold adjustment method and device

A threshold adjustment and threshold technology, applied in the field of communications, can solve problems such as low adjustment accuracy

Active Publication Date: 2017-07-04
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, using the above method to adjust the CQI threshold may lead to repeated ping-pong adjustment effects, and the adjustment accuracy is low.

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  • CQI threshold adjustment method and device
  • CQI threshold adjustment method and device
  • CQI threshold adjustment method and device

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Embodiment Construction

[0074] Since the performance of UE depends on many factors such as channel estimation error and noise estimation error, and these errors behave differently under different external conditions, the simulation threshold of CQI may not match the performance of the receiver in some cases. At present, the UE side uniformly adjusts the threshold of the CQI gear according to the block error rate obtained through statistics.

[0075] However, using the above method to adjust the CQI threshold may result in repeated ping-pong adjustment effects, and the adjustment accuracy is low.

[0076] In order to solve the above problems, the embodiment of the present invention provides a method for adjusting the CQI threshold, by comparing the filtered signal quality information of each CQI gear with the preset signal quality information of the corresponding gear respectively, to obtain the comparison result , selecting the CQI gear corresponding to the value with the largest absolute value in th...

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Abstract

The invention discloses a CQI threshold adjustment method and device. The method comprises the following steps: calculating the information of the signal quality of each CQI gear corresponding to a signal by using a sliding window method; filtering the information of the signal quality of each CQI gear according to a filter factor corresponding to each CQI gear; separately comparing the filtered information of the signal quality of each CQI gear with the information of the preset signal quality of the corresponding gear to obtain a comparison result, and selecting the CQI gear corresponding to the value with a maximum absolute value in the comparison result as the kth gear; calculating to obtain the corresponding adjustment step length separately according to the comparison results of the k-1th, the kth and the k+1th CQI gears; and correspondingly adjusting the threshold of the kth CQI gear according to the relation between the adjustment step length and the preset adjustment step length. By adopting the scheme disclosed by the invention, the accuracy of the adjustment of the CQI threshold can be increased.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for adjusting a CQI threshold. Background technique [0002] In modern communication systems, user equipment usually needs to report a Channel Quality Indicator (CQI) to the base station, so that the base station can determine the mode of data modulation according to the CQI and refer to the Modulation and Coding Scheme (MCS) and sending rate. Usually, the user equipment (User Equipment, UE) obtains parameters reflecting channel quality such as signal-to-noise ratio (SIGNAL-NOISE RATIO, SNR) and mutual information (Mutual Information, MI) by evaluating the channel quality, and then the parameters The value is compared with the threshold value obtained by simulation to obtain the final CQI. [0003] Since the performance of UE depends on many factors such as channel estimation error and noise estimation error, and these errors behave differently under differ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04W72/12
CPCH04L1/0026H04W72/542
Inventor 田琛李俊强
Owner BEIJING SPREADTRUM HI TECH COMM TECH CO LTD