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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: 2019-11-15
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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  • 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

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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

A CQI threshold adjustment method and device, the method comprising: using a sliding window method to count signal quality information of each CQI gear corresponding to the signal; according to the filter factor corresponding to each CQI gear, for each The information of the signal quality of each CQI stall is filtered; The information of the signal quality of each CQI stall after filtering is compared with the information of the preset signal quality of corresponding stall respectively, obtains comparison result, selects described comparison result The CQI gear corresponding to the value with the largest absolute value is the kth gear; respectively, according to the comparison results of the k-1th, the kth and the k+1th CQI gears, the corresponding an adjustment step; according to the relationship between the adjustment step and a preset adjustment step, correspondingly adjust the threshold of the kth CQI gear. Adopting the above solution can improve the accuracy of CQI threshold adjustment.

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 a modern communication system, the user equipment usually needs to report a signal quality indicator (Channel Quality Indicator, CQI) to the base station, so that the base station can determine the mode of data modulation and Send rate. Usually, the user equipment (UserEquipment, 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 parameter value Compared with the threshold value obtained by simulation, the final CQI is obtained. [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 different external conditions, the simulation threshold o...

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Application Information

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Patent Type & Authority Patents(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