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CQI acquiring method and CQI acquiring device

An acquisition method and a technology for an acquisition device, which are applied in the field of CQI acquisition methods and devices, and can solve problems such as channel environment mismatch and throughput decline.

Active Publication Date: 2017-03-08
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the Doppler fading environment, the channel environment after 10ms may change greatly, resulting in the mismatch between the currently reported CQI and the delayed channel environment, resulting in a decrease in throughput

Method used

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  • CQI acquiring method and CQI acquiring device
  • CQI acquiring method and CQI acquiring device
  • CQI acquiring method and CQI acquiring device

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Embodiment Construction

[0075] In the prior art, taking TDD-LTE as an example, after the CQI is reported to the network side, the network side uses the currently reported CQI to schedule the Transport Block (TB) after a delay of at least 10 ms. In a Doppler fading environment, the channel environment after 10 ms may change greatly. If the network side transmits TB blocks strictly according to the currently reported CQI, due to changes in the wireless channel environment, the currently reported CQI does not match the delayed channel environment, and the system throughput decreases.

[0076] In the embodiment of the present invention, when the moving speed of the mobile terminal is lower than the preset speed, the variation law of the average mutual information is obtained by counting the average mutual information of the current subframe and previous multiple subframes. When the average mutual information increases sequentially with the order of subframes, the average mutual information corresponding ...

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Abstract

A CQI acquiring method and a CQI acquiring device are provided. The method comprises the following steps: acquiring the current moving speed of a mobile terminal; when the moving speed is lower than a preset speed, calculating the mean mutual information corresponding to multiple consecutive sub-frames before a current sub-frame; acquiring the change trend of the mean mutual information corresponding to the multiple consecutive sub-frames before the current sub-frame, and correcting the mean mutual information corresponding to the current sub-frame according to the preset corresponding relationship between change trend and corrected value to get corrected mean mutual information; and acquiring a CQI corresponding to the corrected mean mutual information, and sending the CQI to a network side. By using the method and the device, a reported CQI can match a channel environment after delay, and the system throughput can be improved.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a CQI acquisition method and device. Background technique [0002] Long Term Evolution (LTE) is a long-term evolution of the general mobile communication system technology led by the 3rd Generation Partnership Project (3GPP), and is currently a widely recognized wireless communication technology. [0003] In a fading channel, the LTE terminal can use the average mutual information (Mutual Information, MI) of subcarriers to measure channel state information (Channel State Information, CSI). Use MI as the equivalent mutual information under the Additive White Gaussian Noise (AWGN) channel, determine the CQI value according to the mapping relationship between the equivalent mutual information and the Channel Quality Indicator (CQI), and feed it back to the network side. Or the MI is equivalent to the equivalent SINR of the AWGN channel, and the CQI value is determined...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04W24/08
CPCH04L1/0022H04W24/08
Inventor 董宇沈旭强车永侠
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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