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Method and device for measuring channel state

A technology of channel state and measurement method, applied in the field of communication, can solve the problems such as difficulty in accurate measurement of mobile terminals, difficulty in obtaining maximum throughput efficiency, etc., and achieve the effect of improving accuracy

Active Publication Date: 2018-07-27
SPREADTRUM COMM (SHANGHAI) CO LTD
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AI Technical Summary

Problems solved by technology

[0008] The problem solved by the present invention is that in a static channel environment, it is difficult for the mobile terminal to accurately measure and obtain the best CQI, resulting in the difficulty of obtaining the maximum throughput efficiency

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  • Method and device for measuring channel state
  • Method and device for measuring channel state
  • Method and device for measuring channel state

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Embodiment Construction

[0071] In the prior art, in a static channel environment, there are problems in both the method of obtaining the CQI by measuring the pilot SNR and the method of obtaining the CQI by counting the PDSCH BLER.

[0072] The method of obtaining the CQI by measuring the SNR look-up table often fails to obtain the best CQI due to the difference between the SNR-CQI mapping table and the actual wireless environment, thereby failing to obtain the maximum data throughput.

[0073] The method of obtaining the CQI by simply counting the BLER often causes the throughput to drop due to the jitter of the CQI up and down due to the fluctuation of the BLER statistics. During the static channel test of an LTE terminal, it often occurs that the throughput obtained by a high SNR is smaller than that obtained by a low SNR.

[0074] In order to solve the above problems, the technical solution of the present invention provides a channel state measurement method.

[0075] Such as figure 1 As shown,...

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Abstract

A channel state measurement method and device, used to measure the channel state of the LTE system; the channel is a downlink static channel, the method includes: when the channel quality indicator value is greater than the first quality threshold, if the block error rate of the channel is greater than or Equal to the block error rate threshold, the channel quality indicator value is lowered by the first threshold, and the operation flag is set; when the operation flag is reset, if the block error rate of the channel is less than the block error rate threshold and the channel quality indicator is less than the second quality threshold, the channel quality indicator value is increased by the second threshold. In this method, after the channel quality indicator value is adjusted downward, if the measured block error rate of the channel is lower than the block error rate threshold, no upward adjustment operation is performed when the operation flag is set, which can effectively avoid the channel quality indicator value ping-pong The phenomenon of adjustment; using the channel block error rate to determine the channel quality indicator value, the best channel quality indicator value can be measured to obtain the maximum throughput efficiency.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and device for channel measurement of a communication state. Background technique [0002] Long Term Evolution (LTE, Long Term Evolution) is a broadband communication system with high-speed data services proposed by 3GPP, and is currently a widely recognized wireless communication technology. Since the transmission channel of wireless communication is a multipath fading, random time-varying channel, its channel state information will constantly change, and due to this change, the channel quality may fluctuate. Therefore, adaptive coding and modulation technology is adopted in the LTE system. In this technology, the user terminal measures the channel quality of the downlink data, calculates the channel state information according to the channel quality, and feeds back the channel state information to the base station. The base station dynamically allocates the best...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/08
Inventor 董宇沈旭强周秦英董霄剑
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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