Downlink cqi adaptive adjustment method and device

Abstract

The invention relates to a downlink CQI adaptive adjustment method and device. The method includes the following steps: in a service connection phase, caching service data units (SDUs) of a user terminal, and selecting multiple sampling periods in the caching process, wherein the following steps are performed in each sampling period: according to a preset SDU size threshold, dividing various SDUsin the sampling period into large packet SDUs, medium packet SDUs and small packet SDUs; determining whether the number of the large packet SDUs is greater than a preset number threshold of the largepacket SDUs; if yes, setting the step length base number of a channel quality indicator (CQI) as the first step length; otherwise, determining whether the number of the small packet SDUs is greater than a preset number threshold of the small packet SDUs, and when the determination result is yes, setting the step length base number of the CQI as the second step length, wherein the second step length is greater than the first step length; and calculating a downlink CQI value according to the step length base number of the CQI. According to the scheme of the invention, the data transmission rateof users can be improved, and thus wireless side data can be effectively transmitted to an upper-layer network element in time.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a downlink CQI adaptive adjustment method and device. Background technique [0002] At present, the LTE downlink coding method is mainly determined according to the CQI (that is, the channel quality indicator) reported by the terminal. MCS (that is, modulation and coding strategy) do a cycle, and use the corresponding beta value to fit the SINR (that is, signal-to-noise ratio) of each carrier for each MCS to calculate the corresponding equivalent SINR, and then use the equivalent SINR to find the best Get close to the target bit error rate, and then find the corresponding MCS level through the target bit error rate. After finding the MCS level, you can get the CQI value by looking up the table. Select MCS=MAX(MCS1,MCS2..MCSn)&BLER<10% with the largest bit error rate, and the base station determines the downlink coding method according to the CQI information fed...

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Problems solved by technology

[0013] It can be seen from Table 3 that when the CQI step base is 10, ΔCQI_DOWN is 90, and when the CQI step base is 20, ΔCQI_DOWN is 180. It can be seen that when the CQI step base changes, ΔCQI_DOWN will Doubling increases, resulting in large changes in ΔCQI

[0014] Since the CQI determination method in the prior art cannot be adjusted according to the characteristics of the service data, the data on the wireless side cannot be effectively and timely transmitted to the upper network element, and the data transmission rate needs to be improved. Therefore, it is necessary to provide an adaptive method according to the characteristics of the service data. CQI adjustment method

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