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Method and system for correcting channel quality indication

A channel quality indication and channel sharing technology, applied in the field of high-speed downlink packet access, can solve the problems of CQI accuracy degradation and inaccurate CQI measurement, and achieve the effect of weakening feedback delay

Inactive Publication Date: 2009-04-22
CHINA ACAD OF TELECOMM TECH
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Problems solved by technology

[0011] In view of this, one of the purposes of the present invention is to provide a method for correcting channel quality indicators, which can solve the technical problems that the CQI accuracy decreases due to the feedback delay of channel quality indicators and the complex environment makes CQI measurement inaccurate to a certain extent.

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[0072] In the CQI fed back by the UE, the recommended transport block size RTBS ​​value can be converted into a certain coding rate. If the modulation mode is assumed to be the coding rate of 16QAM, the coding rate can be calculated according to the following formula:

[0073] V=TBS / (N*M), M=176 (Equation 1)

[0074] Wherein, TBS is a transport block size value, N is the number of SF16 code channels in a scheduling interval (Transmission Time Internal, TTI) related to the modulation mode, and M is the number of bits related to the modulation mode.

[0075] Assuming the i-th scheduling interval, the base station can calculate the latest identifier coding rate of the UE according to the CQI fed back by the UE according to formula 1 V in(i) , the UE's latest identifier coding rate calculated at the i-1th scheduling interval is set to V in(i-1) , the actual coding rate actually used in the i-1th scheduling interval is V out(i-1) , the coding rate correction offset actually used ...

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Abstract

The invention relates to the high-speed downlink packet access technology, in particular to a method of amending channel quality indictor and launching power in an HSDPA and a system thereof. To a certain extent, the invention can solve the problem that time delay in channel quality feedback can lead the accuracy of CQI to decrease and the complexity of the environment can lead the measurement of CQI to be not accurate. According to ACK / NACK message, the invention amends the present encoding rates, which can reduce the influence of the channel quality indicator feedback time delay and the influence of the environment complexity on channel quality indicator. With the condition of only adopting AMC technology, the block error rate of data block can be effectively controlled to be within 0.1.

Description

technical field [0001] The present invention relates to high-speed downlink packet access (High-Speed ​​Downlink Packet Access, HSDPA) technology, in particular to a method and system for correcting channel quality indication (Channel Quality Indicating, CQI) and transmission power in HSDPA. Background technique [0002] In the mobile communication system, in order to improve the downlink data transmission rate, 3GPP Release5 introduces the HSDPA technology. HSDPA is a link adaptive technology. When the user is close to the base station node and the channel condition is good, the system transmits data at a high rate; when the user is far away from the base station node and the channel condition is poor, the system uses a lower rate, and Not by increasing the power to increase the rate. This link adaptation technology is mainly realized by the mobile terminal feeding back a channel quality indicator, and the base station determining a modulation and coding scheme (Modulation...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/16H04L1/18
Inventor 周海军胡金玲邢艳萍
Owner CHINA ACAD OF TELECOMM TECH
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