Monitoring method and system for wireless communication signal channel quality

A channel quality, wireless communication technology, applied in transmission control/equalization, communication between multiple stations, radio/induction link selection and arrangement, etc., can solve interference, reduce system performance, and reduce the accuracy of channel quality indication and other problems to achieve the effect of reducing feedback delay, reducing interference and improving system efficiency

Inactive Publication Date: 2008-02-27
CHINA ACAD OF TELECOMM TECH
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Problems solved by technology

[0009] When the MCS is determined only by the channel quality indication fed back by the mobile terminal, the accuracy of the channel quality indication is reduced due to the influence of the feedback delay of the channel quality indication, and the measurement of the channel quality indication is inaccurate due to the complexity of the actual environment
[0010] These will make the block error rate (BLER, Block Error Ratio) of the data exceed the target requirement of 0.1, thereby reducing the performance of the system
[0011] In addition, when the channel quality is higher than the MCS that Node B can indicate, keeping the transmit power of the shared channel unchanged will bring unnecessary interference

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  • Monitoring method and system for wireless communication signal channel quality

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[0048] The core idea of ​​the present invention is that the user terminal decodes the received data, and feeds back the decoding result to the base station through an ACK / NACK message, thereby correcting the channel quality indicator value fed back by the user terminal, and correspondingly correcting the data block according to the channel environment Adjust the size and transmit power.

[0049] Since directly mapping the SNR of the received signal to the channel quality indicator does not reflect the influence of the channel quality indicator feedback delay and the complexity of the actual environment on the channel quality indicator, the ACK / NACK information (the CRC check result of the received data) and The channel quality indication feedback delay and the complexity of the actual environment are directly related to the influence of the channel quality indication. Therefore, the present invention uses ACK / NACK information to correct the channel quality indication fed back b...

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Abstract

This invention discloses a monitor method for quality of radio communication channels including: a base station receives CQI value of a transfer channel got by UE based on the mapping relation of S/N ratio of received signals and CQI value and receives data decoding result fed by UE to determine a modulation mode and modulate data blocks sent to the UE and/or emission power based on said CQI and its offset volume determined by the decoding result. This invention also provides a monitor system including: a calculation unit used in getting CQI of transfer channels, a set and modulation unit determining a modulation mode, modulating sent data blocks and emission power based on the CQI value and its offset volume.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and system for monitoring the quality of a wireless communication channel. Background technique [0002] In order to improve the user's data transmission rate and system throughput, the 3GPP standardization organization introduced a High Speed ​​Downlink Package Access (HSDPA, High Speed ​​Downlink Package Access) technology to meet the asymmetrical requirements of uplink and downlink data services. HSDPA adopts high-order modulation, and achieves the purpose of improving system throughput through technologies such as adaptive modulation coding (AMC, Adaptive Modulation Code), hybrid automatic repeat request (HARQ, Hybrid Automatic Repeat Request) and fast scheduling. [0003] Adaptive modulation and coding AMC technology, as one of the key technologies of HSDPA, is a modulation and coding method that can adaptively adjust the transmission data to compensa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04B7/005H04Q7/38
Inventor 周海军胡金玲
Owner CHINA ACAD OF TELECOMM TECH
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