Channel quality feedback method

A technology of channel quality and channel quality indication, applied in the field of data communication system and channel quality feedback, can solve the problems of not fully reflecting the real-time changes of channel quality and large feedback amount.

Active Publication Date: 2007-10-03
XFUSION DIGITAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a channel quality feedback method, which can solve the problem that the fixed-period channel quality feedback in the related art cannot fully reflect the real-time change of channel quality and the problem that the amount of feedback is large

Method used

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Examples

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no. 1 example

[0036] Referring first to FIG. 3 , FIG. 3 is a schematic diagram showing CQI feedback based on consecutive n NACKs according to the first embodiment of the present invention. In the first embodiment according to the present invention, the driving condition is the number of consecutive feedback error acknowledgments (NACKs).

[0037] Specifically, when the receiving end receives the sent data and needs to feed back NACK after the CRC judgment of the CRC verification error of the received data, the receiving end does not immediately feed back the CQI information, but continuously receives the data, and then judges whether the subsequent received data is wrong , and decide whether to feed back the CQI according to the subsequent data decoding situation, wherein, only when the CRC judgment error of the continuously received data reaches a certain number (n), that is, only when the continuous feedback NACK reaches a certain number of times (n), the feedback CQI value.

[0038] For...

no. 2 example

[0040] Referring next to FIG. 4 , FIG. 4 is a schematic diagram showing CQI feedback based on the mth retransmission of a certain data packet according to the second embodiment of the present invention. In the second embodiment according to the present invention, the driving condition is the number of times a certain data packet is retransmitted.

[0041] In the wireless transmission environment, in order to meet the correct reception of data packets within the number of retransmissions, the sender may need to change the coding and modulation mode, resource allocation, or power control during the retransmission process. At this time, it is necessary to receive feedback CQI information. In this way, whether to feed back the CQI can be determined according to the number of times the data packet is retransmitted. For example, if a certain data packet cannot be decoded correctly after the m retransmission, the CQI is fed back. For example, when m is 2, when the CRC verification is...

no. 3 example

[0043] Referring to FIG. 5 below, FIG. 5 is a schematic diagram illustrating CQI feedback based on other subchannels with t higher CQI values ​​according to a third embodiment of the present invention. In the third embodiment according to the present invention, the driving condition is the relationship between the CQI value of the data transmission sub-channel and the CQI values ​​of other sub-channels.

[0044] After receiving the data, the receiving end measures the channel characteristics of the data transmission sub-channel, calculates its signal-to-noise ratio, and measures the corresponding CQI. At the same time, the receiving end measures the channel information of other sub-channels and the CQI values ​​corresponding to other sub-channels. In this way, the receiving end decides whether to feed back the CQI according to the relationship between the CQI value of the data transmission sub-channel and the CQI values ​​of other sub-channels.

[0045] Specifically, the drivi...

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Abstract

A method for feeding channel quality back includes feeding channel quality indication back to sending end by receiving end according to driving condition and making said driving condition possibly be frequency of continuous feedback error response, frequency of data packet being retransmitted, relation of channel quality indication value (CQIV) at data transmission sub-channel to CQIV at the other sub-channel and relation of current CQIV to previous CQIV at data transmission sub-channel.

Description

technical field [0001] The present invention relates to the communication field, and more particularly relates to a channel quality feedback method, which is applicable to data communication systems in various environments including ground and satellite. Background technique [0002] At present, wireless data service is the hot spot and future direction of mobile communication. In order to provide the highest possible system throughput, it is required to measure and estimate the channel quality, and to feed it back to the transmitting network with the smallest possible delay and redundancy. terminal, so that the transmitting terminal can complete functions such as coding and modulation mode, resource allocation, power control, etc. according to the information. [0003] Adaptive coding and modulation (AMC) belongs to the category of link adaptation. The basic principle of AMC is to change the format of modulation and coding based on the information feedback of channel qualit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/20
Inventor 童剑飞葛绍伟
Owner XFUSION DIGITAL TECH CO LTD
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