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Method and terminal for feeding back channel quality

A channel quality and level technology, applied in the field of communication, can solve the problems of affecting throughput, retransmission, transmission errors, etc., and achieve the effect of improving throughput

Active Publication Date: 2012-04-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the process of research and practice of the prior art, the inventor of the present invention found that in the first solution, the amount of feedback is relatively large; in the second solution, if the user feeds back the average MCS of the five best bands, such a situation will occur , that is, the MCS of the five best bands are 3, 3, 2, 2, 2 respectively, but the calculated average MCS is 3. If 3 is still used as the common scheduling MCS of these bands, it may cause actual The user whose MCS of the feedback band is 2 adopts a relatively high-order modulation and coding method, causing possible transmission errors and retransmissions, and affecting downlink throughput

Method used

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  • Method and terminal for feeding back channel quality
  • Method and terminal for feeding back channel quality
  • Method and terminal for feeding back channel quality

Examples

Experimental program
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Embodiment 1

[0026] Embodiment 1, please refer to figure 1 It is a flowchart of an embodiment of a channel quality feedback method of the present invention; in this embodiment, it is assumed that the average MCS of the five best bands needs to be fed back.

[0027] Step 101, obtaining the initial average MCS of the five bands that need feedback;

[0028] Assume that the initial average MCS of the five best bands is 3, and the respective MCSs of the five best bands are: 2, 2, 2, 3, 3 respectively.

[0029] Step 102, calculating the linear difference value between the respective MCS of the five best bands and the initial average MCS;

[0030] Use t=k 1 (X-Y 1 )+k 2 (X-Y 2 )+......+k m (X-Y m ) formula to calculate the linear difference value, at this time take k 1 , k 2 ,...k 5 are 1, the calculated linear difference value is t=(2-3)+(2-3)+(2-3)+(3-3)+(3-3)=-3.

[0031] Step 103, estimating the threshold;

[0032] Here the threshold is determined according to the value when calcu...

Embodiment 2

[0061] Embodiment two, please refer to figure 2 It is a flow chart of the second embodiment of a channel quality feedback method of the present invention; when only one quality level appears multiple times, the purpose of adjustment can be achieved by using this embodiment.

[0062] Step 201, obtaining the initial average MCS of the best five bands that need feedback;

[0063] For example: the initial average MCS of the best five bands is 3.

[0064] Step 202, obtaining the respective MCS of the best five bands;

[0065] For example: the respective MCS of the best five bands obtained at this time are 2, 2, 2, 3, 3.

[0066] Step 203, recording the MCS with the highest number of occurrences among the respective MCSs of the best five bands;

[0067] Should be 2 here.

[0068] Step 204, adjusting the initial average MCS according to the recorded MCS with the largest number of occurrences;

[0069] Here, since the MCS with the most occurrences is 2 less than the initial aver...

Embodiment 3

[0071] Embodiment three, please refer to image 3 It is a structural diagram of an embodiment of a terminal in the present invention; this embodiment is an embodiment of a terminal adopting the method of Embodiment 1.

[0072] An average channel quality level acquisition unit 301, configured to acquire the average channel quality level of multiple subbands to be fed back;

[0073] A subband channel quality level acquisition unit 302, configured to acquire the respective channel quality levels of the multiple subbands;

[0074] An adjustment unit 303, configured to adjust the average channel quality level according to the respective channel quality levels of the multiple subbands, to obtain the adjusted average channel quality level;

[0075] The adjustment unit 303 may further include:

[0076] A linear difference value calculation unit 3031, configured to calculate a linear difference value between the channel quality of the multiple subbands and the average channel quality...

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Abstract

The invention discloses a method for feeding back channel quality, and the embodiment of the invention also discloses a corresponding terminal. The method comprises the following steps: acquiring an average channel quality rank of a plurality of sub-bands which are required to be fed back; acquiring the channel quality rank of each of the plurality of sub-bands, adjusting the average channel quality rank according to the channel quality rank of each of the plurality of sub-bands to obtain the adjusted average channel quality rank; and sending the adjusted average channel quality rank. The method and the terminal adopt a technical scheme of adjusting the average MCS, so the average MCS fed back is more precise and the feedback quantity does not increase on the basis that only one adjusted average MCS is required to be fed back so as to contribute to improving the throughput of the whole system.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a channel quality feedback method and a terminal. Background technique [0002] Due to the existence of multipath in the wireless environment and the difference in the wireless environment where the users are located, some users show large channel fading characteristics on one frequency, and show small channel fading characteristics on another frequency; A frequency shows a large channel fading feature, while other users have only a small channel fading feature on the same frequency. Therefore, if the feature of frequency selectivity is fully utilized, the most suitable frequency resources (data subcarrier resources) are allocated to users during resource scheduling, which can greatly improve the system capacity. This technique is called frequency selective scheduling (also known as subband scheduling). [0003] In an OFDMA system that actually implements frequency-select...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W88/02H04B7/26
Inventor 钱韬司宏杰王克学
Owner HUAWEI TECH CO LTD