CN101374014A - Feedback method for channel quality indication - Google Patents
Feedback method for channel quality indication Download PDFInfo
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- CN101374014A CN101374014A CNA2007101404924A CN200710140492A CN101374014A CN 101374014 A CN101374014 A CN 101374014A CN A2007101404924 A CNA2007101404924 A CN A2007101404924A CN 200710140492 A CN200710140492 A CN 200710140492A CN 101374014 A CN101374014 A CN 101374014A
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Abstract
The invention provides a method for feeding back a channel quality indication (CQI). After constructing CQI information, a receiving mechanism feeds a mean CQI of resource blocks and position information of unavailable resource blocks back to a transmitter. The feedback of the mean CQI of the resource blocks refers to one of the following cases: feedback of a mean value of CQIs of all resource blocks; and feedback of a mean value of CQIs above zero; feedback of a mean value of CQIs greater than a set threshold. The feedback of position information of unavailable resource blocks refers to that: a receiver sequentially arranges the position information of the all resource blocks to form a data flow, and transmits to the transmitter, wherein zeros with 1 bit represent unavailable resource blocks and ones with 1 bit represent available resource blocks. When the frequency selectivity of channels is not high, by using the technical proposal provided in the invention, the channel fidelity reflected by the CQI information is improved without increasing feedback cost.
Description
Technical field
The present invention relates to the quality index of a channel in the communications field, be specifically related to the feedback method of quality index of a channel.
Background technology
Quality index of a channel (Channel Quality Indication abbreviates CQI as) is the channel condition information that receiver feeds back to transmitter in the communication system.
Transmitter corresponds to certain resource block size, coded system and modulation system with the CQI information that receiver fed back, and on this basis, transmitter is that receiver carries out resource allocation and scheduling according to CQI information.Therefore, CQI information the really degree of the channel that can reflect and the expense of feeding back the up link that is consumed all can produce bigger influence to systematic function.Yet in fact, the resource that the validity of the channel that CQI information is reflected and feedback are consumed is a pair of contradiction, if need to reflect as far as possible truly channel, then can take the strategy of unity feedback, promptly feed back the channel quality information of each scheduling unit on the whole working band, but this will produce huge expense.For example, for the communication system of a 10M bandwidth, OFDM (the Orthogonal Frequency DivisionMultiplexing that adopts, abbreviating OFDM as) technology is divided into 600 subcarriers with whole frequency band, per 24 subcarriers are as a Resource Block, totally 25 Resource Block; Each Resource Block so just needs 25 CQI values to reflect the channel quality of each Resource Block on the whole frequency band as a scheduling unit.
At present, proposed several different methods, mainly contained following several at the feedback of CQI:
(1) average CQI feedback: average CQI value of whole transmission bandwidth internal feedback;
(2) CQI feeds back fully: the CQI value of feeding back all Resource Block in the whole bandwidth;
(3) CQI of M the strongest Resource Block feedback: feed back M maximum CQI value, the positional information of its place Resource Block, and the average CQI value on other Resource Block;
(4) the CQI average of M the strongest Resource Block feedback: feed back the average of M maximum CQI value, the positional information of its place Resource Block, and the average CQI value on other Resource Block;
(5) the CQI feedback of the strongest M of a grouping Resource Block: the mode of circulation is adopted in grouping, reports the CQI of M the strongest in one group Resource Block at every turn;
(6) CQI based on the DCT-M conversion feeds back; At first at receiving terminal channel measured value is carried out dct transform, quantize compression, compressed value is fed back to transmitting terminal, transmitting terminal carries out the DCT inverse transformation to value of feedback again and obtains channel measured value, obtains corresponding CQI value;
(7) based on the CQI of thresholding feedback: the CQI value in the full range band of measuring based on each receiver, calculate the mean value that is included in the interior CQI value of the highest CQI value and CQI thresholding, the positional information of this average CQI value and these CQI values is fed back to transmitter;
(8) differential CQI feedback: the differential CQI value (1-bit) of at every turn feeding back an absolute CQI value and other Resource Block; Wherein, the calculating of differential CQI bit can be divided into the difference information in calculated rate territory and the difference information dual mode of calculating time domain;
(9) graduation continuous resource piece CQI feedback: whole transmission bandwidth divides some grades, comprises the information and the CQI value information of class information, Resource Block in the CQI feedback information;
(10) the discontinuous Resource Block CQI feedback of graduation: comprise the bitmap and the CQI value of Resource Block in the CQI feedback information, wherein, bitmap has provided the position with the corresponding Resource Block of CQI value.
In above-mentioned the whole bag of tricks, method (1) though the expense minimum that up link is caused, the channel validity that is reflected for CQI information is not high, and does not possess and carry out the advantage that frequency is selected; Method (2) will be brought huge expense to up link though can more accurately reflect channel quality status on each Resource Block; There is certain compensation method (3), (4), (5), (6) to the shortcoming of method (1) and (2), but for the stronger channel of frequency domain selectivity, the quality of channel situation may have bigger difference on each Resource Block, therefore the several Resource Block that use identical CQI value to represent channel quality to differ bigger will produce than mistake, cause irrational resource allocation, thereby cause systematic function to descend; And the computation complexity of method (7), (8), (9) is higher.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method of feedback of channel quality indication, has increased the channel validity that CQI information is reflected under the situation that guarantees low feedback overhead.
In order to address the above problem, the invention provides a kind of method of feedback of channel quality indication, to the average channel quality index of transmitter feedback resource block, also feed back the positional information of unavailable Resource Block simultaneously after the receiver structure quality index of a channel information.
Further, the average channel quality index of feedback resource block is meant a kind of in following several situation: the mean value that feeds back the quality index of a channel of all Resource Block; Feed back all mean values greater than 0 quality index of a channel; Feedback is greater than the mean value of the quality index of a channel of the threshold value of setting.
Further, the positional information of the unavailable resource of described feedback is meant: receiver is arranged in order the positional information of all Resource Block in order to be formed a data flow and feeds back to transmitter, represent unavailable Resource Block with 0 of 1 bit, represent available resource block with 1 of 1 bit.
Further, described method also comprises: transmitter is that 0 Resource Block is designated as unavailable resource with the positional information intermediate value of feedback after each feedback constantly receives described feedback information; The quality index of a channel of all the other Resource Block is the mean value of described quality index of a channel, and carries out resource allocation and scheduling according to the quality index of a channel that redefines.
Further, described unavailable Resource Block be following any: the quality index of a channel of receiver statistics be zero or the Resource Block, the transmitter that are lower than certain threshold value think scheduling meeting to this Resource Block cause the insecure Resource Block of transmission, reserved can not be as the Resource Block of his usefulness.
In sum, the invention provides a kind of method of feedback of channel quality indication, when the frequency selectivity of channel is little, can adopt an average CQI value to reflect the channel conditions of whole frequency band, the position of unavailable Resource Block in the while feedback channel, the latter revises the CQI value of whole frequency band, has increased the channel validity that CQI information is reflected, and can realize with lower feedback overhead.
Description of drawings
Fig. 1 is the process chart of the inventive method embodiment;
Fig. 2 is that the present invention feeds back unavailable resource block location information schematic diagram.
Embodiment
The invention provides a kind of method of feedback of channel quality indication, promptly when transmitter feeds back average CQI value, also feed back the positional information of unavailable Resource Block when receiver; Transmitter recovers the quality index of a channel of each Resource Block constantly according to the CQI value that receives in each feedback.
Present embodiment relates to a kind of method of feedback of channel quality indication, and as shown in Figure 1, its concrete operations are as described below:
Step 101: in each feedback constantly, receiver is constructed the quality index of a channel information of each Resource Block, the same prior art of its building method;
Quality index of a channel information is the channel condition information of receiver to the transmitter feedback.And channel condition information comprises: the quantized value of channel quality measurements or statistical value, and the positional information of the Resource Block of measured value correspondence.Above-mentioned measured value is following any or its combination in any: signal noise ratio (SNR), signal interference plus noise are than time selectivity parameter, the frequency selectivity parameter of (SINR), signal strength signal intensity, channel.
Step 102: the average CQI value of receiver computational resource piece, and feed back the positional information of this average CQI value and unavailable Resource Block to transmitter; The mean value that the average CQI value of Resource Block can be the CQI of all Resource Block also can be all greater than the mean value of 0 CQI, can also be the mean value greater than the CQI of certain threshold value; Described threshold value is decided according to actual conditions;
The positional information of feeding back unavailable Resource Block is meant: receiver is arranged in order the positional information of all Resource Block in order to be formed a data flow and feeds back to transmitter, represents unavailable Resource Block with 0 of 1 bit, represents available resource block with 1 of 1 bit.As shown in Figure 2, if n Resource Block arranged, then can express the position of available resource block and the position of unavailable Resource Block with the number of n bit, first Resource Block can be used shown in the figure, second Resource Block is unavailable, and n-1 Resource Block is unavailable, and n Resource Block can be used.
Unavailable Resource Block be following any: the quality index of a channel of receiver statistics be zero or the Resource Block, the transmitter that are lower than certain threshold value think scheduling meeting to this Resource Block cause the insecure Resource Block of transmission, reserved can not be as the Resource Block of his usefulness.
Step 103: transmitter recovers to redefine the quality index of a channel of each Resource Block according to the quality index of a channel information that receives; Its restoration methods can be: transmitter is that those Resource Block of 0 are labeled as disabled Resource Block with the positional information intermediate value, and the CQI value of all the other Resource Block adopts average CQI value.
Step 104: transmitter carries out resource allocation and scheduling according to the CQI value of each Resource Block that redefines in the step 103, the same prior art of the method for resource allocation and scheduling.
Further specify with an application example below:
Down link with a 10M bandwidth communication systems is an example, adopts the OFDM technology, and whole frequency band is divided into 600 subcarriers, and per 24 subcarriers are as a Resource Block, i.e. scheduling unit, totally 25 Resource Block.Therefore the positional information that can represent each Resource Block with 25 bits, the position of promptly expressing available and unavailable Resource Block.Receiver is UE (user terminal) in this example, and transmitter is the base station; Adopting the method for the average CQI value of all Resource Block of feedback, is that 0 Resource Block is regarded unavailable Resource Block as with the CQI value, and all the other Resource Block are regarded available resource block as.
Step 201:UE calculates the SINR of each Resource Block, and determines the CQI value of each Resource Block corresponding with SINR, totally 25 CQI values;
Step 202:UE calculates the position that the average of 25 CQI values and CQI value are 0 Resource Block, and the average calculated and the positional information of unavailable Resource Block fed back to the base station, the positional information of feeding back unavailable Resource Block is about to available resource block and represents with 1 of 1 bit, unavailable Resource Block is represented with 0 of 1 bit, these 1 or 0 sequence of positions by Resource Block are arranged in order data flow of composition feed back to transmitter, only need represent the position of available and unavailable Resource Block here with 25 bits.
Step 203: the base station is that those Resource Block of 0 are labeled as disabled Resource Block with the positional information intermediate value, and the CQI value of all the other Resource Block adopts average CQI value;
Step 204: resource allocation and scheduling are carried out according to the CQI value of each Resource Block in the base station.
Claims (5)
1. the method for a feedback of channel quality indication, after the receiver structure quality index of a channel information to the average channel quality index of transmitter feedback resource block, it is characterized in that receiver also feeds back the positional information of unavailable Resource Block in the average channel quality index of feedback resource block.
2. the method for claim 1 is characterized in that, the average channel quality index of feedback resource block is meant a kind of in following several situation: the mean value that feeds back the quality index of a channel of all Resource Block; Feed back all mean values greater than 0 quality index of a channel; Feedback is greater than the mean value of the quality index of a channel of the threshold value of setting.
3. the method for claim 1, it is characterized in that, the positional information of the unavailable resource of described feedback is meant: receiver is arranged in order the positional information of all Resource Block in order to be formed a data flow and feeds back to transmitter, represent unavailable Resource Block with 0 of 1 bit, represent available resource block with 1 of 1 bit.
4. method as claimed in claim 3 is characterized in that, described method also comprises: transmitter is that 0 Resource Block is designated as unavailable resource with the positional information intermediate value of feedback after each feedback constantly receives described feedback information; The quality index of a channel of all the other Resource Block is the mean value of described quality index of a channel, and carries out resource allocation and scheduling according to the quality index of a channel that redefines.
5. as claim 1 or 3 described methods, it is characterized in that, described unavailable Resource Block be following any: the quality index of a channel of receiver statistics be zero or the Resource Block, the transmitter that are lower than certain threshold value think scheduling meeting to this Resource Block cause the insecure Resource Block of transmission, reserved can not be as the Resource Block of his usefulness.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931989A (en) * | 2009-06-26 | 2010-12-29 | 华为技术有限公司 | Feedback method and device |
| CN102474868A (en) * | 2009-09-29 | 2012-05-23 | 上海贝尔股份有限公司 | Method and equipment for estimating downlink channel condition |
| CN110167148A (en) * | 2018-02-12 | 2019-08-23 | 大唐移动通信设备有限公司 | A kind of distribution method and device of radio resource |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101291171A (en) * | 2007-04-20 | 2008-10-22 | 中兴通讯股份有限公司 | Feedback method of indication of communication channel quality |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101291171A (en) * | 2007-04-20 | 2008-10-22 | 中兴通讯股份有限公司 | Feedback method of indication of communication channel quality |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931989A (en) * | 2009-06-26 | 2010-12-29 | 华为技术有限公司 | Feedback method and device |
| CN101931989B (en) * | 2009-06-26 | 2013-08-14 | 华为技术有限公司 | Feedback method and device |
| CN102474868A (en) * | 2009-09-29 | 2012-05-23 | 上海贝尔股份有限公司 | Method and equipment for estimating downlink channel condition |
| CN102474868B (en) * | 2009-09-29 | 2014-07-23 | 上海贝尔股份有限公司 | Method and equipment for estimating downlink channel condition |
| CN110167148A (en) * | 2018-02-12 | 2019-08-23 | 大唐移动通信设备有限公司 | A kind of distribution method and device of radio resource |
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| CN101374014B (en) | 2013-06-05 |
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