CN102215086A - Channel quality indicator feedback method and device - Google Patents
Channel quality indicator feedback method and device Download PDFInfo
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- CN102215086A CN102215086A CN2010101491229A CN201010149122A CN102215086A CN 102215086 A CN102215086 A CN 102215086A CN 2010101491229 A CN2010101491229 A CN 2010101491229A CN 201010149122 A CN201010149122 A CN 201010149122A CN 102215086 A CN102215086 A CN 102215086A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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Abstract
The invention provides a channel quality indicator feedback method and a channel quality indicator feedback device. The method comprises the following steps of: acquiring an index value of a channel quality indicator of a current feedback period; determining current channel quality variation characteristics according to the index value of the channel quality indicator; and obtaining a channel quality indicator feedback value of the current feedback period according to the current channel quality variation characteristics. The device comprises a channel quality indicator acquisition module, a channel quality variation characteristic determination module and a channel quality indicator feedback module. By the method and the device, the channel quality indicator feedback value can be correspondingly regulated according to current channel quality, and the accuracy of the fed back channel quality indicator is improved.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of feedback method and device of channel quality indication (CQI) information.
Background technology
LTE (Long Term Evolution, Long Term Evolution) system is in order to provide high downlink grouped transmitting data service to the user, adopted according to current data volume to be scheduled and current (UserEquipment arranged, UE) resources such as disposal ability of Fan Kui channel quality, UE, utilize adaptive coding and modulating (Adaptive Modulation and Coding, AMC) give the user with only time-frequency resource allocating dynamically, improve the scheduling strategy of throughput of system to greatest extent.AMC is meant the modulation system and the code rate of adaptive adjustment transmission data, because the influence of fading that channel variation causes to received signal, and then improves the signal-to-noise performance of received signal with compensation, finally obtains the higher system throughput.
In order to realize adaptive coding and modulating, (ChannelQuality Indicator CQI) feeds back to the base station with channel quality indication (CQI) information to need UE.Owing to the performance of AMC is all comparatively responsive for measure error and feedback delay, thereby need to guarantee that UE is timely, accurate for the feedback of CQI.
At present, in the LTE system, in order better to improve the utilance of downlink traffic channel and the performance of AMC, usually adopt the mode of periodic feedback downlink traffic channel quality of reception indication, report the CQI index value with decision-making foundation as the AMC scheduling at the SINR of a down receiving signal mass measurement of each feedback cycle foundation.But, report cycles to be feedback such as the CQI of down channel transmission quality that UE measures and feedback needs just can send because arriving, and the processing granularity of dispatching algorithm is obviously greater than a report cycle, add the characteristics (as rapid fading) of channel self, if just simple SINR according to a down receiving signal mass measurement reports the CQI index value, may occur because the acute variation of transmission channel, the UE side is because of the low excessively SINR of actual reception moment wireless channel, the modulation system of high-order in can't the demodulation descending scheduling, cause Data Receiving failure in this section period, thereby the CQI that can not give feedback of CQI timely or feedback is inaccurate, so not only can increase the interference of whole system, the acute variation that flow also can occur can not improve the disposal ability of system to greatest extent.
Summary of the invention
Technical problem to be solved by this invention is: a kind of feedback method and device of channel quality indication (CQI) information are provided, the accuracy of channel quality indication (CQI) information feedback can be provided.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of feedback method of channel quality indication (CQI) information comprises:
Obtain the index value of the channel quality indication (CQI) information of current feedback cycle;
Determine current variations feature according to the index value of described channel quality indication (CQI) information;
Draw the channel quality indication (CQI) information value of feedback of current feedback cycle according to current variations feature.
In an embodiment of the present invention, the described channel quality indication (CQI) information value of feedback that draws current feedback cycle according to current variations feature comprises: if the current channel of current variations characteristic present is non-Quick-Change channel, then the channel quality indication (CQI) information value of feedback of current feedback cycle is the correction value that the channel quality indication (CQI) information value of feedback of last feedback cycle draws by default principle correction.
In the above-described embodiments, describedly comprise: obtain the desired value that the index value of the channel quality indication (CQI) information of current feedback cycle and last feedback cycle obtains based on probability of occurrence respectively by default principle correction; Calculate the difference between the desired value of channel quality indication (CQI) information index value of the desired value of channel quality indication (CQI) information index value of current feedback cycle and last feedback cycle; With the channel quality indication (CQI) information of described difference and last feedback cycle and as the channel quality indication (CQI) information value of feedback of current feedback cycle.
In another embodiment of the invention, the described channel quality indication (CQI) information value of feedback that draws current feedback cycle according to current variations feature comprises: if the current channel of current variations characteristic present is a Quick-Change channel, then the channel quality indication (CQI) information value of feedback of current feedback cycle is the highest index value of probability of occurrence in the index value of channel quality indication (CQI) information of current feedback cycle.
In some embodiments of the invention, described index value according to described channel quality indication (CQI) information determines that current variations feature comprises: the variance of calculating described channel quality indication (CQI) information index value based on the probability of occurrence of the index value of described channel quality indication (CQI) information, described variance and preset channel quality threshold are compared, when described variance smaller or equal to described preset channel quality threshold, determine that current channel is non-Quick-Change channel; When described variance greater than described preset channel quality threshold, determine that current channel is a Quick-Change channel.
In some embodiments of the invention, obtain the index value of the channel quality indication (CQI) information of current feedback cycle by the Signal Interference and Noise Ratio of measuring the downlink traffic channel received signal.
In some embodiments of the invention, described method is applied to long evolving system.
The feedback device of a kind of channel quality indication (CQI) information provided by the invention comprises:
The channel quality indication (CQI) information acquisition module is used to obtain the index value of the channel quality indication (CQI) information of current feedback cycle;
Variations feature determination module is used for determining current variations feature according to the index value of described channel quality indication (CQI) information;
The channel quality indication (CQI) information feedback module is used for drawing according to current variations feature the channel quality indication (CQI) information value of feedback of current feedback cycle.
In an embodiment of the present invention, described channel quality indication (CQI) information feedback module comprises according to the channel quality indication (CQI) information value of feedback that current variations feature draws current feedback cycle: the current channel of current variations characteristic present is non-Quick-Change channel, and then the channel quality indication (CQI) information value of feedback of current feedback cycle is the correction value that the channel quality indication (CQI) information value of feedback of last feedback cycle draws by default principle correction.
In an embodiment of the present invention, described channel quality indication (CQI) information feedback module comprises according to the channel quality indication (CQI) information value of feedback that current variations feature draws current feedback cycle: the current channel of current variations characteristic present is a Quick-Change channel, and then the channel quality indication (CQI) information value of feedback of current feedback cycle is the highest index value of probability of occurrence in the index value of channel quality indication (CQI) information of current feedback cycle.
The present invention determines the variations feature according to the channel quality indication (CQI) information index value, thereby the corresponding channel quality indication (CQI) information value of feedback that draws current feedback cycle, thereby make that the channel quality indication (CQI) information value of feedback is able to adjust accordingly according to current channel quality, improved the accuracy of the channel quality indication (CQI) information of feedback.
Description of drawings
Fig. 1 is the structured flowchart of the feedback device of the embodiment of the invention;
Fig. 2 is the flow chart of the feedback method of the embodiment of the invention.
Embodiment
Contrast accompanying drawing and the present invention is elaborated below in conjunction with embodiment.
Summary of the invention
As mentioned before, if in feedback cycle, channel quality generation acute variation may cause the value of feedback accuracy of CQI to descend, thereby the AMC performance is reduced.For this reason, the invention provides feedback method and the device of a kind of CQI, can be according to variations the value of feedback of corresponding correction CQI, thereby improve the value of feedback of CQI.The key step of its feedback method comprises:
Obtain the index value of the channel quality indication (CQI) information of current feedback cycle;
Determine current variations feature according to the index value of described channel quality indication (CQI) information;
Draw the channel quality indication (CQI) information value of feedback of current feedback cycle according to current variations feature.
Owing to carry out quantitative analysis according to the CQI index value, determine current mass change feature, thereby can draw CQI value of feedback, decision-making foundation accurately can be provided for the scheduling of AMC near current actual channel condition, thereby can reduce the interference of system, improve the capacity of system.
As shown in Figure 1, the main modular of feedback device of the present invention comprises: channel quality indication (CQI) information acquisition module, variations feature determination module, channel quality indication (CQI) information feedback module, wherein,
The channel quality indication (CQI) information acquisition module is used to obtain the index value of the channel quality indication (CQI) information of current feedback cycle;
Variations feature determination module is used for determining current variations feature according to the index value of described channel quality indication (CQI) information;
The channel quality indication (CQI) information feedback module is used for drawing according to current variations feature the channel quality indication (CQI) information value of feedback of current feedback cycle.
Said apparatus, suitable, can realize and be integrated among the UE by example, in hardware such as special chip or FPGA; Also can be used as one section executable program, solidify in UE.
Embodiment
As shown in Figure 2, the flow process of the CQI feedback method of the embodiment of the invention comprises:
1, measures the SINR (Signal Interference and Noise Ratio) of professional receive channel in the current feedback cycle and obtain corresponding CQI index value; Obtain the know technology of CQI index value according to SINR, for example can obtain the mapping relations of SINR and CQI, then draw corresponding CQI by the SINR that measures according to mapping relations by emulation for those skilled in the art; Obtaining of CQI index value also is not limited to obtain by measuring SINR, for example also can measuring by SNR (signal to noise ratio).
2,, calculate the probability distribution of its numerical value in feedback cycle according to the CQI in the feedback cycle; Also promptly draw the probability of occurrence of each CQI index value in the feedback cycle; (a plurality of CQI index values are arranged in the feedback cycle, refer to repeatedly measure in the feedback cycle the corresponding CQI of each time measurement of SINR, for example in a feedback cycle, are set a plurality of measuring periods, measure a SINR when arrive in each measuring period, and obtain corresponding CQI)
3,, calculate the expectation E and the variance D of the CQI index value in the current feedback cycle according to each CQI index value and probability of occurrence thereof;
4, according to the variance D of CQI, judge the variation grades of current channel, promptly determine current variations feature; See table 1, (in the table 1, this value is 4 with the variance D of CQI and preset channel quality threshold; This for experiment method draw than the figure of merit, but be not limited to get this value) compare, when variance D smaller or equal to the preset channel quality threshold, determine that current channel is non-Quick-Change channel, become or become slowly channel in comprising; When variance D greater than the preset channel quality threshold, determine that current channel is a Quick-Change channel; If the current channel of variations characteristic present is a Quick-Change channel, then choose CQI that this time needs feedback that the higher CQI index value conduct of probability of occurrence finally draws in the current feedback cycle;
If the current channel of variations characteristic present is non-Quick-Change channel, then the channel quality indication (CQI) information value of feedback of current feedback cycle is the correction value that the channel quality indication (CQI) information value of feedback of last feedback cycle draws by default principle correction.Wherein, comprise by default principle correction: obtain the desired value that the CQI index value of current feedback cycle and last feedback cycle obtains based on its probability of occurrence respectively; Calculate the difference between the desired value of CQI information index value of the desired value of CQI index value of current feedback cycle and last feedback cycle, i.e. the CQI desired value of the CQI desired value-last feedback cycle of the current feedback cycle of difference K=; With the CQI value of feedback of difference K and last feedback cycle and as the CQI value of feedback of current feedback cycle, be the CQI value of feedback+K of the CQI value of feedback=last feedback cycle of current feedback cycle, that is to say that the channel quality indication (CQI) information value of feedback of current feedback cycle is to revise the correction value that draws by difference K in the channel quality indication (CQI) information value of feedback of last feedback cycle.
Then, UE can be in the CQI value of feedback of the above-mentioned current feedback cycle that finally draws of feedback cycle due in feedback.
Table 1
| The variance of CQI (Dcqi) | The variations grade |
| Dcqi≤4 | In/slow, promptly non-fast |
| 4＜Dcqi | Hurry up |
Need to understand, in the present embodiment, the variations feature is determined by the variance of CQI index value, but is not limited thereto.
Owing to considered the complexity of channel actual conditions, revise CQI according to the variations feature, provide one more near the CQI feedback of actual channel condition, can provide decision-making foundation accurately for the AMC scheduling, thereby can reduce interference, improve the efficient and the throughput of the scheduling of system.
The present invention will be further described below by two application examples.
The feedback cycle of application example 1:CQI is Lcqi=5ms;
With 5ms is measurement period, measures the SINR numerical value of downlink traffic channel received signal, and obtains corresponding CQI index value, and (CQIi Pi) is: (10,0.2), (8,0.6), (12,0.2) to add up the probability that each CQI index value occurs;
Calculate the expectation E=6 of CQI in the current feedback cycle, variance D=9.62;
Judge that by table 1 current channel is a Quick-Change channel, thereby choose the CQI value of feedback of the highest CQI index value of probability of occurrence as current feedback cycle, from above-mentioned index value as can be known, the CQI probability of occurrence of numerical value 8 is 0.6, thereby CQI value of feedback=8.
UE is 8 at feedback cycle due in feedback CQI numerical value.
The feedback cycle of application example 2:CQI is Lcqi=10ms;
With 10ms is measurement period, measures the SINR numerical value of downlink traffic channel received signal, and obtains corresponding CQI index value, adds up the probability (CQIi that each CQI index value occurs, Pi) be: (10,0.5), (9,0.2), (8,0.1), (11,0.1), (12,0.1);
Calculate the expectation E=10 of CQI in the current feedback cycle, variance D=1;
Judge that by table 1 current channel is non-Quick-Change channel, thereby need revise the CQI value of feedback of last feedback cycle that calculated difference K at first supposes the CQI desired value E=9 of last feedback cycle to draw difference K=1 by default principle;
The last feedback of current feedback CQI=CQI+K;
UE feeds back the CQI value of feedback of following formula at the feedback cycle due in.
Adopt the method for the invention and device, compared with prior art, can access more accurately, near the CQI value of practical business channel received signal quality, for the AMC scheduling provides foundation accurately, thereby better guarantee the validity of AMC scheduling feature, promoted the throughput of system to greatest extent.The present invention can be applied to the LTE system, goes for equally having in the other system of similar problem.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, but this example of just lifting for ease of understanding should not think that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can make various possible being equal to and change or replacement, these changes or replacement all should belong to protection scope of the present invention.
Claims (10)
1. the feedback method of a channel quality indication (CQI) information is characterized in that, comprising:
Obtain the index value of the channel quality indication (CQI) information of current feedback cycle;
Determine current variations feature according to the index value of described channel quality indication (CQI) information;
Draw the channel quality indication (CQI) information value of feedback of current feedback cycle according to current variations feature.
2. the method for claim 1, it is characterized in that, the described channel quality indication (CQI) information value of feedback that draws current feedback cycle according to current variations feature comprises: the current channel of current variations characteristic present is non-Quick-Change channel, and then the channel quality indication (CQI) information value of feedback of current feedback cycle is the correction value that the channel quality indication (CQI) information value of feedback of last feedback cycle draws by default principle correction.
3. method as claimed in claim 2 is characterized in that, describedly comprises by default principle correction: obtain the desired value that the index value of the channel quality indication (CQI) information of current feedback cycle and last feedback cycle obtains based on probability of occurrence respectively; Calculate the difference between the desired value of channel quality indication (CQI) information index value of the desired value of channel quality indication (CQI) information index value of current feedback cycle and last feedback cycle; With the channel quality indication (CQI) information value of feedback of described difference and last feedback cycle and as the channel quality indication (CQI) information value of feedback of current feedback cycle.
4. the method for claim 1, it is characterized in that, the described channel quality indication (CQI) information value of feedback that draws current feedback cycle according to current variations feature comprises: the current channel of current variations characteristic present is a Quick-Change channel, and then the channel quality indication (CQI) information value of feedback of current feedback cycle is the highest index value of probability of occurrence in the index value of channel quality indication (CQI) information of current feedback cycle.
5. as each described method in the claim 1 to 4, it is characterized in that, described index value according to described channel quality indication (CQI) information determines that current variations feature comprises: the variance of calculating described channel quality indication (CQI) information index value based on the probability of occurrence of the index value of described channel quality indication (CQI) information, described variance and preset channel quality threshold are compared, when described variance smaller or equal to described preset channel quality threshold, determine that current channel is non-Quick-Change channel; When described variance greater than described preset channel quality threshold, determine that current channel is a Quick-Change channel.
6. method as claimed in claim 5 is characterized in that, obtains the index value of the channel quality indication (CQI) information of current feedback cycle by the Signal Interference and Noise Ratio of measuring the downlink traffic channel received signal.
7. method as claimed in claim 6 is characterized in that described method is applied to long evolving system.
8. the feedback device of a channel quality indication (CQI) information is characterized in that, comprising:
The channel quality indication (CQI) information acquisition module is used to obtain the index value of the channel quality indication (CQI) information of current feedback cycle;
Variations feature determination module is used for determining current variations feature according to the index value of described channel quality indication (CQI) information;
The channel quality indication (CQI) information feedback module is used for drawing according to current variations feature the channel quality indication (CQI) information value of feedback of current feedback cycle.
9. device as claimed in claim 8, it is characterized in that, described channel quality indication (CQI) information feedback module comprises according to the channel quality indication (CQI) information value of feedback that current variations feature draws current feedback cycle: the current channel of current variations characteristic present is non-Quick-Change channel, and then the channel quality indication (CQI) information value of feedback of current feedback cycle is the correction value that the channel quality indication (CQI) information value of feedback of last feedback cycle draws by default principle correction.
10. device as claimed in claim 8, it is characterized in that, described channel quality indication (CQI) information feedback module comprises according to the channel quality indication (CQI) information value of feedback that current variations feature draws current feedback cycle: the current channel of current variations characteristic present is a Quick-Change channel, and then the channel quality indication (CQI) information value of feedback of current feedback cycle is the highest index value of probability of occurrence in the index value of channel quality indication (CQI) information of current feedback cycle.
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| CN 201010149122 CN102215086B (en) | 2010-04-09 | 2010-04-09 | Channel quality indicator feedback method and device |
| PCT/CN2010/073391 WO2011124037A1 (en) | 2010-04-09 | 2010-05-31 | Feedback method and device for channel quality indicator |
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| CN 201010149122 CN102215086B (en) | 2010-04-09 | 2010-04-09 | Channel quality indicator feedback method and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103582148A (en) * | 2012-08-10 | 2014-02-12 | 中兴通讯股份有限公司 | Method and device for adjusting scheduling strategy and base station |
| WO2017166184A1 (en) * | 2016-03-31 | 2017-10-05 | 华为技术有限公司 | Method for determining channel quality indicator (cqi) index, user equipment, and base station |
| CN109922535A (en) * | 2017-12-12 | 2019-06-21 | 中国电信股份有限公司 | The more package transmission methods of data packet, reception device and computer readable storage medium |
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| CN1529448A (en) * | 2003-10-11 | 2004-09-15 | 中兴通讯股份有限公司 | Method for receiving mobile station reverse channel quality indicating channel of CDMA base station |
| CN1662097A (en) * | 2004-02-26 | 2005-08-31 | 三星电子株式会社 | Method and apparatus for controlling transmission of channel quality information |
| CN1809048A (en) * | 2006-02-16 | 2006-07-26 | 上海交通大学 | Simplified characterization method for channel quality feedback information |
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2010
- 2010-04-09 CN CN 201010149122 patent/CN102215086B/en not_active Expired - Fee Related
- 2010-05-31 WO PCT/CN2010/073391 patent/WO2011124037A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1529448A (en) * | 2003-10-11 | 2004-09-15 | 中兴通讯股份有限公司 | Method for receiving mobile station reverse channel quality indicating channel of CDMA base station |
| CN1662097A (en) * | 2004-02-26 | 2005-08-31 | 三星电子株式会社 | Method and apparatus for controlling transmission of channel quality information |
| CN1809048A (en) * | 2006-02-16 | 2006-07-26 | 上海交通大学 | Simplified characterization method for channel quality feedback information |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103582148A (en) * | 2012-08-10 | 2014-02-12 | 中兴通讯股份有限公司 | Method and device for adjusting scheduling strategy and base station |
| WO2017166184A1 (en) * | 2016-03-31 | 2017-10-05 | 华为技术有限公司 | Method for determining channel quality indicator (cqi) index, user equipment, and base station |
| CN109922535A (en) * | 2017-12-12 | 2019-06-21 | 中国电信股份有限公司 | The more package transmission methods of data packet, reception device and computer readable storage medium |
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| Publication number | Publication date |
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| CN102215086B (en) | 2013-11-06 |
| WO2011124037A1 (en) | 2011-10-13 |
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