CN102215086B - Channel quality indicator feedback method and device - Google Patents
Channel quality indicator feedback method and device Download PDFInfo
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- CN102215086B CN102215086B CN 201010149122 CN201010149122A CN102215086B CN 102215086 B CN102215086 B CN 102215086B CN 201010149122 CN201010149122 CN 201010149122 CN 201010149122 A CN201010149122 A CN 201010149122A CN 102215086 B CN102215086 B CN 102215086B
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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) channel quality of feedback, the resources such as disposal ability of UE, utilize adaptive coding and modulating (Adaptive Modulation and Coding, AMC) dynamically with most suitable time-frequency resource allocating to the user, improve to greatest extent the scheduling strategy of throughput of system.AMC refers to modulation system and the code rate of adaptive adjustment the transmission of data, and the influence of fading that causes to received signal due to channel variation with compensation, and then improve the signal-to-noise performance that receives signal finally obtains higher throughput of system.
In order to realize adaptive coding and modulating, need UE that channel quality indication (CQI) information (ChannelQuality Indicator, CQI) is fed back to the base station.Because 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 the decision-making foundation as the AMC scheduling at the SINR of a down receiving signal mass measurement of each feedback cycle foundation.but the downlink channel transmission quality of measuring due to UE and the CQI of feedback such as need to arrive at the report cycle to be feedback just can be sent, 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 too low SINR of the actual wireless channel time of reception, the modulation system of high-order in can't the demodulation descending scheduling, cause data receiver failure in this section period, thereby the CQI that can not give the feedback of CQI timely or feedback is inaccurate, so not only can increase the interference of whole system, also the acute variation of flow can appear, can not improve to greatest extent the disposal ability of system.
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, 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 by default principle correction: obtain respectively 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; 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 Quick-Change channel, 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, less than 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 Quick-Change channel when described variance.
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 downlink traffic channel reception 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 for the index value of the channel quality indication (CQI) information that obtains 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 for 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, 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 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 Quick-Change channel, and 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 the channel quality indication (CQI) information value of feedback be 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 present invention;
Fig. 2 is the flow chart of the feedback method of the embodiment of the present invention.
Embodiment
The below's contrast accompanying drawing also elaborates to the present invention 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.
Because foundation CQI index value carries out quantitative analysis, determine current mass change feature, thereby can draw the CQI value of feedback near current actual channel condition, decision-making foundation accurately can be provided for the scheduling of AMC, 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 for the index value of the channel quality indication (CQI) information that obtains 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 for draw the channel quality indication (CQI) information value of feedback of current feedback cycle according to current variations feature.
Said apparatus, suitable, can realize and be integrated in 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 present invention comprises:
1, measure the SINR (Signal Interference and Noise Ratio) of business receive channel in current feedback cycle and obtain corresponding CQI index value; Obtain the CQI index value for those skilled in the art's the technology of knowing according to SINR, for example can obtain by emulation the mapping relations of SINR and CQI, then draw corresponding CQI according to mapping relations by the SINR that measures; 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, according to the CQI in feedback cycle, calculate the probability distribution of its numerical value in feedback cycle; Also namely draw the probability of occurrence of each CQI index value in feedback cycle; (a plurality of CQI index values are arranged in a feedback cycle, refer to repeatedly measure in a 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, according to each CQI index value and probability of occurrence thereof, calculate expectation E and the variance D of the CQI index value in current feedback cycle;
4, according to the variance D of CQI, judge the variation grades of current channel, namely determine current variations feature; See table 1, (in 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, less than or equal to the preset channel quality threshold, determine that current channel is non-Quick-Change channel as variance D, comprise middle change or become slowly channel; Greater than the preset channel quality threshold, determine that current channel is Quick-Change channel as variance D; If the current channel of variations characteristic present is Quick-Change channel, choosing the CQI index value that in current feedback cycle, probability of occurrence is higher needs the CQI of feedback as this that finally draws;
If the current channel of variations characteristic present is non-Quick-Change channel, 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 respectively the desired value that the CQI index value of current feedback cycle and last feedback cycle obtains based on its probability of occurrence; 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 of the current feedback cycle of difference K=-last feedback cycle; 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, the channel quality indication (CQI) information value of feedback of current feedback cycle is to revise in the channel quality indication (CQI) information value of feedback of last feedback cycle the correction value that draws by difference K.
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, namely non-fast |
| 4＜Dcqi | Hurry up |
Need be appreciated that in the present embodiment, the variations feature is determined by the variance of CQI index value, but is not limited to this.
Due to the complexity of having considered the 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 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;
Take 5ms as measurement period, measure the SINR numerical value that downlink traffic channel receives signal, and obtain corresponding CQI index value, the probability (CQIi, Pi) of adding up each CQI index value appearance is: (10,0.2), (8,0.6), (12,0.2);
Calculate the expectation E=6 of CQI in current feedback cycle, variance D=9.62;
Be Quick-Change channel by the current channel of table 1 judgement, thereby choose the highest CQI index value of probability of occurrence as the CQI value of feedback of 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;
Take 10ms as measurement period, measure the SINR numerical value that downlink traffic channel receives signal, and obtain corresponding CQI index value, the probability (CQIi, Pi) of adding up each CQI index value appearance is: (10,0.5), (9,0.2), (8,0.1), (11,0.1), (12,0.1);
Calculate the expectation E=10 of CQI in current feedback cycle, variance D=1;
Be non-Quick-Change channel by the current channel of table 1 judgement, thereby need revise the CQI value of feedback of last feedback cycle by default principle that calculated difference K at first supposes the CQI desired value E=9 of last feedback cycle to draw difference K=1;
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 to greatest extent the throughput of system.The present invention can be applied to the LTE system, goes for equally having in the other system of Similar Problems.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, 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 replace, these changes or replacement all should belong to protection scope of the present invention.
Claims (5)
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, comprising:
Calculate the variance of 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, less than 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 Quick-Change channel when described variance;
Draw the channel quality indication (CQI) information value of feedback of current feedback cycle according to current variations feature, comprising:
The current channel of current variations characteristic present is non-Quick-Change channel, and 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;
The current channel of current variations characteristic present is Quick-Change channel, and 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.
2. the method for claim 1, is characterized in that, describedly comprises by default principle correction: obtain respectively 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; 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.
3. the method for claim 1, is characterized in that, the Signal Interference and Noise Ratio that receives signal by measuring downlink traffic channel obtains the index value of the channel quality indication (CQI) information of current feedback cycle.
4. method as claimed in claim 3, is characterized in that, described method is applied to long evolving system.
5. the feedback device of a channel quality indication (CQI) information, is characterized in that, comprising:
The channel quality indication (CQI) information acquisition module is for the index value of the channel quality indication (CQI) information that obtains 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, comprising:
Calculate the variance of 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, less than 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 Quick-Change channel when described variance;
The channel quality indication (CQI) information feedback module, be used for drawing according to current variations feature the channel quality indication (CQI) information value of feedback of current feedback cycle, comprise: the current channel of current variations characteristic present is non-Quick-Change channel, and 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; The current channel of current variations characteristic present is Quick-Change channel, and 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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| 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 |
| CN108781384A (en) * | 2016-03-31 | 2018-11-09 | 华为技术有限公司 | Method, user equipment and base station for determining channel quality indicator (CQI) index |
| 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 | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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