CN102594512B - Continuous quality improvement (CQI) forecasting method based on channel reciprocity compensation and base station - Google Patents
Continuous quality improvement (CQI) forecasting method based on channel reciprocity compensation and base station Download PDFInfo
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Abstract
A continuous quality improvement (CQI) forecasting method based on channel reciprocity compensation and a base station belong to the technical field of wireless communication. The CQI forecasting method includes: inversely mapping CQI values fed back by a moving table to obtain signal-to-interference plus noise ratio (SINR) corresponding to the CQI values fed back by the moving table, and confirming the estimated values of the SINR at the current time; obtaining the estimated values of CQI at the current time according to the estimated values of the SINR at the current time through mapping, and judging a channel to be a fast-varying channel or a slow-varying channel according to stored CQI values fed back by the moving table with certain number and close to the estimated values of CQI at the current time and correspondingly obtained estimated values of CQI of the estimated values of CQI at the current time; and respectively confirming corresponding forecasting values of CQI of the slow-varying channel or the fat-varying channel. The CQI forecasting method uses channel reciprocity in a system, enhances relativity of forecasted CQI and CQI fed back by the moving table during scheduling, and ensures accuracy of the forecasted CQI during scheduling.
Description
Technical field
The present invention relates to a kind of CQI Forecasting Methodology and base station based on channel reciprocity compensation, belong to wireless communication technology field.
Background technology
In cell mobile communication systems, due to the movement of travelling carriage, channel presents time-varying characteristics, therefore need to adopt link adaptation techniques.In existing adaptive technique method, base station can be according to CQI (the Channel Quality Indicator of travelling carriage feedback, channel quality instruction) select best transmission block size and modulation system, but when travelling carriage feedback CQI, there is certain time delay, especially when in the situation of travelling carriage high-speed mobile, what this time delay showed will be more obvious, if base station directly selects transmission block size and modulation system to dispatch according to the CQI of travelling carriage feedback, variation that cannot adaptive channel, the CQI for example, using while scheduling is than the little decline that will cause throughput of system of the true CQI of current channel, if the CQI using when scheduling is larger than the true CQI of current channel, can cause the raising of Mobile Terminal errored block rate and cause the re-transmission of data, thereby cause larger time delay.
Summary of the invention
The invention provides a kind of CQI Forecasting Methodology and base station based on channel reciprocity compensation, the CQI using when solving base station scheduling in prior art and the true CQI of current channel exist gap to cause decline and the data re-transmission problem of throughput of system, and the present invention adopts following technical scheme for this reason:
The embodiment of the present invention provides a kind of CQI Forecasting Methodology based on channel reciprocity compensation, comprising:
The CQI value of base station receiving mobile feedback, the CQI value of described travelling carriage feedback is for obtaining according to predetermined mapping ruler mapping according to Signal to Interference plus Noise Ratio SINR;
Base station obtains the CQI value of described travelling carriage feedback the Signal to Interference plus Noise Ratio SINR corresponding to CQI value of described travelling carriage feedback according to the inverse mapping of predetermined mapping ruler, and the impulse response of channel and modifying factor estimate the estimated value of current time SINR when the CQI value of feeding back according to SINR corresponding to the CQI value of described travelling carriage feedback, the impulse response of current time channel, described travelling carriage;
Base station obtains the estimated value of current time CQI according to predetermined mapping ruler mapping according to the estimated value of the described current time SINR estimating;
Base station according to the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving with and the corresponding CQI estimated value obtaining judge described channel as Quick-Change channel or become slowly channel;
If be judged to be to become slowly channel, the predicted value using the estimated value of the described current time CQI obtaining as CQI; If be judged to be Quick-Change channel, by the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving using and the average that calculates according to special algorithm of the corresponding CQI estimated value obtaining as the predicted value of CQI.
The embodiment of the present invention also provides a kind of base station, comprising:
Receiver module, for the CQI value of receiving mobile feedback, the CQI value of described travelling carriage feedback is for obtaining according to predetermined mapping ruler mapping according to Signal to Interference plus Noise Ratio SINR;
Signal to Interference plus Noise Ratio determination module, obtain the Signal to Interference plus Noise Ratio SINR corresponding to CQI value of described travelling carriage feedback according to the inverse mapping of predetermined mapping ruler for the CQI value of travelling carriage feedback that described receiver module is received, and the impulse response of channel and modifying factor estimate the estimated value of current time SINR when the CQI value of feeding back according to SINR corresponding to the CQI value of described travelling carriage feedback, the impulse response of current time channel, described travelling carriage;
CQI estimation module, obtains the estimated value of current time CQI according to predetermined mapping ruler mapping for the estimated value of the described current time SINR that estimates according to described Signal to Interference plus Noise Ratio determination module;
Channel determination module, for according to the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving with and the corresponding CQI estimated value obtaining judge described channel as Quick-Change channel or become slowly channel;
CQI prediction module, if be judged to be to become slowly channel for channel determination module, the predicted value using the estimated value of the described current time CQI obtaining as CQI; If channel determination module is judged to be Quick-Change channel, by the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving using and the average that calculates according to special algorithm of the corresponding CQI estimated value obtaining as the predicted value of CQI.
The technical scheme that embodiment of the present invention provides is utilized the reciprocity of channel in system, base station compensates the CQI of travelling carriage feedback according to the relation of SINR and CQI, the CQI correlation of the CQI of prediction and travelling carriage feedback while having strengthened scheduling, pass through Quick-Change channel and the slow division that becomes channel, the accuracy of the CQI having predicted while having ensured scheduling simultaneously.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic flow sheet of a kind of CQI Forecasting Methodology based on channel reciprocity compensation of the present invention;
Fig. 2 is the structural representation of a kind of base station of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
A kind of CQI Forecasting Methodology based on channel reciprocity compensation that the specific embodiment of the present invention provides, as shown in Figure 1, comprising:
11, the CQI value of base station receiving mobile feedback, the CQI value of described travelling carriage feedback is for obtaining according to predetermined mapping ruler mapping according to Signal to Interference plus Noise Ratio SINR.
Particularly, predetermined mapping ruler can pass through link simulation, for example can be under varying environment, after fixation of C QI, provide SINR (Signal to Interference plus Noise Ratio, Signal Interference and Noise Ratio) and BLER (Block Error Rate, Block Error Ratio) relation curve, choose point that BLER is suitable as SINR corresponding to this fixation of C QI.Further, base station can be preserved the CQI of the travelling carriage feedback receiving.
12, base station obtains the CQI value of described travelling carriage feedback the Signal to Interference plus Noise Ratio SINR corresponding to CQI value of described travelling carriage feedback according to the inverse mapping of predetermined mapping ruler, and the impulse response of channel and modifying factor estimate the estimated value of current time SINR when the CQI value of feeding back according to SINR corresponding to the CQI value of described travelling carriage feedback, the impulse response of current time channel, described travelling carriage
Particularly, can be expressed as
Wherein, the CQI value of the travelling carriage feedback that CQI (n-1) expression base station receives, f
-1(CQI (n-1))=SINR (n-1) represents the CQI value of described travelling carriage feedback to obtain according to the inverse mapping of predetermined mapping ruler the SINR corresponding to CQI value of described travelling carriage feedback, β represents modifying factor, this modifying factor is generally determined by emulation or actual test, || h (n) || represent the norm of current time impulse response, || h (n-1) || the norm of the impulse response of channel while representing the CQI value of travelling carriage feedback.
13, base station obtains the estimated value of current time CQI according to predetermined mapping ruler mapping according to the estimated value of the described current time SINR estimating.
Particularly, base station is according to the estimated value of the described current time SINR estimating
obtain the estimated value of current time CQI according to predetermined mapping ruler mapping
?
further, base station also can be by the CQI of travelling carriage feedback receiving and the corresponding preservation of estimated value of the current time CQI estimating according to it.
14, base station according to the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving with and the corresponding CQI estimated value obtaining judge described channel as Quick-Change channel or become slowly channel.
Particularly, if the CQI value of the given number that the estimated value with current time CQI of preserving is close (W) travelling carriage feedback is respectively CQI (1), CQI (2), CQI (3) ... CQI (W), CQI estimated value is corresponding thereto respectively
above-mentioned two groups of data are arranged as according to the sequencing of time:
determine the number that changes breakover point in the sequence after arrangement and whether be greater than threshold value, if so, judge that described channel is as Quick-Change channel; If not, judge that described channel is as the slow channel that becomes; Described variation breakover point is that in the sequence after arranging, two the CQI values adjacent with this point are greater than this point simultaneously or are less than the CQI value of this point simultaneously.For example
larger than CQI (2), simultaneously
also larger than CQI (2), CQI (2) is for changing breakover point; Or, for example CQI (1) ratio
little, simultaneously CQI (2) also than
little,
for changing breakover point; Judge described channel as Quick-Change channel or become slowly channel by changing the number of breakover point and the magnitude relationship of threshold value in the sequence counting, general requirement and the actual channel quality etc. according to the accuracy to CQI prediction of threshold value determined.
If 15 are judged to be to become slowly channel, the predicted value using the estimated value of the described current time CQI obtaining as CQI; If be judged to be Quick-Change channel, by the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving using and the average that calculates according to special algorithm of the corresponding CQI estimated value obtaining as the predicted value of CQI.
Particularly, the average that specific algorithm calculates can be:
also can determine by weighting or other method.
In said method, as optionally comprising before execution step 14: whether the absolute value of the difference of the CQI value of the estimated value of current time CQI that judgement obtains and the travelling carriage of reception feedback is greater than predetermined value, if, the estimated value of the current time CQI obtaining is revised as the CQI value of travelling carriage feedback of reception and described predetermined value with, described predetermined value is determined by emulation.
Further, be owing to considering that CQI can fluctuate at short notice within the specific limits, therefore above-mentioned steps is that the estimated value of CQI is done to an amplitude limiting processing, so that the estimated value of CQI is closer to the CQI of real channel.
In said method, as optionally comprising after 15 in execution step: judge the predicted value of described CQI and last time the absolute value of the difference of the predicted value of CQI whether be greater than particular value, if, described in the predicted value of described CQI being revised as last time the predicted value of CQI and described particular value and, described particular value is determined by emulation.So that the predicted value of CQI is closer to the CQI of real channel.
The specific embodiment of the present invention also provides a kind of technical scheme of base station, as shown in Figure 2, comprising:
Receiver module 21, for the CQI value of receiving mobile feedback, the CQI value of described travelling carriage feedback is for obtaining according to predetermined mapping ruler mapping according to Signal to Interference plus Noise Ratio SINR.
Particularly, predetermined mapping ruler can pass through link simulation, for example can be under varying environment, after fixation of C QI, provide SINR (Signal to Interference plus Noise Ratio, Signal Interference and Noise Ratio) and BLER (Block Error Rate, Block Error Ratio) relation curve, choose point that BLER is suitable as SINR corresponding to this fixation of C QI.
Signal to Interference plus Noise Ratio determination module 22, obtain the Signal to Interference plus Noise Ratio SINR corresponding to CQI value of described travelling carriage feedback according to the inverse mapping of predetermined mapping ruler for the CQI value of travelling carriage feedback that described receiver module 21 is received, and the impulse response of channel and modifying factor estimate the estimated value of current time SINR when the CQI value of feeding back according to SINR corresponding to the CQI value of described travelling carriage feedback, the impulse response of current time channel, described travelling carriage.Particularly, the estimated value of the current time SINR estimating
can be expressed as
Wherein, the CQI value of the travelling carriage feedback that CQI (n-1) expression base station receives, f
-1(CQI (n-1))=SINR (n-1) represents the CQI value of described travelling carriage feedback to obtain according to the inverse mapping of predetermined mapping ruler the SINR corresponding to CQI value of described travelling carriage feedback, β represents modifying factor, this modifying factor is generally determined by emulation or actual test, || h (n) || represent the norm of current time impulse response, || h (n-1) || the norm of the impulse response of channel while representing the CQI value of travelling carriage feedback.
CQI estimation module 23, obtains the estimated value of current time CQI according to predetermined mapping ruler mapping for the estimated value of the described current time SINR that estimates according to described Signal to Interference plus Noise Ratio determination module 22.
Particularly, base station is according to the estimated value of the described current time SINR estimating
obtain the estimated value of current time CQI according to predetermined mapping ruler mapping
?
Channel determination module 24, for according to the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving with and the corresponding CQI estimated value obtaining judge described channel as Quick-Change channel or become slowly channel.
Particularly, if the CQI value of the given number that the estimated value with current time CQI of preserving is close (W) travelling carriage feedback is respectively CQI (1), CQI (2), CQI (3) ... CQI (W), CQI estimated value is corresponding thereto respectively
above-mentioned two groups of data are arranged as according to the sequencing of time:
determine the number that changes breakover point in the sequence after arrangement and whether be greater than threshold value, if so, judge that described channel is as Quick-Change channel; If not, judge that described channel is as the slow channel that becomes; Described variation breakover point is that in the sequence after arranging, two the CQI values adjacent with this point are greater than this point simultaneously or are less than the CQI value of this point simultaneously.For example
larger than CQI (2), simultaneously
also larger than CQI (2), CQI (2) is for changing breakover point; Or, for example CQI (1) ratio
little, simultaneously CQI (2) also than
little,
for changing breakover point; Judge described channel as Quick-Change channel or become slowly channel by changing the number of breakover point and the magnitude relationship of threshold value in the sequence counting, general requirement and the actual channel quality etc. according to the accuracy to CQI prediction of threshold value determined.
CQI prediction module 25, if be judged to be to become slowly channel for channel determination module 24, the predicted value using the estimated value of the described current time CQI obtaining as CQI; If channel determination module 24 is judged to be Quick-Change channel, by the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving using and the average that calculates according to special algorithm of the corresponding CQI estimated value obtaining as the predicted value of CQI.
Particularly, the average that specific algorithm calculates can be:
Can determine by weighting or other method.
Can also comprise as optional above-mentioned base station: CQI estimated value adjusting module, whether the absolute value for the difference that judges the CQI value that the estimated value of current time CQI that CQI estimation module 23 obtains and the travelling carriage of reception feed back is greater than predetermined value, if, the estimated value of the current time CQI obtaining is revised as the CQI value of travelling carriage feedback of reception and described predetermined value with, described predetermined value is determined by emulation.So that the estimated value of CQI is closer to the CQI of real channel.
Can also comprise as optional above-mentioned base station: CQI predicted value adjusting module, for judging whether the predicted value of the described CQI that CQI prediction module 25 predicts and the absolute value of the difference of the predicted value of CQI are last time greater than particular value, if, described in the predicted value of described CQI being revised as last time the predicted value of CQI and described particular value and, described particular value is determined by emulation.So that the predicted value of CQI is closer to the CQI of real channel.
Further, can also comprise preservation module, for the CQI of travelling carriage feedback and the corresponding preservation of estimated value of the current time CQI estimating by CQI estimation module 23 according to this CQI that receiver module 21 is received.
The specific implementation of the processing capacity of the each module comprising in above-mentioned base station is described in embodiment of the method before, is no longer repeated in this description at this.
It should be noted that, in above-mentioned base station embodiment, included modules is just divided according to function logic, but be not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional module also, just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
In addition, one of ordinary skill in the art will appreciate that all or part of step realizing in above-mentioned each embodiment of the method is can carry out the hardware that instruction is relevant by program to complete, corresponding program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the embodiment of the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
CQI Forecasting Methodology and base station based on channel reciprocity compensation that embodiment of the present invention provides are applicable to time division duplex (TDD, Time Division Duplexing) system, it utilizes the reciprocity of channel in system, base station can be compensated the CQI of travelling carriage feedback according to the relation of SINR and CQI, the CQI correlation of the CQI of prediction and travelling carriage feedback while having strengthened scheduling, pass through Quick-Change channel and the slow division that becomes channel, the accuracy of the CQI having predicted while having ensured scheduling simultaneously.Simultaneously by the amplitude limiting processing to CQI estimated value and CQI predicted value, CQI while making scheduling that base station dopes is more accurate, base station according to dope scheduling time CQI select best transmission block size and modulation system, ensure that base station can be according to the real-time change of channel Resources allocation accurately, thereby improved the throughput of system and the performance of system.
Claims (8)
1. the CQI Forecasting Methodology based on channel reciprocity compensation, is characterized in that, comprising:
The CQI value of base station receiving mobile feedback, the CQI value of described travelling carriage feedback is for obtaining according to predetermined mapping ruler mapping according to Signal to Interference plus Noise Ratio SINR;
Base station obtains the CQI value of described travelling carriage feedback the Signal to Interference plus Noise Ratio SINR corresponding to CQI value of described travelling carriage feedback according to the inverse mapping of predetermined mapping ruler, and the impulse response of channel and modifying factor estimate the estimated value of current time SINR when the CQI value of feeding back according to SINR corresponding to the CQI value of described travelling carriage feedback, the impulse response of current time channel, described travelling carriage;
Base station obtains the estimated value of current time CQI according to predetermined mapping ruler mapping according to the estimated value of the described current time SINR estimating;
Base station according to the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving with and the corresponding CQI estimated value obtaining judge described channel as Quick-Change channel or become slowly channel;
If be judged to be to become slowly channel, the predicted value using the estimated value of the described current time CQI obtaining as CQI; If be judged to be Quick-Change channel, by the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving using and the average that calculates according to special algorithm of the corresponding CQI estimated value obtaining as the predicted value of CQI;
Described base station according to the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving with and the corresponding CQI estimated value obtaining judge described channel as Quick-Change channel or become slowly channel, comprising:
If the CQI value of the travelling carriage feedback that the estimated value with current time CQI of the given number W finding out preservation is close is respectively CQI (1), CQI (2), CQI (3) ... CQI (W), CQI estimated value is corresponding thereto respectively
above-mentioned two groups of data are arranged as according to the sequencing of time:
determine the number that changes breakover point in the sequence after arrangement and whether be greater than threshold value, if so, judge that described channel is as Quick-Change channel; If not, judge that described channel is as the slow channel that becomes; Described variation breakover point is that in the sequence after arranging, two the CQI values adjacent with this point are greater than this point simultaneously or are less than the CQI value of this point simultaneously.
2. method according to claim 1, it is characterized in that, described base station obtains the CQI value of described travelling carriage feedback the Signal to Interference plus Noise Ratio SINR corresponding to CQI value of described travelling carriage feedback according to predetermined mapping ruler inverse mapping, and the impulse response of channel and modifying factor estimate the estimated value of current time SINR when the CQI value of feeding back according to SINR corresponding to the CQI value of described travelling carriage feedback, the impulse response of current time channel, described travelling carriage
comprise:
Wherein, the CQI value of the travelling carriage feedback that CQI (n-1) expression base station receives, f
-1(CQI (n-1))=SINR (n-1) represents the CQI value of described travelling carriage feedback to obtain according to the inverse mapping of predetermined mapping ruler the SINR corresponding to CQI value of described travelling carriage feedback, β represents modifying factor, || h (n) || represent the norm of current time impulse response, || h (n-1) || the norm of the impulse response of channel while representing the CQI value of travelling carriage feedback;
Described base station is according to the estimated value of the described current time SINR estimating
obtain the estimated value of current time CQI according to predetermined mapping ruler mapping
?
3. method according to claim 1, it is characterized in that, in base station according to the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving with and the corresponding CQI estimated value obtaining judge described channel as Quick-Change channel or before becoming channel slowly, also comprise:
Whether the absolute value of the difference of the CQI value of the estimated value of current time CQI that judgement obtains and the travelling carriage of reception feedback is greater than predetermined value, if, the estimated value of the current time CQI obtaining is revised as the CQI value of travelling carriage feedback of reception and described predetermined value with, described predetermined value is determined by emulation.
4. method according to claim 1, it is characterized in that, by the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving using and the average that calculates according to special algorithm of the corresponding CQI estimated value obtaining after the predicted value of CQI, also comprise:
Judge whether the predicted value of described CQI and the absolute value of the difference of the predicted value of CQI are last time greater than particular value, described in if so, the predicted value of described CQI being revised as last time the predicted value of CQI and described particular value with, described particular value is determined by emulation.
5. a base station, is characterized in that, comprising:
Receiver module, for the CQI value of receiving mobile feedback, the CQI value of described travelling carriage feedback is for obtaining according to predetermined mapping ruler mapping according to Signal to Interference plus Noise Ratio SINR;
Signal to Interference plus Noise Ratio determination module, obtain the Signal to Interference plus Noise Ratio SINR corresponding to CQI value of described travelling carriage feedback according to the inverse mapping of predetermined mapping ruler for the CQI value of travelling carriage feedback that described receiver module is received, and the impulse response of channel and modifying factor estimate the estimated value of current time SINR when the CQI value of feeding back according to SINR corresponding to the CQI value of described travelling carriage feedback, the impulse response of current time channel, described travelling carriage;
CQI estimation module, obtains the estimated value of current time CQI according to predetermined mapping ruler mapping for the estimated value of the described current time SINR that estimates according to described Signal to Interference plus Noise Ratio determination module;
Channel determination module, for according to the CQI value of the travelling carriage feedback of the close given number of the estimated value with current time CQI of preserving with and the corresponding CQI estimated value obtaining judge described channel as Quick-Change channel or become slowly channel;
CQI prediction module, if be judged to be to become slowly channel for channel determination module, the predicted value using the estimated value of the described current time CQI obtaining as CQI; If channel determination module is judged to be Quick-Change channel, the CQI value of the travelling carriage feedback of the given number that the estimated value with current time CQI of the preservation that the estimated value with current time CQI of given number found out being preserved is close is close using and the average that calculates according to special algorithm of the corresponding CQI estimated value obtaining as the predicted value of CQI;
Described channel determination module, if the CQI value of feeding back for the close travelling carriage of given number W the estimated value with current time CQI of preserving of finding out is respectively CQI (1), CQI (2), CQI (3) ... CQI (W), CQI estimated value is corresponding thereto respectively
above-mentioned two groups of data are arranged as according to the sequencing of time:
determine the number that changes breakover point in the sequence after arrangement and whether be greater than threshold value, if so, judge that described channel is as Quick-Change channel; If not, judge that described channel is as the slow channel that becomes; Described variation breakover point is that in the sequence after arranging, two the CQI values adjacent with this point are greater than this point simultaneously or are less than the CQI value of this point simultaneously.
6. base station according to claim 5, is characterized in that, described Signal to Interference plus Noise Ratio determination module estimates the estimated value of current time SINR
comprise:
Wherein, the CQI value of the travelling carriage feedback that CQI (n-1) expression base station receives, f
-1(CQI (n-1))=SINR (n-1) represents the CQI value of described travelling carriage feedback to obtain according to the inverse mapping of predetermined mapping ruler the SINR corresponding to CQI value of described travelling carriage feedback, β represents modifying factor, || h (n) || represent the norm of current time impulse response, || h (n-1) || the norm of the impulse response of channel while representing the CQI value of travelling carriage feedback;
Described CQI estimation module, the estimated value of the described current time SINR estimating for basis
obtain the estimated value of current time CQI according to predetermined mapping ruler mapping
?
7. base station according to claim 5, is characterized in that, also comprises:
CQI estimated value adjusting module, whether the absolute value for the difference that judges the CQI value that the estimated value of current time CQI that CQI estimation module obtains and the travelling carriage of reception feed back is greater than predetermined value, if, the estimated value of the current time CQI obtaining is revised as the CQI value of travelling carriage feedback of reception and described predetermined value with, described predetermined value is determined by emulation.
8. base station according to claim 5, is characterized in that, also comprises:
CQI predicted value adjusting module, whether the predicted value for the described CQI that judges CQI prediction module prediction is greater than particular value with the absolute value of the difference of the predicted value of CQI last time, if, described in the predicted value of described CQI being revised as last time the predicted value of CQI and described particular value and, described particular value is determined by emulation.
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| EP3678402A4 (en) * | 2017-09-01 | 2021-04-07 | Beijing Xiaomi Mobile Software Co., Ltd. | Method for determining cqi information, base station, and user equipment |
| CN109756310B (en) * | 2017-11-02 | 2020-10-20 | 北京大学 | CQI prediction method in LTE-A system |
| CN107994964B (en) * | 2017-11-30 | 2020-09-08 | 广州海格通信集团股份有限公司 | Channel interference sensing method, system, equipment, storage medium and base station |
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| CN102594512A (en) | 2012-07-18 |
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