CN101964702B - Method and system for analyzing CQI (Channel Quality Indicator) feedback - Google Patents
Method and system for analyzing CQI (Channel Quality Indicator) feedback Download PDFInfo
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Abstract
本发明公开了一种对CQI反馈进行分析的方法与系统。其中，该方法包括：确定LTE系统的CQI一致时间，所述CQI一致时间用于表征CQI时间变化的尺度；依据所述CQI一致时间，对所述LTE系统的CQI反馈进行分析，确定所述CQI反馈与处理时延、CQI反馈间隔以及不同时段内CQI的时变情况；对所述CQI反馈的有效性和合理性进行判断。本发明通过确定CQI一致时间，提供了分析和判断CQI反馈与处理时延、CQI反馈间隔以及其它任何时段内CQI时变情况的依据，进而能够很好的避免功率资源、频率资源和时间资源的浪费。
The invention discloses a method and system for analyzing CQI feedback. Wherein, the method includes: determining the CQI consistency time of the LTE system, the CQI consistency time being used to represent the scale of CQI time change; analyzing the CQI feedback of the LTE system according to the CQI consistency time, and determining the CQI Feedback and processing delay, CQI feedback interval, and CQI time-varying conditions in different time periods; and judging the validity and rationality of the CQI feedback. The present invention provides a basis for analyzing and judging CQI feedback and processing delay, CQI feedback interval, and CQI time-varying conditions in any other time period by determining the CQI consistent time, and then can well avoid power resources, frequency resources, and time resources. waste.
Description
Technical field
The present invention relates to the LTE communication technology, relate in particular to a kind of method and system that the CQI feedback is analyzed.
Background technology
In cellular communication system, the signal quality that the user receives depends on the interference level of channel quality, noise level and the neighbor cell of residential quarter.Under certain transmitting power, for capacity and the covering of optimization system, the data transfer rates of transmitter is wanted to mate the signal quality that UE receives, and namely the multiple data of sending in the good situation of signal quality that UE receives send data on the contrary less.This is because the modulation coding method of low order can resist higher interference and noise, but transmission rate is low; And the modulation coding method transmission rate of high-order is high, but responsive to interference and noise ratio.This technology namely is construed to be based on the link adaptation techniques of Adaptive Modulation and Coding.
In the LTE communication system, eNodeB selects suitable modulation system and code rate according to the CQI (Channel Quality Indicator) of UE feedback, to improve the throughput of transmission rate and system.CQI considers the signal noise ratio level of current channel and the performance of receiver, thus the indication of a kind of supported data rate that provides.CQI reports from the down link received signal quality and obtains, general measurement based on downlink reference signal.It should be noted that CQI is not that descending SINR directly indicates, but UE report under current channel and noise conditions, can guarantee to transmit Block Error Rate (BLER) and be no more than 10% the highest MCS.Particularly, the measurement of CQI is UE according to the SINR measured value of certain PRB group, finds out the 1st transmission of HARQ and can reach BLER less than 10% the highest MCS, then CQI Index corresponding to feedback.
The uplink and the eNodeB that it should be noted that CQI are depositing a fixed response time to the processing of CQI, it are generically and collectively referred to as CQI feedback and processing delay here.If in CQI feedback and processing delay, variation has occured in the actual CQI of UE end, will be so that have difference between the CQI that eNodeB uses and the real CQI of current time when carrying out link circuit self-adapting and scheduling.Channel or receiving terminal signal to noise ratio for rapid fading change faster situation of ratio, and UE probably faces the with it front upper diverse channel condition at quarter that gives the correct time.For the situation that channel improves, this will cause the waste of power or frequency resource, and for the situation that channel degenerates, probably cause the HARQ process, thereby cause the waste of time resource.Therefore, for since the problem that CQI feedback and processing delay cause must attach the importance.
On the other hand, channel is the parameter of describing the channel time-varying characteristics coherence time, and channel is provided for it because the information that relatively moves and become during the channel that causes between mobile terminal and the base station.In engineering, channel coherence time by maximum doppler frequency rule of thumb formula draw, and maximum doppler frequency is obtained divided by carrier wavelength by the speed of mobile terminal.Be channel be coherence time by the speed of mobile terminal rule of thumb formula obtain.The definition of channel coherence time has hinted that the signal that the two-way interval arrives coherence time will be subject to the different impact of channel.In LTE, the important evidence of the channel density that to be coherence time pilot tone arrange in time domain.But channel can not effectively expressing CQI seasonal effect in time series time-varying characteristics as a kind of tolerance of describing the channel variation speed coherence time.Therefore, be difficult to utilize channel to judge the situation of change of CQI in CQI feedback and the processing delay and determine rational CQI feedback interval coherence time.
Summary of the invention
The object of the present invention is to provide a kind of method and system that the CQI feedback is analyzed, to solve the problem owing to CQI feeds back and processing delay is caused.
On the one hand, a kind of method that the CQI feedback is analyzed of the present invention comprises the steps: the consistent time determining step of CQI, determines the consistent time of CQI of LTE system, and the consistent time of described CQI is used for characterizing the yardstick that the CQI time changes; Analytical procedure according to the consistent time of described CQI, is analyzed the CQI feedback of described LTE system, determines the time change situation of CQI in described CQI feedback and processing delay, CQI feedback interval and different period; Determining step is judged validity and the reasonability of described CQI feedback.
The above-mentioned method that the CQI feedback is analyzed, in the consistent time determining step of preferred described CQI, the consistent time T of described CQI
CQICTFor satisfying in period t, the CQI index changes the variation of caused corresponding efficient less than the probability of the thresholding M maximum t value more than or equal to R: T
CQICT=max (the corresponding efficiency change of t:P{CQI＜in the M|t time } 〉=R), wherein, M, R determine according to concrete engineering reality and demand.
On the other hand, a kind of system that the CQI feedback is analyzed of the present invention comprises: the consistent time determination module of CQI, analysis module and judge module.Wherein, the consistent time determination module of CQI is used for determining the consistent time of CQI of LTE system, and the consistent time of described CQI is used for characterizing the yardstick that the CQI time changes; Analysis module was used for according to the consistent time of described CQI, and the CQI feedback of described LTE system is analyzed, and determined the time change situation of CQI in described CQI feedback and processing delay, CQI feedback interval and different period; Judge module is used for validity and the reasonability of described CQI feedback are judged.
The above-mentioned system that the CQI feedback is analyzed, in the consistent time determination module of preferred described CQI, the consistent time T of described CQI
CQICTFor satisfying in period t, the CQI index changes the variation of caused corresponding efficient less than the probability of the thresholding M maximum t value more than or equal to R: T
CQICT=max (the corresponding efficiency change of t:P{CQI＜in the M|t time } 〉=R), wherein, M, R determine according to concrete engineering reality and demand.
The present invention becomes the foundation of situation by determining the consistent time of CQI when analysis and judgement CQI feedback and interior CQI of processing delay, CQI feedback interval and other any period are provided.And then, can be good at avoiding the waste of power resource, frequency resource and time resource.
Description of drawings
Fig. 1 is the present invention feeds back the embodiment of the method for analyzing to CQI flow chart of steps;
Fig. 2 is the present invention feeds back the system embodiment of analyzing to CQI structural representation.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
With reference to Fig. 1, Fig. 1 is the present invention feeds back the method for analyzing to CQI flow chart of steps, comprise the steps: CQI determining step S110 of consistent time, determine the consistent time of CQI of LTE system, the consistent time of described CQI is used for characterizing the yardstick that the CQI time changes; Analytical procedure S120 according to the consistent time of described CQI, analyzes the CQI feedback of described LTE system, determines the time change situation of CQI in described CQI feedback and processing delay, CQI feedback interval and different period; Determining step S130 judges validity and the reasonability of described CQI feedback.
The below makes detailed explanation to this embodiment.
Channel coherence time is larger, particularly during the translational speed as UE lower (be 5Hz such as Doppler frequency shift).But by emulation, even if be very easy to find in the situation that low speed moves, the time scale that CQI changes also will be come littlely more than channel coherence time.Simultaneously, can find also that the time scale that CQI changes is except outside the Pass the speed with the mobile terminal has, also relevant with the energy size of interchannel noise (or signal), under different signal to noise ratios, different variation speeds is revealed in the CQI sequence table.In addition, the time scale of CQI sequence variation is also relevant with Measurement bandwidth and the employed antenna mode of system of CQI.Therefore, it obviously is inadequate only using the concept of channel coherence time to analyze, and is necessary to define one and characterizes the amount that the CQI time changes yardstick, and we are called it " consistent time of CQI ", and have provided the definition of consistent time of CQI.
The definition of consistent time of CQI:
Satisfy in period t, the CQI index changes the variation of caused corresponding efficient less than the probability of the thresholding M maximum t value more than or equal to R, namely
T
CQICT=max (the corresponding efficiency change of t:P{CQI＜in the M|t time } 〉=R)
T wherein
CQICTNamely represent the consistent time of CQI (CQI Coherence Time), efficient corresponding to CQI index shown in last row of table 3, the actual information bit that carries for each RE.M in the middle of the definition and R can determine according to concrete engineering reality and demand.
The concept that the consistent time of CQI has been arranged just can use its some problems to the CQI feedback to analyze.For CQI feedback and processing delay, when CQI feedback and processing delay less than CQI during the consistent time, can think variation that the interior CQI of CQI feedback and processing delay changes caused efficient with greater than the possibility of probability R less than or equal to M.And when CQI feedback and processing delay greater than CQI during the consistent time, the variation that the CQI that may bring owing to time delay changes caused efficient greater than the possibility of M greater than R.For the CQI feedback interval, similar conclusion is arranged.
Technique effect of the present invention is: the concept of the consistent time of CQI by the present invention definition provides and has analyzed and judge CQI feedback and processing delay and the foundation of change situation during CQI in CQI feedback interval and other any period.
In one embodiment, set R=50%, M=0.4, the definition of consistent time of CQI is in period t like this, the CQI index change the variation of caused corresponding efficient less than 0.4 probability greater than 50% maximum t value.
Can calculate when this setting by emulation, the consistent time of the CQI under the particular dummy condition, as follows
Table 1 simulated conditions: the consistent time of CQI under the bandwidth 1.4M/6RB channel EPedA5Hz single antenna pattern
Table 2 simulated conditions: the consistent time of CQI under the bandwidth 1.4M/6RB channel EVehA70Hz single antenna pattern
Table 3CQI index and the corresponding table of modulation with coded system and efficient
On the other hand, the present invention also provides a kind of embodiment of the system that CQI feedback is analyzed, and with reference to Fig. 2, this system comprises: consistent time determination module 20 analysis modules 22 of CQI and judge module 24.Wherein:
The consistent time determination module 20 of CQI, for the consistent time of CQI of determining the LTE system, the consistent time of described CQI is used for characterizing the yardstick that the CQI time changes; Analysis module 22 was used for according to the consistent time of described CQI, and the CQI feedback of described LTE system is analyzed, and determined the time change situation of CQI in described CQI feedback and processing delay, CQI feedback interval and different period; Judge module 24 is used for validity and the reasonability of described CQI feedback are judged.
Wherein, in the consistent time determination module of described CQI, the consistent time T of described CQI
CQICTFor satisfying in period t, the CQI index changes the variation of caused corresponding efficient less than the probability of the thresholding M maximum t value more than or equal to R:
T
CQICT=max (the corresponding efficiency change of t:P{CQI＜in the M|t time } 〉=R),
M, R determine according to concrete engineering reality and demand.
Need to prove that the system embodiment that the CQI feedback is analyzed is identical with the embodiment of the method principle that the CQI feedback is analyzed, related content mutually with reference to getting final product, does not repeat them here each other.
More than a kind of method and system that CQI feedback is analyzed provided by the present invention are described in detail, used specific embodiment herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.
Claims (2)
1. the method that the CQI feedback is analyzed is characterized in that, comprises the steps:
The consistent time determining step of CQI is determined consistent time of CQI of LTE system, and the consistent time of described CQI is used for characterizing the yardstick that the CQI time changes;
Analytical procedure according to the consistent time of described CQI, is analyzed the CQI feedback of described LTE system, determines the time change situation of CQI in described CQI feedback and processing delay, CQI feedback interval and different period;
Determining step is judged validity and the reasonability of described CQI feedback;
In the consistent time determining step of described CQI, the consistent time T of described CQI
CQICTFor satisfying in period t, the CQI index changes the variation of caused corresponding efficient less than the probability of the thresholding M maximum t value more than or equal to R:
T
CQICT=max (the corresponding efficiency change of t:P{CQI＜in the M|t time } 〉=R)
Wherein, M, R determine according to concrete engineering reality and demand.
2. the system that the CQI feedback is analyzed is characterized in that, comprising:
The consistent time determination module of CQI, for the consistent time of CQI of determining the LTE system, the consistent time of described CQI is used for characterizing the yardstick that the CQI time changes;
Analysis module was used for according to the consistent time of described CQI, and the CQI feedback of described LTE system is analyzed, and determined the time change situation of CQI in described CQI feedback and processing delay, CQI feedback interval and different period;
Judge module is used for validity and the reasonability of described CQI feedback are judged;
In the consistent time determination module of described CQI, the consistent time T of described CQI
CQICTFor satisfying in period t, the CQI index changes the variation of caused corresponding efficient less than the probability of the thresholding M maximum t value more than or equal to R:
T
CQICT=max (the corresponding efficiency change of t:P{CQI＜in the M|t time } 〉=R),
Wherein, M, R determine according to concrete engineering reality and demand.
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| CN101615984A (en) * | 2009-08-07 | 2009-12-30 | 中兴通讯股份有限公司 | The method and apparatus of periodicity CQI feedback under the carrier aggregation |
| CN101741508A (en) * | 2008-11-11 | 2010-06-16 | 中兴通讯股份有限公司 | Method for obtaining and using CQI in LTE transmission mode 7 |
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| CN101615984A (en) * | 2009-08-07 | 2009-12-30 | 中兴通讯股份有限公司 | The method and apparatus of periodicity CQI feedback under the carrier aggregation |
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