CN104868977B - A kind of CQI modification methods and device - Google Patents
A kind of CQI modification methods and device Download PDFInfo
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- CN104868977B CN104868977B CN201510225091.3A CN201510225091A CN104868977B CN 104868977 B CN104868977 B CN 104868977B CN 201510225091 A CN201510225091 A CN 201510225091A CN 104868977 B CN104868977 B CN 104868977B
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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
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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 discloses CQI modification methods and devices, mainly include：Obtain the Block Error Rate of terminal；According to the Block Error Rate and block error probability desired value of the terminal, the Block Error Rate difference between the Block Error Rate of the terminal and the block error probability desired value is determined；According to the Block Error Rate difference of the terminal and the adjusting step of CQI correction values, this is determined for correcting the first CQI correction values of the CQI of the terminal；Used CQI correction values when correcting the CQI of the terminal according to the first CQI correction values and last time determine this for correcting the 2nd CQI correction values of the CQI of the terminal；The 2nd CQI correction values according to determining are modified the CQI of the terminal.Using this method, CQI in the prior art can be solved and there is the defects of cannot really reflecting present channel environment.
Description
Technical field
The present invention relates to wireless communication technique fields, more particularly relate to a kind of CQI modification methods and device.
Background technology
Long term evolution (Long-Term Evolution, LTE) is as 3rd generation mobile communication technology (3rd
Generation, 3G) technology evolution, the aerial access technology of 3G is improved and enhances, using Orthogonal Frequency Division Multiplexing
(Orthogonal Frequency Division Multiplexing, OFDM) and multiple-input and multiple-output (Multiple
Input Multiple Output, MIMO) etc. basic technology standard of the new technologies as its wireless network evolution.LTE system can
To provide the family service quality of the system ovelay range of higher user's peak-data rates, bigger and better cell edge
(Quality of Service, QoS) etc..
Channel quality instruction (Channel Quality Indicator, CQI) is the weight that terminal is reported to network side
Feedback information is wanted, is used to indicate present channel quality.Network side combination downlink transfer Block Error Rate (Block Error Ratio,
BLER suitable modulation and encoding scheme (Modulation and Coding are selected after) statistical result is modified CQI value
Scheme, MCS) grade dispatches the user.
In the scheme of the prior art one, in a CQI report cycle, network side can on the basis of the CQI that terminal reports,
Small range amendment is carried out according to the BLER of the downlink transfer of a period of time, has waited until the report cycle of next CQI, network side meeting
Using the newest CQI that terminal reports again as new benchmark.Based on this mode substantially completely relies on the CQI that terminal reports,
If the CQI that terminal reports is inaccurate, it can cause MCS grades that can not reflect true channel circumstance.
In order to solve the problems, such as the above-mentioned prior art one, in the scheme of the prior art two, network side is not used in terminal
Based on the CQI value of report, but on the basis of the CQI default values of initial setting up, corresponding tune is done according to downlink transfer BLER
It is whole, i.e., it is each one CQI value of terminal maintenance completely by network side, prevents the CQI value that terminal reports inaccurate and cause system
The waste of radio resource.But this mode fully relies on downlink transfer BLER to adjust CQI value, when terminal capabilities is in the presence of poor
There are moulds for different (for example there is a situation where fixed BLER under the conditions of certain) when either functional completeness is poor or feedback system
Paste property and when using conservative processing, can not accurately reflect wireless channel environment, blindly reduce MCS grades, lead to user
It perceives difference and larger waste is caused to system wireless resource, influence throughput of system.
In order to solve the problems, such as the above-mentioned prior art two, in the scheme of the prior art three, network side is according to downlink transfer
Practical BLER generated compared with BLER_TARGE one amendment step-length, the accumulated value of the amendment step-length in a period of time is added to
On the CQI that terminal reports, it is scheduled as revised CQI value to adjust MCS value.Although this mode terminal is reported and
Network operation value be combined so that CQI correct after earlier above two ways it is more accurate, but due to the use of correcting the tired of step-length
It is value added so that the variation of wireless environment is always lagged behind to the adjustment of CQI, can not reflect present channel environment in time.
Although in conclusion CQI correction techniques of the prior art the CQI that terminal reports is corrected or directly
The CQI reported without using terminal, but there is the defects of cannot really reflecting present channel environment in existing CQI.
Invention content
The embodiment of the present invention provides a kind of CQI modification methods and device, and to solve in the prior art, CQI presence cannot be true
The defects of real reflection present channel environment.
The embodiment of the present invention provides a kind of channel quality indicator (CQI) modification method, including：
Obtain the Block Error Rate of terminal；
According to the Block Error Rate and block error probability desired value of the terminal, the Block Error Rate of the terminal and the Block Error Rate are determined
Block Error Rate difference between desired value；
According to the Block Error Rate difference of the terminal and the adjusting step of CQI correction values, this is determined for correcting the end
The first CQI correction values of the CQI at end；
Used CQI correction values when correcting the CQI of the terminal according to the first CQI correction values and last time, really
Fixed the 2nd CQI correction values that this is used to correct the CQI of the terminal；
The 2nd CQI correction values according to determining are modified the CQI of the terminal.
Further, it is described according to the Block Error Rate difference of the terminal and the adjusting step of CQI correction values, determine this use
In the first CQI correction values for the CQI for correcting the terminal, specifically include：
This is determined according to equation below for correcting the first CQI correction values of the CQI of the terminal：
Wherein, CQI△It is used to correct the first CQI value of the CQI of the terminal, BLER for this△For Block Error Rate difference,
CQIstepFor the adjusting step of CQI correction values, CQImaxStep-length maximum value, CQI are corrected for CQIstepAnd CQImaxIt is preconfigured
Parameter,For rounding symbol, min { } is takes wherein minimum value.
Further, it is described the terminal was corrected according to the first CQI correction values and last time CQI when it is used
CQI correction values determine this for correcting the 2nd CQI correction values of the CQI of the terminal, specifically include：
This is determined according to equation below for correcting the 2nd CQI correction values of the CQI of the terminal：
Wherein, CQIaddIt is used to correct the second CQI value of the CQI of the terminal for this, α is smoothing factor, 0<α<1,
CQI△It is used to correct the first CQI correction values of the CQI of the terminal, CQI for thisoldFor the preceding CQI for once correcting the terminal
The 2nd CQI correction values.
Further, the 2nd CQI correction values that the basis is determined are modified the CQI of the terminal, including：
The CQI of the terminal is modified according to equation below：
CQIn=CQIn-1±CQIadd
Wherein, CQInFor this revised CQI value of the terminal, CQIaddIt is used to correct the of the CQI of terminal for this
Two CQI correction values；
If after this CQI reported of the terminal adjusts period arrival for a CQI, what the terminal reported for the first time
CQI, then CQIn-1The CQI value that this is reported for the terminal；
If after this CQI reported of the terminal adjusts period arrival for a CQI, what the terminal reported for the first time
CQI other than CQI, then CQIn-1For revised CQI value primary before the terminal.
Further, it further includes：
If in N number of BLER statistic period, the Block Error Rate between the Block Error Rate of the terminal and the block error probability desired value
Difference is positive number, then adjusts block error probability desired value according to equation below：
Wherein, BLER_TARGET be adjustment after block error probability desired value, TBLER[i]For in i-th of BLER statistic period
The obtained Block Error Rate of the terminal is counted, N is the quantity in BLER statistic period.
The embodiment of the present invention also provides a kind of channel quality indicator (CQI) correcting device, including：
Acquiring unit, for obtaining the Block Error Rate of terminal；
First determination unit for the Block Error Rate and block error probability desired value according to the terminal, determines the terminal
Block Error Rate difference between Block Error Rate and the block error probability desired value；
Second determination unit for the Block Error Rate difference and the adjusting step of CQI correction values according to the terminal, determines this
The first CQI correction values of the secondary CQI for being used to correct the terminal；
Third determination unit, for being made when correcting the CQI of the terminal according to the first CQI correction values and last time
CQI correction values determine this for correcting the 2nd CQI correction values of the CQI of the terminal；
Amending unit, for being modified according to the 2nd CQI correction values determined to the CQI of the terminal.
Further, second determination unit is specifically used for：This is determined according to equation below for correcting
The first CQI correction values of the CQI of the terminal：
Wherein, CQI△It is used to correct the first CQI value of the CQI of the terminal, BLER for this△For Block Error Rate difference,
CQIstepFor the adjusting step of CQI correction values, CQImaxStep-length maximum value, CQI are corrected for CQIstepAnd CQImaxIt is preconfigured
Parameter,For rounding symbol, min { } is takes wherein minimum value.
Further, third determination unit is specifically used for：This is determined according to equation below for correcting the terminal
The 2nd CQI correction values of CQI：
Wherein, CQIaddIt is used to correct the second CQI value of the CQI of the terminal for this, α is smoothing factor, 0<α<1,
CQI△It is used to correct the first CQI correction values of the CQI of the terminal, CQI for thisoldFor the preceding CQI for once correcting the terminal
The 2nd CQI correction values.
Further, the amending unit is specifically used for：
The CQI of the terminal is modified according to equation below：
CQIn=CQIn-1±CQIadd
Wherein, CQInFor this revised CQI value of the terminal, CQIaddIt is used to correct the of the CQI of terminal for this
Two CQI correction values；
If after this CQI reported of the terminal adjusts period arrival for a CQI, what the terminal reported for the first time
CQI, then CQIn-1The CQI value that this is reported for the terminal；
If after this CQI reported of the terminal adjusts period arrival for a CQI, what the terminal reported for the first time
CQI other than CQI, then CQIn-1For revised CQI value primary before the terminal.
Further, it is additionally operable to：
If in N number of BLER statistic period, the Block Error Rate between the Block Error Rate of the terminal and the block error probability desired value
Difference is positive number, then adjusts block error probability desired value according to equation below：
Wherein, BLER_TARGET be adjustment after block error probability desired value, TBLER[i]For in i-th of BLER statistic period
The obtained Block Error Rate of the terminal is counted, N is the quantity in BLER statistic period.
In the embodiment of the present invention, according to the Block Error Rate and block error probability desired value of the terminal, the mistake of the terminal is determined
Block Error Rate difference between block rate and the block error probability desired value, according to the Block Error Rate difference of the terminal and CQI correction values
Adjusting step, determine this for correct the terminal CQI the first CQI correction values, according to the first CQI correction values with
And last time used CQI correction values when correcting the CQI of the terminal, this is determined for correcting the of the CQI of the terminal
Two CQI correction values are modified the CQI of the terminal according to the 2nd CQI correction values determined.In this method, due to root
Determined according to the Block Error Rate of terminal and the difference of block error probability desired value for correct terminal CQI the first CQI correction values, so making
The variation of channel circumstance can be kept up with faster by obtaining the adjustment of the CQI of terminal；Institute is corrected according to the first CQI correction values and last time
The CQI correction values used during the CQI for stating terminal, determine the 2nd CQI correction values, can prevent a wide range of interior fluctuations of terminal CQI.It adopts
The CQI of terminal is modified in aforementioned manners, revised CQI can accurately reflect present channel environment.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only the embodiment of the present invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to the attached drawing of offer other
Attached drawing.
Fig. 1 is the position views of the CQI provided in the embodiment of the present invention in systems；
Fig. 2 is a kind of channel quality indicator (CQI) modification method flow chart provided in an embodiment of the present invention；
Fig. 3 is a kind of channel quality indicator (CQI) correcting device structure diagram provided in an embodiment of the present invention.
Specific embodiment
The preferred embodiment of the present invention is illustrated below in conjunction with Figure of description, it should be understood that described herein
Preferred embodiment is merely to illustrate and explain the present invention, and is not intended to limit the present invention.And in the absence of conflict, this Shen
Please in embodiment and embodiment in feature can be combined with each other.
The technical solution of the embodiment of the present invention can be applied to various communication systems, such as：Wideband code division multiple access
(Wideband Code Division Multiple Access, WCDMA), TD SDMA (Time Division
Synchronous Code Division Multiple Access, TD-SCDMA), LTE system etc..In WCDMA and TD-
In SCDMA systems, base station NodeB, base station control device is radio network controller (Radio Network
Controller, RNC)；In LTE system, base station is evolution base station (eNodeB), and base station control device is gateway
(Servicing Gateway, SGW) and mobile management entity (Mobile Management Entity, MME).It is of the invention real
It applies in example and be applicable in communication system is not limited.
CQI is one of most important Consideration of scheduling of resource and the measurement standard of eless channel communication quality.UE roots
CQI is obtained according to downlink reference signal measurement, is fed back to base station, base station is according to CQI, to complete the scheduling to downlink data.
The positions of CQI in systems are as shown in Figure 1, its information is physical layer signal, based on PUSCH (Physical
Uplink Shared Channel, physical uplink shared channel) or PUCCH (Physical Uplink Control
Channel, physical uplink control channel) it is sent.Detailed calculation process is presented as：
1) UE determines CQI, pre-coding matrix by being based on the algorithm of downlink reference signal (RS, Reference Signal)
The value of (Precoding Matrix Indicator, PMI), order instruction (Rank Index, RI), be then based on PUSCH or
The PUCCH feedback value is to base station.
2) value of the base station based on CQI, PMI, RI selects suitable MCS, code word (codeword) and PMI, then sends
These information are to UE.
3) UE measures channel quality by poll, is compared channel quality is received with the threshold value set, will be suitable
Data feedback to base station, base station carries out the correction of MCS, code word to carry out rational scheduling of resource according to these information.
It is CQI modification methods flow diagram provided in an embodiment of the present invention referring to Fig. 2, which performs in network side,
For example it can be performed by base station.As shown in the figure, the flow specifically includes following steps：
Step 101, the Block Error Rate of terminal is obtained；
Step 102, according to the Block Error Rate and block error probability desired value of the terminal, Block Error Rate and the institute of the terminal are determined
State the Block Error Rate difference between block error probability desired value；
Step 103, according to the Block Error Rate difference of the terminal and the adjusting step of CQI correction values, this is determined for repairing
The first CQI correction values of the CQI of just described terminal；
Step 104, used CQI is repaiied when correcting the CQI of the terminal according to the first CQI correction values and last time
Positive value determines this for correcting the 2nd CQI correction values of the CQI of the terminal；
Step 105, the CQI of the terminal is modified according to the 2nd CQI correction values determined.
Block Error Rate refers in the statistic period T of a Block Error Rate of setting, the data block for the reception that fails to terminal
It is counted, that is, in the statistic period T, by the sum of the number of the data block for the reception that fails and the data block of transmission
Compared to the Block Error Rate just obtained in statistic period T.
The size of Block Error Rate reflects the transmission of data blocks error rate of transmission channel, reflection be wireless environment quality,
If wireless environment is good, Block Error Rate is with regard to low, if conversely, wireless environment there is interference or signal quality is poor, Block Error Rate
In contrast it just increases.
In embodiments of the present invention, Block Error Rate can (ACK be according to ACK/NACK that terminal is fed back
The English abbreviation of Acknowledgement, i.e. confirmation message；The English letter that NACK is Negative Acknowledgement
Claim, i.e. unacknowledged information) it is calculated.Wherein, ACK/NACK has indicated that terminal is successful for which data block reception, which
Data block does not receive success.
Specifically, the formula of the Block Error Rate in statistic period T can be determined according to formula (1)：
In formula (1), CONTnackIt fails for the terminal in statistic period T shown in the NACK meanings of terminal feedback
The quantity of the data block of reception；CONTackFor the data being properly received in statistic period T shown in the ACK meanings of terminal feedback
The quantity of block.
In a step 102, Block Error Rate difference represents that Block Error Rate is relative to determining block error rate target in downlink traffic transmission
The situation of change of value, Block Error Rate difference can be determined according to formula (2)：
BLER△=TBLER-BLER_TARGET……………………(2)
Wherein, BLER_TARGET is block error probability desired value；BLER△For downlink Block Error Rate in statistic period T relative to
The increment of BLER_TARGET, i.e. Block Error Rate difference, TBLERFor the Block Error Rate in measurement period, can be calculated according to formula (1)
It arrives.
BLER_TARGET can be pre-set value, can also dynamically adjust, and dynamic adjusts the side of BLER_TARGET
Method is referring to subsequent descriptions.
In step 103, this can be determined according to equation below and is corrected for correcting the first CQI of the CQI of the terminal
Value：
Wherein, CQI△It is used to correct the first CQI value of the CQI of the terminal for this；BLER△It, can for Block Error Rate difference
It is calculated according to formula (2)；CQIstepFor the adjusting step of CQI correction values, the value of the step-length is pre-set；CQImaxFor
CQI corrects step-length maximum value, and the value of the maximum value can be pre-set.For rounding symbol, min { } is takes wherein minimum value.
Formula (3) represents：From the product of the adjusting steps of CQI correction values and Block Error Rate difference and CQI corrects step-length most
A minimum value, the first CQI correction values of the CQI as terminal are selected in big value.
At step 104, the 2nd CQI of CQI that this can be determined according to the following formula (4) for correcting the terminal is repaiied
Positive value：
Wherein, CQIaddIt is used to correct the second CQI value of the CQI of the terminal for this；α is smoothing factor, 0<α<1, the value
It can preset；CQIoldThe 2nd CQI correction values for the preceding CQI for once correcting the terminal；CQI△It is used to correct the end for this
The first CQI correction values of the CQI at end can be calculated according to formula (3).
Based on above-mentioned formula (4), smoothing factor can between 0 to 1 arbitrary value, so the smoothing factor according to configuration
The 2nd CQI correction values and the 2nd CQI correction values of the preceding CQI for once correcting the terminal that currently calculate are smoothed,
It can prevent a wide range of interior fluctuations of CQI.It should be noted that it can also be used other than smoothing factor in the embodiment of the present invention
Mode the 2nd CQI correction values of the 2nd CQI correction values that currently calculate and the preceding CQI for once correcting the terminal are carried out it is smooth
Processing, as long as the method used can play the role of preventing a wide range of interior fluctuations of CQI.
In step 105, the CQI of terminal can be modified according to equation below：
CQIn=CQIn-1±CQIadd…………………………(5)
Wherein, CQInFor this revised CQI value of the terminal, CQIn-1For the CQI after the preceding primary end correction
Value, CQIaddIt is used to correct the 2nd CQI correction values of the CQI of terminal for this.
In above-mentioned formula (5), if the value of Block Error Rate is positive value in statistic period T in formula (1), formula can be determined
(5) it is needed in CQIn-1Value is lowered, i.e., selection uses minus sign "-" number in formula (5)；If the statistics in formula (1)
The value of Block Error Rate is negative value in cycle T, then can determine to need to CQI in formula (5)n-1It is raised, i.e., in formula (5)
Selection uses plus sige "+" number.
A kind of application scenarios of the embodiment of the present invention are：The CQI adjustment periods are pre-set, within each CQI adjustment periods
The CQI that terminal reports is modified in the way of above-described embodiment.Within a CQI adjustment period, it will usually receive
The CQI that terminal is repeatedly fed back.Wherein, which adjusts the length in period and can be set as needed or be set according to Network status
Determine or require to set according to transmission performance, the invention is not limited in this regard.
Based on the scene, there are following two situations：
Situation 1：After a CQI adjustment period reaches, fed back for first time of the terminal within the CQI adjustment periods
CQI, when being modified using formula (5) to the CQI of terminal, what using terminal reported for the first time within this CQI adjustment periods
CQI value substitutes the CQI in formula (5)n-1。
Situation 2：Within a CQI adjustment period, in addition to the CQI that terminal reports for the first time, according to above-described embodiment
The flow of description is modified the CQI of terminal.
This period CQI value for reporting for the first time is started in each CQI adjustment periods, and a CQI adjustment week
Then using this method in phase, that is, it is applicable in last time modified CQI and this CQI correction value determined reports this
CQI is modified, in this way, within a CQI adjustment period, each CQI adjustment can make according to the CQI value after last time adjustment
Present channel environment can accurately be reflected by obtaining revised CQI, on the other hand, the beginning in period be adjusted in each CQI, for
The CQI that the terminal received for the first time in the period is fed back, using the CQI reported and the CQI correction values pair determined
The CQI reported is modified, i.e., is modified on the basis of the practical CQI reported of terminal, can improve the accuracy of CQI,
So as to more accurately reactive terminal current radio channel environment.
On the basis of the various embodiments described above of the present invention, a kind of preferred embodiment is：According to circumstances to the target of Block Error Rate
It is worth into Mobile state and adjusts.
Block Error Rate can be counted according to the BLER statistic period, correspondingly, can be every N number of in the embodiment of the present invention
The BLER statistic period according to circumstances adjusts block error probability desired value primary.
Specifically, if within N number of BLER statistic period, the Block Error Rate between the Block Error Rate and block error probability desired value of terminal
Difference is positive number, then can adjust block error probability desired value according to formula (6)：
In formula (6), BLER_TARGET be adjustment after block error probability desired value, TBLER[i]For i-th of BLER statistic week
The Block Error Rate of the terminal that statistics obtains in phase, can be calculated according to formula (1), and N is the quantity in BLER statistic period,
The quantity of N can be pre-configured with, and the time span in BLER statistic period can be pre-configured with.
It is adjusted by the desired value to Block Error Rate into Mobile state, can realize that function has certain lack to avoid due to terminal
It falls into or the feedback system of downlink data transmission is there are ambiguity, so as to cause there is fixed Block Error Rate value.According to
The desired value of dynamic adjustment Block Error Rate corrects CQI, and revised CQI can reflect true channel circumstance, be accorded with to terminal distribution
The MCS grades of actual channel environment before being fated.
Based on identical inventive concept, the embodiment of the present invention also provides a kind of channel quality indicator (CQI) correcting device.
As shown in figure 3, for a kind of channel quality indicator (CQI) correcting device structure diagram provided in an embodiment of the present invention.
The device mainly includes：Acquiring unit 21, the first determination unit 22, the second determination unit 23, third determination unit
24 and amending unit 25.
Acquiring unit 21, for obtaining the Block Error Rate of terminal；
First determination unit 22 for the Block Error Rate and block error probability desired value according to the terminal, determines the terminal
Block Error Rate and the block error probability desired value between Block Error Rate difference；
Second determination unit 23 for the Block Error Rate difference and the adjusting step of CQI correction values according to the terminal, determines
This is used for the first CQI correction values for correcting the CQI of the terminal；
Third determination unit 24, for correcting the CQI when institutes of the terminal according to the first CQI correction values and last time
The CQI correction values used determine this for correcting the 2nd CQI correction values of the CQI of the terminal；
Amending unit 25, for being modified according to the 2nd CQI correction values determined to the CQI of the terminal.
Preferably, second determination unit 23 is specifically used for：
This is determined according to formula (3) for correcting the first CQI correction values of the CQI of the terminal.
Preferably, third determination unit 24 is specifically used for：
This is determined according to formula (4) for correcting the 2nd CQI correction values of the CQI of the terminal.
Preferably, the amending unit 25 is specifically used for：
The CQI of the terminal is modified according to formula (5).
If preferably, in N number of BLER statistic period, between the Block Error Rate of the terminal and the block error probability desired value
Block Error Rate difference is positive number, then adjusts block error probability desired value according to formula (6).
The foregoing is merely the preferred embodiments of the application, are not limited to the application, all essences in the application
With within principle, any modification, equivalent replacement, improvement and so on should be included within the protection domain of the application god.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device of function specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps are performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or
The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although the preferred embodiment of the application has been described, those skilled in the art once know basic creation
Property concept, then additional changes and modifications may be made to these embodiments.So appended claims be intended to be construed to include it is excellent
It selects embodiment and falls into all change and modification of the application range.
Obviously, those skilled in the art can carry out the application essence of the various modification and variations without departing from the application
God and range.In this way, if these modifications and variations of the application belong to the range of the application claim and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
Claims (8)
1. a kind of channel quality indicator (CQI) modification method, which is characterized in that including：
Obtain the Block Error Rate of terminal；
According to the Block Error Rate and block error probability desired value of the terminal, the Block Error Rate of the terminal and the block error rate target are determined
Block Error Rate difference between value；
According to the Block Error Rate difference of the terminal and the adjusting step of CQI correction values, this is determined for correcting the terminal
The first CQI correction values of CQI, specifically include：
This is determined according to equation below for correcting the first CQI correction values of the CQI of the terminal：
Wherein, CQIΔIt is used to correct the first CQI correction values of the CQI of the terminal, BLER for thisΔFor Block Error Rate difference,
CQIstepFor the adjusting step of CQI correction values, CQImaxStep-length maximum value, CQI are corrected for CQIstepAnd CQImaxIt is preconfigured
Parameter,For rounding symbol, min { } is takes wherein minimum value；
Used CQI correction values when correcting the CQI of the terminal according to the first CQI correction values and last time, determine this
The 2nd CQI correction values of the secondary CQI for being used to correct the terminal；
The 2nd CQI correction values according to determining are modified the CQI of the terminal.
2. the method as described in claim 1, which is characterized in that described to be corrected according to the first CQI correction values and last time
Used CQI correction values during the CQI of the terminal determine this and are corrected for correcting the 2nd CQI of the CQI of the terminal
Value, specifically includes：
This is determined according to equation below for correcting the 2nd CQI correction values of the CQI of the terminal：
Wherein, CQIaddIt is used to correct the 2nd CQI correction values of the CQI of the terminal for this, α is smoothing factor, 0<α<1,
CQIΔIt is used to correct the first CQI correction values of the CQI of the terminal, CQI for thisoldFor the preceding CQI for once correcting the terminal
The 2nd CQI correction values.
3. the method as described in claim 1, which is characterized in that the 2nd CQI correction values that the basis is determined are to the end
The CQI at end is modified, including：
The CQI of the terminal is modified according to equation below：
CQIn=CQIn-1±CQIadd
Wherein, CQInFor this revised CQI value of the terminal, CQIaddIt is used to correct the 2nd CQI of the CQI of terminal for this
Correction value；
If this CQI reported of the terminal is the CQI that the terminal reports for the first time after a CQI adjusts period arrival, then
CQIn-1The CQI value that this is reported for the terminal；
If this CQI for reporting of the terminal is adjusted for a CQI after the period reaches, the CQI that the terminal reports for the first time with
Outer CQI, then CQIn-1For revised CQI value primary before the terminal.
4. method as claimed any one in claims 1 to 3, which is characterized in that further include：
If in N number of BLER statistic period, the Block Error Rate difference between the Block Error Rate of the terminal and the block error probability desired value
For positive number, then block error probability desired value is adjusted according to equation below：
Wherein, BLER_TARGET be adjustment after block error probability desired value, TBLER[i]To be counted in i-th of BLER statistic period
The Block Error Rate of the terminal arrived, N are the quantity in BLER statistic period.
5. a kind of channel quality indicator (CQI) correcting device, which is characterized in that including：
Acquiring unit, for obtaining the Block Error Rate of terminal；
First determination unit for the Block Error Rate and block error probability desired value according to the terminal, determines the mistake block of the terminal
Block Error Rate difference between rate and the block error probability desired value；
Second determination unit for the Block Error Rate difference and the adjusting step of CQI correction values according to the terminal, determines this use
In the first CQI correction values for the CQI for correcting the terminal；Second determination unit is specifically used for：
This is determined according to equation below for correcting the first CQI correction values of the CQI of the terminal：
Wherein, CQIΔIt is used to correct the first CQI correction values of the CQI of the terminal, BLER for thisΔFor Block Error Rate difference,
CQIstepFor the adjusting step of CQI correction values, CQImaxStep-length maximum value, CQI are corrected for CQIstepAnd CQImaxIt is preconfigured
Parameter,For rounding symbol, min { } is takes wherein minimum value；
Third determination unit, for correcting the CQI of the terminal according to the first CQI correction values and last time when, are used
CQI correction values determine this for correcting the 2nd CQI correction values of the CQI of the terminal；
Amending unit, for being modified according to the 2nd CQI correction values determined to the CQI of the terminal.
6. device as claimed in claim 5, which is characterized in that third determination unit is specifically used for：It is determined according to equation below
This is used for the 2nd CQI correction values for correcting the CQI of the terminal：
Wherein, CQIaddIt is used to correct the 2nd CQI correction values of the CQI of the terminal for this, α is smoothing factor, 0<α<1,
CQIΔIt is used to correct the first CQI correction values of the CQI of the terminal, CQI for thisoldFor the preceding CQI for once correcting the terminal
The 2nd CQI correction values.
7. device as claimed in claim 5, which is characterized in that the amending unit is specifically used for：
The CQI of the terminal is modified according to equation below：
CQIn=CQIn-1±CQIadd
Wherein, CQInFor this revised CQI value of the terminal, CQIaddIt is used to correct the 2nd CQI of the CQI of terminal for this
Correction value；
If this CQI reported of the terminal is the CQI that the terminal reports for the first time after a CQI adjusts period arrival, then
CQIn-1The CQI value that this is reported for the terminal；
If this CQI for reporting of the terminal is adjusted for a CQI after the period reaches, the CQI that the terminal reports for the first time with
Outer CQI, then CQIn-1For revised CQI value primary before the terminal.
8. the device as described in any one of claim 5 to 7, which is characterized in that be additionally operable to：
If in N number of BLER statistic period, the Block Error Rate difference between the Block Error Rate of the terminal and the block error probability desired value
For positive number, then block error probability desired value is adjusted according to equation below：
Wherein, BLER_TARGET be adjustment after block error probability desired value, TBLER[i]To be counted in i-th of BLER statistic period
The Block Error Rate of the terminal arrived, N are the quantity in BLER statistic period.
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| CN110266443B (en) * | 2019-08-07 | 2021-11-12 | 北京运安智维科技有限公司 | Self-adaptive adjustment method, system and device for trunking communication transmission mode |
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