CN104868977A - CQI modifying method and device - Google Patents

Abstract

The invention discloses a CQI modifying method and a CQI modifying device, wherein the method comprises the steps as follows: obtaining block error rate of a terminal; determining a block error rate difference value between the block error rate of the terminal and a block error rate target value according to the block error rate of the terminal and the block error rate target value; adjusting step length according to the block error rate difference value of the terminal and a CQI modification value, determining a first CQI modification value for modifying CQI of the terminal; determining a second CQI modification value for modifying the CQI of the terminal according to the first CQI modification value and the CQI modification value for modifying the CQI of the terminal last time; modifying the CQI of the terminal according to the determined second CQI modification value. The method of the invention can be used for avoiding the shortcoming that the CQI could not truly reflect current information channel environment in the prior art.

Description

A kind of CQI modification method and device

Technical field

The present invention relates to wireless communication technique field, relate to a kind of CQI modification method and device more specifically.

Background technology

Long Term Evolution (Long-Term Evolution, LTE) as G mobile communication (3rdGeneration, 3G) the evolution of technology, improve and enhance the aerial access technology of 3G, adopt OFDM (Orthogonal Frequency Division Multiplexing, OFDM) and the new technology such as multiple-input and multiple-output (Multiple Input Multiple Output, MIMO) as the basic technology standard of its wireless network evolution.LTE system can provide the family service quality (Quality of Service, QoS) etc. of higher user's peak-data rates, larger system ovelay range and better cell edge.

Channel quality instruction (Channel Quality Indicator, CQI) be terminal to report to network side important feedback information, be used to indicate present channel quality.Network side is in conjunction with Block Error Rate (the Block Error Ratio of downlink transfer, BLER) statistics revises the suitable modulation of rear selection and encoding scheme (Modulation and Coding Scheme, MCS) grade to dispatch this user to CQI value.

In the scheme of prior art one, in a CQI report cycle, network side can with the CQI of terminal to report for benchmark, BLER according to the downlink transfer of a period of time revises among a small circle, by the time the report cycle of next CQI, the up-to-date CQI that network side can report again with terminal is new benchmark.This mode relies on based on the CQI of terminal to report substantially completely, if the CQI of terminal to report is inaccurate, then MCS grade can be caused can not to reflect real channel circumstance.

In order to solve the problem of above-mentioned prior art one, in the scheme of prior art two, network side does not adopt based on the CQI value of terminal to report, but on the basis of the CQI default value of initial setting up, corresponding adjustment is done according to downlink transfer BLER, namely complete is each terminal maintenance CQI value by side, networking, prevents the CQI value of terminal to report inaccurate and causes the waste of system wireless resource.But this mode relies on downlink transfer BLER to adjust CQI value completely, when terminal capabilities there are differences, or (under such as certain condition, there is the situation of fixing BLER) when functional completeness is poor, or when there is ambiguity and adopt conservative process in feedback system, accurately can not reflect wireless channel environment, blindly reduce MCS grade, cause user awareness difference and larger waste caused to system wireless resource, influential system throughput.

In order to solve the problem of above-mentioned prior art two, in the scheme of prior art three, network side compares generation one according to actual BLER and the BLER_TARGE of downlink transfer and revises step-length, the accumulated value of the correction step-length in a period of time is added on the CQI of terminal to report, adjusts MCS value as revised CQI value and dispatch.Although after terminal to report and network operation value combine and make CQI revise by this mode, comparatively first two mode is more accurate, but owing to employing the accumulated value revising step-length, make the change adjustment of CQI always being lagged behind to wireless environment, present channel environment can not be reflected in time.

In sum, although the CQI of CQI correction technique of the prior art to terminal to report revises, or directly not using the CQI of terminal to report, there is the defect that truly can not reflect present channel environment in existing CQI.

Summary of the invention

The embodiment of the present invention provides a kind of CQI modification method and device, there is the defect that truly can not reflect present channel environment in order to solve CQI in prior art.

The embodiment of the present invention provides a kind of channel quality indicator (CQI) modification method, comprising:

Obtain the Block Error Rate of terminal;

According to Block Error Rate and the block error probability desired value of described terminal, determine the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value;

According to the Block Error Rate difference of described terminal and the adjustment step-length of CQI correction value, determine that this is for revising a CQI correction value of the CQI of described terminal;

The CQI correction value used according to a described CQI correction value and when revising the CQI of described terminal last time, determines that this is for revising the 2nd CQI correction value of the CQI of described terminal;

The 2nd CQI of CQI correction value to described terminal according to determining revises.

Further, described according to the Block Error Rate difference of described terminal and the adjustment step-length of CQI correction value, determine that this is for revising a CQI correction value of the CQI of described terminal, specifically comprises:

Determine that this is for revising a CQI correction value of the CQI of described terminal according to following formula:

Wherein, CQI _△for this is for revising first CQI value of the CQI of described terminal, BLER _△for Block Error Rate difference, CQI _stepfor the adjustment step-length of CQI correction value, CQI _maxfor CQI revises step-length maximum, CQI _stepand CQI _maxfor pre-configured parameter, for rounding symbol, min{} is for getting wherein minimum value.

Further, the described CQI correction value used according to a described CQI correction value and when revising the CQI of described terminal last time, determine that this is for revising the 2nd CQI correction value of the CQI of described terminal, specifically comprises:

Determine that this is for revising the 2nd CQI correction value of the CQI of described terminal according to following formula:

${\mathrm{CQI}}_{\mathrm{add}}=\frac{1}{\mathrm{\α}}{\mathrm{CQI}}_{\mathrm{old}}+(1-\frac{1}{\mathrm{\α}}){\mathrm{CQI}}_{\mathrm{\Δ}}$

Wherein, CQI _addfor this is for revising second CQI value of the CQI of described terminal, α is smoothing factor, 0< α <1, CQI _△for this is for revising a CQI correction value of the CQI of described terminal, CQI _oldfor front the 2nd CQI correction value once revising the CQI of described terminal.

Further, the 2nd CQI of CQI correction value to described terminal that described basis is determined revises, and comprising:

Revise according to the CQI of following formula to described terminal:

CQI _n＝CQI _n-1±CQI _add

Wherein, CQI _nfor this revised CQI value of described terminal, CQI _addfor this is for revising the 2nd CQI correction value of the CQI of terminal;

If this CQI reported of described terminal is after a CQI adjustment cycle arrival, the CQI that described terminal first time reports, then CQI _n-1for this CQI value reported of described terminal;

If this CQI reported of described terminal is after a CQI adjustment cycle arrival, the CQI beyond the CQI that described terminal first time reports, then CQI _n-1for once revised CQI value before described terminal.

Further, also comprise:

If in N number of BLER statistic cycle, the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value is positive number, then according to following formula adjustment block error probability desired value:

$\mathrm{BLER}\_\mathrm{TARGET}=\frac{\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{T}_{\mathrm{BLER}\left[i\right]}}{N}$

Wherein, BLER_TARGET is the block error probability desired value after adjustment, T _{bLER [i]}be the Block Error Rate adding up the described terminal obtained in i-th BLER statistic cycle, N is the quantity in BLER statistic cycle.

The embodiment of the present invention also provides a kind of channel quality indicator (CQI) correcting device, comprising:

Acquiring unit, for obtaining the Block Error Rate of terminal;

First determining unit, for according to the Block Error Rate of described terminal and block error probability desired value, determines the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value;

Second determining unit, for according to the Block Error Rate difference of described terminal and the adjustment step-length of CQI correction value, determines that this is for revising a CQI correction value of the CQI of described terminal;

3rd determining unit, for the CQI correction value used according to a described CQI correction value and when revising the CQI of described terminal last time, determines that this is for revising the 2nd CQI correction value of the CQI of described terminal;

Amending unit, for revising according to the 2nd CQI of CQI correction value to described terminal determined.

Further, described second determining unit specifically for: according to following formula determine this for revise

The one CQI correction value of the CQI of described terminal:

Wherein, CQI _△for this is for revising first CQI value of the CQI of described terminal, BLER _△for Block Error Rate difference, CQI _stepfor the adjustment step-length of CQI correction value, CQI _maxfor CQI revises step-length maximum, CQI _stepand CQI _maxfor pre-configured parameter, for rounding symbol, min{} is for getting wherein minimum value.

Further, the 3rd determining unit specifically for: determine that this is for revising the 2nd CQI correction value of the CQI of described terminal according to following formula:

${\mathrm{CQI}}_{\mathrm{add}}=\frac{1}{\mathrm{\&alpha;}}{\mathrm{CQI}}_{\mathrm{old}}+(1-\frac{1}{\mathrm{\&alpha;}}){\mathrm{CQI}}_{\mathrm{\&Delta;}}$

Wherein, CQI _addfor this is for revising second CQI value of the CQI of described terminal, α is smoothing factor, 0< α <1, CQI _△for this is for revising a CQI correction value of the CQI of described terminal, CQI _oldfor front the 2nd CQI correction value once revising the CQI of described terminal.

Further, described amending unit specifically for:

Revise according to the CQI of following formula to described terminal:

CQI _n＝CQI _n-1±CQI _add

Wherein, CQI _nfor this revised CQI value of described terminal, CQI _addfor this is for revising the 2nd CQI correction value of the CQI of terminal;

If this CQI reported of described terminal is after a CQI adjustment cycle arrival, the CQI that described terminal first time reports, then CQI _n-1for this CQI value reported of described terminal;

If this CQI reported of described terminal is after a CQI adjustment cycle arrival, the CQI beyond the CQI that described terminal first time reports, then CQI _n-1for once revised CQI value before described terminal.

Further, also for:

If in N number of BLER statistic cycle, the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value is positive number, then according to following formula adjustment block error probability desired value:

$\mathrm{BLER}\_\mathrm{TARGET}=\frac{\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{T}_{\mathrm{BLER}\left[i\right]}}{N}$

Wherein, BLER_TARGET is the block error probability desired value after adjustment, T _{bLER [i]}be the Block Error Rate adding up the described terminal obtained in i-th BLER statistic cycle, N is the quantity in BLER statistic cycle.

In the embodiment of the present invention, according to Block Error Rate and the block error probability desired value of described terminal, determine the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value, according to the Block Error Rate difference of described terminal and the adjustment step-length of CQI correction value, determine that this is for revising a CQI correction value of the CQI of described terminal, the CQI correction value used according to a described CQI correction value and when revising the CQI of described terminal last time, determine that this is for revising the 2nd CQI correction value of the CQI of described terminal, the 2nd CQI of CQI correction value to described terminal according to determining revises.In the method, owing to determining a CQI correction value of the CQI revising terminal according to the Block Error Rate of terminal and the difference of block error probability desired value, so make the adjustment of the CQI of terminal can catch up with the change of channel circumstance faster; The CQI correction value used according to a CQI correction value and when revising the CQI of described terminal last time, determines the 2nd CQI correction value, can prevent terminal CQI on a large scale in fluctuation.Adopt the CQI of said method to terminal to revise, revised CQI can reflect present channel environment accurately.

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.

The CQI position view in systems in which of Fig. 1 for providing in the embodiment of the present invention;

A kind of channel quality indicator (CQI) modification method flow chart that Fig. 2 provides for the embodiment of the present invention;

A kind of channel quality indicator (CQI) correcting device structural representation that Fig. 3 provides for the embodiment of the present invention.

Embodiment

Below in conjunction with Figure of description, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.And when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.

The technical scheme of the embodiment of the present invention, various communication system can be applied to, such as: Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, WCDMA), TD SDMA (Time Division Synchronous Code Division Multiple Access, TD-SCDMA), LTE system etc.In WCDMA and TD-SCDMA system, base station is NodeB, and 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).In the embodiment of the present invention, be suitable for communication system is not limited.

CQI is one of most important Consideration of scheduling of resource, is also the measurement standard of eless channel communication quality.UE obtains CQI according to downlink reference signal measurement, is fed back to base station, and the scheduling to downlink data, according to CQI, has been carried out in base station.

CQI position in systems in which as shown in Figure 1, its information is physical layer signal, based on PUSCH (Physical Uplink Shared Channel, physical uplink link shared channels) or PUCCH (Physical Uplink Control Channel, physical uplink control channel) send.Detailed calculation process is presented as:

1) UE passes through based on downlink reference signal (RS, Reference Signal) algorithm determine CQI, pre-coding matrix (Precoding Matrix Indicator, PMI), order instruction (Rank Index, RI) value, then based on PUSCH or this value of PUCCH feedback to base station.

2) suitable MCS, code word (codeword) and PMI are selected based on the value of CQI, PMI, RI in base station, then send these information to UE.

3) UE is by poll measure channel quality, the threshold value of receive channel quality and setting is compared, by suitable data feedback to base station, base station according to these information carry out MCS, code word correction to carry out rational scheduling of resource.

See Fig. 2, be the CQI modification method schematic flow sheet that the embodiment of the present invention provides, this flow process performs at network side, such as can be performed by base station.As shown in the figure, this flow process specifically comprises the following steps:

Step 101, obtains the Block Error Rate of terminal;

Step 102, according to Block Error Rate and the block error probability desired value of described terminal, determines the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value;

Step 103, according to the Block Error Rate difference of described terminal and the adjustment step-length of CQI correction value, determines that this is for revising a CQI correction value of the CQI of described terminal;

Step 104, the CQI correction value used according to a described CQI correction value and when revising the CQI of described terminal last time, determines that this is for revising the 2nd CQI correction value of the CQI of described terminal;

Step 105, the 2nd CQI of CQI correction value to described terminal according to determining revises.

Block Error Rate refers in the statistic period T of a Block Error Rate of setting, to terminal fail receive data block add up, that is, in this statistic period T, the number of data block received failing just obtains the Block Error Rate in statistic period T compared with the sum of the data block of transmission.

The size of Block Error Rate reflects the transmission of data blocks error rate of transmission channel, reflection be the quality of wireless environment, if wireless environment is good, then Block Error Rate is just low, otherwise if wireless environment exists interference or signal quality is poor, then Block Error Rate just uprises comparatively speaking.

In embodiments of the present invention, (ACK is the English abbreviation of Acknowledgement, i.e. confirmation to the Block Error Rate ACK/NACK that can feed back according to terminal; NACK is the English abbreviation of NegativeAcknowledgement, i.e. unacknowledged information) calculate.Wherein, which data block reception success ACK/NACK has indicated terminal pins to, and which data block does not receive successfully.

Particularly, the formula of the Block Error Rate in statistic period T can be determined according to formula (1):

$T_{\mathrm{BLER}}=\frac{{\mathrm{CONT}}_{\mathrm{nack}}}{{\mathrm{CONT}}_{\mathrm{nack}}+{\mathrm{CONT}}_{\mathrm{ack}}}\&times;100\%...\left(1\right)$

In formula (1), CONT _nackfor the terminal in statistic period T shown in the NACK indication of terminal feedback fails the quantity of data block received; CONT _ackfor the quantity of the data block successfully received in statistic period T shown in the ACK indication of terminal feedback.

In a step 102, Block Error Rate difference represents that in downlink traffic transmission, Block Error Rate is relative to the situation of change of the block error probability desired value determined, Block Error Rate difference can be determined according to formula (2):

BLER _△＝T _BLER-BLER_TARGET……………………(2)

Wherein, BLER_TARGET is block error probability desired value; BLER _△for Block Error Rate descending in statistic period T is relative to the increment of BLER_TARGET, i.e. Block Error Rate difference, T _bLERfor the Block Error Rate in measurement period, can calculate according to formula (1).

BLER_TARGET can be the value pre-set, also can dynamic conditioning, and the method for dynamic conditioning BLER_TARGET is see subsequent descriptions.

In step 103, can determine that this is for revising a CQI correction value of the CQI of described terminal according to following formula:

Wherein, CQI _△for this is for revising first CQI value of the CQI of described terminal; BLER _△for Block Error Rate difference, can calculate according to formula (2); CQI _stepfor the adjustment step-length of CQI correction value, the value of this step-length pre-sets; CQI _maxfor CQI revises step-length maximum, the value of this maximum can pre-set. for rounding symbol, min{} is for getting wherein minimum value.

Formula (3) represents: from the adjustment step-length of CQI correction value and the product of Block Error Rate difference and in CQI correction step-length maximum, select a minimum value, as a CQI correction value of the CQI of terminal.

At step 104, can determine that this is for revising the 2nd CQI correction value of the CQI of described terminal according to following formula (4):

${\mathrm{CQI}}_{\mathrm{add}}=\frac{1}{\mathrm{\&alpha;}}{\mathrm{CQI}}_{\mathrm{old}}+(1-\frac{1}{\mathrm{\&alpha;}}){\mathrm{CQI}}_{\mathrm{\&Delta;}}...\left(4\right)$

Wherein, CQI _addfor this is for revising second CQI value of the CQI of this terminal; α is smoothing factor, 0< α <1, and this value can preset; CQI _oldfor front the 2nd CQI correction value once revising the CQI of this terminal; CQI _△for this is for revising a CQI correction value of the CQI of this terminal, can calculate according to formula (3).

Based on above-mentioned formula (4), smoothing factor can between 0 to 1 any value, so according to the smoothing factor configured to the 2nd CQI correction value of current calculating and the front smoothing process of the 2nd CQI correction value once revising the CQI of this terminal, CQI can be prevented to fluctuate on a large scale.It should be noted that, also the mode except smoothing factor can be adopted in the embodiment of the present invention to the 2nd CQI correction value of current calculating and the front smoothing process of the 2nd CQI correction value once revising the CQI of this terminal, prevent the effect of CQI interior fluctuation on a large scale just passable as long as the method adopted can play.

In step 105, can revise according to the CQI of following formula to terminal:

CQI _n＝CQI _n-1±CQI _add…………………………(5)

Wherein, CQI _nfor this revised CQI value of described terminal, CQI _n-1for the CQI value after front once described end correction, CQI _addfor this is for revising the 2nd CQI correction value of the CQI of terminal.

In above-mentioned formula (5), if in the statistic period T in formula (1) value of Block Error Rate be on the occasion of, then can determine to need CQI in formula (5) _n-1value is lowered, i.e. choice for use minus sign "-" number in formula (5); If the value of Block Error Rate is negative value in the statistic period T in formula (1), then can determine to need CQI in formula (5) _n-1raise, i.e. choice for use plus sige "+" number in formula (5).

A kind of application scenarios of the embodiment of the present invention is: pre-set CQI adjustment cycle, and the CQI of mode to terminal to report according to above-described embodiment in each CQI adjustment cycle revises.In a CQI adjustment cycle, usually can receive the CQI that terminal is repeatedly fed back.Wherein, the length of this CQI adjustment cycle can set as required, or according to network condition setting, or requiring setting according to transmission performance, the present invention is not restricted this.

Based on this scene, there are following two kinds of situations:

Situation 1: after a CQI adjustment cycle arrives, for the CQI that the first time of terminal in this CQI adjustment cycle feeds back, when utilizing formula (5) CQI to terminal to revise, the CQI in the CQI value place of equation (5) using terminal first time in this CQI adjustment cycle to report _n-1.

Situation 2: in a CQI adjustment cycle, except the CQI that terminal first time reports, the CQI of flow process to terminal all described according to above-described embodiment revises.

The CQI value that first time in this cycle reports is used when each CQI adjustment cycle starts, then the method is adopted in a CQI adjustment cycle, namely last amended CQI is suitable for and this CQI correction value determined is revised the CQI that this reports, like this, in a CQI adjustment cycle, each CQI adjustment is according to the CQI value after adjustment last time, revised CQI can be made can to reflect present channel environment accurately, on the other hand, in the beginning of each CQI adjustment cycle, for the CQI that the terminal received for the first time in this cycle is fed back, the CQI adopting this to report and the CQI correction value determined are revised the CQI that this reports, namely with the actual CQI reported of terminal for benchmark is revised, the accuracy of CQI can be improved, thus can reactive terminal current radio channel environment more accurately.

On the basis of the various embodiments described above of the present invention, a kind of preferred version is: according to circumstances carry out dynamic conditioning to the desired value of Block Error Rate.

Block Error Rate can be added up according to the BLER statistic cycle, correspondingly, in the embodiment of the present invention, in every N number of BLER statistic cycle, according to circumstances can adjust once block error probability desired value.

Particularly, if within N number of BLER statistic cycle, the Block Error Rate difference between the Block Error Rate of terminal and block error probability desired value is positive number, then can adjust block error probability desired value according to formula (6):

$\mathrm{BLER}\_\mathrm{TARGET}=\frac{\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{T}_{\mathrm{BLER}\left[i\right]}}{N}...\left(6\right)$

In formula (6), BLER_TARGET is the block error probability desired value after adjustment, T _{bLER [i]}it is the Block Error Rate adding up the described terminal obtained in i-th BLER statistic cycle, can calculate according to formula (1), N is the quantity in BLER statistic cycle, and the quantity of N can be pre-configured, and the time span in BLER statistic cycle can be pre-configured.

By carrying out dynamic conditioning to the desired value of Block Error Rate, can avoid because terminal practical function exists certain defect, or there is ambiguity in the feedback system of downlink data transmission, thus cause the problem that there is fixing Block Error Rate value.According to the desired value correction CQI of dynamic conditioning Block Error Rate, revised CQI can reflect real channel circumstance, meets the MCS grade of current actual channel environment to terminal distribution.

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, be a kind of channel quality indicator (CQI) correcting device structural representation that the embodiment of the present invention provides.

This device mainly comprises: acquiring unit 21, the first determining unit 22, second determining unit the 23, three determining unit 24 and amending unit 25.

Acquiring unit 21, for obtaining the Block Error Rate of terminal;

First determining unit 22, for according to the Block Error Rate of described terminal and block error probability desired value, determines the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value;

Second determining unit 23, for according to the Block Error Rate difference of described terminal and the adjustment step-length of CQI correction value, determines that this is for revising a CQI correction value of the CQI of described terminal;

3rd determining unit 24, for the CQI correction value used according to a described CQI correction value and when revising the CQI of described terminal last time, determines that this is for revising the 2nd CQI correction value of the CQI of described terminal;

Amending unit 25, for revising according to the 2nd CQI of CQI correction value to described terminal determined.

Preferably, described second determining unit 23 specifically for:

Determine that this is for revising a CQI correction value of the CQI of described terminal according to formula (3).

Preferably, the 3rd determining unit 24 specifically for:

Determine that this is for revising the 2nd CQI correction value of the CQI of described terminal according to formula (4).

Preferably, described amending unit 25 specifically for:

Revise according to formula (5) CQI to described terminal.

Preferably, if in N number of BLER statistic cycle, the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value is positive number, then according to formula (6) adjustment block error probability desired value.

The foregoing is only the preferred embodiment of the application, be not limited to the application, within all spirit in the application and principle, any amendment done, equivalent replacement, improvement etc., within the protection range that all should be included in the application.

The application describes with reference to according to the flow chart of the method for the embodiment of the present application, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

Although described the preferred embodiment of the application, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the application's scope.

Obviously, those skilled in the art can carry out various change and modification to the application and not depart from the spirit and scope of the application.Like this, if these amendments of the application and modification belong within the scope of the application's claim and equivalent technologies thereof, then the application is also intended to comprise these change and modification.

Claims (10)

1. a channel quality indicator (CQI) modification method, is characterized in that, comprising:

Obtain the Block Error Rate of terminal;

According to Block Error Rate and the block error probability desired value of described terminal, determine the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value;

According to the Block Error Rate difference of described terminal and the adjustment step-length of CQI correction value, determine that this is for revising a CQI correction value of the CQI of described terminal;

The CQI correction value used according to a described CQI correction value and when revising the CQI of described terminal last time, determines that this is for revising the 2nd CQI correction value of the CQI of described terminal;

The 2nd CQI of CQI correction value to described terminal according to determining revises.

2. the method for claim 1, is characterized in that, described according to the Block Error Rate difference of described terminal and the adjustment step-length of CQI correction value, determines that this is for revising a CQI correction value of the CQI of described terminal, specifically comprises:

Determine that this is for revising a CQI correction value of the CQI of described terminal according to following formula:

Wherein, CQI _Δfor this is for revising first CQI value of the CQI of described terminal, BLER _Δfor Block Error Rate difference, CQI _stepfor the adjustment step-length of CQI correction value, CQI _maxfor CQI revises step-length maximum, CQI _stepand CQI _maxfor pre-configured parameter, for rounding symbol, min{} is for getting wherein minimum value.

3. the method for claim 1, it is characterized in that, the described CQI correction value used according to a described CQI correction value and when revising the CQI of described terminal last time, determine that this is for revising the 2nd CQI correction value of the CQI of described terminal, specifically comprises:

Determine that this is for revising the 2nd CQI correction value of the CQI of described terminal according to following formula:

${\mathrm{CQI}}_{\mathrm{add}}=\frac{1}{\mathrm{\&alpha;}}{\mathrm{CQI}}_{\mathrm{old}}+(1-\frac{1}{\mathrm{\&alpha;}}){\mathrm{CQI}}_{\mathrm{\&Delta;}}$

Wherein, CQI _addfor this is for revising second CQI value of the CQI of described terminal, α is smoothing factor, 0< α <1, CQI _Δfor this is for revising a CQI correction value of the CQI of described terminal, CQI _oldfor front the 2nd CQI correction value once revising the CQI of described terminal.

4. the method for claim 1, is characterized in that, the 2nd CQI of CQI correction value to described terminal that described basis is determined revises, and comprising:

Revise according to the CQI of following formula to described terminal:

CQI _n＝CQI _n-1±CQI _add

Wherein, CQI _nfor this revised CQI value of described terminal, CQI _addfor this is for revising the 2nd CQI correction value of the CQI of terminal;

If this CQI reported of described terminal is after a CQI adjustment cycle arrival, the CQI that described terminal first time reports, then CQI _n-1for this CQI value reported of described terminal;

If this CQI reported of described terminal is after a CQI adjustment cycle arrival, the CQI beyond the CQI that described terminal first time reports, then CQI _n-1for once revised CQI value before described terminal.

5. the method according to any one of Claims 1-4, is characterized in that, also comprises:

If in N number of BLER statistic cycle, the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value is positive number, then according to following formula adjustment block error probability desired value:

$\mathrm{BLER}\_\mathrm{TARGET}=\frac{\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{T}_{\mathrm{BLER}\left[i\right]}}{N}$

Wherein, BLER_TARGET is the block error probability desired value after adjustment, T _{bLER [i]}be the Block Error Rate adding up the described terminal obtained in i-th BLER statistic cycle, N is the quantity in BLER statistic cycle.

6. a channel quality indicator (CQI) correcting device, is characterized in that, comprising:

Acquiring unit, for obtaining the Block Error Rate of terminal;

First determining unit, for according to the Block Error Rate of described terminal and block error probability desired value, determines the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value;

Second determining unit, for according to the Block Error Rate difference of described terminal and the adjustment step-length of CQI correction value, determines that this is for revising a CQI correction value of the CQI of described terminal;

3rd determining unit, for the CQI correction value used according to a described CQI correction value and when revising the CQI of described terminal last time, determines that this is for revising the 2nd CQI correction value of the CQI of described terminal;

Amending unit, for revising according to the 2nd CQI of CQI correction value to described terminal determined.

7. device as claimed in claim 6, is characterized in that, described second determining unit specifically for:

Determine that this is for revising a CQI correction value of the CQI of described terminal according to following formula:

Wherein, CQI _Δfor this is for revising first CQI value of the CQI of described terminal, BLER _Δfor Block Error Rate difference, CQI _stepfor the adjustment step-length of CQI correction value, CQI _maxfor CQI revises step-length maximum, CQI _stepand CQI _maxfor pre-configured parameter, for rounding symbol, min{} is for getting wherein minimum value.

8. device as claimed in claim 6, is characterized in that, the 3rd determining unit specifically for: determine that this is for revising the 2nd CQI correction value of the CQI of described terminal according to following formula:

${\mathrm{CQI}}_{\mathrm{add}}=\frac{1}{\mathrm{\&alpha;}}{\mathrm{CQI}}_{\mathrm{old}}+(1-\frac{1}{\mathrm{\&alpha;}}){\mathrm{CQI}}_{\mathrm{\&Delta;}}$

Wherein, CQI _addfor this is for revising second CQI value of the CQI of described terminal, α is smoothing factor, 0< α <1, CQI _Δfor this is for revising a CQI correction value of the CQI of described terminal, CQI _oldfor front the 2nd CQI correction value once revising the CQI of described terminal.

9. device as claimed in claim 6, is characterized in that, described amending unit specifically for:

Revise according to the CQI of following formula to described terminal:

CQI _n＝CQI _n-1±CQI _add

Wherein, CQI _nfor this revised CQI value of described terminal, CQI _addfor this is for revising the 2nd CQI correction value of the CQI of terminal;

If this CQI reported of described terminal is after a CQI adjustment cycle arrival, the CQI that described terminal first time reports, then CQI _n-1for this CQI value reported of described terminal;

If this CQI reported of described terminal is after a CQI adjustment cycle arrival, the CQI beyond the CQI that described terminal first time reports, then CQI _n-1for once revised CQI value before described terminal.

10. the device according to any one of claim 6 to 9, is characterized in that, also for:

If in N number of BLER statistic cycle, the Block Error Rate difference between the Block Error Rate of described terminal and described block error probability desired value is positive number, then according to following formula adjustment block error probability desired value:

$\mathrm{BLER}\_\mathrm{TARGET}=\frac{\underset{i=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{T}_{\mathrm{BLER}\left[i\right]}}{N}$

Wherein, BLER_TARGET is the block error probability desired value after adjustment, T _{bLER [i]}be the Block Error Rate adding up the described terminal obtained in i-th BLER statistic cycle, N is the quantity in BLER statistic cycle.