CN102377508A - Adaptive modulation and coding method and adaptive modulation and coding device - Google Patents

Adaptive modulation and coding method and adaptive modulation and coding device Download PDF

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Publication number
CN102377508A
CN102377508A CN2010102526884A CN201010252688A CN102377508A CN 102377508 A CN102377508 A CN 102377508A CN 2010102526884 A CN2010102526884 A CN 2010102526884A CN 201010252688 A CN201010252688 A CN 201010252688A CN 102377508 A CN102377508 A CN 102377508A
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cqi
report
terminal
mcs
nack
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CN102377508B (en
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王希维
姚春峰
张娟
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Xu Qiang
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ZTE Corp
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Priority to PCT/CN2010/079400 priority patent/WO2012019403A1/en
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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
    • 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
    • H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
    • H04L1/0035—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter evaluation of received explicit signalling
    • 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
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal

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  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

The invention discloses an adaptive modulation and coding method and an adaptive modulation and coding device. The adaptive modulation and coding method comprises the following steps of: firstly, under the condition that the reported CQI (Channel Quality Indicator) appears for the first time, recording the reported CQI, initializing parameters of the reported CQI, executing the second step and directly executing the second step under the condition that the reported CQI does not appear for the first time; secondly, updating the block error ratio of the CQI corresponding to ACK (Acknowledgement)/NACK (Negative Acknowledgement) according to the reported ACK/NACK and updating a modulation coding mode correction value and a status marker bit of the CQI corresponding to the ACK/NACK when the status marker bit of the CQI corresponding to the ACK/NACK is positioned in an instable state; and thirdly, under the condition that the status marker bit of the reported CQI is instable, acquiring a final MCS (Modulation and Coding Scheme) according to the reported CQI and the modulation coding mode correction value of the reported CQI; and under the condition that the status marker bit of the reported CQI is stable, determining the final MCS according to the reported CQI and the corresponding block error ratio of the reported CQI.

Description

Adaptive modulation coding method and device
Technical field
The present invention relates to field of mobile communication, particularly relate to a kind of adaptive modulation coding method and device.
Background technology
In correlation technique, long evolving system (Long Term Evolution abbreviates LTE as) is a third generation partner program (3 RdGeneration Partnershiop Project; Abbreviate 3GPP as) under the trend of mobile communication broad bandization; Insert (World interoperability for Microwave Access in order to resist worldwide interoperability for microwave; Abbreviate WiMAX as) etc. the market challenges of mobile broadband wireless access technology; Standard the 4th third-generation mobile communication technology of on the basis of ultra 3 g mobile communication system (Beyond Third Generation in mobile communication system abbreviates B3G as) technology, developing (Fourth Generation abbreviates 4G as).
LTE aloft interface aspect uses frequency division multiple access (Orthogonal Frequency Division Multiplexing; Abbreviate OFDM as) technology; Substituted long-term code division multiple access (the Code-Division Mutiple Access that uses of 3GPP; Abbreviate CDMA as) technology; And adopted multiple-input and multiple-output (Multiple Input Multiple Output abbreviates MIMO as) technology and adaptive technique to improve data transfer rate and systematic function in a large number, therefore become the core technology of systems such as following cell mobile communication systems, wireless broadband access system.
Adaptive Modulation and Coding (Adaptive Modulation and Coding abbreviates AMC as) is a kind of technology that changes modulation system and code check according to the variation of Real-time Channel situation.In the system that uses the AMC technology,, can use low-order-modulated mode and low code check, and, then can use high-order modulating and high code check for the good terminal of channel condition for the terminal of bad channel conditions.The AMC technology especially can improve the message transmission rate at the terminal of bad channel conditions, thereby can improve the average throughput of system.In addition, AMC is through changing modulation coding mode rather than the change through through-put power improves systematic function, having reduced the interference of system.
In correlation technique, down self-adapting modulation coding method and base station in a kind of ofdm system have been proposed, this method to the interference-to-noise ratio adjusted value, is adjusted corresponding modulation coding mode through the adjustment carrier wave.But; This method does not have to consider at different carrier waves interval to interference-to-noise ratio; Adjustment amount maybe condition of different, thus cause all possible carrier wave to the interference-to-noise ratio scope in, adjusted carrier wave maybe corresponding irrational modulation coding mode to interference-to-noise ratio.
In addition; Also comprise a kind of adaptive code modulation method in the prior art; In the method, according to the check results of CRC (Cyclic Redundancy Check abbreviates CRC as); The thresholding of real-time renewal modulation coding mode (Modulation and Coding Scheme abbreviates MCS as).But technique scheme is the taking into account system starting stage not; The initial value of MCS thresholding maybe with the incongruent situation of systematic function; Do not consider that various signals and interference plus noise are than (Signal to Interference plus Noise Ratio yet; Abbreviate SINR as) interval, the adjustment amount condition of different of MCS thresholding.
Can find out from above-mentioned two technical schemes; Adaptive code modulation method of the prior art exists because the ability rating at terminal is different, channel type is different and/or the unreasonable MCS selection that causes of adaptive modulation coding method is unreasonable, the terminal throughput performance is poor and the problem of Block Error Rate (Block Error Ratio abbreviates BLER as) index error.
Summary of the invention
The present invention provides a kind of adaptive modulation coding method and device, to solve that prior art exists because the ability rating at terminal is different, channel type is different and/or the unreasonable MCS that is caused of adaptive modulation coding method select unreasonable, the terminal throughput performance is poor and the problem of BLER index error.
The present invention provides a kind of adaptive modulation coding method, comprising:
Step 1, under the situation that the channel quality indicator (CQI) of confirming terminal to report occurs first, the CQI of record terminal to report; Parameter to the CQI of terminal to report is carried out initialization; And execution in step 2, under the non-situation about occurring first of the CQI that confirms terminal to report, direct execution in step 2; Wherein, above-mentioned parameter comprises: the Block Error Rate of state flag bit, modulation coding mode correction value, the modulation coding mode MCS that can select and the access times of each MCS;
Step 2; Positive acknowledgement ACK/ NACK NACK according to terminal to report; Upgrade the Block Error Rate of the CQI corresponding with ACK/NACK; And be under the situation of labile state at the state flag bit of the CQI corresponding with ACK/NACK, further upgrade modulation coding mode correction value and the state flag bit of the CQI corresponding, execution in step 3 with ACK/NACK;
Step 3; State flag bit at the CQI of terminal to report is under the unsettled situation; Modulation coding mode correction value according to the CQI of the CQI of terminal to report and terminal to report is obtained final MCS; Under the state flag bit of the CQI of terminal to report is stable situation, confirm final MCS according to the CQI of terminal to report and the pairing Block Error Rate of CQI of terminal to report.
The present invention also provides a kind of Adaptive Modulation and Coding device, comprising:
The CQI initialization module; Be used under the situation that the CQI that confirms terminal to report occurs first; The CQI of record terminal to report; Parameter to the CQI of terminal to report is carried out initialization, and wherein, parameter comprises: the Block Error Rate of state flag bit, modulation coding mode correction value, the modulation coding mode MCS that can select and the access times of each MCS;
CQI state update module; Be used for positive acknowledgement ACK/ NACK NACK according to terminal to report; Upgrade the Block Error Rate of the CQI corresponding with ACK/NACK; And be under the situation of labile state at the state flag bit of the CQI corresponding with ACK/NACK, further upgrade modulation coding mode correction value and the state flag bit of the CQI corresponding with ACK/NACK;
The MCS correcting module, the state flag bit that is used at the CQI of terminal to report is under the unsettled situation, obtains final MCS according to the modulation coding mode correction value of the CQI of the CQI of terminal to report and terminal to report;
MCS selects correcting module, is used for state flag bit at the CQI of terminal to report and is confirming final MCS according to the CQI of terminal to report and the pairing Block Error Rate of CQI of terminal to report under the stable situation.
Beneficial effect of the present invention is following:
The embodiment of the invention is added up different correction value Δ MCS through the CQI to terminal to report iSolved that the terminal reports different CQI accuracy different problems in the prior art, in addition, the embodiment of the invention is divided into initial condition and stable state with the state of CQI; Two states adopts different AMC flow processs down, thereby can select the suitable modulating coded system more accurately; The embodiment of the invention is through the BLER of each MCS under the statistics CQI, selects the maximum MCS that satisfies condition according to the BLER threshold value of setting, thereby can take into account the BLER performance and the maximum throughput performance of system; The embodiment of the invention according to the ACK/NACK that reports, is upgraded the BLER of the one group of MCS that satisfies condition, thereby can be shortened the time of initialization procedure when upgrading the BLER state of CQI.
Description of drawings
Fig. 1 is the flow chart of the adaptive modulation coding method of the embodiment of the invention;
Fig. 2 is the principle flow chart of the adaptive modulation coding method of the embodiment of the invention;
Fig. 3 is the flow chart of detailed process of the adaptive modulation coding method of the embodiment of the invention;
Fig. 4 is the structural representation of the Adaptive Modulation and Coding device of the embodiment of the invention.
Embodiment
In order to solve that prior art exists because the ability rating at terminal is different, channel type is different and/or the unreasonable MCS that causes of adaptive modulation coding method select unreasonable, the terminal throughput performance is poor and the problem of BLER index error; The invention provides a kind of adaptive modulation coding method and device; Below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, does not limit the present invention.
Method embodiment
According to embodiments of the invention, a kind of adaptive modulation coding method is provided, Fig. 1 is the flow chart of the adaptive modulation coding method of the embodiment of the invention, and is as shown in Figure 1, comprises following processing according to the adaptive modulation coding method of the embodiment of the invention:
Step 101 is under the situation that the channel quality of terminal to report indication (Channel Quality Indicator abbreviates CQI as) occurs first; The CQI of record terminal to report; Parameter to the CQI of terminal to report is carried out initialization, after executing initialization, and execution in step 102; Under the non-situation about occurring first of the CQI that confirms terminal to report; Direct execution in step 102, wherein, above-mentioned parameter comprises: whether this CQI gets into the access times of each MCS under Block Error Rate and this CQI of the state flag bit of stable state, modulation coding mode correction value that this CQI is corresponding, all MCS that this CQI can select down;
Particularly, in step 101, the parameter of the CQI of terminal to report is carried out initialization specifically comprises following processing:
1, the state flag bit in the parameter of the CQI that reports of initialization terminal is labile state (also can be called initial condition); Wherein, state flag bit comprises labile state and two kinds of values of stable state;
2, the modulation coding mode correction value corresponding in the parameter of the CQI that reports of initialization terminal with the CQI of terminal to report;
Particularly; If the CQI of terminal to report (that is to say for the CQI that first reports; This CQI is first in the record of the CQI of terminal to report), then the modulation coding mode correction value corresponding with the CQI of terminal to report is zero in the parameter of the CQI that reports of initialization terminal; If the CQI of terminal to report for be not first CQI that reports (promptly; In the record of the CQI of terminal to report; Other CQI have been write down before this CQI; The CQI that has write down is different with this CQI), the modulation coding mode correction value corresponding in the parameter of the CQI that then reports according to the pre-defined rule initialization terminal with the CQI of terminal to report, above-mentioned pre-defined rule comprises: confirm whether the existence flag bit is the CQI of stable state in the record; If exist; Then the computing mode flag bit is the mean value of the pairing modulation coding mode correction value of CQI of stable state, and after rounding downwards, the modulation coding mode correction value corresponding with the CQI of terminal to report is the value that obtains after this mean value rounds downwards in the parameter of the CQI that initialization terminal reports; If the existence flag bit is not the CQI of stable state; Then calculate the mean value of the pairing modulation coding mode correction value of all CQI except that the CQI of this record in the record; And after rounding downwards, the modulation coding mode correction value corresponding with the CQI of terminal to report is the value that obtains after this mean value rounds downwards in the parameter of the CQI that initialization terminal reports.
The Block Error Rate of the MCS that 3, can select in the parameter of the CQI that reports of initialization terminal;
Particularly, at first according to the mapping relations table of CQI and MCS initial value, the CQI of terminal to report is mapped as the MCS initial value; Subsequently; According to the pairing modulation coding mode correction value of the CQI of terminal to report the MCS initial value is revised in a predefined manner; Obtain revised MCS, wherein, the span of revised MCS is 0 to 28; Wherein, above-mentioned predetermined way comprises: with pairing modulation coding mode correction value of the CQI of terminal to report and the addition of MCS initial value; At last, the value j of MCS under the CQI of the terminal to report Block Error Rate from 0 to final MCS is initialized as 0, j under the CQI of terminal to report is initialized as 1 from the Block Error Rate of final MCS+1 to 28, wherein, the span of j is 0 to 28, the value of 29 kinds of MCS of expression.
4, the access times of each MCS are 1 in the parameter of initialization CQI.
Occur first if the CQI of terminal to report is non-, then directly jump to step 102.
Step 102; ACK/NACK according to terminal to report; Upgrade the Block Error Rate of the CQI corresponding with ACK/NACK; And be under the situation of labile state at the state flag bit of the CQI corresponding with ACK/NACK, further upgrade modulation coding mode correction value and the state flag bit of the CQI corresponding, execution in step 103 with ACK/NACK; That is to say, if the state flag bit CQI_state of the CQI of this ACK/NACK correspondence i=0, then upgrade the Δ MCS of this CQI iOtherwise if the CQI_state of the CQI of this ACK/NACK correspondence i=1, then jump to step 103.
Particularly, in step 102,, at first confirm CQI and the MCS corresponding, the frequency n that the CQI that record is corresponding with the ACK/NACK of terminal to report occurs with the ACK/NACK of terminal to report according to the ACK/NACK of terminal to report I1And the frequency n ack that reports NACK I1And under the calculating CQI corresponding with the ACK/NACK of terminal to report near the long segmentation Block Error Rate of the window of current subframe, wherein, CQI corresponding with the ACK/NACK of terminal to report and the value of MCS are respectively i1 and j1; The span of i is 0 to 15; The value of CQI in the expression 16, the span of j is 0 to 28, the value of 29 kinds of MCS of expression;
In step 102,, then upgrade the block error rate BLER of j=0～j1 under the CQI corresponding with the ACK of terminal to report if that terminal to report is ACK (i1, j)If, terminal to report be NACK, then upgrade the block error rate BLER of j=j1～28 under the CQI corresponding with the NACK of terminal to report (i1, j)
In the block error rate BLER of upgrading the CQI corresponding with ACK/NACK (i1, j)The time, at first confirm to upgrade BLER (i1, j)Pairing MCS, and the access times Times of definite this MCS (i1, j)Whether smaller or equal to the threshold value N that is provided with in advance, if then upgrade BLER according to formula 1 (i1, j), and to having upgraded BLER (i1, j)The Times of all MCS (i1, j)Add 1; Otherwise, upgrade BLER according to formula 2 (i1, j)
BLER ( i 1 , j ) = BLER ( i 1 , j ) * Times ( i 1 , j ) + NACK Times ( i 1 , j ) + 1 Formula 1
BLER ( i 1 , j ) = 1 + ( N - 1 ) BLER ( i 1 , j ) N , NACK = 1 ( N - 1 ) BLER ( i 1 , j ) N , NACK = 0 Formula 2
Wherein, in formula 1, when terminal to report be ACK the time, NACK=0, when terminal to report be NACK the time, NACK=1.
In addition, in step 102, be under the situation of labile state at the state flag bit of the CQI corresponding with ACK/NACK, also need further to upgrade modulation coding mode correction value and the state flag bit of the CQI corresponding with ACK/NACK, particularly:
Frequency n in the CQI appearance corresponding with the ACK/NACK of terminal to report I1Smaller or equal to the threshold value n that is provided with in advance 0And report the frequency n ack of NACK I1Smaller or equal to the threshold value nack that is provided with in advance 0Situation under, the modulation coding mode correction value Δ MCS of the CQI corresponding with ACK/NACK I1Constant;
Frequency n in the CQI appearance corresponding with the ACK/NACK of terminal to report I1Greater than the threshold value n that is provided with in advance 0And report the frequency n ack of NACK I1Smaller or equal to the threshold value nack that is provided with in advance 0Situation under, Δ MCS I1Constant, the state flag bit CQI_state of the CQI corresponding with ACK/NACK I1=1;
Except that above-mentioned two kinds of situation, Δ MCS I1Subtract 1, n I1=0, nack I1=0.
Step 103; State flag bit at the CQI of terminal to report is under the unsettled situation; Modulation coding mode correction value according to the CQI of the CQI of terminal to report and terminal to report is obtained final MCS; Under the state flag bit of the CQI of terminal to report is stable situation, confirm final MCS according to the CQI of terminal to report and the pairing Block Error Rate of CQI of terminal to report.
That is to say, if the CQI_state of the CQI that reports i=0, the modulation coding mode correction value Δ MCS according to the CQI that reports and this CQI obtains final modulation coding mode MCSfinal.If the CQI_state of the CQI that reports i=1, according to the CQI that reports, select the corresponding BLER of this CQI (i, j)Less than the j of the maximum that equals a certain threshold value, according to the segmentation BLER under this CQI, the j value is revised again in (j=0～28).The final modulation coding mode MCSfinal that j promptly obtains.
Particularly, be under the unsettled situation at the state flag bit of the CQI of terminal to report, at first according to the mapping relations table of CQI and MCS initial value, the value i2 of the CQI of terminal to report is mapped as the MCS initial value; Subsequently, according to the pairing modulation coding mode correction value of the CQI of terminal to report Δ MCS I2The MCS initial value is revised in a predefined manner, obtained final MCS; Wherein, above-mentioned predetermined way comprises: with pairing modulation coding mode correction value of the CQI of terminal to report and the addition of MCS initial value.
Under the state flag bit of the CQI of terminal to report is stable situation, at first select the pairing block error rate BLER of CQI of terminal to report (i2, j)In, smaller or equal to the j of the maximum of predetermined threshold value; Subsequently, according to the segmentation Block Error Rate under the CQI of terminal to report, judge that whether the segmentation Block Error Rate is less than the thresholding BLER that is provided with in advance LowIf, be judged as and be, then j adds 1, otherwise j is constant; At last, confirm final MCS according to the value of j.
Fig. 2 is the principle flow chart of the adaptive modulation coding method of the embodiment of the invention, and is as shown in Figure 2, comprises following processing:
Step 201 judges whether the CQI of terminal to report occurs for the first time, if be judged as is, then execution in step 202, otherwise, direct execution in step 203;
The state parameter that the CQI that step 202, initialization terminal report is corresponding, execution in step 203;
Step 203, BLER and the modulation coding mode correction value of the CQI that the ACK/NACK of renewal terminal to report is corresponding, execution in step 204;
Step 204 judges whether the CQI of terminal to report gets into stable state, if be judged as is, then execution in step 205, otherwise, execution in step 206;
Step 205 is selected modulation coding mode;
Step 206 is upgraded the modulation coding mode correction value of this CQI, selects modulation coding mode.
Can find out that from above-mentioned processing the CQI through to terminal to report adds up different correction value Δ MCS i, solved that the terminal reports different CQI accuracy different problems in the prior art;
Be divided into initial condition and stable state through the state with CQI, two states adopts different AMC flow processs down, can select the suitable modulating coded system more accurately;
Through the BLER of each MCS under the statistics CQI, select the maximum MCS that satisfies condition according to the BLER threshold value of setting, thereby can take into account the BLER performance and the maximum throughput performance of system;
Through when upgrading the BLER state of CQI, according to the ACK/NACK that reports, upgrade the BLER of the one group of MCS that satisfies condition, thereby can shorten the time of initialization procedure.
Below in conjunction with accompanying drawing, the technical scheme of the embodiment of the invention is carried out detailed explanation.
Fig. 3 is the flow chart of detailed process of the adaptive modulation coding method of the embodiment of the invention, at first, supposes that i representes the value of 16 kinds of CQI, and its span is 0～15, and j representes the value of 29 kinds of MCS, and its span is 0～28.As shown in Figure 3, comprise following processing:
Step 301 if the CQI of terminal to report occurs for the first time, then writes down this CQI, and four kinds of parameters of this CQI of initialization.The concrete processing as follows:
Step 1, whether this CQI of initialization gets into the flag bit CQI_state of stable state i=0, this flag bit equals 0 this CQI of expression and is in initial condition (that is, above-mentioned labile state), equals 1 this CQI of expression and is in stable state;
Step 2, the corresponding modulation coding mode correction value Δ MCS of this CQI of initialization i
If the CQI that reports is first CQI, then Δ MCS i=0, otherwise Δ MCS iValue undertaken by following rule: seek whether existence value and be 1 CQI_state i, if exist, the Δ MCS that these CQI are corresponding iAveraging rounds downwards again, and this is worth as Δ MCS iIf not having value is 1 CQI_state i, then according to the CQI that has write down, the Δ MCS that the CQI that had occurred before is corresponding iAveraging rounds downwards again, and this is worth as Δ MCS i
Step 3, the block error rate BLER of all MCS that this CQI of initialization possibly select down (i, j)
1,, the value of channel quality indicator (CQI) is mapped as modulation coding mode initial value MCSinit according to CQI-MCSinit mapping relations table;
2, with the corresponding correction value Δ MCS of this CQI iMCSinit revises to the modulation coding mode initial value, obtains modulation coding mode MCSfinal (that is, above-mentioned revised MCS), and limited field is 0～28; Makeover process carries out as follows: with Δ MCS iWith modulation coding mode initial value MCSinit addition;
3, with the value of j under this CQI BLER from 0 to MCSfinal (i, j)Be initialized as 0, the value of j is from the BLER of MCSfinal+1 to 28 (i, j)Be initialized as 1.
Step 4, the access times Times of each MCS under this CQI of initialization (i, j)So Times of j from 0 to 28 (i, j)Be initialized as 1.
If the CQI of terminal to report occurs for the first time, then jump to step 302.
Step 302 according to the value of ACK/NACK, is upgraded the BLER of the corresponding CQI of ACK/NACK (i, j)And/or Δ MCS i
Step 1 is upgraded the BLER under this CQI (i, j):
According to the ACK/NACK that reports, confirm CQI and MCS that ACK/NACK is corresponding, its value is designated as i1 and j1 respectively.Write down the frequency n that this CQI occurs I1With the frequency n ack that reports NACK I1, calculate under this CQI and to be the segmentation BLER of L near the window of current subframe is long, wherein, the value of L can be 40TTI.
If that report is ACK, then upgrade the BLER of j=0～j1 under this CQI (i1, j),, then upgrade the BLER of j=j1 under this CQI～28 if report NACK (i1, j)
BLER (i1, j)The renewal of value is undertaken by following process:
For upgrading BLER (i1, j)The MCS of parameter, wherein Times (i1, j)Smaller or equal to the MCS of N, the value of N can be 200, and by formula 1 upgrades BLER (i1, j):
BLER ( i 1 , j ) = BLER ( i 1 , j ) * Times ( i 1 , j ) + NACK Times ( i 1 , j ) + 1 Formula 1
When report be ACK the time, NACK=0, when reporting NACK, NACK=1.Then to having upgraded BLER (i1, j)The Times of all MCS (i1, j)Add 1.
For upgrading BLER (i1, j)The MCS of parameter, wherein Times (i1, j)Greater than the MCS of N, by formula 2 upgrade BLER (i1, j), no longer upgrade simultaneously and preserve Times (i1, j):
BLER ( i 1 , j ) = 1 + ( N - 1 ) BLER ( i 1 , j ) N , NACK = 1 ( N - 1 ) BLER ( i 1 , j ) N , NACK = 0 Formula 2
If the CQI_state of the CQI that this ACK/NACK is corresponding I1=, execution in step 2, otherwise jump to step 303.
Step 2 is upgraded Δ MCS I1, upgrade the flag bit whether this CQI gets into stable state when satisfying specified conditions.
Particularly, if n I1Smaller or equal to a certain threshold value n 0(desirable 40) and nack I1Smaller or equal to another threshold value nack 0, preferably, n 0Value can be 40, nack 0Value can be 4, Δ MCS then I1Constant; If n I1Greater than a certain threshold value n 0And nack I1Smaller or equal to another threshold value nack 0, Δ MCS then I1Constant, CQI_state I1=1; Otherwise Δ MCS I1Subtract 1, n I1=0, nack I1=0.
Step 303, MCS confirms:
According to the CQI that reports, its value is designated as i2, if CQI is corresponding CQI_state I2=0, confirm modulation coding mode MCS as follows:
1,, the value i2 of channel quality indicator (CQI) is mapped as modulation coding mode initial value MCSinit according to CQI-MCSinit mapping relations table;
2, with the corresponding correction value Δ MCS of this CQI I2MCSinit revises to the modulation coding mode initial value, obtains modulation coding mode MCSfinal.Makeover process carries out as follows: with Δ MCS I2With modulation coding mode initial value MCSinit addition.
If the CQI_state that CQI is corresponding I2=1, select the corresponding BLER of this CQI (i2, j)Less than the j of the maximum that equals a certain threshold value, preferably, this threshold value is desirable 8%, judges the segmentation BLER under this CQI then, if segmentation BLER is less than a certain threshold value B LER in (j=0～28) Low, then j adds 1, otherwise j is constant, wherein, BLER LowCan get 2.5%; The modulation coding mode MCSfinal that j promptly obtains.
The embodiment of the invention is added up different correction value Δ MCS through the CQI to terminal to report iSolved that the terminal reports different CQI accuracy different problems in the prior art, in addition, the embodiment of the invention is divided into initial condition and stable state with the state of CQI; Two states adopts different AMC flow processs down, thereby can select the suitable modulating coded system more accurately; The embodiment of the invention is through the BLER of each MCS under the statistics CQI, selects the maximum MCS that satisfies condition according to the BLER threshold value of setting, thereby can take into account the BLER performance and the maximum throughput performance of system; The embodiment of the invention according to the ACK/NACK that reports, is upgraded the BLER of the one group of MCS that satisfies condition, thereby can be shortened the time of initialization procedure when upgrading the BLER state of CQI.
Device embodiment
According to embodiments of the invention; A kind of Adaptive Modulation and Coding device is provided; Fig. 4 is the structural representation of the Adaptive Modulation and Coding device of the embodiment of the invention; As shown in Figure 4, comprise according to the Adaptive Modulation and Coding device of the embodiment of the invention: CQI initialization module 40, CQI state update module 41, MCS correcting module 42 and MCS select correcting module 43, below each module of the embodiment of the invention are carried out detailed explanation.
CQI initialization module 40 is used under the situation that the CQI of terminal to report occurs first; The CQI of record terminal to report; Parameter to the CQI of terminal to report is carried out initialization; Wherein, parameter comprises: the Block Error Rate of state flag bit, modulation coding mode correction value, the modulation coding mode MCS that can select and the access times of each MCS;
CQI initialization module 40 specifically comprises: state flag bit initialization module, modulation coding mode correction value initialization module, Block Error Rate initialization module and MCS access times initialization module; Wherein, to be used for the state flag bit of the parameter of the CQI that initialization terminal reports be labile state to the state flag bit initialization module; Modulation coding mode correction value initialization module is used for the parameter modulation coding mode correction value corresponding with the CQI of terminal to report of the CQI that initialization terminal reports; The Block Error Rate initialization module is used for the Block Error Rate of the MCS that the parameter of the CQI that initialization terminal reports can select; The access times that MCS access times initialization module is used for each MCS of parameter of initialization CQI are 1.
Particularly, modulation coding mode correction value initialization module specifically is used for:
If the CQI of terminal to report is first CQI that reports, then the modulation coding mode correction value corresponding with the CQI of terminal to report is zero in the parameter of the CQI that reports of initialization terminal;
If the CQI of terminal to report is is not first CQI that reports; The modulation coding mode correction value corresponding in the parameter of the CQI that then reports according to the pre-defined rule initialization terminal with the CQI of terminal to report; Wherein, Pre-defined rule comprises: confirm whether the existence flag bit is the CQI of stable state in the record, if exist, then the computing mode flag bit is the mean value of the pairing modulation coding mode correction value of CQI of stable state; And after rounding downwards, the modulation coding mode correction value corresponding with the CQI of terminal to report is the value that obtains after this mean value rounds downwards in the parameter of the CQI that initialization terminal reports; If the existence flag bit is not the CQI of stable state; Then calculate the mean value of the pairing modulation coding mode correction value of all CQI except that the CQI of this record in the record; And after rounding downwards, the modulation coding mode correction value corresponding with the CQI of terminal to report is the value that obtains after this mean value rounds downwards in the parameter of the CQI that initialization terminal reports.
The Block Error Rate initialization module specifically comprises: mapping submodule, revise submodule and initialization submodule, wherein, mapping submodule is used for the mapping relations table according to CQI and MCS initial value, and the CQI of terminal to report is mapped as the MCS initial value; Revising submodule is used for according to the pairing modulation coding mode correction value of the CQI of terminal to report the MCS initial value being revised in a predefined manner; Obtain revised MCS; Wherein, The span of revised MCS is 0 to 28, and above-mentioned reservation mode is: with pairing modulation coding mode correction value of the CQI of terminal to report and the addition of MCS initial value; The initialization submodule is used for the value j of MCS under the CQI of the terminal to report Block Error Rate from 0 to final MCS is initialized as 0; J under the CQI of terminal to report is initialized as 1 from the Block Error Rate of final MCS+1 to 28; Wherein, the span of j is 0 to 28, the value of 29 kinds of MCS of expression.
CQI state update module 41 is used for the positive acknowledgment ACK/ NACK NACK based on terminal to report; Upgrade the Block Error Rate of the CQI corresponding with ACK/NACK; And be under the situation of labile state at the state flag bit of the CQI corresponding with ACK/NACK, further upgrade modulation coding mode correction value and the state flag bit of the CQI corresponding with ACK/NACK;
Particularly, CQI state update module 41 specifically is used for:
According to the ACK/NACK of terminal to report, confirm CQI and the MCS corresponding, the frequency n that the CQI that record is corresponding with the ACK/NACK of terminal to report occurs with the ACK/NACK of terminal to report I1And the frequency n ack that reports NACK I1And under the calculating CQI corresponding with the ACK/NACK of terminal to report near the long segmentation Block Error Rate of the window of current subframe, wherein, CQI corresponding with the ACK/NACK of terminal to report and the value of MCS are respectively i1 and j1; The span of i is 0 to 15; The value of CQI in the expression 16, the span of j is 0 to 28, the value of 29 kinds of MCS of expression;
If that terminal to report is ACK, then upgrade the block error rate BLER of j=0～j1 under the CQI corresponding with the ACK of terminal to report (i1, j)If, terminal to report be NACK, then upgrade the block error rate BLER of j=j1～28 under the CQI corresponding with the NACK of terminal to report (i1, j)
Confirm to upgrade BLER (i1, j)Pairing MCS, and the access times Times of definite this MCS (i1, J)Whether smaller or equal to the threshold value N that is provided with in advance, if then upgrade BLER according to formula 1 (i1, j), and to having upgraded BLER (i1, j)The Times of all MCS (i1, j)Add 1; Otherwise, upgrade BLER according to formula 2 (i1, j)
BLER ( i 1 , j ) = BLER ( i 1 , j ) * Times ( i 1 , j ) + NACK Times ( i 1 , j ) + 1 Formula 1
BLER ( i 1 , j ) = 1 + ( N - 1 ) BLER ( i 1 , j ) N , NACK = 1 ( N - 1 ) BLER ( i 1 , j ) N , NACK = 0 Formula 2
Wherein, in formula 1, when terminal to report be ACK the time, NACK=0, when terminal to report be NACK the time, NACK=1;
State flag bit at the CQI corresponding with ACK/NACK is under the situation of labile state, in the frequency n of the CQI appearance corresponding with the ACK/NACK of terminal to report I1Smaller or equal to the threshold value n that is provided with in advance 0And report the frequency n ack of NACK I1Smaller or equal to the threshold value nack that is provided with in advance 0Situation under, the modulation coding mode correction value Δ MCS of the CQI corresponding with ACK/NACK I1Constant;
Frequency n in the CQI appearance corresponding with the ACK/NACK of terminal to report I1Greater than the threshold value n that is provided with in advance 0And report the frequency n ack of NACK I1Smaller or equal to the threshold value nack that is provided with in advance 0Situation under, Δ MCS I1Constant, the state flag bit CQI_state of the CQI corresponding with ACK/NACK I1=1;
Except that above-mentioned two kinds of situation, Δ MCS I1Subtract 1, n I1=0, nack I1=0.
The state flag bit that MCS correcting module 42 is used at the CQI of terminal to report is under the unsettled situation, obtains final MCS according to the modulation coding mode correction value of the CQI of the CQI of terminal to report and terminal to report;
Particularly, above-mentioned MCS correcting module 42 specifically is used for:
1,, the value i2 of the CQI of terminal to report is mapped as the MCS initial value according to the mapping relations table of CQI and MCS initial value; 2, according to the pairing modulation coding mode correction value of the CQI of terminal to report Δ MCS I2The MCS initial value is revised in a predefined manner, obtained final MCS, wherein, above-mentioned reservation mode is: with pairing modulation coding mode correction value of the CQI of terminal to report and the addition of MCS initial value.
It is under the stable situation, to confirm final MCS according to the CQI of terminal to report and the pairing Block Error Rate of CQI of terminal to report that MCS selects correcting module 43 to be used for state flag bit at the CQI of terminal to report.
Particularly, MCS selects correcting module 43 specifically to be used for:
1, selects the pairing block error rate BLER of CQI of terminal to report (i2, j)In, smaller or equal to the j of the maximum of predetermined threshold value; 2,, judge that whether the segmentation Block Error Rate is less than the thresholding BLER that is provided with in advance according to the segmentation Block Error Rate under the CQI of terminal to report LowIf, be judged as and be, then j adds 1, otherwise j is constant; 3, confirm final MCS according to the value of j.
In sum, the embodiment of the invention is added up different correction value Δ MCS through the CQI to terminal to report iSolved that the terminal reports different CQI accuracy different problems in the prior art, in addition, the embodiment of the invention is divided into initial condition and stable state with the state of CQI; Two states adopts different AMC flow processs down, thereby can select the suitable modulating coded system more accurately; The embodiment of the invention is through the BLER of each MCS under the statistics CQI, selects the maximum MCS that satisfies condition according to the BLER threshold value of setting, thereby can take into account the BLER performance and the maximum throughput performance of system; The embodiment of the invention according to the ACK/NACK that reports, is upgraded the BLER of the one group of MCS that satisfies condition, thereby can be shortened the time of initialization procedure when upgrading the BLER state of CQI.
Although be the example purpose, the preferred embodiments of the present invention are disclosed, it also is possible those skilled in the art will recognize various improvement, increase and replacement, therefore, scope of the present invention should be not limited to the foregoing description.

Claims (18)

1. an adaptive modulation coding method is characterized in that, comprising:
Step 1 under the situation that the channel quality indicator (CQI) of confirming terminal to report occurs first, writes down the CQI of said terminal to report; Parameter to the CQI of said terminal to report is carried out initialization; And execution in step 2, under the non-situation about occurring first of the CQI that confirms said terminal to report, direct execution in step 2; Wherein, said parameter comprises: the Block Error Rate of state flag bit, modulation coding mode correction value, the modulation coding mode MCS that can select and the access times of each MCS;
Step 2; Positive acknowledgement ACK/ NACK NACK according to said terminal to report; Upgrade the Block Error Rate of the CQI corresponding with said ACK/NACK; And be under the situation of labile state at the state flag bit of the CQI corresponding with said ACK/NACK, further upgrade modulation coding mode correction value and the state flag bit of the CQI corresponding, execution in step 3 with said ACK/NACK;
Step 3; State flag bit at the CQI of said terminal to report is under the unsettled situation; Modulation coding mode correction value according to the CQI of the CQI of said terminal to report and said terminal to report is obtained final MCS; Under the state flag bit of the CQI of said terminal to report is stable situation, confirm final MCS according to the CQI of said terminal to report and the pairing Block Error Rate of CQI of said terminal to report.
2. the method for claim 1 is characterized in that, under the situation that the CQI of said terminal to report occurs first, the parameter of the CQI of said terminal to report is carried out initialization specifically comprise:
State flag bit in the parameter of the CQI of the said terminal to report of initialization is said labile state;
The modulation coding mode correction value corresponding in the parameter of the CQI of the said terminal to report of initialization with the CQI of said terminal to report;
The Block Error Rate of the MCS that can select described in the parameter of the CQI of the said terminal to report of initialization;
The access times of each MCS described in the parameter of the said CQI of initialization are 1.
3. method as claimed in claim 2 is characterized in that, modulation coding mode correction value corresponding with the CQI of said terminal to report in the parameter of the CQI of the said terminal to report of initialization specifically comprises:
If the CQI of said terminal to report is first CQI that reports, then the modulation coding mode correction value corresponding with the CQI of said terminal to report is zero in the parameter of the CQI of the said terminal to report of initialization;
If the CQI of said terminal to report is is not first CQI that reports; Then according to the modulation coding mode correction value corresponding in the parameter of the CQI of the said terminal to report of pre-defined rule initialization with the CQI of said terminal to report; Wherein, Said pre-defined rule comprises: confirm whether the existence flag bit is the CQI of stable state in the record, if exist, then calculating said state flag bit is the mean value of the pairing modulation coding mode correction value of CQI of stable state; And after rounding downwards, the modulation coding mode correction value corresponding with the CQI of said terminal to report is the value that obtains after this mean value rounds downwards in the parameter of the CQI of the said terminal to report of initialization; If not having said state flag bit is the CQI of stable state; Then calculate the mean value of the pairing modulation coding mode correction value of all CQI except that the CQI of this record in the record; And after rounding downwards, the modulation coding mode correction value corresponding with the CQI of said terminal to report is the value that obtains after this mean value rounds downwards in the parameter of the CQI of the said terminal to report of initialization.
4. method as claimed in claim 2 is characterized in that, the Block Error Rate of the MCS that can select described in the parameter of the CQI of the said terminal to report of initialization comprises:
According to the mapping relations table of CQI and MCS initial value, the CQI of said terminal to report is mapped as the MCS initial value;
According to the pairing modulation coding mode correction value of the CQI of said terminal to report said MCS initial value is revised in a predefined manner, obtained revised MCS, wherein, the span of said revised MCS is 0 to 28;
The value j of MCS under the CQI of the said terminal to report Block Error Rate from 0 to final MCS is initialized as 0, j under the CQI of said terminal to report is initialized as 1 from the Block Error Rate of final MCS+1 to 28, wherein, the span of j is 0 to 28, the value of 29 kinds of MCS of expression.
5. the method for claim 1 is characterized in that, according to the ACK/NACK of said terminal to report, the Block Error Rate that upgrades the CQI corresponding with said ACK/NACK comprises:
According to the ACK/NACK of said terminal to report, confirm CQI and the MCS corresponding, the frequency n that the CQI that record is corresponding with the ACK/NACK of said terminal to report occurs with the ACK/NACK of said terminal to report I1And the frequency n ack that reports said NACK I1And under the calculating CQI corresponding with the ACK/NACK of said terminal to report near the long segmentation Block Error Rate of the window of current subframe, wherein, CQI corresponding with the ACK/NACK of said terminal to report and the value of MCS are respectively i1 and j1; The span of i is 0 to 15; The value of CQI in the expression 16, the span of j is 0 to 28, the value of 29 kinds of MCS of expression;
If that said terminal to report is ACK, then upgrade the block error rate BLER of j=0～j1 under the CQI corresponding with the ACK of said terminal to report (i1, j)If, said terminal to report be NACK, then upgrade the block error rate BLER of j=j1～28 under the CQI corresponding with the NACK of said terminal to report (i1, j)
6. method as claimed in claim 5 is characterized in that, upgrades the block error rate BLER of the CQI corresponding with said ACK/NACK (i1, j)Specifically comprise:
Confirm to upgrade BLER (i1, j)Pairing MCS, and the access times Times of definite this MCS (i1, J)Whether smaller or equal to the threshold value N that is provided with in advance, if then upgrade said BLER according to formula 1 (i1, J), and to having upgraded BLER (i1, j)The Times of all MCS (i1, j)Add 1; Otherwise, upgrade said BLER according to formula 2 (i1, j)
BLER ( i 1 , j ) = BLER ( i 1 , j ) * Times ( i 1 , j ) + NACK Times ( i 1 , j ) + 1 Formula 1
BLER ( i 1 , j ) = 1 + ( N - 1 ) BLER ( i 1 , j ) N , NACK = 1 ( N - 1 ) BLER ( i 1 , j ) N , NACK = 0 Formula 2
Wherein, in said formula 1, when said terminal to report be ACK the time, NACK=0, when said terminal to report be NACK the time, NACK=1.
7. the method for claim 1; It is characterized in that; State flag bit at the CQI corresponding with said ACK/NACK is under the situation of labile state, and the modulation coding mode correction value and the state flag bit that further upgrade the CQI corresponding with said ACK/NACK specifically comprise:
Frequency n in the CQI appearance corresponding with the ACK/NACK of said terminal to report I1Smaller or equal to the threshold value n that is provided with in advance 0And report the frequency n ack of said NACK I1Smaller or equal to the threshold value nack that is provided with in advance 0Situation under, the modulation coding mode correction value Δ MCS of the CQI corresponding with said ACK/NACK I1Constant;
Frequency n in the CQI appearance corresponding with the ACK/NACK of said terminal to report I1Greater than the threshold value n that is provided with in advance 0And report the frequency n ack of said NACK I1Smaller or equal to the threshold value nack that is provided with in advance 0Situation under, said Δ MCS I1Constant, the state flag bit CQI_state of the CQI corresponding with said ACK/NACK I1=1;
Except that above-mentioned two kinds of situation, said Δ MCS I1Subtract 1, n I1=0, nack I1=0.
8. the method for claim 1; It is characterized in that; State flag bit at the CQI of said terminal to report is under the unsettled situation, obtains final MCS according to the modulation coding mode correction value of the CQI of the CQI of said terminal to report and said terminal to report and specifically comprises:
According to the mapping relations table of CQI and MCS initial value, the value i2 of the CQI of said terminal to report is mapped as the MCS initial value;
According to the pairing modulation coding mode correction value of the CQI of said terminal to report Δ MCS I2Said MCS initial value is revised in a predefined manner, obtained said final MCS.
9. method as claimed in claim 5; It is characterized in that; Under the state flag bit of the CQI of said terminal to report is stable situation, confirm that according to the CQI of said terminal to report and the pairing Block Error Rate of CQI of said terminal to report final MCS specifically comprises:
Select the pairing block error rate BLER of CQI of said terminal to report (i2, j)In, smaller or equal to the j of the maximum of predetermined threshold value;
According to the said segmentation Block Error Rate under the CQI of said terminal to report, judge that whether said segmentation Block Error Rate is less than the thresholding BLER that is provided with in advance LowIf, be judged as and be, then j adds 1, otherwise j is constant;
Confirm final MCS based on the value of j.
10. like claim 4 and 8 described methods, it is characterized in that said predetermined way comprises:
With pairing modulation coding mode correction value of the CQI of said terminal to report and the addition of said MCS initial value.
11. an Adaptive Modulation and Coding device is characterized in that, comprising:
The CQI initialization module; Be used under the situation that the CQI that confirms terminal to report occurs first; Write down the CQI of said terminal to report; Parameter to the CQI of said terminal to report is carried out initialization, and wherein, said parameter comprises: the Block Error Rate of state flag bit, modulation coding mode correction value, the modulation coding mode MCS that can select and the access times of each MCS;
CQI state update module; Be used for positive acknowledgement ACK/ NACK NACK according to said terminal to report; Upgrade the Block Error Rate of the CQI corresponding with said ACK/NACK; And be under the situation of labile state at the state flag bit of the CQI corresponding with said ACK/NACK, further upgrade modulation coding mode correction value and the state flag bit of the CQI corresponding with said ACK/NACK;
The MCS correcting module, the state flag bit that is used at the CQI of said terminal to report is under the unsettled situation, obtains final MCS according to the modulation coding mode correction value of the CQI of the CQI of said terminal to report and said terminal to report;
MCS selects correcting module, is used for state flag bit at the CQI of said terminal to report and is confirming final MCS according to the CQI of said terminal to report and the pairing Block Error Rate of CQI of said terminal to report under the stable situation.
12. device as claimed in claim 11 is characterized in that, said CQI initialization module specifically comprises:
The state flag bit initialization module, the state flag bit of parameter that is used for the CQI of the said terminal to report of initialization is said labile state;
Modulation coding mode correction value initialization module is used for the parameter modulation coding mode correction value corresponding with the CQI of said terminal to report of the CQI of the said terminal to report of initialization;
The Block Error Rate initialization module, the Block Error Rate of the MCS that is used for can selecting described in the parameter of CQI of the said terminal to report of initialization;
MCS access times initialization module, the access times that are used for each MCS described in the parameter of the said CQI of initialization are 1.
13. device as claimed in claim 12 is characterized in that, said modulation coding mode correction value initialization module specifically is used for:
If the CQI of said terminal to report is first CQI that reports, then the modulation coding mode correction value corresponding with the CQI of said terminal to report is zero in the parameter of the CQI of the said terminal to report of initialization;
If the CQI of said terminal to report is is not first CQI that reports; Then according to the modulation coding mode correction value corresponding in the parameter of the CQI of the said terminal to report of pre-defined rule initialization with the CQI of said terminal to report; Wherein, Said pre-defined rule comprises: confirm whether the existence flag bit is the CQI of stable state in the record, if exist, then calculating said state flag bit is the mean value of the pairing modulation coding mode correction value of CQI of stable state; And after rounding downwards, the modulation coding mode correction value corresponding with the CQI of said terminal to report is the value that obtains after this mean value rounds downwards in the parameter of the CQI of the said terminal to report of initialization; If not having said state flag bit is the CQI of stable state; Then calculate the mean value of the pairing modulation coding mode correction value of all CQI except that the CQI of this record in the record; And after rounding downwards, the modulation coding mode correction value corresponding with the CQI of said terminal to report is the value that obtains after this mean value rounds downwards in the parameter of the CQI of the said terminal to report of initialization.
14. device as claimed in claim 12 is characterized in that, said Block Error Rate initialization module specifically comprises:
Mapping submodule is used for the mapping relations table according to CQI and MCS initial value, and the CQI of said terminal to report is mapped as the MCS initial value;
Revise submodule, be used for according to the pairing modulation coding mode correction value of the CQI of said terminal to report said MCS initial value being revised in a predefined manner, obtain revised MCS, wherein, the span of said revised MCS is 0 to 28;
The initialization submodule; Be used for the value j of MCS under the CQI of the said terminal to report Block Error Rate from 0 to final MCS is initialized as 0, j under the CQI of said terminal to report be initialized as 1 from the Block Error Rate of final MCS+1 to 28, wherein; The span of j is 0 to 28, the value of 29 kinds of MCS of expression.
15. device as claimed in claim 11 is characterized in that, said CQI state update module specifically is used for:
According to the ACK/NACK of said terminal to report, confirm CQI and the MCS corresponding, the frequency n that the CQI that record is corresponding with the ACK/NACK of said terminal to report occurs with the ACK/NACK of said terminal to report I1And the frequency n ack that reports said NACK I1And under the calculating CQI corresponding with the ACK/NACK of said terminal to report near the long segmentation Block Error Rate of the window of current subframe, wherein, CQI corresponding with the ACK/NACK of said terminal to report and the value of MCS are respectively i1 and j1; The span of i is 0 to 15; The value of CQI in the expression 16, the span of j is 0 to 28, the value of 29 kinds of MCS of expression;
If that said terminal to report is ACK, then upgrade the block error rate BLER of j=0～j1 under the CQI corresponding with the ACK of said terminal to report (i1, j)If, said terminal to report be NACK, then upgrade the block error rate BLER of j=j1～28 under the CQI corresponding with the NACK of said terminal to report (i1, j)
Confirm to upgrade BLER (i1, j)Pairing MCS, and the access times Times of definite this MCS (i1, J)Whether smaller or equal to the threshold value N that is provided with in advance, if then upgrade said BLER according to formula 1 (i1, J), and to having upgraded BLER (i1, j)The Times of all MCS (i1, j)Add 1; Otherwise, upgrade said BLER according to formula 2 (i1, j)
BLER ( i 1 , j ) = BLER ( i 1 , j ) * Times ( i 1 , j ) + NACK Times ( i 1 , j ) + 1 Formula 1
BLER ( i 1 , j ) = 1 + ( N - 1 ) BLER ( i 1 , j ) N , NACK = 1 ( N - 1 ) BLER ( i 1 , j ) N , NACK = 0 Formula 2
Wherein, in said formula 1, when said terminal to report be ACK the time, NACK=0, when said terminal to report be NACK the time, NACK=1;
State flag bit at the CQI corresponding with said ACK/NACK is under the situation of labile state, in the frequency n of the CQI appearance corresponding with the ACK/NACK of said terminal to report I1Smaller or equal to the threshold value n that is provided with in advance 0And report the frequency n ack of said NACK I1Smaller or equal to the threshold value nack that is provided with in advance 0Situation under, the modulation coding mode correction value Δ MCS of the CQI corresponding with said ACK/NACK I1Constant;
Frequency n in the CQI appearance corresponding with the ACK/NACK of said terminal to report I1Greater than the threshold value n that is provided with in advance 0And report the frequency n ack of said NACK I1Smaller or equal to the threshold value nack that is provided with in advance 0Situation under, said Δ MCS I1Constant, the state flag bit CQI_state of the CQI corresponding with said ACK/NACK I1=1;
Except that above-mentioned two kinds of situation, said Δ MCS I1Subtract 1, n I1=0, nack I1=0.
16. device as claimed in claim 11 is characterized in that, said MCS correcting module specifically is used for:
According to the mapping relations table of CQI and MCS initial value, the value i2 of the CQI of said terminal to report is mapped as the MCS initial value;
According to the pairing modulation coding mode correction value of the CQI of said terminal to report Δ MCS I2Said MCS initial value is revised in a predefined manner, obtained said final MCS.
17. device as claimed in claim 11 is characterized in that, said MCS selects correcting module specifically to be used for:
Select the pairing block error rate BLER of CQI of said terminal to report (i2, j)In, smaller or equal to the j of the maximum of predetermined threshold value;
According to the said segmentation Block Error Rate under the CQI of said terminal to report, judge that whether said segmentation Block Error Rate is less than the thresholding BLER that is provided with in advance LowIf, be judged as and be, then j adds 1, otherwise j is constant;
Confirm final MCS based on the value of j.
18., it is characterized in that said predetermined way comprises like claim 14 or 16 described devices:
With pairing modulation coding mode correction value of the CQI of said terminal to report and the addition of said MCS initial value.
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