CN102377508B - 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

Info

Publication number
CN102377508B
CN102377508B CN201010252688.4A CN201010252688A CN102377508B CN 102377508 B CN102377508 B CN 102377508B CN 201010252688 A CN201010252688 A CN 201010252688A CN 102377508 B CN102377508 B CN 102377508B
Authority
CN
China
Prior art keywords
cqi
report
mcs
nack
terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201010252688.4A
Other languages
Chinese (zh)
Other versions
CN102377508A (en
Inventor
王希维
姚春峰
张娟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xu Qiang
Original Assignee
ZTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to CN201010252688.4A priority Critical patent/CN102377508B/en
Priority to PCT/CN2010/079400 priority patent/WO2012019403A1/en
Publication of CN102377508A publication Critical patent/CN102377508A/en
Application granted granted Critical
Publication of CN102377508B publication Critical patent/CN102377508B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • 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 the related, long evolving system (Long Term Evolution, referred to as LTE) is third generation partner program (3 rdgeneration Partnershiop Project, referred to as 3GPP) under the trend of mobile communication broad band, in order to resist worldwide interoperability for microwave access (World interoperability forMicrowave Access, referred to as WiMAX) etc. the market challenges of Broadband Wireless Access Technologies, at super 3 g mobile communication system (Beyond Third Generation in mobile communicationsystem, referred to as B3G) accurate forth generation mobile communication technology (FourthGeneration that the basis of technology is developed, referred to as 4G).
LTE aloft interface aspect uses frequency division multiple access (Orthogonal Frequency DivisionMultiplexing, referred to as OFDM) technology, instead of code division multiple access (the Code-Division Mutiple Access of 3GPP Long-Time Service, referred to as CDMA) technology, and have employed multiple-input and multiple-output (Multiple Input Multiple Output in a large number, referred to as MIMO) technology and adaptive technique improve data transfer rate and systematic function, therefore Future cellular mobile communication system is become, the core technology of the systems such as wireless broadband access system.
Adaptive Modulation and Coding (Adaptive Modulation and Coding, referred to as AMC) is the technology that a kind of change according to Real-time Channel situation changes modulation system and code check.In the system using AMC technology, for the terminal of bad channel conditions, low-order-modulated mode and low bit-rate can be used, and for the good terminal of channel condition, then can use high-order modulating and high code check.AMC technology especially can improve the message transmission rate of the terminal of bad channel conditions, thus can improve the average throughput of system.In addition, AMC is by changing modulation coding mode instead of improve systematic function by the change of through-put power, decreasing the interference of system.
In the related, propose the down self-adapting modulation coding method in a kind of ofdm system and base station, the method to interference-to-noise ratio adjusted value, adjusts corresponding modulation coding mode by adjustment carrier wave.But, the method is not considered at different carrier waves interval to interference-to-noise ratio, the situation that adjustment amount possibility is different, thus cause at all possible carrier wave within the scope of interference-to-noise ratio, the carrier wave after adjustment may a corresponding irrational modulation coding mode to interference-to-noise ratio.
In addition, a kind of adaptive code modulation method is also comprised in prior art, in the method, according to cyclic redundancy check (CRC) code (Cyclic Redundancy Check, referred to as CRC) check results, the thresholding of real-time renewal modulation coding mode (Modulation and Coding Scheme, referred to as MCS).But technique scheme does not consider the system starting stage, the initial value of MCS thresholding may situation incongruent with systematic function, different Signal to Interference plus Noise Ratio (Signal to Interference plusNoise Ratio is not considered yet, referred to as SINR) interval, the situation that the adjustment amount of MCS thresholding is different.
As can be seen from above-mentioned two technical schemes, the adaptive code modulation method of the prior art MCS that ability rating is different, channel type is different and/or adaptive modulation coding method is unreasonable caused existed due to terminal selects the problem of unreasonable, terminal throughput poor performance and Block Error Rate (Block Error Ratio, referred to as BLER) index error.
Summary of the invention
The invention provides a kind of adaptive modulation coding method and device, the MCS that the ability rating due to terminal is different, channel type is different and/or adaptive modulation coding method is unreasonable caused existed to solve prior art selects the problem of unreasonable, terminal throughput poor performance and BLER index error.
The invention provides a kind of adaptive modulation coding method, comprising:
Step 1, when determining that the channel quality indicator (CQI) of terminal to report occurs first, the CQI of record terminal to report, initialization is carried out to the parameter of the CQI of terminal to report, and perform step 2, when determining that the CQI of terminal to report is non-and occurring first, directly perform step 2, wherein, above-mentioned parameter comprises: state flag bit, modulation coding mode correction value, the Block Error Rate of modulation coding mode MCS that can select and the access times of each MCS;
Step 2, according to the positive acknowledgement ACK/ Negative Acknowledgement NACK of terminal to report, upgrade the Block Error Rate of the CQI corresponding with ACK/NACK, and when the state flag bit of the CQI corresponding with ACK/NACK is labile state, the modulation coding mode correction value of the CQI that further renewal is corresponding with ACK/NACK and state flag bit, perform step 3;
Step 3, when the state flag bit of the CQI of terminal to report is unstable, modulation coding mode correction value according to the CQI of terminal to report and the CQI of terminal to report obtains final MCS, when the state flag bit of the CQI of terminal to report is stable, the Block Error Rate corresponding to the CQI of terminal to report and the CQI of terminal to report determines final MCS.
Present invention also offers a kind of Adaptive Modulation and Coding device, comprising:
CQI initialization module, for when determining that the CQI of terminal to report occurs first, the CQI of record terminal to report, initialization is carried out to the parameter of the CQI of terminal to report, wherein, parameter comprises: state flag bit, modulation coding mode correction value, the Block Error Rate of modulation coding mode MCS that can select and the access times of each MCS;
CQI state updating module, for the positive acknowledgement ACK/ Negative Acknowledgement NACK according to terminal to report, upgrade the Block Error Rate of the CQI corresponding with ACK/NACK, and when the state flag bit of the CQI corresponding with ACK/NACK is labile state, upgrade modulation coding mode correction value and the state flag bit of the CQI corresponding with ACK/NACK further;
MCS correcting module, the state flag bit for the CQI at terminal to report is unstable, the modulation coding mode correction value according to the CQI of terminal to report and the CQI of terminal to report obtains final MCS;
MCS selects correcting module, and the state flag bit for the CQI at terminal to report is stable, the Block Error Rate corresponding to the CQI of terminal to report and the CQI of terminal to report determines final MCS.
Beneficial effect of the present invention is as follows:
The embodiment of the present invention, by the CQI for terminal to report, adds up different correction value Δ MCS isolve terminal in prior art and report the problem that different CQI accuracy is different, in addition, the state of CQI is divided into initial condition and stable state by the embodiment of the present invention, adopt different AMC flow processs under two states, thus suitable modulation coding mode can be selected more accurately; The embodiment of the present invention, by the BLER of each MCS under statistics CQI, is selected the maximum MCS satisfied condition, thus can be taken into account BLER performance and the maximum throughput performance of system according to the BLER threshold value of setting; The embodiment of the present invention, when upgrading the BLER state of CQI, according to the ACK/NACK reported, upgrades the BLER of the one group of MCS satisfied condition, thus can shorten the time of initialization procedure.
Accompanying drawing explanation
Fig. 1 is the flow chart of the adaptive modulation coding method of the embodiment of the present invention;
Fig. 2 is the principle flow chart of the adaptive modulation coding method of the embodiment of the present invention;
Fig. 3 is the flow chart of the detailed process of the adaptive modulation coding method of the embodiment of the present invention;
Fig. 4 is the structural representation of the Adaptive Modulation and Coding device of the embodiment of the present invention.
Embodiment
The MCS that the ability rating due to terminal is different, channel type is different and/or adaptive modulation coding method is unreasonable caused existed to solve prior art selects the problem of unreasonable, terminal throughput poor performance and 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, do not limit the present invention.
Embodiment of the method
According to embodiments of the invention, provide a kind of adaptive modulation coding method, Fig. 1 is the flow chart of the adaptive modulation coding method of the embodiment of the present invention, as shown in Figure 1, comprises following process according to the adaptive modulation coding method of the embodiment of the present invention:
Step 101, (Channel Quality Indicator is indicated at the channel quality of terminal to report, referred to as CQI) when occurring first, the CQI of record terminal to report, initialization is carried out to the parameter of the CQI of terminal to report, after executing initialization, perform step 102, when determining that the CQI of terminal to report is non-and occurring first, direct execution step 102, wherein, above-mentioned parameter comprises: whether this CQI enters the state flag bit of stable state, the modulation coding mode correction value that this CQI is corresponding, the Block Error Rate of all MCS that can select under this CQI, and the access times of each MCS under this CQI,
Particularly, in a step 101, initialization is carried out to the parameter of the CQI of terminal to report and specifically comprises following process:
1, the state flag bit in the parameter of CQI that reports of initialization terminal is labile state (also can be called initial condition); Wherein, state flag bit comprises labile state and stable state two kinds of values;
2, modulation coding mode correction value corresponding with the CQI of terminal to report in the parameter of CQI that initialization terminal reports;
Particularly, if the CQI of terminal to report be first CQI reported (that is, in the record of the CQI of terminal to report, this CQI is first), then in the parameter of CQI that reports of initialization terminal, the modulation coding mode correction value corresponding with the CQI of terminal to report is zero, if the CQI of terminal to report be not first CQI reported (namely, in the record of the CQI of terminal to report, other CQI have been have recorded before this CQI, the CQI that have recorded is different from this CQI), modulation coding mode correction value corresponding with the CQI of terminal to report in the parameter of the CQI then reported according to pre-defined rule initialization terminal, above-mentioned pre-defined rule comprises: determine in record, whether existence flag bit is the CQI of stable state, if existed, the then mean value of the modulation coding mode correction value of computing mode flag bit corresponding to the CQI of stable state, and after rounding downwards, modulation coding mode correction value corresponding with the CQI of terminal to report in the parameter of the CQI that initialization terminal reports is the value obtained after this mean value rounds downwards, if there is no state flag bit is the CQI of stable state, then calculate the mean value of the modulation coding mode correction value corresponding to all CQI in record except the CQI of this record, and after rounding downwards, modulation coding mode correction value corresponding with the CQI of terminal to report in the parameter of the CQI that initialization terminal reports is the value obtained after this mean value rounds downwards.
The Block Error Rate of the MCS that can select in the parameter of CQI that 3, initialization terminal reports;
Particularly, first according to the mapping relations table of CQI and MCS initial value, the CQI of terminal to report is mapped as MCS initial value; Subsequently, modulation coding mode correction value corresponding to the CQI of terminal to report is revised in a predefined manner to MCS initial value, obtain revised MCS, wherein, the span of revised MCS is 0 to 28, wherein, above-mentioned predetermined way comprises: the modulation coding mode correction value corresponding to the CQI of terminal to report be added with MCS initial value; Finally, the Block Error Rate of the value j of MCS under the CQI of terminal to report from 0 to final MCS is initialized as 0, the Block Error Rate of j under the CQI of terminal to report from final MCS+1 to 28 is initialized as 1, and wherein, the span of j is 0 to 28, represents the value of 29 kinds of MCS.
In the parameter of 4, initialization CQI, the access times of each MCS are 1.
Occur first if the CQI of terminal to report is non-, then directly jump to step 102.
Step 102, according to the ACK/NACK of terminal to report, upgrade the Block Error Rate of the CQI corresponding with ACK/NACK, and when the state flag bit of the CQI corresponding with ACK/NACK is labile state, the modulation coding mode correction value of the CQI that further renewal is corresponding with ACK/NACK and state flag bit, perform step 103; That is, if the state flag bit CQI_state of CQI corresponding to this ACK/NACK i=0, then upgrade the Δ MCS of this CQI i; If otherwise the CQI_state of CQI corresponding to this ACK/NACK i=1, then jump to step 103.
Particularly, in a step 102, according to the ACK/NACK of terminal to report, first determine CQI and MCS corresponding with the ACK/NACK of terminal to report, record the frequency n that the CQI corresponding with the ACK/NACK of terminal to report occurs i1and report the frequency n ack of NACK i1and closest to the segmentation Block Error Rate that the window of present sub-frame is long under calculating the CQI corresponding with the ACK/NACK of terminal to report, wherein, the value of CQI and MCS corresponding with the ACK/NACK of terminal to report is respectively i1 and j1, the span of i is 0 to 15, represent the value of CQI in 16, the span of j is 0 to 28, represents the value of 29 kinds of MCS;
In a step 102, if that terminal to report is ACK, then the block error rate BLER of j=0 ~ j1 under the CQI that renewal is 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).
Upgrading the block error rate BLER of the CQI corresponding with ACK/NACK (i1, j)time, first determine to upgrade BLER (i1, j)corresponding MCS, and determine the access times Times of this MCS (i1, j)whether be less than or equal to the threshold value N pre-set, if so, then upgrade BLER according to formula 1 (i1, j), and to have updated 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 equation 1, when terminal to report be ACK time, NACK=0, when terminal to report be NACK time, NACK=1.
In addition, in a step 102, when the state flag bit of the CQI corresponding with ACK/NACK is labile state, the modulation coding mode correction value and the state flag bit that upgrade the CQI corresponding with ACK/NACK further is also needed, particularly:
In the frequency n that the CQI corresponding with the ACK/NACK of terminal to report occurs i1be less than or equal to the threshold value n pre-set 0and report the frequency n ack of NACK i1be less than or equal to the threshold value nack pre-set 0when, the modulation coding mode correction value Δ MCS of the CQI corresponding with ACK/NACK i1constant;
In the frequency n that the CQI corresponding with the ACK/NACK of terminal to report occurs i1be greater than the threshold value n pre-set 0and report the frequency n ack of NACK i1be less than or equal to the threshold value nack pre-set 0when, Δ MCS i1constant, the state flag bit CQI_state of the CQI corresponding with ACK/NACK i1=1;
Except above-mentioned two situations, Δ MCS i1subtract 1, n i1=0, nack i1=0.
Step 103, when the state flag bit of the CQI of terminal to report is unstable, modulation coding mode correction value according to the CQI of terminal to report and the CQI of terminal to report obtains final MCS, when the state flag bit of the CQI of terminal to report is stable, the Block Error Rate corresponding to the CQI of terminal to report and the CQI of terminal to report determines final MCS.
That is, if the CQI_state of the CQI reported i=0, according to the modulation coding mode correction value Δ MCS of the CQI reported and this CQI, obtain final modulation coding mode MCSfinal.If the CQI_state of the CQI reported i=1, according to the CQI reported, select the BLER that this CQI is corresponding (i, j)be less than or equal to the maximum j of a certain threshold value in (j=0 ~ 28), then according to the segmentation BLER under this CQI, j value revised.The final modulation coding mode MCSfinal that namely j obtains.
Particularly, when the state flag bit of the CQI of terminal to report is unstable, 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 MCS initial value; Subsequently, the modulation coding mode correction value Δ MCS corresponding to the CQI of terminal to report i2mCS initial value is revised in a predefined manner, obtains final MCS; Wherein, above-mentioned predetermined way comprises: the modulation coding mode correction value corresponding to the CQI of terminal to report be added with MCS initial value.
When the state flag bit of the CQI of terminal to report is stable, first select the block error rate BLER corresponding to CQI of terminal to report (i2, j)in, be less than or equal to the maximum j of predetermined threshold value; Subsequently, according to the segmentation Block Error Rate under the CQI of terminal to report, judge whether segmentation Block Error Rate is less than the thresholding BLER pre-set low, if the judgment is Yes, then j adds 1, otherwise j is constant; Finally, final MCS is determined according to the value of j.
Fig. 2 is the principle flow chart of the adaptive modulation coding method of the embodiment of the present invention, as shown in Figure 2, comprises following process:
Step 201, judges whether the CQI of terminal to report occurs for the first time, if the judgment is Yes, then performs step 202, otherwise, directly perform step 203;
Step 202, the state parameter that the CQI that initialization terminal reports is corresponding, performs step 203;
Step 203, upgrades BLER and the modulation coding mode correction value of CQI corresponding to the ACK/NACK of terminal to report, performs step 204;
Step 204, judges whether the CQI of terminal to report enters stable state, if the judgment is Yes, then performs step 205, otherwise, perform step 206;
Step 205, selects modulation coding mode;
Step 206, upgrades the modulation coding mode correction value of this CQI, selects modulation coding mode.
As can be seen from above-mentioned process, by the CQI for terminal to report, add up different correction value Δ MCS i, solve terminal in prior art and report the problem that different CQI accuracy is different;
By the state of CQI is divided into initial condition and stable state, under two states, adopt different AMC flow processs, suitable modulation coding mode can be selected more accurately;
By the BLER of each MCS under statistics CQI, select the maximum MCS satisfied condition according to the BLER threshold value of setting, thus BLER performance and the maximum throughput performance of system can be taken into account;
By when upgrading the BLER state of CQI, according to the ACK/NACK reported, upgrading the BLER of the one group of MCS satisfied condition, thus the time of initialization procedure can be shortened.
Below in conjunction with accompanying drawing, the technical scheme of the embodiment of the present invention is described in detail.
Fig. 3 is the flow chart of the detailed process of the adaptive modulation coding method of the embodiment of the present invention, and first, suppose that i represents the value of 16 kinds of CQI, its span is the value that 0 ~ 15, j represents 29 kinds of MCS, and its span is 0 ~ 28.As shown in Figure 3, following process is comprised:
Step 301, if the CQI first time of terminal to report occurs, then records this CQI, and four of this CQI of initialization kinds of parameters.Concrete process is as follows:
Step 1, whether this CQI of initialization enters the flag bit CQI_state of stable state i=0, this flag bit equals this CQI of 0 expression and is in initial condition (that is, above-mentioned labile state), equals this CQI of 1 expression and is in stable state;
Step 2, the modulation coding mode correction value Δ MCS that this CQI of initialization is corresponding i;
If the CQI reported is first CQI, then Δ MCS i=0, otherwise Δ MCS ivalue carry out according to the following rules: find the CQI_state that whether existence value is 1 iif exist, by Δ MCS corresponding for these CQI iaverage and round downwards again, using this value as Δ MCS i; The CQI_state that value is 1 if do not exist i, then according to the CQI that recorded, by Δ MCS corresponding for the CQI that occurred before iaverage and round downwards again, using this value as Δ MCS i.
Step 3, the block error rate BLER of all MCS that may select under this CQI of initialization (i, j);
1, according to CQI-MCSinit mapping relations table, the value of channel quality indicator (CQI) is mapped as modulation coding mode initial value MCSinit;
2, with the correction value Δ MCS that this CQI is corresponding irevise modulation coding mode initial value MCSinit, obtain modulation coding mode MCSfinal (that is, above-mentioned revised MCS), limited field is 0 ~ 28; Makeover process carries out as follows: by Δ MCS ibe added with modulation coding mode initial value MCSinit;
3, by the BLER of the value of j under this CQI from 0 to MCSfinal (i, j)the BLER of the value being initialized as 0, j from 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); J from 0 to 28 so Times (i, j)be initialized as 1.
If the CQI of terminal to report occurs first time, then jump to step 302.
Step 302, according to the value of ACK/NACK, upgrades the BLER of CQI corresponding to ACK/NACK (i, j)and/or Δ MCS i.
Step 1, upgrades the BLER under this CQI (i, j):
According to the ACK/NACK reported, determine CQI and MCS that ACK/NACK is corresponding, its value is designated as i1 and j1 respectively.Record the frequency n that this CQI occurs i1with the frequency n ack reporting NACK i1, calculate closest to the long segmentation BLER for L of the window of present sub-frame under this CQI, wherein, the value of L can be 40TTI.
If report for ACK, then upgrade the BLER of j=0 ~ j1 under this CQI (i1, j)if report NACK, then upgrade the BLER of j=j1 ~ 28 under this CQI (i1, j).
BLER (i1, j)the renewal of value is carried out according to the following procedure:
For renewal BLER (i1, j)the MCS of parameter, wherein Times (i1, j)be less than or equal to the MCS of N, the value of N can be 200, upgrades BLER by formula 1 (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 time, NACK=0, when reporting NACK, NACK=1.Then to have updated BLER (i1, j)the Times of all MCS (i1, j)add 1.
For renewal BLER (i1, j)the MCS of parameter, wherein Times (i1, j)be greater than the MCS of N, upgrade BLER by formula 2 (i1, j), no longer upgrade and preserve Times simultaneously (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=, perform step 2, otherwise jump to step 303.
Step 2, upgrades Δ MCS i1, when meeting specified conditions, upgrade the flag bit whether this CQI enters stable state.
Particularly, if n i1be less than or equal to a certain threshold value n 0(desirable 40) and nack i1be less than or equal to another threshold value nack 0, preferably, n 0value can be 40, nack 0value can be 4, then Δ MCS i1constant; If n i1be greater than a certain threshold value n 0and nack i1be less than or equal to another threshold value nack 0, then Δ MCS i1constant, CQI_state i1=1; Otherwise Δ MCS i1subtract 1, n i1=0, nack i1=0.
Step 303, the determination of MCS:
According to the CQI reported, its value is designated as i2, if the CQI_state that CQI is corresponding i2=0, determine modulation coding mode MCS as follows:
1, according to CQI-MCSinit mapping relations table, the value i2 of channel quality indicator (CQI) is mapped as modulation coding mode initial value MCSinit;
2, with the correction value Δ MCS that this CQI is corresponding i2modulation coding mode initial value MCSinit is revised, obtains modulation coding mode MCSfinal.Makeover process carries out as follows: by Δ MCS i2be added with modulation coding mode initial value MCSinit.
If the CQI_state that CQI is corresponding i2=1, select the BLER that this CQI is corresponding (i2, j)be less than or equal to the maximum j of a certain threshold value in (j=0 ~ 28), preferably, this threshold value desirable 8%, then judges the segmentation BLER under this CQI, if segmentation BLER is less than a certain threshold value B LER low, then j adds 1, otherwise j is constant, wherein, and BLER lowcan 2.5% be got; The modulation coding mode MCSfinal that namely j obtains.
The embodiment of the present invention, by the CQI for terminal to report, adds up different correction value Δ MCS isolve terminal in prior art and report the problem that different CQI accuracy is different, in addition, the state of CQI is divided into initial condition and stable state by the embodiment of the present invention, adopt different AMC flow processs under two states, thus suitable modulation coding mode can be selected more accurately; The embodiment of the present invention, by the BLER of each MCS under statistics CQI, is selected the maximum MCS satisfied condition, thus can be taken into account BLER performance and the maximum throughput performance of system according to the BLER threshold value of setting; The embodiment of the present invention, when upgrading the BLER state of CQI, according to the ACK/NACK reported, upgrades the BLER of the one group of MCS satisfied condition, thus can shorten the time of initialization procedure.
Device embodiment
According to embodiments of the invention, provide a kind of Adaptive Modulation and Coding device, Fig. 4 is the structural representation of the Adaptive Modulation and Coding device of the embodiment of the present invention, as shown in Figure 4, Adaptive Modulation and Coding device according to the embodiment of the present invention comprises: CQI initialization module 40, CQI state updating module 41, MCS correcting module 42 and MCS select correcting module 43, are described in detail below to the modules of the embodiment of the present invention.
CQI initialization module 40 is for when the CQI of terminal to report occurs first, the CQI of record terminal to report, initialization is carried out to the parameter of the CQI of terminal to report, wherein, parameter comprises: state flag bit, modulation coding mode correction value, the Block Error Rate of 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, state flag bit initialization module is used for the state flag bit in the parameter of the CQI that initialization terminal reports is labile state; Modulation coding mode correction value initialization module is used for modulation coding mode correction value corresponding with the CQI of terminal to report in the parameter of the CQI that initialization terminal reports; Block Error Rate initialization module is used for the Block Error Rate of the MCS that can select in the parameter of the CQI that initialization terminal reports; The access times that MCS access times initialization module is used for each MCS in the parameter of initialization CQI are 1.
Particularly, modulation coding mode correction value initialization module specifically for:
If the CQI of terminal to report is first CQI reported, then in the parameter of CQI that reports of initialization terminal, the modulation coding mode correction value corresponding with the CQI of terminal to report is zero;
If the CQI of terminal to report is be not first CQI reported, modulation coding mode correction value corresponding with the CQI of terminal to report in the parameter of the CQI then reported according to pre-defined rule initialization terminal, wherein, pre-defined rule comprises: determine in record, whether existence flag bit is the CQI of stable state, if existed, the then mean value of the modulation coding mode correction value of computing mode flag bit corresponding to the CQI of stable state, and after rounding downwards, modulation coding mode correction value corresponding with the CQI of terminal to report in the parameter of the CQI that initialization terminal reports is the value obtained after this mean value rounds downwards, if there is no state flag bit is the CQI of stable state, then calculate the mean value of the modulation coding mode correction value corresponding to all CQI in record except the CQI of this record, and after rounding downwards, modulation coding mode correction value corresponding with the CQI of terminal to report in the parameter of the CQI that initialization terminal reports is the value obtained after this mean value rounds downwards.
Block Error Rate initialization module specifically comprises: mapping submodule, correction submodule and initialization submodule, and 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 MCS initial value; Revise submodule to revise in a predefined manner MCS initial value for the modulation coding mode correction value corresponding to the CQI of terminal to report, obtain revised MCS, wherein, the span of revised MCS is 0 to 28, above-mentioned reservation mode for: the modulation coding mode correction value corresponding to the CQI of terminal to report is added with MCS initial value; Initialization submodule is used for the Block Error Rate of the value j of MCS under the CQI of terminal to report from 0 to final MCS to be initialized as 0, the Block Error Rate of j under the CQI of terminal to report from final MCS+1 to 28 is initialized as 1, wherein, the span of j is 0 to 28, represents the value of 29 kinds of MCS.
CQI state updating module 41 is for the positive acknowledgement ACK/ Negative Acknowledgement NACK according to terminal to report, upgrade the Block Error Rate of the CQI corresponding with ACK/NACK, and when the state flag bit of the CQI corresponding with ACK/NACK is labile state, upgrade modulation coding mode correction value and the state flag bit of the CQI corresponding with ACK/NACK further;
Particularly, CQI state updating module 41 specifically for:
According to the ACK/NACK of terminal to report, determine CQI and MCS corresponding with the ACK/NACK of terminal to report, record the frequency n that the CQI corresponding with the ACK/NACK of terminal to report occurs i1and report the frequency n ack of NACK i1and closest to the segmentation Block Error Rate that the window of present sub-frame is long under calculating the CQI corresponding with the ACK/NACK of terminal to report, wherein, the value of CQI and MCS corresponding with the ACK/NACK of terminal to report is respectively i1 and j1, the span of i is 0 to 15, represent the value of CQI in 16, the span of j is 0 to 28, represents the value of 29 kinds of MCS;
If that terminal to report is ACK, then the block error rate BLER of j=0 ~ j1 under the CQI that renewal is 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);
Determine to upgrade BLER (i1, j)corresponding MCS, and determine the access times Times of this MCS (i1, j)whether be less than or equal to the threshold value N pre-set, if so, then upgrade BLER according to formula 1 (i1, j), and to have updated 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 equation 1, when terminal to report be ACK time, NACK=0, when terminal to report be NACK time, NACK=1;
When the state flag bit of the CQI corresponding with ACK/NACK is labile state, in the frequency n that the CQI corresponding with the ACK/NACK of terminal to report occurs i1be less than or equal to the threshold value n pre-set 0and report the frequency n ack of NACK i1be less than or equal to the threshold value nack pre-set 0when, the modulation coding mode correction value Δ MCS of the CQI corresponding with ACK/NACK i1constant;
In the frequency n that the CQI corresponding with the ACK/NACK of terminal to report occurs i1be greater than the threshold value n pre-set 0and report the frequency n ack of NACK i1be less than or equal to the threshold value nack pre-set 0when, Δ MCS i1constant, the state flag bit CQI_state of the CQI corresponding with ACK/NACK i1=1;
Except above-mentioned two situations, Δ MCS i1subtract 1, n i1=0, nack i1=0.
MCS correcting module 42 is unstable for the state flag bit of the CQI at terminal to report, the modulation coding mode correction value according to the CQI of terminal to report and the CQI of terminal to report obtains final MCS;
Particularly, above-mentioned MCS correcting module 42 specifically for:
1, 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 MCS initial value; 2, the modulation coding mode correction value Δ MCS corresponding to the CQI of terminal to report i2mCS initial value is revised in a predefined manner, obtains final MCS, wherein, above-mentioned reservation mode for: the modulation coding mode correction value corresponding to the CQI of terminal to report is added with MCS initial value.
MCS selects correcting module 43 to be stable for the state flag bit of the CQI at terminal to report, the Block Error Rate corresponding to the CQI of terminal to report and the CQI of terminal to report determines final MCS.
Particularly, MCS select correcting module 43 specifically for:
1, the block error rate BLER corresponding to CQI of terminal to report is selected (i2, j)in, be less than or equal to the maximum j of predetermined threshold value; 2, according to the segmentation Block Error Rate under the CQI of terminal to report, judge whether segmentation Block Error Rate is less than the thresholding BLER pre-set low, if the judgment is Yes, then j adds 1, otherwise j is constant; 3, final MCS is determined according to the value of j.
In sum, the embodiment of the present invention, by the CQI for terminal to report, adds up different correction value Δ MCS isolve terminal in prior art and report the problem that different CQI accuracy is different, in addition, the state of CQI is divided into initial condition and stable state by the embodiment of the present invention, adopt different AMC flow processs under two states, thus suitable modulation coding mode can be selected more accurately; The embodiment of the present invention, by the BLER of each MCS under statistics CQI, is selected the maximum MCS satisfied condition, thus can be taken into account BLER performance and the maximum throughput performance of system according to the BLER threshold value of setting; The embodiment of the present invention, when upgrading the BLER state of CQI, according to the ACK/NACK reported, upgrades the BLER of the one group of MCS satisfied condition, thus can shorten the time of initialization procedure.
Although be example object, disclose the preferred embodiments of the present invention, it is also possible for those skilled in the art will recognize various improvement, increase and replacement, and therefore, scope of the present invention should be not limited to above-described embodiment.

Claims (16)

1. an adaptive modulation coding method, is characterized in that, comprising:
Step 1, when determining that the channel quality indicator (CQI) of terminal to report occurs first, record the CQI of described terminal to report, initialization is carried out to the parameter of the CQI of described terminal to report, and perform step 2, when determining that the CQI of described terminal to report is non-and occurring first, directly perform step 2, wherein, described parameter comprises: state flag bit, modulation coding mode correction value, the Block Error Rate of modulation coding mode MCS that can select and the access times of each MCS; Carry out initialization to the parameter of the CQI of described terminal to report specifically to comprise: state flag bit described in initialization is labile state;
Step 2, according to the positive acknowledgement ACK/ Negative Acknowledgement NACK of described terminal to report, upgrade the Block Error Rate of the CQI corresponding with described ACK/NACK, and when the state flag bit of the CQI corresponding with described ACK/NACK is labile state, the modulation coding mode correction value of the CQI that further renewal is corresponding with described ACK/NACK and state flag bit, perform step 3; Wherein, the state flag bit upgrading the CQI corresponding with described ACK/NACK specifically comprises: the frequency n occurred at the CQI corresponding with the ACK/NACK of described terminal to report i1be greater than the threshold value n pre-set 0and report the frequency n ack of described NACK i1be less than or equal to the threshold value nack pre-set 0when, the state flag bit of the CQI corresponding with described ACK/NACK is stable state;
Step 3, when the state flag bit of the CQI of described terminal to report is unstable, modulation coding mode correction value according to the CQI of described terminal to report and the CQI of described terminal to report obtains final MCS, when the state flag bit of the CQI of described terminal to report is stable, select the block error rate BLER corresponding to CQI of described terminal to report (i2, j)in, be less than or equal to the maximum j of predetermined threshold value; According to the Block Error Rate under the CQI of described terminal to report, judge whether described Block Error Rate is less than the thresholding BLER pre-set low, if the judgment is Yes, then j adds 1, otherwise j is constant; Determine final MCS according to the value of j, wherein, the span of i is 0 to 15, and represent the value of 16 kinds of CQI, the span of j is 0 to 28, represents the value of 29 kinds of MCS.
2. the method for claim 1, is characterized in that, when the CQI of described terminal to report occurs first, carries out initialization also comprise the parameter of the CQI of described terminal to report:
Modulation coding mode correction value corresponding with the CQI of described terminal to report in the parameter of the CQI of terminal to report described in initialization;
The Block Error Rate of the MCS that can select described in the parameter of the CQI of terminal to report described in initialization;
The access times of each MCS described in the parameter of CQI described in initialization are 1.
3. method as claimed in claim 2, it is characterized in that, modulation coding mode correction value corresponding with the CQI of described terminal to report in the parameter of the CQI of terminal to report described in initialization specifically comprises:
If the CQI of described terminal to report is first CQI reported, then in the parameter of the CQI of terminal to report described in initialization, the modulation coding mode correction value corresponding with the CQI of described terminal to report is zero;
If the CQI of described terminal to report is be not first CQI reported, modulation coding mode correction value corresponding with the CQI of described terminal to report in parameter then according to the CQI of terminal to report described in pre-defined rule initialization, wherein, described pre-defined rule comprises: determine in record, whether existence flag bit is the CQI of stable state, if existed, then calculate the mean value of the modulation coding mode correction value of described state flag bit corresponding to the CQI of stable state, and after rounding downwards, modulation coding mode correction value corresponding with the CQI of described terminal to report in the parameter of the CQI of terminal to report described in initialization is the value obtained after this mean value rounds downwards, if there is no described state flag bit is the CQI of stable state, then calculate the mean value of the modulation coding mode correction value corresponding to all CQI in record except the CQI of this record, and after rounding downwards, modulation coding mode correction value corresponding with the CQI of described terminal to report in the parameter of the CQI of terminal to report described in initialization is the value obtained after this mean value rounds downwards.
4. method as claimed in claim 2, it is characterized in that, the Block Error Rate of the MCS that can select described in the parameter of the CQI of terminal to report described in initialization comprises:
According to the mapping relations table of CQI and MCS initial value, the CQI of described terminal to report is mapped as MCS initial value;
Modulation coding mode correction value corresponding to the CQI of described terminal to report is revised in a predefined manner to described MCS initial value, obtains revised MCS, and wherein, the span of described revised MCS is 0 to 28;
The Block Error Rate of the value j of MCS under the CQI of described terminal to report from 0 to final MCS is initialized as 0, and the Block Error Rate of j under the CQI of described terminal to report from final MCS+1 to 28 is initialized as 1, and wherein, the span of j is 0 to 28, represents the value of 29 kinds of MCS.
5. the method for claim 1, is characterized in that, according to the ACK/NACK of described terminal to report, the Block Error Rate upgrading the CQI corresponding with described ACK/NACK comprises:
According to the ACK/NACK of described terminal to report, determine CQI and MCS corresponding with the ACK/NACK of described terminal to report, record the frequency n that the CQI corresponding with the ACK/NACK of described terminal to report occurs i1and report the frequency n ack of described NACK i1, and closest to the Block Error Rate that the window of present sub-frame is long under calculating the CQI corresponding with the ACK/NACK of described terminal to report, wherein, the value of CQI and MCS corresponding with the ACK/NACK of described terminal to report is respectively i1 and j1;
If that described terminal to report is ACK, then the block error rate BLER of j=0 ~ j1 under the CQI that renewal is corresponding with the ACK of described terminal to report (i1, j)if, described terminal to report be NACK, then upgrade the block error rate BLER of j=j1 ~ 28 under the CQI corresponding with the NACK of described terminal to report (i1, j).
6. method as claimed in claim 5, is characterized in that, upgrade the block error rate BLER of the CQI corresponding with described ACK/NACK (i1, j)specifically comprise:
Determine to upgrade BLER (i1, j)corresponding MCS, and determine the access times Times of this MCS (i1, j)whether be less than or equal to the threshold value pre-set, if so, then upgrade described BLER according to formula 1 (i1, j), and to have updated BLER (i1, j)the Times of all MCS (i1, j)add 1; Otherwise, upgrade described BLER according to formula 2 (i1, j);
BL ER ( 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 described formula 1, when described terminal to report be ACK time, NACK=0, when described terminal to report be NACK time, NACK=1, in described formula 2, N for judge upgrade BLER (i1, j)the access times Times of corresponding MCS (i1, j)the threshold value pre-set of size.
7. the method for claim 1, is characterized in that, when the state flag bit of the CQI corresponding with described ACK/NACK is labile state, the modulation coding mode correction value upgrading the CQI corresponding with described ACK/NACK further specifically comprises:
In the frequency n that the CQI corresponding with the ACK/NACK of described terminal to report occurs i1be less than or equal to the threshold value n pre-set 0and report the frequency n ack of described NACK i1be less than or equal to the threshold value nack pre-set 0when, the modulation coding mode correction value Δ MCS of the CQI corresponding with described ACK/NACK i1constant;
In the frequency n that the CQI corresponding with the ACK/NACK of described terminal to report occurs i1be greater than the threshold value n pre-set 0and report the frequency n ack of described NACK i1be less than or equal to the threshold value nack pre-set 0when, described Δ MCS i1constant;
Except above-mentioned two situations, described Δ MCS i1subtract 1, n i1=0, nack i1=0.
8. the method for claim 1, it is characterized in that, when the state flag bit of the CQI of described terminal to report is unstable, obtains final MCS according to the modulation coding mode correction value of the CQI of described terminal to report and the CQI of described terminal to report and specifically comprise:
According to the mapping relations table of CQI and MCS initial value, the value i2 of the CQI of described terminal to report is mapped as MCS initial value;
Modulation coding mode correction value Δ MCS corresponding to the CQI of described terminal to report i2described MCS initial value is revised in a predefined manner, obtains described final MCS.
9. the method as described in claim 4 or 8, is characterized in that, described predetermined way comprises:
Modulation coding mode correction value corresponding to the CQI of described terminal to report is added with described MCS initial value.
10. an Adaptive Modulation and Coding device, is characterized in that, comprising:
CQI initialization module, for when determining that the CQI of terminal to report occurs first, record the CQI of described terminal to report, initialization is carried out to the parameter of the CQI of described terminal to report, wherein, described parameter comprises: state flag bit, modulation coding mode correction value, the Block Error Rate of modulation coding mode MCS that can select and the access times of each MCS; Described CQI initialization module specifically comprises: state flag bit initialization module, is labile state for the state flag bit in the parameter of the CQI of terminal to report described in initialization;
CQI state updating module, for the positive acknowledgement ACK/ Negative Acknowledgement NACK according to described terminal to report, upgrade the Block Error Rate of the CQI corresponding with described ACK/NACK, and when the state flag bit of the CQI corresponding with described ACK/NACK is labile state, upgrade modulation coding mode correction value and the state flag bit of the CQI corresponding with described ACK/NACK further; Described CQI state updating module is specifically for the frequency n occurred at the CQI corresponding with the ACK/NACK of described terminal to report i1be greater than the threshold value n pre-set 0and report the frequency n ack of described NACK i1be less than or equal to the threshold value nack pre-set 0when, the state flag bit CQI_state of the CQI corresponding with described ACK/NACK i1for stable state;
MCS correcting module, the state flag bit for the CQI at described terminal to report is unstable, the modulation coding mode correction value according to the CQI of described terminal to report and the CQI of described terminal to report obtains final MCS;
MCS selects correcting module, state flag bit for the CQI at described terminal to report is stable, Block Error Rate corresponding to the CQI of described terminal to report and the CQI of described terminal to report determines final MCS, wherein, described MCS selects correcting module specifically for block error rate BLER corresponding to the CQI selecting described terminal to report (i2, j)in, be less than or equal to the maximum j of predetermined threshold value; According to the described Block Error Rate under the CQI of described terminal to report, judge whether described Block Error Rate is less than the thresholding BLER pre-set low, if the judgment is Yes, then j adds 1, otherwise j is constant; Determine that the span of final MCS, i is 0 to 15 according to the value of j, represent the value of CQI in 16, the span of j is 0 to 28, represents the value of 29 kinds of MCS.
11. devices as claimed in claim 10, it is characterized in that, described CQI initialization module also comprises:
Modulation coding mode correction value initialization module, for modulation coding mode correction value corresponding with the CQI of described terminal to report in the parameter of the CQI of terminal to report described in initialization;
Block Error Rate initialization module, for the CQI of terminal to report described in initialization parameter described in the Block Error Rate of MCS that can select;
MCS access times initialization module, for CQI described in initialization parameter described in the access times of each MCS be 1.
12. devices as claimed in claim 11, is characterized in that, described modulation coding mode correction value initialization module specifically for:
If the CQI of described terminal to report is first CQI reported, then in the parameter of the CQI of terminal to report described in initialization, the modulation coding mode correction value corresponding with the CQI of described terminal to report is zero;
If the CQI of described terminal to report is be not first CQI reported, modulation coding mode correction value corresponding with the CQI of described terminal to report in parameter then according to the CQI of terminal to report described in pre-defined rule initialization, wherein, described pre-defined rule comprises: determine in record, whether existence flag bit is the CQI of stable state, if existed, then calculate the mean value of the modulation coding mode correction value of described state flag bit corresponding to the CQI of stable state, and after rounding downwards, modulation coding mode correction value corresponding with the CQI of described terminal to report in the parameter of the CQI of terminal to report described in initialization is the value obtained after this mean value rounds downwards, if there is no described state flag bit is the CQI of stable state, then calculate the mean value of the modulation coding mode correction value corresponding to all CQI in record except the CQI of this record, and after rounding downwards, modulation coding mode correction value corresponding with the CQI of described terminal to report in the parameter of the CQI of terminal to report described in initialization is the value obtained after this mean value rounds downwards.
13. devices as claimed in claim 11, it is characterized in that, described Block Error Rate initialization module specifically comprises:
Mapping submodule, for the mapping relations table according to CQI and MCS initial value, is mapped as MCS initial value by the CQI of described terminal to report;
Revise submodule, revise in a predefined manner described MCS initial value for the modulation coding mode correction value corresponding to the CQI of described terminal to report, obtain revised MCS, wherein, the span of described revised MCS is 0 to 28;
Initialization submodule, for the Block Error Rate of the value j of MCS under the CQI of described terminal to report from 0 to final MCS is initialized as 0, the Block Error Rate of j under the CQI of described terminal to report from final MCS+1 to 28 is initialized as 1, wherein, the span of j is 0 to 28, represents the value of 29 kinds of MCS.
14. devices as claimed in claim 10, is characterized in that, described CQI state updating module specifically for:
According to the ACK/NACK of described terminal to report, determine CQI and MCS corresponding with the ACK/NACK of described terminal to report, record the frequency n that the CQI corresponding with the ACK/NACK of described terminal to report occurs i1and report the frequency n ack of described NACK i1, and closest to the Block Error Rate that the window of present sub-frame is long under calculating the CQI corresponding with the ACK/NACK of described terminal to report, wherein, the value of CQI and MCS corresponding with the ACK/NACK of described terminal to report is respectively i1 and j1;
If that described terminal to report is ACK, then the block error rate BLER of j=0 ~ j1 under the CQI that renewal is corresponding with the ACK of described terminal to report (i1, j)if, described terminal to report be NACK, then upgrade the block error rate BLER of j=j1 ~ 28 under the CQI corresponding with the NACK of described terminal to report (i1, j);
Determine to upgrade BLER (i1, j)corresponding MCS, and determine the access times Times of this MCS (i1, j)whether be less than or equal to the threshold value pre-set, if so, then upgrade described BLER according to formula 1 (i1, j), and to have updated BLER (i1, j)the Times of all MCS (i1, j)add 1; Otherwise, upgrade described BLER according to formula 2 (i1, j);
BL ER ( 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 described formula 1, when described terminal to report be ACK time, NACK=0, when described terminal to report be NACK time, NACK=1, in described formula 2, N for judge upgrade BLER (i1, j)the access times Times of corresponding MCS (i1, j)the threshold value pre-set of size;
When the state flag bit of the CQI corresponding with described ACK/NACK is labile state, in the frequency n that the CQI corresponding with the ACK/NACK of described terminal to report occurs i1be less than or equal to the threshold value n pre-set 0and report the frequency n ack of described NACK i1be less than or equal to the threshold value nack pre-set 0when, the modulation coding mode correction value Δ MCS of the CQI corresponding with described ACK/NACK i1constant;
In the frequency n that the CQI corresponding with the ACK/NACK of described terminal to report occurs i1be greater than the threshold value n pre-set 0and report the frequency n ack of described NACK i1be less than or equal to the threshold value nack pre-set 0when, described Δ MCS i1constant;
Except above-mentioned two situations, described Δ MCS i1subtract 1, n i1=0, nack i1=0.
15. devices as claimed in claim 10, is characterized in that, described MCS correcting module specifically for:
According to the mapping relations table of CQI and MCS initial value, the value i2 of the CQI of described terminal to report is mapped as MCS initial value;
Modulation coding mode correction value Δ MCS corresponding to the CQI of described terminal to report i2described MCS initial value is revised in a predefined manner, obtains described final MCS.
16. devices as described in claim 13 or 15, it is characterized in that, described predetermined way comprises:
Modulation coding mode correction value corresponding to the CQI of described terminal to report is added with described MCS initial value.
CN201010252688.4A 2010-08-13 2010-08-13 Adaptive modulation and coding method and adaptive modulation and coding device Expired - Fee Related CN102377508B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201010252688.4A CN102377508B (en) 2010-08-13 2010-08-13 Adaptive modulation and coding method and adaptive modulation and coding device
PCT/CN2010/079400 WO2012019403A1 (en) 2010-08-13 2010-12-02 Adaptive modulation and coding method and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201010252688.4A CN102377508B (en) 2010-08-13 2010-08-13 Adaptive modulation and coding method and adaptive modulation and coding device

Publications (2)

Publication Number Publication Date
CN102377508A CN102377508A (en) 2012-03-14
CN102377508B true CN102377508B (en) 2015-06-10

Family

ID=45567306

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201010252688.4A Expired - Fee Related CN102377508B (en) 2010-08-13 2010-08-13 Adaptive modulation and coding method and adaptive modulation and coding device

Country Status (2)

Country Link
CN (1) CN102377508B (en)
WO (1) WO2012019403A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102724016B (en) * 2012-06-05 2017-02-08 青岛艾特网络发展有限公司 Self-adaptive adjusting method and self-adaptive adjusting device of modulation and coding scheme
CN103516495B (en) * 2012-06-28 2017-11-28 中兴通讯股份有限公司 A kind of descending self-adapting modulation and coding method and device
CN103078704B (en) * 2012-12-28 2018-01-05 中兴通讯股份有限公司 A kind of method and system for managing modulation coding mode
CN105099600B (en) * 2014-04-18 2018-10-02 成都鼎桥通信技术有限公司 MCS dynamics select rank method, base station and monitor terminal in group service
KR20190002690A (en) * 2016-05-12 2019-01-08 후아웨이 테크놀러지 컴퍼니 리미티드 DATA TRANSMISSION METHOD, DEVICE, AND SYSTEM
CN108155973B (en) * 2018-01-03 2020-11-03 武汉虹信通信技术有限责任公司 Modulation coding strategy determining method and device
US10708112B2 (en) 2018-01-12 2020-07-07 At&T Intellectual Property I, L.P. Dynamic indication of higher order modulation and coding scheme table
US11184106B2 (en) * 2018-02-01 2021-11-23 Qualcomm Incorporated Modulation table determination and channel quality indicator reporting
CN111082892A (en) * 2018-10-19 2020-04-28 普天信息技术有限公司 Method and device for correcting SINR
CN113922925B (en) * 2021-10-09 2023-05-12 中国联合网络通信集团有限公司 Data transmission modulation class processing method, base station and storage medium
CN114978422B (en) * 2022-05-06 2024-03-19 Oppo广东移动通信有限公司 Channel quality indication CQI adjustment method, electronic device and storage medium

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101242566A (en) * 2007-02-08 2008-08-13 鼎桥通信技术有限公司 Transmission method, system and base station for multimedia broadcasting and multicast service
CN101686111A (en) * 2008-09-28 2010-03-31 华为技术有限公司 Method for issuing assignment information, device and communication system
WO2010045118A1 (en) * 2008-10-14 2010-04-22 Qualcomm Incorporated Methods and systems for pre-allocating a cqi channel during handover

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1960232A (en) * 2005-11-04 2007-05-09 大唐移动通信设备有限公司 Method for raising accuracy of indicating channel quality, and application
CN100426714C (en) * 2006-01-18 2008-10-15 华为技术有限公司 Method and device for channel quality indication calibrating and base station dispatching users data
CN101026429B (en) * 2006-02-17 2010-11-10 华为技术有限公司 Method for distributing high speed downlink sharing channels for multi carrier user device
KR101392342B1 (en) * 2007-08-17 2014-05-08 삼성전자주식회사 Multi-input multi-output communication method and multi-input multi-output communication system of enabling the method
CN101399630B (en) * 2007-09-24 2012-06-27 中国移动通信集团公司 Adaptive modulation coding method and apparatus
US20090161613A1 (en) * 2007-11-30 2009-06-25 Mark Kent Method and system for constructing channel quality indicator tables for feedback in a communication system
JP5388529B2 (en) * 2008-09-30 2014-01-15 株式会社日立国際電気 Wireless communication device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101242566A (en) * 2007-02-08 2008-08-13 鼎桥通信技术有限公司 Transmission method, system and base station for multimedia broadcasting and multicast service
CN101686111A (en) * 2008-09-28 2010-03-31 华为技术有限公司 Method for issuing assignment information, device and communication system
WO2010045118A1 (en) * 2008-10-14 2010-04-22 Qualcomm Incorporated Methods and systems for pre-allocating a cqi channel during handover

Also Published As

Publication number Publication date
WO2012019403A1 (en) 2012-02-16
CN102377508A (en) 2012-03-14

Similar Documents

Publication Publication Date Title
CN102377508B (en) Adaptive modulation and coding method and adaptive modulation and coding device
USRE46483E1 (en) Systems and methods for uplink power control
JP6030754B2 (en) Outer loop link adaptation for device restart
US11095393B2 (en) Outer loop link adaptation adjustment method and apparatus
CN101494515B (en) Down self-adapting modulation coding method and base station of OFDM system
WO2017050273A1 (en) Cqi information receiving method, sending method, receiving device and sending device
CN100553185C (en) The production method and the subscriber equipment of channel quality indication during high speed downlink packet inserts
CN102065534B (en) Power adjustment method and device
US10477431B2 (en) Method and apparatus for determining signal-to-noise ratio in wireless communication
US8737309B2 (en) Data packet transmission process based on a HARQ scheme for minimizing transmission power
CN105229956A (en) For the adaptive method and apparatus of enhancement mode slow speed link in wireless communication system
Cipriano et al. Calibration issues of PHY layer abstractions for wireless broadband systems
US11431543B2 (en) Facilitating a two-stage downlink control channel in a wireless communication system
CN107370564B (en) Polarization code processing method and device and node
CN115276908B (en) Wireless communication method, device and storage medium
CN101478364B (en) Adaptive modulation encoding method used for WCDMA network high-speed downlink packet access
CN102299770B (en) United coding method and system for long term evolution (LTE) uplink control information (UCI)
CN113228540A (en) Optimized link adaptation
CN115473607A (en) Communication method, communication device and readable storage medium
CN113037442B (en) Method and device for adjusting CCE aggregation level of control channel unit
EP2748940B1 (en) Method, network node, and computer program for determining rank
CN113890686A (en) Polarization code processing method and device and node
CN102263608A (en) Method and system for adaptive modulation and coding
CN108242974B (en) Method and device for dynamically adjusting CQI based on error rate and mobile terminal
CN102264099B (en) Adaptive Modulation and Coding (AMC) apparatus and method thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
EE01 Entry into force of recordation of patent licensing contract

Application publication date: 20120314

Assignee: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD.

Assignor: ZTE Corporation

Contract record no.: 2015440020319

Denomination of invention: Adaptive modulation coding method and apparatus

Granted publication date: 20150610

License type: Common License

Record date: 20151123

LICC Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model
CB03 Change of inventor or designer information

Inventor after: Xu Qiang

Inventor before: Wang Xiwei

Inventor before: Yao Chunfeng

Inventor before: Zhang Juan

CB03 Change of inventor or designer information
TR01 Transfer of patent right

Effective date of registration: 20171016

Address after: 300380 1 door, 10 building, E District, clear water home, Xiqing District, Tianjin, 302

Patentee after: Xu Qiang

Address before: 518057 Nanshan District Guangdong high tech Industrial Park, South Road, science and technology, ZTE building, Ministry of Justice

Patentee before: ZTE Corporation

TR01 Transfer of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150610

Termination date: 20180813

CF01 Termination of patent right due to non-payment of annual fee