CN1173502C - Self adaptable adjusting method for modulating code mode - Google Patents
Self adaptable adjusting method for modulating code mode Download PDFInfo
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- CN1173502C CN1173502C CNB011420073A CN01142007A CN1173502C CN 1173502 C CN1173502 C CN 1173502C CN B011420073 A CNB011420073 A CN B011420073A CN 01142007 A CN01142007 A CN 01142007A CN 1173502 C CN1173502 C CN 1173502C
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Abstract
The present invention discloses a self-adaptable adjusting method for modulating encoding schemes, which at least comprises the following steps: the provided modulating encoding scheme is divided into more than one large level, and each large level comprises more than one small level; a base station calculates the ratio SIR#-<est> of signals to interference of received data, and simultaneously receives cyclic redundancy check (CRC) results returned by a mobile station; the base station implements coarse adjustment or fine adjustment to encoding levels according to the SIR#-<est> value and the CRC check results, the coarse adjustment is implemented in the way of adjusting, modulating and encoding large levels according to the data transmission CRC check results received by the base station, and the fine adjustment is implemented in the way of adjusting the encoding small levels according to the comparative results of the ratio SIR#-<est> of signals to interference and the reference value of the ratio SIR#-<target> of reference signals to interference. The method of the present invention is used for adjusting and modulating the encoding schemes in real time according to transmission conditions so as to further enhance the capacity for signals to fit a channel and the reliability of signal transmission and avoid the occurrence of wrong adjustment.
Description
Technical field
The present invention relates to code level self adaptation adjustment technology, refer to a kind of method of utilizing the signal interference ratio parameter that obtains in real time and transfer of data check results at any time encoding scheme to be carried out accommodation especially.
Background of invention
At present, in the enhancement techniques of 3-G (Generation Three mobile communication system), the method of a kind of adaptively changing Modulation and Coding Scheme (AMC) has been proposed, this method is that the rank with modulating-coding is divided into eight grades, as shown in Table 1, when channel condition changes, the rank of modulating-coding progression (MCS) also will be adjusted up or down automatically according to the quality of channel condition, and will be good with the transmission performance that guarantees signal.Table one has provided eight grades of alternative Modulation and Coding Scheme:
| Code level | Modulation scheme | Encoding scheme (information bit/total bit) |
| 1 | Quaternary PSK (QPSK) | 1/4 |
| 2 | Quaternary PSK (QPSK) | 1/2 |
| 3 | Quaternary PSK (QPSK) | 3/4 |
| 4 | 8 phase shift keyings (8PSK) | 3/4 |
| 5 | 16 rank quadrature amplitude modulation (16QAM) | 1/2 |
| 6 | 16 rank quadrature amplitude modulation (16QAM) | 3/4 |
| 7 | 64 rank quadrature amplitude modulation (64QAM) | 1/2 |
| 8 | 64 rank quadrature amplitude modulation (64QAM) | 3/4 |
Table one Modulation and Coding Scheme
Numeral in table one encoding scheme " 1/4 " is to represent to transmit altogether 4 bits, and wherein 1 bit is an information bit, and all the other 3 bits are redundant bit; In like manner, 2 bits are transmitted in " 1/2 " expression altogether, and 1 bit is an information bit, and 1 bit is a redundant bit; Other all by that analogy.
But in actual applications, specifically should and how to carry out adjustment between the encoding scheme according to what standard, that is to say, when channel is in any conditioned disjunction signal transmission quality and is in what state, code level should raise, code level should be reduced in what situations, and what is transferred, and does not all have the implementation of determining so far.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of self-adapting regulation method of Modulation and Coding Scheme, it can adjust Modulation and Coding Scheme in real time according to the transmission situation, and then improves the ability of signal adaptation channel and the reliability of signal transmission, and can avoid the adjustment that makes a mistake.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of self-adapting regulation method of Modulation and Coding Scheme comprises the steps: at least
A. the Modulation and Coding Scheme that is provided is divided into more than one large level, comprises little rank more than in each large level;
B. the signal interference ratio value SIR that receives data is calculated in the base station
Est, receive the Cyclic Redundancy Check result that mobile radio station returns simultaneously;
C. count the CRC check result who is received the base station, and keep frequency threshold value to adjust the modulating-coding large level according to the transfer of data successful respond (ACK) of current count value and setting; Simultaneously, the SIR that calculates according to step b
EstValue and benchmark signal interference ratio reference value SIR
TargetComparative result the little rank of encoding is adjusted.
Wherein, described CRC check result comprises that transfer of data successful respond (ACK) or data transmission fails reply (NACK).
The step c of this method further comprises the steps:
C1. the base station relatively receives data signal interference ratio value SIR
EstWith benchmark signal interference ratio reference value SIR
Target
If SIR c2.
Est＞SIR
Target, then little rank m adds 1, if m has reached other maximum of the medium and small level of this large level, and the base station ACK cycle count that verification is produced to current C RC then, and whether judge the ACK cycle count greater than ACK maintenance frequency threshold value, if greater than, then large level adds 1; If less than, judge again whether the ACK cycle count keeps frequency threshold value less than ACK, if less than, then keep existing encoding scheme rank; If be not less than, then judge whether to receive NACK, if receive, then little rank m subtracts 1, returns step c1;
If SIR c3.
Est＜SIR
Target, judge then whether the present encoding rank has been the minimum little rank of minimum large level, if the minimum little rank of minimum large level then keeps existing code level, and finishes this adjustment; If not the minimum little rank of minimum large level, then little rank m subtracts 1; When the little rank of coding was in the lowermost level of this large level, cycle index was in first degree number of times, if the lowermost level number of times keeps frequency threshold value greater than lowermost level, then large level subtracts 1; If keep frequency threshold value smaller or equal to lowermost level, then keep existing rank, lowermost level keeps the frequency threshold value counter to add 1; Return step c1.
This method further comprises: calculate benchmark signal interference ratio reference value SIR in advance
Target, this value is calculated resulting CRC check result by radio network controller (RNC) to its each base station of administering and is carried out grand diversity and merge and draw.In addition, preestablish ACK and keep frequency threshold value and lowermost level to keep frequency threshold value, it is that speed according to the feedback time of ACK or NACK in the actual engineering and channel variation compares and obtains that this ACK keeps frequency threshold value and lowermost level to keep frequency threshold value.
The key of the inventive method is: Modulation and Coding Scheme is divided into large level and little rank, between large level, adopt the accuracy height but the slightly poor CRC check result of real-time as the coarse adjustment criterion, between little rank, adopt real-time but SIR valuation comparative result that accuracy is lower slightly is adjusted as the fine tuning criterion.
So, the present invention is by carrying out large level and other division of little level to Modulation and Coding Scheme, and adopt different decision rule that different modulation levels is carried out coarse adjustment and fine tuning, can choose suitable Modulation and Coding Scheme according to channel variation more accurately to the adjustment of MCS when making it guarantee transfer of data, thereby improve the performance and the signal transfer quality of system.Reach the ability that in transmission, improves the signal adaptation channel by these adjustment, avoid the adjustment that makes a mistake.
Description of drawings
Fig. 1 is the schematic diagram of realization mechanism of the present invention present position in system;
The flow chart that Fig. 2 realizes for the inventive method.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The method applied in the present invention is: at first will have alternative eight grades of Modulation and Coding Scheme now and be divided into N large level, each large level comprises m little rank again, according to the quality of the channel condition or the signal quality of reality, between large level or little rank, adjust then.Select the criterion that encoding scheme adopted between the large level, the present invention is referred to as coarse adjustment; Select the criterion that encoding scheme adopted between little rank, the present invention is referred to as fine tuning.Realize the position of MCS control adjustment mechanism of the present invention in whole system as shown in Figure 1, it is to guarantee under the situation that channel condition changes really, carries out the adjustment between the rank again, thereby guarantees the correctness that MCS selects.
Referring to shown in Figure 2, MCS is divided into three large levels, promptly N=3 is an example, specifies method of the present invention.Generally, when total encoding scheme was 8, N selected 3 for best.
Suppose that communication system adopts many Modulation and Coding Scheme, and adopt Cyclic Redundancy Check as the coarse adjustment criterion, signal interference ratio (SIR) is measured as the fine tuning criterion.The parameter that relates in the inventive method: SIR
EstBe the signal interference ratio estimated value, this value is the signal interference ratio estimated value to pilot channel (IPCH) in Frequency Division Duplexing (FDD) (FDD) system, and should be worth for time division duplex (TDD) system then is that the Midamble sign indicating number is estimated and the signal interference ratio estimated value that draws; SIR
TargetIt is the signal interference ratio estimated value that external circule power control forms, this value is calculated resulting CRC check result by radio network controller (RNC) to its each base station of administering and is carried out grand diversity and merge and draw, because this value changes very slow, can be used as benchmark signal interference ratio reference value, so-called outer shroud is meant the signaling loop between base station and the mobile switching centre; N is the large level number; M is little number of levels; N is that data are successfully transmitted the maintenance number of times of (ACK), and n is that the speed according to ACK/NACK feedback time on the concrete engineering and channel variation compares and obtains.Such as: slowly approximate 3 times ACK/NACK feedback time n=3 then greatly when channel variation rate; When channel variation rate comparatively fast smaller or equal to ACK/NACK feedback time, then n=1.Set n=3 in the present embodiment.Then eight grades of encoding schemes be divided into three large levels the MCS hierarchical table shown in table two～four:
| Code level | Modulation scheme | Encoding scheme (information bit/total bit) |
| 1 | QPSK | 1/4 |
| 2 | QPSK | 1/2 |
| 3 | QPSK | 3/4 |
Modulation and Coding Scheme during table two large level N=1
| Code level | Modulation scheme | Encoding scheme (information bit/total bit) |
| 1 | 8PSK | 3/4 |
| 2 | 16QAM | 1/2 |
| 3 | 16QAM | 3/4 |
Modulation and Coding Scheme during table three large level N=2
| Code level | Modulation scheme | Encoding scheme (information bit/total bit) |
| 1 | 64QAM | 1/2 |
| 2 | 64QAM | 3/4 |
Modulation and Coding Scheme during table four large level N=3
The present invention is transmitted the encoding scheme QPSK 1/4 when adopting large level N=1 and little rank m=1 for the first time in the process of carrying out transfer of data; Afterwards, the base station is calculated, compares, is differentiated the SIR of user data channel in real time, and detects the CRC check result who is received in real time, according to judged result and check results code level is adjusted in real time, to guarantee signal transmission quality, this adjustment process may further comprise the steps at least:
1) calculate the SIR of user data channel in real time the base station, obtains SIR
Est
2) to SIR
EstAnd SIR
TargetCompare, if SIR
Est＞SIR
Target, illustrate according to the current demand signal quality condition and can consider that code level suitably adjusts upward, then little rank m is added 1, if m has reached 3, can then considering be with large level to raising one-level? at this moment, just the CRC check result who is received with the base station is a foundation, the base station ACK cycle count that verification is produced to current C RC, and judge that whether ACK is greater than 3, if continuous three data transfer success is represented in ACK number＞3, illustrate that current channel condition is good, then N adds 1, and large level is transferred to N+1; If ACK number＜3 illustrate that current channel condition is not suitable for supporting the encoding scheme of higher level, then keep existing encoding scheme rank; If during the ACK counting, receive a NACK, current channel condition variation is described, then little rank m subtracts 1, reduces one-level.Afterwards, return step 1).
3) if SIR
Est＜SIR
Target, illustrate that current demand signal is second-rate, should suitably reduce the rank of encoding scheme, judge then whether the present encoding rank has been the minimum little rank of minimum large level? if then keep existing code level, and finish this adjustment; Otherwise m subtracts 1, and code level is reduced one-level; When the little rank of coding was in the lowermost level of this large level, record was in first degree number of times, if greater than three times, then N subtracts 1, and large level is reduced one-level; Otherwise, keeping existing rank, counter adds 1.Afterwards, return step 1).
Above-mentioned judgement and adjustment process can be carried out following statement by circulation and realize:
If SIRest＞SIRtargetthen { MCS+1; Until MCS=3 also begins the ACK that CRC check produces is counted; { ACK number＞3 then of if jumps to level n+1; ACK number＜3 of else if then MCS rank keeps; Else if obtains the MCS-1 of NACK then rank inside; { if MCS is that QPSK 1/4 then MCS remains unchanged to else if SIRest＜SIRtarget then, jumps out this circulation; The MCS-1 of else rank inside; { if is in the large level number-1 of other first degree number of times at the corresponding levels＞3 then MCS to until other lowermost level at the corresponding levels;＜!--SIPO＜DP n=" 6 "〉--〉＜dp n=" d6 "/else{ maintenance other lowermost level at the corresponding levels; Lowermost level counter+1;
Two kinds of decision rules being adopted in the present embodiment are: with the CRC check result is the coarse adjustment criterion of foundation and to differentiate the result with the SIR estimated value be the fine tuning criterion of foundation.Wherein, coarse adjustment is to judge rise or downward modulation code level according to ACK as a result or NACK that CRC check produces, because CRC check result's transmission has several data blocks time-delays (TTI), real-time is not fine, but its accuracy is higher, therefore is applicable to the adjustment not high to delay requirement.And fine tuning is according to the comparative result of sir measurement value and fiducial value code level to be raised or downward modulation, and the real-time of sir measurement is better, but accuracy is applicable to adjustment not high to the channel quality estimation accuracy requirement between little rank not as the CRC height.
The present invention has taken all factors into consideration the complementarity of these two kinds of superior parts of criterion just, the modulating-coding rank is divided into large level and little rank, adopt different decision rule carrying out coarse adjustment between the large level or between little rank, carrying out fine tuning respectively, thereby make code level adjustment adaptive channel variation more in real time, choose suitable Modulation and Coding Scheme exactly, avoided causing systemic loss of energy, and then guaranteed signal transmission quality because the rank adjustment is improper.
Claims (7)
1, a kind of self-adapting regulation method of Modulation and Coding Scheme is characterized in that this method comprises the steps: at least
A. the Modulation and Coding Scheme that is provided is divided into more than one large level, comprises little rank more than in each large level;
B. the signal interference ratio value SIR that receives data is calculated in the base station
Est, receive the cyclic redundancy check (CRC) result that mobile radio station returns simultaneously;
C. count the CRC check result who is received the base station, and keep frequency threshold value to adjust the modulating-coding large level according to the transfer of data successful respond ACK of current count value and setting; Simultaneously, the SIR that calculates according to step b
EstValue and benchmark signal interference ratio reference value SIR
TargetComparative result the little rank of encoding is adjusted.
2, method according to claim 1 is characterized in that: described CRC check result replys NACK for transfer of data successful respond ACK or data transmission fails.
3, method according to claim 1 is characterized in that step c further comprises the steps:
C1. the base station relatively receives data signal interference ratio value SIR
EstWith benchmark signal interference ratio reference value SIR
Target
If SIR c2.
Est＞SIR
Target, then little rank m adds 1, if m has reached other maximum of the medium and small level of this large level, and the base station ACK cycle count that verification is produced to current C RC then, and whether judge the ACK cycle count greater than ACK maintenance frequency threshold value, if greater than, then large level adds 1; If less than, judge again whether the ACK cycle count keeps frequency threshold value less than ACK, if less than, then keep existing encoding scheme rank; If be not less than, then judge whether to receive NACK, if receive, then little rank m subtracts 1, returns step c1;
If SIR c3.
Est＜SIR
Target, judge then whether the present encoding rank has been the minimum little rank of minimum large level, if the minimum little rank of minimum large level then keeps existing code level, and finishes this adjustment; If not the minimum little rank of minimum large level, then little rank m subtracts 1; When the little rank of coding was in the lowermost level of this large level, cycle index was in first degree number of times, if the lowermost level number of times keeps frequency threshold value greater than lowermost level, then large level subtracts 1; If keep frequency threshold value smaller or equal to lowermost level, then keep existing rank, lowermost level keeps the frequency threshold value counter to add 1; Return step c1.
4, method according to claim 1 is characterized in that this method further comprises: calculate benchmark signal interference ratio reference value SIR in advance
Target, this value is calculated resulting CRC check result by radio network controller (RNC) to its each base station of administering and is carried out grand diversity and merge and draw.
5, method according to claim 1 is characterized in that this method further comprises: preestablish ACK and keep frequency threshold value and lowermost level to keep frequency threshold value.
6, method according to claim 5 is characterized in that: it is that speed according to the feedback time of actual ACK or NACK and channel variation compares and obtains that described ACK keeps frequency threshold value.
7, method according to claim 5 is characterized in that: it is that speed according to the feedback time of actual ACK or NACK and channel variation compares and obtains that described lowermost level keeps frequency threshold value.
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| CNB011420073A CN1173502C (en) | 2001-09-06 | 2001-09-06 | Self adaptable adjusting method for modulating code mode |
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|---|---|---|---|
| CNB011420073A CN1173502C (en) | 2001-09-06 | 2001-09-06 | Self adaptable adjusting method for modulating code mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007221178A (en) * | 2005-04-01 | 2007-08-30 | Ntt Docomo Inc | Transmitting apparatus and method |
| CN101141226B (en) * | 2006-09-08 | 2011-09-14 | 华为技术有限公司 | Modulation coding state regulation means, self-adaptive coding modulation method and system |
| CN101478765B (en) * | 2008-01-02 | 2014-03-12 | 中国移动通信集团上海有限公司 | Adaptive modulation encoding method used for TD-SCDMA network high speed downlink packet access |
| CN101227253B (en) * | 2008-02-01 | 2013-02-27 | 中兴通讯股份有限公司 | Dynamic state altering method of enhancement type general use grouping wireless business encoder mode |
| CN102196548B (en) * | 2010-03-10 | 2013-11-27 | 鼎桥通信技术有限公司 | Dynamic control method of channel coding gain |
| CN102348288B (en) * | 2010-07-30 | 2015-04-01 | 中兴通讯股份有限公司 | Dispatch method and evolvement-type base station |
| CN102833034B (en) * | 2011-06-16 | 2017-03-15 | 中兴通讯股份有限公司 | Determine the method and device of modulation coding mode |
| CN102299773B (en) * | 2011-09-21 | 2013-10-16 | 慈溪市供电局 | Adaptive modulation coding method for time division multiple access (TDMA) system and mobile terminal |
| 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 |
| CN103516463B (en) * | 2012-06-20 | 2017-05-31 | 南京中兴新软件有限责任公司 | A kind of method for carrying out outer shroud adaptive modulation and coding adjustment and base station |
| CN104283648B (en) * | 2013-07-10 | 2018-02-23 | 中国移动通信集团公司 | Feeding back confirmation message transmission method, the apparatus and system of WLAN |
| CN107219207B (en) * | 2017-07-04 | 2023-10-20 | 福州大学 | Automatic focusing method of CCD biochip fluorescence scanner |
| US10849131B2 (en) * | 2018-02-16 | 2020-11-24 | Qualcomm Incorporated | Bursty interference mitigation techniques |
| 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 |
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