CN102377513A - Adaptive modulation and coding method and device - Google Patents
Adaptive modulation and coding method and device Download PDFInfo
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- CN102377513A CN102377513A CN2010102609054A CN201010260905A CN102377513A CN 102377513 A CN102377513 A CN 102377513A CN 2010102609054 A CN2010102609054 A CN 2010102609054A CN 201010260905 A CN201010260905 A CN 201010260905A CN 102377513 A CN102377513 A CN 102377513A
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- 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
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
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- 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
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
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Abstract
The invention provides an adaptive modulation and coding method and an adaptive modulation and coding device. The method comprises the following steps of: acquiring a carrier interference and noise ratio (CINR) at a moment when a service is to be sent and acquiring a modulation and coding scheme (MCS) by looking up a table; acquiring a second adjusting quantity of the MCS during determination of a first adjusting quantity of the MCS; and determining a final MCS of the service sent at the next scheduling moment by acquiring the MCS as well as the first adjusting quantity and the second adjusting quantity of the MCS by looking up the table. By the method and the device, the problems of a waste of power and reduction of throughput caused by oversmall BLER and the problem that a requirement of a user on the quality of service (QoS) cannot be met caused by overlarge BLER within a BLER calibration statistical interval in the prior art can be solved.
Description
Technical field
The present invention relates to wireless communication technology field, the method and the device of Adaptive Modulation and Coding in particularly a kind of wireless communication system.
Background technology
AMC (Adaptive Modulation and Coding; Adaptive coding and modulating) is a kind of link adaptation techniques; Adopt more MCS (Modulation and Coding Scheme, modulation coding mode), the AMC technology is set the MCS of adaptive the best for each user terminal according to link-quality; Owing to the influence of fading that channel variation is caused to received signal, can significantly increase the throughput of system with compensation.In the AMC system, the general user terminal under the reasonable situation of channel quality with the modulation system of high-order and higher code rate, promptly higher MCS, and in bad channel quality, adopt lower MCS.
At present; In the high-speed data service of multiple wireless standard; Like the HSDPA among the WCDMA (Wide-band CodeDivision Multiple Access, WCDMA access system) (High SpeedDownlink Packet Access, high-speed downstream bag data insert) professional, WiMAX (WorldwideInteroperability for Microwave Access; Micro-wave access global inter communication) professional, LTE (LongTerm Evolution; Long Term Evolution) in the business, all adopted the AMC technology, it utilizes the modulation and the coded system of the current transmission packet of channel information adaptive determining.
Adaptive Modulation and Coding is through changing the dynamic adjustment mode signal of modulation coding mode, to adapt to transmitting terminal to the channel variation between the receiving terminal.With the LTE up link is example, introduces the practical implementation process of relevant AMC technology:
Uplink service signal or the detectable signal that send according to the terminal base station; Through CINR (the Carrier Interference and Noise Radio that measures current time; The carrier-in-interference noise ratio); And CINR has been carried out prediction obtain sending professional CINR constantly, the CINR that utilizes design in advance and MCS correspondence table (being that each MCS is pairing CINR value under 0.1 the condition at BLER), all are less than or equal to the pairing MCS of maximum CINR value in this prediction CINR value in the selection correspondence table.A calibration measurement period has been preset in the base station simultaneously; And in this measurement period, add up BLER (Block Error Rate; Block Error Rate), if, then increasing an adjusted value less than the first predetermined threshold value on MCS, active user's BLER obtains revised MCS; If active user's BLER then deducts an adjusted value and obtains revised MCS greater than predetermined second threshold value (wherein, first threshold value is not more than second threshold value) on MCS.Last base station is also revised MCS informing user terminal, and user terminal receives the back and adopts this MCS to send business.
But, when the CINR of prediction drops in the corresponding interval of certain MCS, according to existing AMC technology; The system of selection of adopting can be the corresponding MCS of this interval lower limit; Reduce the MCS of one-level on the corresponding MCS of higher limit that perhaps should the interval basis, when adopting after existing method obtains adjusted MCS, in BLER calibration statistics interval; BLER is probably much smaller than desired value 0.1, even BLER equals 0.For up link, this can cause the power dissipation problem of user terminal, and causes that the uplink service flow of user terminal descends, and then causes the throughput of whole up-link to descend.For down link, this can cause distributing to the power dissipation problem of user terminal, and causes that the downlink business flow of user terminal descends, and then causes the throughput of whole downlink system to descend.After adopting the MCS of existing method adjustment; In BLER calibration statistics interval, BLER probably can be far longer than desired value 0.1, and this can cause accumulating BLER and restrain for a long time less than desired value; And too much HARQ (Hybrid AutomaticRepeat reQuest; Mix automatic repeat requests) retransmit failure, cause that business can not satisfy the problem that user QoS (Quality of Service, service quality) requires.
Summary of the invention
The objective of the invention is to; A kind of method of Adaptive Modulation and Coding is provided; Can solve the problem that interval interior too small power dissipation that causes of BLER of BLER calibration statistics of the prior art and throughput descend, and the interval interior excessive problem that can not satisfy user's qos requirement that causes of BLER of BLER calibration statistics.
Another object of the present invention is to; A kind of device of Adaptive Modulation and Coding is provided; Can solve the problem that interval interior too small power dissipation that causes of BLER of BLER calibration statistics of the prior art and throughput descend, and the interval interior excessive problem that can not satisfy user's qos requirement that causes of BLER of BLER calibration statistics.
The method of Adaptive Modulation and Coding of the present invention; Comprise: obtain and to send professional CINR constantly; And table look-up and obtain MCS; And when definite MCS first adjustment amount, obtain MCS second adjustment amount, obtain MCS and said MCS first adjustment amount and MCS second adjustment amount then according to tabling look-up and confirm next scheduling final MCS of institute's sending service constantly.
Wherein, may further include the following step:
The relevant parameter of MCS first adjustment amount is set in advance, comprises: the tolerance band of BLER calibration statistic window, BLER, the initial value of MCS first adjustment amount and adjustment step-length.
Wherein, may further include the following step:
The relevant parameter of MCS second adjustment amount is set in advance, comprises: the MCS second adjustment amount computing cycle, the MCS second adjustment amount initial value and adjustment step-length.
Wherein, the adjustment step-length of said MCS second adjustment amount is divided into the rising step-length and reduces step-length;
Wherein, the rising step-length is meant: present case is judged as the adjusted value when needing rising MCS second adjustment amount, and this adjusted value is greater than zero; Reducing step-length is meant: present case is judged as the adjusted value when needing to reduce MCS second adjustment amount, and this adjusted value is greater than zero.
Wherein, said rising step-length is greater than 0 and less than 1 numerical value;
Said reduction step-length, confirm following formula accordingly according to the requirement of target BLER and the value of rising step-length:
Wherein, step2
DownAnd step2
UpBe respectively the reduction step-length and the rising step-length of second adjustment amount, BLER
TargetBe target BLER, K is the adjustment factor, and the span of K is 0.5～1,
Represent downward rounding operation.
Wherein, said MCS second adjustment amount that obtains comprises the following steps:
Judge that current scheduling constantly sends second adjustment amount that professional whether correct Solution transfers to upgrade MCS, if right demodulation, then basis is preset rising step-length rising MCS second adjustment amount on the basis of last scheduling MCS second adjustment amount constantly; Otherwise, on the basis of last scheduling MCS second adjustment amount constantly, reduce MCS second adjustment amount according to the preset step-length that reduces; Wherein, MCS second adjustment amount is an initial value 0.
Wherein, can also comprise the following steps:
In right demodulation, and when having set the computing cycle of MCS second adjustment amount, in computing cycle, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly added preset rising step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading;
In right demodulation, but when not setting the computing cycle of MCS second adjustment amount, then in the whole time of service dispatching, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly added preset rising step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading.
In addition, can also comprise the following steps:
Do not having right demodulation, and when having set the computing cycle of MCS second adjustment amount, then in computing cycle, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly deducted preset reduction step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading;
Do not having right demodulation, and when not setting the computing cycle of MCS second adjustment amount, then in the whole time of service dispatching, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly deducted preset reduction step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading.
Device of the present invention; Comprise: CINR acquiring unit, the MCS first adjustment amount acquiring unit, the MCS second adjustment amount acquiring unit, MCS computing unit, wherein, said CINR acquiring unit; Be used to obtain and send professional CINR constantly, and table look-up and obtain MCS; The said MCS first adjustment amount acquiring unit is used for confirming MCS first adjustment amount according to preset tolerance band and the interior BLER of calibration statistic window; The said MCS second adjustment amount acquiring unit is used for whether correct Solution transfers to calculate MCS second adjustment amount according to current scheduling moment institute's transmission business; Said MCS computing unit is used for obtaining MCS, first adjustment amount and second adjustment amount according to tabling look-up and confirms next scheduling final MCS of institute's sending service constantly.
Wherein, May further include parameter set unit, be used to be provided with the relevant parameter of MCS first adjustment amount and second adjustment amount, wherein; The relevant parameter of MCS first adjustment amount comprises: the tolerance band of BLER calibration statistic window, BLER, the initial value of MCS first adjustment amount and adjustment step-length; The relevant parameter of MCS second adjustment amount comprises: the MCS second adjustment amount computing cycle, the MCS second adjustment amount initial value and adjustment step-length.
The invention has the beneficial effects as follows: according to the method and the device of Adaptive Modulation and Coding of the present invention; Through introducing MCS second adjustment amount notion and the calculating; Realize Adaptive Modulation and Coding; Avoided the BLER in the calibration statistic window too small or excessive, solved when carrying out Adaptive Modulation and Coding the BLER too small power dissipation that causes of the calibration measurement period statistics that causes and the problem of throughput decline according to prior art; And when carrying out Adaptive Modulation and Coding according to prior art; The excessive feasible accumulation BLER of BLER of the calibration measurement period statistics that causes restrains less than desired value for a long time, and too much HARQ re-transmission failure, causes business can not satisfy the problem of user's qos requirement.
Description of drawings
Fig. 1 is the flow chart of method of the Adaptive Modulation and Coding of the embodiment of the invention;
Fig. 2 is the flow chart that obtains MCS second adjustment amount of the embodiment of the invention;
Fig. 3 is the structural representation of device of the Adaptive Modulation and Coding of the embodiment of the invention.
Embodiment
Below, with reference to the method and the device of accompanying drawing 1～3 detailed description Adaptive Modulation and Coding of the present invention.
As shown in Figure 1, the method for Adaptive Modulation and Coding of the present invention comprises the following steps:
Step 100: the relevant parameter that MCS first adjustment amount and second adjustment amount are set;
Step 200: obtain and to send professional CINR constantly, and table look-up and obtain MCS;
Step 300:, confirm MCS first adjustment amount according to preset tolerance band and the BLER that calibrates in the statistic window;
Step 400: obtain MCS second adjustment amount;
Step 500: obtain MCS, first adjustment amount and second adjustment amount according to tabling look-up and confirm next scheduling final MCS of institute's sending service constantly.
Particularly, in step 100, for MCS first adjustment amount: the setting of the relevant parameter of MCS first adjustment amount comprises the tolerance band of BLER calibration statistic window, BLER, the initial value of MCS first adjustment amount and the step-length of MCS adjustment.
In addition, the calibration statistic window of setting statistics BLER should be reasonable, need take into account the real-time and the stability of data.If statistic window is too big, then the adjustment of MCS is slower; If statistic window is too little, the BLER fluctuation that then comes out is very big, causes MCS to adjust repeatedly, influences the stability of system.
The selection of the tolerance band of BLER should be reasonable, first threshold value just of the prior art and second threshold value, if the tolerance band scope is too big, then the sensitivity meeting of adjustment reduces; If scope is too little, adopt new modulation coding mode after, BLER can corresponding increase or is reduced, and makes BLER fall easily outside the tolerance band, can cause MCS to adjust repeatedly, influences the stability of system.In addition, different business is different to the requirement of transmitted error rate, if as having or not sign indicating number to take place in the transmission of business such as real-time video, may cause video to pause, has a strong impact on user's impression; Even and the online class business of non real-time has a spot of nothing sign indicating number in transmission, and is also little to user's impression.Therefore, the selection of BLER tolerance band also will take into account the demands of different of different business to BLER.
In addition, can the MCS first adjustment amount initial value be set at zero.
The MCS adjustment step-length that MCS first adjustment amount relates to is divided into to be increased step-length and reduces step-length, all greater than 0, according to prior art, can all be set to 1.
In addition, in step 100, for MCS second adjustment amount: the setting of the relevant parameter of MCS second adjustment amount comprises the setting of the setting of the MCS second adjustment amount computing cycle, the MCS second adjustment amount initial value and the setting of adjustment step-length.
Wherein, second adjustment amount of MCS can be set a computing cycle parameter, and in each computing cycle, the initial value of first initialization MCS second adjustment amount upgrades MCS second adjustment amount according to step 400 then.This computing cycle can equal the calibration measurement period of BLER; Second adjustment amount of MCS is set-up and calculated cycle not also, i.e. the calculating of MCS second adjustment amount in the time of service dispatching, second adjustment amount that upgrades MCS according to the initial value and the step 400 of MCS second adjustment amount.
In addition, can the MCS second adjustment amount initial value be set at zero.
The adjustment step-length of MCS second adjustment amount is divided into the rising step-length and reduces step-length.Wherein, the rising step-length is meant that present case is judged as the adjusted value when needing rising MCS second adjustment amount, and this adjusted value is greater than zero; Reduce step-length and be meant that present case is judged as the adjusted value when needing to reduce MCS second adjustment amount, this adjusted value is greater than zero.As specific embodiment of the present invention, the rising step-length is greater than 0 and less than 1 numerical value, reduce step-length and then confirm accordingly according to the requirement of target BLER and the value of rising step-length, like formula (1):
Wherein, step2
DownAnd step2
UpBe respectively the reduction step-length and the rising step-length of second adjustment amount, BLER
TargetBe target BLER, K is the adjustment factor, and the span of K is 0.5～1,
Represent downward rounding operation.For example target BLER is 0.1, and K gets 0.8, then reduce step-length and be the rising step-length 8 times.
In addition, also need to confirm in advance the corresponding form of CINR and MCS.According to the regulation of LTE agreement, the up support of LTE is from MCS0～MCS28 totally 29 kinds of MCS, and corresponding different respectively modulation coding modes is as shown in table 1, is the correspondence table of CINR and MCS, and wherein, the unit of CINR is dB (decibel).
The correspondence table of table 1CINR and MCS
| MCS | CINR(dB) |
| 0 | -4.25 |
| 1 | -3.67 |
| 2 | -3.21 |
| 3 | -2.61 |
| 4 | -1.97 |
| 5 | -1.72 |
| 6 | -1.27 |
| 7 | -0.63 |
| 8 | 0.01 |
| 9 | 0.71 |
| 10 | 1.44 |
| 11 | 2.53 |
| 12 | 2.99 |
| 13 | 3.78 |
| 14 | 4.39 |
| 15 | 5.16 |
| 16 | 5.68 |
| 17 | 6.22 |
| 18 | 7.19 |
| 19 | 8.01 |
| 20 | 8.83 |
| 21 | 9.31 |
| 22 | 10.35 |
| 23 | 11.27 |
| 24 | 11.78 |
| 25 | 12.72 |
| 26 | 13.67 |
| 27 | 14.08 |
| 28 | 16.32 |
In addition, in step 200, comprise the following steps: to measure current scheduling CINR constantly, and the next scheduling of prediction CINR constantly, and the corresponding form of inquiring about predetermined CINR and MCS.
Wherein, can adopt existing method to measure current scheduling CINR constantly according to reverse link traffic channel or sounding channel.
Wherein, the next scheduling of prediction CINR constantly, the simplest method is: think next scheduling channel characteristics constantly and the current scheduling channel characteristics approximately equal in the moment, also can adopt comparatively complicated algorithm to predict according to channel characteristics.Can combine the situation of concrete channel, algorithm performance and implementation complexity to take all factors into consideration and selection.
In addition, CINR is predetermined with the corresponding form of MCS, tables look-up according to next one scheduling CINR predicted value constantly, obtains corresponding M CS.
In step 300, can utilize prior art to obtain MCS first adjustment amount.
As a specific embodiment of the present invention, step 300 mainly is to confirm MCS first adjustment amount according to the BLER in the preset BLER tolerance band calibration statistic window.Wherein, the MCS first adjustment amount initial value is zero.
When the BLER in the calibration statistic window is in tolerance band, directly adopt MCS first adjustment amount of MCS first adjustment amount of an adjustment cycle as this adjustment cycle.
When the BLER of calibration in the statistic window outside tolerance band, during less than first threshold value, then MCS first adjustment amount with a last adjustment cycle adds 1 MCS first adjustment amount as this adjustment cycle like the BLER in the calibration statistic window.
When the BLER of calibration in the statistic window outside tolerance band, during greater than second threshold value, then MCS first adjustment amount with a last adjustment cycle deducts 1 MCS first adjustment amount as this adjustment cycle like the BLER in the calibration statistic window.
In step 400, mainly whether correct Solution transfers to calculate MCS second adjustment amount according to current scheduling moment institute's transmission business.
If set the computing cycle of MCS second adjustment amount; Then the scheduling of first in computing cycle constantly; MCS second adjustment amount is an initial value 0; Since second scheduling constantly, just according to previous scheduling adjusted value constantly and current scheduling institute's transmission business transfer calculating and renewal MCS second adjustment amount of correct Solution whether constantly.
If do not set the computing cycle of MCS second adjustment amount; Then in the whole time of service dispatching, whether transfer to calculate and renewal MCS second adjustment amount by correct Solution according to the MCS second adjustment amount initial value, the adjusted value in the previous scheduling moment and current scheduling moment institute's transmission business for MCS second adjustment amount.
As shown in Figure 2, specifically comprise the following steps:
Judge that current scheduling constantly sends second adjustment amount that professional whether correct Solution transfers to upgrade MCS, if right demodulation, then basis is preset rising step-length rising MCS second adjustment amount on the basis of last scheduling MCS second adjustment amount constantly; Otherwise, on the basis of last scheduling MCS second adjustment amount constantly, reduce MCS second adjustment amount according to the preset step-length that reduces.
Wherein, when right demodulation, according to preset rising step-length rising MCS second adjustment amount, concrete shown in formula (2) on the basis of last scheduling MCS second adjustment amount constantly:
Δ
2(k)＝Δ
2(k-1)+step2
up (2)
Wherein, step2
UpBe the rising step-length of MCS second adjustment amount, Δ
2(k) k scheduling of expression MCS second adjustment amount constantly, Δ
2(1) initial value of expression MCS second adjustment amount can be made as 0.
Suppose that the initial value of MCS second adjustment amount is 0.
If right demodulation, and set the computing cycle of MCS second adjustment amount, then in computing cycle, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly added preset rising step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading.In next computing cycle, repeat this process again.
If right demodulation, but do not set the computing cycle of MCS second adjustment amount, then in the whole time of service dispatching, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly added preset rising step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading.
In addition, when not having right demodulation, on the basis of last scheduling MCS second adjustment amount constantly, reduce MCS second adjustment amount according to the preset step-length that reduces, concrete shown in formula (3):
Δ
2(k)＝Δ
2(k-1)-step2
down (3)
Wherein, step2
DownBe the reduction step-length of second adjustment amount, Δ
2(k) k scheduling of expression MCS second adjustment amount constantly, Δ
2(1) initial value of expression MCS second adjustment amount can be made as 0.
Suppose that the initial value of MCS second adjustment amount is 0.
If there is not right demodulation, and set the computing cycle of MCS second adjustment amount, then in computing cycle, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly deducted preset reduction step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading.In next computing cycle, repeat this process again.
If there is not right demodulation, and do not set the computing cycle of MCS second adjustment amount, then in the whole time of service dispatching, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly deducted preset reduction step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading.
In step 500; Comprise the following steps: MCS, MCS first adjustment amount and the summation of MCS second adjustment amount to obtaining according to tabling look-up; Carry out downward rounding operation then; High-order MCS and lowest-order MCS that the MCS that obtains behind the downward rounding operation and terminal can be supported compare respectively, confirm next scheduling final MCS of institute's sending service constantly.
Wherein, The method that obtains final MCS is: the smaller value among the high-order MCS that MCS that orientation obtains behind the rounding operation down and terminal can be supported; And, get higher value wherein, as final MCS to the lowest-order MCS that the smaller value that obtained and terminal can be supported.
Specific as follows:
1) if the high-order MCS that the MCS that obtains behind the rounding operation downwards surpasses that the terminal can support, the high-order MCS that then terminal can be supported is as the final MCS of transmission business moment institute's sending service.
2) if the high-order MCS that the MCS that obtains behind the rounding operation downwards is no more than that the terminal can support, then with the final MCS of the MCS that obtains behind the downward rounding operation as transmission business moment institute's sending service.
3) if the MCS that obtains behind the downward rounding operation surpasses the lowest-order MCS that the terminal can be supported, then with the final MCS of the MCS that obtains behind the downward rounding operation as institute's sending service of the professional moment of transmission.
4) if the MCS that obtains behind the rounding operation downwards is no more than the lowest-order MCS that the terminal can be supported, the lowest-order MCS that then terminal can be supported is as the final MCS of transmission business moment institute's sending service.
As shown in Figure 3, the device for Adaptive Modulation and Coding of the present invention comprises: parameter set unit, CINR acquiring unit, the MCS first adjustment amount acquiring unit, the MCS second adjustment amount acquiring unit, MCS computing unit.
Wherein, parameter set unit is used to be provided with the relevant parameter of MCS first adjustment amount and second adjustment amount.
For MCS first adjustment amount: the setting of the relevant parameter of MCS first adjustment amount comprises the tolerance band of BLER calibration statistic window, BLER, the initial value of MCS first adjustment amount and the step-length of MCS adjustment.
For MCS second adjustment amount: the setting of the relevant parameter of MCS second adjustment amount comprises the setting of the setting of the MCS second adjustment amount computing cycle, the MCS second adjustment amount initial value and the setting of adjustment step-length.Specifically with reference to the description in the said method.
The CINR acquiring unit is used to obtain and will sends professional CINR constantly, and tables look-up and obtain MCS;
The MCS first adjustment amount acquiring unit is used for confirming MCS first adjustment amount according to preset tolerance band and the interior BLER of calibration statistic window;
The MCS second adjustment amount acquiring unit is used for whether correct Solution transfers to calculate MCS second adjustment amount according to current scheduling moment institute's transmission business;
The MCS computing unit is used for obtaining MCS, first adjustment amount and second adjustment amount according to tabling look-up and confirms next scheduling final MCS of institute's sending service constantly.
More than the concrete function of each unit with reference to the description in the said method.
In sum; According to the method and the device of Adaptive Modulation and Coding of the present invention, according to the characteristics of LTE or WiMAX system, through introducing MCS second adjustment amount notion and the calculating; Realize Adaptive Modulation and Coding; Avoided the BLER in the calibration statistic window too small or excessive, solved when carrying out Adaptive Modulation and Coding the BLER too small power dissipation that causes of the calibration measurement period statistics that causes and the problem of throughput decline according to prior art; And when carrying out Adaptive Modulation and Coding according to prior art; The excessive feasible accumulation BLER of BLER of the calibration measurement period statistics that causes restrains less than desired value for a long time, and too much HARQ re-transmission failure, causes business can not satisfy the problem of user's qos requirement.
More than be in order to make those of ordinary skills understand the present invention; And to detailed description that the present invention carried out; But can expect; In the scope that does not break away from claim of the present invention and contained, can also make other variation and modification, these variations and revising all in protection scope of the present invention.
Claims (10)
1. the method for an Adaptive Modulation and Coding; It is characterized in that; Obtain and will send professional CINR constantly, and table look-up and obtain MCS, and when definite MCS first adjustment amount; Obtain MCS second adjustment amount, obtain MCS and said MCS first adjustment amount and MCS second adjustment amount then according to tabling look-up and confirm next scheduling final MCS of institute's sending service constantly.
2. the method for Adaptive Modulation and Coding as claimed in claim 1 is characterized in that, further comprises the following steps:
The relevant parameter of MCS first adjustment amount is set in advance, comprises: the tolerance band of BLER calibration statistic window, BLER, the initial value of MCS first adjustment amount and adjustment step-length.
3. the method for Adaptive Modulation and Coding as claimed in claim 1 is characterized in that, further comprises the following steps:
The relevant parameter of MCS second adjustment amount is set in advance, comprises: the MCS second adjustment amount computing cycle, the MCS second adjustment amount initial value and adjustment step-length.
4. the method for Adaptive Modulation and Coding as claimed in claim 3 is characterized in that, the adjustment step-length of said MCS second adjustment amount is divided into the rising step-length and reduces step-length;
Wherein, the rising step-length is meant: present case is judged as the adjusted value when needing rising MCS second adjustment amount, and this adjusted value is greater than zero; Reducing step-length is meant: present case is judged as the adjusted value when needing to reduce MCS second adjustment amount, and this adjusted value is greater than zero.
5. the method for Adaptive Modulation and Coding as claimed in claim 4 is characterized in that,
Said rising step-length is greater than 0 and less than 1 numerical value;
Said reduction step-length, confirm following formula accordingly according to the requirement of target BLER and the value of rising step-length:
Wherein, step2
DownAnd step2
UpBe respectively the reduction step-length and the rising step-length of second adjustment amount, BLER
TargetBe target BLER, K is the adjustment factor, and the span of K is 0.5～1,
Represent downward rounding operation.
6. the method for Adaptive Modulation and Coding as claimed in claim 1 is characterized in that, said MCS second adjustment amount that obtains comprises the following steps:
Judge that current scheduling constantly sends second adjustment amount that professional whether correct Solution transfers to upgrade MCS, if right demodulation, then basis is preset rising step-length rising MCS second adjustment amount on the basis of last scheduling MCS second adjustment amount constantly; Otherwise, on the basis of last scheduling MCS second adjustment amount constantly, reduce MCS second adjustment amount according to the preset step-length that reduces; Wherein, MCS second adjustment amount is an initial value 0.
7. the method for Adaptive Modulation and Coding as claimed in claim 6 is characterized in that, comprises the following steps:
In right demodulation, and when having set the computing cycle of MCS second adjustment amount, in computing cycle, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly added preset rising step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading;
In right demodulation, but when not setting the computing cycle of MCS second adjustment amount, then in the whole time of service dispatching, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly added preset rising step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading.
8. the method for Adaptive Modulation and Coding as claimed in claim 6 is characterized in that, comprises the following steps:
Do not having right demodulation, and when having set the computing cycle of MCS second adjustment amount, then in computing cycle, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly deducted preset reduction step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading;
Do not having right demodulation, and when not setting the computing cycle of MCS second adjustment amount, then in the whole time of service dispatching, first scheduling MCS second adjustment amount constantly is an initial value 0; Since second scheduling constantly, last scheduling MCS second adjustment amount is constantly deducted preset reduction step-length, obtain new MCS second adjustment amount, and as MCS second adjustment amount after upgrading.
9. carry out the device of method according to claim 1 for one kind, it is characterized in that, comprising: CINR acquiring unit, the MCS first adjustment amount acquiring unit, the MCS second adjustment amount acquiring unit, MCS computing unit, wherein,
Said CINR acquiring unit is used to obtain and will sends professional CINR constantly, and tables look-up and obtain MCS;
The said MCS first adjustment amount acquiring unit is used for confirming MCS first adjustment amount according to preset tolerance band and the interior BLER of calibration statistic window;
The said MCS second adjustment amount acquiring unit is used for whether correct Solution transfers to calculate MCS second adjustment amount according to current scheduling moment institute's transmission business;
Said MCS computing unit is used for obtaining MCS, first adjustment amount and second adjustment amount according to tabling look-up and confirms next scheduling final MCS of institute's sending service constantly.
10. device as claimed in claim 9 is characterized in that, further comprises parameter set unit, is used to be provided with the relevant parameter of MCS first adjustment amount and second adjustment amount, wherein,
The relevant parameter of MCS first adjustment amount comprises: the tolerance band of BLER calibration statistic window, BLER, the initial value of MCS first adjustment amount and adjustment step-length;
The relevant parameter of MCS second adjustment amount comprises: the MCS second adjustment amount computing cycle, the MCS second adjustment amount initial value and adjustment step-length.
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| CN2010102609054A CN102377513A (en) | 2010-08-24 | 2010-08-24 | Adaptive modulation and coding method and device |
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