CN103475442B - The method and apparatus of Adaptive Modulation and Coding AMC - Google Patents
The method and apparatus of Adaptive Modulation and Coding AMC Download PDFInfo
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Abstract
The present invention provides the method and apparatus of a kind of Adaptive Modulation and Coding AMC, modulate and coded system for adaptive change of channel status, the method is that the whole subframes to present channel are classified, corresponding different criteria for classification obtains the first subframe respectively, and described method includes: obtain coded system and the internal ring code check of AMC by measuring uplink signal-channel quality；The first outer shroud code check adjustment amount of described AMC is obtained by CRC check；Obtain the second outer shroud code check adjustment amount of described first subframe；And according to described coded system, described internal ring code check, described first outer shroud code check adjustment amount and described second outer shroud code check adjustment amount, described first subframe and the subframe identical with described first subframe classification are adjusted.Use technical scheme, carry out the adjustment of coded system for the single subframe that FER is high, thus improve the emitting performance of whole system.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of Adaptive Modulation and Coding (AMC, Adaptive
Modulation and Coding) method and apparatus.
Background technology
Third generation partnership projects (3GPP) Long Term Evolution (LTE) represents the major progress at cellular technology
And be as global system for mobile communications (GSM) and Universal Mobile Telecommunications System (UMTS) from
So the honeycomb 3G service of evolution is advanced next step.LTE provides up to 50 MBPSs (Mbps)
Uplink speed and the downlink speed of up to 100Mbps, and bring many for cellular network
Technical benefit.LTE be designed to meet in coming decade to high-speed data and media transmission with
And the bearer requirement that high power capacity voice is supported.Bandwidth can be stretched in the range of 1.25MHz to 20MHz,
This has catered to the demand of the heterogeneous networks operator with different bandwidth distribution, and allows also to carrier given
Bandwidth on more data and voice service are provided.LTE includes high-speed data, multimedia-on-demand and many matchmakers
Body broadcast service.
LTE physical layer (PHY) have employed the advanced technology that some are novel for cellular application.Among these
Transmit including OFDM (OFDM) and multiple-input and multiple-output (MIMO) data.It addition, LTE PHY
Downlink (DL) uses OFDM (OFDMA) and in up-link (UL) the single load of upper use
Ripple frequency division multiple access (SC-FDMA).
LTE can change according to the change of channel situation by using Adaptive Modulation and Coding (AMC) technology
Modified tone system, the pattern of code check.In the system using AMC technology, the user sat pretty, example
As high order modulation and high code check (such as 64QAM, bigger data block chi can be used close to the user of base station
Very little), and it is in the user of unfavorable position, its order of modulation of user and code check for example away from base station are then little
Some (such as QPSK, less block size).AMC technology is main so that base station can be the most sharp
Channel conditions can be automatically adapted to Radio Resource, UE.
The generally outer shroud in AMC scheme designs based on following, shown in Figure 1:
The channel quality of base station measurement up channel with this come the internal ring MCS that mapping pair answers (MCS,
Modulation and Coding Scheme, data transmission Modulation and Coding Scheme).Optimal with actual channel
Differing constant offset amount outer shroud △ MCS between MCSTarget, △ MCS is relevant to practical radio communication environment,
And it is unrelated with concrete measurement channel quality；Then △ MCS is initialized as 0, according to receive
△ MCS is dynamically adjusted by ACK/NACK, thus meets the constraint specifying FER.
Therefore, in prior art, communication system can take internal ring to add the method for outer shroud to determine that current wireless is believed
The modulation system of the transmission of road quality, and internal ring just comes from the base station system detection to quality of wireless channel,
And outer shroud comes from FER, and (i.e. setting the FER 10% of a target, once FER is higher than this door
Limit, then corresponding modulation system will reduce, to reduce the existence of frame by mistake).
From the point of view of above-mentioned algorithm, based on a basic premise, that is the transmission situation of all wireless sub-frames
As substantially.But, there are some special situations, i.e. due to the performance of UE self, (or due to
Base station side is poor for the subframe demodulation performance under certain particular arrangement) believe with periodic report multiplexing at some
The when of breath, corresponding subframe will be compared other subframe performance and change.Such as, 10 sons altogether
Frame, the when that each 1ms, each UE sending information, it is assumed that always demodulate unsuccessfully at 2 work song frames,
I.e. 2 work song frame FERs are 100%, and other subframes do not have mistake, are 0%.So in this feelings
Under condition, the average FER of 10 subframes is 10%, meets the threshold requirement set.Now, once its
Its subframe has mistake frame somewhat again, then the overall performance of all subframes all can decline.It addition, sometimes
It not multiplexed information but the more special existing way of subframe.When dispatching the most continuously, UE better performances；
During discontinuously dispatching, UE poor-performing.So the performance of UE and the distance dependent system apart from base station, so
The overall performance of system will be affected.
Accordingly, if it is desired to improve the overall performance of system, outer shroud is added only with traditional internal ring
Method is the problem that can not solve to improve systematic entirety energy, and for this problem, the most not yet proposes effectively
Solution.
Summary of the invention
It is an object of the invention to provide the method and apparatus of a kind of Adaptive Modulation and Coding, be used for solving existing skill
It is the problem that can not solve to improve systematic entirety energy that internal ring traditional in art adds the method for outer shroud.
For achieving the above object, according to an aspect of the present invention, it is provided that the side of a kind of Adaptive Modulation and Coding
Method, and by the following technical solutions:
The method of Adaptive Modulation and Coding AMC, the method is that the whole subframes to present channel are classified,
Corresponding different criteria for classification obtains the first subframe respectively, and described method includes: by measuring up channel matter
Amount obtains coded system and the internal ring code check of AMC；Obtained by CRC check outside the first of described AMC
Ring code check adjustment amount；Obtain the second outer shroud code check adjustment amount of described first subframe；And according to described coding
Mode, described internal ring code check, described first outer shroud code check adjustment amount and described second outer shroud code check adjustment amount
Described first subframe and the subframe identical with described first subframe classification are adjusted.
Further, the acquisition methods of described first subframe comprises determining that the first classification of described whole subframe
Described whole subframes are classified by standard；Set the mistake frame tolerance of corresponding described first criteria for classification；
Obtaining FER beyond the described subframe missing frame tolerance is described first subframe.
Further, described frame tolerance by mistake is: the described subframe of classification under described first criteria for classification
The maximum threshold that allowed of the target frame error rate of FER and system.
Further, described acquisition FER is described first subframe beyond the subframe of described frame tolerance by mistake
Including: the whole subframes under described first criteria for classification are carried out respectively the FER statistics in time window, obtains
Take the FER of described whole subframe；Described FER is compared with described frame tolerance by mistake, and
One comparative result；Obtain the described FER described first subframe beyond described frame tolerance by mistake.
Further, the described mistake whole subframes under described first criteria for classification carried out respectively in time window
Frame per second is added up, and the FER obtaining described whole subframe includes: the described subframe in acquisition predetermined amount of time
FER.
According to another aspect of the present invention, it is provided that the device of a kind of Adaptive Modulation and Coding AMC, and
By the following technical solutions:
The device of Adaptive Modulation and Coding AMC, this device is that the whole subframes to present channel are classified,
Corresponding different criteria for classification obtains the first subframe respectively, and described device includes: the first acquisition module, is used for
Coded system and the internal ring code check of AMC is obtained by measuring uplink signal-channel quality；Second acquisition module, uses
In the first outer shroud code check adjustment amount being obtained described AMC by CRC check；3rd acquisition module, uses
In the second outer shroud code check adjustment amount obtaining described first subframe；And adjusting module, for according to described volume
Code mode, described internal ring code check, described first outer shroud code check adjustment amount and described second outer shroud code check adjust
Described first subframe and the subframe identical with described first subframe classification are adjusted by amount.
Further, the device of Adaptive Modulation and Coding AMC also includes: sort module, is used for determining institute
State the first criteria for classification of whole subframe, described whole subframes are classified；Setting module, is used for setting
The mistake frame tolerance of corresponding described first criteria for classification；4th acquisition module, is used for obtaining FER and exceeds
The subframe of described frame tolerance by mistake is described first subframe.
Further, described 4th acquisition module includes: statistical module, for described first criteria for classification
Under whole subframes carry out respectively in time window FER statistics, obtain the FER of described whole subframe；
Comparison module, for being compared with described frame tolerance by mistake by described FER, and obtains a comparative result；
4th obtains submodule, for obtaining the described FER described first subframe beyond described frame tolerance by mistake.
Use technical scheme, according to different criteria for classifications, can be for the high subframe of FER
Individually adjust, thus improve the performance of whole system, therefore under particular case occurs, the present invention's
Technical scheme has prominent technique effect such as:
1. when certain terminal due to sounding function support inadequate when, it is likely that can cause
Occur that demodulation performance is very poor in subframe before and after sounding, the modulation system of above-mentioned subframe be adjusted,
This problem can be solved, and improve the performance of whole system.
2. the transmitter of certain terminal is under dormancy situation, it is impossible to heighten transmitting power in time to the door specified
At limit, then can occur that at corresponding subframe, demodulation performance is very poor, is carried out the modulation system of above-mentioned subframe equally
Adjust, then can solve this problem.
In addition to objects, features and advantages described above, the present invention also has other purpose, feature
And advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
Accompanying drawing is used for providing a further understanding of the present invention, constitutes the part of the application, and the present invention shows
Meaning property embodiment and explanation thereof are used for explaining the present invention, are not intended that inappropriate limitation of the present invention.At accompanying drawing
In:
Fig. 1 represents the schematic flow sheet of the AMC method of adjustment described in background of invention；
Fig. 2 represents the method flow diagram of the Adaptive Modulation and Coding described in the embodiment of the present invention；
Fig. 3 represents the method flow diagram of the Adaptive Modulation and Coding described in further embodiment of this invention；
Fig. 4 represents the structural representation of the device of the Adaptive Modulation and Coding described in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the present invention can be wanted by right
The multitude of different ways limited and cover is asked to implement.
Fig. 2 represents the method flow diagram of the Adaptive Modulation and Coding described in the embodiment of the present invention.
Shown in Figure 2, the method for Adaptive Modulation and Coding AMC includes:
S101: obtain coded system and the internal ring code check of AMC by measuring uplink signal-channel quality；
S103: obtained the first outer shroud code check adjustment amount of described AMC by CRC check；
S105: obtain the second outer shroud code check adjustment amount of described first subframe；And
S107: according to described coded system, described internal ring code check, described first outer shroud code check adjustment amount and
Described second outer shroud code check adjustment amount is to described first subframe and the son identical with described first subframe classification
Frame is adjusted.
The technique scheme implemented by this, adds the method for outer shroud to present channel not only by internal ring
Subframe be adjusted, it is also possible to according to classification, FER is exceeded the gate that this classification subframe is allowed
The subframe of limit value individually adjusts, and so can be greatly improved the overall performance of system.
In the technique scheme of the present embodiment, step S101 is by business procedure, depends on respectively
The internal ring coded system of the AMC got according to PUSCH channel measurement situation and internal ring code check α；Step
S103 also in business procedure, gets respectively in accordance with the mistake frame condition of all subframes of PUSCH
The coded system of AMC outer shroud and code check adjustment amount Δ MCS.
For step S105, according to different rules, the channel of PUSCH can be demodulated FER classification,
Could also say that and subframe is classified, such as, with terminal, sounding function is supported not as standard,
Subframe is divided into M1, M2 ..., MN, and obtains M1, M2 ..., mistake frame corresponding for MN
Rate is: Bler1, Bler2 ..., BlerN (N is equal to FER classification number).
Difference is taken with target frame error rate BLERTarget respectively with the above-mentioned different classes of FER got.
If difference more than thresholding DiffBLER, then choose the outer shroud code check of corresponding subframe adjust amplitude δ i 0 <
(i) < N+1).
Classifying for another, by above-mentioned calculating, the outer shroud code check that can obtain corresponding subframe adjusts width
Degree δ j ... (0 < (j) < N+1).
Final according to described coded system, described internal ring code check, described first outer shroud code check adjustment amount and root
Carry out according to the described second outer shroud code check adjustment amount subframe to the first subframe and with the first subframe identical category
Adjust.
For the above-mentioned criteria for classification of the present embodiment, this criteria for classification is the most just based on base station side can
The configuration state of the subframe to know.For example: every 10 subframes are configured with the SRS of 1 subframe
Subframe, then be considered as according to SRS with or without can serve as a criteria for classification.Every 10
Sub-frame configuration has the SRS blank configuration of 3 to 5 subframes, then just can have not according to subframe
There is SRS BLANk as a criteria for classification.Again such as, UE discontinuously dispatching when, send out
Machine of penetrating processes abnormal.And all subframes just can be divided into scheduling and discontinuous dispatching continuously, as subframe
Criteria for classification.Why sort out according to sorting technique above, be because in test process, find UE
Processing SRS place subframe or discontinuous dispatching when, performance own can decline.So introducing
Such criteria for classification.
Preferably, the acquisition methods of the first subframe comprises determining that the first criteria for classification of described whole subframe,
Described whole subframes are classified；Set the mistake frame tolerance of corresponding described first criteria for classification；Obtain
FER is described first subframe beyond the subframe of described frame tolerance by mistake.
The technique scheme implemented by this, whole according to set that by mistake frame tolerance comes from whole channel
Subframe obtains the first subframe needing to adjust, thus realizes this subframe is individually adjusted.
In the technique scheme of the present embodiment, determine the criteria for classification of subframe, such as, determine terminal pair
The when that sounding function being supported inadequate, being a criteria for classification, the subframe classification increasing the control of new outer shroud is
X1、X2…XN.In LTE system is run, it is found that PUSCH can be by the various performances of UE
Impact.Before and after the transmission of PUSCH, power the most drastically lifting or decline, and this would generally affect
The stablizing of power sent to PUSCH, and then affect the FER of PUSCH, also can also choose other
Sorting technique, does not do unnecessary elaboration at this.
Set corresponding criteria for classification X1, X2 ... the subframe of XN is tolerated the target frame error rate with system
Mistake frame tolerance DiffBLER of BLERTarget.By arranging this scope, judge when meeting with this
The when of criteria for classification, if exceeding this thresholding, then individually the subframe meeting criteria for classification is carried out new outside
Ring adjusts.
Preferably, described the first subframe that FER exceeds described frame tolerance by mistake carries out outer shroud code check tune
Whole, and obtain described first subframe outer shroud code check adjust amplitude include: under described first criteria for classification
Described subframe carries out the FER statistics in time window respectively, obtains the FER of described subframe；By described mistake
Frame per second compares with described frame tolerance by mistake, and obtains a comparative result；Obtain described FER beyond institute
State described first subframe of frame tolerance by mistake, and the outer shroud code check obtaining described first subframe adjusts amplitude.
The technique scheme of the present embodiment, gives the yet another aspect obtaining the first subframe, by subframe
Carry out the FER statistics in time window, this FER compared with the mistake frame tolerance set,
To find out beyond the subframe presetting frame tolerance by mistake, and less than this, frame tolerance by mistake is preset for FER
The subframe of scope does not the most do individual processing, the most both can save adjustresources, can also improve simultaneously
The overall performance of system.
In the technique scheme of the present embodiment, can be in business procedure, to different criteria for classifications
X1, X2 ... XN carries out the FER statistics in time window respectively.Refer in time window, arrange predetermined
Time period is as a time window, the concrete subframe FER added up in this time period.If different classification
FER differs with the target frame error rate of system greater than DiffBLER, then carry out new outer shroud adjustment, adjusts width
Degree is δ i.
Fig. 3 represents the method flow diagram of the Adaptive Modulation and Coding described in further embodiment of this invention.
Shown in Figure 3, the method for Adaptive Modulation and Coding includes:
Step 30: base station measurement uplink signal-channel quality；
Step 301: obtain internal ring coded system and code check α according to the measurement result of step 30；
Step 32: base station carries out CRC(CRC, Cyclic Redundancy Check, cyclic redundancy school
Test code) verification；
Step 321: obtain coded system and outer shroud code check adjustment amount according to the CRC check result of step 32
△MCS；
Step 320: subframe is classified according to method set in advance: Y1, Y2 ... YN；
Step 322: obtain difference classification under a period of time in above-mentioned subframe FER Bler1,
Bler2…BlerN;
Or, the FER of execution acquisition difference classification: Bler1, Bler2 ... BlerN;
Step 326: obtaining all this period meets BlerX-BlerTarget > (X is 1 to N to DiffBLER
Natural number) this classification subframe, and obtain the adjustment amplitude δ i that this subframe is corresponding.
The technique scheme of the present embodiment gives the concrete Adjusted Option of present channel, from macroscopic view and adjustment
Individually adjust two angles with local present channel is adjusted, thus overcome the limitation of prior art
Property, the problem affecting systematic function that the special circumstances that simultaneously system can also be overcome to occur are brought, such as
When money terminal due to sounding function support inadequate when, it is likely that can cause before sounding
After subframe on occur that demodulation performance is very poor, the modulation system of above-mentioned subframe is adjusted, can be solved this
Problem, and improve the performance of whole system.Or at the transmitter of terminal under dormancy situation, it is impossible to
Heighten transmitting power in time at the thresholding specified, then can occur that at corresponding subframe, demodulation performance is very poor, together
The modulation system of above-mentioned subframe is adjusted by sample, then can solve this problem.The above-mentioned skill implemented by this
Art scheme, can carry out outer shroud code check adjustment, thus improve the overall performance of system single subframe, such as,
For certain criteria for classification, one has 10 subframes, the when that each 1ms, each UE sending information,
Assuming always to demodulate unsuccessfully at 2 work song frames, i.e. 2 work song frame FERs are 100%, and other subframes do not have
Mistake, is 0%.The most in this case, the average FER of 10 subframes is 10%, meets
The threshold requirement set.Now, once other subframe has mistake frame somewhat again, then the entirety of all subframes
Performance all can decline.After using the technique scheme of the present invention, adjust for the first time all subframes are carried out
After, individually carrying out for 2 work song frames declining modulation system, then 2 work song frames can control to 10%, and its
Its subframe still can send to use maximum modulation mode.Thus improve the performance of system.
Fig. 4 represents the structural representation of the device of the Adaptive Modulation and Coding described in the embodiment of the present invention.
Shown in Figure 4, the device of Adaptive Modulation and Coding AMC, this device is complete to present channel
Portion's subframe is classified, and corresponding different criteria for classification obtains the first subframe respectively, and described device includes: the
One acquisition module 40, for obtaining coded system and the internal ring code check of AMC by measuring uplink signal-channel quality；
Second acquisition module 42, for obtaining the first outer shroud code check adjustment amount of described AMC by CRC check；
3rd acquisition module 44, for obtaining the second outer shroud code check adjustment amount of described first subframe；And adjust
Module 46, for according to described coded system, described internal ring code check, described first outer shroud code check adjustment amount
And described second outer shroud code check adjustment amount is to described first subframe and identical with described first subframe classification
Subframe be adjusted.
Alternatively, the device of Adaptive Modulation and Coding AMC also includes: sort module (not shown),
For determining the first criteria for classification of described whole subframe, described whole subframes are classified；Setting module,
For setting the mistake frame tolerance of corresponding described first criteria for classification；4th acquisition module (not shown),
It is described first subframe for obtaining FER beyond the described subframe missing frame tolerance.
Alternatively, described 4th acquisition module includes: statistical module (not shown), for described the
Whole subframes under one criteria for classification carry out the FER statistics in time window respectively, obtain described whole subframe
FER；Comparison module (not shown), for entering described FER with described frame tolerance by mistake
Row compares, and obtains a comparative result；4th obtains submodule (not shown), is used for obtaining described frame by mistake
Rate is beyond described first subframe of described frame tolerance by mistake.It is therefore found that, use the skill of the present invention
Art scheme, according to different criteria for classifications, individually can adjust for the subframe that FER is high, thus
Improve the performance of whole system.
Use technical scheme, according to different criteria for classifications, on the basis of carrying out macro readjustment of direction,
Can individually adjust for the subframe that FER is high, thus improve the performance of whole system.
Claims (8)
1. the method for an Adaptive Modulation and Coding AMC, it is characterised in that the method is to present channel
Whole subframes classify, corresponding different criteria for classification obtains the first subframe respectively, and described method includes:
Coded system and the internal ring code check of AMC is obtained by measuring uplink signal-channel quality；
The first outer shroud code check adjustment amount of described AMC is obtained by CRC check；
Obtain the second outer shroud code check adjustment amount of described first subframe；And
According to described coded system, described internal ring code check, described first outer shroud code check adjustment amount and described
Described first subframe and the subframe identical with described first subframe classification are carried out by two outer shroud code check adjustment amounts
Adjust.
2. the method for Adaptive Modulation and Coding AMC as claimed in claim 1, it is characterised in that described
The acquisition methods of the first subframe includes:
Determine the first criteria for classification of described whole subframe, described whole subframes are classified；
Set the mistake frame tolerance of corresponding described first criteria for classification；
Obtaining FER beyond the described subframe missing frame tolerance is described first subframe.
3. the method for Adaptive Modulation and Coding AMC as claimed in claim 2, it is characterised in that described
Frame tolerance is by mistake:
The FER of the described subframe classified under described first criteria for classification and the target frame error rate institute of system
The maximum threshold allowed.
4. the method for Adaptive Modulation and Coding AMC as claimed in claim 2, it is characterised in that described
Obtaining FER beyond the described subframe missing frame tolerance is that described first subframe includes:
Whole subframes under described first criteria for classification are carried out respectively the FER statistics in time window, obtains
The FER of described whole subframe；
Described FER is compared with described frame tolerance by mistake, and obtains a comparative result；
Obtain the described FER described first subframe beyond described frame tolerance by mistake.
5. the method for Adaptive Modulation and Coding AMC as claimed in claim 4, it is characterised in that described
Whole subframes under described first criteria for classification are carried out respectively the FER statistics in time window, obtains described
All the FER of subframe includes:
The FER of the described subframe in acquisition predetermined amount of time.
6. the device of an Adaptive Modulation and Coding AMC, it is characterised in that this device is to present channel
Whole subframes classify, corresponding different criteria for classification obtains the first subframe respectively, and described device includes:
First acquisition module, for obtaining coded system and the internal ring of AMC by measuring uplink signal-channel quality
Code check；
Second acquisition module, is adjusted for being obtained the first outer shroud code check of described AMC by CRC check
Amount；
3rd acquisition module, for obtaining the second outer shroud code check adjustment amount of described first subframe；And
Adjusting module, for adjusting according to described coded system, described internal ring code check, described first outer shroud code check
Whole amount and described second outer shroud code check adjustment amount to described first subframe and with described first subframe classification
Identical subframe is adjusted.
7. the device of Adaptive Modulation and Coding AMC as claimed in claim 6, it is characterised in that also wrap
Include:
Described whole subframes, for determining the first criteria for classification of described whole subframe, are carried out by sort module
Classification；
Setting module, for setting the mistake frame tolerance of corresponding described first criteria for classification；
4th acquisition module, is described first for obtaining FER beyond the described subframe missing frame tolerance
Subframe.
8. the device of Adaptive Modulation and Coding AMC as claimed in claim 7, it is characterised in that described
4th acquisition module includes:
Statistical module, for carrying out the mistake in time window respectively to the whole subframes under described first criteria for classification
Frame per second is added up, and obtains the FER of described whole subframe；
Comparison module, for being compared with described by mistake frame tolerance by described FER, and must one compare
Result；
4th obtains submodule, for obtaining described FER beyond described the first of described frame tolerance by mistake
Subframe.
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| CN101669382A (en) * | 2007-03-01 | 2010-03-10 | 株式会社Ntt都科摩 | Base station device and communication control method |
| CN101964691A (en) * | 2009-07-24 | 2011-02-02 | 大唐移动通信设备有限公司 | AMC adjustment method and device |
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| CN101669382A (en) * | 2007-03-01 | 2010-03-10 | 株式会社Ntt都科摩 | Base station device and communication control method |
| CN101964691A (en) * | 2009-07-24 | 2011-02-02 | 大唐移动通信设备有限公司 | AMC adjustment method and device |
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