CN104426628A - Threshold adjusting method and system of modulation coding mode - Google Patents
Threshold adjusting method and system of modulation coding mode Download PDFInfo
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- CN104426628A CN104426628A CN201310382376.9A CN201310382376A CN104426628A CN 104426628 A CN104426628 A CN 104426628A CN 201310382376 A CN201310382376 A CN 201310382376A CN 104426628 A CN104426628 A CN 104426628A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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Abstract
The invention relates to a threshold adjusting method and system of a modulation coding mode. The method comprises the following steps: obtaining multiple samples, wherein the samples are about feedback information of transmission at a time, the modulation coding mode employed by the transmission corresponding to the feedback information in the (i+2)th sample is MCSi, and the modulation coding mode employed by the transmission corresponding to the feedback information in the first sample is MCS0; determining whether to adjust the threshold of the modulation coding mode MCSi be referring to the (i+1)th sample and the (i+2)th sample, and when it is determined that downward adjusting is needed, adjusting the threshold downwards; when it is determined that upward adjusting is needed, adjusting the threshold upwards; and when it is determined that adjusting is unnecessary, maintaining the threshold unchanged, wherein i is an integer greater than or equal to zero.
Description
Technical field
The present invention relates to wireless communication technology field, be specifically related to a kind of threshold adjustment methods and system of modulation coding mode.
Background technology
In mobile communication system, along with the demand of high speed data transmission service constantly increases, base station, in order to transmit ascending data faster and more accurately, needs to select up modulation coding mode (MCS) adaptively.The transmission performance of MCS is different along with the difference of Signal to Interference plus Noise Ratio (SINR).Existing communication system often using the Block Error Rate of 10% for criterion chooses the threshold value of corresponding SINR as MCS.Base station measures the reception SINR of up channel in real time, the MCS that selected threshold is mated with present channel quality.
Usually, base station provides MCS-SINR mapping table under specific channel model in advance by link level simulation, often kind of MCS corresponds to specific objective Block Error Rate (such as, 10%) the SINR threshold value under, but different location, not in the same time, also different to the demand of MCS demodulation ability under different fading environment and multi-path environment, changeless threshold value cannot the change of adaptive channel environment.
Thus, CN200410065847.4 proposes a kind of MCS system of selection, the method measures SINR in real time, for the SINR dropped in given range, according to cyclic redundancy check (CRC) (CRC) correctness of transmission packet, lowering by step-length or raise the threshold value of the MCS preset, is the channel circumstance of Adaptive change, raises step-length real-time variable.But the method is when carrying out the adjusting thresholds of MCS at every turn, by unified for threshold value corresponding for all rank MCS adjustment, and the adjustment of the threshold value of MCS can not be carried out for the decoded result of each transmission.But the transmission performance that every rank MCS is corresponding is different, therefore, the dynamic conditioning of the threshold value of this MCS can not the change of adaptive channel environment well.
Summary of the invention
Technical problem to be solved by this invention is that the dynamic conditioning of the threshold value of MCS can not the change of adaptive channel environment well.
For this purpose, the present invention proposes a kind of threshold adjustment methods of modulation coding mode, comprising: obtain multiple sample, described sample is the feedback information once transmitted, wherein, the modulation coding mode that the transmission that the feedback information in the i-th+2 samples is corresponding adopts is MCS
i, and the modulation coding mode that transmission corresponding to feedback information in first sample adopts is MCS
0; Judge whether to need modulation coding mode MCS with reference to the i-th+1 sample and the i-th+2 samples
ithreshold value adjust, when judgement need lower timing, lower described threshold value; When judgement needs upper timing, raise described threshold value; When judging without the need to adjusting, described threshold value remains unchanged, wherein, i be more than or equal to 0 integer.
Preferably, the multiple sample of described acquisition comprises: drop on different threshold intervals according to the Signal to Interference plus Noise Ratio recorded and transmit the modulation coding mode that adopts and divide sample space.
Preferably, described Signal to Interference plus Noise Ratio is instantaneous Signal to Interference plus Noise Ratio.
Preferably, described reference the i-th+1 sample and the i-th+2 samples judge whether to need modulation coding mode MCS
ithreshold value carry out adjustment and comprise: when detecting that the Block Error Rate of the i-th+1 sample is lower, lower modulation coding mode MCS
ithreshold value; When detecting that the Block Error Rate of the i-th+2 samples is higher, raise modulation coding mode MCS
ithreshold value; When detecting that the Block Error Rate of the i-th+1 sample and the i-th+2 samples is moderate, modulation coding mode MCS
ithreshold value remain unchanged, wherein i be more than or equal to 0 integer.
The invention also discloses a kind of adjusting thresholds system of modulation coding mode, comprise: sample collection module, for obtaining multiple sample, described sample is the feedback information once transmitted, wherein, the modulation coding mode that the transmission that the feedback information in the i-th+2 samples is corresponding adopts is MCS
i, and the modulation coding mode that transmission corresponding to feedback information in first sample adopts is MCS
0; Judge module, for judging whether to need modulation coding mode MCS with reference to the i-th+1 sample and the i-th+2 samples
ithreshold value adjust; And threshold adjustment module, when described judge module judges to need lower timing, lower described threshold value; When described judge module judges to need upper timing, raise described threshold value; When described judge module judges without the need to adjusting, described threshold value remains unchanged, wherein, i be more than or equal to 0 integer.
Preferably, described sample collection module drops on different threshold intervals according to the Signal to Interference plus Noise Ratio recorded and divides sample space with the modulation coding mode adopted.
Preferably, described Signal to Interference plus Noise Ratio is instantaneous Signal to Interference plus Noise Ratio.
Preferably, described judge module, when detecting that the Block Error Rate of the i-th+1 sample is lower, judges to lower modulation coding mode MCS
ithreshold value; When detecting that the Block Error Rate of the i-th+2 samples is higher, judge to raise modulation coding mode MCS
ithreshold value; When detecting that the Block Error Rate of the i-th+1 sample and the i-th+2 samples is moderate, judge modulation coding mode MCS
ithreshold value remain unchanged, wherein i be more than or equal to 0 integer.
By employing according to the method for adjustment of the threshold value of the MCS of the embodiment of the present invention and system, dynamic adjusting thresholds is carried out independently for each rank MCS, the MCS-SINR mapping table on revised theory can be carried out better according to actual scene, thus the speed of the business of guarantee and error block rate requirement, and adopt instantaneous value to carry out the screening of sample according to the threshold adjustment methods of the MCS of the embodiment of the present invention and system, make the selection of sample meticulousr, more can reflect the channel circumstance in each moment, farthest avoid overshoot.
Accompanying drawing explanation
Can understanding the features and advantages of the present invention clearly by reference to accompanying drawing, accompanying drawing is schematic and be not understood to carry out any restriction to the present invention, in the accompanying drawings:
Fig. 1 shows the flow chart of the threshold adjustment methods of the MCS according to the embodiment of the present invention;
Fig. 2 shows the schematic diagram of the adjusting thresholds system of the MCS according to the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
Fig. 1 shows the flow chart of the MCS threshold adjustment methods according to the embodiment of the present invention.As shown in Figure 1, the method comprises:
Step S1: obtain multiple sample;
Step S2: reference sample judges whether to need the threshold value to MCS to adjust, when judgement needs upper timing, enters into step S3; When judgement needs lower timing, enter into step S4; When judging without the need to adjusting, enter into step S5.
Step S3: raise this threshold value;
Step S4: lower this threshold value;
Step S5: threshold value remains unchanged.
Wherein, i be more than or equal to 0 integer.
Below each above-mentioned step is described in detail.
For step S1, assuming that there is M rank MCS, be respectively MCS
0, MCS
1, MCS
2mCS
m-1, and threshold value corresponding to each rank MCS is respectively Th
0, Th
1, Th
2th
m-1.SINR is the instantaneous Signal to Interference plus Noise Ratio that system is measured in real time, and compared with smooth value, the excursion of instantaneous value is larger, is defined, the selection of sample can be made meticulousr, more can reflect channel circumstance sometime by this value to range of the sample.By such sample, carry out the adjustment of judgment threshold, the adjustment of threshold value can be allowed more careful, farthest avoid the problem of toning.When SINR drops on different threshold interval time, the selection situation of MCS is respectively:
Work as SINR<Th
1time, select MCS=MCS
0;
Work as Th
1≤ SINR<Th
2time, select MCS=MCS
1;
…
Work as Th
m-1during≤SINR, select MCS=MCS
m-1.
The sample of thresholding algorithm definition is distinguished the exponent number of MCS and is carried out, sample storage be feedback information (that is, ACK/NACK information) sometime, and instantaneous Signal to Interference plus Noise Ratio corresponding to these moment is SINR.Be the situation of M for MCS exponent number, total following M+1 kind sample, corresponding certain of the ACK/NACK information in these samples transmits MCS and SINR adopted and has following feature respectively:
Sample 1:MCS=MCS
0and SINR<Th
0;
Sample 2:MCS=MCS
0and Th
0≤ SINR<Th
1;
Sample 3:MCS=MCS
1and Th
1≤ SINR<Th
2;
…
Sample M+1:MCS=MCS
m-1and Th
m-1≤ SINR.
For uplink each time, transmit according to this time the threshold interval that MCS and SINR that adopt fall into, judge that this time is transmitted the ACK/NACK information fed back and belonged to which sample interval above-mentioned, and by ACK/NACK information stored in corresponding sample interval.
It should be noted that, the modulation coding mode of sample 1 and sample 2 is all chosen as MCS
0, why be divided into again two samples, mainly consider to ensure MCS
0threshold value have the passage of downward, this is also the main cause arranging sample 1.
In step S2 to S5, the threshold value of each rank MCS is adjusted, specific as follows:
Judge whether to need to adjust MCS by detecting Block Error Rate
ithreshold value.Particularly, when detecting that the Block Error Rate of the i-th+1 sample is lower, lower MCS
ithreshold value; When detecting that the Block Error Rate of the i-th+2 samples is higher, raise MCS
ithreshold value; When detecting that the Block Error Rate of the i-th+1 sample and i+2 sample is moderate, MCS
ithreshold value remain unchanged, wherein i be more than or equal to 0 integer.
When Block Error Rate is lower than certain value A, can think that Block Error Rate is lower, when Block Error Rate is higher than certain value B, can think that Block Error Rate is higher, when Block Error Rate is between A and B, can think that Block Error Rate is moderate.The concrete value of A with B is relevant with concrete traffic performance, and scope is between 0-15%.Such as, when the business transmitted is video traffic, the usual value of A is the usual value of 3%, B is 5%; When the business transmitted is data transmission service, the usual value of A is the usual value of 6%, B is 10%.The algorithm raising or lower threshold value belongs to existing in prior art, and those skilled in the art according to actual conditions, and can select suitable algorithm to raise or lower threshold value.
For example, for MCS
0threshold value Th
0adjustment as follows: find that the Block Error Rate of sample 1 lower needs lowers MCS when detecting
0threshold value Th
0time, by threshold value Th
0be lowered to certain value; Find that the Block Error Rate of sample 2 higher needs raises MCS when detecting
0threshold value Th
0time, then by threshold value Th
0on be transferred to certain value; When the Block Error Rate detecting discovery sample 1 and sample 2 is moderate, then without the need to adjusting threshold value.
Same reason, for MCS
ithreshold value Th
iadjustment as follows: find that the Block Error Rate of sample i+1 lower needs lowers MCS when detecting
ithreshold value Th
itime, by threshold value Th
ibe lowered to certain value; Find that the Block Error Rate of sample i+2 higher needs raises MCS when detecting
ithreshold value Th
itime, by threshold value Th
ion be transferred to certain value; When detect find that the Block Error Rate of sample i+1 and sample i+2 is moderate time, then without the need to adjusting threshold value, wherein i be more than or equal to 0 integer.
For MCS
m-1threshold value Th
m-1, find that the Block Error Rate of sample M lower needs lowers MCS when detecting
m-1threshold value Th
m-1time, by threshold value Th
m-1be lowered to certain value; Find that the Block Error Rate of reference sample M+1 higher needs raises MCS when detecting
m-1threshold value Th
m-1time, by threshold value Th
m-1on be transferred to certain value; When the Block Error Rate detecting discovery sample M and sample M+1 is moderate, then without the need to adjusting threshold value.
Thus, the adjusting thresholds of each rank MCS is completed.
Fig. 2 shows the schematic diagram of the MCS adjusting thresholds system according to the embodiment of the present invention.As shown in Figure 2, this system comprises:
Sample collection module 201, for obtaining multiple sample;
Judge module 202, judges whether to need MCS for reference sample i+1 and sample i+2
ithreshold value adjust; Specifically, judge module 202, when detecting that the Block Error Rate of sample i+1 is lower, judges to lower MCS
ithreshold value; When detecting that the Block Error Rate of sample i+2 is higher, judge to raise MCS
ithreshold value; When detecting that the Block Error Rate of sample i+1 and sample i+2 is moderate, judge MCS
ithreshold value remain unchanged; And
Threshold adjustment module 203, when judge module 202 judges to need lower timing, lowers this threshold value; When judge module 202 judges to need upper timing, raise this threshold value; When judge module 202 judges without the need to adjusting, threshold value remains unchanged, wherein i be more than or equal to 0 integer.
The method of the method and adjustment threshold value that obtain the sample of each rank MCS is described in detail hereinbefore, is not repeated at this.
By employing according to the method for adjustment of the threshold value of the MCS of the embodiment of the present invention and system, dynamic adjusting thresholds is carried out independently for each rank MCS, the MCS-SINR mapping table on revised theory can be carried out better according to actual scene, thus the speed of the business of guarantee and error block rate requirement, and adopt instantaneous value to carry out the screening of sample according to the MCS threshold adjustment methods of the embodiment of the present invention and system, make the selection of sample meticulousr, more can reflect the channel circumstance in each moment, farthest avoid overshoot.
Although describe embodiments of the present invention by reference to the accompanying drawings, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, such amendment and modification all fall into by within claims limited range.
Claims (8)
1. a threshold adjustment methods for modulation coding mode, comprising:
Obtain multiple sample, described sample is the feedback information once transmitted, and wherein, the modulation coding mode that the transmission that the feedback information in the i-th+2 samples is corresponding adopts is MCS
i, and the modulation coding mode that transmission corresponding to feedback information in first sample adopts is MCS
0;
Judge whether to need modulation coding mode MCS with reference to the i-th+1 sample and the i-th+2 samples
ithreshold value adjust, when judgement need lower timing, lower described threshold value; When judgement needs upper timing, raise described threshold value; When judging without the need to adjusting, described threshold value remains unchanged,
Wherein, i be more than or equal to 0 integer.
2. method according to claim 1, wherein, the multiple sample of described acquisition comprises:
Drop on different threshold intervals according to the Signal to Interference plus Noise Ratio recorded and transmit the modulation coding mode adopted and divide sample space.
3. method according to claim 2, wherein, described Signal to Interference plus Noise Ratio is instantaneous Signal to Interference plus Noise Ratio.
4. according to the method in any one of claims 1 to 3, wherein, described reference the i-th+1 sample and the i-th+2 samples judge whether to need modulation coding mode MCS
ithreshold value carry out adjustment and comprise:
When detecting that the Block Error Rate of the i-th+1 sample is lower, lower modulation coding mode MCS
ithreshold value; When detecting that the Block Error Rate of the i-th+2 samples is higher, raise modulation coding mode MCS
ithreshold value; When detecting that the Block Error Rate of the i-th+1 sample and the i-th+2 samples is moderate, modulation coding mode MCS
ithreshold value remain unchanged, wherein i be more than or equal to 0 integer.
5. an adjusting thresholds system for modulation coding mode, comprising:
Sample collection module, for obtaining multiple sample, described sample is the feedback information once transmitted, and wherein, the modulation coding mode that the transmission that the feedback information in the i-th+2 samples is corresponding adopts is MCS
i, and the modulation coding mode that transmission corresponding to feedback information in first sample adopts is MCS
0;
Judge module, for judging whether to need modulation coding mode MCS with reference to the i-th+1 sample and the i-th+2 samples
ithreshold value adjust; And
Threshold adjustment module, when described judge module judges to need lower timing, lowers described threshold value; When described judge module judges to need upper timing, raise described threshold value; When described judge module judges without the need to adjusting, described threshold value remains unchanged,
Wherein, i be more than or equal to 0 integer.
6. system according to claim 5, wherein, described sample collection module drops on different threshold intervals according to the Signal to Interference plus Noise Ratio recorded and divides sample space with the modulation coding mode adopted.
7. system according to claim 6, wherein, described Signal to Interference plus Noise Ratio is instantaneous Signal to Interference plus Noise Ratio.
8. the system according to any one of claim 5 to 7, wherein, described judge module, when detecting that the Block Error Rate of the i-th+1 sample is lower, judges to lower modulation coding mode MCS
ithreshold value; When detecting that the Block Error Rate of the i-th+2 samples is higher, judge to raise modulation coding mode MCS
ithreshold value; When detecting that the Block Error Rate of the i-th+1 sample and the i-th+2 samples is moderate, judge modulation coding mode MCS
ithreshold value remain unchanged, wherein i be more than or equal to 0 integer.
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Application publication date: 20150318 |