CN107465482A - A kind of modulation coding mode MCS determination method and device - Google Patents
A kind of modulation coding mode MCS determination method and device Download PDFInfo
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- CN107465482A CN107465482A CN201610388414.5A CN201610388414A CN107465482A CN 107465482 A CN107465482 A CN 107465482A CN 201610388414 A CN201610388414 A CN 201610388414A CN 107465482 A CN107465482 A CN 107465482A
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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
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
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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
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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Abstract
The invention discloses a kind of modulation coding mode MCS determination method and device, its method includes：According to the channel parameter of current radio link, an initial MCS grades are determined；The desired value of the value of a special parameter in channel parameter special parameter corresponding with specific MCS grades, it is determined that the correction value of initial MCS grades；According to initial MCS grades and correction value, it is determined that final MCS grades.The present invention is modified to UE MCS grades according to MCS demodulation performance, to obtain suitable MCS grades, effectively prevents MCS concussion problem, reduce UE Packet Error Ratio, improve wireless resource utility efficiency.
Description
Technical field
The present invention relates to the determination method and dress of mobile communication technology field, more particularly to a kind of modulation coding mode MCS
Put.
Background technology
OFDM (OFDM, Orthogonal Frequency Division Multiplexing) technology, by
In with spectrum efficiency is high, autgmentability is strong, the scheduling of anti-multipath fading, frequency domain adaptive and realize multiple-input and multiple-output (MIMO,
Multiple Input Multiple Output) technology it is simpler the features such as.With wireless communication technique continuous development and
Progressive, in order to better meet user to the demand that extends to more preferably cover when higher rate, smaller wait, mobile communication is from the 3rd
Third-generation mobile communication technology (3G, 3rd-Generation) quickly to using OFDM as core technology Long Term Evolution (LTE,
Long Term Evolution) evolution.
The characteristics of wireless channel one is critically important is exactly to have very strong time variation, in order to maximize handling up for raising system
Amount, while controls user equipment (UE, User Equipment) Packet Error Ratio, to meet the communication requirement of different business, it is necessary to
Using effective link adaptation techniques.LTE is by using Adaptive Modulation and Coding (AMC, Adaptive Modulation
Coding) technology come according to the situation of channel variation change currently transmitted signal modulation coding mode (MCS,
Modulationand Coding Scheme), with compensate due to channel variation to caused by reception signal influence of fading.For
The UE to sit pretty, such as the usable high order modulations (64QAM or 256QAM) of UE and high code check (big code block close to base station
Data), and the UE in unfavorable position, such as the UE of cell edge then use low-order-modulated (QPSK) and low bit- rate (small code block
Data) so that UE can automatically adapt to the situation of channel, and make full use of Radio Resource.
At present in LTE system, AMC technologies add the method for outer shroud to determine current radio channel quality condition using inner ring
Under MCS.Inner ring MCS is that the channel quality measured according to UE indicates (CQI, Channel Quality Indicator) to determine
Fixed.Outer shroud MCS is that the Packet Error Ratio (PER, Packet Error Ratio) wrapped according to the scheduling in one section of cycle is adjusted
, that is, a target Packet Error Ratio is set, when the Packet Error Ratio counted in one section of cycle is less than target Packet Error Ratio, inner ring MCS's
On the basis of improve corresponding △ MCS (MCS deviations)；When the Packet Error Ratio counted in one section of cycle is higher than target Packet Error Ratio, inside
Corresponding △ MCS are reduced on the basis of ring MCS.AMC determines UE MCS according to inner ring △ MCS and outer shroud △ MCS, by Packet Error Ratio
Control is in the range of target Packet Error Ratio.
Above-mentioned AMC algorithms are based on a basic premise, and exactly different MCS are linear passes with the SINR needed for demodulation
System.But found from emulation and actual measurement, as shown in figure 1, different MCS are not linear passes with the SINR needed for demodulation
System, such as MCS=27 are increased to the SINR needed for MCS=28, hence it is evident that the SINR being increased to than MCS=26 needed for MCS=27 is high
A lot, outer shroud MCS adjustment is so carried out using identical target Packet Error Ratio to MCS=26 and MCS=27, will result in target
Packet Error Ratio is suitable to MCS=26, but to the inappropriate situations of MCS=27.I.e. when UE MCS=26, Packet Error Ratio is low
In target Packet Error Ratio, MCS is heightened to 27 and is possible by outer shroud.When UE MCS=27, Packet Error Ratio wraps by mistake less than target
Rate, outer shroud heighten MCS to 28, and Packet Error Ratio can be steeply risen, and now MCS is recalled to 27 by outer shroud, and Packet Error Ratio declines, and outer shroud again will
MCS is transferred to 28, i.e. UE MCS vibrates back and forth between 27 and 28, influences UE performance.
The content of the invention
The invention provides a kind of modulation coding mode MCS determination method and device, solves concussion during MCS switchings
Problem.
According to one aspect of the present invention, there is provided a kind of modulation coding mode MCS determination method, including：
According to the channel parameter of current radio link, an initial MCS grades are determined；
The desired value of the value of a special parameter in channel parameter special parameter corresponding with specific MCS grades, really
The correction value of fixed initial MCS grades；
According to initial MCS grades and correction value, it is determined that final MCS grades.
Wherein, according to the channel parameter of current radio link, the step of determining an initial MCS grades, includes：
Obtain the channel quality indicator (CQI) parameter and Packet Error Ratio PER parameters of current radio link；
According to CQI parameter, an inner ring MCS grades are determined；
According to PER parameters, an outer shroud MCS grades are determined；
According to inner ring MCS grades and outer shroud MCS grades, an initial MCS grades are determined.
Wherein, the value of the special parameter in channel parameter special parameter desired value corresponding with specific MCS grades,
It is determined that the step of correction value of initial MCS grades, includes：
Obtain the Packet Error Ratio PER measured values corresponding to specific MCS grades in channel parameter in measurement period；
According to PER measured values PER desired values corresponding with the upper MCS grades of initial MCS grades, it is determined that initial MCS etc.
The correction value of level；Wherein, the PER desired values corresponding to different MCS grades are different.
Wherein, according to PER measured values PER desired values corresponding with the upper MCS grades of initial MCS grades, it is determined that initially
The step of correction value of MCS grades, includes：
Obtain the PER desired values corresponding to a MCS grades in initial MCS grades；
According to PER measured values and PER desired values, it is determined that the correction value of initial MCS grades；Wherein,
When PER measured values are less than PER desired values, it is 0 to determine correction value；Otherwise, it determines correction value is -1.
Wherein, according to initial MCS grades and correction value, it is determined that the step of final MCS grades include：
MCS grades are superimposed with correction value, obtain final MCS grades.
According to another aspect of the present invention, a kind of modulation coding mode MCS determining device is additionally provided, including：
First processing module, for the channel parameter according to current radio link, determine an initial MCS grades；
Second processing module, the value for the special parameter in channel parameter are corresponding with specific MCS grades special
The desired value of parameter is determined, it is determined that the correction value of initial MCS grades；
3rd processing module, for according to initial MCS grades and correction value, it is determined that final MCS grades.
Wherein, the first processing module includes：
First acquisition unit, for obtaining the channel quality indicator (CQI) parameter and Packet Error Ratio PER ginsengs of current radio link
Number；
First computing unit, for according to CQI parameter, determining an inner ring MCS grades；
Second computing unit, for according to PER parameters, determining an outer shroud MCS grades；
First processing units, for according to inner ring MCS grades and outer shroud MCS grades, determining an initial MCS grades.
Wherein, the Second processing module includes：
Second acquisition unit, for obtaining the Packet Error Ratio PER corresponding to specific MCS grades in channel parameter in measurement period
Measured value；
Second processing unit, for according to PER measured values PER targets corresponding with the upper MCS grades of initial MCS grades
Value, it is determined that the correction value of initial MCS grades；Wherein, the PER desired values corresponding to different MCS grades are different.
Wherein, the second processing unit includes：
Subelement is obtained, for obtaining the PER desired values in initial MCS grades corresponding to a MCS grades；
Subelement is handled, for according to PER measured values and PER desired values, it is determined that the initially correction value of MCS grades；Wherein,
When PER measured values are less than PER desired values, it is 0 to determine correction value；Otherwise, it determines correction value is -1.
Wherein, the 3rd processing module includes：
3rd processing unit, for MCS grades to be superimposed with correction value, obtain final MCS grades.
The beneficial effect of embodiments of the invention is：
According to MCS demodulation performance, UE MCS grades are modified, to obtain suitable MCS grades, effectively prevented
MCS concussion problem, UE Packet Error Ratio is reduced, improve wireless resource utility efficiency.
Brief description of the drawings
Fig. 1 represents different MCS demodulation performance curve map；
Fig. 2 represents the schematic flow sheet of modulation coding mode MCS of the present invention determination method；
Fig. 3 represents the module diagram of modulation coding mode MCS of the present invention determining device.
Embodiment
The exemplary embodiment of the present invention is more fully described below with reference to accompanying drawings.Although the present invention is shown in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the present invention without should be by embodiments set forth here
Limited.Conversely, there is provided these embodiments are to be able to be best understood from the present invention, and can be by the scope of the present invention
Completely it is communicated to those skilled in the art.
Embodiment one
As shown in Fig. 2 the embodiment provides a kind of modulation coding mode MCS determination method, specifically include：
Step 21：According to the channel parameter of current radio link, an initial MCS grades are determined.
Wherein, channel parameter includes the parameter of multiple sign wireless link channel quality, such as：Reference signal launches work(
Rate, transmission signal to noise ratio, packet loss and bit error rate etc..The MCS grades that are determined according to different radio link transmission environment are tackled
Error code.What MCS grades were typically determined jointly by parameters such as CQI parameter, IBLER parameters, PC+ICIC parameters.
Step 22：The mesh of the value of a special parameter in channel parameter special parameter corresponding with specific MCS grades
Scale value, it is determined that the correction value of initial MCS grades.
, here can be according to the demodulation performance of different MCS grades due to MCS grades and SINR and non-linear relation needed for demodulation
Required parameter determines the desired value of its special parameter, i.e., different MCS grades correspond to different parameter objectives values, and MCS etc.
Level parameter objectives value between and non-linear relation.Wherein it is worthy of note that, the parameter objectives value corresponding to different MCS grades
It can be obtained by emulating or testing.
Step 23：According to initial MCS grades and correction value, it is determined that final MCS grades.
The target of certain special parameter special parameter corresponding with specific MCS grades so in actual channel parameter
Value, it may be determined that whether initial MCS grades need amendment and correction value.That is determined just according to currently practical channel quality
Whether beginning MCS grade is suitable, then selects initial MCS grades if appropriate, it is entered using correction value if improper
Row amendment.
Specifically, above-mentioned steps 21 specifically include：Obtain the channel quality indicator (CQI) parameter of current radio link and wrap by mistake
Rate PER parameters；According to CQI parameter, an inner ring MCS grades are determined；According to PER parameters, an outer shroud MCS grades are determined；According to interior
Ring MCS grades and outer shroud MCS grades, determine an initial MCS grades.
Such as：Descending UE is mapped to CQI parameter according to the CRS SINR of measurement.Up eNB is obtained by DMRS or SRS measurements
Take up CQI parameter.The CQI (full band or subband) or up CQI, eNB reported for UE constrains according to PC first, ICIC constraints
CQI is adjusted with IBLER situations, then 4bits CQI is mapped as to 5bits MCS.
Further, step 22 includes：Obtain the Packet Error Ratio corresponding to specific MCS grades in channel parameter in measurement period
PER measured values；According to PER measured values PER desired values corresponding with the upper MCS grades of initial MCS grades, it is determined that initial MCS
The correction value of grade.
Here it is to say after initial MCS grades are determined, initial MCS grades is determined according to the transmission environment of current radio link
Whether need to correct.Wherein, the PER desired values corresponding to different MCS grades are different.That is, it is respective according to different MCS grades
Demodulation performance, it is each MCSiGrade sets a target Packet Error Ratio to be designated as TargetPERi, TargetPERiValue can pass through
Emulation or test obtain, wherein, i=0,1,2 ..., 28.
Further, wherein, according to initial MCS grades and correction value, it is determined that the step of final MCS grades include：By MCS
Grade is superimposed with correction value, obtains final MCS grades.
Wherein, according to PER measured values PER desired values corresponding with the upper MCS grades of initial MCS grades, it is determined that initially
The step of correction value of MCS grades, includes：Obtain the PER desired values corresponding to a MCS grades in initial MCS grades；According to PER
Measured value and PER desired values, it is determined that the correction value of initial MCS grades；Wherein, when PER measured values are less than PER desired values, really
Periodical repair is on the occasion of for 0；Otherwise, it determines correction value is -1.That is, PER measured values, i.e. MCS in nearest one section of measurement period are countedi-1
PER corresponding to gradei-1, by PER measured values PER desired values ratio corresponding with the upper level MCS grades of initial MCS grades
Compared with.Work as PERi-1＜ TargetPERi-1When, it is 0 to determine correction value, that is to say, that the Packet Error Ratio of the MCS grades of a upper grade is less than
Target Packet Error Ratio, current channel condition can support the MCS grades of greater degree to be demodulated；Work as PERi-1≥TargetPERi-1
When, it is -1 to determine correction value, that is to say, that the Packet Error Ratio of the MCS grades of a upper grade is higher than target Packet Error Ratio, present channel bar
Part is not enough to support the MCS grades of greater degree to be demodulated, and should suitably reduce MCS grades.Such as：Assuming that MCS=27 mesh
Packet Error Ratio=0.05 is marked, if the Packet Error Ratio of MCS=27 scheduling bag is 0.1 in one section of cycle, then as obtained initial MCS etc.
Level needs to reduce MCS grades when being 28, and amendment obtains MCS=27.If the Packet Error Ratio of MCS=27 scheduling bag is in one section of cycle
0.02, then illustrate that current radio link quality meets the demodulation requirement for improving MCS grades, correction value 0, amendment obtains MCS
=28.So by the method for amendment MCS grades can be prevented to be increased to 28 too quickly, allow UE MCS grades more smoothly
28 are increased to from 27, rather than is shaken back and forth between 27 and 28, effectively reduces UE Packet Error Ratio, Radio Resource is improved and utilizes
Rate.
Embodiment two
As shown in figure 3, additionally providing a kind of modulation coding mode MCS determining device in embodiments of the invention two, wrap
Include：
First processing module 31, for the channel parameter according to current radio link, determine an initial MCS grades；
Second processing module 32, the value for the special parameter in channel parameter are corresponding with specific MCS grades
The desired value of special parameter, it is determined that the correction value of initial MCS grades；
3rd processing module 33, for according to initial MCS grades and correction value, it is determined that final MCS grades.
Wherein, the first processing module 31 includes：
First acquisition unit, for obtaining the channel quality indicator (CQI) parameter and Packet Error Ratio PER ginsengs of current radio link
Number；
First computing unit, for according to CQI parameter, determining an inner ring MCS grades；
Second computing unit, for according to PER parameters, determining an outer shroud MCS grades；
First processing units, for according to inner ring MCS grades and outer shroud MCS grades, determining an initial MCS grades.
Wherein, the Second processing module 32 includes：
Second acquisition unit, for obtaining the Packet Error Ratio PER corresponding to specific MCS grades in channel parameter in measurement period
Measured value；
Second processing unit, for according to PER measured values PER targets corresponding with the upper MCS grades of initial MCS grades
Value, it is determined that the correction value of initial MCS grades；Wherein, the PER desired values corresponding to different MCS grades are different.
Wherein, the second processing unit includes：
Subelement is obtained, for obtaining the PER desired values in initial MCS grades corresponding to a MCS grades；
Subelement is handled, for according to PER measured values and PER desired values, it is determined that the initially correction value of MCS grades；Wherein,
When PER measured values are less than PER desired values, it is 0 to determine correction value；Otherwise, it determines correction value is -1.
Wherein, the 3rd processing module 33 includes：
3rd processing unit, for MCS grades to be superimposed with correction value, obtain final MCS grades.
It should be noted that the device is device corresponding with above-mentioned modulation coding mode MCS determination method, above-mentioned side
All implementations can also reach identical technique effect suitable for the embodiment of the device in method embodiment.
Above-described is the preferred embodiment of the present invention, it should be pointed out that is come for the ordinary person of the art
Say, some improvements and modifications can also be made under the premise of principle of the present invention is not departed from, and these improvements and modifications also exist
In protection scope of the present invention.
Claims (10)
- A kind of 1. modulation coding mode MCS determination method, it is characterised in that including：According to the channel parameter of current radio link, an initial MCS grades are determined；The desired value of the value of a special parameter in channel parameter special parameter corresponding with specific MCS grades, really The correction value of the fixed initial MCS grades；According to the initial MCS grades and the correction value, it is determined that final MCS grades.
- 2. modulation coding mode MCS according to claim 1 determination method, it is characterised in that according to current radio chains The channel parameter on road, the step of determining an initial MCS grades, include：Obtain the channel quality indicator (CQI) parameter and Packet Error Ratio PER parameters of current radio link；According to the CQI parameter, an inner ring MCS grades are determined；According to the PER parameters, an outer shroud MCS grades are determined；According to the inner ring MCS grades and the outer shroud MCS grades, an initial MCS grades are determined.
- 3. modulation coding mode MCS according to claim 1 determination method, it is characterised in that joined according to the channel The value of a special parameter in number special parameter desired value corresponding with specific MCS grades, determine repairing for the initial MCS grades On the occasion of the step of include：Obtain the Packet Error Ratio PER measured values corresponding to specific MCS grades in the channel parameter in measurement period；According to PER measured values PER desired values corresponding with the upper MCS grades of the initial MCS grades, determine described first The correction value of beginning MCS grade；Wherein, the PER desired values corresponding to different MCS grades are different.
- 4. modulation coding mode MCS according to claim 3 determination method, it is characterised in that measured according to the PER It is worth PER desired values corresponding with the upper MCS grades of the initial MCS grades, determines the correction value of the initial MCS grades Step includes：Obtain the PER desired values corresponding to a MCS grades in the initial MCS grades；According to the PER measured values and the PER desired values, the correction value of the initial MCS grades is determined；Wherein,When the PER measured values are less than the PER desired values, it is 0 to determine the correction value；Otherwise, it determines the correction value For -1.
- 5. modulation coding mode MCS according to claim 1 determination method, it is characterised in that according to the initial MCS Grade and the correction value, it is determined that the step of final MCS grades include：The MCS grades are superimposed with the correction value, obtain final MCS grades.
- A kind of 6. modulation coding mode MCS determining device, it is characterised in that including：First processing module, for the channel parameter according to current radio link, determine an initial MCS grades；Second processing module, the value for the special parameter in the channel parameter are corresponding with specific MCS grades special Determine the desired value of parameter, determine the correction value of the initial MCS grades；3rd processing module, for according to the initial MCS grades and the correction value, it is determined that final MCS grades.
- 7. modulation coding mode MCS according to claim 6 determining device, it is characterised in that the first processing mould Block includes：First acquisition unit, for obtaining the channel quality indicator (CQI) parameter and Packet Error Ratio PER parameters of current radio link；First computing unit, for according to the CQI parameter, determining an inner ring MCS grades；Second computing unit, for according to the PER parameters, determining an outer shroud MCS grades；First processing units, for according to the inner ring MCS grades and the outer shroud MCS grades, determining an initial MCS grades.
- 8. modulation coding mode MCS according to claim 6 determining device, it is characterised in that the second processing mould Block includes：Second acquisition unit, for obtaining the Packet Error Ratio PER corresponding to specific MCS grades in the channel parameter in measurement period Measured value；Second processing unit, for according to PER measured values PER corresponding with the upper MCS grades of the initial MCS grades Desired value, determine the correction value of the initial MCS grades；Wherein, the PER desired values corresponding to different MCS grades are different.
- 9. modulation coding mode MCS according to claim 8 determining device, it is characterised in that the second processing list Member includes：Subelement is obtained, for obtaining the PER desired values in the initial MCS grades corresponding to a MCS grades；Subelement is handled, for according to the PER measured values and the PER desired values, determining the amendment of the initial MCS grades Value；Wherein,When the measured value is less than the desired value, it is 0 to determine the correction value；Otherwise, it determines the correction value is -1.
- 10. modulation coding mode MCS according to claim 6 determining device, it is characterised in that the 3rd processing mould Block includes：3rd processing unit, for the MCS grades to be superimposed with the correction value, obtain final MCS grades.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111447041A (en) * | 2019-01-16 | 2020-07-24 | 北京小米松果电子有限公司 | Modulation and coding strategy control method and device, storage medium and electronic equipment |
| WO2021047456A1 (en) * | 2019-09-10 | 2021-03-18 | 中兴通讯股份有限公司 | Link adaptation adjustment method, device, server and storage medium |
| CN112929980A (en) * | 2019-12-06 | 2021-06-08 | 中兴通讯股份有限公司 | Initial MCS value determination method, electronic device and storage medium |
| CN113824531A (en) * | 2020-06-18 | 2021-12-21 | ***通信集团吉林有限公司 | Method and device for generating coding rate, base station and storage medium |
| WO2023241309A1 (en) * | 2022-06-16 | 2023-12-21 | 中兴通讯股份有限公司 | Adaptive modulation and coding method and apparatus, base station, and storage medium |
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| CN111447041A (en) * | 2019-01-16 | 2020-07-24 | 北京小米松果电子有限公司 | Modulation and coding strategy control method and device, storage medium and electronic equipment |
| WO2021047456A1 (en) * | 2019-09-10 | 2021-03-18 | 中兴通讯股份有限公司 | Link adaptation adjustment method, device, server and storage medium |
| CN112583519A (en) * | 2019-09-10 | 2021-03-30 | 中兴通讯股份有限公司 | Link self-adaptive adjustment method, device, server and storage medium |
| CN112583519B (en) * | 2019-09-10 | 2024-03-12 | 中兴通讯股份有限公司 | Link self-adaptive adjustment method, device, server and storage medium |
| CN112929980A (en) * | 2019-12-06 | 2021-06-08 | 中兴通讯股份有限公司 | Initial MCS value determination method, electronic device and storage medium |
| WO2021109716A1 (en) * | 2019-12-06 | 2021-06-10 | 中兴通讯股份有限公司 | Method for determining initial mcs value, electronic device, and storage medium |
| CN113824531A (en) * | 2020-06-18 | 2021-12-21 | ***通信集团吉林有限公司 | Method and device for generating coding rate, base station and storage medium |
| CN113824531B (en) * | 2020-06-18 | 2023-08-15 | ***通信集团吉林有限公司 | Method and device for generating coding rate, base station and storage medium |
| WO2023241309A1 (en) * | 2022-06-16 | 2023-12-21 | 中兴通讯股份有限公司 | Adaptive modulation and coding method and apparatus, base station, and storage medium |
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Application publication date: 20171212 |