CN106604082A - Downlink adaptive modulation coding method - Google Patents
Downlink adaptive modulation coding method Download PDFInfo
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- CN106604082A CN106604082A CN201611069450.1A CN201611069450A CN106604082A CN 106604082 A CN106604082 A CN 106604082A CN 201611069450 A CN201611069450 A CN 201611069450A CN 106604082 A CN106604082 A CN 106604082A
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- 230000003044 adaptive effect Effects 0.000 title abstract description 4
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
-
- 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
- H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Databases & Information Systems (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
The invention provides a downlink adaptive modulation coding method, comprising the following steps: according to a maximum error code rate, a minimum error code rate and a real-time error code rate of business, judging whether adjustment of modulation and coding strategy orders of the business is needed or not; and if adjustment is needed, adjusting the modulation and coding strategy orders of the business. By use of the method provided by the invention, the modulation and coding strategy of the business can be adjusted into a reasonable range to ensure that adjustment of the modulation and coding strategy of high-rate business is more accurate, and ensure effective transmission of the high-rate business.
Description
Technical field
The present invention is with regard to mobile communication technology field, especially with regard to a kind of down self-adapting modulation coding method.
Background technology
In mobile communication system, the demand of high speed data transmission service constantly increases, especially to the demand of video traffic
Constantly increase.Base station needs to be adaptive selected downlink modulation coding mode to faster and more accurately transmit downlink data
(Modulation and Coding Scheme abbreviation MCS).The transmission performance of MCS is with Signal to Interference plus Noise Ratio
(Signal to Interference plus Noise Ratio abbreviation SINR's) is different and different, in existing system generally
With 10% Block Error Rate to weigh, corresponding SINR value is the demodulation threshold of MCS, by link level simulation method, is given in advance
MCS-SINR mapping tables under specific channel model, provide the SINR value that the corresponding Block Error Rates of every rank MCS are 10%.It is existing adaptive
Ground is answered to select in the method for MCS, base station measures in real time the reception SINR of up channel, then, according to reception SINR, by pre-
If MCS-SINR mapping tables, select the MCS that demodulation threshold is matched with present channel quality.
Chinese patent CN200810000565.4 provides descending self-adapting modulation in a kind of ofdm system and compiles
Code method, by counting the descending bit error rate (Block Error Rate, BLER), the carrier wave and interference noise to terminal to report
Than being adjusted, using the MCS corresponding with interference-to-noise ratio of the carrier wave after adjustment as descending MCS.
Above-mentioned patent is to need terminal to carry out the real-time report to carrier wave and interference-to-noise ratio, and for all of system
Business is identical with the method for adjustment of all ranks.For guarantee bit rate (Guaranteed Bit Rate abbreviation GBR) video industry
The business that this two-forty short delay of being engaged in is required, lack of targeted.
Video traffic typically requires that business is steady, can clear smooth transport, in the situation for meeting business transmission demand, such as
MCS is adjusted to higher MCS by fruit, bit error rate raising is may result in, so that interim card or unsharp occurs in video traffic
Situation.
The content of the invention
A kind of down self-adapting modulation coding method is embodiments provided, with accurate adjustment modulation and coding plan
Slightly.
To achieve these goals, the present invention provides a kind of down self-adapting modulation coding method, and the descending self-adapting is adjusted
Coded method processed includes：
The real-time bit error rate of maximum bit error rate, minimum bit-error rate and business according to business judges whether to need adjustment business
Modulation and coding strategy exponent number；
If it is, the modulation of the business of carrying out is adjusted with coding strategy exponent number.
In one embodiment, the down self-adapting modulation coding method includes：It is that video traffic and non-video business set respectively
Put maximum bit error rate and minimum bit-error rate.
In one embodiment, the real-time bit error rate of maximum bit error rate, minimum bit-error rate and business according to business judges whether
Modulation and the coding strategy exponent number of adjustment business are needed, including：
Whether the real-time bit error rate of business is judged more than the maximum bit error rate, and whether modulate with coding strategy is most
Rudimentary, if in real time the bit error rate is more than the maximum bit error rate, and it is not lowermost level to modulate with coding strategy, then need to lower
The modulation of business and coding strategy exponent number.
In one embodiment, the minimum bit-error rate includes each contrast system of business and the minimum bit-error rate of coding strategy.
In one embodiment, whether the real-time bit error rate of business is judged less than the minimum bit-error rate, and modulate and coding
Whether strategy is highest, if in real time the bit error rate is less than the minimum bit-error rate, and it is not highest to modulate with coding strategy
Level, then need modulation and the coding strategy exponent number of rise business.
In one embodiment, the modulation for carrying out business is adjusted with coding strategy exponent number, including：By the modulation of business and volume
The tactful exponent number of code lowers single order.
In one embodiment, the modulation for carrying out business is adjusted with coding strategy exponent number, including：By the modulation of business and volume
The tactful exponent number of code raises single order.
In the embodiment of the present invention, limiting for maximum MCS can play a protective role to the MCS of business adjustment, by business
MCS adjustment is limited in zone of reasonableness.The present invention can be directed to the different business feature of video and non-video business, adjust MCS
It is more targeted, it is ensured that the MCS of high rate video business adjustment is more accurate and ensures its effective transmission.The present invention is to all
The MCS of business not same order is raised, and arranges different minimum BLER adjustment threshold values, MCS is raised more targetedly, and adjustment is more
Accurately.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the down self-adapting modulation coding method flow chart of the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is the down self-adapting modulation coding method flow chart of the embodiment of the present invention, as shown in figure 1, the row self adaptation
Modulation coding method includes：
S101：The real-time bit error rate of maximum bit error rate, minimum bit-error rate and business according to business judges whether to need to adjust
The modulation of whole business and coding strategy (MCS) exponent number；
S102：If it is, the MCS exponent numbers adjustment of the business of carrying out.
When being embodied as, in order to the MCS exponent numbers for judging whether to business are adjusted, before S101 is judged, need
Maximum bit error rate and minimum bit-error rate are respectively provided with for business.Business is generally divided into two kinds of video traffic and non-video business.
Maximum bit error rate is the maximum bit error rate (value can be obtained by GBR rate calculations) of each rank MCS of business；Or
For the maximum bit error rate of the MCS of business, the MCS of all ranks adopts identical maximum bit error rate, of the invention only with the MCS's of business
Maximum bit error rate is illustrated.
Minimum bit-error rate is the minimum bit-error rate of the MCS of business, and the MCS of all ranks adopts identical maximum bit error rate；Or
Person is the minimum bit-error rate of each rank MCS of business, and the present invention is only illustrated with the maximum bit error rate of each rank MCS of business.
In the embodiment of the present invention, the MCS exponent numbers adjustment of business is carried out, including：The MCS exponent numbers of business are lowered into single order, with
And the MCS exponent numbers of business are raised into single order.
The MCS exponent numbers of business are lowered into single order, is referred to：The video traffic maximum BLER different with non-video business configuration
Value, when the BLER of business is not lowest-order in selection range more than maximum BLER restrictions, and currently used MCS, is carried out
Lower single order MCS.
The MCS exponent numbers of business are raised into single order, is referred to：Same order MCS does not configure different minimum BLER, as the BLER of user
When Packet Error Ratio is less than the minimum BLER that current MCS is arranged, and currently used MCS is when being not highest MCS in selection range, carries out
Raise single order.
During the MCS of downward business, it can be determined that whether the real-time bit error rate of business is more than maximum bit error rate, and judge
Whether MCS is lowermost level, if in real time the bit error rate is more than the maximum bit error rate, and MCS is not lowermost level, then need to lower
The MCS exponent numbers of business, by the MCS exponent numbers of business single order is lowered.
In one embodiment, for video traffic, whether can be needed to lower MCS according to following conditional judgment：
1st, NACK numbers>User transmission result record list greatest length * MAX_BLERvideo, NACK (None
Acknowledge) number is the packet number for acknowledging receipt of；
2nd, the exponent number of current MCS is not lowest-order MCS in the descending MCS selection ranges of video traffic.
If above-mentioned two condition meets simultaneously, then it is assumed that the video traffic meets MCS and lowers condition.
In one embodiment, for non-video business, whether can be needed to lower MCS according to following conditional judgment：
1st, NACK numbers>User transmission result record list greatest length * MAX_BLERdate；
2nd, the exponent number of current MCS is not lowest-order MCS in the descending MCS selection ranges of non-video traffic.
During the MCS of rise business, it can be determined that whether the real-time bit error rate of business is less than minimum bit-error rate, and judge
Whether MCS is highest, if in real time the bit error rate is less than minimum bit-error rate, and MCS is not highest, then need rise business
MCS exponent numbers, the MCS exponent numbers of business are raised into single order.
For GBR traffic, most high-order MCS is obtained for GBR rate calculations in selection range；For non-GBR traffic, model is chosen
Enclose for highest MCS in whole system selection range.
Whether one embodiment, can need to raise MCS according to following conditional judgment：
1st, (ACK number+NACK numbers) >=user transmission result record list greatest length；
2、BLER≤MIN_BLERk, wherein k is the exponent number of current MCS；
3rd, the exponent number of current MCS most high-order MCS not in the descending MCS selection ranges of businessMAX。
The above-mentioned major parameter used is described as follows：
Thresholding is lowered for the video traffic maximum BLER different with non-video business setting, MCS adjustment is made for difference
Traffic performance it is more accurate；All business are directed to simultaneously, and same order MCS is not raised and arranged different minimum BLER thresholdings, adjusts MCS
It is more accurate.
MAX_BLERvideo(video traffic lowers the maximum BLER of MCS)
Video traffic is to speed and postpones have high requirement, and for the traffic performance of video, configuration video traffic is lowered
The maximum BLER of MCS.
MAX_BLERdate(non-video business lowers the maximum BLER of MCS)
Non-video business is to speed and postpones have high requirement, for the traffic performance of non-video, configures non-video industry
The maximum BLER of MCS is lowered in business.
MIN_BLERk(the minimum BLER that timing is not arranged on same order MCS)
The difference that the configuration pin of the value is configured to the MCS of not same order, k is currently used MCS exponent numbers, and the number of the value is
M-1, M is total exponent number of system MCS.
For example：MCS has 0～14 rank, totally 15 rank.Then, the 0th rank goes up timing to the 1st rank, and the minimum BLER of setting is MIN_
BLER1, to the upper timing of the 2nd rank, the minimum BLER of setting is MIN_BLER to the 1st rank2,
MCSMAX(selectable highest MCS when business raises MCS)
For non-GBR traffic, the value is the most high-order of all MCS in system；For GBR traffic, the value is calculated as follows：
1) according to GBR rate calculations TBS (Tbsize) size, formula is as follows：
Tbsize*N* η=descending gbr speed；
Tbsize=gbr speed/(η * N)；
Wherein, N is descending sub frame number in 1s, and η is the payload ratio factor, typically takes 0.9.
2) tabled look-up (TBS/ subbands speed/MCS tables) according to TBS and speed sub-band number, check in ITBS
3) according to ITBSTable look-up (TBS/ subbands speed/MCS tables), obtain MCS.
The present invention configures different maximum BLER values according to different service types, according to the difference of current MCS during rise MCS
Rank configures different minimum BLER values, and GBR traffic through-rate obtains maximum MCS and limits, and MCS adjustment is more directed to
Property, more accurately.
The present invention be directed to GBR traffic, carried out raise MCS when maximum MCS restriction, the maximum is by GBR speedometers
Obtain.Because requirement of the GBR traffic to speed is strict, limiting for maximum MCS can play protection work to the MCS of business adjustment
With the MCS of business adjustment is limited in into zone of reasonableness.
The present invention adjusts threshold value for the video traffic maximum BLER different with the downward MCS settings of non-video business,
The different business feature of video and non-video business can be directed to, makes MCS adjustment more targeted, it is ensured that high rate video business
MCS adjustment more accurate ensure its effective transmission simultaneously.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can be using complete hardware embodiment, complete software embodiment or with reference to the reality in terms of software and hardware
Apply the form of example.And, the present invention can be adopted and wherein include the computer of computer usable program code at one or more
The computer program implemented in usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.) is produced
The form of product.
The present invention is the flow process with reference to method according to embodiments of the present invention, equipment (system) and computer program
Figure and/or block diagram are describing.It should be understood that can be by computer program instructions flowchart and/or each stream in block diagram
The combination of journey and/or square frame and flow chart and/or the flow process in block diagram and/or square frame.These computer programs can be provided
The processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced for reality by the instruction of computer or the computing device of other programmable data processing devices
The device of the function of specifying in present one flow process of flow chart or one square frame of multiple flow processs and/or block diagram or multiple square frames.
These computer program instructions may be alternatively stored in can guide computer or other programmable data processing devices with spy
In determining the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory is produced to be included referring to
Make the manufacture of device, the command device realize in one flow process of flow chart or one square frame of multiple flow processs and/or block diagram or
The function of specifying in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented process, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow process of flow chart or multiple flow processs and/or block diagram one
The step of function of specifying in individual square frame or multiple square frames.
Apply specific embodiment in the present invention to be set forth the principle and embodiment of the present invention, above example
Explanation be only intended to help and understand the method for the present invention and its core concept；Simultaneously for one of ordinary skill in the art,
According to the thought of the present invention, will change in specific embodiments and applications, in sum, in this specification
Appearance should not be construed as limiting the invention.
Claims (7)
1. a kind of down self-adapting modulation coding method, it is characterised in that include：
The real-time bit error rate of maximum bit error rate, minimum bit-error rate and business according to business judges whether to need the tune of adjustment business
System and coding strategy exponent number；
If it is, the modulation of the business of carrying out is adjusted with coding strategy exponent number.
2. down self-adapting modulation coding method according to claim 1, it is characterised in that also include：For video traffic
And non-video business is respectively provided with maximum bit error rate and minimum bit-error rate.
3. down self-adapting modulation coding method according to claim 1, it is characterised in that according to the maximum error code of business
The real-time bit error rate of rate, minimum bit-error rate and business judges whether modulation and the coding strategy exponent number for needing adjustment business, including：
Whether the real-time bit error rate of business is judged more than the maximum bit error rate, and whether modulate with coding strategy is minimum
Level, if in real time the bit error rate is more than the maximum bit error rate, and it is not lowermost level to modulate with coding strategy, then need to lower industry
The modulation of business and coding strategy exponent number.
4. down self-adapting modulation coding method according to claim 2, it is characterised in that the minimum bit-error rate includes
Each contrast system of business and the minimum bit-error rate of coding strategy.
5. the down self-adapting modulation coding method according to claim 1,2 or 4, it is characterised in that judge the reality of business
When the bit error rate whether be less than the minimum bit-error rate, and modulate with whether coding strategy is highest, if the bit error rate in real time
Less than the minimum bit-error rate, and it is not highest to modulate with coding strategy, then need modulation and the coding plan of rise business
Omit exponent number.
6. down self-adapting modulation coding method according to claim 3, it is characterised in that the modulation for carrying out business
Adjust with coding strategy exponent number, including：Single order is lowered in the modulation of business and coding strategy exponent number.
7. down self-adapting modulation coding method according to claim 5, it is characterised in that the modulation for carrying out business
Adjust with coding strategy exponent number, including：Single order is raised in the modulation of business and coding strategy exponent number.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611069450.1A CN106604082A (en) | 2016-11-29 | 2016-11-29 | Downlink adaptive modulation coding method |
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| CN201611069450.1A CN106604082A (en) | 2016-11-29 | 2016-11-29 | Downlink adaptive modulation coding method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108337068A (en) * | 2018-01-17 | 2018-07-27 | 广东欧珀移动通信有限公司 | Data communicate and Related product |
| CN108900278A (en) * | 2018-06-08 | 2018-11-27 | Oppo广东移动通信有限公司 | A kind of method of adjustment of modulation demodulation system, terminal and computer storage medium |
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| US20130022145A1 (en) * | 2010-04-13 | 2013-01-24 | Nvidia Technology Uk Limited | Deciding the order of sic detection by adjusting mcs |
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2016
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| CN101494515A (en) * | 2008-01-22 | 2009-07-29 | 中兴通讯股份有限公司 | Down self-adapting modulation coding method and base station of OFDM system |
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Application publication date: 20170426 |