CN103369602A - Wireless data transmission method for adjusting parameters according to changes of both signal source and signal channel - Google Patents
Wireless data transmission method for adjusting parameters according to changes of both signal source and signal channel Download PDFInfo
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Abstract
Provided is a wireless data transmission method for adjusting parameters according to changes of both a signal source and a signal channel. The wireless data transmission method enables wireless data transmission parameters to be dynamically adjusted according to both change of QoS requirements of different transmission media and change of the fading level of a wireless channel by making full use of dual time-variable characteristics of a transmission media service and a wireless transmission channel of a mobile multimedia communication system, enables data rates and the maximum delay requirements of different media services to be achieved by dynamically allocating dedicated service channels, and enables BER performance requirements of different media services to be met by dynamically changing the code rate of a coder and the constellation size of a modulator and adopting channel inversion power control. Meanwhile, the spectrum utilization rate of a wireless communication system is maximized.
Description
Technical field
The present invention relates to a kind of while according to the radio data transmission method of information source and channel variation adjustment parameter.
Background technology
It reliably and efficiently is the main target in the digital communication system design always, and mobile multimedia communication has proposed stricter requirement to reliability and the high efficiency of system: on the one hand, the integrated transmission of different media, require communication system can the time wireless channel that becomes satisfy the QoS(service quality of different media) requirement; And on the other hand, the restriction of wireless frequency spectrum and terminal volume requires again system must utilize limited bandwidth and power, and higher transmission rate is provided.For this have concurrently time varying channel and the time become the key property of information source, as adopt present traditional design method, namely under the channel extreme conditions, the QoS of the most harsh media business designs fixing transmission plan on request, though can reach the purpose that satisfies all media business qos requirements, can cause inevitably the level of resources utilization in the most of the time low.
Summary of the invention
A kind of while provided by the invention is adjusted the radio data transmission method of parameter according to information source and channel variation, make transformation parameter not only be adaptive to the variation of wireless channel decline, and be adaptive to the qos requirement of different transmission mediums, thereby can improve to greatest extent the availability of frequency spectrum of wireless communication system, and then make system that higher user capacity can be provided under limited frequency spectrum resource.
In order to achieve the above object, the invention provides a kind of while according to the radio data transmission method of information source and channel variation adjustment parameter, comprise following steps:
Step 1, QoS of survice parameter decision;
Media service type according to current transmission: speech, video or data, determine qos parameter, comprise bit error rate BER, data rate and maximum delay;
Decision criteria is:
1, voice service: BER=10
-3Data rate=16Kbps; Maximum delay=30ms;
2, video traffic: BER=10
-4The Kbps of data rate=(16*N), N=1,2 ..., M, M are speed grade; Maximum delay=30ms;
3, data service: BER=10
-6The Kbps of data rate=(16*Nc), Nc is maximum available dedicated traffic channel number at that time; Maximum delay=do not limit.
Step 2, according to the data rate in the qos parameter and maximum delay requirement, be that media business distributes required Dedicated Traffic Channel;
Distribution principle is:
Voice service and data service send resource allocation request by Random Access Channel to base station BS;
Video traffic is then passed to BS with business data flow by Dedicated Traffic Channel with solicited message;
Base station BS is that each successful voice service request distributes a recently available Dedicated Traffic Channel, and the bit rate of deciding that carries out low rate transmits;
For video traffic, base station BS is its distribution according to solicited message or upgrades recently available Dedicated Traffic Channel group, realizes the variable bit rate parallel transmission of two-forty;
Disconnected data service allows base station BS to distribute all available farthest Dedicated Traffic Channels for it, finishes the Available Bit Rate transmission;
Regulation voice service and video traffic have the priority higher than data service, are not having can to deprive the Dedicated Traffic Channel of distributing to data service under the condition of enough idling-resources;
The BER requirement of different media business realizes by the channel self-adapting coded modulation;
Step 3, the channel signal to noise ratio is divided into a data rate domain of mutually adjoining, is expressed as respectively, ...,, wherein;
Step 4, distribute corresponding coded modulation scheme for each rate domain:, wherein, be the code check of encoder, be the constellation size of modulator, set,, wherein, the expression transmission suspends;
Coding demodulator structure and decoding algorithm remain unchanged in all rate domain, only change code check and constellation size;
Step 5, obtain the BER-SNR(signal to noise ratio of above-mentioned each coded modulation scheme on additive white Gaussian noise (AWGN) channel by theory analysis or Computer Simulation) performance curve, and by the BER requirement of each BER-SNR curve and different media business, obtain the SNR value that each media business will be kept in each rate domain;
Step 6, with the BER requirement in the qos parameter, find the solution the rate domain border corresponding with it;
Adopt Sequential Quadratic Programming method (SQP) to determine the rate domain border of different media business (being the unknown quantity in target function and the constraint function, can the value of solving by SQP optimization method and target function and constraint function expression formula);
When implementing SQP method optimized design, require the gap between system's average throughput and the unit bandwidth channel capacity as far as possible little, so determine that target function is as follows:
(1) wherein, be the capacity of fading channel, be channel width, for probability distribution;
For satisfying power constraint, when implementing the SQP method, determine that constraint function is:
(2) wherein, can reach each media business BER when adopting coded modulation scheme on the awgn channel and require required performance number, be monolateral noise density;
Step 7, (be that channel estimation module by receiving terminal produces according to the current channel estimation value that receives from feedback channel, can adopt the channel estimation method of various maturations to obtain) rate domain that falls into, choose corresponding encoder code check and modulator constellation size and carry out Wireless Data Transmission;
Step 8, according to current channel estimation value, take channel counter-rotating power control method to determine current through-put power; Through-put power is
(3) wherein, be average signal-to-noise ratio;
After step 9, current media business are transmitted, switch to other media service type such as need, then repeat said process.
The present invention takes full advantage of the time-varying characteristics of channel and QoS, has significantly improved the spectrum efficiency of system.The key performances such as average power restriction, service disconnection probability and Mean Speed territory duration that affect practicality all reach reasonable level, and the coding demodulator structure remains unchanged in all rate domain with decoding algorithm, thus practical, be easy to realization.
Description of drawings
Fig. 1 is the specific embodiments of the invention schematic flow sheets.
Embodiment
Following according to Fig. 1, specify preferred embodiment of the present invention.
As shown in Figure 1, adopted in this embodiment the direct sequence CDMA technology, time slot and spreading code are mapped as basic logic channel.The code efficiency of coding demodulator, constellation size and through-put power are variable, and coding demodulator structure and decoding algorithm remain unchanged in all rate domain.
For each user, different media business are multiplexed with integrated data stream, after channel coding, modulation and the power control, by one or more spreading code parallel transmissions.Take the media service type of current transmission as parameter, distribute Dedicated Traffic Channel (spreading code) according to step 2, thereby reach data rate and maximum delay requirement.Meanwhile, with the BER requirement in the qos parameter of transmission medium, according to step 6, determine the rate domain border corresponding with it by adopting the SQP method to calculate the optimization problem that is consisted of by formula (1) and formula (2).At last, according to the rate domain that the channel estimation value that receives from feedback channel falls into, choose corresponding coded modulation scheme, namely determine the code check of encoder and the constellation size of modulator, to carry out Wireless Data Transmission, through-put power is then determined by formula (3).After user's current media business is transmitted, when switching to other media service type and transmit such as need, then repeat said process.
Receiving terminal adopts fixing decoding algorithm to carry out the demodulation code by the demodulating and decoding device on the one hand, and the integrated data stream of output finally is separated into different media business by demodulation multiplexer by after carrying out to received signal despreading and processing; Obtain current channel estimation value and in time pass to transmitting terminal by feedback channel by channel estimator on the other hand.
The present invention takes full advantage of the dual time-varying characteristics of the existing transmission medium business of Multimedia Mobile Communication Systems and wireless transmission channel, the Wireless Data Transmission parameter is changed simultaneously and the variation of wireless channel decline grade and dynamically adjustment according to the qos requirement of different transmission mediums, realize data rate and the maximum delay requirement of different media business by the dynamic assignment Dedicated Traffic Channel, by dynamic change encoder code check and modulator constellation size and adopt channel counter-rotating power to control to satisfy the BER performance requirement of different media business, improved to greatest extent the availability of frequency spectrum of wireless communication system simultaneously.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (4)
1. while is adjusted the radio data transmission method of parameter according to information source and channel variation, it is characterized in that the method includes the steps of:
Step 1, QoS of survice parameter decision;
Media service type according to current transmission: speech, video or data, determine qos parameter, comprise bit error rate BER, data rate and maximum delay;
Step 2, according to the data rate in the qos parameter and maximum delay requirement, be that media business distributes required Dedicated Traffic Channel;
Step 3, the channel signal to noise ratio is divided into a data rate domain of mutually adjoining, is expressed as respectively, ...,, wherein;
Step 4, distribute corresponding coded modulation scheme for each rate domain:, wherein, be the code check of encoder, be the constellation size of modulator, set,, wherein, the expression transmission suspends;
Step 5, obtain the BER-SNR performance curve of above-mentioned each coded modulation scheme on the additive white Gaussian noise awgn channel by theory analysis or Computer Simulation, and by the BER requirement of each BER-SNR curve and different media business, obtain the signal to noise ratio snr value that each media business will be kept in each rate domain;
Step 6, with the BER requirement in the qos parameter, find the solution the rate domain border corresponding with it;
Adopt Sequential Quadratic Programming method SQP optimized design to determine the rate domain border of different media business;
Gap between requirement system average throughput and the unit bandwidth channel capacity is as far as possible little, so determine that target function is as follows:
(1) wherein, be the capacity of fading channel, be channel width, for probability distribution;
For satisfying power constraint, when implementing the SQP method, determine that constraint function is:
(2) wherein, can reach each media business BER when adopting coded modulation scheme on the awgn channel and require required performance number, be monolateral noise density;
The rate domain that the current channel estimation value that step 7, basis receive from feedback channel falls into is chosen corresponding encoder code check and modulator constellation size and is carried out Wireless Data Transmission;
Step 8, according to current channel estimation value, take channel counter-rotating power control method to determine current through-put power; Through-put power is
(3) wherein, be average signal-to-noise ratio;
After step 9, current media business are transmitted, switch to other media service type such as need, then repeat said process.
2. the while as claimed in claim 1 is characterized in that according to the radio data transmission method of information source and channel variation adjustment parameter in the described step 1, QoS of survice parameter decision criterion is:
1, voice service: BER=10
-3Data rate=16Kbps; Maximum delay=30ms;
2, video traffic: BER=10
-4The Kbps of data rate=(16*N), N=1,2 ..., M, M are speed grade; Maximum delay=30ms;
3, data service: BER=10
-6The Kbps of data rate=(16*Nc), Nc is maximum available dedicated traffic channel number at that time; Maximum delay=do not limit.
3. the while as claimed in claim 1 is characterized in that according to the radio data transmission method of information source and channel variation adjustment parameter in the described step 2, the Dedicated Traffic Channel distribution principle is:
Voice service and data service send resource allocation request by Random Access Channel to base station BS;
Video traffic is then passed to BS with business data flow by Dedicated Traffic Channel with solicited message;
Base station BS is that each successful voice service request distributes a recently available Dedicated Traffic Channel, and the bit rate of deciding that carries out low rate transmits;
For video traffic, base station BS is its distribution according to solicited message or upgrades recently available Dedicated Traffic Channel group, realizes the variable bit rate parallel transmission of two-forty;
Disconnected data service allows base station BS to distribute all available farthest Dedicated Traffic Channels for it, finishes the Available Bit Rate transmission;
Regulation voice service and video traffic have the priority higher than data service, are not having can to deprive the Dedicated Traffic Channel of distributing to data service under the condition of enough idling-resources.
4. the while as claimed in claim 1 is adjusted the radio data transmission method of parameter according to information source and channel variation, it is characterized in that, in the described step 4, coding demodulator structure and decoding algorithm remain unchanged in all rate domain, only change code check and constellation size.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104780016A (en) * | 2014-01-10 | 2015-07-15 | 中国移动通信集团公司 | Data resource transmission method and data resource transmission equipment |
| CN106100787A (en) * | 2016-05-31 | 2016-11-09 | 上海第二工业大学 | Adjust the radio data transmission method of parameter according to information source and channel variation simultaneously |
| CN106303657A (en) * | 2016-08-18 | 2017-01-04 | 北京奇虎科技有限公司 | A kind of even method that wheat is live and main broadcaster's end equipment |
| CN107113429A (en) * | 2014-10-03 | 2017-08-29 | 微软技术许可有限责任公司 | The adaptive quantizing in interest region |
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2012
- 2012-03-27 CN CN 201210083233 patent/CN103369602A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104780016A (en) * | 2014-01-10 | 2015-07-15 | 中国移动通信集团公司 | Data resource transmission method and data resource transmission equipment |
| CN104780016B (en) * | 2014-01-10 | 2019-01-01 | 中国移动通信集团公司 | A kind of transmission method and equipment of data resource |
| CN107113429A (en) * | 2014-10-03 | 2017-08-29 | 微软技术许可有限责任公司 | The adaptive quantizing in interest region |
| CN106100787A (en) * | 2016-05-31 | 2016-11-09 | 上海第二工业大学 | Adjust the radio data transmission method of parameter according to information source and channel variation simultaneously |
| CN106303657A (en) * | 2016-08-18 | 2017-01-04 | 北京奇虎科技有限公司 | A kind of even method that wheat is live and main broadcaster's end equipment |
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