CN103237358B - A kind of for joining with the GPRS network access optimization method of telecommunication - Google Patents
A kind of for joining with the GPRS network access optimization method of telecommunication Download PDFInfo
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Abstract
The present invention relates to a kind of for joining with the GPRS network access optimization method of telecommunication, GPRS adopts network system S-ALOHA mode to carry out Stochastic accessing, user sends Stochastic accessing application on a random access channel, network side is by the state of statistics Stochastic accessing channel, the user of statistics network break-in side sends the probability of success of access application, the idle probability of Stochastic accessing channel and busy probability, estimate the load of current Stochastic accessing channel, thus calculate user and initiate the optimum probability accessing application, optimize the random access procedure of GPRS network. Compared with prior art, the present invention can solve the problem of network Stochastic accessing inefficiency in high load situations, and the regulation mechanism by a kind of simple possible, it is achieved terminal access is controlled.
Description
Technical field
The present invention relates to a kind of GPRS network cut-in method, especially relate to a kind of for joining with the GPRS network access optimization method of telecommunication.
Background technology
Intelligent grid is the new advancement that world today's power system development is changed, it sends out to comprise, defeated, become, join, with and the power system of each link such as scheduling into object, constantly research and development and application Novel control technology, information technology and administrative skill, it is achieved the intelligent AC of information. Communication Information System is as supporting common platform and the important means that intelligent grid is built, all the time through six big applied links, the basis implementing distribution automation, though to be realized data and order, transmit and all be unable to do without reliable and stable communication system and support fast.
Power communication network develops into works as the last stage, and overall architecture take fiber optic network as backbone network, and EPON, PLC, wireless communication networks are connecting network. The wireless public network technology mainly GPRS technology that current domestic electrical network uses. Due to gprs system finite capacity, there is the problem in access in carrying intelligent grid business. When much joining, electric terminal when same, be carved with data when sending net power system platform, network is congested by there will be certain access, causes network performance extremely to worsen, even paralyses, it is thus desirable to the access of terminal is carried out certain control and management, improve the performance of network.
The Stochastic accessing of GPRS network have employed CDMA slotted ALOHA (S-ALOHA) method, the method is a kind of random access scheme based on competition, its complexity is low, it is easy to realize, when load is low time, performance is good, and when load is very big, the performance of algorithm sharply declines, the collision probability of access signal is very big, and performance sharply worsens.
Document " OverloadControlMethodforSynchronizedMTCtrafficinGERAN " (VehicularTechnologyConference (VTCFall), 2011IEEE, pp1-5, Sept2011.) a kind of self-adapting load S-ALOHA cut-in method is proposed, by base station to the monitoring of Stochastic accessing channel, add up the quantity of idle channel in observing time, the Stochastic accessing application sending probability of the change user terminal of self-adaptation, reduce the load of connecting network side, make the maximum throughput keeping network when load is higher.
Document " ACentalizedDynamicAccessProbabilityProtocalforNextGenera tionWirelessNetwork " (IEEEINFOCOM2001, pp.767-775.) business initiated according to some periodic synchronous of terminal user has carried out resource and has reserved, in user's first time access network process, time delay is bigger, after user access network, namely to the Radio Resource of base station application access next time, when the 2nd business initiates cycle arrival, without the need to application access, as long as the control command monitoring base station can complete access.
The main drawback of prior art have following some:
1. although slotted ALOHA scheme realizes simple, but performance is very poor when network load is higher, the intelligent grid more for terminal quantity is joined, electricity consumption communications net, and in service set reports cycle time section, network performance will sharply worsen.
2. the S-ALOHA method of self-adapting load needs to obtain the condition of loading of current network according to the idle channel of Stochastic accessing channel (time gap) number, when the algorithm for estimating of network without system during idle channel cannot work, the performance of network will significantly reduce.
3. the random access problems of consecutive periods business can be more effectively solved for the resource reservation algorithm of periodic traffic, the access time of first cycle user is longer, and user needs the resource used when sending data every time to the next transmission of base station reservation, ensures not enough for sudden business; Base station needs for each subscriber channel reservation resource, it is necessary to consume big storage capacity and more complicated scheduling algorithm, it is achieved cost is higher.
Summary of the invention
The object of the present invention is exactly the defect in order to overcome the existence of above-mentioned prior art and provides a kind of for joining with the GPRS network access optimization method of telecommunication, the method can solve the problem of network Stochastic accessing inefficiency in high load situations, and by the regulation mechanism of a kind of simple possible, it is achieved terminal access is controlled.
The object of the present invention can be achieved through the following technical solutions:
A kind of for joining with the GPRS network access optimization method of telecommunication, GPRS network system adopts S-ALOHA mode to carry out Stochastic accessing, user sends Stochastic accessing application on a random access channel, it is characterized in that, network side is by the state of statistics Stochastic accessing channel, the user of statistics network break-in side sends the probability of success of access application, the idle probability of Stochastic accessing channel and busy probability, estimate the load of current Stochastic accessing channel, thus calculate user and initiate the optimum probability accessing application, optimize the random access procedure of GPRS network.
This optimization method specifically comprises the following steps:
1) state of Stochastic accessing channel is monitored in base station in each monitoring periods, the probability of this channel idleAnd the probability that user successfully accessesWherein, nemptyT () is free timeslot number, nsuccT () is the time gap number successfully transmitted;
2) according to step 1) in the Stochastic accessing channel idle that obtains and the probability that successfully accesses of user, estimate the charge capacity of this Stochastic accessing channel serviceThe t that r (t) is estimation sends the number of users of Stochastic accessing application, when having and only a user sends Stochastic accessing application a moment so that the sending probability of user's Stochastic accessing application
3) according to the state of Stochastic accessing channel, the sending probability of user's Stochastic accessing application is revised further.
Step 3) if in when currently there is no an idle Stochastic accessing channel, judge the sending probability p of user's Stochastic accessing applicationaccessWhether being greater than 0.8, if being greater than 0.8, then keeping the sending probability of user's Stochastic accessing application constant, if being not more than 0.8, then carrying out it adjusting as follows: paccess(t)=paccess(t-1)/e0.5;
If Stochastic accessing channel is completely idle, then carry out adjusting as follows to the sending probability of user's Stochastic accessing application: paccess(t)=paccess(t-1)��e0.5��
Compared with prior art, the present invention, by the condition of loading of estimation network, calculates user's access probability that Stochastic accessing channel utilization of sening as an envoy to is the highest, thus controls the access of user in subsequent time period. The method join with telecommunication equivalent time initiate the very big scene of the customer volume of business under very effective, it is possible to significantly improving the access probability of success of user, reduce the access time delay of user, its technological merit is as follows:
1. simple, only according to the RACH channel state of base station statistics, and can need to adjust the length of monitoring periods as required, simple possible, successful.
2. utilize present method can reach the access of the well a large amount of sudden customer service of control, the pressure that network is brought by reduction business point peak, it is to increase the performance of connecting network, it is to increase the reliability of power distribution communication network.
Accompanying drawing explanation
Fig. 1 is the comparison diagram adopting the present invention and existing access way.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
A kind of for joining with the GPRS network access optimization method of telecommunication, GPRS network system adopts S-ALOHA mode to carry out Stochastic accessing, user sends Stochastic accessing application on a random access channel, it is characterized in that, network side is by the state of statistics Stochastic accessing channel, the user of statistics network break-in side sends the probability of success of access application, the idle probability of Stochastic accessing channel and busy probability, estimate the load of current Stochastic accessing channel, thus calculate user and initiate the optimum probability accessing application, reach the object of the random access procedure optimizing GPRS network.
This optimization method specifically comprises the following steps:
Step 1: the state of Stochastic accessing channel is monitored in base station in each monitoring periods, the probability of this channel idleAnd the probability that user successfully accessesWherein, nemptyT () is free timeslot number, nsuccT () is the time gap number successfully transmitted;
Step 2: in communication model, the arrival rate of user is assumed to be Poisson's distribution, here according to the characteristic of Poisson's distribution and integrating step 1) in the probability that successfully accesses of the Stochastic accessing channel idle that obtains and user, estimate the charge capacity of this Stochastic accessing channel serviceThe t that r (t) is estimation sends the number of users of Stochastic accessing application, and when having and only a user sends Stochastic accessing application a moment, user can successfully access, when t, it may also be useful to the sending probability of family Stochastic accessing applicationThe probability now only having a user to initiate Stochastic accessing application is maximum.
Step 3: because distribution user terminal quantity is big especially, when user initiates business within the short period of time simultaneously, may not have the channel that idle channel and success are transmitted in network. And within the communication cycle, the initiation of customer service is not exclusively Poisson's distribution, system performance reduces, it is thus desirable to revised further by the sending probability of user's Stochastic accessing application.
If when a) currently there is no an idle Stochastic accessing channel, representing that in network, user load is very big, carrying out Stochastic accessing success ratio and can infer current p according to useraccessWhether reasonable, if therefore paccess> 0.8, then keep the sending probability of user's Stochastic accessing application constant, otherwise carries out it adjusting as follows: paccess(t)=paccess(t-1)/e0.5;
If b) Stochastic accessing channel is completely idle, then the access application not having user is described, then carries out adjusting as follows to the sending probability of user's Stochastic accessing application: paccess(t)=paccess(t-1)��e0.5��
P all should be ensured carrying out above stepaccessT () is no more than 1.
When adopting the method for the present invention to carry out network insertion optimization, the performance of GPRS network under different user condition of loading is as shown in Figure 1. When it is 100 to 1000 that this figure has showed bursty user quantity (in 1 second), the access performance performance of system, it can be seen that when number of users constantly increases, the present invention has optimum performance.
Claims (2)
1. one kind is accessed optimization method for joining with the GPRS network of telecommunication, GPRS adopts network system S-ALOHA mode to carry out Stochastic accessing, user sends Stochastic accessing application on a random access channel, it is characterized in that, network side is by the state of statistics Stochastic accessing channel, the user of statistics network break-in side sends the probability of success of access application, and the idle probability of Stochastic accessing channel, estimate the load of current Stochastic accessing channel, thus calculate user and initiate the optimum probability accessing application, optimize the random access procedure of GPRS network;
This optimization method specifically comprises the following steps:
1) state of Stochastic accessing channel is monitored in base station in each monitoring periods, the probability of this channel idleAnd the probability that user successfully accessesWherein, nemptyT () is free timeslot number, nsuccT () is the time gap number successfully transmitted, �� represents the time span of monitoring periods;
2) according to step 1) in the Stochastic accessing channel idle that obtains and the probability that successfully accesses of user, estimate the charge capacity of this Stochastic accessing channel serviceThe t that r (t) is estimation sends the number of users of Stochastic accessing application, when having and only a user sends Stochastic accessing application a moment so that the sending probability of user's Stochastic accessing application
3) according to the state of Stochastic accessing channel, the sending probability of user's Stochastic accessing application is revised further.
2. according to claim 1 a kind of for joining with the GPRS network of telecommunication access optimization method, it is characterised in that, step 3) if in when currently there is no an idle Stochastic accessing channel, judge the sending probability p of user's Stochastic accessing applicationaccessWhether being greater than 0.8, if being greater than 0.8, then keeping the sending probability of user's Stochastic accessing application constant, if being not more than 0.8, then carrying out it adjusting as follows: paccess(t)=paccess(t-1)/e0.5;
If Stochastic accessing channel is completely idle, then carry out adjusting as follows to the sending probability of user's Stochastic accessing application: paccess(t)=paccess(t-1)��e0.5��
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| CN110278598B (en) * | 2019-06-20 | 2020-11-10 | 北京邮电大学 | Wireless access method, electronic device and readable storage medium |
| CN110535525A (en) * | 2019-09-20 | 2019-12-03 | 深圳市天海世界卫星通信科技有限公司 | Data download method, device, storage medium and system based on satellite network |
| CN113098744B (en) * | 2019-12-23 | 2022-12-27 | 北京神经元网络技术有限公司 | User node discovery method and device, electronic equipment and storage medium |
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| CN102148675A (en) * | 2011-05-06 | 2011-08-10 | 北京邮电大学 | Random access protocol based on hybrid automatic retransmission |
| CN102573006A (en) * | 2011-11-25 | 2012-07-11 | 西安电子科技大学 | Machine-to-machine (M2M) access control method for long term evolution (LTE) |
| WO2012148363A1 (en) * | 2011-04-29 | 2012-11-01 | National Science And Technology Development Agency | Rfid sigulation process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012148363A1 (en) * | 2011-04-29 | 2012-11-01 | National Science And Technology Development Agency | Rfid sigulation process |
| CN102148675A (en) * | 2011-05-06 | 2011-08-10 | 北京邮电大学 | Random access protocol based on hybrid automatic retransmission |
| CN102573006A (en) * | 2011-11-25 | 2012-07-11 | 西安电子科技大学 | Machine-to-machine (M2M) access control method for long term evolution (LTE) |
Non-Patent Citations (1)
| Title |
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| Fast Adaptive S-ALOHA Scheme for Event-driven Machine-to-Machine Communications;Huasen Wu等;《Vehicular Technology Conference（VTC Fall），2012 IEEE》;20120906;第1-2章 * |
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