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Protocol Of Traffic Dataacquirement And Dynamic Path Planning Via Vanet

Posted on:2018-09-05Degree:MasterType:Thesis
Country:ChinaCandidate:S W WuFull Text:PDF
GTID:2348330536952539Subject:Information and Communication Engineering
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Intelligent management of urban transportation has always been a crucial part in modernization of our country.With the rapid development,the contradiction between the limited road resources and increasing number of vehicles becomes more and more prominent.Traffic status monitoring and path planning for vehicles are two main parts of Intelligent Traffic System(ITS),which are also the focus of this thesis.Based on the the architecture of the promising network VANET,vehicular ad-hoc network,the thesis works on a routing protocol for the acquirement of traffic status data and the corresponding routing protocol.Besides,a dynamic path planning algorithm is proposed to help the drivers bypass the congestion timely.First,we propose a protocol aiming at acquiring traffic status data of fixed road links.After a source vehicle works out,it should monitor its traffic status.So ID of wanted road links,which is the initial path,should be added to the RREQ when the source vehicle sends it out.Then only the vehicles running on the wanted road links will reply to the source and pass the traffic data back,which will save the resources and throughput of the entire network.The whole process is achieved by an enhanced AODV routing protocol,which is based on the geographic location to accelerate the data propagation between relay vehicles.In the second part,a dynamic path planning method is explained.It is a recursive revision process.When a possible congestion is predicted by source vehicle,this algorithm can help revise the initial path to bypass the congestion.After acquiring the traffic status data,a prediction model is used to predict the status variation,and the source vehicle only re-plans the congested parts.In addition,we further put forward a time comparison mechanism,which aims at making decision for the source vehicle of whether to stay and wait for the congestion resume or take the alternative path to bypass the congestion by comparing the the time consumption.Software and numerical simulation is conduced for the above two parts to illustrate the superiority of improved AODV routing protocol in packet delivery time and delay.Remaining problems and future work is presented to conclude the thesis.
Keywords/Search Tags:VANET, data acquirement, geographical routing, AODV routing protocol, dynamic path planning, revision-based mechanism
PDF Full Text Request
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