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Research On Connectivity-Oriented VANET Routing Protocol In Urban Scenarios

Posted on:2013-01-28Degree:MasterType:Thesis
Country:ChinaCandidate:H J ShiFull Text:PDF
GTID:2248330377960919Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
With the rapid development of automobile electronic technologies and information industry, traditional wired networks are unable to meet the communication requirements of anytime and anywhere. In the mean time many new wireless network technologies have emerged recently. Vehicular Ad hoc Network (VANET) is a novel wireless network which can make people’s life more convenient. VANET is established as an efficient inter-vehicle communication platform. It mainly uses several kinds of methods synthetically, such as modern information technology, computer networks, communications and signal processing, to collect, process, analysis and disseminate the packets.Intermittent connectivity problem is a key factor to implement and popularize VANET. A reasonable solution of metro connectivity is to establish an opened and none operator communications network which can seamlessly assess to GPRS/Internet. Based on the features and connectivity guarantee mechanism of existing VANET routing protocols, an intersection dispatch-based VANET routing protocol (IDVR) is proposed in this paper. The routing strategy provides Far-reaching Detection Method (FDM) and Parked vehicles Forwarding Mechanism (PFM) to calculate the optimal connectivity path to enhance the network performance. The main work is as follows:1、We have an in-depth study of Ad hoc networks and VANET network. Advantages and disadvantages, working mechanism and application scenarios of existing Ad hoc networks and classic VANET routing protocols are analyzed and compared. We also give the general evaluation standard of routing protocols. Physical connectivity and logical connectivity are used to illustrate the connectivity guarantee mechanisms.2、Due to low efficiency transportation caused by the poor connectivity of metropolitan area, we propose a protocol based on the angle priority geographical position VANET routing protocols(IDVR) improved from GPSR. We introduce a fixed node in each intersection which increases effective forwarding nodes connectivity and availability of branches.3、We use the microscopic traffic simulation software-VanetMobi Sim to produce mobile topology files in urban scenarios and put the files into NS2to simulate proposed protocol. The simulation results show that IDVR protocol has better performance than AODV and GPSR in urban scenarios when the average speed is less than40km/h.4、Urban vehicles have a feature of long parking time, according to the characteristic we add the concept of PFM to our strategy. Parked nodes, fixed node and mobile nodes are adopted to complete the data receiving, broadcasting and forwarding processes. Finally, experimental results show that IDVR with parked nodes has better performance in average end-end delay, normalized routing load and packet delivery ratio.
Keywords/Search Tags:Ad hoc networks, VANET, IDVR, routing protocols, parked vehicle node, urban scenarios
PDF Full Text Request
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