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Intelligent Vehicular Networks

TitleIntelligent Vehicular Networks
Publication TypeThesis
Year of Publication2010
AuthorsFonseca, A
UniversityInstituto Superior Tecnico
CityOeiras
Thesis TypephdMasters Thesis
KeywordsMAC, routing, vehicular ad-hoc networks
Abstract

Several existing projects in the area of vehicular networks are based on the use of heteroge- neous networks and new protocol stacks, being expensive and hard to deploy. In this thesis I propose a an All-IP infra-structured Vehicular Ad-hoc NETwork (VANET) architecture where the access is entirely supported on WiFi access. To support my proposal, in this work, I started by evaluating the type of scenarios, considering both highway and urban environment, as well as the network architectures. Routing and medium access protocols are key issues of a network and therefor, a survey of the most relevant research work on both fields is of prime interest. According to my analysis, one of the routing protocols is adequate for my solution whilst none of the medium access protocol is because higher priority must be given to the Access Points when accessing the wireless medium. Thus, l propose a VANET architecture that uses an existing routing protocol and a modified version of 802.11 Medium Access Control (MAC) in which the access points have an higher priority. The proposal was implemented in the ns-2 network simulator. A set of tests using a Manhattan street network in an highly dense vehicular configuration were realized considering CBR, TCP, a mixed of both traffic types and voice traffic. To validate our performance two main metrics are considered: the Packet Delivery Ratio of Constant Bit Rate traffic and the Through- put of TCP protocol. The results achieved by my proposal have shown that it outperforms the use of standard MAC, when the packet delivery ratio and throughput are considered.