No abstract

This paper presents the URBAN XOR 1 protocol, an XOR-based flat routing mechanism developed for vehicular ad hoc networks (VANETs) formed in urban scenarios. The paper firstly describes the URBAN XOR routing principle, which requires reduced knowledge about the set of nodes present in the VANET in order to provide traffic forwarding. Basically, the URBAN XOR protocol introduces the concept of local visibility, prioritizing the insertion of closer neighbors (in number of hops) in the routing tables, and simplifying the management of the frequent network mobility found in VANETs. Then, the performance of the proposed URBAN XOR protocol is compared through simulation with other topology-based and position-based protocols, characterizing its performance in terms of path availability ratio, end-to-end delay, path length and path duration. The results reveal that URBAN XOR contributes for the overall network stability, reducing the end-to-end delay due to its ability of generating shorter paths. At the same time, URBAN XOR exhibits path availability similar to other topologybased protocols, but exhibiting better path duration times.

ABSTRACT

A Vehicular Ad Hoc Network (VANET) is a network formed purely among vehicles without presence of anycommunication infrastructure as base stations and/or access point. Frequent topological changes due tohigh mobility is one of the main issues in VANETs. In this paper we evaluate Ad-hoc On-Demand DistanceVector (AODV) and Optimized Link State Routing (OLSR) routing protocols using 802.11a and 802.11p ina realistic urban scenario. For this comparison, we chose five performance metrics: Path Availability, Endto-End Delay, Number of Created Paths, Path Length and Path Duration. Simulation results show, that formost of the metrics evaluated, OLSR outperforms AODV when 802.11p and that 802.11p is more efficientin urban VANETs

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