Multi-Hop Broadcasting in Vehicular Ad Hoc Networks with Shockwave Traffic

Abstract

Abstract-A primary goal of intelligent transportation systems (ITS) is to improve road safety. The ability for vehicles to communicate is a promising way to alleviate traffic accidents by reducing the response time associated with human reaction to nearby drivers. In addition the limitations of standard driving can be overcome by providing drivers with instantaneous information about complications up ahead. Shockwaves, induced by vehicle speed differentials, are a typical mobility pattern that occurs with the formation and propagation of vehicle queues. These induce sudden braking and increase the occurrence of traffic incidents. In this paper, we investigate safety applications in highways with shockwave mobility and different lane configurations in vehicular ad hoc networks (VANET). We evaluate the performance of multi-hop broadcast communication using the ns-2 simulator with vehicles following a shockwave mobility pattern in fully-connected traffic streams. We propose mechanism to improve broadcast reliability using dynamic transmission range that leverages our understanding of fundamental traffic flow relationships.

A Reliable and Efficient Highway Multihop Vehicular Broadcast Model

“…For scalable delivery, researchers have proposed georouting and further have focused on exploiting innate characteristics of vehicular networks such as high speed, but restricted, mobility. Recently, there have been many literatures for alleviating broadcast storms [10,11]. For example, urban multihop broadcast (UMB) [12] features a form of redundant flood suppression scheme where the furthest node in the broadcast direction from a sender is selected to forward and acknowledge the packet.…”

Information Dissemination Delay in Vehicle-to-Vehicle Communication Networks in a Traffic Stream

“…Both Ukkusuri and Du [13] and Jin and Recker [14] developed analytical formulations to predict multi-hop connectivity of inter-vehicle communication network assuming stationary traffic stream, but different mathematical models are used. Chen et al [15] evaluated the performance of multi-hop broadcast communication (information propagation distance, and throughput of information package to be received for a given distance) with vehicles following shockwave mobility pattern which mixes free flow and congested flow traffic. Wang et al [16] and Yin et al [17] estimated the expectation, variance and probability distribution of instantaneous information propagation distance assuming that vehicles' headway follows Gamma, Poisson, or Log-normal distribution.…”

Safety Information Dissemination Path Prediction in High-Density Vehicular Wireless Networks

“…And the performance of two metrics depends on the selected relay node and the transmitted path load [2,3]. For improving the metrics, some special multi-hop broadcast protocols has been proposed based on the road topology or pre-routing information from the vehicle path prediction [4,5]. However, for the tiny enhance of dissemination delay, the vehicle path prediction mainly has been applied to estimate the neighbor vehicle [6].…”