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03-08-2017 | Issue 3/2017

Wireless Personal Communications 3/2017

A Hybrid Approach to Analyze the Impact of Vehicular Traffic on Performance of 802.11p Protocol for Safety Communications in Vehicular Ad Hoc Networks: A Quantitative Analysis

Journal:
Wireless Personal Communications > Issue 3/2017
Authors:
Seyyed Amir Ali Ghafourian Ghahramani, Ali Mohammad Afshin Hemmatyar

Abstract

The rapid developments in wireless communications have introduced the vehicular ad hoc networks as an efficient tool to improve the safety of traffic through Dedicated Short Range Communications systems on highways. This paper addresses the broadcast mode of the 802.11p protocol and it quantitatively analyzes the impact of the highway vehicular traffic on its performance in terms of the packet delivery ratio and the packet transmission delay. To this aim, we propose to consider the number of the contending vehicles as a traffic-dependent stochastic counting process, which can be computed by analyzing the inter-vehicle spacing distribution in different traffic conditions. Based on the empirical data, the Lognormal and the Generalized Extreme Value distributions have been chosen to represent the inter-vehicle spacing distribution for a highway scenario in the semi-sparse and the intermediate traffic, respectively. The renewal theory is applied to the inter-vehicle spacing distribution to compute the traffic-dependent counting processes for each traffic condition. Through combination of the resulting counting processes with the performance analysis of the protocol, we propose a hybrid method that can be used to compute the upper bound, the lower bound, and the dominant bound and the probability of reaching to these bounds for desired performance metrics. As a result, the deviation of performance metrics from their average values is analyzed for each traffic condition. Our evaluations show that the accuracy of the proposed hybrid approach is consistent with the empirical results.

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