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A graph-based performance analysis of the 802.11p MAC protocol for safety communications in highway vehicular ad hoc networks
, Article Computer Journal ; Volume 60, Issue 2 , 2017 , Pages 185-209 ; 00104620 (ISSN) ; Hemmatyar, A. M. A ; Sharif University of Technology
Oxford University Press
2017
Abstract
We address the performance of the 802.11p protocol in terms of the packet delivery ratio (PDR) and the packet reception ratio (PRR) for broadcasting safety messages in highway environments. Regarding the semi-sparse and intermediate traffic, we try to answer to questions such as what are the upper, dominant and lower bounds of PDR and PRR in each traffic condition? How they may deviate from their average values? and What fraction of vehicles may experience such bounds? To answer to such questions, we propose to consider the communication graph formed among vehicles as a special type of the complex networks and we apply the recently proposed obligatory attachment ruleto synthesize such...
Analysis and Performance Enhancement of MAC Layer Protocols in Vehicular Ad Hoc Networks
, Ph.D. Dissertation Sharif University of Technology ; Afshin Hemmatyar, Ali Mohammad (Supervisor)
Abstract
The Intelligent Transportation Systems (ITS) are aimed to provide innovative services to improve safety of the traffic and make the use of the transport networks more coordinated. Such services are implemented by establishing wireless communications among the vehicles. The resulting mobile ad hoc network formed among the moving vehicles is called the Vehicular Ad Hoc Network (VANET). The IEEE 802.11p has been emerged as the first standardized contention-based MAC protocol for VANETs. The overall performance of the contention-based MAC protocols is directly dependent on the number of the contending nodes . To analyze the performance of the 802.11p protocol, most of the existing approaches...