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International Journal of Distributed Sensor Networks
Volume 2013 (2013), Article ID 932673, 14 pages
http://dx.doi.org/10.1155/2013/932673
Research Article

A Proximity-Based Concurrent Access Strategy to Improve Throughput in VANETs

1State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China
2CCCC First Highway Consultants Co. Ltd., Xi’an 710075, China
3Guilin University of Electronic Technology, Guilin 541004, China

Received 12 April 2013; Accepted 17 June 2013

Academic Editor: Shukui Zhang

Copyright © 2013 Chen Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Intervehicle communication gives vehicles opportunities to exchange packets within limited transmission ranges and self-organize with ad hoc manner into VANETs (vehicular ad hoc networks). However, due to shared spectrum and present collisions' resolution mechanism which reject new admissions when wireless medium is busy, communications between vehicles have experienced severe throughput degradation and been restrained for concurrent transmissions. In this paper, a PCM (proximity-based concurrent transmission MAC) protocol has been proposed to permit concurrent access in shared channel for improving goodput in VANETs. By introducing game theory to the concurrent transmission opportunities determination process, PCM could provide extra access chances between active nodes or vehicles based on our defined proximity. To make PCM practical, we further give a detailed implementation method on NS2 to evaluate its performance. Numerical results show that PCM is not only feasible and reasonable in theory, but also has great improvement on average transmission delay, delivery ratio, and throughput performance in test.