Abstract
Previous work on the performance analysis of IEEE 802.11p beaconing protocol has paid little attention to the varying number of contending nodes and the restricted channel access: Since each node is allowed to broadcast only one beacon frame per control channel (CCH), the number of contending nodes decreases as the CCH elapses. Thus, the performance of 802.11p MAC protocol varies with the number of contending nodes, and the expiration of CCH may cause the beacon messages to drop. In this paper, we propose a new mathematical model to analyze the performance of 802.11p MAC, which considers both the effects of changing number of contending nodes and the restricted channel access. Based on the analytic results, a random contention window scheme is proposed. Through conducting extensive simulations, we verify that the proposed scheme considerably outperforms the legacy 802.11p protocol.
Highlights
Dedicated short-range communication (DSRC) is considered as one of the most crucial technologies for intelligent transportation systems (ITS)
6 Conclusion In this work, we have proposed a new analytic model to investigate the performance of 802.11p media access control (MAC) protocol on beaconing, especially regarding the effects caused both by varying numbers of contending nodes and by the restricted channel access
Based on the result of the analytic modeling, we presented a random contention window scheme to enhance the performance of 802.11p
Summary
Dedicated short-range communication (DSRC) is considered as one of the most crucial technologies for intelligent transportation systems (ITS). Our contributions are as follows: (1) A mathematical model considering the effects caused both by channel expiration and varying numbers of contending nodes is built Based on this new model, the time slots where CCH expiration occurs are counted. The previous models suggested for analyzing the 802.11p beaconing have paid little attention to the varying number of contending nodes [13, 14, 21], and the restricted channel access of CCH [15, 16], or investigated them separately [17]. Since the 802.11p MAC protocol is a contention-based scheme, the joint effect of the varying number of contending nodes and the restricted channel access may lead the network to perform quite differently. It is important to adopt a proper size of contention window in order to enhance the reliability of the 802.11p beaconing
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