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Sensors 2017, 17(2), 338;

Synthesizing Existing CSMA and TDMA Based MAC Protocols for VANETs

School of Information Science and Engineering, Central South University, Changsha 410083, China
School of Computer, Electronics and Information, Guangxi University, Nanning 530004, China
Author to whom correspondence should be addressed.
Academic Editor: Paolo Bellavista
Received: 18 December 2016 / Revised: 29 January 2017 / Accepted: 6 February 2017 / Published: 10 February 2017
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Many Carrier Sense Multiple Access (CSMA) and Time Division Multiple Access (TDMA) based medium access control (MAC) protocols for vehicular ad hoc networks (VANETs) have been proposed recently. Contrary to the common perception that they are competitors, we argue that the underlying strategies used in these MAC protocols are complementary. Based on this insight, we design CTMAC, a MAC protocol that synthesizes existing strategies; namely, random accessing channel (used in CSMA-style protocols) and arbitral reserving channel (used in TDMA-based protocols). CTMAC swiftly changes its strategy according to the vehicle density, and its performance is better than the state-of-the-art protocols. We evaluate CTMAC using at-scale simulations. Our results show that CTMAC reduces the channel completion time and increases the network goodput by 45% for a wide range of application workloads and network settings. View Full-Text

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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 (CC BY 4.0).

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Huang, J.; Li, Q.; Zhong, S.; Liu, L.; Zhong, P.; Wang, J.; Ye, J. Synthesizing Existing CSMA and TDMA Based MAC Protocols for VANETs. Sensors 2017, 17, 338.

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