Mac for Physical-Layer Network Coding in VANETs

Authors:
Eugène David Ngangue Ndih;Soumaya Cherkaoui
Affiliations:
Department of Electrical and Computer Engineering, Université de Sherbrooke, Sherbrooke, QC, Canada;Department of Electrical and Computer Engineering, Université de Sherbrooke, Sherbrooke, QC, Canada
Venue:
International Journal of Business Data Communications and Networking
Year:
2012

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Abstract

In this paper, the authors present VPNC-MAC, a PNC-based MAC protocol for efficient and reliable periodic beacon broadcasts in VANETs. In addition to PNC-based scheduled transmissions, VPNC-MAC makes use of CSMA/CA to ensure fairness and flexibility with transmissions from CSMA-based nodes. VPNC-MAC consists of two phases: In the setup phase, a quasi-optimal mechanism of selecting a relay node is proposed to take into account both the position, and the remaining time the relay needs for delivering its current beacon. In the packet exchange phase, they define two priority modes to deal with the cohabitation of both the CSMA-based and the VPNC-based nodes, and also with unpredictable events such as emergency broadcasts. Contrary to the high-priority mode, the VPNC-based nodes AIFS in the low-priority mode is set such that the medium access is granted prior to CSMA-based nodes. Simulations results show that the global PRR in high-priority mode outperforms existing MAC.