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This paper proposes a novel distributed asynchronous multi-channel MAC scheme for large-scale Vehicular Ad Hoc Networks, namely, Asynchronous Multi-Channel MAC-Distributed (AMCMAC-D). The proposed scheme supports simultaneous transmissions on different service channels, while allowing rendezvous and broadcast of emergency messages on the control channel. The scheme is distributed, in the sense that it handles access to the shared control channel for different access categories without relying on the beacon frames from roadside units. This eliminates the overhead associated with channel allocation making the proposed scheme suitable for large-scale networks in terms of the number of active nodes.
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