This brief examines recent developments in the Heterogeneous
Vehicular NETworks (HETVNETs), integrating cellular networks with
Dedicated Short-Range Communication (DSRC) for meeting the
communications requirements of the Intelligent Transport System
(ITS)services. Along with a review of recent literature, a unified
framework of the HetVNET is presented. The brief focuses on
introducing efficient MAC mechanisms for vehicular communications,
including channel access protocols, broadcast/multicast protocols,
the location-based channel congestion control scheme and the
content-based resource allocation scheme. The cooperative
communication between vehicles is discussed. This brief concludes
with a discussion on future research directions, and provides the
readers with useful insights into the future designs in the
HetVNETs, to motivate new ideas for performance improvements in
vehicular networks.
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