MJCET, Osmania University
In recent years governments, automobile manufacturers and academia are working together to develop vehicular ad hoc network (VANET) based communication technologies. In VANETs there are multiple channels i.e., control channel (CCH) and service channels (SCHS), to provide public road safety and other comforts while driving vehicle. The wireless medium for vehicular communication is prone to the problem of broadcast storm. This produces collisions (due to contention) and redundancy (due to rebroadcast) as manifests. A better insight into the working mechanism of the multi-channel operation is always of prior importance when devising routing algorithms for Vehicular Networks. This paper presents the relevant literature to discuss the multi-channel operation of 802.11p MAC. Based on standard draft IEEE 802.11p and IEEE 1609.4, this paper explores the working of multi-channel MAC schemes proposed in literature to gain better knowledge of the subject. The recent trends are based on providing resilient, collision tolerable mechanisms to enhance Vehicular Communications.