CMMP: Clustering-Based Multi-channel MAC Protocol in VANET

In VANET, the researches based on the wireless LAN are conducting and the method based on 802.11a is being adapted in IEEE 802.11p WAVE (wireless access in vehicular environments). However, wireless LAN which uses a single channel in a competition can cause transmission delays because of a frequent collision and a use of CSMA/CA(carrier sense multiple access/collision avoidance) VANET(vehicle ad hoc network) requiring a fast access. In this paper, we designed clustering-based multi-channel MAC(media access control) protocol adequate to VANET and then confirmed the appropriate channel conditions in a V2V(vehicle to vehicle) communication on the basis of this protocol. The simulation results showed that a packet collision and a transmission delay by the use of an existing single channel based on the contention decreased more than 60% by making cluster head assign and manage each channel.