Comparative Study of TDMA-Based MAC Protocols in VANET: A Mirror Review

Abstract

In recent years, Vehicular ad hoc networks emerge as the promising applications of Mobile ad hoc network. It is specially designed for road safety and comforts to people. It assists vehicles to communicate among themselves and to perceive the road situation such as accidents or traffic jams in their vicinity. This goal can be achieved by using safety applications which can broadcast the warning messages wirelessly between neighboring vehicles informing drivers of any dangerous situation nearby. Vehicles use transmission channels, which is shared medium and neighboring nodes are not allowed to transmit simultaneously because a transmission collision may occur. Therefore, Medium Access Control (MAC) protocols are required to proficiently share the medium and dependable conveyance of messages. Sharing the medium efficiently in VANET is a difficult task due to the special characteristics like high node mobility, frequently changing topology, etc. Various Time Division Multiple Access (TDMA) based MAC protocols have been proposed as it provides bounded delay with less packet loss ratio than other multiple access schemes and experiences no interference from concurrent transmission. In this paper, the comparative analysis of different classification of TDMA-based protocols has presented. The protocols are compared on the basis of different performance metrics such as access collision, merging collision, synchronization, safety services, scalability, etc. Some of the execution measurements are highlighted in the introduction section. In addition to, comparative analysis their design issues, advantages and drawbacks are also discussed.