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Vehicular Ad-Hoc Network (VANET) is an emerging wireless technologies brought by the latest advances in mobile communication. It is now gaining attention and momentum in the automobile industry. Vehicles need to equip with wireless transceivers and control modules to communicate with each other. A range of few hundred meters is the limited range up to which the vehicle can communicate with other vehicles. Therefore, the messages hop using several nodes in order to provide end-to-end communication across huge distances. To transfer messages between the nodes, efficient and reliable dispatch of packets is required. In addition to reliable delivery, messages should be exchanged without any collision. These challenges can be satisfied with fair, reliable and highly efficient Medium Access Control (MAC) protocols. It is difficult to implement the medium control protocols in VANET environment due to mobility of nodes at very high level. It is important to allocate the time-slots between vehicles in case of these protocols. Arbitrating the access of wireless channels is the major objective of MAC protocol. A channel assignment policy scheme is proposed which improves performance of the network as well as reduces the increased collision in the network. The proposed scheme is executed in NS2 and outcomes are analyzed with respect to certain criterion. It is evaluated that proposed procedure performs better than other parameters when

Improve the Quality of Service in Time Division Multiple Access based Vehicular Ad Hoc Network