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The transmission of safety/update message aims to inform the nearby vehicles about the senders current status and/or a detected dangerous situation. This type of transmission is designed to help in accident and danger avoidance. Moreover, it requires high message generated rate and high reliability. On the other hand, the transmission of non-safety message aims to increase the comfort on vehicles by supporting several non-safety services, from notifications of traffic conditions to file sharing. Unfortunately, the transmission of non-safety message has less priority than safety messages, which may cause shutting down the comfort services. The goal of this paper is to design a MAC protocol in order to provide the ability of the transmission of nonsafety message with little impact on the reliability of transmitting safety message even if the traffic and communication densities are high in a multi-hop cluster. Our protocol is based on modifying TC-MAC which uses TDMA technique for slot reservation based on clustering of vehicles.

Abstract-Vehicular Ad Hoc Networks (VANETs) are a form of Mobile Ad Hoc Networks (MANETs) in which vehicles on the road form the nodes of the network. VANETs provide several services to enhance the safety and comfort drivers and passengers. One of the services that VANETs can provide is file sharing between vehicles. Sharing large scale files through the network is a challenging task. Therefore, developing an efficient peer-to-peer (P2P) file sharing scheme is important. This paper presents a P2P file sharing scheme for VANETs using TC-MAC, a MAC algorithm for vehicular ad-hoc networks using Time-Division Multiple Access (TDMA) slot reservation based on clustering of vehicles. Using TDMA will reduce collisions and packet drops in the channel, as well as provide fairness in sharing the wireless medium and minimizing the effect of hidden terminals. Our work aims to develop a P2P file sharing algorithm to improve the file downloading time between neighbouring vehicles.

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