Abstract
Safety related VANET messages have localized spatial scope and limited time relevance. A MAC protocol should exploit the unique VANET characteristics like restricted mobility in one dimensional motion paths, presence of RSU, limited transmission range of vehicles and large transmission range of RSU to ensure timely and reliable delivery of messages. In this paper, an RSU assisted TDMA protocol has been proposed to minimize channel allocation time and management overhead. The problems are the limited bandwidth, shared wireless medium, high mobility of vehicles etc. For this, the RSU divides the limited bandwidth allocated to its region into prefixed overlapping spatial clusters and the channel in each cluster is divided into time slots. A time slot is allotted to a vehicle in accordance to the priority of the request and availability of the channel. Simulation results indicate that the allocation scheme is able to deliver packets within the stipulated time with high reliability for different vehicle speeds and density for channel allocation based on three overlapping clusters. Moreover, TDMA based MAC with contention based request increases the packet reception ratio along with low in channel acquisition delay.
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Tomar, R.S., Verma, S., Tomar, G.S. (2013). Cluster Based RSU Centric Channel Access for VANETs. In: Gavrilova, M.L., Tan, C.J.K. (eds) Transactions on Computational Science XVII. Lecture Notes in Computer Science, vol 7420. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35840-1_8
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DOI: https://doi.org/10.1007/978-3-642-35840-1_8
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