Opportunistic Transmission Scheduling Using Medium Access Control Protocol
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 5
Abstract
Mobile underwater networks with acoustic communications are confronted with several unique challenges such as long propagation delay, high transmission power utilization, and node mobility. Propose the delay-aware opportunistic transmission scheduling (DOTS) algorithm designed for underwater mobile sensor networks. It uses passively obtained local information to increase the chances of concurrent transmissions while reducing the likelihood of collisions. Propose a simple performance enhancement mechanism that permits multiple outstanding packets at the sender side enabling multiple transmission sessions significantly improves the overall throughput. Proposed a MAC protocol called DOTS that alleviates limitations caused by the long propagation latency and the severely limited bandwidth of acoustic communications. DOTS can effectively exploit temporal and spatial reuse by using local information. In DOTS, each node learns neighboring nodes’ propagation delay information and their expected transmission schedules by passively overhearing packet transmissions. DOTS aimed to achieve better channel utilization by harnessing both temporal and spatial reuse. Our simulation results document that DOTS provides fair medium access even with node mobility. A channel access protocol for ad-hoc underwater acoustic networks. The protocol saves transmission energy by avoiding collisions while maximizing throughput. This protocol achieves a throughput several times higher than that of the Slotted FAMA, while offer related savings in energy.
Authors and Affiliations
Nandhini Selvam, Karthick Krishnamoorthy
Keywords
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