On the reliability of backbone-assisted end-to-end transmissions in WSNs

Authors:
Ali Tufail;Syed Ali Khayam;Amna Ali;Waleed Akram Baig;Fatima Muhammad Anwar;Ki-Hyung Kim;Seung-Wha Yoo
Affiliations:
Graduate School of Information and Communication, Ajou University, Suwon, South Korea;School of Electrical Engineering and Computer Science, NUST, Rawalpindi, Pakistan;Graduate School of Information and Communication, Ajou University, Suwon, South Korea;Graduate School of Information and Communication, Ajou University, Suwon, South Korea;Graduate School of Information and Communication, Ajou University, Suwon, South Korea;Graduate School of Information and Communication, Ajou University, Suwon, South Korea;Graduate School of Information and Communication, Ajou University, Suwon, South Korea
Venue:
ICUFN'09 Proceedings of the first international conference on Ubiquitous and future networks
Year:
2009

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Abstract

Many anticipated deployment scenarios, in particular military, healthcare, and disaster-recovery applications, of Wireless Sensor Networks (WSNs) require reliable source to sink communication. Since transmission range of sensors is quite limited, to achieve higher end-to-end transmission reliability, WSNs generally employ intermediate backbone links (wired or wireless) that can deliver packets at larger distances. In this paper, we evaluate the reliability of backbone-assisted routing and dissemination in WSNs. In particular, we use reliability theory to investigate two important problems: a) if sensor node to backbone/gateway node ratio is fixed in a unit area, what is the maximum achievable reliability? b) How many wired hops or gateway nodes are required to achieve a given reliability? Finally we analyze the cost and benefit incurred by adding gateway nodes to a backbone-assisted WSN and observe that after a certain threshold adding more backbone nodes to the WSN provides negligible improvement in the overall end-to-end reliability.