Computing at Glasgow University
Paper ID: 8939
DCS Tech Report Number: TR-2008-286

Improvement to Blocking Expanding Ring Search for MANETs
Al-Rodhaan,M. Mackenzie,L.M. Ould-Khaoua,M.

Publication Type: Tech Report (internal)
Appeared in: DCS Technical Report Series
Page Numbers : 13
Publisher: Dept of Computing Science, University of Glasgow
Year: 2008

Blocking-ERS is an energy efficient route discovery algorithm for MANETs. It uses chase packets to improve the route request process. In Blocking-ERS, most of the time the fulfilled route request manages to escape from the chase packet with the help of mobility. So its success rate in the catching process is low due to the immature discard of chase packets. In this report, we are proposing an improved algorithm named Blocking-ERS-Plus to overcome this deficiency in Blocking ERS by allowing chase packets be broadcasted until the catching is insured to maximise the success rate. We provide detailed performance evaluation using simulation modelling and compare Blocking-ERS Plus with both Blocking-ERS and AODV. Our findings show that Blocking ERS Plus outperforms both Blocking-ERS and AODV by reducing end to-end delay due to the reduction in network congestion and by improving route request latency, routing overhead, and packet loss due to the higher success rate in the catching process which has positive impact on the network performance.

Keywords: MANETs, On-demand routing protocols, Route Discovery, Chase Packets, Performance analysis, ERS, Blocking-ERS.

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