An On-Demand Routing Using Signal Strength for Multi-Rate Ad Hoc Networks

Masaki BANDAI  Takashi WATANABE  

IEICE TRANSACTIONS on Communications   Vol.E90-B    No.9    pp.2504-2512
Publication Date: 2007/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.9.2504
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Network
ad hoc networks,  routing,  multi-rate,  

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In this paper, to realize the low delay and high throughput route discovery in multi-rate ad hoc networks, we propose a novel on-demand routing using signal strength, called signal strength aware routing (SSR). SSR is based on the on-demand routing with the route request (RREQ) and route reply (RREP) procedure. In SSR, a node measures the signal strength of a received RREQ, and calculate the appropriate data transmission rate. Nodes also calculate the standby time for the RREQ forwarding proportionally to the medium time at the data transmission rate. A RREQ through higher data rate links arrives at the destination earlier, and the destination can select a low delay and high throughput route easily. We evaluate the performance of SSR in terms of delay, throughput and route discovery delay by means of QualNet network simulator. As a result, we show that SSR can discover the lower delay and higher throughput route than the conventional shortest hop routing without increasing control overhead in multi-rate ad hoc networks.