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Issue No.05 - May (2009 vol.8)
pp: 653-667
Hongwei Zhang , Wayne State University, Detroit
Anish Arora , Ohio State University, Columbus
Prasun Sinha , Ohio State University, Columbus
ABSTRACT
In the context of IEEE 802.11b network testbeds, we examine the differences between unicast and broadcast link properties, and we show the inherent difficulties in precisely estimating unicast link properties via those of broadcast beacons even if we make the length and transmission rate of beacons be the same as those of data packets. To circumvent the difficulties in link estimation, we propose to estimate unicast link properties directly via data traffic itself without using periodic beacons. To this end, we design a data-driven routing protocol Learn-on-the-Fly (LOF). LOF chooses routes based on ETX/ETT-type metrics, but the metrics are estimated via MAC feedback for unicast data transmission instead of broadcast beacons. Using a realistic sensor network traffic trace and an 802.11b testbed of ~195 Stargates, we experimentally compare the performance of LOF with that of beacon-based protocols, represented by the geography-unaware ETX and the geography-based PRD. We find that LOF reduces end-to-end MAC latency by a factor of 3, enhances energy efficiency by a factor up to 2.37, and improves network throughput by a factor up to 7.78, which demonstrate the feasibility and the potential benefits of data-driven link estimation and routing.
INDEX TERMS
Routing protocols, Sensor networks, Algorithm/protocol design and analysis
CITATION
Hongwei Zhang, Anish Arora, Prasun Sinha, "Link Estimation and Routing in Sensor Network Backbones: Beacon-Based or Data-Driven?", IEEE Transactions on Mobile Computing, vol.8, no. 5, pp. 653-667, May 2009, doi:10.1109/TMC.2008.155
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