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International Journal of Distributed Sensor Networks
Volume 2012 (2012), Article ID 686172, 12 pages
http://dx.doi.org/10.1155/2012/686172
Research Article

Rendezvous Data Collection Using a Mobile Element in Heterogeneous Sensor Networks

Software School and State Key Lab of ISN, Xidian University, Shaanxi 710071, China

Received 11 January 2012; Accepted 20 February 2012

Academic Editor: Mo Li

Copyright © 2012 Junzhao Du et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We study the rendezvous data collection problem for the Mobile Element (ME) in heterogeneous sensor networks where data generation rates of sensors are distinct. The link quality is instable in our network model and the sensory data cannot be aggregated when transmitting. The Mobile Element is able to efficiently collect network wide data within a given delay bound; meanwhile the network eliminates the energy bottleneck to prolong its lifetime. For case study, we consider the trajectory planning for both Mobile Relay and Mobile Sink on a tree-shaped network. In the Mobile Relay case where the ME’s trajectory must pass through a sink to upload sensory data for further processing, an 𝑂 ( 𝑛 lg 𝑛 ) algorithm named RP-MR is proposed to approach (1) the optimal Rendezvous Points (RPs) to collect global sensory data; (2) the optimal data collection trajectory for the Mobile Relay to gather the cached data from RPs. In the Mobile Sink case where the Mobile Element can process the sensory on its motion, we develop an 𝑂 ( 𝑛 lg2 𝑛 ) algorithm named RP-MS to recursively investigate the optimal solution. Both the theoretical analysis and extensive simulations verify the correctness and effectiveness of proposals.