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Issue No. 01 - January (2010 vol. 21)
ISSN: 1045-9219
pp: 126-138
Wei Dong , Zhejiang University, Hangzhou
Chun Chen , Zhejiang University, Hangzhou
Xue Liu , McGill University, Montreal
Kougen Zheng , Zhejiang University, Hangzhou
Rui Chu , National University of Defense Technology, Changsha
Jiajun Bu , Zhejiang University, Hangzhou
We propose FIT, a flexible, lightweight, and real-time scheduling system for wireless sensor platforms. There are three salient features of FIT. First, its two-tier hierarchical framework supports customizable application-specific scheduling policies, hence, FIT is very flexible. Second, FIT is lightweight in terms of minimizing the thread number to reduce preemptions and memory consumption while at the same time ensuring system schedulability. We propose a novel Minimum Thread Scheduling Policy (MTSP) exploration algorithm within FIT to achieve this goal. Finally, FIT provides a detailed real-time schedulability analysis method to help check if application's temporal requirements can be met. We implemented FIT on MicaZ motes and carried out extensive evaluations. Results demonstrate that FIT is indeed flexible and lightweight for implementing real-time applications, at the same time, the schedulability analysis provided can predict the real-time behavior. FIT is a promising scheduling system for implementing complex real-time applications in sensor networks.
Real-time and embedded systems, hierarchical design, scheduling, wireless sensor networks.

J. Bu, X. Liu, C. Chen, W. Dong, K. Zheng and R. Chu, "FIT: A Flexible, Lightweight, and Real-Time Scheduling System for Wireless Sensor Platforms," in IEEE Transactions on Parallel & Distributed Systems, vol. 21, no. , pp. 126-138, 2009.
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