Proceedings Work-In-Progress Session of the 14th Real-Time and Embedded Technology and Applications Symposium, 22-24 April, 2008 St. Louis, USA
نویسندگان
چکیده
Emerging applications such as forest fire monitoring have increasing demands on WSN to transmit data in real-time. In order to ensure real-time data transmission, it requires that the operating system of a node should schedule tasks in real-time. TinyOS is one of the most popular operation systems that support multifarious applications. However, its FIFO scheduling strategy does not guarantee requirements for hard real-time applications. A TwoLevel Priority (TLP) Real-time Scheduling Strategy is proposed in this paper. Two tier priorities, static and dynamic, are designed and integrated in TinyOS task queue to guarantee the real-time task scheduling. We demonstrate this approach by a real-world case study: a WSN hardware node embedded with our task scheduling strategy is designed and implemented. The result demonstrates that our TLP real-time scheduling strategy performs efficiently in terms of packet throughput and task scheduling time.
منابع مشابه
Work - In - Progress Session of the 13 th Real - Time and Embedded Technology and Applications Symposium 3 - 6 April , 2007 Bellevue , USA Organized by the IEEE Technical Committee on Real - Time Systems
Scheduling policies for real-time systems exhibit threshold behavior that is related to the utilization of the task set they schedule, and in some cases this threshold is sharp. For the rate monotonic scheduling policy, we show that periodic workload with utilization less than a threshold U∗ RM can be scheduled almost surely and that all workload with utilization greater thanU∗ RM is almost sur...
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