Two-Level Priority Real-Time Scheduling Strategy for Node System in Wireless Sensor Network

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 Two-Level 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.