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SPEED: A Stateless Protocol for Real-Time Communication in Sensor Networks Tian Hea John A Stankovica Chenyang Lub Tarek Abdelzahera a Department of Computer Science b Department of Computer Science Engineering University of Virginia Washington University in St Louis {tianhe, stankovic, zaher}@ lu@ Abstract mentioned three types of communication services. In this paper, we present a real-time communication Since sensor networks deal with real world, it is often protocol for sensor networks , called SPEED. The protocol necessary for communication to meet real-time constraints. provides three types of real-time communication services, In surveillance systems, for example, communication de- namely, real-time unicast, real-time area-multicast and lays within sensing and actuating loops directly affect the real-time area-anycast. SPEED is specifically tailored to be quality of tracking. To date, few results exist for sensor a stateless, localized algorithm with minimal control over- networks that adequately address real-time requirements. In head. End-to-end soft real-time communication is achieved this paper we develop a protocol SPEED that supports soft by maintaining a desired delivery speed across the sensor real-time communication based on feedback control and network through a novel combination of feedback control stateless algorithms for large-scale sensor networks. We and non-