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This paper is to propose a reliability model for a fault tolerant wireless sensor network using context awareness feature in order to evaluate network reliability by modeling in PI Calculus. The earlier Propositional Directed Acyclic Graph (PDAG) approach leads to an identification of a suitable structure function in polynomial time to evaluate the reliability of Wireless Sensor Network (WSN). In that approach, the nodes and links of the network are assumed as context free, makes the determination of the reliability function complex if the number of nodes is increased. The context awareness of the nodes and links are used to decompose and reduce the structure function for that network of any topology.
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