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ABSTRACT:The design of wireless sensor networks for distributed applications is the most challenging task due to the factors such as limited storage on nodes, variable data arrival rate and high energy cost of communication. In most Wireless Sensor Networks(WSN), the battery is the sole energy source of the sensor node. The Sensor nodes are expected to work on batteries for several months to a few years without replenishing. Thus, energy efficiency becomes a major issue in WSNs. Nowadays, it is desired to use the WSN in heterogeneous platform for multiple monitoring. The Software development for the sensor node is a tedious task due to the change in network topology. The present state of art has come up with different solutions to overcome the performance issues such as Memory overhead, Heterogeneity, Portability, Scalability, Cost and Quality of Service. An adaptive framework should minimize the resource consumption and provide an optimal solution for run-time Reconfiguration. This paper presents a detailed review on current state-of-the art in the Run-time Reconfigurations of Wireless Sensor Networks. An Analysis is made on the existing middleware approaches and an evaluation is done based on the parameters like Application Openness, Scalability, Heterogeneity, User Friendly Interface, Mobility and Power Efficiency. The paper identifies a few open research issues that must be addressed during the Run-Time Reconfigurations of Wireless Sensor Networks.

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