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Wireless sensor nodes are resource constrained and mostly operate in unsafe environments. Displacement, communication blockage and frequent failure of wireless sensor nodes cause network topology to become very dynamic that affects network connectivity. Lack of topological connectivity between nodes may lead the entire network to break apart into disconnected pieces. The disconnected sub-networks may be unable to communicate with the sink, hence cannot send its data to base station. Many researchers have devoted their efforts to develop network communication schemes that have proven better network connectivity, communication performance and prolonged network lifetime.
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