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In Sensor-MAC (S-MAC) protocol, a node located between two or more virtual clusters is called boarder node that adopts different listen and sleep schedules. These border nodes consume a large amount of energy as they switch to the listening mode often due to diversified scheduling which in turns decreases the lifetime of the wireless sensor network. This paper proposed a new unified scheduling method to solve the diversified scheduling problem of border nodes in S-MAC and evaluated the performance through simulation. It has been observed from the simulated results that the border nodes have consumed less power in case of large network as well as small networks.
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