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Abstract
—Wireless sensor network is a network composed of a large number of sensor nodes with limited radio capabilities and one or a few sinks that collect data from sensor nodes. Sensor nodes are powered by small batteries, hence, the energy consumption in operating a WSN should be as low as possible. Hence, the whole network lifetime can be prolonged by balancing the communication load at heavily loaded nodes around a sink. This problem is called the energy hole problem and is one of the most important issues for WSNs.It proposes to address the energy efficiency problem by synchronizing the transmission times of all the nodes in the system. Transmission synchronization presents energy saving opportunities through dynamic power management of the WSN network interface. That is, nodes can switch off their wireless interfaces between transmissions.