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Topology control protocols try to decrease average of node's transition radius without decreasing network connectivity. In this paper, we propose a topology control protocol and maintain the connectivity of the sensor network by adjusting the transition radius of the sensor nodes. In this protocol, proper transition radius of the sensor nodes can be determined using the harmony search algorithm. Due to the proposed protocol accuracy in selecting the transition radius of sensor nodes, it is able to provide the full connectivity in sparse deployment. Moreover, as the result of increasing nodes density, the proposed protocol decreases the energy consumption of the sensor network and prolongs the network lifetime. We have simulated our protocol and simulation results show high efficiency of the proposed protocol.