Recent Time Synchronization Protocol’s in Wireless Sensor Networks

Time synchronization is essential for any kind of network due to network software requirements. Since WSNs have particular constraints and limitations'; synchronizing the physical times for these networks is considered to be a complex task. In this paper we study newly presented time synchronization protocols in wireless sensor networks. There are some synchronous and asynchronous methods. Some are based on remote clock reading and others are based on source clock frequency recovery. Energy consumption is critical in WSN. Minimizing the number of message transmissions from sensor nodes to the head node or from the head to the source nods is the best way to save energy. We will discuss some of the methods of time synchronization in WSN. We will discuss TFTS, ISTS, Algorithm Based on SFD, Double-Broadcasting for WSN and Indirect-Broadcasting Synchronization Protocol for WSN. Each method has its certain characteristics such as power consumption and accuracy and so on. Study results shows that each network should have its own operational time synchronization protocol due to its own needs. In this paper, the researcher studies recent time synchronization protocols.

کلیدواژه ها:

WSN ، Power Consumption ، TSP ، Non Deterministic