A cluster based on demand time synchronization in wireless sensor networks

Time synchronization is extremely important for wireless sensor networks. Since the sensors have very limited energy resources and it is very difficult to change batteries for the sensor nodes, energy efficiency is one of primary importance for a sensor network. To prolong the lifetime of a sensor network, we proposed a cluster based on demand time synchronization in wireless sensor networks(COD). In this protocol many nodes are set to “sleep” modes in most cases, for the formation of clustering and time synchronization procedure is initiated only when the event is detected. Compared to other clock synchronizat- ion protocols, the COD simulation results show that it is more energy efficient than RBS and FTSP.