Published Paper Details:

The formation of clusters and cluster heads in wireless sensor network(WSN) leads to overhead. Such overhead is reduced by using proper medium access control design . Reliability and sleep scheduling of nodes is achieved by such protocols. There are two types of Medium Access control protocol, they are contention and contention free based protocol. The contention based protocols are CSMA/ CA. There is heavy contention of nodes for channel access [1]. When node density and network traffic are moderate or high, they suffer high collision rates because of concurrent channel access, which in turn increases the packet drop rate. As a result, for large networks contention based protocols are not suitable. This drawback is overcome by using contention free protocol such as TDMA [2] [3]. In such schemes, a specific time slot to is assigned by the cluster head to each node in the cluster, and the node uses that time slot to transmit. The sleep time of nodes increases by using TDMA. The reliability and the energy efficiency of the network are also improved. In many of the clustering techniques that utilized TDMA hop selection and probability of packet failure was not considered. Packet loss introduces an overhead for both intra and inter cluster communication. This makes network unreliable as energy consumption increases. This aspect is studied by determining packet failure probability. Here an energy optimization technique and a packet failure likelihood estimation technique are presented. The proposed energy efficient model performs better than the existing LEACH in term of lifetime of network. When the number of nodes are increased, results show that proposed model performs better than LEACH(Low Energy Adaptive Clustering Hierarchy)