An Efficient Packet Scheduling with TDMA Technique for Secure Data Merge in Wireless Sensor Networks

Abstract

Wireless Sensor Networks have limited power capabilities and it has to serve real time applications which usually to be delivered before a deadline without collision. Hence it is essential to avoid collisions, reduce energy consumption and to have real time behavior .To achieve this goal we proposed a hybrid technique priority queues in combination with TDMA technique. In this priority queue, each node except the node at the last level has three levels of priority queues. Real-time packets are placed in the highest priority queue1. It can be processed with minimum delay. It can preempt the packets in the other queues. Non Real-time remote packets and local packets are placed in the second priority queue2 and priority queue3.Leaf nodes have one real-time packets queue and other for non-real-time local packets. Data Merge is applied in the parent node before transmitting the data into the other nodes. To reduce the number of transmission, efficient data merge technique is used to merge the data packet in intermediate nodes which has same destination node. Data merge utilize the maximum packet size by appending the merged packets with received packets till the maximum packet size or maximum waiting time is reached. Real- time data packets are directly forwarded to the next node without applying data merge. A new approach to TDMA can enhance the parallelism in signal transmission and utilize the unused time slot using inter and intra level approach and also using the concept of local clock synchronization. The performance is evaluated under various metrics like packet delivery ratio, packet drop, energy consumption and delay based on changing the number of nodes and transmission rate. Our results show significant reduction in various performance metrics. Reliable and trustful data merge obtain by preserving data and key from an adversary with less computational and communicational overhead. newline