Energy Efficiency Scheduling Methods for congestion free Wireless Sensor Networks

In Wireless Sensor Network (WSN), the IEEE 802.15.4 (Zigbee) protocol stack is a promising technology to attain minimum power transmission in the minimum-rate and short rangewireless Personal Area Network (PAN). The cluster tree topology of IEEE 802.15.4 consists of a PAN coordinator, cluster coordinator and numerous sensor devices. During a period of time, the PAN coordinator transmits the beacon frame to its cluster coordinators;likewise the cluster coordinate node transmits the beacon frames periodically to their sensor nodes. The main issue in this network is the collision among beacons or even between the data frames and the beacon, which impact badly the network performance. Additionally, the energy efficiency is a prime concern in WSN. Hence this paper proposes an Energy Efficiency Scheduling Methods for congestion free Wireless Sensor Networks. A superframe duration scheduling algorithm based on the preemptive approach is presented to the QoS constraint WSN application. Additionally, an energy efficient duty cycle based on the data aggregation is proposed. The proposed approach is compared with the existing Time Division Beacon Scheduling approach and has been evaluated using the NS2 simulationin terms of energy efficiency, delay, throughput, packet delivery ratio.