Optimal Energy-sensitive Routing Algorithm In PON-WSN Hybrid Networks

Wireless sensor network is a network mode with a high degree of integration of sensortechnology, wireless communication technology, computer technology and so on. It can bewidely used in military, environmental monitoring, traffic management, health care,Internet of Things, and many other aspects. In WSN, sensor’s energy and processingcapability is limited. So it’s significant to find out how to reduce the energy consumptionof sensor nodes to extend the network lifetime. Since nodes’energy consumption is mostlycaused by data transmission, the design of energy-based routing algorithm in WSNbecomes a key researching point.In this paper, we propose a PON-WSN hybrid network to provide ONU as clusterhead with high-performance in WSN subnet. Considering the energy mode in wirelesscommunication, the energy consumption in WSN subnet is abstracted as a mathematicaloptimization problem and we propose a hybrid heuristic algorithm of routing. Thereby theaverage energy consumption of sending packets is reduced.Then due to cost restriction, we should consider the number and arrangement of ONUwhile enhancing network lifetime. We research the optimal ONU set problem. Althoughgreedy algorithm can find the smallest set, some flaws are detected. Then we modify itand get some performance improvement. According to different network scale and maxhop count, we apply the former hybrid algorithm to find path and identify the optimalONU set.Finally, in order to make the problem generalization, we proposed a design ofmulti-layer heterogeneous WSN. We show the structure and construct the energy mode. Atlast, we design the routing protocol in detail. The simulation results show that compared toclassical routing protocol, ours can greatly enhance the network lifetime and also maintainthe network stability to a certain degree.