Avoiding Heterogeneous Interference through Dynamic Routing in Wireless Sensor Networks

摘要

Interference between WSN and other heterogeneous wireless networks, such as WiFi, Bluetooth et al, is a growing problem. Heterogeneous Interference (HI) may cut down reliability and throughput, as well as increase energy consumption. From the viewpoint of routing protocol, heterogeneous interference leads to frequent change of network topology and some nodes become isolated. Traditional routing algorithms are lack of appropriate interference control scheme in the heterogeneous interference environment. There always have such problems as complex technical cost, large overhead and poor performance. HI-Aware Dynamic Routing (HIADR) algorithm is capable of bypassing the strong heterogeneous interference sources and considerably utilizing nodes affected by weak interference or without any interference so as to improve the overall performance in WSN. Utilizing the concept of potential in classical physics, HIADR is designed through constructing a hybrid virtual potential field using depth and HI intensity to force the packets to steer clear of obstacles created by heterogeneous interference. Employing the RSSI-based interference estimation mechanism, HIADR can bring only a small amount of computational overhead on the local nodes. The experimental results show that HIADR can effectively avoid heterogeneous interference so as to improve the overall packet reception rate and forwarding load balance as compared to CTP.