Congestion-Aware Routing and Fuzzy-based Rate Controller for Wireless Sensor Networks

In this paper, congestion-aware routing and fuzzy- based rate controller for wireless sensor networks (WSNs) is proposed. The proposed method tries to make a distinc- tion between locally generated data and transit data by using apriority-basedmechanismwhichprovidesanovelqueueing model. Furthermore, a novel congestion-aware routing us- ing greedy approach is proposed. The proposed congestion- aware routing tries tofind more aordable routes. Moreover, a fuzzy rate controller is utilized for rate controlling which uses two criteria as its inputs, including congestion score and buer occupancy. These two parameters are based on total packet input rate, packet forwarding rate at MAC layer, number of packets in the queue buer, and total buer size at each node. As soon as the congestion is detected, the notifi- cation signal is sent to the ospring nodes. As a result, they are able to adjust their data transmission rate. Simulation results clearly show that the implementation of the proposed method using a greedy approach and fuzzy logic has done significant reduction in terms of packet loss rate, end-to-end delay and average energy consumption.