Priority based Fuzzy Decision Multi-RAT Scheduling Algorithm in Heterogeneous Wireless Networks

Abstract

In this paper, we focus on the scheduling algorithm of heterogeneous wireless networks where the traffic has different requirements constrains which are needed to be fulfilled without exceeding the internal constrains of the node. We propose a priority based Fuzzy decision packet scheduling algorithm which is mainly based on delay, channel quality conditions, type of call (Handoff or new call) and classes of service. Using those parameters as an input, the Fuzzy logic approximates decision making using natural language terms instead of quantitative terms. The inputs to the Fuzzy system are fuzzified, implicated, aggregated and defuzzified to obtain the crisp value which represents the packet priority index. The simulation of the presented method is performed using Matlab and the results show that the presented scheme satisfactorily performs the system requirements and they prove that inclusion of the Fuzzy approach on the scheduler improves the packet drop ratio and minimize the end-to-end delay.