Fuzzy QoS controllers based priority scheduler for mobile ad hoc networks

Mobile ad hoc network (MANET) is an autonomous system of mobile wireless nodes connected dynamically without any preexisting infrastructure. Here, since the nodes are mobile, the network topology changes rapidly and unpredictably over time. Quality of service (QoS) requirements in networks with uncertain parameters has become a very important research issue in the mobile ad hoc networks. The multi hop wireless forwarding of packets, broadcasting of control traffic and the fact that, all nodes may act as routers in addition to being sources and sinks of data in ad hoc networks produce different queuing behavior. Hence, a scheduling algorithm to schedule the packets based on their respective priorities will improve the performance of the network. Here, we present a fuzzy QoS controllers based priority scheduler for mobile ad hoc networks, to determine the priority of the packets. The performance of this scheduler is studied using NS2 and evaluated in terms of quantitative metrics such as packet delivery ratio, average end-to-end delay and throughput. Simulation shows that the approach is efficient, promising and applicable in ad hoc networks