AKIN, OZDEMIR. Active Queue Management and Scheduling Methods for Packet-Switched Networks (under the supervision of Dr. J. Keith Townsend) To support the myriad of envisioned communication products of the future, there is a need to develop a network infrastructure that can provide larger bandwidth, with better control of quality of service (QoS). However, with increasing demand for application...

Network management and control is a complex problem, which is becoming even more challenging with the increased demand to use the internet for time/delay-sensitive applications with differing QoS requirements. The existing TCP congestion avoidance and control mechanisms are insufficient to provide good service in all conditions. The TCP has successfully governed the Internet congestion control ...

Recent studies have shown that a non-negligible number of packets face multiple congested links on Internet paths. We investigate the impact of multiple congested links on Active Queue Management (AQM) techniques. We present the results of an ns-2 evaluation study of various AQM techniques that, in contrast to previous studies of AQM, uses a complex network topology including up to 3 congested ...

With the network architecture more and more complex, it is an interesting problem how to cooperate many routers working in the multilayer network simultaneously. Since these AQM (Active Queue Management) algorithms based on the single router have not considered the link capacity of connected routers, there are some disadvantages, e.g., it is difficult to deal with the congestion problem effecti...

A NEW PI AND PID CONTROL DESIGN METHOD AND ITS APPLICATION TO ACTIVE QUEUE MANAGEMENT OF TCP FLOWS Deniz Üstebay M.S. in Electrical and Electronics Engineering Supervisor: Prof. Dr. Hitay Özbay June 2007 PID controllers are continuing to be used in many control applications due to their simple structures. Design of such controllers for unstable systems with time delays is an active research are...

This paper describes and evaluates the use of steady-state TCP behavior knowledge for proactive queue management (PQM). We show how routers can use flow parameters and the knowledge of TCP end-host behavior to intelligently mark packets to prevent queue build-up, and thus prevent congestion from ever occurring, while at the same time provide high link utilization and low packet loss. This is in...

Ad hoc networks, being able to organize themselves without user intervention, can easily provide their users with mobility, multimedia support and group communication. However, they have to combine quality of service (QoS) and multicast routing strategies. This article defines the resource management and admission control components of the ad hoc QoS multicast (AQM) routing protocol, which achi...

Recently, indoor air quality monitoring (AQM) has become an important research area for the concern of human health and lifestyle. The AQM is usually based on the deployment of wireless sensor networks (WSN) within the building. Bridging the gap between gas sensors, deployed at different locations of the WSN, and the Internet becomes a challenging task in terms of link reliability and data inte...

Wireless access points act as bridges between wireless and wired networks. Since the actually available bandwidth in wireless networks is much smaller than that in wired networks, there is a bandwidth disparity in channel capacity which makes the access point a significant network congestion point. The recently proposed active queue management (AQM) is an effective method used in wired network ...

State-of-the-art Internet is a decentralized control system employing dynamic Transmission Control Protocols at the sources and Active Queue Management protocols at the routers. The predominant transmission control protocol suites are variants of TCP [1] .TCP flow control is the most important mechanism for congestion control in IP networks. Since Jacobson proposed the end-to-end flow control s...