Essentials of fuzzy modeling and control
Essentials of fuzzy modeling and control
Wide area traffic: the failure of Poisson modeling
IEEE/ACM Transactions on Networking (TON)
Efficient fair queueing using deficit round-robin
IEEE/ACM Transactions on Networking (TON)
A measurement-based admission control algorithm for integrated service packet networks
IEEE/ACM Transactions on Networking (TON)
Proportional differentiated services: delay differentiation and packet scheduling
Proceedings of the conference on Applications, technologies, architectures, and protocols for computer communication
Adaptive proportional delay differentiated services: characterization and performance evaluation
IEEE/ACM Transactions on Networking (TON)
Performance Guarantees for Web Server End-Systems: A Control-Theoretical Approach
IEEE Transactions on Parallel and Distributed Systems
Proportional differentiated services: delay differentiation and packet scheduling
IEEE/ACM Transactions on Networking (TON)
Feedback Control of Dynamic Systems
Feedback Control of Dynamic Systems
JoBS: Joint Buffer Management and Scheduling for Differentiated Services
IWQoS '01 Proceedings of the 9th International Workshop on Quality of Service
Queueing Model Based Network Server Performance Control
RTSS '02 Proceedings of the 23rd IEEE Real-Time Systems Symposium
A Feedback Control Approach for Guaranteeing Relative Delays in Web Servers
RTAS '01 Proceedings of the Seventh Real-Time Technology and Applications Symposium (RTAS '01)
Robust Processing Rate Allocation for Proportional Slowdown Differentiation on Internet Servers
IEEE Transactions on Computers
eQoS: Provisioning of Client-Perceived End-to-End QoS Guarantees in Web Servers
IEEE Transactions on Computers
Using fuzzy control to maximize profits in service level management
IBM Systems Journal
A case for relative differentiated services and the proportional differentiation model
IEEE Network: The Magazine of Global Internetworking
NPC '08 Proceedings of the IFIP International Conference on Network and Parallel Computing
Enhancing web server relative delay services by an integrated SA-fuzzy logic controller
International Journal of Web Engineering and Technology
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Proportional delay differentiation (PDD) is an important service model for providing relative differentiated services on the Internet. It aims to maintain pre-specified packet queueing-delay ratios between different classes of traffic at each hop. Existing rate-allocation approaches for PDD services assume the average queueing delay of a class is inversely proportional to its service rate. This assumption is not necessarily valid when the system is not heavily loaded. To provide consistent PDD services under various load conditions, in this paper, we propose a novel rate-allocation approach that applies fuzzy control theory to capture the nonlinear relationship between the queueing delay and the service rate. In the approach, a class's service rate is adjusted according to a set of fuzzy control rules defined over its error (the difference between the target delay ratio and the achieved one), the change of error, and the change of service rate. We prove that the fuzzy control system is stable and the service rate of a class converges to its equilibrium point at steady state. Simulation results demonstrate that, in comparison with other rate-allocation approaches, the fuzzy control approach is able to provide consistent PDD services under wide range load conditions. It is also shown robust under various system conditions, including with multiple classes, changing target delay ratios, changing load conditions, and different traffic patterns.