NDLI: Using AF-PHB BOUDICCA Configuration for Reliable Real-Time Precedence-Based SLAs in Degraded IP Networks

Content Provider	IEEE Xplore Digital Library
Author	Pitts, Jonathan M. Yang, Qiang Schormans, John A.
Copyright Year	2007
Description	Author affiliation: Department of Electronic Engineering, Queen Mary, University of London, London E1 4NS, United Kingdom. (Pitts, Jonathan M.; Yang, Qiang; Schormans, John A.)
Abstract	Converged IP networks must cope with various types of uncertainty, such as traffic demand fluctuations, link speed degradation, and topological changes due to link failures. In environments with real-time QoS requirements and multiple levels of precedence, the impact of such uncertainties on end-to-end SLAs should be controllable levels of service degradation. Although there are other approaches to delivering QoS and precedence, we specifically investigate what can be achieved with packet marking and the DiffServ AF PHB configured to handle real-time VoIP traffic. This continues work reported at MILCOM 2006 on the queue theoretical foundations of the BOUnded Delay IP CoS/QoS Configuration Architecture (BOUDICCA) showing the benefits of AQM RED in delivering graceful VoIP QoS degradation under congestion. In this paper, we present the results of an extensive simulation study for an OSPF domain handling real-time traffic with multiple levels of precedence, and use the BOUDICCA approach to configure AF-PHB with WRED to handle three levels of precedence. We demonstrate that our novel configuration approach enables reliable delivery of precedence-based SLAs in the presence of both demand fluctuations and infrastructure degradation. Performance is quantified using the ITU-T E-model for VoIP quality. BOUDICCA offers practical design guidelines backed by analytical insight for real-time service assurance in heterogeneous environments, and has the potential to impact on network optimization, QoS routing, end-to-end multi-carrier provision, as well as precedence based SLA management.
Starting Page	1
Ending Page	7
File Size	417089
Page Count	7
File Format	PDF
ISBN	9781424415120
DOI	10.1109/MILCOM.2007.4455115
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Degradation IP networks Quality of service Traffic control Uncertainty Fluctuations Communication system traffic control Diffserv networks Queueing analysis Delay
Content Type	Text
Resource Type	Article

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