Random early detection gateways for congestion avoidance
IEEE/ACM Transactions on Networking (TON)
Voice over IP performance monitoring
ACM SIGCOMM Computer Communication Review
Impact of link failures on VoIP performance
NOSSDAV '02 Proceedings of the 12th international workshop on Network and operating systems support for digital audio and video
Introduction to IP and ATM Design and Performance: With Applications Analysis Software
Introduction to IP and ATM Design and Performance: With Applications Analysis Software
On Class-Based Isolation of UDP, Short-Lived and Long-Lived TCP Flows
MASCOTS '01 Proceedings of the Ninth International Symposium in Modeling, Analysis and Simulation of Computer and Telecommunication Systems
Using router DiffServ mechanisms to implement military QoS
MILCOM'03 Proceedings of the 2003 IEEE conference on Military communications - Volume II
On the building blocks of quality of service in heterogeneous IP networks
IEEE Communications Surveys & Tutorials
Congestion control mechanisms and the best effort service model
IEEE Network: The Magazine of Global Internetworking
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
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Classical queueing theory tells us that mean delays are inversely proportional to unused capacity. For real-time traffic, this means congested network resources can cause most packets to go "out of contract". With delay and jitter bounds exceeded, delivered content is of no use to the application, resulting in sudden, catastrophic service degradation. Current QoS approaches in IP aim to prevent congestion by limiting load and using priority scheduling. In environments with heterogeneous QoS requirements, multiple application priority levels, and time varying resource capacities, such an approach is not easily scalable. This paper presents an overview of the theory to support a totally new perspective on congested shared resources. The new approach maintains both delay and jitter performance under congestion, while packet loss is gracefully degraded. We call this the BOUnded Delay IP CoS/QoS Configuration Architecture (BOUDICCA). BOUDICCA makes use of existing widely deployed IP QoS mechanisms to deliver graceful degradation for real-time services. We present analytical results for a DiffServ scenario under homogeneous and heterogeneous service congestion, and when link capacity is degraded. We quantify the performance improvements by using the ITUT E-model to assess VoIP quality. The key benefit is that service quality can be maintained both up to and beyond normal fully loaded conditions on congested bottlenecks.