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Dynamic Bandwidth Allocation |
While a significant portion of Internet traffic is still best-effort, emerging
applications with different quality of service(QoS) requirements
(e.g., multimedia) are evolving in a faster pace and require more than
best-effort services. The Integrated Services (IntServ) model attempts to
achieve an end-to-end per flow QoS through RSVP, and it lacks scalability.
The differentiated services (DiffServ) model, on the other hand,
attempts to classify packets based on their QoS requirements to receive
different services, and it is the focus of recent IETF activity.
To ensure QoS, the admission control policy and the packet scheduler
should work in tandem to
i) control the misbehaved traffic through policing, shaping, metering, pricing
techniques, and
ii) contain the delay, delay variation, packet loss rate, and bandwidth loss
through robust packet scheduling policies.
In this paper, we propose an adaptive admission control that
reduces bandwidth loss when the traffic is light and enforces a
stringent traffic regulation when the traffic load is high. A similar mechanism
is used for the packet scheduler that maintains the QoS metrics adaptively
within their limited boundaries.
Internet2 traffic traces and Opnet synthetic traffic have be used to
evaluate the performance of the algorithms.
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Last Updated ( Sunday, 17 October 2004 )
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