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Review of Supporting Real-Time Applications in an Integrated Services Packet Network: Architecture and Mechanism
 

Summary: Review of Supporting Real-Time Applications in an Integrated Services Packet Network:
Architecture and Mechanism
By Holly Esquivel
Summary
The authors of this paper present a new architecture and mechanism for real-time applications on
networks. They call their protocol ISPN architecture, which allows for both guaranteed and
predicted service of real-time applications. They explain that there are four main issues that their
architecture was trying to solve: a commitment for service, a interface in which the source and
network could agree on parameters, a packet scheduling mechanism, and a way to establish
service and traffic agreements. Real-time application characteristics are explained along with the
types of delay these packets face such as propagation, switch transmission and queue delays.
After looking at delay, they saw that real-time applications have different limits on the amount of
delay they can experience and thus, can sometimes be bursty. They develop/integrate different
algorithms to help achieve these types of services to different application flows. For guaranteed
service they propose using a token bucket , but more specifically a WFQ algorithm. This allows
for a fluid flow model where one flow can only overwhelm itself and hurt its own delay. Thus
the jitter a flow might experience should only be proportional to the burst. For predicted service
they utilize a modified FIFO+ algorithm. This way the jitter experienced is spread over a number
of flows, thus allowing for bursty traffic. Although there is no isolation this keeps the one flow
from having a majority of its packets surpass the play-back point at the cost of a few packets of

  

Source: Akella, Aditya - Department of Computer Sciences, University of Wisconsin at Madison

 

Collections: Computer Technologies and Information Sciences