TI Local Allocation of End-To-End Quality-of-Service in
High-Speed Networks  

LT COINS TR 92-77  

AU R. Nagarajan 

AU J. Kurose 

AU D. Towsley 

YR 1992 

MN November 

OR UMASS 

AB Quality-of-service (QOS) requirements for applications in
high-speed networks are typically specified on an end-to-end
basis. Mapping this  end-to-end requirement to nodal requirements
facilitates providing QOS guarantees and simplifies connection
admission. In this paper, we  evaluate strategies for local
allocation of the end-to-end QOS. A QOS  allocation policy is
said to perform better than another when the maximum network load
that it can support is greater. A major contribution of this work
is the development of a {\it nodal metric}  that predicts the
relative performance of QOS allocation policies in a network
setting. Computation of the nodal metric and direct evaluation of
allocation policy performance for two simple network models yield 
valuable insight into the choice of allocation policies. It is
found that with the {\it packet loss probability} as the QOS
metric,  there is {\it little difference in the performance of
allocation policies} in the regime of applications with low loss
requirement  >From a practical viewpoint, this suggests that a
simple allocation policy may be adopted in this scenario with
only a small decrease in  carried load with respect to an optimal
policy. ----------------- This research was supported in part by
the National Research Foundation under grant NCR-9116183 and the
Defense Advanced Projects Research Agency under contract
NAG2-595.