Abstract: "Stream vs Elastic traffic in a priority system with traffic"

Almost all traffic in todays networks can be classified as being either

stream or elastic traffic. Stream traffic is generated by time-sensitive

applications like VoIP, video etc and has strict bandwidth and delay

requirements. Elastic traffic on the other hand is generated by

applications such as file-transfers where the total download time is

more important than inter-packet or end-to-end delay. The support of

these two traffic types is possible either with a Differentiated

(DiffServ) or an Integrated Services (IntServ) architecture. However,

both DiffServ and IntServ rely on efficient scheduling mechanisms and

control to meet the requirements of these traffic types. In order to

meet the strict delay requirements of stream traffic, the choice of

priority scheduling in inevitable. The danger with priority scheduling

lies in its potential starvation of lower priority traffic classes for

example the elastic traffic class. Therefore, it is essential to

understand and capture t!

he relation between stream and elastic traffic behaviour, priority

scheduling and traffic control. In this paper we focus on developing

simple yet effective approximations to capture this relationship. We

assess the accuracy of the approximation against simulations and and

other well-known simple and straightforward techniques for a wide range

of parameters. Results show that our proposed technique is a

considerable improvement to other standard approximation techniques and

is at the same time not cumbersome.