Share Email Print

Proceedings Paper

Achieving fair and predictable service differentiation through traffic degradation policies
Author(s): Vasil Hnatyshin; Adarshpal S. Sethi
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Recently a large number of approaches to service differentiation have appeared in the literature. Most of these approaches are based on the Differentiated Services (DiffServ) Architecture proposed by IETF and they have been evaluated in a number of independent studies. It is widely acknowledged that the Differentiated Services approach provides proper service differentiation in well-provisioned networks under normal traffic conditions. However DiffServ may fail to provide proper service differentiation in the presence of extreme network conditions such as congestion or in under-provisioned networks, resulting in unfair service degradation and unpredictable traffic behavior. We believe that the main reasons for the failure of service differentiation under extreme network conditions are static per-aggregate resource allocation and the lack of the specification of traffic behavior during the congestion. We propose to explicitly define traffic behavior through so called degradation policies. Degradation policies would specify how much of the network resources each traffic class could receive under different levels of congestion. In particular, the degradation policy would specify traffic behavior in terms of the performance parameters like delay, loss, or throughput. Such an approach to service differentiation allows dynamic allocation of traffic resources while maintaining fairness and predictability of the traffic behavior under all network conditions.

Paper Details

Date Published: 27 July 2001
PDF: 12 pages
Proc. SPIE 4524, Quality of Service over Next-Generation Data Networks, (27 July 2001); doi: 10.1117/12.434352
Show Author Affiliations
Vasil Hnatyshin, Univ. of Delaware (United States)
Adarshpal S. Sethi, Univ. of Delaware (United States)

Published in SPIE Proceedings Vol. 4524:
Quality of Service over Next-Generation Data Networks
Mohammed Atiquzzaman; Mahbub Hassan, Editor(s)

© SPIE. Terms of Use
Back to Top