Document Type

Technical Report

Department

Computer Science and Engineering

Publication Date

2001-01-01

Filename

WUCS-01-06.PDF

Technical Report Number

WUCS-01-06

Abstract

In this proposal, we consider the problem of resource reservation for Integrated Services (IntServ) and Differentiated Services (DiffServ) networks. Current approaches for resource reservation in INtegrated Service Networks adopt an all-or-nothing approach, where partially acquired resources must be released if resources are not available at all routers on the chosen path. Furthermore, under high load, end-systems must retry requests repeatedly leading to inefficient allocation and increased traffic. We propose a new approach called Deferred REServation (DERS) that substantially improves performance (reduces the overall cell rejection probability and increases link utilization) over the all-or-nothing reservation approach. Call admissibility is increased by deferring requests at routers for a limited period of time until resources are available. Simulation results confirm the performance benefits of our approach. We describe mechanisms to predict the defer time that helps to minimize the resources blocked due to partial reservations, and allows alternate routing mechanisms to further enhance performance. We present scalable QoS routing mechanisms that can be integrated with the DRES approach, and require minimum complexity. Finally, we describe an approach to design a topology that realistically approximates and ISP network over which we plan to evaluate the cost-performance benefits of DRES.

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Permanent URL: http://dx.doi.org/10.7936/K7H70D1Q

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