A QoS-Oriented Protocol for Burst Admission Control in OBS Networks

Abstract

Among the promising solutions for next generation Internet backbones, one can consider the optical burst switching (OBS) technology. One of the main aspects in the design of optical burst-switched networks is the development of a burst admission control protocol suitable for QoS provisioning. In this paper, we develop a method to address the call admission control (CAC) in OBS networks that is QoS-oriented. For this, an analytic model is developed for formulating the burst admission control problem. A QoS-constraints based burst admission control protocol is developed. Finally, simulation experiments are performed to validate the proposed schemes.

A QoS-Oriented Scheme for a Real Time Admission Control in OBS Networks

“…The traffic received at an input port of a network node is supposed to be uniformly distributed between its two output ports. Two network configurations have been considered: an OBS network architecture that implements a previously proposed MVAbased CAC scheme [4], and an OBS network implementing the proposed real time CAC scheme.…”

“…A simulation is also conducted to validate the proposed scheme and evaluate its performances. Simulation particularly address the comparison of the performances of the developed scheme to the performances of a previously proposed MVA-based QoS-oriented CAC protocol [4]. Numerical results illustrate the capacity of a real time admission control to ensure more efficient resources utilization.…”

“…Some studies have considered the CAC issue in the development of OBS networks [3,4]. Nevertheless, all proposed schemes are limited to the use of mean values of some network parameters; (MVA: Mean Values Approach).…”

“…In [3], authors propose a burst admission control scheme that is based on the use of mean values of optical signal quality parameters such as signal-to-noise ratio (SNR) and bit error rate (BER). In [4], authors propose a QoS-based CAC protocol that is based on the use of mean values of two QoS parameters: the traffic loss mean rate, and the average burst blocking delay. Based on the use of mean values of some network parameters, a burst admission control scheme, may lead to false decisions in terms of traffic admission.…”