Abstract
From the network layer perspective, the problem of burst losses is one
of the most challenging problems which restrain the development of optical
burst switching (OBS) networks. Indeed, OBS is a buffer-less technology and
the consequent lack of guarantees for data delivery may affect significantly
the quality of service (QoS) perceived by end users. To overcome these obstacles,
dedicated network mechanisms and design methods are required for QoS provisioning
in the network. With this end in view, in this paper, we present a traffic
engineering (TE) approach to support the end-to-end traffic delivery with
absolute QoS guarantees, in terms of burst losses, in an OBS network. We focus
on the establishment of explicit routing paths and minimum allocation of wavelength
resources in network links under the requirement that certain absolute level
of burst loss probability for a given set of traffic demands is guaranteed.
In this paper, we call such an off-line problem the virtual topology (VT)
design problem. Since the VT design problem is <i>NP</i>-complete, as an alternative
to the mixed integer linear programming formulation, we develop a local search
heuristic algorithm to solve it. Moreover, we focus on a dynamic OBS network
scenario, where the offered traffic is subject to a change. In this context,
we propose an on-line VT maintenance mechanism that is responsible for traffic
admission control and adaptation of the VT to traffic changes. Eventually,
proposed algorithms and mechanisms for the TE-driven end-to-end QoS approach
are verified both numerically and by means of network simulations for a number
of network scenarios.
© 2011 IEEE
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