Bandwidth reservation in Optical WDM/TDM star networks

TitleBandwidth reservation in Optical WDM/TDM star networks
Publication TypeConference Proceedings
Year of Publication2004
AuthorsSaberi, N., and M. J. Coates
Conference Name22nd Biennial Symposium on Communications
Date Published06/2004
Conference LocationKingston, ON, Canada

In this paper, we propose an off-line scheduling algorithm for an optical TDM/WDM star network composed of a non-blocking optical central switch and a set of edge switches, each capable of simultaneously transmitting (and receiving) at several different wavelengths. We implement a scheduling algorithm, which assigns a cost to each time slot destined to a particular destination and attempts to allocate each request a set of time slots with the lowest cost. This strategy provides low rejection probability for future requests. In order to reduce the signaling bandwidth and the computation complexity we require the scheduler to preserve the allocation of the existing connections by modifying the schedule for only the changes in the traffic request. For deallocating the terminating connections we propose two different techniques, with different performance and complexity. Then we enhance the performance of the simpler technique with a modification to the scheduling algorithm, which should be performed only for scheduling the first frame.

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