Abstract
In this paper, we investigate the problem of transmission grant scheduling
in multichannel optical access networks using a scheduling theoretic
approach. A novel cost-effective multichannel Ethernet passive optical
network (EPON) is considered for our study. We show that the problem can be
modeled as an open shop (OS) and we formulate the joint scheduling and
wavelength assignment problem as a mixed integer linear program (MILP).
Since the problem is shown to be NP-hard, we introduce a tabu-search-based
heuristic for solving the joint problem. Different other heuristics are also
considered and their performances are compared with those of tabu and MILP.
Results indicate that by appropriately scheduling transmission grants and
assigning wavelengths, substantial and consistent improvements may be
obtained in the network performance. For example, tabu shows a reduction of
up to 29% in the schedule length with substantial reduction in channel idle
gaps yielding to both higher channel utilization and lower queueing delays.
Additionally, when the number of channels in the network is not small, the
benefits of performing appropriate wavelength assignment, together with
transmission scheduling, are observed and discussed. We further perform a
packet-level simulation on the considered network to study the benefits of
efficient grant scheduling.
© 2009 IEEE
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