Abstract
The elastic optical network (EON) based on the optical
orthogonal frequency-division multiplexing (O-OFDM) technology is a promising
candidate for accommodating the uncertainty and heterogeneity of the traffic
across future Internet. Advance reservation (AR) is essential to support initial-delay-tolerant
services, such as e-science and grid computing, which are making significant
contributions to the Internet traffic. Therefore, we expect that it is necessary
for future EONs to support AR requests. In this paper, we study dynamic service
provisioning of AR requests in EONs. These AR requests permit certain initial-delay
during setting-up, as long as the resources are allocated before a preset
deadline. We propose several algorithms that combine request scheduling in
the time domain with routing, modulation and spectrum assignment (RMSA) in
the spectrum domain. Specifically, with the combination of a routing path
selection policy and a request scheduling strategy, the algorithm constructs
a weight matrix for each pending AR request and provisions the request with
it. We design numerical simulations to investigate the algorithms' performance
in terms of three metrics, i.e., blocking probability, average spectrum efficiency,
and average initial-delay. Based on the simulation results and computational
complexity analysis, we provide suggestions on how to choose routing path
selection policy and request scheduling strategy for provisioning AR requests
dynamically in EONs. To the best of our knowledge, this is the first attempt
to address dynamic service provisioning of AR requests in EONs.
© 2013 IEEE
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