Abstract
Empowered by the optical orthogonal frequency-division multiplexing
(O-OFDM) technology, flexible online service provisioning can be realized
with dynamic routing, modulation, and spectrum assignment (RMSA). In this
paper, we propose several online service provisioning algorithms that incorporate
dynamic RMSA with a hybrid single-/multi-path routing (HSMR) scheme. We investigate
two types of HSMR schemes, namely HSMR using online path computation (HSMR-OPC)
and HSMR using fixed path sets (HSMR-FPS). Moreover, for HSMR-FPS, we analyze
several path selection policies to optimize the design. We evaluate the proposed
algorithms with numerical simulations using a Poisson traffic model and two
mesh network topologies. The simulation results have demonstrated that the
proposed HSMR schemes can effectively reduce the bandwidth blocking probability
(BBP) of dynamic RMSA, as compared to two benchmark algorithms that use single-path
routing and split spectrum. Our simulation results suggest that HSMR-OPC can
achieve the lowest BBP among all HSMR schemes. This is attributed to the fact
that HSMR-OPC optimizes routing paths for each request on the fly with considerations
of both bandwidth utilizations and lengths of links. Our simulation results
also indicate that the HSMR-FPS scheme that use the largest slots-over-square-of-hops
first path-selection policy obtains the lowest BBP among all HSMR-FPS schemes.
We then investigate the proposed algorithms' impacts on other network performance
metrics, including network throughput and network bandwidth fragmentation
ratio. To the best of our knowledge, this is the first attempt to consider
dynamic RMSA based on both online path computation and offline path computation
with various path selection policies for multipath provisioning in O-OFDM
networks.
© 2012 IEEE
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