Abstract
Feature Issue on
Optical Wireless Communications (OWC)
Weather conditions have a
significant impact on availability of free-space optical (FSO) access networks.
Under fair weather conditions, such networks can use long-range FSO links that span
over 1 km. Under severe weather conditions, e.g., dense fog, only the short-range
FSO links in the range of 200–400m remain operational. We propose an
availability-differentiated networking scheme that supports two classes of service
availability in an FSO network consisting of both long-range and short-range FSO
links. Under severe weather conditions, the network topology is reconfigured to use
only the short-range FSO links. Owing to the reduced network capacity in the
reconfigured network, lower-availability services (LAS) will be preempted by
higher-availability services (HAS). LAS and HAS have different revenue values. Given
a set of hybrid LAS and HAS requests, we maximize the total revenue of LAS + HAS by
selectively provisioning a portion of the service requests in the FSO access
network. We formulate the problem into a common terminal multicommodity problem and
develop an optimal algorithm to solve this problem in polynomial time.
© 2005 Optical Society of America
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