Abstract
Optical wavelength-division-multiplexing (WDM) networks have emerged as an
ideal backbone for the dynamic transport of bandwidth-intensive
applications. Most emerging applications require end-to-end survivable
connections to be set up for specific time durations that have sliding or
fixed setup times (such as IPTV, grid computing backup storage). It is
critical for the development of future network infrastructure that
user-centric, dynamic, and end-to-end management and control mechanisms are
devised to bridge the gap between the transport capacity and the needs of
new applications at the customer edges. In this paper, we study the problem
of dynamic provisioning of user-controlled connection requests that have
specified holding times and delay tolerances. Delay tolerance is a measure
of customer patience, and it is defined as the duration a connection request
can be held until it is set up. A connection that cannot be established at
the instant of its request could potentially be set up in the remaining
duration of its delay tolerance. In this study, different dynamic scheduling
algorithms are developed and compared by giving priority to connections
according to their arrival rates, delay tolerances, and holding times. Using
a mathematical model for impatient requests and simulation experiments, we
show that delay tolerance flexibility in the traffic model provides a
reduction of up to 50% on blocking probability, without the use of extra
backup capacity.
© 2010 IEEE
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