We present a formal protocol description for a Just-In-Time
(JIT) signaling scheme running over a core dWDM network which utilizes
Optical Burst Switches (OBS). We apply an eight-tuple extended finite
state machine (EFSM) model to formally specify the protocol. Using
the EFSM model, we define the communication between a source client
node and a destination client node through an ingress and one or multiple
intermediate switches. We worked on single burst connections that
means setting up the connection just before sending a single burst
and then closing the connection as soon as the burst is sent. The
communication between the EFSMs is handled through message transfer
between protocol entities.
We study the issues arising when considering the problem of reconfiguring broadcast optical networks in response to changes in the traffic patterns. Although the ability to dynamically optimize the network under changing traffic conditions has been recognized as one of the key features of multiwavelength optical networks, this is the first in-depth study of the tradeoffs involved in carrying out the reconfiguration process. We first identify the degree of local balancing and the number of retunings as two important, albeit conflicting, objectives in the design of reconfiguration policies. We then formulate the problem as a Markovian Decision Process and we develop a systematic and flexible framework in which to view and contrast reconfiguration policies. We also apply results from Markov Decision Process theory to obtain optimal reconfiguration policies even for networks of large size. The advantages of optimal policies over a class of threshold-based policies are also illustrated through numerical results.
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