Abstract
In most existing studies of optical burst-switched networks, adaptive
routing is based on deflection routing and/or feedback from the past intervals
which often introduces excessive transmission delay and architectural complexity.
Our proposed novel adaptive routing schemes, however, consider the transient
link congestion at the moment when the bursts arrive and have potential to
reduce the overall burst loss probability. Moreover, they can utilize the
same offset times for the same node pairs implying zero additional transmission
delay and simplicity. The proposed hop-by-hop routing schemes also aim to
address the intrinsic unfairness defect of existing popular signaling protocols
by increasing the effective link utilization. The results show that the proposed
schemes generally outperform shortest path routing and depending on the routing
strategy involved, the network topology and the traffic load, this improvement
can be substantial. We develop analytical loss models to demonstrate the need
for such an adaptive routing scheme at each hop and show its effectiveness.
We also verify the analytical results by simulation.
© 2009 IEEE
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