Abstract
In Polymorphous Optical Burst-Switched (POBS) networks, the Burst Control
Packets (BCPs) of conventional Just-Enough-Time based signalling OBS networks
are given extended properties which enable them not only to reserve fixed
time-slots for asynchronous data bursts, but also to allocate TDM reservations
for periodic streams of data, and even a complete wavelength for high-bandwidth
demanding services. This allows POBS to provide a flexible, yet transparent,
approach for supporting the idiosyncrasies of today's most popular services
over the same underlying network architecture. In POBS, the spare gaps in
between synchronous TDM reservations can be used for the allocation of best-effort
data bursts, leading to a more efficient utilisation of the optical capacity.This work shows how to extend the well-known Erlang Fixed Point procedure
to evaluate the performance behavior of POBS networks, whereby asynchronous
data bursts coexist with high-priority periodic TDM reservations. The performance
evaluation algorithm is applied to a number of case scenarios, showing the
benefits arisen due to the flexibility of POBS networks.
© 2009 IEEE
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