Abstract
We consider a circuit-switched multiservice network with non-hierarchical alternative
routing and trunk reservation. Based on the fundamental concept of overflow priority
classification approximation (OPCA), we develop two approximations for the estimation of the
blocking probability: OPCA and service-based OPCA. We also apply the classical Erlang fixed-point
approximation (EFPA) for the estimation of the blocking probability in the network and propose the
more conservative max (EFPA, service-based OPCA) as a reasonably accurate evaluation. We compare
the approximations with simulation results and discuss the accuracy of the blocking probabilities
for the various traffic classes under different system parameter values such as service rates,
bandwidth requirements, number of channels per trunk, maximum allowable number of alternative
paths and trunk reservation. We also discuss the robustness of the approximations to the shape of
the holding time distribution and their performances under asymmetrical cases. We illustrate that
when the approximations are used for network dimensioning, their error is acceptable. We further
demonstrate that the approximations can be applied in large networks such as the
CORONET.
© 2013 IEEE
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