Abstract
In this paper, a QoS differentiation framework is proposed for an optical
burst switching (OBS) multiservice network. Furthermore, hybrid wavelength
division multiplexing and optical code division multiplexing (WDM/OCDM) scheme
is used to mitigate the blocking probability of OBS networks. In our study,
the measurement criteria of QoS are the blocking probability, OBS network
delay, transmission rate, and OCDM probability of error. In order to increase
the bandwidth efficiency and control the multiplexing interference effect
of OCDM, an advanced optical resource allocation strategy is introduced. The
proposed strategy is also compared with a conventional strategy based on random
allocation. The comparison shows the superiority of our technique. The blocking
probability of the proposed WDM/OCDM-based OBS scheme is evaluated by utilizing
both the generalized Engset model and 2-D Markov model. The effect of multiplexing
interference is also investigated in computing the probabilities of error
and outage. Additionally, an upper bound on the OBS network delay is derived
by computing the expected values of burst assembly and burst transmission
queuing delay. To proceed further, a four-class OBS network is numerically
designed to explain the details of QoS differentiation framework and to highlight
the advantages of the proposed scheme. Numerical results reveal that by using
hybrid WDM/OCDM technique, the blocking probability of OBS networks is significantly
reduced. Moreover, the probabilities of error and outage are reduced employing
intelligent resource allocation.
© 2012 IEEE
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