Abstract
In this paper, we propose a new scheme to provide multiservice transmission on
generalized multiprotocol label switching (GMPLS) networks using optical code-division
multiplexing (OCDM) in each wavelength of a wavelength-division multiplexing system. To
provide multiservice transmission in a typical GMPLS network, we propose to classify the
fiber bandwidth into a number of waveband and consider the wavelengths of each waveband
for a specific class-of-service such that the corresponding codes to be used are
designed based on the characteristics of the class-of-service. The traffic behavior of
the network is examined using Erlang's model, and the probability density functions
(PDF) of the number of occupied labels in a link are obtained. To evaluate the PDF of
the number of occupied labels in each wavelength, two scenarios are considered: path
establishment without traffic management and path establishment with traffic management.
In the first scenario, connected paths are divided among wavelengths randomly; while in
the second scenario, a controlling mechanism manages distribution of the connected paths
so that all wavelengths have the same number of connected paths. To analyze the
performance of the system, end-to-end bit error rate, probability of outage, and
blocking probability are investigated. The obtained results reveal that path
establishment with traffic management results in better performance. Furthermore, to
guarantee the desired quality of service (QoS), a controlling mechanism is proposed to
limit the number of connected paths based on the activity coefficient of the
connections. We show that using such controlling mechanism the desired QoS is
guaranteed.
© 2009 IEEE
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