Abstract
In this paper, we present a novel labeling scheme to provide multiservice
path switching in a generalized multiprotocol label switching (GMPLS) network.
The idea is based on optical code division multiplexing (OCDM) scheme in GMPLS
network using multilength variable-weight optical orthogonal codes (MLVW-OOC)
as signature sequences. The router architecture of the proposed multiservice
GMPLS network is also presented. To provide a requested service, the length
and the weight of codes are designed based on the service characteristics.
Furthermore, to guarantee the desired service, we propose to limit the number
of connections based on the activity coefficient of the connected paths. In
order to analyze the network performance, the end-to-end bit error rate $(e-e\ {\rm BER})$ of
a connection and the probability of QoS degradation $(P_{\rm deg})$ are considered as benchmarks.
To obtain the $e-e\ {\rm
BER}$ of the connected path, a closed-form relation describing
the BER of the MLVW-OOC-based OCDM system is derived, and the Erlang's
model is used to examine the $P_{\rm deg}$. As a case study, a four-class
network is designed with the proposed labeling scheme and the performance
of each class is investigated. The numerical results reveal that users with
high-weight codeword acquire better performance. Furthermore, by increasing
the number of intermediate routers, the $e-e\ {\rm BER}$ is increased and the performance
can be improved by limiting the number of connected paths.
© 2009 IEEE
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