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1 International Journal of Electronics and Telecommunications

1 2020

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Combinatorial Properties and Defragmentation Algorithms in WSW1 Switching Fabrics

Rajewski Remigiusz, Kabaciński Wojciech, Al-Tameemi Atyaf

International Journal of Electronics and Telecommunications

2020

Vol. 66, No. 1

99--105

A spectrum defragmentation problem in elastic optical networks was considered under the assumption that all connections can be realized in switching nodes. But this assumption is true only when the switching fabric has appropriate combinatorial properties. In this paper, we consider a defragmentation problem in one architecture of wavelength-space-wavelength switching fabrics. First, we discuss the requirements for this switching fabric, below which defragmentation does not always end with success. Then, we propose defragmentation algorithms and evaluate them by simulation. The results show that proposed algorithms can increase the number of connections realized in the switching fabric and reduce the loss probability.