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Published in: Photonic Network Communications 2/2021

24-08-2021 | Original Paper

A novel bandwidth allocation scheme for OTSS-enabled flex-grid intra-datacenter networks

Authors: Lin Wang, Xinbo Wang, Massimo Tornatore, Kwangjoon Kim, Biswanath Mukherjee

Published in: Photonic Network Communications | Issue 2/2021

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Abstract

Optical circuit switching networks have been recognized as a promising solution for inter-datacenter networks. However, for intra-datacenter networks, they may fall short in efficiently provisioning traffic requests due to their relatively coarse-grained channel assignment and special intra-datacenter traffic patterns. Optical time slice switching (OTSS) has been recently proposed as an optical-switching technique that can provide flexible and transparent optical circuits by extending the merit of flex-grid switching to the time domain, thus achieving much finer granularity. As OTSS requires nanosecond speed optical switches which are expensive, it might not be economically viable to make a one-time upgrade for the entire datacenter. Thus, we expect fine-grained OTSS-enabled and coarse-grained flex-grid-enabled optical switching techniques to co-exist in the foreseeable future. In this study, we investigate an OTSS-enabled flex-grid (OTSS-FG) architecture for intra-datacenter networks. For scenarios where traffic flows are given, we develop a Mixed Integer Linear Program to study the optimal bandwidth allocation scheme in an OTSS-FG architecture. When traffic flows are generated in real time, by leveraging machine-learning techniques to detect flow types, we propose a flow-aware bandwidth allocation (FABA) scheme and a dynamic version of FABA, called “D-FABA” scheme. Numerical simulations show that proposed bandwidth allocation scheme can outperform benchmark schemes in terms of average delay and blocking probability.
Footnotes
1
Generally, a traffic flow traversing multiple fibers will have propagation delay. Thus, one traffic flow should occupy different time slices on different fibers (i.e., time slice shift). Considering the short-reach optical intra-DC networks (fiber links are usually a few hundreds of meters), the time slice shift can be regarded as negligible and we do not consider propagation delay in this work.
 
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Metadata
Title
A novel bandwidth allocation scheme for OTSS-enabled flex-grid intra-datacenter networks
Authors
Lin Wang
Xinbo Wang
Massimo Tornatore
Kwangjoon Kim
Biswanath Mukherjee
Publication date
24-08-2021
Publisher
Springer US
Published in
Photonic Network Communications / Issue 2/2021
Print ISSN: 1387-974X
Electronic ISSN: 1572-8188
DOI
https://doi.org/10.1007/s11107-021-00933-z