Demonstration of Online Spectrum Defragmentation Enabled by OpenFlow in Software-Defined Elastic Optical Networks

Ma, Shoujiang; Chen, Cen; Li, Shengru; Zhang, Mingyang; Li, Suoheng; Shao, Yan; Zhu, Zuqing; Liu, Lei; Yoo, S. J. B.

doi:10.1364/ofc.2014.w4a.2

Cited by 23 publications

(9 citation statements)

References 2 publications

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“…In particular, the experiments demonstrated, in a testbed, the dynamic allocation of spectrum slots and adoption of modulation formats from 16-QAM to QPSK at 100 Gb/s, and bit-rate adaptation with 16-QAM from 200 Gb/s to 100 Gb/s. Finally, S. Ma et al [106] have presented and experimentally demonstrated a control-plane framework to realize online spectrum defragmentation in software-defined elastic optical networks in order to reduce the call blocking probability in the network.…”

Section: G Networking Cost Of Sbvtmentioning

confidence: 99%

“…However, the practical implementation of the elastic optical network remains in development, and the full commercial deployment of the elastic optical network will be seen in the next few years. [102], [110], [112] Defragmentation [106], [113], [114] X. RESEARCH ISSUES AND CHALLENGES Flex-grid technology or elastic optical network is a promising concept but its implementation remains some way off.…”

Section: G Networking Cost Of Sbvtmentioning

confidence: 99%

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Routing and Spectrum Allocation in Elastic Optical Networks: A Tutorial

Chatterjee

Sarma

Oki

2015

IEEE Commun. Surv. Tutorials

601

240

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Flexgrid technology is now considered to be a promising solution for future high-speed network design. In this context, we need a tutorial that covers the key aspects of elastic optical networks. This tutorial paper starts with a brief introduction of the elastic optical network and its unique characteristics. The paper then moves to the architecture of the elastic optical network and its operation principle. To complete the discussion of network architecture, this paper focuses on the different node architectures, and compares their performance in terms of scalability and flexibility. Thereafter, this paper reviews and classifies routing and spectrum allocation (RSA) approaches including their pros and cons. Furthermore, various aspects, namely -fragmentation, modulation, quality-of-transmission, traffic grooming, survivability, energy saving, and networking cost related to RSA, are presented. Finally, the paper explores the experimental demonstrations that have tested the functionality of the elastic optical network, and follows that with the research challenges and open issues posed by flexible networks.Index Terms-Elastic optical networks, node architecture, spectrum management, routing and spectrum allocation, and sliceable bandwidth-variable transponder.

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Section: G Networking Cost Of Sbvtmentioning

confidence: 99%

Section: G Networking Cost Of Sbvtmentioning

confidence: 99%

Routing and Spectrum Allocation in Elastic Optical Networks: A Tutorial

Chatterjee

Sarma

Oki

2015

IEEE Commun. Surv. Tutorials

601

240

View full text Add to dashboard Cite

show abstract

“…5 shows the optical spectrum on links 6-8 and 1-8 before and after the re-optimization is performed. PCRpt responses are generated when the requested actions have been performed (messages [4][5]. When the solution computed by the bPCE has been completely deployed, the fPCE confirms the ABNO controller the end of the requested re-optimization by sending a PCRep message (6).…”

Section: B Experimental Assessmentmentioning

confidence: 99%

“…Some previous works have experimentally demonstrated in-operation flexgrid network planning use cases, such as spectrum defragmentation, using a SDN controller [5] or a PCE [6]. Notwithstanding, the IETF is currently defining the Application-Based Network Operations (ABNO) architecture [7] to implement complex workflows and compute time consuming optimization algorithms.…”

Section: Introductionmentioning

confidence: 99%

First Experimental Assessment of ABNO-Driven In-Operation Flexgrid Network Re-Optimization

Gifre

Paolucci

Velasco

et al. 2015

J. Lightwave Technol.

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Abstract-Traffic affected by link failures can be recovered using path restoration schemes. In dynamically operated networks provided with a control plane, restoration algorithms run in a centralized element, such as the Path Computation Element (PCE). To increase traffic restorability in flexgrid networks, multiple paths, sub-connections, can be used to restore every single affected connection. However, the multipath restoration scheme might result in a poor resource utilization entailing a lesser grade of service. In-operation network planning algorithms can be used to mitigate this problem once the failed link is repaired; we propose solving the so-called multipath after failure repair optimization problem (MP-AFRO) to reduce sub-connections count by aggregating those belonging to the same original connection and re-routing the resulting connection to release spectral resources. The MP-AFRO problem is modelled using a Mixed Integer Linear Program (MILP) formulation. In view of the complexity of the model and the limited time to solve the problem, we propose a heuristic algorithm that provides a good trade-off between complexity and optimality. The performance on the MP-AFRO heuristic is firstly validated by simulation. Next, the heuristic algorithm is deployed inside an in-operation planning tool in the form of back-end PCE (bPCE) inside the Application-based Network Operations (ABNO) architecture controlling a network; the bPCE is connected to the centralized active stateful PCE. MP-AFRO is experimentally demonstrated using a distributed field trial test-bed connecting the premises of Telefonica (Madrid), CNIT (Pisa), and UPC (Barcelona).

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“…A proposta mostra a viabilidade do ajuste dinâmico do espectro através do uso do protocolo OpenFlow. Em [107] os autores apresentam um framework para o plano de controle baseado em SDN que realiza a desfragmentação online do espectro. Os resultados mostraram uma redução significativa na probabilidade de bloqueio da rede.…”

Section: Tecnologia Do Plano De Controleunclassified

Potencializando a modulação adaptativa com roteamento em múltiplos saltos em redes ópticas elásticas

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Demonstration of Online Spectrum Defragmentation Enabled by OpenFlow in Software-Defined Elastic Optical Networks

Cited by 23 publications

References 2 publications

Routing and Spectrum Allocation in Elastic Optical Networks: A Tutorial

Routing and Spectrum Allocation in Elastic Optical Networks: A Tutorial

First Experimental Assessment of ABNO-Driven In-Operation Flexgrid Network Re-Optimization

Potencializando a modulação adaptativa com roteamento em múltiplos saltos em redes ópticas elásticas

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