Column generation algorithm for RSA problems in flexgrid optical networks

Ruiz, Marc; Pióro, Michał; Żotkiewicz, Mateusz; Klinkowski, Mirosław; Velasco, Luis

doi:10.1007/s11107-013-0408-0

Cited by 54 publications

(38 citation statements)

References 13 publications

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“…The size of the problem can be reduced and solved to optimality using large scale optimization techniques, such as column generation [35]. In this paper, however, a heuristic algorithm is proposed.…”

Section: Cp-vnt_create Problemmentioning

confidence: 99%

ABNO-driven content distribution in the telecom cloud

Gifre

Tornatore

Contreras

et al. 2017

Optical Switching and Networking

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Abstract-As current sustained traffic growth is expected to strain capacity of today's metro network, novel content distribution architectures where contents are placed closer to the users are being investigated. In that regard, telecom operators can deploy datacenters (DCs) in metro areas, thus reducing the impact of the traffic going from users to DCs. However, effective solutions to distribute contents to those metro DCs and to synchronize contents among them need to be investigated. In this paper, a hierarchical content distribution architecture for the telecom cloud is investigated: core DCs placed in geographically distributed locations, are interconnected through permanent "per content provider" (CP) virtual network topology (CP-VNT); additionally, metro DCs are placed close to users, and need also to be interconnected with the core DCs. CP's data is replicated in the core DCs through the CP-VNT, while metro-to-core (M2C) anycast connections are established periodically for metro DCs to synchronize contents. Since failures in the interconnection network might disconnect the CP-VNTs, in this paper recovery mechanisms are proposed to reconnect topologies and anycast connections. Topology creation, anycast provisioning and recovery problems are first formally stated and modelled as Integer Linear Programs (ILP). Solving these models, however, becomes impractical for realsized scenarios, so heuristic algorithms are also proposed. Exhaustive simulation results show that the investigated architecture provides significant improvements in both supported traffic and restorability compared to the case of a single core DC. Workflows to implement the algorithms within the Applications-based Network Operations (ABNO) architecture and extensions for PCEP are proposed. Finally, the architecture is experimentally validated in our ABNObased iONE test-bed.Keywords: Datacenter interconnection, Optical networks, Content distribution. INTRODUCTIONCloud-based contents are experiencing an exponential growth in users and data volume. In [1], Cisco forecast a yearly global growth of 23% in datacenter (DC)-to-user traffic, 29% in DC-to-DC traffic, and 22% in the intra-DC traffic. Likewise, Alcatel-Lucent highlights that metro traffic will increase 560% by 2017 mainly driven by IP video and cloud traffic [2], growing two times faster than core network traffic. They conclude that placing contents in DCs closer to users can result in a 41% bandwidth reduction in the metro networks. The resulting distributed DC architecture should come together with the extension of the core network functionalities towards the metro, as proposed in [3].Robust telecom infrastructures are needed to minimize the impact of failures on the services [4]; this is especially relevant in the case of video distribution. In fact, prolonged service outages and disruptions have negatively impacted the confidence of important companies toward cloud environments. Telecom operators are in a vantage position to capitalize on highly-reliable cloud services since they o...

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Section: Cp-vnt_create Problemmentioning

confidence: 99%

ABNO-driven content distribution in the telecom cloud

Gifre

Tornatore

Contreras

et al. 2017

Optical Switching and Networking

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“…Objective: minimize the total number of used slices so that every lightpath in P* has a new route containing e r . In order to effectively solve AFRO for real networks with hundreds of lightpaths, we have designed a specific column generation algorithm based on the work recently proposed in [6]. In short, the column generation algorithm allows near-optimal solving Mixed Integer Programming (MIP) formulations for the RSAbased problems in an affordable way, by considering a reduced set of problem variables (corresponding to the lightpaths) without significantly affecting the quality of the obtained solution.…”

Section: After Failure Repair Optimizationmentioning

confidence: 99%

“…Such features as fine spectrum granularity (a result of dividing the spectrum into narrow frequency slices, e.g., 6.25 GHz), advanced optical modulation formats, and filtering and signal processing, constitute the basis for introducing flexibility and elasticity to network operation [2].…”

Section: Introductionmentioning

confidence: 99%

After Failure Repair Optimization in Dynamic Flexgrid Optical Networks

Ruiz

Żotkiewicz

Castro

et al. 2014

Optical Fiber Communication Conference

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“…Hence, some large-scale optimization approaches are necessary. Here, the column generation (CG) technique seems to be a promising approach, since it has been successfully applied to different optimization problems (Klinkowski et al, 2016;Ruiz et al, 2013;Żotkiewicz et al, 2015).…”

Section: Introdutionmentioning

confidence: 99%

“…Klinkowski et al (2016), Ruiz et al (2013) or Velasco et al (2014) focus on efficient methods to solve the problem of allocating unicast demands in an unprotected EON. It is worth mentioning that Ruiz et al (2013) and Velasco et al (2014) apply the CG technique directly to solve RSA while Klinkowski et al (2016) propose a branch-and-price approach that incorporates, among others, CG. Next, focus on optimization of anycast traffic in an unprotected EON wherein they model an anycast demand as a one-directional transmission from a DC to the client node.…”

mentioning

confidence: 99%

A column generation technique for routing and spectrum allocation in cloud–ready survivable elastic optical networks

Goścień

Walkowiak

2017

International Journal of Applied Mathematics and Computer Science

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Driven by increasing user requirements and expectations, the fast development of telecommunications networks brings new challenging optimization problems. One of them is routing and spectrum allocation (RSA) of three types of network flows (unicast, anycast, multicast) in elastic optical networks (EONs) implementing dedicated path protection (DPP). In the paper, we model this problem as integer linear programming (ILP) and we introduce two new optimization approaches-a dedicated heuristic algorithm and a column generation (CG)-based method. Then, relying on extensive simulations, we compare algorithm performance with reference methods and evaluate CG efficiency in detail. The results show that the proposed CG method significantly outperforms reference algorithms and achieves results very close to optimal ones (the average distance to optimal results was at most 2.1%).

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Column generation algorithm for RSA problems in flexgrid optical networks

Cited by 54 publications

References 13 publications

ABNO-driven content distribution in the telecom cloud

ABNO-driven content distribution in the telecom cloud

After Failure Repair Optimization in Dynamic Flexgrid Optical Networks

A column generation technique for routing and spectrum allocation in cloud–ready survivable elastic optical networks

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