Elastic Optical Networking for 5G Transport

Boutaba, Raouf; Shahriar, Nashid; Fathi, Siavash

doi:10.1007/s10922-017-9434-z

Cited by 29 publications

(14 citation statements)

References 64 publications

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“…b) VLink demand constraints: We provision a VLink by splitting it across multiple (up to q) SPaths. Constraint (5) ensures that for each VLinkē ∈Ē, the sum of data-rates resulting from applying the selected transmission configuration on the selected paths is equal to the VLink's demand. Then, (6) enforces an upper limit on the number of splits.…”

Section: A Decision Variablesmentioning

confidence: 99%

“…In addition, emerging transponder technologies such as bandwidth variable transponders and multi-flow transponders offer unprecedented capability of transmitting and receiving a traffic demand into multiple elastic optical flows, operating at independent bit rates, that can be routed independently [4]. This new generation of optical networks is usually referred to as Elastic Optical Networks (EONs) [3], [5].…”

Section: Introductionmentioning

confidence: 99%

“…EON virtualization is currently gaining interest, especially because of its importance in future 5G network slicing [5]. A core problem in EON virtualization is to efficiently map a virtual network on the substrate optical network, also known as the Virtual Network Embedding (VNE) problem [6].…”

Section: Introductionmentioning

confidence: 99%

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Achieving a Fully-Flexible Virtual Network Embedding in Elastic Optical Networks

Shahriar

Taeb

Chowdhury

et al. 2019

IEEE INFOCOM 2019 - IEEE Conference on Computer Communications

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Network operators must continuously scale the capacity of their optical backbone networks to keep apace with the proliferation of bandwidth-intensive applications. Today's optical networks are designed to carry large traffic aggregates with coarse-grained resource allocation, and are not adequate for maximizing utilization of the expensive optical substrate. Elastic Optical Network (EON) is an emerging technology that facilitates flexible allocation of fiber spectrum by leveraging finer-grained channel spacing, tunable modulation formats and Forward Error Correction (FEC) overheads, and baud-rate assignment, to right size spectrum allocation to customer needs. Virtual Network Embedding (VNE) over EON has been a recent topic of interest due to its importance for 5G network slicing. However, the problem has not yet been addressed while simultaneously considering the full flexibility offered by an EON. In this paper, we present an optimization model that solves the VNE problem over EON when lightpath configurations can be chosen among a large (and practical) set of combinations of paths, modulation formats, FEC overheads and baud rates. The VNE over EON problem is solved in its splittable version, which significantly increases problem complexity, but is much more likely to return a feasible solution. Given the intractability of the optimal solution, we propose a heuristic to solve larger problem instances. Key results from extensive simulations are: (i) a fully-flexible VNE can save up to 60% spectrum resources compared to that where no flexibility is exploited, and (ii) solutions of our heuristic fall in more than 90% of the cases, within 5% of the optimal solution, while executing several orders of magnitude faster.

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Section: A Decision Variablesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Achieving a Fully-Flexible Virtual Network Embedding in Elastic Optical Networks

Shahriar

Taeb

Chowdhury

et al. 2019

IEEE INFOCOM 2019 - IEEE Conference on Computer Communications

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“…Traditional "fixed grid" optical networks have been for a long time a dominant technology in the transport segment thanks to their high-bandwidth and low-latency. Recently, network operators are adopting Elastic Optical Networks (EONs) to overcome the limitations of fixed grid networks, such as inflexible and coarse-grained resource allocation [20], [21]. EONs have the capability to allocate an arbitrary number of spectrum slices for right-size spectrum allocation to customer needs (i.e., EONs employ a flexible grid, as opposed to the traditional fixed grid, to allocate optical spectrum slices).…”

Section: Introductionmentioning

confidence: 99%

“…EON virtualization has recently garnered interest from the research community, especially due to its importance in 5G network slicing [21]. VNE over EON introduces unique challenges arising from the large number of configurable transmission parameters available in EONs [26].…”

Section: Introductionmentioning

confidence: 99%

Virtual Network Embedding with Path-based Latency Guarantees in Elastic Optical Networks

Taeb

Shahriar

Chowdhury

et al. 2019

2019 IEEE 27th International Conference on Network Protocols (ICNP)

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Elastic Optical Network (EON) virtualization has recently emerged as an enabling technology for 5G network slicing. A fundamental problem in EON slicing (known as Virtual Network Embedding (VNE)) is how to efficiently map a virtual network (VN) on a substrate EON characterized by elastic transponders and flexible grid. Since a number of 5G services will have strict latency requirements, the VNE problem in EONs must be solved while guaranteeing latency targets. In existing literature, latency has always been modeled as a constraint applied on the virtual links of the VN. In contrast, we argue in favor of an alternate modeling that constrains the latency of virtual paths. Constraining latency over virtual paths (vs. over virtual links) poses additional modeling and algorithmic challenges to the VNE problem, but allows us to capture end-toend service requirements. In this paper, we first model latency in an EON by identifying the different factors that contribute to it. We formulate the VNE problem with latency guarantees as an Integer Linear Program (ILP) and propose a heuristic solution that can scale to large problem instances. We evaluated our proposed solutions using real network topologies and realistic transmission configurations under different scenarios and observed that, for a given VN request, latency constraints can be guaranteed by accepting a modest increase in network resource utilization. Latency constraints instead showed a higher impact on VN blocking ratio in dynamic scenarios.

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Development of Optical Networking for5G Smart Infrastructures

Miladić-Tešić

Marković

2021

5th EAI International Conference on Management of Manufacturing Systems

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Elastic Optical Networking for 5G Transport

Cited by 29 publications

References 64 publications

Achieving a Fully-Flexible Virtual Network Embedding in Elastic Optical Networks

Achieving a Fully-Flexible Virtual Network Embedding in Elastic Optical Networks

Virtual Network Embedding with Path-based Latency Guarantees in Elastic Optical Networks

Development of Optical Networking for5G Smart Infrastructures

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