Nonblocking conditions for a multicast WSW architecture based on subtree scheme for elastic optical networks

Lin, Bingkai

doi:10.1016/j.osn.2021.100660

Cited by 4 publications

(10 citation statements)

References 16 publications

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“…Extensive studies were performed based on the light-tree technology. Lin [15] enhanced a three-stage wavelength-space-wavelength node architecture to be capable of multicasting using the subtree scheme. Integer Linear Programming (ILP) formulations and algorithms were proposed for the light-tree solutions in EONs with adaptive modulation.…”

Section: A Related Workmentioning

confidence: 99%

“…3) Modulation Determination: 16) Constraints ( 14), (15), and ( 16) guarantee that an MS is assigned to an active light-trail with a transmission distance shorter than the corresponding transparent reach. Constraint (14) guarantees that an MS is assigned to an active light-trail.…”

Section: ) Flow Conservationmentioning

confidence: 99%

“…Constraint (14) guarantees that an MS is assigned to an active light-trail. Constraint (15) guarantees that the distance of a trail is the sum of the lengths of the trail links. Constraint (16) ensures that the trail distance cannot exceed the transparent reach of the assigned MS.…”

Section: ) Flow Conservationmentioning

confidence: 99%

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Coordinating Multiple Light-Trails in Multicast Elastic Optical Networks With Adaptive Modulation

Cai

Chen

et al. 2023

IEEE Photonics J.

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Optical multicasting has been considered resource efficient for multicast services. Light-tree and light-trail are two technologies that support optical multicasting while the former requires many splitters and thus experiences significant power loss. In this paper, we consider using the light-trail technology for the accommodation of multicast requests in elastic optical networks with adaptive modulation. For better spectrum efficiency, we consider accommodating each multicast by multiple light-trails. We formulate the problem by Mixed Integer Linear Programming (MILP) and propose efficient heuristic algorithms. For the impact of accommodation sequence on the algorithm performance, apart from the traditional sequence among different requests, we consider an additional sequence among the destinations of a multicast. For efficient multicast accommodation, we propose several strategies and compare their performances through a range of cases. To avoid a destination occupying excessive resources in certain cases of joining multiple light-trails, we propose an efficient algorithm to delete some duplicated destinations. Numerical results show that the proposed heuristic algorithms significantly outperform a benchmark algorithm and one performs close to the optimal MILP. Also, the algorithm for deleting certain destination replicas largely reduces the spectrum and transmitter usages, up to 41% and 20% for the cases considered, respectively.

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Section: A Related Workmentioning

confidence: 99%

Section: ) Flow Conservationmentioning

confidence: 99%

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Coordinating Multiple Light-Trails in Multicast Elastic Optical Networks With Adaptive Modulation

Cai

Chen

et al. 2023

IEEE Photonics J.

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“…Furthermore, previously established results, such as the nonblocking conditions of switching fabrics for multislot connections [14,[36][37][38][39], do not directly apply to fabrics accommodating connections in continuous slots. This necessitates the exploration of new nonblocking conditions for switching fabrics, including those designed for multicast fabrics [40][41][42][43][44].…”

Section: Introduction 1the Backgroundmentioning

confidence: 99%

“…A single connection can span m slots, where 1 m min m m max , encompassing adjacent DSUs, for example in time slots within time-division multiplexing systems. Such a connection is denoted as an m-slot connection [40][41][42][43][44]. To fully harness the transmission capabilities of telecommunication networks, it is imperative to employ adapted switching techniques.…”

Section: Introduction 1the Backgroundmentioning

confidence: 99%

Multicast Space-Conversion-Space Strict-Sense Nonblocking Switching Fabrics with Multicast Opportunity in the Last Stage for Continuous Multislot Connections

Danilewicz

2023

Electronics

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This paper introduces two nonblocking switching fabric architectures designed for multicast connections. These connections are defined using the multislot connection approach, mainly applied in elastic optical networks. In contrast to earlier solutions, this approach assumes that multislot connections are consistently established in adjacent continuous slots. This implies that previously established solutions could not be applied. Our study presents a comprehensive theoretical framework applicable to the general case of three-stage switching fabrics. These fabrics feature external stages equipped with space switches, while the middle stage incorporates conversion switches that operate in the wavelength, time, or frequency domain. In addition, multicast capabilities are deliberately confined to the output-stage switch or switches. A fundamental contribution of this work lies in the formulation of the worst-case scenario, which serves as the foundational basis for deriving strict-sense nonblocking conditions governing such multicast switching fabrics. Our analysis formally demonstrates that the fundamental structure of the multicast nonblocking switching fabric aligns closely with that of the previously examined point-to-point fabric. The only difference is related to the ability to multicast within the output stage of the switching fabric.

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Rearrangeability and repackability of a multicast wavelength-space-wavelength elastic optical network

Lin

2023

Optical Switching and Networking

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Nonblocking conditions for a multicast WSW architecture based on subtree scheme for elastic optical networks

Cited by 4 publications

References 16 publications

Coordinating Multiple Light-Trails in Multicast Elastic Optical Networks With Adaptive Modulation

Coordinating Multiple Light-Trails in Multicast Elastic Optical Networks With Adaptive Modulation

Multicast Space-Conversion-Space Strict-Sense Nonblocking Switching Fabrics with Multicast Opportunity in the Last Stage for Continuous Multislot Connections

Rearrangeability and repackability of a multicast wavelength-space-wavelength elastic optical network

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