A Layered Subtree Scheme for Multicast Communications in Large-Scale Elastic Translucent Optical Networks

Mehdi Tarhani,Mehdi Shadaram,Morad Khosravi Eghbal

doi:10.1109/access.2020.2975621

Mehdi Tarhani, Mehdi Shadaram + Show 1 more

Open Access

https://doi.org/10.1109/access.2020.2975621

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Abstract

To exploit the capacity introduced by elastic optical networks, efficient algorithms must be developed. Efficient modulation techniques have limited reach, so for distant destination nodes, the regeneration of a signal at a few intermediary nodes along the lightpath can effectively reduce the spectrum utilization and offset the extra cost, in terms of overall transceiver use, introduced by enabling the regeneration. In the context of multicast provisioning, although regeneration can be complex, it, in turn, due to its flexibility, further emphasizes the advantage of tree based routing over serving individual destinations. In this paper, we investigate the problem of routing, modulation level, spectrum allocation, and regenerator placement (RMSA-RP) for multicast provisioning, which, to the best of our knowledge, has not been previously addressed in the literature. Accordingly, we present a networking model through comprehensive integer linear programming, jointly enabling a routing method based on a subtree scheme as well as assigning a few nodes as regenerators of the signal. By means of an algorithm, we also propose a scalable framework to address RMSA-RP when the network is in operation. This algorithm implements a dynamic and automatic geographic partitioning of the destination nodes and then forms the corresponding subtree structures. Constraints taken into account include wavelength contiguity, wavelength continuity, and light splitting that affects the reach of the modulation techniques. Extensive simulation results show that the model can effectively support a greater number of demands without increasing transceiver use.

Highlights

In recent years, many emerging applications, such as advanced weather forecasting, self-driven cars, industrial automation, online social media, and video streaming, have been facilitated using technologies such as Internet of Things and artificial intelligence
The results showed that the subtree scheme outperforms the other two schemes in terms of network capacity
The results showed that the third scenario was more successful in terms of both criteria in large-scale networks. [22] proposed a heuristic algorithm for treating RMSA and regeneration placement (RP) in pointto-point Elastic optical networks (EONs)

Summary

INTRODUCTION

Many emerging applications, such as advanced weather forecasting, self-driven cars, industrial automation, online social media, and video streaming, have been facilitated using technologies such as Internet of Things and artificial intelligence. In terms of the transmission cost, less spectrum requirements lead to lower number of required transceivers at the source and destinations, which may compensate for the extra transceivers dedicated to the regeneration of the signal This regeneration can complicate the RMSA problem, incorporating this flexibility in multicast provisioning may be advantageous and, to the best of our knowledge, has not been addressed in the literature. We formulate an integer linear programming problem to model a new subtree-based transmission structure that supports multicast networking. NETWORK MODEL In this paper, we assume a network where the nodes are connected by bidirectional fiber cables; all fiber cables are identical, and the full range of available optical spectrum in each fiber is composed of 40 contiguous frequency slices with a central wavelength spacing of 12.5 GHz. We assume a maximum of one frequency slice per transceiver, and to transmit a signal that requires more than one frequency slice, OFDM-based superchannels are allowed.

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Findings

CONCLUSION