Abstract
In this paper, we propose a hybrid network architecture, called Content-based Switching Network (CSN), and its signaling scheme, which addresses the issues inherent to conventional hybrid networks which implement a horizontal separation over the entire network (from edge to edge). We will show how CSN nodes can flexibly choose their switching paradigm (store-and-forward, optical bypass, electrical bypass) during a path establishment. Contents being transferred in one piece from end-to-end, the concept of packet can be eluded in our network, and, in particular, the user is able to avoid complicated transport layer functions, like TCP, if they are not essential. In CSN, very large contents have a special status, since they cannot be store-and-forwarded. We will show how the resource management has been designed in order to deal with such contents. A section is dedicated to deployment and feasibility issues. Simulation results will show that CSN can successfully transfer contents at 1 Gbps and 10 Gbps, the maximum speed being limited by the state-of-the-art device technologies when buffering is required (memory speed), while no major limit is observed in the case of all-optical transfers other than the optical fiber speed. Other results concern the deployment of CSN from an unclean slate approach. They will show how beneficial can be the deployment of CSN from an Optical Circuit Switching network.
Highlights
Future networks will have to face a traffic implosion due to, for instance, the transmission of ultra high definition videos (4K, 8K) or the next-generation 3D and holographic imaging [1]
We propose in this paper a hybrid network, called Content-based Switching Network (CSN), which can be considered as a fusion of Optical Circuit Switching (OCS) and store-and-forward based switching networks
Each node can perform an OEO conversion on the fly for a specific content if needed, solving the questions of when and where a translucent bridge should be made. This virtually maximizes the merit of the optical transmission, in contrast to usual packet-switching networks which forcibly buffer the content at each node while the header is checked, introducing undesirable latency
Summary
Future networks will have to face a traffic implosion due to, for instance, the transmission of ultra high definition videos (4K, 8K) or the next-generation 3D and holographic imaging [1]. This leads to a network which is able to dynamically adapt itself to the demand. Each node can perform an OEO conversion on the fly for a specific content if needed (resource shortage, physical impairments), solving the questions of when and where a translucent bridge should be made. This virtually maximizes the merit of the optical transmission, in contrast to usual packet-switching networks which forcibly buffer the content at each node while the header is checked, introducing undesirable latency.
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