Electronic architectures of optical slot switching nodes

International audienceAn optical slot switching node network called POADM (packet optical add-drop multiplexers) has formerly been proposed as a flexible solution for metropolitan ring networks to carry data traffic with a sub-wavelength switching granularity and with a good energy efficiency, which is enabled by optical transparency. In this paper, we propose several architectures for the electronic side of optical slot switching nodes. Those architectures increase the flexibility with which a client, attached to a node, can access the transport medium, through the addition of electronic switches, working either at client frame granularity or at slot granularity (a slot encapsulates several client frames); such electronic switches can be located at either transmitter, receiver, or both sides of a node, thereby decreasing traffic latency, at the expense of increased node cost and/or energy consumption. This paper focuses on the latency aspect only. We assess and compare the latency of these node architectures with simulations; some results are also backed analytically. The utilization of an (electronic) slot switch enables load balancing across the transport channels, while the node architecture with an (electronic) client frame switch additionally permits flow aggregation, resulting in lower queuing delay. The lowest queuing delay is achieved by the architecture embedding client frame switches at both transmitter (Tx) and receiver (Rx) sides, while the absence of electrical switches leads to the worst performance, but presents the advantage of lower cost and consumption with respect to the other architectures. The utilization of client frame switches at Tx or Rx presents intermediate performances

Optical Slot Switching Latency in Mobile Backhaul Networks

International audienceWe show that an optical slot switching network fulfills the strict latency constraints of a next generation LTE advanced switching mobile backhaul network. The impact of class-of-service handling when aggregating client data into slots is also quantified. Introduction With the evolution of the optical transport technologies, energy-efficient solutions for the transport in the radio access part of cellular backhaul networks have become available. In this paper, we consider the use of fine granularity optical transport solutions – optical slot switching (OSS), an energy-efficient switching technolog

Mobility support in optical slot switching-based next-generation mobile backhaul networks

International audienceWe propose a new CoS-aware mechanism to support User-Element mobility at optical layer in optical slot switching-based next-generation mobile backhaul network. This new mechanism allows supporting 30% additional network load and up to halves latency compared with naive mechanism. Introduction With the evolution of the optical transport technologies, energy-efficient solutions for the transport in the radio access part of cellular backhaul networks have become available. In this paper, we consider the use of a fine granularity optical transport solution: optical slot switching (OSS), an energy-efficien

Impact of the Electronic Architecture of Optical Slot Switching Nodes on Latency in Ring Networks

International audienceOptical slot switching has formerly been proposed as a flexible solution for metropolitan ring networks to carry data traffic with a sub-wavelength switching granularity and with a good energy efficiency, which is enabled by optical transparency. In this paper, for the first time we propose several architectures for the electronic side of optical slot switching nodes to increase flexibility through the addition of electronic switches, working either at client packet granularity or at slot granularity; such electronic switches can be located at either transmitter side, receiver side, or both sides of a node, thereby decreasing traffic latency, at the expense of increased node cost and/or energy consumption. This paper focuses on the latency aspect. We investigate the impact of a timer that can be used to upper bound the slot insertion time on the medium. We also propose, a novel client packet queuing model in an optical slot switching ring and assess and compare the latency of these node architectures analytically, and with simulations

Performance Analysis in a Next Generation Optical Mobile Backhaul Network

International audienceNext generation mobile networks will offer high data rates to users utilizing new radio access technologies. In addition, new applications as well as devices such as smartphones and tablets will result in a rapid mobile traffic growth. Consequently, a rapid increase of the load in the mobile backhaul segment is expected, resulting in turn into a substantial increase of the energy consumption. An optical mobile backhaul network is proposed as the suitable solution to transport the mobile user data in an energy efficient fashion while ensuring a low latency. We propose in this paper to evaluate, analytically and by simulation, the latency in such next generation optical mobile backhaul network for realistic scenarios. The impact of class of service handling is also quantified