First experimental demonstration of real-time orchestration in a Multi-head metro network

International audienceWe present for the first time the experimental demonstration of a Real-Time control-plane on the Multi-hEad sub-wavElength swiTching (MEET), Metro architecture. The key control assets are calculated and provided to the edge nodes in a form of grant files. These grant files eliminate the contention possibility at source nodes and destinations, thus they offer a lossless passive optical grooming and multiplexing/demultiplexing at the intermediate nodes. The experimental results validate the control plane structure designed based on a deterministic operating system well scalable for a regional metro network

Bandwidth Allocation Schemes for a Lossless Optical Burst Switching

International audienceResource allocation mechanism remains a challenging issue in the conception of the actual and future networks. In this paper, we study several resource allocation schemes for the control plane of a lossless Optical Burst Switching (OBS) solution. We carry out a comparison of the proposed schemes using simulation approach. The performances of the proposed schemes are compared in terms of waiting time, service time, jitter and throughput. Simulation parameters are chosen according to implementation constraints

Efficient Control Plane for Passive Optical Burst Switching Network

International audienceOne of the main drawbacks of classical Optical Burst Switching (OBS) solutions is the loss of bursts when contentions occur. Time-domain Wavelength Interleaved Networking (TWIN) is a lossless solution with contention resolution in the edge nodes providing a simple and passive switching in the core nodes and satisfying both low-energy and efficient bandwidth use criteria. However, this solution requires an efficient control plane. In this paper, we compare three different control planes based on either centralized or distributed schemes. Moreover we use two different slot allocation strategies (contiguous or disjoint). The performances of the proposed solutions are compared in terms of total delay, jitter, queue length and bandwidth utilization. The simulation parameters are carefully chosen to take into account implementation constraints. We find that the centralized solution with contiguous slot allocation is the most efficient and it allows a throughput up to 7 Gb/s

Is It Worth Adapting Sub-Wavelength Switching Control Plane to Traffic Variations?

International audienceThis paper proposes a novel Metropolitan Area Network (MAN) architecture called Multi-hEad sub-wavElength swiTching (MEET). Compared with the current architectures, MEET proposes to aggregate traffic using passive optical nodes instead of using electrical nodes (switches and routers). Several options regarding a potential control plane are compared in terms of resource allocation efficiency. Two options are relative to the burst assembly process whereas another option is relative to the dynamicity of the resource allocation process. Performance evaluation is carried out using a simulation platform fed by real traffic traces captured on a French operator's metropolitan network. The QoS delivered to three different classes of service has been assessed in terms of latency and jitter. Obtained results show that a control plane that does not adapt to short-term variations of the real traffic may provide QoS levels compatible with an operational MAN

Optimal Cost and Performance Evaluation of Various Protection Schemes for Reliable All-Optical Sub-Wavelength Switching Network

International audienceIn this paper, we study several alternatives of protection for Time-domain Wavelength Interleaved Network(TWIN), an optical burst switching technology for transport networks with active edge nodes, passive core nodes, and time slotted operation. The main difference between those alternatives concerns the degree of resource sharing (transmitters, receivers and wavelengths). After an extended study on the protection challenges in TWIN, we distinguish three main protection schemes: totally shared protection, partially shared protection and dedicated protection. We propose a network dimensioning comparison for the aforementioned schemes, based on linear programming formulation addressing the optimization of used resource. In addition, we assess the ability of the proposed schemes to maintain the network performance during the failure in terms of delay, jitter and packet loss ratio. The obtained results show that the totally shared protection scheme outperforms the other schemes in terms of resource utilization with non significant degradation of the performance, and a prompt recovery time