Pierre Peloso

Optical transparency of a heterogeneous pan-European network

We have experimentally shown that the physical design of a transparent network should be tailored to both the network topology and the network traffic matrix. For a pan-European network for which 85% of the traffic was shorter than 2000 km, almost all connections may be transparent; with very simple engineering rules (erbium-doped fiber amplifiers only, no power equalization except for the per-band equalization in the node, constant static dispersion management whatever the ingress and egress nodes, and whatever the wavelength...). We have also experimentally shown how dispersion management should take into account unavoidable inaccuracies that are to be found in the field.

Software-Defined LANs for Interconnected Smart Environment

In this paper, we propose a solution to delegate the control and the management of the network connecting the many devices of a smart environment to a software entity, while keeping end-users in control of what is happening in their networks. For this, we rely on the logical manipulation of all connected devices through device abstraction and network programmability. Applying Software Defined Networking (SDN) principles, we propose a software-based solution that we call Software-Defined LANs in order to interconnect devices of smart environments according to the services the users are requesting or expecting.We define the adequate virtualization framework based on Virtual Objects and Communities of Virtual Objects. Using these virtual entities, we apply the SDN architectural principles to define a generic architecture that can be applied to any smart environment. Then we describe a prototype implementing these concepts in the home networking context, through a scenario in which users of two different homes can easily interconnect two private but shareable DLNA devices in a dedicated video-delivery SD-LAN. Finally we provide a discussion of the benefits and challenges of our approach regarding the generalization of SDN principles, autonomic features, Internet of Things scalability, security and privacy aspects enabled by SD-LANs intrinsic properties.

Operator-driven framework for establishing and unifying autonomic network and service management solutions

It is commonly recognized that the technology progress, dynamism but also complexity of telecommunication networks and services increase with rapid paces. Such challenges cannot be efficiently handled by traditional networking and management schemes. Autonomics in network and services management appear as the most viable way out. However, despite the significant research efforts and achievements in this field, a few and only recently start to convince operators for their deployability. In this direction, UniverSelf is a research initiative which proposes a pragmatic solution for overcoming the increasing complexity a) by consolidating and capitalizing on lessons learnt and b) by identifying and solving actual, first-priority, immediate and mid-term manageability problems encountered by operators. The cornerstone of UniverSelf approach is the Unified Management Framework (UMF), an operator-driven framework that designates processes, tools and methods for establishing (legacy, emerging and yet undiscovered) autonomic solutions in the joint management of networks and services. This paper provides a first concise description of the UMF design in terms of core, reusable and cohesive functional blocks and interfaces, as derives from the elaboration of requirements elicited from a set of operator problems (use cases). The design is complemented by principles and goals that address important high-level challenges such as the unification/federation of diverse autonomic solutions and technology domains, the governance of autonomic infrastructures and services, as well as the embodiment of autonomic solutions (intelligence) into the management ecosystem.

Correction to “Optical Transmission Evolution: From Digital to Analog to ? Network Tradeoffs Between Optical Transparency and Reduced Regeneration Cost”

Recent technology developments have made high-capacity long-distance optical transmission routine out to several thousand kilometers, bringing the ideal of an optically transparent network closer than ever before. At the same time, advances in semiconductor processing and packaging have made it possible to achieve compact, very low cost optoelectronic building blocks. The objective of this workshop is to examine these technology trends to understand how they compete or cooperate to increase network performance while reducing cost.

Information Model for Managing Autonomic Functions in Future Networks

Future Internet (FI), a dynamic and complex environment, imposes management requirements, complexity and volume of data which can hardly be handled by traditional management schemes. Autonomic network and service management can be a powerful vision; a promising solution paving the way towards fully autonomic systems provides a three-level management approach and develops Information Modelling extensions for semantic continuity. This paper aims at proposing an Information Model for abstracting autonomic mechanisms for network management tasks and convincing on the relevance of using/extending standardized information models for system specification.

First optical packet switching demonstration with sixteen-channel InP monolithically integrated wavelength selector module

The first demonstration of optical packet switching with an InP monolithic 16-channel wavelength selector module is reported. Switching time below 5 ns, wide input power dynamic range of 15 dB, average polarisation dependent loss below 2 dB, and error free transmission are demonstrated.

Networks for high-bandwith services combining photonic circuit cross-connects with packet switches

We describe the dimensioning and benchmarking of packet transport networks with aggregated link capacities up to the Tbit/s range, using a circuit-switching (cross-connect) infrastructure below packet-switching nodes. The different network solutions to be evaluated are designed to carry large numbers of high-definition video and other data streams, with upper bounds on packet latency and packet loss rate for all flows. Trends of evolution are analyzed, based on a performance and cost comparison of several node architectures with different associated transport technologies (packet and circuit layers). Simulations of packet-switch nodes under pseudo-self-similar traffic, extraction of analytical models for latency and loss, end-to-end best path selection, and constrained optimization of crossconnect and packet-switch resources are combined to derive the dimensioning of all the network elements. As a result of this study, photonic cross-connects associated with carrier-grade Ethernet switches appear as the most efficient architectures, thanks to cost savings for transit traffic. Single-layer solutions involving for example only packet-switch routers turn out to be more expensive.

Applying optical transparency to a heterogeneous pan-European network

Applying an innovative experimental tool to a continental scale network, we demonstrate that up to 99.7% of the connections of a hybrid heterogeneous network may be established transparently at 10 Gbit/s with the simplest physical design.

Energy-aware traffic allocation to optical lightpaths in multilayer core networks

SUMMARY The amount of traffic that is generated by users and high-demanding services is expected to rise dramatically in the forthcoming years. This will unavoidably deteriorate the performance and increase the consumed energy of core networks, thus constraining the growth of Internet. To this effect, multilayer traffic engineering schemes in IP/multiprotocol label switching over dense wavelength division multiplexing networks have been proposed for achieving improved performance and increased energy savings by flexibly allocating traffic to optical lightpaths. In particular, the consumed energy in a router can be minimized if the lightpaths are established so as to traverse a router without electronic processing and conversion of their signal between optical and electrical layer. Accordingly, this paper aims at providing an energy-aware solution to the problem of traffic allocation to optical lightpaths in multilayer core networks. The problem is first formulated and then a solution based on a heuristic algorithm, called energy-aware traffic allocation to optical lightpaths (ETAL) is proposed. The efficiency and worthiness of ETAL is validated through numerous scenarios and simulations. The derived results indicate that the proposed algorithm is an efficient traffic engineering solution that exhibits better performance in terms of consumed energy (up to 44%), when compared to other similar traffic allocation schemes. Copyright

Realizing self-management via self-optimization in dynamic networks: Two examples of dynamic resource allocation

The primary goals of self-management are twofold: cost reduction and automated adaptive control of complex network operations. The optimal allocation of resources in dynamic networks has emerged as a recurrent denominator for a branch of self-optimization problems. Like most algorithms for self-management, traditional optimization algorithms are challenged by specific aspects of networks: complexity, scalability, and time variability. This paper proposes to address this class of problems with robust, adaptive, and distributed optimization methods, in order to cope with high levels of dynamicity and uncertainty, while still preserving good convergence properties. We illustrate the benefit of using such methods through two different problems occurring at different network layers: 1) at the transport layer, the flow admission control driven by quality of service (QoS) requirements; 2) at the service layer, the negotiation of service level agreements to sustain multi-domain QoS guarantees.