Juan P. Fernández Palacios

Towards a transport SDN for carriers networks: An evolutionary perspective

Network operators have worked in interoperable scenarios for transport network from several years. The main motivation is to have a rich ecosystem, which encourages the competition to have more efficient network solutions. The bandwidth increment in the transport network puts a lot of pressure to have revenues on an environment where the end-user is willing to pay less and less for the service. Software Define Networks presents a new hope to achieve such desire multi-vendor interoperability. The aim of this paper is to present some architecture to enable interoperability in transport networks. Some of these architectures are market ready and they have been tried in the field, while there are some approaches which are under standardization.

A Bayesian decision theory approach for the techno-economic analysis of an all-optical router (extended version)

Typically, core networks are provided with both optical and electronic physical layers. However, the interaction between the two layers is at present limited, since most of the traditional transport functionalities, such as traffic engineering, switching and restoration, are carried in the IP/MPLS layer. In the light of this, the research community has paid little attention to the potential benefits of the interaction between layers, multilayer capabilities, on attempts to improve quality of service control. This paper shows when to move incoming label switched paths (LSPs) between layers based on a multilayer mechanism that trades off a QoS metric, such as end-to-end delay, and techno-economic aspects. Such a mechanism follows the Bayesian decision theory, and is tested with a set of representative case scenarios.

A Resilience-Based Comparative Study between Optical Burst Switching and Optical Circuit Switching Technologies

Internet operators and ISP providers have traditionally designed network resources following an over-planning policy, on attempts to maintain a desired grade of service and network availability, regardless of network failures. This work presents a comparative study of two resilience mechanisms in the design of optical networks either based on optical burst switching (OBS) or optical circuit switching (OCS): the M:N protection scheme with dedicated backup channels. It is further analysed and discussed the benefits and disadvantages of such mechanism based on an analytical model

Multilayer Traffic Engineering for IP Over WDM Networks Based on Bayesian Decision Theory

Network operators are migrating their networks to IP over WDM architectures. In such multilayer networks, it is necessary to define mechanisms that efficiently use the resources available from both layers in a coordinated manner. Thanks to the development of the control plane (GMPLS), it is feasible to both set up and tear down lightpaths automatically. Thus the WDM layer can now adapt its configuration to both meet a set of resource constraints and fulfill some predefined quality-of-service (QoS) requirements. To this end, we define a multilayer traffic engineering algorithm that efficiently manages the resources from both layers. This algorithm, which is based on Bayesian decision theory, finds the optimal number of label-switched paths that must be switched over the optical and electronic domains. Such an optimal value is found by trading off the QoS required by the users and the limited availability of network resources.

Research trends on ICT convergence from the CaON cluster

This is a positioning paper that presents some of the trends in optical networks, considered within the CaON (Converged and Optical Networks) cluster. The trends exposed are focused on the convergence of optical networks and IT infrastructures, optical virtualisation and the control and management in support of emerging cloud computing applications for the Future Internet. The paper introduces the CaON reference model as a key enabler in support of the Future Internet, and proposes a high level, multilayer architecture that spans from the physical domain to the applications. The CaON reference model is the main outcome of the joint effort between the projects belonging to the CaON FP7 EC cluster, and reflects the level of agreement between all of them. The purpose of this reference model is to present the architecture that the cluster foresees for the Future Internet.

Introduction to IP over WDM

The simple idea of having IP traffic directly transported over optical wavelength division multiplexing (WDM) technology (“IP over WDM”) has been envisioned as the future for the telecommunication infrastructure.

Drivers for Broadband in Europe

In this chapter we present the current status of broadband deployment in Europe and discuss the drivers for further deployment and the expected evolution in terms of the market, the services, the choice of technical solutions, and the main players. The main drivers for broadband are identified and discussed in the context of the European environment. We present an overview of the broadband regulatory framework in Europe as well as expected developments and discuss its impact on the evolution of broadband in this part of the world.

A Bayesian decision theory approach for the techno-economic analysis of an all-optical router

Typically, core networks are provided with both optical and electronic physical layers. However, the interaction between the two layers is at present limited, since most of the traditional transport functionalities, such as traffic engineering, switching and restoration, are carried in the IP/MPLS layer. In this light, the research community has paid little attention to the potential benefits of the interaction between layers, multilayer capabilities, on attempts to improve the Quality of Service control. This work shows when to move incoming Label Switched Paths (LSPs) between layers based on a multilayer mechanism that trades off a QoS metric, such as end-to-end delay, and techno-economic aspects. Such mechanism follows the Bayesian decision theory, and is tested with a set of representative case scenarios.