Sergio Pompei

QoE and QoS comparison in an anycast digital television platform operating on passive optical network

We report an experimental investigation on QoE, compared with the QoS, for a complete digital television platform able to deliver broadcast, multicast and unicast services in wide geographical area network, with broadband access based on passive optical network (PON). In particular, we show the service degradation due both to network impairments and to the TCP limits on operating systems. Multicast forwarding was tested in PBB-TE environment to exploit a Carrier Ethernet behavior. Concerning broadcasting, such a network allows the user to see the DVB-T by using the same optical infrastructure by means of the specific wavelength foreseen by the GPON standard.

Wavelength path optimization in optical transport networks for energy saving

Today Energy Consumption is one of the fundamental topics also for telecommunication networks. In this paper, we report a numerical investigation about energy saving in a transport network both exploiting the transmission properties that permit to reduce 3R equipments and reducing optical links during low traffic periods.

Experimental investigation on optical gigabit Ethernet network reliability for high-definition IPTV services

We show an experimental investigation about the quality of service of high-definition IPTV applications in a core-access gigabit Ethernet-multiprotocol label switching (MPLS) network test bed in terms of objective (or network) and subjective (or perceptive) measurements, using different network configurations. In the core part we investigated the role of the classes of services defined according to the differentiated service over MPLS and to the virtual private LAN service approach. Furthermore we also investigated the role of the restoration consequent to a link failure. For the access part we will show that for the asymmetric digital subscriber line 2+ (ADSL2+) architecture an important role is given to the edge routers to select the traffic with higher priority. Furthermore we show how an upgrade of the passive optical networks, by means of the WDM technique, can be particularly suitable for future peer-to-peer huge bandwidth services.

Quality of Service Control Based on Virtual Private Network Services in a Wide Area Gigabit Ethernet Optical Test Bed

Abstract We report an experimental investigation about the Virtual Private LAN Service technique to guarantee the quality of service in the metro/core network and also in the presence of access bandwidth bottleneck. We also show how the virtual private network can be set up for answering to a user request in a very fast way. The tests were performed in a GMPLS test bed with GbE core routers linked with long (tens of kilometers) GbE G.652 fiber links.

Experimental implementation of an IPTV architecture based on Content Delivery Network managed by VPLS technique

This work aims to shows how to use the base principles of a CDN (Content Delivery Network) to deliver Video Content through Open Internet for VoD (Video on Demand) service through a managed network to improve the reliability and to reduce the degradation due to congestion in the backbone area. The managed network is achieved by means of the VPLS (Virtual Protocol Lan Service) technique that allows the CDN to take advantages from features of a fast restoration in case of node or link failure and the Transport Engineer for the best Path.

Experimental investigations on restoration techniques in a wide area Gigabit Ethernet optical test bed based on Virtual Private LAN Service

The Virtual Private LAN Service (VPLS) is an interesting solution for telecom operators to deliver triple-play services in wide area optical Gigabit Ethernet networks. However, to be fully reliable such packet networks need protection and restoration capabilities: this is the topic of this paper where we report experimental investigations on restoration techniques in a VPLS environment. The tests have been carried out in a real wide area optical testbed and we compared different techniques.

Quality of Service Investigation on High Definition IPTV Services in a Multivendor Optical Network with ADSL Access

We report an experimental investigation about the Quality of Service of High Definition IPTV applications in a core-access network based on a DiffServ over MPLS architecture with GBE interfaces. We show that particular traffic treatments are required in the network, especially at the edge segment in order to guarantee high QoS performance.

Experimental implementation of efficient multicast processes: towards Carrier Ethernet networks and all-optical multicast

As the data traffic grows in IP networks, some adjustments are needed for making networks suitable for such kind of applications. In particular, packet switching and optical technologies in every network section will improve efficiency and bandwidth availability. Moreover, video applications are going to be predominant with respect to other ones, and IP networks could be seen as a viable alternative to traditional TV platforms. In this work, we show two network scenarios for multicast applications, and we propose and study two ways for packet replication both in Carrier Ethernet networks and IP over Optical networks.

Network Evolution Toward a Carrier-Grade Ethernet Transport Network

Abstract In this article, an overview is presented about state-of-the-art Ethernet technology and its evolutions beyond local area networks into metropolitan and wide area networks as carrier-grade technologies. It will be shown that the Ethernet can be used to guarantee the performance of current transport technologies in terms of operations, administration and maintenance, quality of service, monitoring, and test capabilities in support of service level agreements; in particular, the Ethernet could replace current transport techniques, simplifying network design and reducing both capital and operational expenditures. The Ethernet data-plane evolution will also be presented, from the virtual bridged local area network up to provider backbone bridging traffic engineering, including the issues related to the control plane. Also indicated is a future scenarios dealing with close interworking with optical technologies. In conclusion, a summary is given of experimental activities carried out on the virtual private local area network service, a current Layer 2 technique that can be assumed as a first step toward a carrier-grade Ethernet, which show the implementation of reliable wide area networks based only on gigabit Ethernet transmission.

Sharing under licensed shared access in a live LTE network in the 2.3–2.4 GHz band end-to-end architecture and compliance results

This paper presents the worlds first technical and regulatory pilot on Licensed Shared Access (LSA) in the 3GPP Band 40, i.e. 2.3–2.4 GHz band, enacted in Italy to delve deeper on the role that spectrum sharing has for efficient use of spectrum. The Italian Administration, in collaboration with the Joint Research Centre of the European Commission and the support of a consortium of industrial partners, has been the first in the world to promote and organize a LSA pilot on a large scale to verify both the technical feasibility and regulatory compliance of this technique applied to a real, live LTE network. The paper firstly introduces the pilot architecture and configuration and describes the sharing framework in the Italian scenario, then key measurements results are presented. The pilot implements a distributed control architecture in compliance with CEPT and ETSI provisions. Measurement results show the sharing based on LSA is feasible to provide mobile broadband services in the 2300–2400 MHz band without detriment to incumbent services.