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Iovanna P.,Ericsson AB | Bottari G.,Ericsson AB | Cossu G.,Co.Ri.Tel.
2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2013 | Year: 2013

In packet-opto scenarios, packet offload towards the optical layer enables transit traffic to avoid packet processing in intermediate nodes saving costs and power. A strategy to dynamically tune the offload level is presented and simulated. © 2013 OSA.


Iovanna P.,Ericsson AB | Bottari G.,Ericsson AB | Cossu G.,Co.Ri.Tel
Optical Fiber Communication Conference, OFC 2013 | Year: 2013

In packet-opto scenarios, packet offload towards the optical layer enables transit traffic to avoid packet processing in intermediate nodes saving costs and power. A strategy to dynamically tune the offload level is presented and simulated. © 2013 OSA.


Iovanna P.,Ericsson AB | Bottari G.,Ericsson AB | Cossu G.,CoRiTel
National Fiber Optic Engineers Conference, NFOEC 2012 | Year: 2012

A network based on Packet-Optical integrated nodes is submitted to a survivability assessment to find the optimum balance between static and dynamic resiliency management. Extensive simulations on a metro network are reported. © 2012 OSA.


Iovanna P.,Ericsson AB | Germoni A.,CoRiTeL | Lopez V.,Telefonica
2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2013 | Year: 2013

An integrated solution relying on a centralized management and a distributed control plane is presented for packet optical networks. Simulations results, based on realistic network, traffic and node modeling, show up to 42% CapEx saving. © 2013 OSA.


Iovanna P.,Ericsson AB | Testa F.,Ericsson AB | Sabella R.,Ericsson AB | Bianchi A.,Ericsson AB | And 3 more authors.
Journal of Optical Communications and Networking | Year: 2012

The development of a new generation of photonic integrated circuits and the constant progress in integrated electronics (following Moore's law) made the realization of a new type of optical transport node possible, by basing it on the concept of a digital photonic switching layer working in coordination with the packet switching layer under the control of a multi-layer control plane. In this paper such a new type of optical transport node is presented, analyzed and implemented in order to better investigate its potential advantages and weaknesses if compared with the conventional all-optical transport nodes and their level of applicability. The new node concept is based on a vertical view of packet-opto networks able to face the challenge of growing network capacity while cutting costs and to allow an efficient combination of digital optical networks and packet-opto integration's benefits. Thanks to the use of optical-electrical-optical conversion technology, the wavelength division multiplexed (WDM) layer is provided with the traffic management flexibility and the engineering simplicity of digital transport systems (significant operational expenditures reduction) and with the network cost savings of large-scale photonic integration (capital expenditures reduction). It combines packet and WDM switching technologies where appropriate, with the ability to offload pass-through traffic from the packet layer to the lowest possible layer, so as to reduce costs and power consumption by eliminating unnecessary packet processing (total cost of ownership reduction). The main building blocks are a new digital optical transport based on an integrated packet-opto node that is scalable, flexible and low cost, and multi-layer control and management based on standard generalized multiprotocol label switching and innovative path computation element (PCE) solutions. Thanks to the flexibility of the digital reconfigurable optical add/drop multiplexer, the PCE is able to handle both layers in a very efficient way by selecting the right granularity for traffic grooming and routing. The feasibility has been assessed by a network prototype composed of four nodes produced by Ericsson Research Lab in Pisa and by a simulation analysis. © 2009-2012 OSA.


Iovanna P.,Ericsson AB | Ubaldi F.,Ericsson AB | Michele F.D.,CoRiTeL | Gimenez J.P.F.-P.,Telefonica | Lopez V.,Telefonica
Optical Fiber Communication Conference, OFC 2014 | Year: 2014

The article proposes a hierarchical routing approach, validated by simulation on real network operator, based on a novel adaptive virtualization scheme, suitable for transport SDN, allowing dynamic configuration of heterogeneous multi-domain packet-optical networks. © OSA 2014.


Germoni A.,Co.Ri.TeL. | Testa P.,Co.Ri.TeL. | Sabella R.,Ericsson AB | Listanti M.,University of Rome La Sapienza
2011 IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2011 | Year: 2011

The main requirement for the Next Generation Transport Network infrastructure is a flexible and efficient support of different services, demanding for several levels of Quality of Service (QoS) and resilience. In order to have an effective utilization of network resources, and the ability to react to traffic demand changes with time, such multi-service next generation transport networks, should be, to some extend, self-adapting. This requirement are pushing the migration from the traditional legacy circuit based transport networks towards integrated packet optical solutions. The need to introduce packet flexibility into the optics world relying on huge and reliable static pipes, without impacting the scalability of the nodes has lead to multilayer solutions such as current MSPP and POTP platforms based on multiple switching layers (i.e. packet, OTN and optical). This however requires complex control plane functionalities that limit their effectiveness and flexibility. This paper presents a new approach for next generation optical packet transport, based on a pure Layer 2 switching, that is Ethernet compliant since it does not require changes in Ethernet frame format and main Ethernet switch functionalities. It relies on a burst transmission structure that allows to reduce packet processing without introducing underlaid switching layers and consequently to scale switch forwarding functionalities. It could be regarded as a concrete step towards the realization of self-adapting networks. Some relevant simulation results are reported to discuss the main characteristics of such a new transport solution and assess the feasibility of the concept. © 2011 IEEE.


Iovanna P.,Ericsson AB | Germoni A.,CoRiTeL | Testa F.,Ericsson AB | Cossu G.,CoRiTeL | And 2 more authors.
Journal of Optical Communications and Networking | Year: 2013

This paper describes a novel multilayer (ML) path computation element (PCE) architecture based on a hybrid approach. Such a method operates in all network life cycles, optimizing both the design and the operative phases. The hybrid PCE is based on combined non-realtime and real-time operation and is able to integrate control and management functions. This architecture results in a reduction of overprovisioning during network design while guaranteeing availability of traffic by using control-plane-driven dynamic recovery schemes. It introduces advanced control functionality into the network, providing an easy-to-integrate solution. To fully exploit the control plane capabilities, a new architecture of colorless, directionless, and contentionless reconfigurable optical add/drop multiplexers and its related cost model are also presented. The solution has been assessed by simulations on the Spanish backbone network of Telefonica. The simulation analysis demonstrates the good performance of the proposed ML solution. The reduction of overprovisioning allows a capital expenditure saving of up to 46% with respect to a single-layer approach without any effect on the level of survivability of the traffic, thanks to new ML recovery schemes. © 2009-2012 OSA.


Eramo V.,University of Rome La Sapienza | Miucci E.,University of Rome La Sapienza | Cianfrani A.,University of Rome La Sapienza | Germoni A.,Co.Ri.Tel. | Listanti M.,University of Rome La Sapienza
International Conference on Transparent Optical Networks | Year: 2011

In this paper we propose an analytical model able to analytically evaluate the performance of an asynchronous Optical Packet Switch (OPS) realized in Semiconductor Optical Amplifier (SOA). The considered switch has a bufferless architecture that shares the wavelength converters for input wavelength. The obtained results show how the proposed model is more accurate than others proposed in literature in the case of small size switches. © 2011 IEEE.


Testa P.,CoRiTeL | Germoni A.,CoRiTeL | Listanti M.,University of Rome La Sapienza
Journal of High Speed Networks | Year: 2013

Telecommunication networks are evolving due to rapid growth of internet traffic and the necessity to satisfy the new requirements of emerging packet services. Upgrading of network devices so as they can allow scalable and full line rate traffic aggregation and eliminate any internal performance bottlenecks is crucial. In packet switching devices, since data plane functionalities need to be executed for each incoming packet and power per given bandwidth is strongly related to the amount of processing on this data, packet processing at ultra-high rate is becoming the major challenge. The main trend to address such power consumption and scalability issues is to bypass packet switches by switching traffic at lower layers. This results in the packet optical transport network approach, where packet switching provides flexible end-to-end connectivity based on tunnel encapsulation while wavelength switching, exploiting optical bypass, allows reducing electrical switch size at transit nodes. There are also opportunities consisting in simplifying packet switch functionalities or designing completely different packet switch architectures. In this paper a new Ethernet aggregation and switching solution with potentialities to simplify and scale Ethernet switch forwarding functionality is proposed. This solution, based on a burst-basis transmission compliant with the Ethernet Standard, is able to maintain flexibility and any to any connectivity deriving from the connectionless nature of Ethernet. At the same time, it provides Ethernet technology with efficient aggregation capabilities allowing to reduce processing of transit traffic. This is allowed thanks to an Ethernet burst structure conceived as a variable number of consecutive frames of the same connection preceded by a proprietary burst control frame carrying information necessary for burst data frames classification. As a result, burst control frames experience the conventional Ethernet switch packet processing while data frames are mapped on the corresponding queue/output port according to the result of control frames classification. The proposed solution also provides the possibility to recognize data frames of the same burst through a proprietary inter-frame gap inserted among them; that allows to dynamically adapt burst size to the available bandwidth at transit nodes in order to limit frame delay and jitter and to support intermediate grooming. These features make it a very competitive approach in the context of packet optical transport being able to support dynamic multi-granular switching. The proposed solution has been validated by estimating its efficiency in terms of energy consumption with respect to a commercial packet switch. The impact of burst transmission on packet delay and jitter across ring and mesh networks has been also evaluated through different sets of simulations. © 2013-IOS Press and the authors. All rights reserved.

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