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  • 51.
    Jirattigalachote, Amornrat
    et al.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101).
    Katrinis, Kostas
    Athens Information Technology.
    Tzanakaki, Anna
    Athens Information Technology.
    Impairment Constraint Based Routing (ICBR) with service differentiation in survivable WDM networks2009In: European Conference on Optical Communication, ECOC, 2009, p. 1-2Conference paper (Refereed)
    Abstract [en]

    We propose and evaluate a novel survivable impairment constraint based routing (ICBR) algorithm with service differentiation at the bit error rate level. Simulations show significant improvement in connection blocking compared to conventional ICBR solutions.

  • 52.
    Jirattigalachote, Amornrat
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Yamada, Yoshiyuki
    Nagoya University.
    Cavdar, Cicek
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Hasegawa, Hiroshi
    Nagoya University.
    Sato, Ken-ichi
    Nagoya University.
    Impairment-Aware Routing and Waveband Assignment for Efficient Optical Transport Networks2012In: 2012 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2012, 2012, p. 6192131-Conference paper (Refereed)
    Abstract [en]

    We demonstrate the importance of considering physical impairments in waveband-based optical networks. We propose and evaluate an Impairment-Aware waveband-routing and waveband-assignment (IA-RWBA) algorithm achieving significant improvement in both impairment satisfaction rate and total network cost.

  • 53. Khorsandi, B. M.
    et al.
    Raffaelli, C.
    Fiorani, Matteo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Survivable BBU hotel placement in a C-RAN with an optical WDM transport2017In: DRCN 2017 - 13th International Conference on Design of Reliable Communication Networks, Institute of Electrical and Electronics Engineers (IEEE), 2017, article id 7993443Conference paper (Refereed)
    Abstract [en]

    In Centralized Radio Access Networks (C-RANs) Baseband Units (BBUs) are decoupled from Remote Radio Units (RRUs) and placed in BBU Hotels. In this way baseband processing resources can be shared among RRUs, providing opportunities for radio coordination and cost/energy savings. However, the failure of a BBU Hotel can affect a large number of RRUs creating severe outages in the radio network. For this reason, the design of a resilient C-RAN is extremely important. This paper focuses on the survivable BBU Hotel placement problem in C-RANs with an optical wavelength division multiplexing (WDM) transport. We first propose an algorithm that jointly decides (i) the placement of a minimum number of BBU Hotels and (ii) solves the Routing and Wavelength Assignment (RWA) problem for the fronthaul connections, ensuring that each RRU is connected to two different BBU Hotels (i.e., one primary and one backup). Then, we present a strategy for maximizing the sharing of backup BBU ports among RRUs, with the aim of reducing the total cost of the C-RAN while guaranteeing uninterrupted service provisioning in case of single BBU Hotel failure. Simulation results show that the proposed strategy helps reducing the overall C-RAN cost. On the other hand, it becomes also evident that the sharing benefits can be maximized only in the presence of a transport network with enough wavelength resources to handle potential bottlenecks that may occur when BBU Hotels are placed quite far from RRUs.

  • 54.
    Li, Yajie
    et al.
    KTH. Beijing University of Posts and Telecommunication, Beijing, China.
    Mårtensson, J.
    Fiorani, M.
    Skubic, B.
    Ghebretensaé, Z.
    Zhao, Y.
    Zhang, J.
    Wosinska, Lena
    KTH.
    Monti, Paolo
    KTH.
    Flexible RAN: A Radio Access Network Concept with Flexible Functional Splits and a Programmable Optical Transport2018In: 2017 European Conference on Optical Communication (ECOC), Institute of Electrical and Electronics Engineers (IEEE), 2018, p. 1-3Conference paper (Refereed)
    Abstract [en]

    We present the flexible RAN concept and evaluate its performance in different radio coordination scenarios considering an optical transport network. Results show the benefits of flexible RAN compared to C-RAN in terms of wavelength usage and transponder cost.

  • 55. Licciardello, M.
    et al.
    Fiorani, Matteo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Furdek, Marija
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Raffaelli, C.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Performance evaluation of abstraction models for orchestration of distributed data center networks2017In: 2017 19th International Conference on Transparent Optical Networks (ICTON), IEEE Computer Society, 2017, article id 8025184Conference paper (Refereed)
    Abstract [en]

    Cloud computing is increasingly based on geographically distributed data centers interconnected by high performance networks. Application of Software Defined Networking (SDN) is studied as an emerging solution to support dynamic network resource management for distributed data centers (DCs) jointly with extensive use of Network Function Virtualization (NFV). SDN/NFV operation takes advantage of orchestration of network control functions according to distributed DCs communication needs. Orchestration relies on a set of logical information related to the underlying infrastructure, called abstraction, which offers different levels of visibility of available resources, depending on the abstraction strategy adopted.

  • 56. Lorincz, J.
    et al.
    Meo, M.
    Alsusa, E.
    Ruffini, M.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Saavedra, A. G.
    Ho, C. K.
    Conference Report/IEEE OnlineGreenComm 20162017In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, no 1, p. 6-7, article id 7823325Article in journal (Other academic)
  • 57.
    Mahloo, Mozhgan
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Chen, Jiajia
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Cost Modeling of Backhaul for Mobile Networks2014Conference paper (Refereed)
    Abstract [en]

    Wireless heterogeneous networks (HetNets) based on small cells are a cost and energy efficient alternative to provide high capacity to the end users. On the other hand, the cost and energy consumption of backhaul network aggregating data traffic from a large number of base stations may limit the benefits brought by the use of small cell. In HetNet deployments it becomes thus essential to be able to assess the total cost of ownership (TCO) of the backhaul network. This paper presents for the first time a comprehensive cost evaluation methodology to compute the TCO of mobile backhaul networks. The presented model can be instrumental to identify the most critical cost drivers in the backhaul networks and to have a better understanding of the backhaul TCO dynamics when small cells are deployed. The proposed TCO model is then used in a case study where two technology options for the backhaul are considered, i.e., microwave and fiber. The results from the case study show how it is possible to identify the most critical cost factors, thus easing the way towards a cost efficient backhaul design strategy.

  • 58.
    Mahloo, Mozhgan
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    De Souza Farias, Fabricio
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Weyl Albuquerque Costa, João Crisóstomo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Chen, Jiajia
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Techno-Economic and Business-Feasibility Modeling of Mobile BackhaulManuscript (preprint) (Other academic)
  • 59. Mello, D. A. A.
    et al.
    Barreto, A. N.
    Barbosa, F. A.
    Osorio, C.
    Fiorani, Matteo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Spectrally efficient fronthaul architectures for a cost-effective 5G C-RAN2016In: International Conference on Transparent Optical Networks, IEEE Computer Society, 2016Conference paper (Refereed)
    Abstract [en]

    In 5G wireless systems, centralized RAN (C-RAN) is an architectural choice where the signal waveforms received by Remote Radio Heads (RRH) are transparently forwarded to base band units (BBU), in many cases using an optical fronthaul. Although C-RAN highly simplifies the RRH, which is positive from the operational cost standpoint, much of the system complexity and cost is shifted towards the optical fronthaul. In this paper we show how a cost-effective C-RAN requires a spectrally-efficient optical fronthaul, and discuss the technological options to realize it.

  • 60.
    Monti, Paolo
    The University Of Texas At Dallas.
    Achieving reliable networking for the generic autonomous platform for sensor systems: (GAP4S)2005Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Networks of wireless integrated sensors are often used to monitorparameters distributed in the environment. These parameters arerelated to a variety of applications such as security, patientmonitoring, chemical and biological hazard detection. Some solutionsrely on replaceable batteries with a limited life-time to providelong-term sensor operation. Others envision short transmission rangesensors (few meters) that harvest their energy from variousenvironmental sources (e.g., solar, vibrations, acoustic noise). TheGeneric Autonomous Platform for Sensors (GAP4S) project explores anapproach for wireless sensors that is complementary to these andother pre-existing solutions.

    In GAP4S, the wireless sensor micro-battery is remotely rechargedvia a microwave signal. Medium transmission ranges in the tens tohundreds of meters are possible. Within these wireless transmissionranges, a base-station collects data transmitted by the sensors andacts as the access point to a wider (typically wired) communicationnetwork, e.g., the Internet. The authorized user can, therefore,remotely connect to, monitor, and manage both the sensor network andthe individual sensors. An essential component of GAP4S is itsend-to-end network reliability solution, which ensures the deliveryof data generated at the sensor to the interested user across boththe wireless and wired segments.

    This dissertation investigates ways to achieve reliable networkingfor GAP4S over both the wireless and the wired segments. A speciallydesigned solution is provided in each segment.

    In the wireless segment, error-free transmissions from the sensornode to the base-station is achieved using automatic repeat request(ARQ) protocols at layer 2. Two classes of ARQ protocols aredesigned and compared. The first is the conventional ARQ, wherebythe data frame is retransmitted by the originating sensor untilsuccessfully received by the base-station. The second class takesadvantage of cooperative radio communications, wherebymultiple neighboring sensor nodes may combine their efforts duringthe retransmission process. The ARQ protocols are compared in termsof their saturation throughput, i.e., the maximum data flow that thesensor node can sustain constrained to the available energy amount.In a variety of scenarios --- current and future expected circuitenergy consumptions --- the cooperative ARQ protocols may more thandouble the saturation throughput when compared to conventional ARQprotocols. Equivalently, it can be said that the energy required tooperate the system may be reduced by half.

    In the wired segment, fault tolerant networking is achieved by meansof protection switching at layer 3. Given the increasinglywidespread use of Wavelength Division Multiplexed (WDM) backbonenetworks, the protection switching scheme is designed to operate inconjunction with WDM. Optical circuits are made reliable by means ofa Shared Path Protection (SPP) switching scheme. The SPP scheme isgeneralized to guarantee Differentiated levels of Reliability (DiR)to the user. In the SPP-DiR combined scheme the desired level ofreliability may be guaranteed while minimizing the required networkresources, i.e., wavelengths. This feature makes it possible tosupport more optical connections and users when compared to otherexisting protection switching schemes.

  • 61.
    Monti, Paolo
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Castoldi, Piero
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Special issue based on selected ONDM 2014 papers2015In: Photonic network communications, ISSN 1387-974X, E-ISSN 1572-8188, Vol. 29, no 3, p. 227-229Article in journal (Other academic)
  • 62.
    Monti, Paolo
    et al.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101). KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Cavdar, Cicek
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101). KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth. Istanbul Technical University, Turkey.
    Chen, Jiajia
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101). KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101). KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Fumagalli, Andrea
    The University of Texas at Dallas, US.
    New Dimensions for Survivable Service Provisioning in Optical Backbone and Access Networks2012In: Resilient Optical Network Design: Advances in Fault-Tolerant Methodologists / [ed] Mark Leeson and Yousef Kavian, IGI Global, 2012, p. 227-252Chapter in book (Refereed)
    Abstract [en]

    Originally, networks were engineered to provide only one type of service, i.e. either voice or data, soonly one level of resiliency was requested. This trend has changed, and today’s approach in serviceprovisioning is quite different. A Service Level Agreement (SLA) stipulated between users and serviceproviders (or network operators) regulates a series of specific requirements, e.g., connection set-up timesand connection availability that has to be met in order to avoid monetary fines. In recent years this hascaused a paradigm shift on how to provision these services. From a “one-solution-fits-all” scenario, wewitness now a more diversified set of approaches where trade-offs among different network parameters(e.g., level of protection vs. cost and/or level of protection vs. blocking probability) play an important role.This chapter aims at presenting a series of network resilient methods that are specifically tailored for adynamic provisioning with such differentiated requirements. Both optical backbone and access networksare considered. In the chapter a number of provisioning scenarios - each one focusing on a specificQuality of Service (QoS) parameter - are considered. First the effect of delay tolerance, defined as theamount of time a connection request can wait before being set up, on blocking probability is investigatedwhen Shared Path Protection is required. Then the problem of how to assign “just-enough” resources tomeet each connection availability requirement is described, and a possible solution via a Shared PathProtection Scheme with Differentiated Reliability is presented. Finally a possible trade off between deploymentcost and level of reliability performance in Passive Optical Networks (PONs) is investigated. 

    The presented results highlight the importance of carefully considering each connection’s QoS parameterswhile devising a resilient provisioning strategy. By doing so the benefits in terms of cost saving andblocking probability improvement becomes relevant, allowing network operators and service providersto maintain satisfied customers at reasonable capital and operational expenditure levels.

  • 63.
    Monti, Paolo
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Costa, J. C. W. A.
    Farias, F. S.
    Fiorani, M.
    Nilson, Mats
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Tombaz, Sibel
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Västberg, Anders
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Green mobile backhaul in heterogeneous wireless deployments2013In: Asia Communications and Photonics Conference, ACP 2013, Optical Society of America, 2013Conference paper (Refereed)
    Abstract [en]

    This tutorial first introduces and describes different backhaul technological and architectural options (i.e., fiber-, microwave-, and copper-based), then it discusses their impact on the energy consumption of current and future heterogeneous mobile wireless access deployments.

  • 64.
    Monti, Paolo
    et al.
    KTH.
    Li, Y.
    KTH. Beijing Univ Posts & Telecommun, Beijing, Peoples R China..
    Martensson, J.
    RISE Acreo, Kista, Sweden..
    Fiorani, M.
    Ericsson Res, Stockholm, Sweden..
    Skubic, B.
    Ericsson Res, Stockholm, Sweden..
    Ghebretensae, Z.
    Ericsson Res, Stockholm, Sweden..
    Wosinska, Lena
    KTH.
    A Flexible 5G RAN Architecture with Dynamic Baseband Split Distribution and Configurable Optical Transport2017In: 2017 19TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON), Institute of Electrical and Electronics Engineers (IEEE), 2017Conference paper (Refereed)
  • 65.
    Monti, Paolo
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Morea, Annalisa
    Nirmalathas, Ampalavanapillai
    Vokkarane, Vinod M.
    Special issue on energy-efficient optical networks2015In: Photonic network communications, ISSN 1387-974X, E-ISSN 1572-8188, Vol. 30, no 1, p. 1-3Article in journal (Other academic)
  • 66.
    Monti, Paolo
    et al.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101).
    Muhammad, Ajmal
    Linköpings Tekniska Högskola.
    Cerutti, Isabella
    Scuola Superiore Sant'Anna.
    Cavdar, Cicek
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101).
    Castoldi, Piero
    Scuola Superiore Sant'Anna.
    Tzanakaki, Anna
    Athens Information Technology.
    Energy-efficient lightpath provisioning in a static WDM network with dedicated path protection2011In: International Conference on Transparent Optical Networks, IEEE , 2011, p. 1-5Conference paper (Refereed)
    Abstract [en]

    The interest in the energy consumption of communication networks has risen in the recent years. In an effort to tackle this problem, several approaches have been presented to reduce the power consumed by the entire network infrastructure, including optical transport. Most of the solutions studied and proposed in the literature, however, pay little or no attention to the power consumed to ensure the resiliency of the overall network. In wavelength division multiplexing (WDM) networks resilient to single failures, an innovative strategy that can be adopted to reduce power consumption entails setting to sleep mode the optical devices supporting solely protection lightpaths. To take full advantage of this strategy, it is important to optimally route the lightpaths so that the number of devices supporting exclusively protection lightpaths is maximized. An optimal solution for this provisioning problem was previously presented, but features a limited scalability with the network size. This paper first proposes a scalable and efficient heuristic that chooses the route of the working and protection lightpaths with the aim to maximize the power saving. The performance of the heuristic is compared with the optimal solution and a sensitivity analysis of the drained power is carried out by considering a variety of networking scenarios. Up to 20% of the network links can be set to sleep leading to significant power saving, especially at low load and when the power consumption in sleep mode is negligible.

  • 67.
    Monti, Paolo
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Natalino, Carlos
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Ahmed, Jawwad
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Frances, Renato
    Restoring optical cloud services using relocation2014Conference paper (Refereed)
    Abstract [en]

    Optical cloud is a very popular concept by which storage and computing resources (i.e., IT resources) are distributed over different datacenter (DC) locations interconnected via high-speed optical wavelength division multiplexing (WDM) links. In this paradigm cloud services are provisioned in an anycast fashion, where only the source node needs to be specified in the routing and resource assignment phase, while any DC (with enough IT resources) can be used to accommodate a cloud service. Anycast provisioning has a number of advantages already recognized by optical cloud providers [1][2]. This kind of provisioning paradigm allows, for example, for the live relocation of the already provisioned cloud services, referred to as the service relocation concept. It means that if the DC location is not essential for the execution of a certain cloud service, multiple relocations of the job to other DC locations are possible. This allows for a more efficient management of both the cloud and the transport network resources. Service relocation has also the potential to bring an extra degree of flexibility to survivability strategies. By providing the option for relocating a cloud service it is possible to use a backup path terminating at a DC that is different from the one used by the primary path. This benefit has been assessed in the literature showing the ability to improve resources efficiency by using service relocation in conjunction with path protection strategies [1]. Another instance in which service relocation might be beneficial is when it is combined with restoration-based survivability strategies. These strategies are very efficient in using backup resources, i.e., they are dynamically provisioned only upon a failure, but restoration-based approaches suffer from a certain risk that the backup network resources might not be available when needed [3]. Service relocation can potentially alleviate this problem. This talk presents a study where the objective is to inves- igate if relocating a cloud service disrupted by a network failure is beneficial in terms of both restorability and average connection availability. To this end the talk will present a number of results based on the solution of an efficient and scalable heuristic algorithm able to jointly solve the restoration and service relocation problem. These results are also benchmarked against the performance of an integer linear programming (ILP) model [4] optimizing the same objective function as the heuristic. In summary it can be concluded that by using relocation the average service availability can be significantly improved requiring only a minimal fraction of the cloud services to be relocated. In addition the proposed heuristic behaves very closely to the optimal ILP results in terms of both restorability and average connection availability.

  • 68.
    Monti, Paolo
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Shen, Gangxiang (Steven)
    Soochow Univ, Suzhou, Peoples R China..
    Wong, Elaine
    Univ Melbourne, Melbourne, Vic, Australia..
    Introduction to the Feature Issue on the IEEE Globecom 2017 ONS Symposium2018In: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 10, no 8, p. ONS1-ONS2Article in journal (Other academic)
    Abstract [en]

    This feature issue is based on extended and revised versions of the top-ranked papers presented at the Optical Networks and Systems (ONS) Symposium that took place during the IEEE Global Communications Conference (GLOBECOM 2017). The papers appearing in this Feature Issue cover a wide range of topics, including elastic optical networks, mobile fronthaul, network function virtualization, survivability, and hybrid datacenter networks.

  • 69.
    Monti, Paolo
    et al.
    University of Texas at Dallas.
    Tacca, Marco
    The University of Texas at Dallas.
    Fumagalli, Andrea
    The University of Texas at Dallas.
    Optimized transmission power levels in a cooperative ARQ protocol for microwave recharged wireless sensors2005In: Communications, 2005. ICC 2005. 2005 IEEE International Conference on, IEEE , 2005, Vol. 5, p. 3290-3294Conference paper (Refereed)
    Abstract [en]

    The generic autonomous platform for sensor systems (GAP4S) is a maintenance-free wireless sensor network in which the sensor node battery does not need to be replaced. Power is delivered to the sensor node via a microwave signal that is radiated by a base-station. The base-station also acts as the entry point to a wider communication network, e.g., the Internet. The paper describes an automatic repeat request (ARQ) protocol that may be used in GAP4S to yield reliable and fair data transmission from the sensor nodes to the base-station. The protocol takes advantage of cooperative communication, whereby neighboring sensor nodes help during the retransmission process. The transmission power level is optimized at each sensor node to increase the saturation throughput of the ARQ protocol.

  • 70.
    Monti, Paolo
    et al.
    University of Texas at Dallas.
    Tacca, Marco
    The University of Texas at Dallas.
    Fumagalli, Andrea
    The University of Texas at Dallas.
    Resource-efficient path-protection schemes and online selection of routes in reliable WDM networks2004In: Journal of Optical Networking, ISSN 1536-5379, Vol. 3, no 4, p. 188-203Article in journal (Refereed)
    Abstract [en]

    Feature Issue on Next-Generation WDM Network Design and Routing (WDMN) The optimal choice of routing and wavelength assignment (RWA) for the working and protection path-pair of the newly generated demand request is often a complex problem in reliable wavelength-division-multiplexed (WDM) networks subject to dynamic traffic. The challenge is twofold: how to provide the required reliability level without over-reserving network resources and how to find a good solution of the RWA problem under constrained computational time. Two important contributions are made. First, the shared path protection (SPP) switching scheme is generalized to guarantee the required (differentiated) level of reliability to all arriving demands, while, at the same time, ensuring that they contain the required amount of reserved network resources. This generalization is referred to as SPP-DiR. Second, an approach for choosing the working and protection path-pair routing for the arriving demand is proposed. The approach is based on a matrix of preselected path-pairs: the disjoint path-pair matrix (DPM). Results show that, when the SPP-DiR scheme is applied, a small reduction in demand reliability corresponds to a significant reduction of the required network resources, when compared with the conventional SPP. In turn, the demand blocking probability may be reduced more than one order of magnitude. It is also shown that the DPM approach is suitable for obtaining satisfactory RWA solutions in both SPP-DiR and conventional SPP networks. The use of the DPM is most suited when the time for solving the RWA problem is constrained, e.g., when demand requests must be served swiftly.

  • 71.
    Monti, Paolo
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Tombaz, Sibel
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Zander, Jens
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    Mobile backhaul in heterogeneous network deployments: Technology options and power consumption2012In: 14th International Conference on Transparent Optical Networks, 2012, p. 1-7Conference paper (Refereed)
    Abstract [en]

    Mobile communication networks account for 0.5% of the global energy consumption, a value that is expected to double within the next five years. For this reason, means of reducing the energy consumption in cellular mobile radio networks has recently gained great interest within the research community. In mobile networks the backhaul contribution to the total power consumption is usually neglected because of its limited impact compared to that of the radio base stations. However, meeting the almost exponential increase in mobile data traffic requires a large number of (mainly small) base stations. This means that backhaul networks will take a significant share of the cost and the energy consumption in future systems. Their actual contribution to the energy consumption will depend on the radio base station deployment scenario as well as on the technology and topology choices for the backhaul itself. This paper presents an initial assessment of the power consumption of two established backhaul technologies, i.e., fiber and microwave. For the microwave case, three backhaul topologies are considered, i.e., tree, ring and star, while for the fiber case only one topology is analysed, i.e., a dedicated point-to-point star. The presented results, assuming off-the-shelf products and based on todays network capacity levels, confirm the importance of considering the backhaul when minimizing the total power consumption in heterogeneous network scenarios. They also show the impact of the basic technology and topology choices of the backhaul for minimizing total power consumption.

  • 72.
    Monti, Paolo
    et al.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
    Wiatr, Pawel
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Jirattigalachote, Amornrat
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Trading Power Savings for Blocking Probabilityin Dynamically Provisioned WDM Networks2010Conference paper (Other academic)
    Abstract [en]

    In those networking scenarios (e.g., the stationary/mobile wireless paradigm) where limited energy storagecapabilities is a limiting factor, power efficiency has been studied extensively for a long time. In the last fewyears, the steadily growing power consumption figures of ICT [1][2] along with a recent public awareness of thepossible environmental effects, broadened the focus of the research efforts towards more power conscioussolutions also for wired networks. One promising solution going in this direction is represented by transparentwavelength division multiplexing (WDM) networks, where all-optical circuits (or lightpaths) carry the networktraffic from the source to the destination node in the optical domain, i.e. without any optical-to-electrical(O-E-O) conversion. To further improve network power efficiency, several approaches have been proposed inthe literature attempting to reduce the power consumption in transparent WDM networks [3][4]. Among them,power aware (PA) routing and wavelength assignment (RWA) algorithms are receiving a lot of attention. Onepossible solution for the PA-RWA problem is to limit the number of devices in the network that need to bepowered-on to support the lightpath requests [5]. These methods, however, have an adverse impact on the lengthof the provisioned lightpaths. In order to efficiently use as much powered-on network resources as possible, thepath length is, on average, longer than the one found with traditional (and less power efficient) shortest pathsolutions. This is in contradiction with the goal of classical RWA algorithms that tend to minimize the resourceusage (i.e., wavelengths and fibers) within the network, in order to minimize the blocking probability. Whenavailability of network resources becomes something that cannot be overlooked, a trade off needs to be assessedbetween power savings and blocking probability.In this talk, a non-conventional solution to the PA-RWA problem is presented. It is based on the intuitionthat, in some cases, relaxing the power minimization constraint can have beneficial effects on the overallnetwork performance, i.e., it can contribute to the reduction of resource fragmentation in the network and, in thisway, lower the blocking probability. The proposed algorithm leverages on a cost function that considers both thepower status of network elements (in this particular case the in-line optical amplifiers on fiber links only) and theinformation about wavelength usage. The algorithm has been tested using a Pan-European core network (i.e.,COST 239). Performance results confirm the presence of a trade-off between energy saving and blockingprobability. They also suggest that a “binary” approach using only the powered-on/powered-off informationmight not always be the best choice.

  • 73. Muhammad, A.
    et al.
    Furdek, Marija
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab). University of Zagreb, Croatia.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Forchheimer, R.
    An optimization model for dynamic bulk provisioning in elastic optical networks2014In: Asia Communications and Photonics Conference, ACPC 2014, 2014Conference paper (Refereed)
    Abstract [en]

    We investigate benefits of setup-delay tolerance in elastic optical networks and propose an optimization model for dynamic and concurrent connection provisioning. Simulation shows that the proposed strategy offers significant improvement of the network blocking performance.

  • 74.
    Muhammad, Ajmal
    et al.
    Linköpings tekniska högskola.
    Cavdar, Cicek
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Fair scheduling of dynamically provisioned WDM connections with differentiated signal quality2012In: 2012 16th International Conference on Optical Networking Design and Modelling, ONDM 2012, IEEE , 2012, p. 6210281-Conference paper (Refereed)
    Abstract [en]

    Emerging, on-demand applications (e.g., Interactive video, ultra-high definition TV, backup storage and grid computing) are gaining momentum and are becoming increasingly important. Given the high bandwidth required by these applications, Wavelength Division Multiplexing (WDM) networks are seen as the natural choice for their transport technology. Among the various on-line strategies proposed to provision such services, the ones based on service level agreement (SLA) metrics such as setup delay tolerance and connection holding-time awareness showed a good potential in improving the overall network blocking performance. However, in a scenario where connection requests are grouped in different service classes, the provisioning success rate might be unbalanced towards those connection requests with less stringent requirements, i.e., not all the connection requests are treated in a fair way. This paper addresses the problem of how to guarantee the signal quality and the fair provisioning of different service classes, where each class corresponds to a specified target of quality of transmission (QoT). With this objective in mind three fair scheduling algorithms are proposed in a dynamic traffic scenario, each one combining in a different way the concept of both set-up delay tolerance and connection holding-time awareness. Proposed solutions are specifically taylored to facilitate the provisioning of the most stringent service class so as to balance the success rate among the different classes. Simulation results confirm that the proposed approaches are able to guarantee a fair treatment reaching up to 99% in terms of Jain's fairness index, considering the per-class success ratio, without compromising the improvements in terms of overall network blocking probability.

  • 75. Muhammad, Ajmal
    et al.
    Furdek, Maria
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab). University of Zagreb, Croatia .
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Forchheimer, Robert
    Dynamic provisioning utilizing redundant modules in elastic optical networks based on architecture on demand nodes2014In: Optical Communication (ECOC), 2014 European Conference on, 2014, p. 1-3Conference paper (Refereed)
    Abstract [en]

    Survivable synthetic ROADMs are equipped with redundant switching modules to support failure recovery. The paper proposes a dynamic connection provisioning strategy which exploits these idle redundant modules to provision regular traffic resulting in a substantial improvement in the blocking performance.

  • 76. Muhammad, Ajmal
    et al.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Cerutti, Isabela
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Castoldi, P.
    Reliability Differentiation in Energy Efficient Optical Networks with Shared Path Protection2013In: 2013 IEEE Online Conference on Green Communications, OnlineGreenComm 2013, IEEE , 2013, p. 64-69Conference paper (Refereed)
    Abstract [en]

    Energy and resource efficiency are two contrasting objectives to optimize in dynamic and survivable optical networks. Known solutions for improving the energy efficiency include the use of the shared path-protection (SPP) mechanism and of a low power consuming mode (i.e., sleep) for protection resources. On the other hand, resource efficiency can be improved by introducing the concept of Differentiated Reliability (DiR) which can be combined with SPP in order to match the level of provisioned protection resources to the reliability requirements for each specific demand. This paper assesses the energy efficiency of the DiR concept combined with SPP and sleep mode support. A multi-objective optimization algorithm is proposed with the intent of jointly optimizing the energy and resource efficiency when dynamically establishing lightpaths with specific reliability levels. Simulation results show that when the proposed multi-objective cost function is properly tuned, not only the SPP-based DiR approach reduces the blocking probability but it is also able to save power for any network load. By enabling sleep mode additional power savings can be achieved at low loads, leading to an overall saving of up to 25%.

  • 77.
    Muhammad, Ajmal
    et al.
    Linköpings tekniska högskola.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101).
    Cerutti, Isabella
    Scuola Superiore Sant'Anna.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101).
    Castoldi, Piero
    Scuola Superiore Sant'Anna.
    Tzanakaki, Anna
    Athens Information Technology.
    Energy-Efficient WDM Network Planning with Dedicated Protection Resources in Sleep Mode2010In: Global Telecommunications Conference (GLOBECOM 2010), 2010 IEEE, IEEE , 2010, p. 1-5Conference paper (Refereed)
    Abstract [en]

    Energy-efficient optical networks are gaining momentum as environmental-friendly solutions with reduced operational costs. Energy-efficiency can be achieved by using devices in sleep mode, i.e., a low-power, inactive state in which devices can be suddenly waken-up upon occurrence of triggering events. This paper advocates a sleep mode option for the optical devices (e.g., amplifiers, optical switches) installed for protection purposes only. These devices can be put in sleep mode to reduce the network power consumption, but they can be promptly waken up (if necessary) upon a failure occurrence. This principle is proposed and applied in Wavelength Division Multiplexing (WDM) networks with dedicated-path protection to ensure survivability against single-link failures. The main contribution of the paper is the definition of the energy-efficient network planning problem for resilient WDM networks where optical devices can be configured in sleep mode. Optimal results of the integer linear programming (ILP) problem show savings of up to 25% in the overall power consumption.

  • 78.
    Muhammad, Ajmal
    et al.
    KTH, School of Information and Communication Technology (ICT).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT).
    Samadi, P.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT).
    Bergman, K.
    Joint Allocation of IT and Connectivity Resources for Survivable Services in Geographically Distributed Metro Data Centers2018In: 2017 European Conference on Optical Communication (ECOC), Institute of Electrical and Electronics Engineers (IEEE), 2018, p. 1-3Conference paper (Refereed)
    Abstract [en]

    The paper proposes a survivable and programmable metro-scale converged inter- and intra-datacenter network architecture and exploits its unique features for allocating jointly IT and connectivity resources. The proposed dynamic provisioning strategy offers a substantial reduction of service request blocking.

  • 79.
    Muhammad, Ajmal
    et al.
    KTH, School of Information and Communication Technology (ICT).
    Sgambelluri, A.
    Dugeon, O.
    Martin-Perez, J.
    Paolucci, F.
    De Dios, O. G.
    Ubaldi, F.
    Pepe, T.
    Bernardos, C. J.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT).
    On the scalability of connectivity services in a multi-operator orchestrator sandbox2018In: Optics InfoBase Conference Papers, Optics Info Base, Optical Society of America, 2018Conference paper (Refereed)
    Abstract [en]

    The paper investigates the performance of a multi-domain orchestrator (MdO) deployed in a real multi-domain European testbed. Results show how the MdO prototype scales well with the number of domains advertised and connectivity services provisioned.

  • 80.
    Muhammad, Ajmal
    et al.
    KTH.
    Sgambelluri, A.
    Scuola Super Sant Anna, Pisa, Italy..
    Dugeon, O.
    Orange Labs, Lannion, France..
    Martin-Perez, J.
    Univ Carlos III Madrid, Madrid, Spain..
    Paolucci, F.
    Scuola Super Sant Anna, Pisa, Italy..
    De Dios, O. G.
    TID Telefon, Madrid, Spain..
    Ubaldi, F.
    Ericsson Res, Pisa, Italy..
    Pepe, T.
    Ericsson Res, Pisa, Italy..
    Bernardos, C. J.
    Univ Carlos III Madrid, Madrid, Spain..
    Monti, Paolo
    KTH.
    On the Scalability of Connectivity Services in a Multi-Operator Orchestrator Sandbox2018In: 2018 Optical Fiber Communications Conference and Exposition, OFC 2018 - Proceedings, Institute of Electrical and Electronics Engineers (IEEE), 2018Conference paper (Refereed)
    Abstract [en]

    The paper investigates the performance of a multi-domain orchestrator (MdO) deployed in a real multi-domain European testbed. Results show how the MdO prototype scales well with the number of domains advertised and connectivity services provisioned.

  • 81.
    Musumeci, Francesco
    et al.
    Politecn Milan, Milan, Italy..
    Kanonakis, Konstantinos
    Huawei Technol, Philadelphia, PA USA..
    Monti, Paolo
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Zhang, Jiawei
    Beijing Univ Posts & Telecommun, Beijing, Peoples R China..
    Introduction to PNET special issue on "Resilience in future 5G photonic networks"2019In: Photonic network communications, ISSN 1387-974X, E-ISSN 1572-8188, Vol. 37, no 3, p. 263-264Article in journal (Other academic)
  • 82. Nag, Avishek
    et al.
    Furdek, Marija
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Ruffini, Marco
    Exploiting Dual Homing in Access Networks to Improve Resiliency in Core Networks2016In: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 8, no 11, p. 854-862Article in journal (Refereed)
    Abstract [en]

    We propose a network architecture consisting of long-reach passive optical network-based access and a transparent optical core network. The end users are connected to the remote node or the local exchange (LE) through an optical distribution network, and the remote node is connected by disjoint feeder fiber links to central offices located in two distinct metro/ core (MC) nodes. This method of connecting a single remote node to two geographically separate MC nodes for dedicated protection in case of feeder fiber failure is referred to as dual homing. In this work, we explore the benefits of dual homing in the access in simultaneously providing better resilience and load balancing in the core network considering connections between LEs. While looking into the benefits of dual homing in terms of network resiliency, we also explore whether the path redundancies added by dual homing play a role in providing efficient distribution of load across the core network and thereby reduce the cost of provisioning capacity in terms of number of lightpaths, transponders, etc. Dual homing at both the source and destination LEs offers more options for paths between LEs through the core network. Our results show that dual-homed access proves to be advantageous over single-homed access in terms of enhancing both core network resiliency and facilitating better load balancing.

  • 83. Natalino, C.
    et al.
    Ahmed, J.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Frances, R.
    A relocation-based heuristic for restoring optical cloud services2014In: 2014 13th International Conference on Optical Communications and Networks, 2014Conference paper (Refereed)
    Abstract [en]

    Optical clouds allow for an integrated management of optical transport and cloud resources (e.g., storage and computing resources running on datacenters). In this paradigm the concept of service relocation (i.e., the ability to re-allocate to a different datacenter node an already provisioned cloud service) offers a new way to restore the network upon failure. This paper presents a heuristic (called H-RELOCATION) based on the service relocation concept to be used for the dynamic restoration of optical cloud services. Upon the occurrence of a network failure, H-RELOCATION solves the routing and resource (i.e., transport plus cloud) allocation problem for each disrupted cloud service allowing, if necessary, to relocate some cloud services to different datacenter nodes. The proposed strategy is benchmarked against two optimal restoration strategies based on Integer Linear Programming (ILP) formulations, the first one without and the second one with the ability to use the service relocation idea. Simulation results show that H-RELOCATION offers performance (i.e., blocking probability, restorability levels and number of required relocations) very close to the optimum, offering on the other hand, a significant reduction in the processing time required for each successfully restored cloud service.

  • 84.
    Natalino, Carlos
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Chiaraviglio, L.
    Idzikowski, F.
    Francês, C. R. L.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Optimal lifetime-aware operation of green optical backbone networks2016In: IEEE Journal on Selected Areas in Communications, ISSN 0733-8716, E-ISSN 1558-0008, ISSN 0733-8716, Vol. 34, no 12, p. 3915-3926, article id 2611879Article in journal (Refereed)
    Abstract [en]

    This paper targets the lifetime-aware management of a set of optical line amplifiers (OLAs) in an optical network exploiting sleep mode (SM) in order to save energy. We first present a simple model to predict the OLA lifetime. We then provide different mixed-integer linear programming (MILP) formulations, which jointly consider energy saving and lifetime. The proposed MILP formulations are then solved on different realistic scenarios, by taking into account the spatial and temporal variations of traffic demands. Results show that our lifetime-aware approach outperforms classical energy saving ILP formulations, which instead tend to notably decrease the OLA lifetime. More important, the proposed approaches can achieve a good lifetime performance without consuming significantly more energy than purely energy-aware strategies.

  • 85.
    Natalino, Carlos
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Chiaraviglio, Luca
    Idzikowski, Filip
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Listani, Marco
    Carlos, Frances
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Lifetime-Aware Provisioning in Green Optical Backbone Networks2016In: 2016 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), Optical Society of America, 2016Conference paper (Refereed)
    Abstract [en]

    We present a framework able to limit the device lifetime degradation in optical backbone networks using sleep-mode-based green strategies. Results show that our approach manages the lifetime while not compromising significantly the energy saving performance. 

  • 86.
    Natalino, Carlos
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Coelho, Frederico
    Fed Univ Minas Gerais UFMG, Belo Horizonte, MG, Brazil..
    Lacerda, Gustavo
    Fed Univ Minas Gerais UFMG, Belo Horizonte, MG, Brazil..
    Braga, Antonio
    Fed Univ Minas Gerais UFMG, Belo Horizonte, MG, Brazil..
    Wosinska, Lena
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    A Proactive Restoration Strategy for Optical Cloud Networks Based on Failure Predictions2018In: 20th International Conference on Transparent Optical Networks, ICTON 2018 / [ed] Jaworski, M Marciniak, M, Institute of Electrical and Electronics Engineers (IEEE), 2018, article id 8473938Conference paper (Refereed)
    Abstract [en]

    Failure prediction based on the anomaly detection/forecasting is becoming a reality thanks to the introduction of machine learning techniques. The orchestration layer can leverage on this new feature to proactively reconfigure cloud services that might find themselves traversing an element that is about to fail. As a result, the number of cloud service interruptions can be reduced with beneficial effects in terms of cloud service availability. Based on the above intuition, this paper presents an orchestration strategy for optical cloud networks able to reconfigure vulnerable cloud services (i.e., the ones that would be disrupted if a predicted failure happens) before an actual failure takes place. Simulation results demonstrate that, with a single link failure scenario, proactive restoration can lead to up to 97% less cloud services having to be relocated. This result brings considerable benefits in terms of cloud service availability, especially in low load conditions. It is also shown that these improvements come with almost no increase in the cloud service blocking probability performance,i.e., resource efficiency is not impacted.

  • 87.
    Natalino, Carlos
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Idzikowski, F.
    Poznan Univ Tech, Fac Elect & Telecommun, Poznan, Poland.
    Chiaraviglio, L.
    Univ Roma Tor Vergata, EE Dept, Rome, Italy.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    EFAH: An energy and fatigue aware heuristic for provisioning highly available connections in optical backbone networks2017In: Proceedings of 2017 9th International Workshop on Resilient Networks Design and Modeling, RNDM 2017, Institute of Electrical and Electronics Engineers Inc. , 2017Conference paper (Refereed)
    Abstract [en]

    Optical backbone operators need to meet the availability requirements specified in the Service Level Agreements (SLAs). While less stringent availability constraints, i.e., less than three 9's might be met by provisioning connections without any protection, more stringent requirements, i.e., five 9's, force operator to use proactive protection strategies. The connection provisioning process becomes more cost-efficient when green aspects are considered. On the other hand, energy awareness introduces thermal fatigue effects, which may in turn lower the lifetime of devices that undergo frequent power state transitions, i.e., between Active Mode (AM) and Sleep Mode (SM). As a result the availability level experienced by the unprotected connections may decrease. At the same time, with devices failing more frequently the protection level chosen for a given connection might not be enough to guarantee the required average connection availability performance. This work tackles the problem of managing an optical back-bone network when green and thermal fatigue aspects are introduced. We propose an Energy and Fatigue Aware Heuristic (EFAH) that is able to balance between thermal fatigue effects and energy saving performance. When compared to the pure Energy-Aware (EA) strategies, EFAH manages to significantly improve the value of the average connection availability of both unprotected and protected connections. On the other hand, there is a price to pay in terms of lower energy saving performance.

  • 88.
    Natalino, Carlos
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Idzikowski, Filip
    Poznan Univ Tech, Fac Elect & Telecommun, Poznan, Poland..
    Chiaraviglio, Luca
    Univ Roma Tor Vergata, EE Dept, Rome, Italy..
    Wosinska, Lena
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Energy- and fatigue-aware RWA in optical backbone networks2019In: Optical Switching and Networkning Journal, ISSN 1573-4277, E-ISSN 1872-9770, Vol. 31, p. 193-201Article in journal (Refereed)
    Abstract [en]

    Connection provisioning in Wavelength Division Multiplexing (WDM) networks needs to account for a number of crucial parameters. On the one hand, operators need to ensure the connection availability requirements defined in Service Level Agreements (SLAs). This is addressed by selecting an appropriate amount of backup resources and recovery strategies for the connections over which services are provisioned. Services requiring less strict availability requirements can be routed over unprotected lightpaths. Services with more strict availability requirements are provisioned over protected lightpaths in order to cope with possible failures in the network. Another important aspect to consider during the provisioning process is energy efficiency. Green strategies leverage on setting network devices in Sleep Mode (SM) or Active Mode (AM) depending on whether or not they are needed to accommodate traffic. However, frequent power state changes introduce thermal fatigue which in turn has a negative effect on the device lifetime. Finally, in multi-period traffic scenarios, it is also important to minimize the number of reconfigurations of lightpaths already established in the network in order to avoid possible traffic disruptions at higher layers. The work presented in this paper tackles the connection provisioning paradigm in an optical backbone network with a multi-period traffic scenario. More specifically the paper looks into the interplay among (i) energy efficiency, (ii) thermal fatigue, and (iii) lightpath reconfiguration aspects. To this end, the Energy and Fatigue Aware Heuristic with Unnecessary Reconfiguration Avoidance (EFAH-URA) is introduced, showing that it is possible to balance the three aspects mentioned above in an efficient way. When compared to the pure energy-aware strategies, EFAH-URA significantly improves the average connection availability for both unprotected and protected connections. On the other hand, it is done at the expense of reduced energy saving.

  • 89.
    Natalino, Carlos
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Franca, Luis
    Furdek, Marija
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Frances, Carlos R. L.
    Costa, Joao C. W. A.
    Dimensioning Optical Clouds with Shared-Path Shared-Computing (SPSC) Protection2015In: High Performance Switching and Routing (HPSR), 2015 IEEE 16th International Conference on, IEEE conference proceedings, 2015Conference paper (Refereed)
    Abstract [en]

    Service relocation represents a promising strategy to provide flexible and resource efficient resiliency from link failures in the optical cloud environment. However, when a failure affects a node hosting a datacenter (DC), service relocation from the affected DC is not possible. One alternative to protect against DC failures relies on using design strategies that duplicate the IT (i.e., storage and processing) resources in a backup DC at the expense of increasing resource overbuild (i.e., cost) of the network. This work proposes a dimensioning strategy based on the shared-path shared-computing (SPSC) concept able to protect against any single link, server, or DC failure scenario with minimal resource overbuild for the network and IT infrastructures. SPSC is based on the intuition that only storage units need complete replication in backup DC, while processing units can be instantiated only after the occurrence of a failure, leaving the design strategy some leeway to minimize their number. As result, the proposed SPSC design shows a considerable reduction in the amount of backup resources when compared to the dedicated protection strategies.

  • 90.
    Natalino, Carlos
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Raza, Muhammad Rehan
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    O¨hlen, P.
    Batista, P.
    Santos, M.
    Wosinska, Lena
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Machine-learning-based routing of QoS-constrained connectivity services in optical transport networks2018In: Optics InfoBase Conference Papers, Optical Society of America, 2018Conference paper (Refereed)
    Abstract [en]

    Quality of Service (QoS) constraints are crucial in 5G networks. The paper presents a provisioning strategy for connectivity services with different priorities based on reinforcement learning able to accommodate QoS requirements while maximizing provider profits.

  • 91.
    Natalino, Carlos
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Raza, Muhammad Rehan
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Rostami, A.
    Deutsche Bahn AG, Germany.
    Ohlen, P.
    Ericsson Research, Kista, Sweden.
    Wosinska, Lena
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Machine Learning Aided Orchestration in Multi-Tenant Networks2018In: IEEE Photonics Society Summer Topicals Meeting Series, SUM 2018, Institute of Electrical and Electronics Engineers Inc. , 2018, p. 125-126Conference paper (Refereed)
    Abstract [en]

    Software Defined Networking enables the efficient sharing of a network infrastructure among different tenants, a concept known as network slicing. The paper presents a slicing strategy based on reinforcement learning able to efficiently orchestrate services requested by mobile and cloud tenants. 

  • 92.
    Natalino, Carlos
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Spadaro, Salvatore
    Costa, Joao
    Carlos, Frances
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Restoration in Optical Cloud Networks With Relocation and Services Differentiation2016In: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 8, no 2, p. 100-111Article in journal (Refereed)
    Abstract [en]

    Optical cloud networks allow for the integrated management of both optical and IT resources. In this paradigm, cloud services can be provisioned in an anycast fashion; i.e., only the source node asking for a service is specified, while it is up to the cloud control/management system to select the most suitable destination data center (DC) node. During the cloud service provisioning process, resiliency is crucial in order to guarantee continuous network operations also in the presence of failures. On the one hand, a survivability strategy needs to be able to meet the availability requirements of each specific cloud service, while on the other hand it must be efficient in using backup resources. This paper proposes a restoration-based survivability strategy, which combines the benefits of both cloud service relocation and service differentiation concepts. The former is used to enhance the restorability performance (i.e., the percentage of successfully restored cloud services) offered by restoration, while the latter ensures that critical services are given the proper consideration while backup resources are assigned. The paper proposes both an integer linear programming (ILP) formulation, which guarantees optimal results, and a heuristic, which trades the optimality of the solution achieved by the ILP for faster processing times. Simulation results show that the average service availability and restorability performance obtained by both the ILP and the heuristic are very close to that achievable using a protection-based strategy, but with the inherent benefit, in terms of efficient use of resources, offered by a restoration-based approach.

  • 93. Ohlen, P.
    et al.
    Skubic, B.
    Rostami, A.
    Ghebretensae, Z.
    Martensson, J.
    Wang, K.
    Fiorani, Matteo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Data plane and control architectures for 5G transport networks2015In: European Conference on Optical Communication, ECOC, Institute of Electrical and Electronics Engineers (IEEE), 2015Conference paper (Refereed)
    Abstract [en]

    Next generation 5G mobile system will support the vision of connecting all devices that benefit from a connection. Transport networks need to support the required capacity, latency and flexibility. This paper outlines how 5G transport networks will address these requirements.

  • 94.
    Osorio, Camilo
    et al.
    Univ Estadual Campinas, Sch Elect & Comp Engn, Campinas, SP, Brazil..
    Udalcovs, Aleksejs
    RISE AB, NETLAB, Kista, Sweden..
    Barreto, Andre Noll
    Univ Brasilia, Elect Engn Dept, Brasilia, DF, Brazil..
    Monti, Paolo
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Ozolins, Oskars
    RISE AB, NETLAB, Kista, Sweden..
    Mello, Darli A. A.
    Univ Estadual Campinas, Sch Elect & Comp Engn, Campinas, SP, Brazil..
    Dual-Mode Distance-Adaptive Transceiver Architecture for 5G Optical Fiber Fronthaul2018In: 2018 ADVANCES IN WIRELESS AND OPTICAL COMMUNICATIONS (RTUWO) / [ed] Aboltins, A, IEEE , 2018, p. 29-32Conference paper (Refereed)
    Abstract [en]

    We propose a transceiver architecture for 5G fronthaul that adapts the modulation format according to the channel quality. The proposed solution operates in dual-mode using digital signal processing (DSP)-assisted analog radio-over-fiber (A-RoF) and digital radio-over-fiber (D-RoF) with multiple modulation orders. The system performance is assessed through Monte-Carlo simulations of the optical fiber link conveying wireless waveforms that utilize the filter bank multicarrier (FBMC) and orthogonal frequency-division multiplexing (OFDM) formats. The simulation results highlight the benefits of having both digital and DSP-assisted analog transmission capabilities to optimize the reach versus spectral efficiency trade-off in optical fronthaul.

  • 95. Paolucci, F.
    et al.
    Uceda, V.
    Sgambelluri, Andrea
    KTH, School of Information and Communication Technology (ICT).
    Cugini, F.
    De Dios, O. G.
    Lopez, V.
    Contreras, L. M.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Iovanna, P.
    Ubaldi, F.
    Pepe, T.
    Castoldi, P.
    Interoperable multi-domain delay-aware provisioning using Segment Routing monitoring and BGP-LS advertisement2016In: ECOC 2016 42th European Conference on Optical Communication Proceedings, September 18 - 22, 2016, Düsseldorf, Germany, Institute of Electrical and Electronics Engineers (IEEE), 2016, p. 190-192Conference paper (Refereed)
    Abstract [en]

    This paper demonstrates a multi-domain SDN orchestrator using delay information to provision network services using BGP-LS and a novel monitoring system enabled by Segment Routing. Moreover, it is the first implementation and interoperability of the BGP-LS extensions for TE metrics.

  • 96. Raffaelli, C.
    et al.
    Tonini, F.
    Fiorani, Matteo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Furdek, Marija
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Optimization of Centralized Radio access networks in indoor areas2016In: International Conference on Transparent Optical Networks, Institute of Electrical and Electronics Engineers (IEEE), 2016Conference paper (Refereed)
    Abstract [en]

    A Centralized Radio Architecture (CRA) allows for the coordination of the physical layer functions of macro and small cells. Efficient techniques can be introduced based on the CRA concept, but deployment cost could potentially increase if CRA networks are not carefully designed. This paper proposes a number of design strategies aimed at cost minimization for CRA networks in residential areas based on heuristics which easily scale with the number of indoor antennas. A few different algorithms, which aim at reducing the overall amount of equipment to cover the area, are described and compared.

  • 97.
    Ranaweera, Chathurika
    et al.
    Univ Melbourne, Melbourne, Vic, Australia..
    Monti, Paolo
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Skubic, Björn
    Ericsson Res, Stockholm, Sweden..
    Furdek, Marija
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    Ericsson Res, Stockholm, Sweden..
    Nirmalathas, Ampalavanapillai
    Univ Melbourne, Melbourne, Vic, Australia..
    Lim, Christina
    Univ Melbourne, Melbourne, Vic, Australia..
    Wong, Elaine
    Univ Melbourne, Melbourne, Vic, Australia..
    Optical X-haul Options for 5G Fixed Wireless Access: Which One to Choose?2018In: IEEE INFOCOM 2018 - IEEE CONFERENCE ON COMPUTER COMMUNICATIONS WORKSHOPS (INFOCOM WKSHPS), IEEE , 2018Conference paper (Refereed)
    Abstract [en]

    5G is anticipated to be a significant leap in the evolution of mobile communication. Being designed to facilitate 10 to 100 times more capacity than 4G, 5G is considered to be the most cost-efficient solution to provide Fixed Wireless Access (FWA)to households on a large scale where providing last mile access using wired solution might not be economically viable. With a range of promises to deliver user experience improvements, facilitating cost-efficient data transportation between FWA users and network core still remains an unsolved issue, given the enormous volume of data that will be traversing the superior 5G network. This work addresses this compelling problem by formulating a joint-optimization framework to plan and analyze the optimal deployment of diverse optical x-haul strategies that can be used in 5G-based FWA networks. The work provides a cornerstone for deployment strategies that will be imperative to realize future-proof FWA network.

  • 98.
    Raza, Muhammad Rehan
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Fiorani, Matteo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab). Kungliga Tekniska högskolan.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Demonstration of Dynamic Resource Sharing Benefits in an Optical CRAN2016In: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 8, no 8, p. 621-632Article in journal (Other academic)
    Abstract [en]

    The next generation of mobilecommunication (i.e., 5G) will bring new challengesfor the transport infrastructure, e.g. in terms offlexibility and capacity. The joint orchestration ofradio and transport resources can help to addresssome of these challenges. One example is thepossibility to reconfigure the use of the transportnetwork resources according to the spatial andtemporal variations of the wireless traffic patterns.Using the concept of dynamic resource sharing, alimited pool of transport resources can be sharedamong a large number of radio base stations (RBSs)thus reducing considerably the overall deploymentcost of the transport infrastructure.This paper proposes a provisioning strategy for acentralized radio access network (C-RAN) with anoptical transport whose wavelength resources can bedynamically shared among multiple RBSs. Theproposed strategy utilizes a hierarchical softwaredefined networking (SDN) control plane where aglobal orchestrator optimizes the usage of radio andtransport resources. The benefits of the proposedstrategy are assessed both by simulation and byexperiment via an optical data plane emulatordeveloped for this purpose. It is shown that thedynamic resource sharing can save up to 31.4% oftransport resources compared to a conventionaldimensioning approach, i.e., based onoverprovisioning of wavelength resources.

  • 99.
    Raza, Muhammad Rehan
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Fiorani, Matteo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Rostami, Ahmad
    Ericsson AB, Kista Sweden.
    Skubic, Björn
    Ericsson AB, Kista Sweden.
    Öhlen, Peter
    Ericsson AB, Kista Sweden.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Dynamic Resource Sharing for C-RANs with Joint Orchestration of Radio and Transport2016In: ECOC 2016 42th European Conference on Optical Communication Proceedings, September 18 - 22, 2016, Düsseldorf, Germany, VDE Verlag GmbH, 2016, p. 1001-1003Conference paper (Refereed)
    Abstract [en]

    We present a resource allocation strategy for centralized radio access network architectures able to adapt to the wireless network capacity requirements. Both simulation and emulation results show that it is possible to reuse up to 33.3% of the transport resources.

  • 100.
    Raza, Muhammad Rehan
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Fiorani, Matteo
    Ericsson AB, Kista Sweden.
    Rostami, Ahmad
    Ericsson AB, Kista Sweden.
    Öhlen, Peter
    Ericsson AB, Kista Sweden.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Benefits of Programmability in 5G Transport Networks2017Conference paper (Refereed)
    Abstract [en]

    This paper shows how programmability can improve operators’ revenues and it presents a dynamic resource slicing policy that leads to more than one order of magnitude better resource utilization levels than convectional (static) allocation strategies.

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