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  • 1. Abadal, Sergi
    et al.
    Alarcon, Eduard
    Cabellos-Aparicio, Albert
    Lemme, Max C.
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Nemirovsky, Mario
    Graphene-Enabled Wireless Communication for Massive Multicore Architectures2013In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 51, no 11, 137-143 p.Article in journal (Refereed)
    Abstract [en]

    Current trends in microprocessor architecture design are leading towards a dramatic increase of core-level parallelization, wherein a given number of independent processors or cores are interconnected. Since the main bottleneck is foreseen to migrate from computation to communication, efficient and scalable means of inter-core communication are crucial for guaranteeing steady performance improvements in many-core processors. As the number of cores grows, it remains unclear whether initial proposals, such as the Network-on-Chip (NoC) paradigm, will meet the stringent requirements of this scenario. This position paper presents a new research area where massive multicore architectures have wireless communication capabilities at the core level. This goal is feasible by using graphene-based planar antennas, which can radiate signals at the Terahertz band while utilizing lower chip area than its metallic counterparts. To the best of our knowledge, this is the first work that discusses the utilization of graphene-enabled wireless communication for massive multicore processors. Such wireless systems enable broadcasting, multicasting, all-to-all communication, as well as significantly reduce many of the issues present in massively multicore environments, such as data coherency, consistency, synchronization and communication problems. Several open research challenges are pointed out related to implementation, communications and multicore architectures, which pave the way for future research in this multidisciplinary area.

  • 2. Abu-Lebdeh, Mohammad
    et al.
    Sahoo, Jagruti
    Glitho, Roch
    KTH.
    Tchouati, Constant Wette
    Cloudifying the 3GPP IP Multimedia Subsystem for 4G and Beyond: A Survey2016In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 54, no 1, 91-97 p.Article in journal (Refereed)
    Abstract [en]

    4G systems have been continuously evolving to cope with the emerging challenges of human-centric and M2M applications. Research has also now started on 5G systems. Scenarios have been proposed and initial requirements derived. 4G and beyond systems are expected to easily deliver a wide range of human-centric and M2M applications and services in a scalable, elastic, and cost-efficient manner. The 3GPP IMS was standardized as the service delivery platform for 3G networks. Unfortunately, it does not meet several requirements for provisioning applications and services in 4G and beyond systems. However, cloudifying it will certainly pave the way for its use as a service delivery platform for 4G and beyond. This article presents a critical overview of the architectures proposed so far for cloudifying the IMS. There are two classes of approaches; the first focuses on the whole IMS system, and the second deals with specific IMS entities. Research directions are also discussed. IMS granularity and a PaaS for the development and management of IMS functional entities are the two key directions we currently foresee.

  • 3.
    Ahmed, Jawwad
    et al.
    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).
    Chen, Biao
    Department of Optical Engineering, Zhejiang University.
    Mukherjee, Biswanath
    Efficient Inter-Thread Scheduling Scheme for Long-Reach Passive Optical Networks2013In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 51, no 2, S35-S43 p.Article in journal (Refereed)
    Abstract [en]

    These days there is a clear trend toward extending the reach of passive optical networks to cover large geographical areas, which enables reduction of the number of central offices and hence has the potential of cost saving in network operation. On the other hand, this reach extension necessitates the design of efficient dynamic bandwidth allocation schemes in order to tackle performance degradation caused by the increased propagation delay in long reach PONs. Among many existing approaches, the multi-thread-based DBA scheme where several bandwidth allocation processes are performed in parallel is considered one of the most effective options to improve network performance in LRPONs. We have found that without proper intercommunication between the overlapped threads, multi-thread DBA may lose efficiency and even perform worse than the conventional single-thread algorithm. With this in mind, this article reviews different inter-thread scheduling schemes for LR-PONs, and proposes a novel approach of integrating the key ideas of the existing ones. Extensive simulation results confirm that our proposed scheme can significantly improve DBA performance for LR-PONs under a variety of scenarios with consideration of different values of network load and reach.

  • 4.
    Anton-Haro, Caries
    et al.
    Centre Tecnolo`gic de Telecomunicacions de Catalunya (CTTC, Spain).
    Svedman, Patrick
    KTH, School of Electrical Engineering (EES), Signal Processing.
    Bengtsson, Mats
    KTH, School of Electrical Engineering (EES), Signal Processing.
    Alexiou, Angeliki
    Bell Laboratories, Lucent Technologies (United Kingdom).
    Gameiro, Atilio
    University of Aveiro/Istituto de Telecomunicações (Portugal).
    Cross-layer scheduling for multi-user MIMO systems2006In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 44, no 9, 39-45 p.Article in journal (Refereed)
    Abstract [en]

    The increasing demand of wireless services associated with the scarcity of the radio spectrum and the trend to provide end-to-end QoS in emerging and future applications calls for the design of spectrally efficient systems with QoS support. To fulfill these two requirements of spectral efficiency and QoS provision in the highly dynamic environment of mobile radio requires the collaboration of several layers in the system as well as the use of multiple transmit and receive antennas. In a packet network, one important component to achieve the aforementioned efficiency goals is a properly designed scheduling algorithm. Using an information-theoretic framework, we present an overview of the issues associated with the design of packet scheduling algorithms and review several proposed solutions. The article focuses on the advantages of a cross-layer approach to the resource allocation problem and identifies the trade-offs associated with the increased signaling needs. Also, we thoroughly discuss the additional degrees of freedom that multiple transmit and receive antennas can provide.

  • 5. Astely, D
    et al.
    Dahlman, E
    Fodor, Gabor
    Parkvall, S
    Sachs, J
    LTE release 12 and beyond2013In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 51, no 7, 154-160 p.Article in journal (Refereed)
    Abstract [en]

    As the specification of Release 11 of the LTE standards is approaching its completion, 3GPP is gradually moving its focus toward the next major step in the evolution of LTE. The drivers of the LTE evolution include the increasing demand for mobile broadband services and traffic volumes as well as emerging usage scenarios involving short-range and machine-type communications. In this article we provide an overview of the key technology areas/components that are currently considered by 3GPP for Rel-12, including support for further enhanced local area access by tight interaction between the wide area and local area layers, signaling solutions for wireless local area network integration, multi-antenna enhancements, improved support for massive MTC, and direct device-to-device communications.

  • 6. Boccardi, Federico
    et al.
    Andrews, Jeffrey
    Elshaer, Hisham
    Dohler, Mischa
    Parkvall, Stefan
    KTH, School of Electrical Engineering (EES), Communication Theory. Univ Calif San Diego, San Diego.
    Popovski, Petar
    Singh, Sarabjot
    Why to Decouple the Uplink and Downlink in Cellular Networks and How To Do It2016In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 54, no 3, 110-117 p.Article in journal (Refereed)
    Abstract [en]

    Ever since the inception of mobile telephony, the downlink and uplink of cellular networks have been coupled, that is, mobile terminals have been constrained to associate with the same base station in both the downlink and uplink directions. New trends in network densification and mobile data usage increase the drawbacks of this constraint, and suggest that it should be revisited. In this article we identify and explain five key arguments in favor of downlink/uplink decoupling based on a blend of theoretical, experimental, and architectural insights. We then overview the changes needed in current LTE-A mobile systems to enable this decoupling, and then look ahead to fifth generation cellular standards. We demonstrate that decoupling can lead to significant gains in network throughput, outage, and power consumption at a much lower cost compared to other solutions that provide comparable or lower gains.

  • 7. Boccardi, Federico
    et al.
    Shokri-Ghadikolaei, Hossein
    KTH, School of Electrical Engineering (EES), Communication Networks.
    Fodor, Gabor
    KTH, School of Electrical Engineering (EES), Automatic Control. Ericsson Research, United States.
    Erkip, Elza
    Fischione, Carlo
    KTH, School of Electrical Engineering (EES), Communication Networks.
    Kountouris, Marios
    Popovski, Petar
    Zorzi, Michele
    Spectrum Pooling in MmWave Networks: Opportunities, Challenges, and Enablers2016In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 54, no 11, 33-39 p.Article in journal (Refereed)
    Abstract [en]

    Motivated by the specific characteristics of mmWave technologies, we discuss the possibility of an authorization regime that allows spectrum sharing between multiple operators, also referred to as spectrum pooling. In particular, considering user rate as the performance measure, we assess the benefit of coordination among networks of different operators, study the impact of beamforming at both base stations and user terminals, and analyze the pooling performance at different frequency carriers. We also discuss the enabling spectrum mechanisms, architectures, and protocols required to make spectrum pooling work in real networks. Our initial results show that, from a technical perspective, spectrum pooling at mmWave has the potential to use the resources more efficiently than traditional exclusive spectrum allocation to a single operator. However, further studies are needed in order to reach a thorough understanding of this matter, and we hope that this article will help stimulate further research in this area.

  • 8. Bokhari, S H
    et al.
    Ahmed, M
    bin Sohail, S
    Khan, R H
    Mirza, J A
    Ali, Muhammad
    KTH, Superseded Departments, Electronics.
    A networking laboratory for the developing world2004In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 42, no 2, 106-113 p.Article in journal (Refereed)
    Abstract [en]

    Internet-based communication is assuming an increasingly important role in the developing world. It is thus crucial that students be exposed to contemporary networking equipment in a realistic setting, in order to connect theoretical material taught in lecture courses with the realities of physical hardware. To this end, a large computer networking laboratory has been set up to provide a realistic environment for teaching internetworking concepts. This laboratory provides university-level students with a testbed to experiment with fundamental issues of internetworking in a way that cannot be provided by simulators and to a degree of rigor not possible with the commonly available laboratory setups designed for technicians. We describe the motivations for setting up the laboratory, its network structure and equipment, and the type of experiments students conduct. The laboratory structure is influenced heavily by the limited funds-at our disposal - a common problem in the developing world. Many of the problems we faced in setting up our equipment (such as the crucial impact of proper electrical grounding on system performance) are not ordinarily encountered in developed nations. Our experiences are thus likely to be of value to others in the developing world who are contemplating setting up experimental facilities for teaching networking.

  • 9.
    Buchegger, Sonja
    et al.
    UC Berkeley.
    Le Boudec, Jean-Yves
    EPFL.
    Self-policing mobile ad-hoc networks by reputation systems2005In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 43, no 7, 101-107 p.Article in journal (Refereed)
    Abstract [en]

    Node misbehavior due to selfish or malicious reasons or faulty nodes can significantly degrade the performance of mobile ad-hoc networks. To cope with misbehavior in such self-organized networks, nodes need to be able to automatically adapt their strategy to changing levels of cooperation. Existing approaches such as economic incentives or secure routing by cryptography alleviate some of the problems, but not all. We describe the use of a self-policing mechanism based on reputation to enable mobile ad-hoc networks to keep functioning despite the presence of misbehaving nodes. The reputation system in all nodes makes them detect misbehavior locally by observation and use of second-hand information. Once a misbehaving node is detected it is automatically isolated from the network. We classify the features of such reputation systems and describe possible implementations of each of them. We explain in particular how it is possible to use second-hand information while mitigating contamination by spurious ratings.

  • 10.
    Cavdar, Cicek
    et al.
    Istanbul Technical University.
    Gencata, Aysegul
    Mukherjee, Biswanath
    CATZ: Time-zone-aware Bandwidth Allocation in Layer 1 VPNs2007In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 45, no 4, 60-66 p.Article in journal (Refereed)
    Abstract [en]

    The layer 1 virtual private network framework has emerged from the need to enable the dynamic coexistence of multiple circuit-switched client networks over a common physical network infrastructure. Such a VPN could be set up for an enterprise with offices across a wide geographical area (e.g., around the world or by a global ISP). Additionally, emerging IP over optical WDM technologies let IP traffic be carried directly over the optical WDM layer. Thus, different VPNs can share a common optical WDM core, and may demand different amounts of bandwidth at different time periods. This type of operation would require dynamic and reconfigurable allocation of bandwidth. This article evaluates the state of the art in layer I VPNs in the context of globally deployable optical networks and cost-efficient dynamic bandwidth usage. While exploiting the dynamism of IP traffic in a global network in which the nodes are located in different time zones, we study different bandwidth allocation methods for setting up a worldwide layer 1 VPN. We propose and investigate the characteristics of a cost-efficient bandwidth provisioning and reconfiguration algorithm, called Capacity Allocation Using Time Zones (CATZ).

  • 11.
    Chen, Jiajia
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Gong, Yu
    Fiorani, Matteo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Aleksic, Slavisa
    Optical Interconnects at the Top of the Rack for Energy-Efficient Data Centers2015In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 53, no 8, 140-148 p.Article in journal (Refereed)
    Abstract [en]

    The growing popularity of cloud and multimedia services is dramatically increasing the traffic volume that each data center needs to handle. This is driving the demand for highly scalable, flexible, and energy-efficient networks inside data centers, in particular for the edge tier, which requires a large number of interconnects and consumes the dominant part of the overall power. Optical fiber communication is widely recognized as the highest energy-and cost-efficient technique to offer ultra-large capacity for telecommunication networks. It has also been considered as a promising transmission technology for future data center applications. Taking into account the characteristics of the traffic generated by the servers, such as locality, multi-cast, dynamicity, and burstiness, the emphasis of the research on data center networks has to be put on architectures that leverage optical transport to the greatest possible extent. However, no feasible solution based on optical switching is available so far for handling the data center traffic at the edge tier. Therefore, apart from conventional optical switching, we investigate a completely different paradigm, passive optical interconnects, and aim to explore the possibility for optical interconnects at the top of the rack. In this article, we present three major types of passive optical interconnects and carry out a performance assessment with respect to the ability to host data center traffic, scalability, optical power budget, complexity of the required interface, cost, and energy consumption. Our results have verified that the investigated passive optical interconnects can achieve a significant reduction of power consumption and maintain cost at a similar level compared to its electronic counterpart. Furthermore, several research directions on passive optical interconnects have been pointed out for future green data centers.

  • 12.
    Chen, Jiajia
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Machuca, C.
    Jaeger, M.
    Cost vs. reliability performance study of fiber access network architectures2010In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 48, no 2, 56-65 p.Article in journal (Refereed)
    Abstract [en]

    Fiber to the home is the future-proof technology for broadband access networks. Several fiber access network architectures have been developed (e.g., point-to-point, active optical network, and passive optical network). PON is considered the most promising solution due to the relatively low deployment cost and high resource efficiency. Meanwhile, because of the growing demand for reliable service delivery, fault management is becoming more significant in all parts of communications networks. However, there is a trade-off between the cost of protection and the level of service reliability. Since economical aspects are most critical in the access part of networks, improving reliability performance by duplication of network resources (and capital expenditures) could be too expensive. Therefore, recent work has focused on PON protection schemes with reduced CAPEX. The future trend will probably migrate toward minimizing operational expenditures during the access network lifetime. The main contributions of this article include providing a general method for CAPEX and OPEX analysis that can be applied to any type of fiber access network with consideration of changed component cost in time and variable take rates, and comparing the total cost (i.e., sum of CAPEX and OPEX) for the selected representative architectures with and without protection for business and residential users in relation to reliability performance. The aim is to give a guideline for the design of the most cost-effective protection schemes, while maintaining acceptable service reliability.

  • 13. Chiaraviglio, Luca
    et al.
    Wiatr, Pawel
    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).
    Lorincz, Josip
    Idzikowski, Filip
    Listanti, Marco
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Is Green Networking Beneficial in Terms of Device Lifetime?2015In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 53, no 5, 232-240 p.Article in journal (Refereed)
    Abstract [en]

    This article analyzes the impact that sleep mode (SM)-based green strategies have on the reliability performance of optical and cellular network elements. First, we consider a device in isolation (i. e., not plugged into a network in operation), showing how operational temperature and temperature variations, both introduced by SM, impact its lifetime. We then evaluate, from an operational cost perspective, the impact of these lifetime variations, showing that some devices are critical, that is, their achievable energy savings might not cover the potential additional reparation costs resulting from being put in SM too frequently. Moreover, we present a model for evaluating the impact of SM on the lifetime of a device plugged into an operational network. The analysis considers two case studies (one based on the optical backbone and one on cellular networks) showing that the lifetime of a device is influenced by both the hardware parameters, which depend on the specific design of the device, and the SM parameters, which instead depend on the energy-efficient algorithm used, the network topology, and the traffic variations over time. Our results show that (i) the changes in the operational temperature and the frequency of their variation are two crucial aspects to consider while designing a SM-based green strategy, and (ii) the impact of a certain SM-based strategy on the lifetime of network devices is not homogeneous (i. e., it can vary through the network).

  • 14.
    Costa, J.
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Miao, Guowang
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Zander, Jens
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Context-Aware Framework for Energy Efficient Machine-to-Machine CommunicationsIn: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896Article in journal (Refereed)
    Abstract [en]

    Cellular network based Machine-to-Machine(M2M) communications have been growing rapidly in recentyears, being used in a wide range of services such as security,metering, health, remote control, tracking and so on. A criticalissue that needs to be considered in M2M communications isthe energy efficiency, typically the machines are powered bybatteries of low capacity and it is important to optimize the waythe power is consumed. In search of better M2M systems, wepropose a context-aware framework for M2M communicationsso the machine type communication (MTC) devices dynamicallyadapt their settings depending on a series of characteristicssuch as data reporting mode and quality of service (QoS)features so higher energy efficient is achieved, extending theoperating lifetime of the M2M network. Simulations results willbe provided for four commonly used M2M applications: homesecurity, telehealth, climate and smart metering, showing thatconsiderable energy savings and operating lifetime extension onthe network can be achieved. Thus, contexts play an importantrole on the energy efficiency of a M2M system.

  • 15.
    Dahlman, Erik B.
    et al.
    KTH.
    Jou, Y. -C
    Further evolution of 3G radio access2006In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 44, no 3, 34-35 p.Article in journal (Refereed)
  • 16. De Andrade, Marilet
    et al.
    Kramer, Glen
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101).
    Chen, Jiajia
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101).
    Sallent, Sebastia
    Mukherjee, Biswanath
    Evaluating Strategies for Evolution of Passive Optical Networks2011In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 49, no 7, 176-184 p.Article in journal (Refereed)
    Abstract [en]

    Rapidly-increasing traffic demands will require the upgrade of optical access networks, namely deployed Passive Optical Networks (PONs), which may soon face capacity exhaustion. Such upgrade options must consider several technical and cost factors for evolution toward a shared multiple-channel PON using Wavelength-Division Multiplexing (WDM). WDM can facilitate the seamless upgrade of PONs, since capacity can be increased by adding new wavelength channels. We study the requirements for optimal migration toward higher bandwidth per user, and examine scenarios and cost-effective solutions for PON evolution.

  • 17. Derksen, Rainer. H.
    et al.
    Westergren, Urban
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
    Chacinski, Marek
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
    Schubert, Colja
    Bach, Heinz-Gunter
    Driad, Rachid
    Hurm, Volker
    Makon, Robert E.
    Li, Jie
    Steffan, Andreas G.
    Cost-Efficient High-Speed Components for 100 Gigabit Ethernet Transmission on One Wavelength Only: Results of the HECTO Project2013In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 51, no 5, 136-144 p.Article in journal (Refereed)
    Abstract [en]

    In 2010, the standard for 100GbE was approved, which specifies the transmission of 100 Gb/s via 4 wavelength channels of 25 Gb/s each. A solution based on a 100 Gb/s single wavelength channel is capable of significant cost reductions should the required components be available. Within the HECTO project, we developed components suitable for single-wavelength 100 Gb/s transmission. In this article, the project is described - its organization, objectives, possible impacts, and results - including the successful demonstration in a final field trial. A complete ETDM system utilizing the monolithically integrated transmitter and receiver modules developed in the project was built to transmit 112 Gb/s over 42 km standard single-mode fiber. Finally, we attempt an outlook on the prospective development of Ethernet standardization beyond 100GbE.

  • 18.
    Dinc, Ergin
    et al.
    KTH, School of Information and Communication Technology (ICT).
    Vondra, Michal
    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.
    Hofmann, Sandra
    Schupke, Dominic
    Prytz, Mikael
    Bovelli, Sergio
    Frodigh, Magnus
    Zander, Jens
    Cavdar, Cicek
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
    In-Flight Broadband Connectivity: Architectures and Business Models for High Capacity Air-to-Ground Communications2017In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, no 9, 142-149 p.Article in journal (Refereed)
    Abstract [en]

    In-Flight Broadband Connectivity (IFBC) is a significant open market for mobile network operators, considering that more than 3.3 billion passengers were served by airlines in 2015. On-board broadband services are provided via air-to-ground (A2G) connectivity through direct A2G communication (DA2GC) and satellite A2G communication (SA2GC). Available on-board connectivity systems have significant limitations: high latency in SA2GC and low capacity in DA2GC. The customer expectancy is multi-Mb/s connections in every seat, which leads to capacity requirements of Gb/s to the aircraft. Creation of high capacity IFBC requires a collaborative interaction between different industry partners. For this reason, we investigate A2G architectures in terms of economic and technical perspectives, and propose business models by identifying new roles and positioning them in the A2G business ecosystem. In addition, we provide an extensive summary of the state-of-the-art and future improvements for A2G communications.

  • 19.
    Dán, György
    et al.
    KTH, School of Electrical Engineering (EES), Communication Networks.
    Hossfeld, Tobias
    Oechsner, Simon
    Cholda, Piotr
    Stankiewicz, Rafal
    Papafili, Ioanna
    Stamoulis, George D.
    Interaction Patterns between P2P Content Distribution Systems and ISPs2011In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 49, no 5, 222-230 p.Article in journal (Refereed)
    Abstract [en]

    Peer-to-peer (P2P) content distribution systems are a major source of traffic in the Internet, but the application layer protocols they use are mostly unaware of the underlying network in accordance with the layered structure of the Internet's protocol stack. Nevertheless, the need for improved network efficiency and the business interests of Internet service providers (ISPs) are both strong drivers toward a cross-layer approach in peer-to-peer protocol design, calling for P2P systems that would in some way interact with the ISPs. Recent research shows that the interaction, which can rely on information provided by both parties, can be mutually beneficial. In this article we first give an overview of the kinds of information that could potentially be exchanged between the P2P systems and the ISPs, and discuss their usefulness and the ease of obtaining and exchanging them. We also present a classification of the possible approaches for interaction based on the level of involvement of the ISPs and the P2P systems, and we discuss the potential strengths and the weaknesses of these approaches.

  • 20.
    Elek, Viktoria
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Fumagalli, A.
    Wedzinga, G.
    Photonic slot routing: A cost-effective approach to designing all-optical access and metro networks2001In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 39, no 11, 164-172 p.Article in journal (Refereed)
    Abstract [en]

    In the backbone network, the high level of traffic aggregation achieved by numerous users is efficiently served by means of optical circuit switched solutions - the so-called wavelength routing approach. In the access and metro networks, on the contrary, the reduced level of traffic aggregation makes wavelength routing solutions inadequate. The finer and more dynamic bandwidth allocation provided by packet-interleaved optical time-division multiplexing is thus advocated in these network areas. This article presents a survey of an OTDM approach, known as photonic slot routing, or PSR for short. It will be illustrated how this approach may provide a cost-effective solution to deploying all-optical access and metro networks with today's technology.

  • 21.
    Ergin, Dinc
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Vondra, Michal
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Hofmann, Sandra
    Schupke, Dominic
    Prytz, Mikael
    Bovelli, Sergio
    Frodigh, Magnus
    Zander, Jens
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Cavdar, Cicek
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    In-Flight Broadband Connectivity: Architectures and Business Models for High Capacity Air-to-Ground Communications2017In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896Article in journal (Refereed)
    Abstract [en]

    In-flight broadband connectivity (IFBC) is a significant open market for mobile network operators considering more than 3.3 billion passengers being served by airlines in2015. On-board broadband services are provided via air-to-ground(A2G) connectivity through direct A2G communications(DA2GC) and satellite A2G communications (SA2GC). Available on-board connectivity systems have significant limitations: high latency in SA2GC and low capacity in DA2GC. The customer expectancy is multi-Mbps connections in every seat which leads to capacity requirements of Gbps to the aircraft. Creation of high capacity IFBC requires a collaborative interaction between different industrial partners. For this reason, we investigate A2Garchitectures in terms of economic and technical perspectives, and propose business models by identifying new roles and positioning them in the A2G business ecosystem. In addition, we provide an extensive summary of the state-of-the-art and future improvements for A2G communications.

  • 22. Fodor, G
    et al.
    Dahlman, E
    Parkvall, S
    Mildh, G
    Reider, N
    Miklos, G
    Turanyi, Z
    Design Aspects of Network Assisted Device-to-Device Communications2012In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 50, no 3, 170-177 p.Article in journal (Refereed)
    Abstract [en]

    Device-to-device (D2D) communications underlaying a cellular infrastructure has been proposed as a means of taking advantage of the physical proximity of communicating devices, increasing resource utilization, and improving cellular coverage. Relative to the traditional cellular methods, there is a need to design new peer discovery methods, physical layer procedures, and radio resource management algorithms that help realize the potential advantages of D2D communications. In this article we use the 3GPP Long Term Evolution system as a baseline for D2D design, review some of the key design challenges, and propose solution approaches that allow cellular devices and D2D pairs to share spectrum resources and thereby increase the spectrum and energy efficiency of traditional cellular networks. Simulation results illustrate the viability of the proposed design.

  • 23.
    Fodor, Gabor
    et al.
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Rajatheva, N.
    Zirwas, W.
    Thiele, L.
    Kurras, M.
    Guo, K.
    Tolli, A.
    Sorensen, J. H.
    Carvalho, E. D.
    An Overview of Massive MIMO Technology Components in METIS2017In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, no 6, 155-161 p., 7946939Article in journal (Refereed)
    Abstract [en]

    As the standardization of full-dimension MIMO systems in the Third Generation Partnership Project progresses, the research community has started to explore the potential of very large arrays as an enabler technology for meeting the requirements of fifth generation systems. Indeed, in its final deliverable, the European 5G project METIS identifies massive MIMO as a key 5G enabler and proposes specific technology components that will allow the cost-efficient deployment of cellular systems taking advantage of hundreds of antennas at cellular base stations. These technology components include handling the inherent pilot-data resource allocation trade-off in a near optimal fashion, a novel random access scheme supporting a large number of users, coded channel state information for sparse channels in frequency-division duplexing systems, managing user grouping and multi-user beamforming, and a decentralized coordinated transceiver design. The aggregate effect of these components enables massive MIMO to contribute to the METIS objectives of delivering very high data rates and managing dense populations.

  • 24.
    Fodor, Viktória
    et al.
    KTH, School of Electrical Engineering (EES), Communication Networks.
    Dán, György
    KTH, School of Electrical Engineering (EES), Communication Networks.
    Resilience in live peer-to-peer streaming2007In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 45, no 6, 116-123 p.Article in journal (Refereed)
    Abstract [en]

    The success of peer-to-peer overlays for live multicast streaming depends on their ability to maintain low delays and a low ratio of information loss end-to-end. However, data distribution over an overlay consisting of unreliable peers is inherently subject to disturbances. Resilience is thus inevitably a key requirement for peer-to-peer live-streaming architectures. In this article, we present a survey of the media distribution methods, overlay structures, and error-control solutions proposed for peer-to-peer live streaming. We discuss the trade off between resilience and overhead and argue that efficient architectures can be defined only through thorough performance analysis.

  • 25. Fu, C.
    et al.
    Glitho, Roch
    KTH, School of Information and Communication Technology (ICT). Ericsson Telecom AB, Sweden.
    Khendek, F.
    A cross-layer architecture for signaling in multihop cellular networks2008In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 46, no 9, 174-182 p.Article in journal (Refereed)
    Abstract [en]

    Multihop cellular networks (MCNs) combine traditional single-hop cellular networks with ad hoc networks. They have emerged recently as an active research topic due to their throughput advantages and low cost. Most of the research on MCNs has been focused on lower-layer issues such as routing. Application layer issues in MCNs are seldom addressed. In this article we tackle one of these issues: signaling for conferencing. Conferencing enables a range of "killer" applications such as videoconferencing, gaming, and distance learning. Signaling is a critical component that handles session initiation, modification, and termination. We have proposed a general signaling architecture for integrated 3G/MANETs that is applicable to the specific case of MCNs. This architecture is based on application- layer clusters and faces several performance drawbacks. This article focuses on optimizing the architecture performance for the specific environment of an MCN. We first present this MCN environment and discuss conferencing scenarios. We propose an optimization architecture based on cross-layer design, which is then compared to the existing proposals, followed by a set of optimization schemes. The article also discusses initial evaluation results.

  • 26. G, Eneroth
    et al.
    G, Fodor
    G, Leijonhufvud
    A, Rácz
    I, Szabó
    Applying ATM/AAL2 as a switching technology in third-generation mobile access networks1999In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 37, no 6, 112-122 p.Article in journal (Refereed)
    Abstract [en]

    In this article we focus on the transport and switching part of third-generation mobile access networks and outline some important aspects of applying ATM in these networks. In particular, we argue that in order for the mobile access network to support low-bit-rate delay-sensitive traffic consisting of short packets, the standardization of a new ATM adaptation layer, AAL2, and associated signaling protocol has been necessary. The AAL2 protocol has been designed to support low-bit-rate delay-sensitive services (typically compressed voice) where other adaptation layers fail to deliver the required QoS and maintain efficient resource utilization at the same time. Furthermore, in order to provide mobility and soft handover support in CDMA-based mobile networks such as UMTS or IMT-2000, there is also a strong demand for fast connection establishment and release. Therefore, when designing ATM-based cellular access networks some specific architectural and traffic management issues need to be addressed.

  • 27. G, Fodor
    et al.
    A, Eriksson
    A, Tuoriniemi
    Providing quality of service in always best connected networks2003In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 41, no 7, 154-163 p.Article in journal (Refereed)
  • 28.
    Ghanbari, Amirhossein
    et al.
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Laya, Andres
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Alonso-Zarate, J.
    Markendahl, Jan
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Business Development in the Internet of Things: A Matter of Vertical Cooperation2017In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, no 2, 135-141 p., 7842424Article in journal (Refereed)
    Abstract [en]

    Smart and connected devices can improve industrial processes, and generate new and better services. While this premise is well understood within the ICT industry, there is a challenge in extending this knowledge to vertical industries. The potential of the Internet of Things lies in the interaction among industries working together toward value co-creation. Firms need to look beyond their internal business models and explore cooperative perspectives to define new business opportunities. In this article, we look into the relevance of vertical cooperation in the area of IoT and highlight the need to develop new value networks that leverage this cooperation and enable the creation of new business models. To lead our discussions, we use the examples of two major building blocks of smart cities: intelligent transport systems and health and well being services based on connected devices and solutions.

  • 29. Gonzales Prieto, Alberto
    et al.
    Gillblad, Daniel
    Steinert, Rebecca
    SICS.
    Miron, Avi
    Toward Decentralized Probabilistic Management2011In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 49, no 7, 80-96 p.Article in journal (Refereed)
    Abstract [en]

    In recent years, data communication networks have grown to immense size and have been diversified by the mobile revolution. Existing management solutions are based on a centralized deterministic paradigm, which is appropriate for networks of moderate size operating in relatively stable conditions. However, it is becoming increasingly apparent that these management solutions are not able to cope with the large dynamic networks that are emerging. In this article, we argue that the adoption of a decentralized and probabilistic paradigm for network management will be crucial to meet the challenges of future networks, such as efficient resource usage, scalability, robustness, and adaptability. We discuss the potential of decentralized probabilistic management and its impact on management operations, and illustrate the paradigm by three example solutions for real-time monitoring and anomaly detection.

  • 30. Hu, Wendong
    et al.
    Willkomm, Daniel
    TU Berlin.
    Abusubaih, Murad
    TU Berlin.
    Gross, James
    Technical University Berlin.
    Vlantis, George
    Gerla, Mario
    UCLA.
    Wolisz, Adam
    TU Berlin.
    Dynamic Frequency Hopping Communities for Efficient IEEE 802.22 Operation2007In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 45, no 5, 80-87 p.Article in journal (Refereed)
    Abstract [en]

    One of the key challenges of the emerging cognitive radio-based IEEE 802.22 wireless regional area networks (WRANs) is to address two apparently conflicting requirements: ensuring QoS satisfaction for WRAN services while providing reliable spectrum sensing for guaranteeing licensed user protection. To perform reliable sensing, in the basic operation mode on a single frequency band (non-hopping mode), one must allocate quiet times, that is, periodically interrupt data transmission that could impair the QoS of WRAN. This critical issue can be addressed by an alternative operation mode proposed in 802.22 called dynamic frequency hopping (DFH), where WRAN data transmission is performed in parallel with spectrum sensing without interruptions. DFH community, as described in this article, is a mechanism that coordinates multiple WRAN cells operating in the DFH mode, such that efficient frequency usage and reliable channel sensing are achieved. The key idea of DFH community is that neighboring WRAN cells form cooperating communities that coordinate their DFH operations.

  • 31. John, W.
    et al.
    Kern, A.
    Kind, M.
    Sköldström, Pontus
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Network Systems Laboratory (NS Lab).
    Staessens, D.
    Woesner, H.
    Splitarchitecture: SDN for the carrier domain2014In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 52, no 10, 146-152 p., 6917416Article in journal (Refereed)
    Abstract [en]

    The concept of SDN has emerged as a way to address numerous challenges with traditional network architectures by decoupling network control and forwarding. So far, the use cases for SDN mainly targeted data-center applications. This article considers SDN for network carriers, facing operation of large-scale networks with millions of customers, multiple technologies, and high availability demands. With specific carriergrade features such as scalability, reliability, flexibility, modularity, and virtualization in mind, the SPARC EU project has developed the SPARC SplitArchitecture concept. The SplitArchitecture control plane allows hierarchical layering of several control plane layers which can be flexibly mapped to data plane layers. Between control layers open interfaces are used. Furthermore, SplitArchitecture proposes an additional split of forwarding and processing functions in data path elements, enabling switch based OAM functionality and handling of tunneling techniques. The SplitArchitecture concept is evaluated in a prototype demonstrating an SDN version of BRAS: the floating BRAS. The floating BRAS allows creation of residential Internet access services with dynamically managed BRAS instances. The demo is based on a controller enabling protected MPLS transport connections spanning SDN-controlled aggregation and IP/MPLS-based core domains. The prototype showcases how SplitArchitecture enables virtualization of service nodes in an SDN-controlled network, leading to increased flexibility in configuration and placement of service creation functions. Overall, the results show that it is technically and economically beneficial to apply SDN, and specifically the SplitArchitecture concept, to the carrier domain.

  • 32.
    Jorswieck, Eduard A.
    et al.
    KTH.
    Badia, Leonardo
    Fahldieck, Torsten
    Karipidis, Eleftherios
    Luo, Jian
    Spectrum Sharing Improves the Network Efficiency for Cellular Operators2014In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 52, no 3, 129-136 p.Article in journal (Refereed)
    Abstract [en]

    The article describes the potential gain by spectrum sharing between cellular operators in terms of network efficiency. The focus of the study is on a specific resource sharing scenario: spectrum sharing between two operators in cellular downlink transmission. If frequency bands are allocated dynamically and exclusively to one operator - a case called orthogonal spectrum sharing - significant gains in terms of achievable throughput (spectrum sharing gains between 50 percent and 100 percent) and user satisfaction are reported for asymmetric scenarios at link and system level as well as from two hardware demonstrators. Additionally, if frequency bands are allocated simultaneously to two operators - a case called non-orthogonal spectrum sharing - further gains are reported. In order to achieve these, different enablers from hardware technologies and base station capabilities are required. However, we argue that all requirements are fulfilled in 3GPP and newer mobile standards. Therefore, the results and conclusions of this overview article encourage to seriously consider the inter-operator spectrum sharing technologies.

  • 33.
    Juntti, Markku
    et al.
    Department of Electrical and Information Engineering, University of Oulu.
    Vehkaperä, Mikko
    KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Leinonen, Jouko
    Li, Zexian
    Tujkovic, Djordje
    Tsumura, Shigehiko
    Hara, Shinsuke
    Graduate School of Engineering, Osaka City University .
    MIMO MC-CDMA communications for future cellular systems2005In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 43, no 2, 118-124 p.Article in journal (Refereed)
  • 34.
    Kang, Du Ho
    et al.
    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.
    Sung, Ki Won
    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.
    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.
    High capacity indoor and hotspot wireless systems in shared spectrum: A techno-economic analysis2013In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 51, no 12, 102-109 p.Article in journal (Refereed)
    Abstract [en]

    Predictions for wireless and mobile Internet access suggest an exponential traffic increase, particularly in in-building environments. Non-traditional actors such as facility owners have a growing interest in deploying and operating their own indoor networks to fulfill the capacity demand. Such local operators will need spectrum sharing with neighboring networks because they are not likely to have their own dedicated spectrum. Management of internetwork interference then becomes a key issue for high capacity provision. Tight operator-wise cooperation provides superior performance, but at the expense of high infrastructure cost and business-related impairments. Limited coordination, on the other hand, causes harmful interference between operators, which in turn will require even denser networks. In this article, we propose a techno-economic analysis framework for investigating and comparing indoor operator strategies. We refine a traditional network cost model by introducing new inter-operator cost factors. Then we present a numerical example to demonstrate how the proposed framework can help us to compare different operator strategies. Finally, we suggest areas for future research.

  • 35. Kargl, F.
    et al.
    Papadimitratos, Panos
    Buttyan, L.
    Müter, M.
    Wiedersheim, B.
    Schoch, E.
    Thong, T. -V
    Calandriello, G.
    Held, A.
    Kung, A.
    Hubaux, J. -P
    Secure Vehicular Communication Systems: Implementation, Performance, and Research Challenges2008In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 46, 110-118 p.Article in journal (Refereed)
  • 36.
    Lei, Zhu
    et al.
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Ben Slimane, Slimane
    KTH, Superseded Departments, Signals, Sensors and Systems.
    A multicarrier allocation (MCA) scheme for variable-rate 3Gwireless systems2000In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 38, no 10, 86-91 p.Article in journal (Refereed)
    Abstract [en]

    High spectral efficiency and flexible data rate access are the main focus of future wireless networks. Multiple channel allocation schemes have the potential of achieving this goal. By assigning multiple slots and/or multiple carriers to one user, it is possible to provide a flexible data rate with quite low complexity. In this article we propose a simple allocation scheme where each user is assigned a fixed group of carriers. These carriers are adaptively used depending on the interference situation within the system. The system performance in terms of average throughput is investigated for two different types of allocation schemes: a fully centralized scheme and a distributed one that uses frequency diversity as a mean of improving the user link quality. The obtained results show that both schemes improve the system throughput over single carrier allocation without affecting the capacity of the system in terms of number of users per cell.

  • 37. 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, 6-7 p., 7823325Article in journal (Other academic)
  • 38. MacHuca, C. M.
    et al.
    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-efficient protection in TDM PONs2012In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 50, no 8, 110-117 p.Article in journal (Refereed)
    Abstract [en]

    Reliability in optical access networks is becoming a crucial issue for both operators and users due to the enormous increase of capacity and the importance of uninterrupted access to network services. Consequently, the growing number of users requesting penalties for connection interruptions is motivating for investing in protection mechanisms in fiber access networks. The investments involved depend on several aspects such as technology and covered area (population density, distance, type of users, etc.). Moreover, the passive optical network is considered one of the most beneficial fiber access solutions from the capital expenditures point of view; in particular, we are witnessing a wide deployment of TDM PONs. Keeping in mind that cost is a major issue in the access part of the network, in this article we propose a cost-efficient way to provide protection in a TDM PON considering different deployment scenarios in respect to population density in the access network area. The cost efficiency is obtained by taking advantage of investment cost reduction caused by sharing the same duct by both working and protection fibers. In order to evaluate the investment associated with the deployment of the proposed protection schemes, we take into account three different approaches: provide protection in the access network from the beginning, invest initially on an unprotected architecture keeping in mind a future upgrade with protection resources, and roll out an unprotected access network and, if needed in the future, invest in deployment of protection resources. The cost parameters considered in this article include investment in the infrastructure and installation, as well as the operational expenditures associated with failure reparation and service interruption penalties. Our results confirm that the proposed reliable PON architectures can achieve significant reduction of service interruption at very low increase in investment cost, leading to a great decrease of the total cost of ownership. Finally, some useful guidance for cost-efficient deployment of protection in fiber access networks is provided along with a sensitivity study to point out the key cost factors.

  • 39.
    Magnusson, Christer
    KTH.
    Shareholder Value and Security investments2005In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 43, no 1, 3-4 p.Article in journal (Refereed)
  • 40.
    Mahloo, Mozhgan
    et al.
    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).
    Dixit, Abhishek
    Lannoo, Bart
    Colle, Didier
    Machuca, Carmen Mas
    Toward Reliable Hybrid WDM/TDM Passive Optical Networks2014In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 52, no 2, S14-S23 p.Article in journal (Refereed)
    Abstract [en]

    Individual users and enterprises are increasingly relying on the access to internet services and cannot accept long interruption time as easily as before. Moreover, the main characteristics of next generation optical access (NGOA) networks, such as long reach and a large number of users per feeder line, turn the network reliability to an important design parameter to offer uninterrupted service delivery. In this regard, protection mechanisms become one of the crucial aspects that need to be considered in the design process of access networks. On the other hand, it should be noted that not all users can afford to pay a high extra cost for protection; hence, it is important to provide resilience in a cost-efficient way. A PON combining WDM and TDM technologies, referred to as hybrid WDM/TDM PON or HPON, is one of the most promising candidates for NGOA networks due to its ability to serve a large number of subscribers and offer high capacity per user. For these reasons, in this article, we propose HPON architecture offering different degrees of resilience depending on the user profiles (i.e., partial and full protection for residential and business access, respectively). Also, the investment cost of providing resilience for the proposed schemes is investigated considering various protection upgrade road maps. Our results confirm that protecting the shared part of network with a large number of users is required in order to keep the failure impact at an acceptable level, with less than 5 percent increase of investment cost compared to the unprotected case. Meanwhile, the proposed end-to-end protection for business users considerably reduces the risk of service interruption for this type of demanding user without a need to duplicate the deployment cost of an unprotected connection. Furthermore, a sensitivity analysis is performed to investigate the impact of changes in business user percentage and protection upgrade time on the deployment cost. The results may be used as advice on cost-efficient deployment of reliable fiber access networks.

  • 41. Maier, Martin
    et al.
    Chowdhury, Mahfuzulhoq
    Rimal, Bhaskar Prasad
    Van, Dung Pham
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    The Tactile Internet: Vision, Recent Progress, and Open Challenges2016In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 54, no 5, 138-145 p.Article in journal (Refereed)
    Abstract [en]

    The advent of commercially available remote-presence robots may be the precursor of an age of technological convergence, where important tasks of our everyday life will be increasingly done by robots. A very low round-trip latency in conjunction with ultra-high reliability and essentially guaranteed availability for control communications has the potential to move today's mobile broadband experience into the new world of the Tactile Internet for a race with (rather than against) machines. To facilitate a better understanding of the Tactile Internet, this article first elaborates on the commonalities and subtle differences between the Tactile Internet and the Internet of Things and 5G vision. After briefly reviewing its anticipated impact on society and infrastructure requirements, we then provide an up-to-date survey of recent progress and enabling technologies proposed for the Tactile Internet. Given that scaling up research in the area of future wired and wireless access networks will be essential for the Tactile Internet, we pay particular attention to the latency and reliability performance gains of fiber-wireless (FiWi) enhanced LTE-Advanced heterogeneous networks and their role for emerging cloudlets, mobile-edge computing, and cloud robotics. Finally, we conclude by outlining remaining open challenges for the Tactile Internet.

  • 42. Martinez, Ricardo
    et al.
    Pinart, Carolina
    Cugini, Filippo
    Andriolli, Nicola
    Valcarenghi, Luca
    Castoldi, Piero
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Comellas, Jaume
    Junyent, Gabriel
    Challenges and requirements for introducing impairment-awareness into the management and control planes of ASON/GMPLS WDM networks2006In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 44, no 12, 76-85 p.Article in journal (Refereed)
    Abstract [en]

    The absence of electrical regenerators in transparent WDM networks significantly contributes to reduce the overall network cost. In transparent WDM networks, a proper resource allocation requires that the presence of physical impairments in Routing and Wavelength Assignment (RWA) and lightpath provisioning be taken into account. In this article a centralized, a hybrid centralized-distributed and two distributed approaches that integrate information about most relevant physical impairments in RWA and lightpath provisioning are presented and assessed. Both centralized and hybrid approaches perform a centralized path computation at the management-plane level, utilizing physical impairment information, while the lightpath provisioning is done by the management plane or the control plane, respectively. The distributed approaches fall entirely within the scope of the ASON/GMPLS control plane. For these two approaches, we provide functional requirements, architectural functional blocks, and protocol extensions for implementing either an impairment-aware real-time RWA, or a lighpath provisioning based on impairment-aware signaling.

  • 43. Orsino, Antonino
    et al.
    Ometov, Aleksandr
    Fodor, Gabor
    KTH, School of Electrical Engineering (EES), Automatic Control. Ericsson Research.
    Moltchanov, Dmitri
    Militano, Leonardo
    Andreev, Sergey
    Yilmaz, Osman N. C.
    Tirronen, Tuomas
    Torsner, Johan
    Araniti, Giuseppe
    Iera, Antonio
    Dohler, Mischa
    Koucheryavy, Yevgeni
    Effects of Heterogeneous Mobility on D2D- and Drone-Assisted Mission-Critical MTC in 5G2017In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, no 2, 79-87 p.Article in journal (Refereed)
    Abstract [en]

    mcMTC is starting to play a central role in the industrial Internet of Things ecosystem and have the potential to create high-revenue businesses, including intelligent transportation systems, energy/ smart grid control, public safety services, and high-end wearable applications. Consequently, in the 5G of wireless networks, mcMTC have imposed a wide range of requirements on the enabling technology, such as low power, high reliability, and low latency connectivity. Recognizing these challenges, the recent and ongoing releases of LTE systems incorporate support for low-cost and enhanced coverage, reduced latency, and high reliability for devices at varying levels of mobility. In this article, we examine the effects of heterogeneous user and device mobility - produced by a mixture of various mobility patterns - on the performance of mcMTC across three representative scenarios within a multi-connectivity 5G network. We establish that the availability of alternative connectivity options, such as D2D links and drone-assisted access, helps meet the requirements of mcMTC applications in a wide range of scenarios, including industrial automation, vehicular connectivity, and urban communications. In particular, we confirm improvements of up to 40 percent in link availability and reliability with the use of proximate connections on top of the cellular-only baseline.

  • 44.
    Osseiran, Afif
    et al.
    Ericsson Research, Sweden.
    Boccardi, F.
    Braun, V.
    Kusume, K.
    Marsch, P.
    Maternia, M.
    Queseth, O.
    Schellmann, M.
    Schotten, H.
    Taoka, H.
    Tullberg, H.
    Uusitalo, M. A.
    Timus, B.
    Fallgren, Mikael
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
    Scenarios for 5G mobile and wireless communications: The vision of the METIS project2014In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 52, no 5, 26-35 p.Article in journal (Refereed)
    Abstract [en]

    METIS is the EU flagship 5G project with the objective of laying the foundation for 5G systems and building consensus prior to standardization. The METIS overall approach toward 5G builds on the evolution of existing technologies complemented by new radio concepts that are designed to meet the new and challenging requirements of use cases today¿s radio access networks cannot support. The integration of these new radio concepts, such as massive MIMO, ultra dense networks, moving networks, and device-to-device, ultra reliable, and massive machine communications, will allow 5G to support the expected increase in mobile data volume while broadening the range of application domains that mobile communications can support beyond 2020. In this article, we describe the scenarios identified for the purpose of driving the 5G research direction. Furthermore, we give initial directions for the technology components (e.g., link level components, multinode/multiantenna, multi-RAT, and multi-layer networks and spectrum handling) that will allow the fulfillment of the requirements of the identified 5G scenarios.

  • 45. Papadimitratos, Panagiotis
    et al.
    Buttyan, L.
    Holczer, T.
    Schoch, E.
    Freudiger, J.
    Raya, M.
    Ma, Z.
    Kargl, F.
    Kung, A.
    Hubaux, J. -P
    Secure Vehicular Communication Systems: Design and Architecture2008In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 46, 100-109 p.Article in journal (Refereed)
  • 46. Papadimitratos, Panagiotis
    et al.
    Fortelle, A. La
    Evenssen, K.
    Brignolo, R.
    Cosenza, S.
    Vehicular Communication Systems: Enabling Technologies, Applications, and Future Outlook on Intelligent Transportation2009In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 47, no 11, 84-95 p.Article in journal (Refereed)
  • 47. Papadimitratos, Panagiotis
    et al.
    Haas, Z. J.
    Securing the Internet Routing Infrastructure2002In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 40, no 10, 60-68 p.Article in journal (Refereed)
    Abstract [en]

    The unprecedented growth of the Internet over the last years, and the expectation of an even faster increase in the numbers of users and networked systems, resulted in the Internet assuming its position as a mass communication medium. At the same time, the emergence of an increasingly large number of application areas and the evolution of the networking technology suggest that in the near future the Internet may become the single integrated communication infrastructure. However, as the dependence on the networking infrastructure grows, its security becomes a major concern, in light of the increased attempt to compromise the infrastructure. In particular, the routing operation is a highly visible target that must be shielded against a wide range of attacks. The injection of false routing information can easily degrade network performance, or even cause denial of service for a large number of hosts and networks over a long period of time. Different approaches have been proposed to secure the routing protocols, with a variety of countermeasures, which, nonetheless, have not eradicated the vulnerability of the routing infrastructure. In this article, we survey the up-to-date secure routing schemes that appeared over the last few years. Our critical point of view and thorough review of the literature are an attempt to identify directions for future research on an indeed difficult and still largely open problem.

  • 48. Papadimitratos, Panagiotis
    et al.
    Poturalski, M.
    Schaller, P.
    Lafourcade, P.
    Basin, D.
    \vCapkun, S.
    Hubaux, J. -P
    Secure Neighborhood Discovery: A Fundamental Element for Mobile Ad Hoc Networking2008In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 46, no 2, 132-139 p.Article in journal (Refereed)
  • 49. Papadimitratos, Panagiotis
    et al.
    Sankaranarayanan, S.
    Mishra, A.
    A Bandwidth Sharing Approach to Improve Licensed Spectrum Utilization2005In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 43, no 12Article in journal (Refereed)
  • 50.
    Parkvall, Stefan
    et al.
    Ericsson Research.
    Furuskär, Anders
    Ericsson Research.
    Dahlman, Erik
    Ericsson Research.
    Evolution of LTE toward IMT-Advanced2011In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 49, no 2, 84-91 p.Article in journal (Refereed)
    Abstract [en]

    This article provides a high-level overview of LTE Release 10, sometimes referred to as LTE-Advanced. First, a brief overview of the first release of LTE and some of its technology components is given, followed by a discussion on the IMT-Advanced requirements. The technology enhancements introduced to LTE in Release 10, carrier aggregation, improved multi-antenna support, relaying, and improved support for heterogeneous deployments, are described. The article is concluded with simulation results, showing that LTE Release 10 fulfills and even surpasses the requirements for IMT-Advanced.

12 1 - 50 of 76
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