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  • 51. Papadimitratos, Panagiotis
    et al.
    Fortelle, A. La
    Evenssen, K.
    Brignolo, R.
    Cosenza, S.
    Vehicular Communication Systems: Enabling Technologies, Applications, and Future Outlook on Intelligent Transportation2009Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 47, nr 11, s. 84-95Artikkel i tidsskrift (Fagfellevurdert)
  • 52. Papadimitratos, Panagiotis
    et al.
    Haas, Z. J.
    Securing the Internet Routing Infrastructure2002Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 40, nr 10, s. 60-68Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 53. Papadimitratos, Panagiotis
    et al.
    Poturalski, M.
    Schaller, P.
    Lafourcade, P.
    Basin, D.
    Čapkun, S.
    Hubaux, J. -P
    Secure Neighborhood Discovery: A Fundamental Element for Mobile Ad Hoc Networking2008Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 46, nr 2, s. 132-139Artikkel i tidsskrift (Fagfellevurdert)
  • 54. Papadimitratos, Panagiotis
    et al.
    Sankaranarayanan, S.
    Mishra, A.
    A Bandwidth Sharing Approach to Improve Licensed Spectrum Utilization2005Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 43, nr 12Artikkel i tidsskrift (Fagfellevurdert)
  • 55.
    Parkvall, Stefan
    et al.
    Ericsson Research.
    Furuskär, Anders
    Ericsson Research.
    Dahlman, Erik
    Ericsson Research.
    Evolution of LTE toward IMT-Advanced2011Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 49, nr 2, s. 84-91Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 56.
    Petrov, Vitaly
    et al.
    Tampere Univ Technol, Lab Elect & Commun Engn, Tampere, Finland..
    Mikhaylov, Konstantin
    Univ Oulu, Ctr Wireless Commun, Oulu, Finland..
    Moltchanov, Dmitri
    Tampere Univ Technol, Tampere, Finland..
    Andreev, Sergey
    Tampere Univ Technol, Lab Elect & Commun Engn, Tampere, Finland..
    Fodor, Gabor
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Reglerteknik.
    Torsner, Johan
    Ericsson Res, Stockholm, Sweden..
    Yanikomeroglu, Halim
    Carleton Univ, Dept Syst & Comp Engn, Ottawa, ON, Canada..
    Juntti, Markku
    Univ Oulu, Telecommun, Oulu, Finland..
    Koucheryavy, Yevgeni
    Tampere Univ Technol, Lab Elect & Commun Engn, Tampere, Finland.;Natl Res Inst, Higher Sch Econ, Moscow, Russia..
    When IoT Keeps People in the Loop: A Path Towards a New Global Utility2019Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 57, nr 1, s. 114-121Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    While the IoT has made significant progress supporting individual machine-type applications, it is only recently that the importance of people as an integral component of the overall IoT infrastructure has started to be fully recognized. Several powerful concepts have emerged to facilitate this vision, whether involving the human context whenever required or directly impacting user behavior and decisions. As these become the stepping stones to develop the IoT into a novel people-centric utility, this article outlines a path to realize this decisive transformation. We begin by reviewing the latest progress in human-aware wireless networking, then classify the attractive human-machine applications and summarize the enabling IoT radio technologies. We continue with a unique system-level performance characterization of a representative urban IoT scenario and quantify the benefits of keeping people in the loop on various levels. Our comprehensive numerical results confirm the significant gains that have been made available with tighter user involvement, and also corroborate the development of efficient incentivization mechanisms, thereby opening the door to future commoditization of the global people-centric IoT utility.

  • 57. Pras, A.
    et al.
    Schönwälder, J.
    Burgess, M.
    Festor, O.
    Martínez Pérez, G.
    Stadler, Rolf
    KTH, Skolan för elektro- och systemteknik (EES), Kommunikationsnät.
    Stiller, B.
    Key research challenges in network management2007Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 45, nr 10, s. 104-110Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Although network management has always played a key role for industry, it only recently received a similar level of attention from many research communities, accelerated by funding opportunities from new initiatives, including the FP7 Program in Europe and GENI/FIND in the United States. Work is ongoing to assess the state of the art and identify the challenges for future research in the field, and this article contributes to this discussion. It presents major findings from a two-day workshop organized jointly by the IRTF/NMRG and the EMANICS Network of Excellence, at which researchers, operators, vendors, and technology developers discussed the research directions to be pursued over the next five years. The workshop identified several topic areas, including management architectures, distributed real-time monitoring, data analysis and visualization, ontologies, economic aspects of management, uncertainty and probabilistic approaches, as well as understanding the behavior of managed systems.

  • 58.
    Quevedo-Teruel, Oscar
    et al.
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknisk teori och konstruktion.
    Ebrahimpouri, Mahsa
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknisk teori och konstruktion.
    Ghasemifard, Fatemeh
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknisk teori och konstruktion.
    Lens Antennas for 5G Communications Systems2018Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 56, nr 7, s. 36-41Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Here, we explain the principles of operating lens antennas, and discuss their potential application for future 5G communications systems. We discuss the connection between the nomenclature employed in the optics and microwave communities, such as the direct relationship between aberrations and directivity and side lobe levels. Furthermore, we explain the potential of two innovative techniques: transformation optics and metasurfaces. Transformation optics, and specifically the concept of bespoke lenses, can be employed to make lenses ad hoc for specific feedings. Metasurfaces can be employed to produce two-dimensional low-cost lenses that can be fully metallic, which is an advantage in terms of losses. Finally, we introduce the concept of higher symmetries that can be used to increase the bandwidth of operation of these metasurfaces lenses.

  • 59. Rimal, B. P.
    et al.
    Van, Dung Pham
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Maier, M.
    Mobile Edge Computing Empowered Fiber-Wireless Access Networks in the 5G Era2017Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, nr 2, s. 192-200, artikkel-id 7842434Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The expected stringent requirements of future 5G networks such as ultra-low latency, user experience continuity, and high reliability will drive the need for highly localized services within RANs in close proximity to mobile subscribers. In light of this, the mobile edge computing (MEC) concept has emerged, which aims to unite telco, IT, and cloud computing to deliver cloud services directly from the network edge. To facilitate better understanding of MEC, this article first discusses its potential service scenarios and identifies design challenges of MEC-enabled networks. Given the importance of scaling up research in the area of network integration and convergence in support of MEC toward 5G, the article explores the possibilities of empowering integrated fiber-wireless (FiWi) access networks to offer MEC capabilities. More specifically, envisioned design scenarios of MEC over FiWi networks for typical RAN technologies (i.e., WLAN, 4G LTE, LTE-A HetNets) are investigated, accounting for both network architecture and enhanced resource management. The performance of MEC over Ethernet-based FiWi networks in terms of delay, response time efficiency, and battery life of edge devices is then analyzed. The obtained results demonstrate the feasibility and effectiveness of the proposed MEC over FiWi concept.

  • 60. Rostami, Ahmad
    et al.
    Ohlen, Peter
    Wang, Kun
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Ghebretensae, Zere
    Skubic, Bjorn
    Santos, Mateus
    Vidal, Allan
    Orchestration of RAN and Transport Networks for 5G: An SDN Approach2017Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, nr 4, s. 64-70Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The fifth generation of mobile networks is planned to be commercially available in a few years. The scope of 5G goes beyond introducing new radio interfaces, and will include new services like low-latency industrial applications, as well as new deployment models such as cooperative cells and densification through small cells. An efficient realization of these new features greatly benefit from tight coordination among radio and transport network resources, something that is missing in current networks. In this article, we first present an overview of the benefits and technical requirements of resource coordination across radio and transport networks in the context of 5G. Then, we discuss how SDN principles can bring programmability to both the transport and radio domains, which in turn enables the design of a hierarchical, modular, and programmable control and orchestration plane across the domains. Finally, we introduce two use cases of SDN-based transport and RAN orchestration, and present an experimental implementation of them in a testbed in our lab, which confirms the feasibility and benefits of the proposed orchestration.

  • 61. Ruffini, M.
    et al.
    Wosinska, Lena
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Achouche, M.
    Chen, Jiajia
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Doran, N.
    Farjady, F.
    Montalvo, J.
    Ossieur, P.
    O’Sullivan, B.
    Parsons, N.
    Pfeiffer, T.
    Qiu, Xing-Zhi
    Raack, C.
    Rohde, H.
    Schiano, M.
    Townsend, P.
    Wessaly, R.
    Yin, Xin
    Payne, D. B.
    DISCUS: An End-to-End Solution for Ubiquitous Broadband Optical Access2014Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 52, nr 2, s. S24-S32Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Fiber to the premises has promised to increase the capacity in telecommunications access networks for well over 30 years. While it is widely recognized that optical-fiber-based access networks will be a necessity in the shortto medium-term future, its large upfront cost and regulatory issues are pushing many operators to further postpone its deployment, while installing intermediate unambitious solutions such as fiber to the cabinet. Such high investment cost of both network access and core capacity upgrade often derives from poor planning strategies that do not consider the necessity to adequately modify the network architecture to fully exploit the cost benefit that a fiber-centric solution can bring. DISCUS is a European Framework 7 Integrated Project that, building on optical-centric solutions such as long-reach passive optical access and flat optical core, aims to deliver a cost-effective architecture for ubiquitous broadband services. DISCUS analyzes, designs, and demonstrates end-to-end architectures and technologies capable of saving cost and energy by reducing the number of electronic terminations in the network and sharing the deployment costs among a larger number of users compared to current fiber access systems. This article describes the network architecture and the supporting technologies behind DISCUS, giving an overview of the concepts and methodologies that will be used to deliver our end-to-end network solution.

  • 62. Shariatmadari, Hamidreza
    et al.
    Ratasuk, Rapeepat
    Iraji, Sassan
    Laya, Andres
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Taleb, Tarik
    Jaentti, Riku
    Ghosh, Amitava
    Machine-type communications: current status and future perspectives toward 5G systems2015Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 53, s. 10-17Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Machine-type communications (MTC) enables a broad range of applications from mission-critical services to massive deployment of autonomous devices. To spread these applications widely, cellular systems are considered as a potential candidate to provide connectivity for MTC devices. The ubiquitous deployment of these systems reduces network installation cost and provides mobility support. However, based on the service functions, there are key challenges that currently hinder the broad use of cellular systems for MTC. This article provides a clear mapping between the main MTC service requirements and their associated challenges. The goal is to develop a comprehensive understanding of these challenges and the potential solutions. This study presents, in part, a roadmap from the current cellular technologies toward fully MTC-capable 5G mobile systems.

  • 63.
    Shokri-Ghadikolaei, Hossein
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik.
    Glaropoulos, Ioannis
    KTH, Skolan för elektro- och systemteknik (EES), Kommunikationsnät.
    Fodor, Viktoria
    KTH, Skolan för elektro- och systemteknik (EES), Kommunikationsnät.
    Fischione, Carlo
    KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik.
    Dimou, Konstantinos
    Ericsson Research.
    Energy efficient spectrum sensing and handoff strategies in cognitive radio networks2013Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The limited spectrum resources and dramatic growth of high data rate communications have motivated opportunistic spectrum access using the promising concept of cognitive radio networks. Although this concept has emerged primarily to enhance spectrum utilization, the importance of energy consumption poses new challenges, because energy efficiency and communication performance can be at odds. In this paper, the existing approaches to energy efficiency spectrum sensing and handoff are classified. The tradeoff between energy consumption and throughput is established as function of the numerous design parameters of cognitive radio networks, both in the case of local and of cooperative spectrum sensing. It is argued that a number of important aspects still needs to be researched, such as fairness, dynamic behavior, reactive and proactive schemes for energy efficiency.

  • 64.
    Shokri-Ghadikolaei, Hossein
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik. KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre.
    Glaropoulos,, Ioannis
    Fodor, Viktoria
    KTH, Skolan för elektro- och systemteknik (EES), Kommunikationsnät.
    Fischione, Carlo
    KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik.
    Ephremides, Antony
    Green Sensing and Access: Energy-Throughput Trade-offs in Cognitive Networking2015Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 53, nr 11, s. 199-207Artikkel, omtale (Fagfellevurdert)
    Abstract [en]

    Limited spectrum resources and the dramatic growth of high data rate applications have motivated opportunistic spectrum access exploiting the promising concept of cognitive networks. Although this concept has emerged primarily to enhance spectrum utilization and to allow the coexistence of heterogeneous network technologies, the importance of energy consumption imposes additional challenges, because energy consumption and communication performance can be at odds. In this article the approaches for energy efficient spectrum sensing and spectrum handoff, fundamental building blocks of cognitive networks, are investigated. The trade-offs between energy consumption and throughput, under local as well as under cooperative sensing, are characterized. We also discuss the additional factors that need to be investigated to achieve energy efficient cognitive operation under various application requirements.

  • 65. Skorin-Kapov, Nina
    et al.
    Furdek, Marija
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Zsigmond, Szilard
    Wosinska, Lena
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Physical-Layer Security in Evolving Optical Networks2016Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 54, nr 8, s. 110-117Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We are witnessing the evolution of optical networks toward highly heterogeneous, flexible networks with a widening area of application. As the bandwidth and reliability performance requirements of mission-critical applications tighten, and the amount of carried data grows, issues related to optical network security are becoming increasingly important. Optical networks are vulnerable to several types of attacks at the physical layer, typically aimed at disrupting the service or gaining unauthorized access to carried data. Such security breaches can induce financial losses to clients or loss of privacy, or cause network-wide service disruption, possibly leading to huge data and revenue losses. Awareness of system weaknesses and possible attack methods is a prerequisite for designing effective network security solutions. As optical networks evolve, new and changing vulnerabilities must be identified and dealt with efficiently. To this end, this article provides a comprehensive overview of potential physical-layer attack scenarios in current and future optical networks. It then proposes a general security framework, outlining possible strategies for dealing with such attacks, meant to aid in the development of efficient provisioning, monitoring, protection, and restoration schemes in the context of optical-layer security.

  • 66. Skubic, Björn
    et al.
    Chen, Jiajia
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.
    Ahmed, Jawwad
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.
    Chen, Biao
    Wosinska, Lena
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.
    Mukherjee, Biswanath
    Dynamic Bandwidth Allocation for Long-Reach PON: Overcoming Performance Degradation2010Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 48, nr 11, s. 100-108Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A passive optical network, with its inherent point to multi-point structure, allows for centralized placement of active equipment and possible extension of its boundary towards core networks. This property of the PON can be exploited for node consolidation where multiple central offices are replaced by a single one covering a larger service area. Such node consolidation is being particularly driven by the need for network operational cost saving, and is offering significant challenges to PONs. The degree of node consolidation that can be achieved is limited by the reach of conventional PON systems. In order to achieve a larger degree of node consolidation, an extension of the PON reach, beyond the conventional 20 km, is required. This article addresses the challenges of the dynamic bandwidth allocation, where increased reach results in a degradation of DBA performance and quality of service support. This degradation is a consequence of the increased propagation delay of the DBA messages exchanged between different PON elements. A potential solution to the performance degradation is the introduction of a multi-threaded DBA. In this article, we examine for both Gigabit PON and Ethernet PON, the extent to which DBA performance degradation can be reduced by exploiting multi-threading. It is found that for both standards, multi-threading, if done properly, can be used to mitigate the performance degradation due to the increased reach. To make bandwidth allocation efficient, new schemes for coordinating the multiple threads are required in long reach PON.

  • 67. Skubic, Björn
    et al.
    Chen, Jiajia
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Ahmed, Jawwad
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Wosinska, Lena
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Mukherjee, Biswanath
    A Comparison of Dynamic Bandwidth Allocation for EPON, GPON, and Next-Generation TDM PON2009Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 47, nr 3, s. S40-S48Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Dynamic bandwidth allocation in passive optical networks presents a key issue for providing efficient and fair utilization of the PON upstream bandwidth while supporting the QoS requirements of different traffic classes. In this article we compare the typical characteristics of DBA, such as bandwidth utilization, delay, and jitter at different traffic loads, within the two major standards for PONs, Ethernet PON and gigabit PON. A particular PON standard sets the framework for the operation of DBA and the limitations it faces. We illustrate these differences between EPON and GPON by means of simulations for the two standards. Moreover, we consider the evolution of both standards to their next-generation counterparts with the bit rate of 10 Gb/s and the implications to the DBA. A new simple GPON DBA algorithm is used to illustrate GPON performance. It is shown that the length of the polling cycle plays a crucial but different role for the operation of the DBA within the two standards. Moreover, only minor differences regarding DBA for current and next-generation PONs were found.

  • 68. Stenumgaard, Peter
    et al.
    Chilo, Jose
    Ferrer Coll, Javier
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab). KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.
    Ängskog, Per
    Challenges and conditionsfor wireless machine-to-machine communications in industrial environments2013Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 51, nr 6, s. 187-192Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Wireless solutions are rapidly growing in machine-to-machine communications in industrial environments. These environments provide challenging conditions in terms of radio wave propagation as well as electromagnetic interference. In this article, results from the characterization of radio channel properties are summarized in order to provide some guidelines for the choice of wireless solutions in industrial environments. In conclusion, it is essential to know the sensitivity of industrial processes to time delay in data transfer. Furthermore, it is important to be aware of the radio interference environment and the manner in which different wireless technologies react upon interference. These steps will minimize the risk of unforeseen expensive disturbances in industrial processes.

     

  • 69.
    Szegedi, Peter
    et al.
    Trans-European Research and Education Networking Association.
    Riera, Jordi Ferrer
    Fundació i2CAT.
    Garcia-Espin, Joan Antoni
    Fundació i2CAT.
    Hidell, Markus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    Sjödin, Peter
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    Söderman, Pehr
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    Ruffini, Marco
    Trinity College Dublin.
    O’Mahony, Donal
    Trinity College Dublin.
    Bianco, Andrea
    Politecnico di Torino.
    Giraudo, Luca
    Politecnico di Torino.
    Ponce de Leon, Miguel
    Waterford Institute of Technology.
    Power, Gemma
    Waterford Institute of Technology.
    Cervelló-Pastor, Cristina
    Universitat Politècnica de Catalunya.
    López, Víctor
    Universidad Autónoma de Madrid.
    Naegele-Jackson, Susanne
    Friedrich-Alexander University of Erlangen-Nuremberg.
    Enabling future internet research: the FEDERICA case2011Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 49, nr 7, s. 54-61Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Internet, undoubtedly, is the most influential technical invention of the 20th century that affects and constantly changes all aspects of our day-to-day lives nowadays. Although it is hard to predict its long-term consequences, the potential future of the Internet definitely relies on future Internet research. Prior to every development and deployment project, an extensive and comprehensive research study must be performed in order to design, model, analyze, and evaluate all impacts of the new initiative on the existing environment. Taking the ever-growing size of the Internet and the increasing complexity of novel Internet-based applications and services into account, the evaluation and validation of new ideas cannot be effectively carried out over local test beds and small experimental networks. The gap which exists between the small-scale pilots in academic and research test beds and the realize validations and actual deployments in production networks can be bridged by using virtual infrastructures. FEDERICA is one of the facilities, based on virtualization capabilities in both network and computing resources, which creates custom-made virtual environments and makes them available for Future Internet Researchers. This article provides a comprehensive overview of the state-of-the-art research projects that have been using the virtual infrastructure slices of FEDERICA in order to validate their research concepts, even when they are disruptive to the test bed’s infrastructure, to obtain results in realistic network environments.

  • 70.
    Tolli, Antti
    et al.
    Univ Oulu, Ctr Wireless Commun, Oulu, Finland..
    Ghauch, Hadi
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Nätverk och systemteknik.
    Kaleva, Jarkko
    Univ Oulu, Ctr Wireless Commun, Oulu, Finland..
    Komulainen, Petri
    Mediatek Wireless, Oulu, Finland..
    Bengtsson, Mats
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Teknisk informationsvetenskap.
    Skoglund, Mikael
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Teknisk informationsvetenskap.
    Honig, Michael
    Northwestern Univ, EECS Dept, Evanston, IL 60208 USA..
    Lahetkangas, Eeva
    Nokia Bell Labs, Murray Hill, NJ USA..
    Tiirola, Esa
    Nokia Bell Labs, Murray Hill, NJ USA..
    Pajukoski, Kari
    Nokia Bell Labs, Murray Hill, NJ USA..
    Distributed Coordinated Transmission with Forward-Backward Training for 5G Radio Access2019Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 57, nr 1, s. 58-64Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    CoMP transmission and reception have been considered in cellular networks for enabling larger coverage, improved rates, and interference mitigation. To harness the gains of coordinated beamforming, fast information exchange over a backhaul connecting the cooperating BSs is required. In practice, the bandwidth and delay limitations of the backhaul may not be able to meet such stringent demands. These impairments motivate the study of cooperative approaches based only on local CSI that require minimal or no information exchange between the BSs. To this end, several distributed approaches are introduced for CB-CoMP. The proposed methods rely on the channel reciprocity and iterative spatially precoded over-the-air pilot signaling. We elaborate how F-B training facilitates distributed CB by allowing BSs and UEs to iteratively optimize their respective transmitters/receivers based on only locally measured CSI. The trade-off due to the overhead from the F-B iterations is discussed. We also consider the challenge of dynamic TDD where the UE-UE channel knowledge cannot be acquired at the BSs by exploiting channel reciprocity. Finally, standardization activities and practical requirements for enabling the proposed F-B training schemes in 5G radio access are discussed.

  • 71.
    Trifunovic, Sacha
    et al.
    ETH Zurich.
    Kouyoumdjieva, Sylvia T.
    KTH, Skolan för elektro- och systemteknik (EES), Nätverk och systemteknik. KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre.
    Distl, Bernhard
    ETH Zurich.
    Pajevic, Ljubica
    KTH, Skolan för elektro- och systemteknik (EES), Nätverk och systemteknik. KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre.
    Karlsson, Gunnar
    KTH, Skolan för elektro- och systemteknik (EES), Nätverk och systemteknik. KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre.
    Plattner, Bernhard
    ETH Zurich.
    A Decade of Research in Opportunistic Networks: Challenges, Relevance, and Future Directions2017Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, nr 1, s. 168-173, artikkel-id 7823357Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Opportunistic networks are envisioned to complement traditional infrastructure-based communication by allowing mobile devices to communicate directly with each other when in communication range instead of via the cellular network. Due to their design, opportunistic networks are considered to be an appropriate communication means in both urban scenarios where the cellular network is overloaded, as well as in scenarios where infrastructure is not available, such as in sparsely populated areas and during disasters. However, after a decade of research, opportunistic networks have not yet been ubiquitously deployed. In this article we explore the reasons for their absence. We take a step back, and first question whether the use cases that are traditionally conjured to motivate opportunistic networking research are still relevant. We also discuss emerging applications that leverage the presence of opportunistic connectivity. Further, we look at past and current technical issues, and we investigate how upcoming technologies would influence the opportunistic networking paradigm. Finally, we outline some future directions for researchers in the field of opportunistic networking.

  • 72.
    Van, Dung Pham
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Rimal, Bhaskar Prasad
    Chen, Jiajia
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Monti, Paolo
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Wosinska, Lena
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Maier, Martin
    Power-Saving Methods for Internet of Things over Converged Fiber-Wireless Access Networks2016Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 54, nr 11, s. 166-175Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The IoT has been emerging as the next big leap in the information and communication technology sector. Providing a unified communication platform to support billions of smart connected devices seamlessly alongside existing voice and Internet services is vitally challenging. This article leverages converged fiber-wireless (FiWi) access networks to design a shared communication infrastructure for supporting both IoT applications and traditional services. Given the paramount importance of energy efficiency in both IoT and access networks, the article discusses the possibilities and potential challenges of designing and implementing power-saving mechanisms to prolong battery life of IoT devices while reducing energy consumption of the optical backhaul network. In-depth technical guidelines are provided through end-to-end power-saving solutions proposed for typical IoT deployment scenarios.

  • 73. Vassilaras, S.
    et al.
    Gkatzikis, Lazaros
    KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik. University of Thessaly, Greece.
    Liakopoulos, N.
    Stiakogiannakis, I. N.
    Qi, M.
    Shi, L.
    Liu, L.
    Debbah, M.
    Paschos, G. S.
    The Algorithmic Aspects of Network Slicing2017Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, nr 8, s. 112-119, artikkel-id 8004165Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Network slicing is a technique for flexible resource provisioning in future wireless networks. With the powerful SDN and NFV technologies available, network slices can be quickly deployed and centrally managed, leading to simplified management, better resource utilization, and cost efficiency by commoditization of resources. Departing from the one-Type-fits-All design philosophy, future wireless networks will employ the network slicing methodology in order to accommodate applications with widely diverse requirements over the same physical network. On the other hand, deciding how to efficiently allocate, manage, and control the slice resources in real time is very challenging. This article focuses on the algorithmic challenges that emerge in efficient network slicing, necessitating novel techniques from the communities of operation research, networking, and computer science.

  • 74.
    Vondra, Michal
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Dinc, Ergin
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Prytz, Mikael
    Frodigh, Magnus
    Dominic, Schupke
    Nilsson, Mats
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Hofmann, Sandra
    Cavdar, Cicek
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Performance Study on Seamless DA2GC for Aircraft Passengers Toward 5G2017Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, nr 11, s. 194-201Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Mobile users seek for ubiquitous broadband connectivity even during a flight above the clouds. As many passengers are expected to be connected to high-speed Internet, robust and high-capacity direct air-to-ground communication (DA2GC) to connect the aircraft with the ground cellular network is particularly attractive. In this paper, we assess the capacity limitations of DA2GC link provided to an aircraft by employing currently available 4G radio technologies. Further, we study different capacity enhancement techniques toward 5G such as an implementation of Multi-User Multiple Input Multiple Output (MU-MIMO) or coordinated beamsteering to improve DA2GC capacity. We also compare DA2GC performance with connectivity offered by satellites. According to our results, DA2GC network extended for techniques toward 5G can improve capacity available per aircraft nearly by 100 Mb/s in comparison with the 4G DA2GC network, assuming 20 MHz bandwidth is exploited. Although the maximal capacity provided by the 5G DA2GC network and satellite communication is the same, satellite communication exhibits only 40 Mb/s for 10 000 deployed satellites in average. To incite future investigation in this field, this paper also outlines open challenges and research directions toward more efficient DA2GC. 

  • 75.
    Wang, Kun
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab). RISE Acreo.
    Gavler, Anders
    RISE Acreo.
    Mas Machuca, Carmen
    Technical University of Munich.
    Wosinska, Lena
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Brunnström, Kjell
    RISE Acreo.
    Chen, Jiajia
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Migration Strategies for FTTx Solutions based on Active Optical Networks2016Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 54, nr 2, s. 78-85Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    AON, one of the most deployed fiber access solutions in Europe, needs to be upgraded in order to satisfy the ever growing bandwidth demand driven by new applications and services. Meanwhile, network providers want to reduce both capital expenditures and operational expenditures to ensure that there is profit coming from their investments. This article proposes several migration strategies for AON from the data plane, topology, and control plane perspectives, and investigates their impact on the total cost of ownership.

  • 76. Wang, X.
    et al.
    Cavdar, Cicek
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Wang, L.
    Tornatore, M.
    Chung, H. S.
    Lee, H. H.
    Park, S. M.
    Mukherjee, B.
    Virtualized Cloud Radio Access Network for 5G Transport2017Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, nr 9, s. 202-209, artikkel-id 8030505Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Current radio access networks (RANs) need to evolve to handle diverse service requirements coming from the growing number of connected devices and increasing data rates for the upcoming 5G era. Incremental improvements on traditional distributed RANs cannot satisfy these requirements, so the novel and disruptive concept of a cloud RAN (CRAN) has been proposed to decouple digital units (DUs) and radio units (RUs) of base stations (BSs), and centralize DUs into a central office, where virtualization and cloud computing technologies are leveraged to move DUs into the cloud. However, separating RUs and DUs requires low-latency and high-bandwidth connectivity links, called "fronthaul," as opposed to traditional backhaul links. Hence, design of the 5G transport network, that is, the part of the network that carries mobile data traffic between BSs and the core network and data centers, is key to meet the new 5G mobile service requirements and effectively transport the fronthaul traffic. Today, consensus is yet to be achieved on how the fronthaul traffic will be transported between RUs and DUs, and how virtualization of network resources will occur from a radio network segment to the centralized baseband processing units. In this article, we present a new 5G architecture, called virtualized cloud radio access network (V-CRAN), moving toward a cell-less 5G network architecture. We leverage the concept of a virtualized BS (V-BS) that can be optimally formed by exploiting several enabling technologies such as software defined radio (SDR) and coordinated multipoint (CoMP) transmission/reception. A V-BS can be formed on a per-cell basis or per-user basis by allocating virtualized resources on demand. For the fronthaul solution, our approach exploits the passive optical network (PON), where a wavelength can be dynamically assigned and shared to form a virtualized passive optical network (VPON). Several use cases of the V-CRAN are presented to show how network architecture evolution can enhance system throughput, energy efficiency, and mobility management.

  • 77.
    Wiatr, Pawel
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101). KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101), Fotonik (Stängd 20120101). KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik (Stängd 20120101). KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Power Savings versus Network Performance in Dynamically Provisioned WDM Networks2012Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 50, nr 5, s. 48-55Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The role of the ICT sector in our daily life is causing a significant growth of the power consumed by the network equipment. In this context, transparent WDM networks represent a promising solution for reducing the power consumption of telecom networks. For this reason transparent WDM networks attract a lot of interest and several power-aware routing and wavelength assignment algorithms are available in the literature. These approaches, however, seem to consider power minimization as the only parameter to be optimized. Little or no attention is given to other important network aspects, e. g., connection requests blocking. Such approaches may not always be advisable, especially in core WDM networks where high performance levels must be considered in the first place. This article aims at providing a different insight to the PA-routing problem. It follows the intuition that in some cases relaxing the power minimization constraint can have beneficial effects on the overall network performance, especially on the blocking probability. A novel approach, referred to as Weighted Power-Aware Lightpath Routing (WPA-LR), is proposed and evaluated using two continental core networks. Our results confirm the presence of a trade-off between power savings and blocking probability.

  • 78. Wu, Jinsong
    et al.
    Bisio, Igor
    Gniady, Chris
    Hossain, Ekram
    Valla, Massimo
    Li, Haibo
    KTH, Skolan för datavetenskap och kommunikation (CSC), Medieteknik och interaktionsdesign, MID.
    Context-aware networking and communications: Part 12014Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 52, nr 6, s. 14-15Artikkel i tidsskrift (Fagfellevurdert)
  • 79. Wu, Jinsong
    et al.
    Bisio, Igor
    Gniady, Chris
    Hossain, Ekram
    Valla, Massimo
    Li, Haibo
    KTH, Skolan för datavetenskap och kommunikation (CSC), Medieteknik och interaktionsdesign, MID.
    Context-aware networking and communications: Part 22014Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 52, nr 8, s. 64-65Artikkel i tidsskrift (Fagfellevurdert)
  • 80.
    Wuhib, Fetahi
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Kommunikationsnät.
    Stadler, Rolf
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Clemm, Alexander
    Decentralized service-level monitoring using network threshold crossing alerts2006Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 44, nr 10, s. 70-76Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Service level agreements are at the core of the business relationship between service providers and their customers. Service level monitoring is necessary to validate and ensure that service levels are indeed adhered to. One key tool for this is threshold crossing alerts. TCAs can notify a service provider that a certain parameter has exceeded a certain threshold value, directing attention to those areas where preventive action needs to be taken. This article presents a protocol and an architecture that implements a new category of TCAs for parameters that need to be aggregated across a network, as opposed to parameters that can be observed from a single device; for example, "average utilization across all links in a network" as opposed to "utilization of a particular link." Although highly useful, such parameters are rarely subjected to SLAs today, due to the lack of effective monitoring technology. Our system fills this gap. It does so in a manner that is decentralized inside the network and does not rely on a more traditional centralized management architecture. We focus on business application aspects, as well as the robustness and accuracy properties of our system.

  • 81.
    Yang, Guang
    et al.
    KTH.
    Xiao, Ming
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Teknisk informationsvetenskap.
    Alam, M.
    Huang, Y.
    Low-Latency Heterogeneous Networks with Millimeter-Wave Communications2018Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 56, nr 6, s. 124-129Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The heterogeneous network (HetNet) is a key enabler to largely boost network coverage and capacity in the forthcoming 5G and beyond. To support the explosively growing mobile data volumes, wireless communications with millimeter- wave (mmWave) radios have attracted massive attention, and is widely considered as a promising candidate in 5G HetNets. In this article, we give an overview on the end-to-end latency of HetNets with mmWave communications. In general, it is rather challenging to formulate and optimize the delay problem with buffers in mmWave communications, since conventional graph-based network optimization techniques are not applicable when queues are considered. Toward this end, we develop an adaptive low-latency strategy, which uses cooperative networking to reduce the end-to-end latency. Then we evaluate the performance of the introduced strategy. Results reveal the importance of proper cooperative networking in reducing the end-toend latency. In addition, we have identified several challenges in future research for low-latency mmWave HetNets.

  • 82. Ye, Yabin
    et al.
    Jimenez Arribas, Felipe
    Elmirghani, Jaafar
    Idzikowski, Filip
    Lopez Vizcaino, Jorge
    Monti, Paolo
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Musumeci, Francesco
    Pattavina, Achille
    Van Heddeghem, Ward
    Energy-Efficient Resilient Optical Networks: Challenges and Trade-offs2015Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 53, nr 2, s. 144-150Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Energy efficiency and resilience are two well established research topics in optical transport networks. However, their overall objectives (i.e., power minimization and resource utilization/availability maximization) conflict. In fact, provisioning schemes optimized for best resilience performance are in most cases not energy-efficient in their operations, and vice versa. However, very few works in the literature consider the interesting issues that may arise when energy efficiency and resilience are combined in the same networking solution. The objective of this article is to identify a number of research challenges and trade-offs for the design of energy-efficient and resilient optical transport networks from the perspective of long-term traffic forecasts, short-term traffic dynamics, and service level agreement requirements. We support the challenges with justifying numbers based on lessons learned from our previous work. The article also discusses suitable metrics for energy efficiency and resilience evaluation, in addition to a number of steps that need to be taken at the standardization level to incorporate energy efficiency into already existing and well established protocols.

  • 83. Yetis, Cenk M.
    et al.
    Fanjul, Jacobo
    Garcia-Naya, Jose A.
    Moghadam, Nima N.
    KTH, Skolan för elektro- och systemteknik (EES), Teknisk informationsvetenskap.
    Farhadi, Hamed
    Interference Alignment Testbeds2017Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 55, nr 10, s. 120-126Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Interference alignment has triggered high impact research in wireless communications since it was proposed nearly 10 years ago. However, the vast majority of research is centered on the theory of interference alignment and is hardly feasible in view of the existing state-of-the-art wireless technologies. Although several research groups have assessed the feasibility of interference alignment via testbed measurements in realistic environments, the experimental evaluation of interference alignment is still in its infancy since most of the experiments were limited to simpler scenarios and configurations. This article summarizes the practical limitations of experimentally evaluating interference alignment, provides an overview of the available interference alignment testbed implementations, including the costs, and highlights the imperatives for succeeding interference alignment testbed implementations. Finally, the article explores future research directions on the applications of interference alignment in the next generation wireless systems.

  • 84.
    Zander, Jens
    KTH, Tidigare Institutioner                               , Signaler, sensorer och system.
    Radio Resource Management in Future Wireless Networks - Requirements and Limitations1997Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 35, nr 8, s. 30-36Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Comparing market estimates for wireless personal communication and considering recent proposals for wideband multimedia services with the existing spectrum allocations for these types of systems show that spectrum resource management remains an important topic in the near and distant future. In this paper, we start out by presenting a quite general formulation of the radio resource management problem where the three key allocation decisions are concerned with waveforms(`channels”), access ports (or base stations) and, finally, with the transmitter powers. We briefly review some the current approaches to these problems as found in the litterature. In particular the principles of random channel allocation schemes, as found in frequency hopping or direct sequence CDMA systems, are compared with determinisic dynamic channel allocation schemes. The paper closes by giving an outlook over some of the key problems in resource management in future wireless multimedia systems.

  • 85.
    Zander, Jens
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.
    Mähönen, Petri
    Riding the Data Tsunami in the Cloud: Myths and Challenges in Future Wireless Access2013Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 51, nr 3, s. 145-151Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Data rates of mobile communications have increased dramatically during the last decade. The industry predicts an exponential increase of data traffic that would correspond to a 1000-fold increase in traffic between 2010 and 2020. These figures are very similar to ones reported during the last Internet boom. In this article we assess the realism of these assumptions. We conjecture that wireless and mobile Internet access will emerge as a dominant technology. A necessary prerequisite for this development is that wireless access is abundant and becomes (almost) free. A consequence is that the projected capacity increase must be provided at the same cost and energy consumption as today. We explore technical and architectural solutions that have realistic possibility to achieve these targets. We ask if Moore's law, which has successfully predicted the tremendous advances in computing and signal processing, will also save the day for high-speed wireless access. We argue that further improvements of the PHY layer are possible, but it is unlikely that this alone provides a viable path. The exponential traffic increase has to be matched mainly by increasing the density of the access networks as well as providing a modest amount of extra spectrum. Thus, the future research challenges are in designing energy-and cost-efficient short-range architectures and systems that support super-dense deployments. A non-technical complication is that such infrastructures are likely to lead to highly fragmented markets with a large number of operators and infrastructure owners.

  • 86.
    Zhang, Charlie Jianzhong
    et al.
    Univ Wisconsin, Madison, WI 53706 USA..
    Ma, Jianglei
    Huawei Canada R Ctr, Markham, ON, Canada..
    Li, Geoffrey Ye
    Georgia Tech, Atlanta, GA 30332 USA..
    Kishiyama, Yoshihisa
    Hokkaido Univ, Sapporo, Hokkaido, Japan..
    Parkvall, Stefan
    KTH. Ericsson Res, Kista, Sweden.
    Liu, Guangyi
    China Mobile Res Inst, Wireless & Device Dept, Beijing, Peoples R China..
    Kim, Young-Han
    Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA..
    Key Technology for 5G New Radio2018Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 56, nr 3, s. 10-11Artikkel i tidsskrift (Fagfellevurdert)
  • 87. Zhang, Charlie Jianzhong
    et al.
    Ma, Jianglei
    Li, Geoffrey Ye
    Georgia Tech, Sch ECE, Atlanta, GA USA..
    Yu, Wei
    Univ Toronto, Toronto, ON, Canada..
    Jindal, Nihar
    Univ Calif Berkeley, Elet Engn Comp Sci, Berkeley, CA USA..
    Kishiyama, Yoshihisa
    NTT DoCoMo, INC, Toyota, Japan..
    Parkvall, Stefan
    KTH. Royal Inst Technol, Stockholm, Sweden..
    New Waveforms for 5G Networks2016Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 54, nr 11, s. 64-65Artikkel i tidsskrift (Annet vitenskapelig)
  • 88.
    Zhang, Lu
    et al.
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Udalcovs, Aleksejs
    RISE Res Inst Sweden AB, Gothenburg, Sweden..
    Lin, Rui
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Ozolins, Oskars
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Fotonik.
    Pang, Xiaodan
    Infinera Metro HW R&D, Stockholm, Sweden..
    Gan, Lin
    HUST, Next Generat Internet Access Syst Not Engn Lab, Wuhan, Hubei, Peoples R China..
    Schatz, Richard
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Fotonik.
    Tang, Ming
    Huazhong Univ Sci & Technol, Wuhan, Hubei, Peoples R China..
    Fu, Songnian
    Huazhong Univ Sci & Technol, Wuhan, Hubei, Peoples R China..
    Liu, Deming
    Huazhong Univ Sci & Technol, Wuhan, Hubei, Peoples R China..
    Tong, Weijun
    Yangtze Opt Fibre & Cable Joint Stock Ltd Co, Speical Bussiness Unit, Wuhan, Hubei, Peoples R China..
    Popov, Sergei
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Fotonik.
    Jacobsen, Gunnar
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Fotonik.
    Hu, Weisheng
    Shanghai Jiao Tong Univ, Shanghai, Peoples R China..
    Xiao, Shilin
    Shanghai Jiao Tong Univ, Shanghai, Peoples R China..
    Chen, Jiajia
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Kommunikationssystem, CoS, Optical Network Laboratory (ON Lab).
    Toward Terabit Digital Radio over Fiber Systems: Architecture and Key Technologies2019Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 57, nr 4, s. 131-137Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    To support massive deployment of broadband radio applications, such as 5G and high-definition videos for terrestrial televisions, large system capacity and high spectrum efficiency are highly demanded in radio over fiber (RoF) systems. In this article, we propose a terabit digital RoF system capable of providing high-speed transmission, where multicore fiber (MCF) is introduced for the access segment between the central unit and remote unit. Two key technologies that greatly enhance system capacity and spectrum efficiency, namely MCF enabled self-homodyne detection and compressed quantization, are demonstrated.

  • 89. Zhao, G.
    et al.
    Imran, M. A.
    Pang, Zhibo
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Teknisk informationsvetenskap.
    Chen, Z.
    Li, L.
    Toward Real-Time Control in Future Wireless Networks: Communication-Control Co-Design2019Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 57, nr 2, s. 138-144, artikkel-id 8558500Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Wireless networks are undergoing a transition from connecting people to connecting things, which will allow human interaction with the physical world in a real-time fashion, for example, Tactile Internet, industrial automation, self-driving vehicles, and remote surgery. Therefore, future wireless networks need to support real-time control since it is the essential function enabling such emerging applications. In this article, some fundamental design capabilities needed to realize real-time control in future wireless networks are discussed, with primary emphasis given to communication-control because both communication and control systems have strong dynamics and interdependencies, and they tightly interact with each other. A case study is provided to demonstrate the necessity of such co-design.

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