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  • 1.
    Bohge, Mathias
    et al.
    TU Berlin.
    Gross, James
    Telecommunications Networks Group (TKN), Technical University Berlin.
    Meyer, Michael
    Ericsson Research.
    Wolisz, Adam
    TU Berlin.
    Dynamic Resource Allocation in OFDM Systems: An Overview of Cross-Layer Optimization Principles and Techniques2007In: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 21, no 1, p. 53-59Article in journal (Refereed)
    Abstract [en]

    Recently, a lot of research effort has been spent on cross-layer system design. It has been shown that cross-layer mechanisms (i.e., policies) potentially provide significant performance gains for various systems. In this article we review several aspects of cross-layer system optimization regarding wireless OFDM systems. We discuss basic optimization models and present selected heuristic approaches realizing cross-layer policies by means of dynamic resource allocation. Two specific areas are treated separately: models and dynamic approaches for single transmitter/receiver pairs (i.e., a point-to-point communication scenario) as well as models and approaches for point-to-multipoint communication scenarios (e.g., the downlink of a wireless cell). This article provides basic knowledge in order to investigate future OFDM cross-layer-optimization issues.

  • 2. Csaszar, Andras
    et al.
    Enyedi, Gabor
    Retveri, Gabor
    Hidell, Markus
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Sjödin, Peter
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Converging the evolution of router architectures and IP networks2007In: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 21, no 4, p. 8-14Article in journal (Refereed)
    Abstract [en]

    Although IP is widely recognized as the platform for next-generation converged networks, unfortunately, it is heavily burdened by its heritage of almost 30 years. Nowadays, network operators must devote significant resources to perform essential tasks, such as traffic engineering, policy enforcement, and security. In this article, we argue that one of the principal reasons for this is the way control and forwarding planes are interspersed in IP networks today. We review the architectural. developments that led to the current situation, and we reason that centralization of network control functionality can constitute a solution to the pressing problems of the contemporary Internet.

  • 3.
    Duchamp, Daniel J.
    et al.
    Columbia University.
    Feiner, Steven K.
    Columbia University.
    Maguire Jr., Gerald Q.
    Columbia University, Department of Computer Science.
    Software technology for wireless mobile computing1991In: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 5, no 6, p. 12-18Article in journal (Refereed)
    Abstract [en]

    Some of the possibilities and requirements for mobile computing on wireless local area networks (LANs) are discussed from the systems software viewpoint. The design of the Student Electronic Notebook (SEN) is sketched to provide a partial catalog of problems in building a real system for wireless mobile computing. This project was initiated to investigate the potential of wireless mobile computing to reshape education. Some of the key directions for research in software technology for wireless, mobile computing are examined. Some of the authors' experience with wireless LANs is related.

  • 4. Gomez-Barquero, David
    et al.
    Cardona, Narcis
    Bria, Aurelian
    Zander, Jens
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Affordable mobile TV services in hybrid cellular and DVB-H systems2007In: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 21, no 2, p. 34-40Article in journal (Refereed)
    Abstract [en]

    Mobile TV services are expected to become a key application in future wireless networks. The recently proposed terrestrial digital broadcast technology, DVB-H, especially designed for mobile services, is regarded as a powerful alternative to the 3G cellular networks that already offer these services but on a point-to-point basis. Unfortunately, the cost of supporting real-time streaming and full area coverage seems to be very high compared to fixed TV services. In this article we discuss hybrid IP datacast DVB-H and 3G systems as a possible solution for providing affordable network infrastructure and services. Our approach is DVB-H centric. The 3G cellular system plays the role of providing interactivity, error reporting, and repair for the DVB-H broadcast channel. To enable an easy and efficient interworking of DVB-H and 3G, we employ forward error correction at the application layer with digital fountain coding. The main way to provide, lower cost services is to avoid full DVB-H area coverage from the beginning and to perform an incremental DVB-H network deployment that follows the user demand. In this direction, to hide the discontinuity in coverage from the perception of users, we propose to take advantage of the bursty character of DVB-H transmissions and the mobility of users. This is possible by sending additional parity data, either with the DVB-H or the cellular network, in the time intervals between original service bursts. We evaluate the potential DVB-H infrastructure cost savings determined by transmitting additional parity data in DVB-H when targeting vehicular users. The implications of delivering parity data through the cellular network also are discussed. The numerical investigations show a potential for significant cost savings compared with the traditional approaches.

  • 5.
    Karlsson, Gunnar
    et al.
    KTH, School of Electrical Engineering (EES), Communication Networks.
    Más, Ignacio
    KTH, School of Electrical Engineering (EES), Communication Networks.
    Quality of Service and the End-to-End argument2007In: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 21, no 6, p. 16-21Article in journal (Refereed)
    Abstract [en]

    Audio-visual services are now commonly used on the Internet. Many of them are based on batch downloading of contents for later replay. Real-time interactive and streaming services are now rapidly becoming popular. These services would benefit from quality of service if it were widely provided. The purpose of this article is to show how QoS solutions may be introduced incrementally. Quality is obtained by means of a probe-based admission control that can be exerted outside the network. The introduction of QoS starts from self-admission control in the application layer, followed by transport layer service differentiation. These two steps do not require any change to the network. If motivated, scheduling for service class separation in the network may be added. We show by proof of concept how QoS may be provided in agreement with the end-to-end argument. The three steps of our proposal are compared and discussed with respect to the possibility of deployment.

  • 6.
    Kim, Seong-Lyun
    et al.
    KTH.
    Wu, Dapeng Oliver
    Schilling, Klaus
    Machine and Robotic Networking2012In: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 26, no 3, p. 4-5Article in journal (Other academic)
  • 7. Saha, D.
    et al.
    Mukherjee, Amitava
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT. IBM Global Services, Calcutta, India .
    Misra, I. S.
    Chakraborty, M.
    Mobility support in IP: A survey of related protocols2004In: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 18, no 6, p. 34-40Article in journal (Refereed)
    Abstract [en]

    This article presents an overview of a set of IP-based mobility protocols - Mobile IP, HAWAII, Cellular IP, Hierarchical MIP, TeleMIP, Dynamic Mobility Agent, and Terminal Independent MIP - that will play an important role in the forthcoming convergence of IP and legacy wireless networks. A comparative analysis with respect to system parameters such as location update, handoff latency and signaling overhead exposes their ability in managing micro/macro/global-level mobility. We use this observation to relate their features against a number of key design issues identified for seamless IP-based mobility as envisioned for future 4G networks.

  • 8.
    Shames, Iman
    et al.
    KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Teixeira, André
    KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Sandberg, Henrik
    KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Johansson, Karl Henrik
    KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Agents Misbehaving in a Network: a Vice or a Virtue?2012In: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 26, no 3, p. 35-40Article in journal (Refereed)
    Abstract [en]

    Misbehaviors among the agents in a network might be intentional or unintentional, they might cause a system-wide failure or they might improve the performance or even enable us to achieve an objective. In this article we consider examples of these possible scenarios. First, we argue the necessity of monitoring the agents in a network to detect if they are misbehaving or not and outline a distributed method in which each agent monitors its neighbors for any sign of misbehavior. Later, we focus on solving the problem of distributed leader selection via forcing the agents to temporarily misbehave, and introduce an algorithm that enables the agents in a network to select their leader without any interference from the outside of the network.

  • 9.
    Shokri-Ghadikolaei, Hossein
    et al.
    KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Fischione, Carlo
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Popovski, Petar
    Aalborg University, Denmark.
    Zorzi, Michele
    Design aspects of short range millimeter wave networks: A MAC layer perspective2016In: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 30, no 3, p. 88-96Article in journal (Refereed)
    Abstract [en]

    Increased density of wireless devices, ever growing demands for extremely high data rate, and spectrum scarcity at microwave bands make the millimeter wave (mmWave) frequencies an important player in future wireless networks. However, mmWave communication systems exhibit severe attenuation, blockage, deafness, and may need microwave networks for coordination and fall-back support. To compensate for high attenuation, mmWave systems exploit highly directional operation, which in turn substantially reduces the interference footprint. The significant differences between mmWave networks and legacy communication technologies challenge the classical design approaches, especially at the medium access control (MAC) layer, which has received comparatively less attention than PHY and propagation issues in the literature so far. In this paper, the MAC layer design aspects of shortrange mmWave networks are discussed. In particular, we explain why current mmWave standards fail to fully exploitthe potential advantages of short range mmWave technology, and argue for the necessity of new collision-awarehybrid resource allocation frameworks with on-demand control messages, the advantages of a collision notification message, and the potential of multihop communication to provide reliable mmWave connections.

  • 10.
    Vondra, Michal
    et al.
    Czech Tech Univ, Prague, Czech Republic..
    Ozger, Mustafa
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Schupke, Dominic
    Airbus, Res & Innovat Wireless Commun, Munich, Germany..
    Cavdar, Cicek
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Integration of Satellite and Aerial Communications for Heterogeneous Flying Vehicles2018In: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 32, no 5, p. 62-69Article in journal (Refereed)
    Abstract [en]

    The rising number of airplanes and UAVs requiring connectivity in the sky puts high demands on all types of networks. In areas without DA2GC coverage, such as sea or oceans, the only option is SC. However, the capacity of SC is limited and insufficient in some cases. Therefore, an extension of DA2GC by A2AC and integration of A2AC and SC is a promising solution to improve available capacity. The main aim of this article is to evaluate limits of SC and A2AC in terms of maximum available capacity and maximum range. The results show that A2AC through DA2GC backhauling is able to overcome capacity available by SC on certain conditions while flying close to the mainland. Integration of A2AC and SC can significantly improve data rate available for UAVs and airplanes, especially if the sky cannot be covered by DA2GC only. Our results show that A2AC can provide capacity up to 93 Mb/s, and it can even exceed the capacity of SC when DA2GC and A2AC distances are short. When SC is overloaded, A2AC can be used instead to provide airplanes with capacity of 37 Mb/s up to 432 km DA2GC distance and 340 km A2AC distance. Besides the evaluation of both networks, the article also summarizes and discusses potential challenges and open issues of integration that need to be considered on the way to successful cooperation of both networks.

1 - 10 of 10
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