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  • 1.
    Berggren, Fredrik
    et al.
    KTH, Superseded Departments, Wireless at KTH.
    Queseth, Olav
    KTH, Superseded Departments, Wireless at KTH.
    Zander, Jens
    KTH, Superseded Departments, Wireless at KTH.
    Asp, Börje
    Swedish Defence Research Agency (FOI).
    Jönsson, Christian
    Swedish Defence Research Agency (FOI).
    Stenumgaard, Peter
    Swedish Defence Research Agency (FOI).
    Kviselius, Niklas Z
    CIC, Stockholm School of Economics.
    Thörngren, Bertil
    CIC, Stockholm School of Economics.
    Dynamic Spectrum Access, Phase 1 Scenarios and research challenges2004Report (Other academic)
    Abstract [en]

    The currently used mechanisms for spectrum management are a contributing factor to the long lead times from innovation to market in wireless technologies andsystems. This has in turn been a major contributing factor to the dominance of the large telecom companies in the European and World markets, whereas very few innovative enterprises have exhibited consistent growth, although the technicalcompetence in Sweden is very high in this area. Alternative spectrum management regimes, such as the introduction of "unlicensed bands" have proven very effective in lowering entry thresholds for smaller companies (e.g the WLAN business). In addition, experts claim that the spectrum requirements for communication purposes will increase by as much as 200-300 % up to 2010. At the same time the actual usage of the electromagnetic spectrum is very inefficient.

    The project aims at studying new more, flexible, spectrum allocation regimeswhich, in combination with new technologies, such as multi-radio access, novelbroadband access techniques, software defined radio and spatial techniques (e.g.smart antennas, multi-hop schemes) have the potential of lowering the entry thresholds for new actors and provide radical improvement to the efficiency ofspectrum usage. Further the aim is to investigate the economic and regulatory consequences of such Dynamic Spectrum Access technologies and managementregimes. The results will provide input to future policies in spectrum management. The project has been divided into a first, pre-study phase and a second, research phase. The first phase was launched in Dec of 2004 and the second phase is planned to start in Jan 2005. The first phase of the project, reported here, has the aim toprovide a qualitative assessment of the potential benefits of dynamic spectrum access regimes. The analysis in the report and other studies in the area, indeed indicate there is a potential to both lower the entry thresholds for new actors as well as provide radical improvement to the efficiency of spectrum usage. The area isdefinitely of significant issues and the project should be continued studying the DSA concepts in more detail.

    Further, using a systematic procedure, a number of critical areas and bottleneck problems were identified. Our conclusion is that more research is needed in theseareas to achieve the above mentioned benefits. As `side effect' in this procedure, a number of novel and interesting spectrum management concepts were derived, e.g.the `real-time spectrum trading' and `use rights' concepts. Out of this gross list ofinterest problems, a number of highly important problems were selected, matching the competence of the project team. These problems are proposed to be the focus ofthe next phase in the project.

    Finally, the report provides an overview of the most important ongoing research and policy-making activities in the DSA-area.

  • 2.
    Bria, Aurelian
    et al.
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Flament, Maxime
    Chalmers University of Technology.
    Gessler, Fredrik
    KTH, Superseded Departments, Industrial Economics and Management.
    Queseth, Olav
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Stridh, Rickard
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Unbehaun, Matthias
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Wu, Jiang
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Zander, Jens
    KTH, Superseded Departments, Wireless at KTH.
    Overall design of 4th Generation Wireless Infrastructures (4GW)2002Conference paper (Refereed)
    Abstract [en]

    An important factor contributing to this uncertainty is that we have very limited knowledge about the future environment in which a fourth generation wireless infrastructure should function. Which of today's systems will still exist when a potential 4G infrastructure is deployed? Which systems and solutions will be considered successful then? What technical bottlenecks will be apparent ten years from now? What market impact will third generation wireless systems have? How will this affect user behavior, and user demands? How much money do prospective users have available to pay for services provided over this infrastructure? This paper presents some of the conclusion of of the Fourth Generation Wireless Infrastructure project (4GW) of the Personal Computing and Communications program (PCC), the major Swedish academic research effort on future communications systems launched in late 1997(1). The vision of the PCC project has been "Personal Multimedia to everyone at today's prices for fixed telephony". In 4GW a scenario-based approach has been used to tackle the issue of identifying reasonable research topics. In the paper we will present this method, and demonstrate how it interfaces with traditional research methods in the fields that the 4GW project incorporates. We will also give an overview of some research results from the project. Finally, we will conclude these results as a vision of what fourth generation wireless infrastructures might become

  • 3.
    de Bruin, Peter
    et al.
    Ericsson Research, Sweden.
    Craig, Stephen
    Ericsson AB, SE-164 80 Stockholm, Sweden.
    Furuskär, Anders
    KTH, Superseded Departments, Wireless at KTH.
    A Simple high capacity multiple service solution with controlled QoS for GERAN2002In: IEEE 55TH VEHICULAR TECHNOLOGY CONFERENCE, VTC SPRING 2002, VOLS 1-4, PROCEEDINGS, IEEE , 2002, p. 1728-1732Conference paper (Refereed)
    Abstract [en]

    Offering multiple services with high spectral efficiency is crucial for 3rd generation cellular systems. Further, for stable system behavior, controlling quality of service (QoS) for offered loads beyond the capacity limit of the systems is required. This paper describes and evaluates a simple, easy-to-plan concept that accomplishes this goal for the GSM/EDGE Radio Access Network (GERAN). Cornerstones of the concept are tight frequency reuse, service-based power setting and power-based admission control. Preliminary results indicate that the proposed solution manages to preserve targeted QoS for a mix of services at excessive traffic loads. Moreover, different operator QoS policies may be realized in a straightforward manner.

  • 4.
    Escudero-Pascual, Alberto
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Maguire Jr., Gerald Q.
    KTH, Superseded Departments, Wireless at KTH. KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Role(s) of a proxy in location based services2002In: 13TH IEEE INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOL 1-5, PROCEEDINGS: SAILING THE WAVES OF THE WIRELESS OCEANS, IEEE , 2002, p. 1252-1256Conference paper (Refereed)
    Abstract [en]

    We examine a number of roles that a proxy server can play in location based services and how it can be used to provide protection of personal identifiable information. Location data, service requests, and privacy policies are encoded in XML by the mobile terminal and forwarded to a proxy server placed between the mobile terminal and the location based service(s). By a suitable architecture in the mobile terminal and in the proxy, we can hide the mobile device's network location, hide the identity of its user, and, in some cases, provide misleading physical location(s). We have applied our privacy model to location information obtained from a GPS receiver. The GPS-based method was chosen as being the only available method where the positioning calculation function (PCF) is fully under the user's control, since the position is calculated within the mobile terminal; other technologies rely on the network infrastructure, and hence some or all of the position data is outside the user's control. A proof of concept was implemented using Fastrax's iTrax02 small, ultra-low power consumption GPS receiver. We illustrate a number of different functions which can be provided by examining some scenarios.

  • 5.
    Flament, Maxime
    et al.
    Chalmers University of Technology.
    Gessler, Fredrik
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Lagergren, Fredrik
    KTH, Superseded Departments, Industrial Economics and Management.
    Queseth, Olav
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Stridh, Rickard
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Unbehaun, Matthias
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Wu, Jiang
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Zander, Jens
    KTH, Superseded Departments, Wireless at KTH.
    Telecom scenarios for the 4th Generation Wireless Infrastructures1998Conference paper (Refereed)
    Abstract [en]

    Telecommunication infrastructure deployment, incontrast to the rest of the communication area, is a slowand costly process, demanding a long-range strategic perspective in decision making. Determining key issues for strategic research in this area is thus very important. This paper describes detailed work to that aim, within the PCC project. The aim was to find possible scenariosfor the 4th Generation Wireless Infrastructures (4GW)around year 2010 and to determine their implications onthe direction of research in wireless communications.

    In this scenario work, a number of trends were created based on the current state of technology, economy and politics. These trends are verified by using Delphi methods. Based on these trends and additional research,three vivid scenarios are built, which picture differentways the trends may develop, The scenarios are called:"Big Brother Scenario", "Anything-Goes Scenario" and"Pocket Computing Scenario". At the end, the paper discusses the implications of the scenarios on thewireless communication research areas. In particular, the working assumptions and key research problems in eachwork package in the 4th Generation Wireless Infrastructure project are verified and prioritized according to the scenarios.

  • 6.
    Giles, Tim
    et al.
    KTH, Superseded Departments, Wireless at KTH.
    Markendahl, Jan
    KTH, Superseded Departments, Wireless at KTH.
    Zander, Jens
    KTH, Superseded Departments, Wireless at KTH.
    Zetterberg, Per
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Karlsson, P
    Cost drivers and deployment scenarios for future broadband wireless networks: Key research problems and directions for research2004In: VTC2004-SPRING: 2004 IEEE 59TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-5, PROCEEDINGS, NEW YORK: IEEE , 2004, p. 2042-2046Conference paper (Refereed)
    Abstract [en]

    The most prominent problem in providing anywhere, anytime wideband mobile access is the towering infrastructure cost as it is basically proportional to the bandwidth provided. In this paper, we provide a simple, initial, analysis of the various infrastructure cost factors. This analysis shows that, contrary to what one may expect, the infrastructure cost is not dominated by electronic equipment, but rather by other deployment related costs (towers, wiring,, building, network connections) and maintenance costs. In the paper some novel architectural approaches for future wideband mobile access focusing on these dominant cost factors are described and the related key research issues are discussed.

  • 7.
    Giles, Tim
    et al.
    KTH, Superseded Departments, Wireless at KTH.
    Markendahl, Jan
    KTH, Superseded Departments, Wireless at KTH.
    Zander, Jens
    KTH, Superseded Departments, Wireless at KTH.
    Zetterberg, Per
    KTH, Superseded Departments, Wireless at KTH.
    Karlsson, Peter
    TeliaSonera Sweden.
    Lind, Jonas
    Stockholm School of Economics.
    Malmgren, Göran
    Ericsson Research.
    Nilsson, Jan
    Swedish Defense Research Agency.
    Cost Drivers and Deployment Scenarios for Future Braodband Wireless Networks - Key research problems and directions for research2004Conference paper (Refereed)
    Abstract [en]

    The most prominent problem in providing anywhere, anytime wideband mobile access is the towering infrastructure cost as it is basically proportional to the bandwidth provided. In this paper, we provide a simple, initial, analysis of the various infrastructure cost factors. This analysis shows that, contrary to what one may expect, the infrastructure cost is not dominated by electronic equipment, but rather by other deployment related costs (towers, wiring, building, network connections) and maintenance costs. In the paper some novel architectural approaches for future wideband mobile access focusing on these dominant cost factors are described and the related key research issues are discussed.

  • 8.
    Hultell, Johan
    et al.
    KTH, Superseded Departments, Wireless at KTH.
    Johansson, Klas
    KTH, Superseded Departments, Wireless at KTH.
    Markendahl, Jan
    KTH, Superseded Departments, Wireless at KTH.
    Business models and resource management for shared wireless networks2004In: VTC2004-FALL: 2004 IEEE 60TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-7 - WIRELESS TECHNOLOGIES FOR GLOBAL SECURITY, NEW YORK: IEEE , 2004, p. 3393-3397Conference paper (Refereed)
    Abstract [en]

    In this paper we analyze main use cases for sharing wireless access networks between multiple operators and service providers. Network sharing has been proposed as a metho l to lower roll-out costs for 3G operators in Europe, and is widely used in WLAN systems where local access providers offer wireless access to service providers. A similar structure also exist in cellular networks where Mobile Virtual Network Operators (MVNO) provide mobile services without having a mobile network of their own. The development points at a further fragmentation of wireless access networks into specialized service providers that connect to local service and access providers, possibly via an inter-connection provider serving with core network functionality. In this context, we propose a framework for how radio resources could be managed using Service Level Agreements (SLA) and analyze key differences between the SLA for different types of service and network providers.

  • 9.
    Johansson, Klas
    et al.
    KTH, Superseded Departments, Wireless at KTH.
    Furuskär, Anders
    Karlsson, Peter
    Zander, Jens
    KTH, Superseded Departments, Wireless at KTH.
    Relation between base station characteristics and cost structure in cellular systems2004In: 2004 IEEE 15TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOLS 1-4, PROCEEDINGS, NEW YORK: IEEE , 2004, p. 2627-2631Conference paper (Refereed)
    Abstract [en]

    A simple method for estimating the costs of building and operating a cellular mobile network is proposed. Using empirical data from a third generation mobile system (WCDMA) it is shown that the cost is driven by different factors depending on the characteristics of the base stations deployed. When site density increase, operational and transmission costs tend to dominate rather than radio equipment and site costs. The results also show how, for different capacity requirements, the costs can be minimized by a proper selection of for example macro, micro and pico base stations. In many scenarios the macro base stations yield the lowest cost, indicating that coverage (cell range) is an important parameter when designing wireless systems.

  • 10.
    Johansson, Klas
    et al.
    KTH, Superseded Departments, Wireless at KTH.
    Lind, Jonas
    CIC, Stockholm School of Economics.
    Berg, Miguel
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Hultell, Johan
    KTH, Superseded Departments, Wireless at KTH.
    Kviselius, Niklas
    CIC, Stockholm School of Economics.
    Markendahl, Jan
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Prytz, Mikael
    Ericsson Research.
    Integrating User Deployed Local Access Points in a Mobile Operator´s Network2004Conference paper (Refereed)
    Abstract [en]

    A concept is outlined for how privately deployed local access points can be integrated in a mobile operator's network. By letting the users deploy multi-radio access points, reusing already installed broadband for `last-mile'-access, we can expect significant cost savings in particular for high data rate services with low QoS requirements.  The concept is presented both from a technical perspective as well as from a business point of view, where the network franchise model is introduced.

  • 11.
    Karlson, Bo
    et al.
    KTH, Superseded Departments, Wireless at KTH.
    Bria, Aurelian
    KTH, Superseded Departments, Wireless at KTH.
    Lönnqvist, Peter
    KTH, Superseded Departments, Wireless at KTH.
    Norlin, Cristian
    KTH, Superseded Departments, Wireless at KTH.
    Lind, Jonas
    KTH, Superseded Departments, Wireless at KTH.
    Wireless Foresight: Scenarios of the Mobile World in 20152003Book (Other academic)
    Abstract [en]

    We are entering exciting times. After the decade when the Internet and the cell-phone changed our lives and working habits, these two technologies are about to merge. At the same time, the industry is going through one of its worst crises ever. At this crossroads, the future can take any direction. Up or down. Success or failure.    This is the website of the final report from the scenario project Wireless Foresight. The report deals with the state of the wireless industry in 2015 and presents four scenarios of the future: »Wireless Explosion – Creative Destruction«, »Slow Motion«, »Rediscovering Harmony«, and »Big Moguls and Snoopy Governments«. From the scenarios, important areas for technological research are identified. A number of critical challenges facing industry are identified: the high cost for infrastructure, the slow spectrum release, the stampeding system complexity, radiation, battery capacity, and the threat of a disruptive market change facing the telco industry.   The project has been initiated by Wireless@KTH, a research and educational center formed by the Royal Institute of Technology (KTH) in cooperation with industry.

  • 12.
    Koo, Insoo
    et al.
    Dept. of Infor. and Comm., Gwang-Ju Institute of Science and Technology, 1 Oryong-dong, Puk-gu, Gwangju, 500-712, Korea.
    Furuskär, Anders
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Zander, Jens
    KTH, Superseded Departments, Wireless at KTH.
    Kim, Kiseon
    Dept. of Infor. and Comm., Gwang-Ju Institute of Science and Technology, 1 Oryong-dong, Puk-gu, Gwangju, 500-712, Korea.
    Erlang Capacity Analysis of Multi-access Systems Supporting Voice and Data Services2004In: PERSONAL WIRELESS COMMUNICATIONS, PROCEEDINGS, Berlin: Springer , 2004, p. 643-645Conference paper (Refereed)
    Abstract [en]

    In this paper, we analyze and compare the Erlang capacity ofmulti-access systems supporting several different radio access technologies according to two different operation methods: separate and common operation methods. In the common operation, any terminal can connect to any sub-system while each terminal in the separate operation only can connect to its designated sub-system. In a numerical example withGSM/EDGE-like and WCDMA-like sub-systems, it is shown that wecan get up to 60% Erlang capacity improvement through the common operation method when using a near optimum so-called service-based user assignment scheme. Even with the worst-case assignment scheme, we can still get about 15% capacity improvement over the separate operation method.

  • 13.
    Koo, Insoo
    et al.
    Dept. of Infor. and Comm., Gwang-Ju Institute of Science and Technology, 1 Oryong-dong, Puk-gu, Gwangju, 500-712, Korea.
    Furuskär, Anders
    KTH, Superseded Departments, Wireless at KTH.
    Zander, Jens
    KTH, Superseded Departments, Wireless at KTH.
    Kim, Kiseon
    Dept. of Infor. and Comm., Gwang-Ju Institute of Science and Technology, 1 Oryong-dong, Puk-gu, Gwangju, 500-712, Korea.
    Erlang Capacity of Multi-Access Systems with Service-based Access Selection2004In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 8, no 11, p. 662-664Article in journal (Refereed)
    Abstract [en]

    In this letter, we provide the lower and upper bounds of Erlang capacity of multi-access systems supporting several different radio access technologies in the multi-service scenario, by considering two extreme operation methods; separate and common operation. In a numerical example with GSM/EDGE-like and WCDMA-like sub-systems, it is shown that the common operation method can provide up to 60% Erlang capacity improvement over the separate operation method when using a near optimum so-called service-based user assignment scheme, with the combined effects of the assignment and the trunking gains. Even in the worst-case, the common operation method still can provide about 15% capacity improvement over the separate operation method, which mainly comes from the trunking gain.

  • 14.
    Samuelsson, Jonas
    KTH, Superseded Departments, Signals, Sensors and Systems. KTH, Superseded Departments, Wireless at KTH.
    Waveform quantization of speech using Gaussian mixture models2004In: 2004 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, VOL I, PROCEEDINGS: SPEECH PROCESSING, IEEE , 2004, p. 165-168Conference paper (Refereed)
    Abstract [en]

    Waveform quantization of speech using Gaussian mixture models (GMMs) is proposed. GMMs are trained directly on the speech waveform, and high dimensional vector quantizers (VQs) that efficiently exploit the redundancy are constructed based on the GMM parameters. Two types of GMMs are studied. The complexity of the scheme is independent of the rate, and the rate can be changed without retraining the VQ. A shape-gain structure improves performance and robustness. Pre- and post-processing using spectral amplitude warping further improves perceptual quality. A 32-dimensional VQ operating at 2 bits/sample reproduces speech sampled at 8 kHz with a PESQ score of 4.2.

  • 15. Thaung, Jörgen
    et al.
    Beckman, Claes
    KTH, Superseded Departments (pre-2005), Wireless at KTH.
    Abrahamsson, Maths
    Sjöstrand, Johan
    The importance of optical and psychophysical test parameters for the determination of the light scattering factor1995Conference paper (Other academic)
  • 16.
    Zander, Jens
    KTH, Superseded Departments, Wireless at KTH.
    Affordable Multiservice Wireless Networks - Research challenges for the next decade2002In: 13TH IEEE INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOL 1-5, PROCEEDINGS - SAILING THE WAVES OF THE WIRELESS OCEANS, New York: IEEE , 2002, p. 1-4Conference paper (Refereed)
    Abstract [en]

    What the consumer of telecommunication services of tomorrow will expect to receive besides some vauge notion of "Wireless Internet" is not that clear. However to obtain a widespread demand for wireless services, they have to be widely available, simple to purchase and access. Affordability and adaptation to user requirements, rather than revolutionary higher performance, will be the key design features of future wireless access systems. In this paper we briefly analyze the key cost drivers and discuss some architectural concepts for affordable wireless infrastructures. Some research directions & challenges for the next decade are outlined.

  • 17.
    Zander, Jens
    et al.
    KTH, Superseded Departments, Wireless at KTH.
    Markendahl, Jan
    KTH, Superseded Departments, Wireless at KTH.
    Low Cost Broadband Wireless Access – Key Research Problems and Business Scenarios2004Conference paper (Refereed)
    Abstract [en]

    The most prominent problem in providing any-where, anytime wideband mobile access is the towering infrastructure cost as it is basically proportional to the bandwidth provided. In this paper, we provide a simple, initial, analysis of the various infrastructure cost factors. This analysis shows that, contrary to what one may expect, the infrastructure cost is not dominated by electronic equipment, but rather by other deployment related costs (towers, wiring, building, network connections) and maintenance costs. In the paper some novel architectural approaches for future wideband mobile access focusing on these dominant cost factors are described and the related key research issues are discussed.

1 - 17 of 17
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