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Träfflista för sökning "WFRF:(Johansson Karl Åke) "

Search: WFRF:(Johansson Karl Åke)

  • Result 1-10 of 17
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1.
  • Cabrera Molero, Inés, et al. (author)
  • Cross-layer adaptation for TCP-based applications in WCDMA systems
  • 2005
  • Conference paper (peer-reviewed)abstract
    • In this paper, we consider TCP-based applications over a high bandwidth wireless channel, such as the High-Speed Downlink Packet Access (HSDPA) channel in aWCDMAsystem, in two setups: a nominal one that employs end-to-end TCPReno and a new one that employs Cross-Layer Adaptation (CLA) in the form of Radio Network Feedback (RNF). For theCLAsetup, the Radio Resource Management unit in the Radio Network Controller (RNC) provides a proxy with reports on the radio link bandwidth and the queue level. The proxy transport layer takes appropriate actions on these reports. By doing so, it utilizes the air-interface spectrum more efficiently and keeps the layer-2 queue in the RNCclose a predetermined level. These new control mechanisms are evaluated through ns-2 simulations. In a number of realistic use cases it is shown that the new CLAsetup reduces the time to serve users, and substantially increases the radio link utilization and decreases the required buffer size in the RNC.
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3.
  • Haas, Rüdiger, 1966, et al. (author)
  • Status of the Onsala Twin Telescopes – One Year After the Inauguration
  • 2019
  • In: IVS 2018 General Meeting Proceedings "Global Geodesy and the Role of VGOS – Fundamental to Sustainable Development". ; NASA/CP-2019-219039, s. 17-19
  • Conference paper (peer-reviewed)abstract
    • We briefly describe the status of the Onsala twin telescopes and the experience gained since the official inauguration in May 2017.
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4.
  • Haas, Rüdiger, 1966, et al. (author)
  • Status of the Onsala Twin Telescopes – Two Years After the Inauguration
  • 2019
  • In: Proceedings of the 24th European VLBI Group for Geodesy and Astrometry Working Meeting. - 9788441656345 ; , s. 5-9
  • Conference paper (peer-reviewed)abstract
    • We give a brief overview on the status of the Onsala twin telescopes (OTT), two years after their inauguration. The dierent components of the VGOS systems are briefly described, and the development towards routine operations.
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  • Möller, Niels, et al. (author)
  • Supporting end-to-end applications over HSDPA by cross-layer signalling
  • 2007
  • In: IEEE WIRELESS COMMUNICATIONS & NETWORKING CONFERENCE, VOLS 1-9. - NEW YORK : IEEE. - 9781424406586 ; , s. 3858-3863
  • Conference paper (peer-reviewed)abstract
    • A new control structure is proposed to improve user experience of wireless Internet. Information on radio bandwidth and queue length available in the radio network, close to the base station, is used in a proxy that resides between the Internet and the cellular system. The control algorithm in the proxy sets the window size according to event-triggered information on radio bandwidth changes and time-triggered information on the queue length at the wireless link. The mechanism is compared to TCP Reno in two simulation scenarios. The first scenario models a dedicated channel with stepwise changes in the bandwidth, while the second scenario models the High-speed Downlink Shared Channel recently introduced by 3GPP. The proposed mechanism significantly reduces the amount of buffer space needed in the radio network, and it also gives modest improvements to user response time and link utilization. Reduced buffering is particularly beneficial for third-party end-to-end real-time services such as voice, video, and online gaming.
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7.
  • Möller, Niels, et al. (author)
  • Using radio network feedback to improve TCP performance over cellular networks
  • 2005
  • In: Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference 2005. - : IEEE. - 0780395689 ; , s. 7434-7439
  • Conference paper (peer-reviewed)abstract
    • A new control structure is proposed to improve user experience of wireless Internet. Information on radio bandwidth and queue length available in the radio network controller (RNC), close to the base station, is used in a proxy that resides between the Internet and the cellular system. The control algorithm in the proxy sets the window size according to event-triggered information on radio bandwidth changes and time-triggered information on the queue length of the RNC. A stability analysis of the hybrid control system is performed. In a number of realistic use cases evaluated in ns-2, the new control structure is compared to a nominal one that employs end-to-end TCP Reno. It is shown that the proposed solution reduces the time to serve users, increases the radio link utilization, and decreases the required buffer size in the RNC.
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10.
  • Pantaleev, Miroslav, 1970, et al. (author)
  • Onsala Space Observatory – IVS Technology Development Center
  • 2011
  • In: International VLBI Service for Geodesy and Astrometry 2010 Annual Report, edited by D. Behrend and K.Baver. ; :NASA/TP-2011-215880, s. 280-283
  • Book chapter (other academic/artistic)abstract
    • This report briefly describes the technical development relevant for geodetic/astrometric VLBI done during 2010 at the Onsala Space Observatory.
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  • Result 1-10 of 17
Type of publication
conference paper (11)
book chapter (4)
reports (1)
journal article (1)
Type of content
peer-reviewed (9)
other academic/artistic (8)
Author/Editor
Haas, Rüdiger, 1966 (12)
Pantaleev, Miroslav, ... (10)
Helldner, Leif, 1969 (8)
Elgered, Gunnar, 195 ... (4)
Pettersson, Lars, 19 ... (4)
Alef, Walter (3)
show more...
Tuccari, Gino (3)
HAGSTRÖM, MAGNE, 194 ... (3)
Arvidsson, Åke (3)
Billade, Bhushan, 19 ... (3)
Monje, Raquel, 1979 (2)
Johansson, Karl Henr ... (2)
Ivashina, Marianna, ... (2)
Pavolotskiy, Alexey, ... (2)
Belitsky, Victor, 19 ... (2)
Rottmann, Helge (2)
Wagner, Jan (2)
Dornbusch, Sven (2)
Vassilev, Vessen, 19 ... (2)
Hammargren, Roger, 1 ... (2)
Flygare, Jonas, 1988 (2)
Booth, Roy, 1938 (2)
Meledin, Denis, 1974 (2)
Sundin, Erik, 1979 (2)
Petterson, Lars (2)
Fredrixon, Mathias, ... (2)
Lapkin, Igor, 1963 (2)
Ferm, Sven-Erik, 196 ... (2)
Svensson, Magnus, 19 ... (2)
et, al. (1)
Pettersson, Lars (1)
Roy, A. (1)
Fischione, Carlo (1)
Yang, Jian, 1960 (1)
Johansson, Karl H. (1)
Conway, John, 1963 (1)
Roy, Alan L. (1)
Rottmann, H. (1)
Bencivenni, Carlo, 1 ... (1)
Olofsson, Hans, 1952 (1)
Dornbusch, S. (1)
Wunderlich, M. (1)
La Porta, Laura (1)
Olberg, Michael, 195 ... (1)
Klein, Benjamin, 198 ... (1)
Hobiger, Thomas, 197 ... (1)
Bergman, Per, 1960 (1)
Lerner, Mikael, 1967 (1)
Risacher, C. (1)
Risacher, Christophe ... (1)
show less...
University
Chalmers University of Technology (14)
Royal Institute of Technology (3)
Language
English (17)
Research subject (UKÄ/SCB)
Engineering and Technology (12)
Natural sciences (11)

Year

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