• DocumentCode
    57411
  • Title

    Increasing Opportunistic Gain in Small Cells Through Energy-Aware User Cooperation

  • Author

    Qing Wang ; Rengarajan, Balaji ; Widmer, James

  • Author_Institution
    IMDEA Networks Inst., Madrid, Spain
  • Volume
    13
  • Issue
    11
  • fYear
    2014
  • fDate
    Nov. 2014
  • Firstpage
    6356
  • Lastpage
    6369
  • Abstract
    To meet the increasing demand for wireless capacity, future networks are likely to consist of dense layouts of small cells. The number of users in each cell is thus reduced, which results in diminished gains from opportunistic scheduling, particularly under dynamic traffic loads. We propose a user-initiated base station (BS)-transparent traffic spreading approach that leverages user-user communication to increase BS scheduling flexibility. The proposed scheme can increase opportunistic gain and improve user performance. For a specified tradeoff between performance and power expenditure, we characterize the optimal policy by modeling the system as a Markov decision process and also present a heuristic algorithm that yields significant performance gains. Our simulations show that, in the performance-centric case, average file transfer delays are lowered by up to 20% even in homogeneous scenarios and up to 50% with heterogeneous users. Further, we show that the bulk of the performance improvement can be achieved with a small increase in power expenditure, e.g., in an energy-sensitive case, up to 78% of the performance improvement can be typically achieved at only 20% of the power expenditure of the performance-centric case.
  • Keywords
    Markov processes; cellular radio; cooperative communication; scheduling; telecommunication power management; telecommunication traffic; BS scheduling flexibility; Markov decision process; base station-transparent traffic spreading; energy-aware user cooperation; opportunistic gain; opportunistic scheduling; small cells; user-user communication; Delays; Dispatching; Dynamic scheduling; Heuristic algorithms; Servers; Vectors; Wireless communication; Energy efficiency; Small cells; file transfer delay; opportunistic scheduling; user???user communication;
  • fLanguage
    English
  • Journal_Title
    Wireless Communications, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    1536-1276
  • Type

    jour

  • DOI
    10.1109/TWC.2014.2331260
  • Filename
    6837497