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      • Department of Electrical and Electronics Engineering
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      A novel queue-aware wireless link adaptation mechanism and its fixed-point analytical model

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      Author(s)
      Ozturk, O.
      Akar, N.
      Date
      2015
      Source Title
      Eurasip Journal on Wireless Communications and Networking
      Print ISSN
      1687-1472
      Publisher
      SpringerOpen
      Volume
      2015
      Issue
      1
      Pages
      1 - 20
      Language
      English
      Type
      Article
      Item Usage Stats
      117
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      Abstract
      A point-to-point (PTP) wireless link is studied that carries long-lived TCP flows and is controlled with active queue management (AQM). A cross-layer queue-aware adaptive modulation and coding (AMC)-based link adaptation (LA) mechanism is proposed for this wireless link to improve the TCP-level throughput relative to the case where AMC decisions are made based solely on the physical layer (PHY) parameters. The proposed simple-to-implement LA mechanism involves the use of an aggressive modulation and coding scheme (MCS) with high spectral efficiency and high block error rates when the queue occupancy exceeds a certain threshold, but otherwise a relatively conservative MCS with lower spectral efficiency and lower block error rates. A fixed-point analytical model is proposed to obtain the aggregate TCP throughput attained at this wireless link and the model is validated by ns-3 simulations. Numerical experimentation with the proposed analytical model applied to an IEEE 802.16-based wireless link demonstrates the effectiveness of the proposed queue-aware LA (QAWLA) mechanism in a wide variety of scenarios including cases where the channel information is imperfect. The impact of the choice of the queue occupancy threshold of QAWLA is extensively studied with respect to the choice of AQM parameters in order to provide engineering guidelines for the provisioning of the wireless link.
      Keywords
      Fixed-point TCP model
      IEEE 802.16
      Queue-aware link adaptation
      Analytical models
      Efficiency
      Local area networks
      Modulation
      Network layers
      Queueing theory
      Rayleigh fading
      Transmission control protocol
      Active queue management
      Adaptive modulation and coding
      High spectral efficiency
      Link adaptation
      Modulation and coding schemes
      Numerical experimentations
      TCP modeling
      Queueing networks
      Permalink
      http://hdl.handle.net/11693/25702
      Published Version (Please cite this version)
      http://dx.doi.org/10.1186/s13638-015-0469-0
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      • Department of Electrical and Electronics Engineering 3702
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