Adaptive cross-layer protocol design for opportunistic WLANs over TVWS

Mohammad J. Abdel-Rahman, Harish Kumar Shankar, Marwan Krunz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

The proliferation of bandwidth-hungry multimedia traffic over IEEE 802.11-based WLANs has over-crowded the ISM bands. The opening of the UHF TV bands by the FCC for unlicensed opportunistic operation promises to relieve the demand on these bands. However, supporting bandwidth-intensive media streaming applications over TV white spaces can be quite challenging. This is due to the unpredictable nature of spectrum availability combined with the fluctuations of channel quality. The realization of this herculean feat through unlicensed usage, whilst providing protection to licensed primary users, requires intelligent and adaptive protocol design. In this paper, we propose a QoS-aware parallel sensing/probing architecture, called QASPA, which exploits inherent channel and user diversities exhibited by the wireless system. Aiming at maximizing sensing efficiency while achieving a high detection accuracy, QASPA incorporates an adaptive double-threshold-based sensing mechanism. It also embodies a cross-layer protocol, which uses an adaptive framing structure to minimize the control overhead, and a novel spectrum assignment strategy targeted at improving the spatial reuse of the network. The proposed spectrum assignment strategy supports both channel bonding and aggregation. Our simulations validate the ability of QASPA in guaranteeing the demands of high-bandwidth opportunistic media streams while supporting low-bandwidth streams. They also show the superior performance of QASPA compared to the scheme used in the ECMA-392 standard (for opportunistic indoor streaming).

Original languageEnglish (US)
Title of host publication2014 IEEE International Symposium on Dynamic Spectrum Access Networks, DYSPAN 2014
PublisherIEEE Computer Society
Pages519-530
Number of pages12
ISBN (Print)9781479926619
DOIs
StatePublished - Jan 1 2014
Event2014 IEEE International Symposium on Dynamic Spectrum Access Networks, DYSPAN 2014 - McLean, VA, United States
Duration: Apr 1 2014Apr 4 2014

Publication series

Name2014 IEEE International Symposium on Dynamic Spectrum Access Networks, DYSPAN 2014

Other

Other2014 IEEE International Symposium on Dynamic Spectrum Access Networks, DYSPAN 2014
CountryUnited States
CityMcLean, VA
Period4/1/144/4/14

Keywords

  • Channel allocation
  • channel probing
  • integer programming
  • multimedia communication
  • opportunistic access radio
  • spectrum sensing

ASJC Scopus subject areas

  • Computer Networks and Communications

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