HartFi: an energy-efficient localization system

  • Authors:

  • Song Han;Tianji Li;Chen Qian;Douglas Leith;Aloysius K. Mok;Simon S. Lam

  • Affiliations:

  • University of Texas at Austin, Austin, USA;Hamilton Institute, National University of Ireland Maynooth, Kildare, Ireland;University of Texas at Austin, Austin, USA;Hamilton Institute, National University of Ireland Maynooth, Kildare, Ireland;University of Texas at Austin, Austin, USA;University of Texas at Austin, Austin, USA

  • Venue:
  • Proceedings of the 2nd ACM SIGCOMM workshop on Green networking
  • Year:
  • 2011

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Abstract

Location-based applications (LBAs) are emerging to be the killer applications on mobile devices. To know the whereabouts of devices, various interfaces (ie, GPS, WiFi or cellular) can be used to sense their locations. Ideally, localization should be done all the time. However, keeping any of these interfaces running continuously would drain a device's battery rapidly. In this paper, we present a radical design of a collaborative localization system called HF, which enhances existing devices with a low-power 802.15.4-based WH interface. A salient feature of this added interface is that its energy consumption is up to two orders of magnitude less than that of a standard WiFi interface; yet it provides a comparable range of coverage. In the HF system, therefore, WH interfaces are used whenever and wherever it is feasible to share location information that has been obtained using GPS WiFi cellular interfaces. We have designed a mechanism to avoid location error accumulation in HF, which raises its localization accuracy to a level comparable to that of WiFi localization. We are implementing a HartFi system at the moment and current results are promising.