A GPS sensing strategy for accurate and energy-efficient outdoor-to-indoor handover in seamless localization systems

Yungeun Kim, Songhee Lee, Seokjoon Lee, Hojung Cha

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Indoor localization systems typically locate users on their own local coordinates, while outdoor localization systems use global coordinates. To achieve seamless localization from outdoors to indoors, a handover technique that accurately provides a starting position to the indoor localization system is needed. However, existing schemes assume that a starting position is known a priori or uses a naïve approach to consider the last location obtained from GPS as the handover point. In this paper, we propose an accurate handover scheme that monitors the signal-to-noise ratio (SNR) of the effective GPS satellites that are selected according to their altitude. We also propose an energy-efficient handover mechanism that reduces the GPS sampling interval gradually. Accuracy and energy efficiency are experimentally validated with the GPS logs obtained in real life.

Original languageEnglish
Pages (from-to)315-332
Number of pages18
JournalMobile Information Systems
Volume8
Issue number4
DOIs
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Computer Networks and Communications

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