Signal dragging: effects of terminal movement on war-driving in CDMA/WCDMA networks

  • Authors:

  • Daehyung Jo;Jeongkeun Lee;Semun Lee;Taejoon Ha;Taekyoung Kwon;Yanghee Choi

  • Affiliations:

  • School of Computer Science and Engineering, Seoul National University;School of Computer Science and Engineering, Seoul National University;School of Computer Science and Engineering, Seoul National University;Radiant Technologies, Inc.;School of Computer Science and Engineering, Seoul National University;School of Computer Science and Engineering, Seoul National University

  • Venue:
  • LoCA'07 Proceedings of the 3rd international conference on Location-and context-awareness
  • Year:
  • 2007

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Abstract

In cellular networks, the signal pattern reported by a mobile terminal has been the major source for localization. In this paper we show how the signal pattern is affected by the terminal movement such as the speed and the moving direction in CDMA/WCDMA networks. When the mobile terminal is moving, its signal pattern tends to contain more signals from base stations positioned opposite of the terminal's moving direction than signals from base stations positioned in the forward. We call this phenomenon "signal dragging". If the signal dragging prevails, it naturally provides a useful hint for figuring out the movement of a terminal, e.g., direction. We also show that the accuracy of the localization algorithm based on pattern matching varies greatly depending on the terminal movement. Based on these experimental results in commercial networks we suggest the practical data collection procedure, e.g., the war-driving, should consider the terminal movement. Otherwise the use of war-driving data can be harmful.