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ThinkMind // International Journal On Advances in Intelligent Systems, volume 2, number 4, 2009 // View article intsys_v2_n4_2009_1


Estimation of Mobile User’s Trajectory in Mobile Wireless Network

Authors:
Sarfraz Khokhar
Arne A. Nilsson

Keywords: mobile location; mobile trajectory; mobile trjectory-based Services; GIS; map matching; mobility profile.

Abstract:
There has been extensive research and development on Location Based Services (LBS). The focus here is on the present location of the mobile user. A new trend of mobile wireless services based on trajectory of a mobile phone and hence that of a mobile user, called Mobile Trajectory Based Services (MTBS) is emerging. We propose trajectory estimation method suitable for MTBS which uses an adaptive polling scheme such that the polling is not frequent to overburden the air resources unnecessarily, and it is not sparse that leads to an ambiguous and erroneous mobility profile. The polling method includes a new map matching scheme using GIS (Geographical Information System) map. The scheme is based on previous location, map topology and travel time from one intersection to the other. So, from erroneous and moderately polled location points with time stamps, we form a spatiotemporal trajectory for a mobile user. A set of such trajectories for all days of the week would form a mobility profile, on which plethora of MTBS could be provisioned. We present a framework, formulation, and design for mobile user’s trajectory. We ran trajectory simulation for an urban area of St. Paul, Minnesota and a suburban area of North Carolina. Our design worked very well in the urban area for location error of 100 meters or less. For the rural area, we ran simulation for location error up to 400 meters. The trajectory estimation error was very minimal.

Pages: 384 to 410

Copyright: Copyright (c) to authors, 2009. Used with permission.

Publication date: March 17, 2010

Published in: journal

ISSN: 1942-2679

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