A master thesis from Aalborg University
Localization Information Retrieval Exploiting Cooperation Among Mobile Devices
Author(s)
Term
10. term
Publication year
2008
Submitted on
2008-07-18
Pages
80 pages
Abstract
Location estimation within cellular networks has been of increasing relevance in the recent years. Several positioning techniques have been developed, but most of them rely on line-of-sight path between the base station antenna and the mobile device. Thus, the performance degrades in densely built urban areas. The Global Positioning System (GPS) is an attractive solution. However, it has several drawbacks. It needs line-of-sight path with the satellites. The time-to-first-fix for a conventional GPS receiver can take several minutes. Additionally, adding GPS functionality to handset can be costly, and drain battery power at an unacceptable rate. The main idea of this project is to exploit cooperation among mobile devices to retrieve their geographical position without using GPS. The approach is fingerprint-based and it exploits Cell ID information. In this context Google has recently launched ‘MyLocation’. We enhanced this service by using cooperation. During this research work, a prototypical system has been developed. Its limitations have been discussed and possible enhancements have been suggested. The main result is that the proposed schema with three cooperative mobile devices can reduce the estimated area of more than five times compared to a non cooperative scenario. Moreover, for three cooperative mobile devices, the distance between the GPS position and the center of the estimated area is about 70 m and, as regard the range of the estimated area, this is about 145 m.
Keywords
Documents
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