Modelling a Hierarchy of Space Applied to Large Road Networks
IGIS '94 Proceedings of the International Workshop on Advanced Information Systems: Geographic Information Systems
Reconsidering wireless systems with multiple radios
ACM SIGCOMM Computer Communication Review
Delivering real-world ubiquitous location systems
Communications of the ACM - The disappearing computer
Location-based Services: Fundamentals and Operation
Location-based Services: Fundamentals and Operation
Alternative localization approach for mobile phones without GPS
Middleware '10 Posters and Demos Track
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A non-intrusive position-sensing technology is critical to the success of location-aware services over mobile phones and PDAs. No single positioning technology can meet the localization requirements across the range of location-aware or location based services. However, for many value added services, it is possible to use locations approximations within certain tolerable thresholds. This paper, in particular, examines how GSM infrastructure can be leveraged for localization of low cost mobile phones with adequate approximations to meet the requirements of certain location aware services especially in countries like India. The feasibility of the approach is demonstrated by pathfinder service (prototype of a location-aware road navigation utility) for Indian cities where road network is very ill structured compared to those in American or European cities. It provides text based driving instructions to a destination when a mobile phone user sends a query via SMS. We also looked at the theoretical issues arising out of optimal shortest path computation over semi-structured road networks and propose a new algorithm for the same.