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PERVASIVE'05 Proceedings of the Third international conference on Pervasive Computing
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IEEE Transactions on Mobile Computing
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UbiComp '08 Proceedings of the 10th international conference on Ubiquitous computing
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UIC '08 Proceedings of the 5th international conference on Ubiquitous Intelligence and Computing
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CSTST '08 Proceedings of the 5th international conference on Soft computing as transdisciplinary science and technology
Nericell: rich monitoring of road and traffic conditions using mobile smartphones
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EuroSSC '08 Proceedings of the 3rd European Conference on Smart Sensing and Context
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Pervasive '08 Proceedings of the 6th International Conference on Pervasive Computing
StarTrack: a framework for enabling track-based applications
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Proceedings of the 7th international conference on Mobile systems, applications, and services
Methodologies for Continuous Cellular Tower Data Analysis
Pervasive '09 Proceedings of the 7th International Conference on Pervasive Computing
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SSTD '09 Proceedings of the 11th International Symposium on Advances in Spatial and Temporal Databases
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Technology and Health Care - Smart Environments: Technology to Support Healthcare
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Proceedings of the 4th ACM international workshop on Experimental evaluation and characterization
iLoc: a framework for incremental location-state acquisition and prediction based on mobile sensors
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WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
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PERVASIVE'07 Proceedings of the 5th international conference on Pervasive computing
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UbiComp '07 Proceedings of the 9th international conference on Ubiquitous computing
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AmI'07 Proceedings of the 2007 European conference on Ambient intelligence
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LoCA'07 Proceedings of the 3rd international conference on Location-and context-awareness
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LoCA'07 Proceedings of the 3rd international conference on Location-and context-awareness
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Pervasive and Mobile Computing
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ACM Transactions on Intelligent Systems and Technology (TIST)
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Pervasive and Mobile Computing
Indoor localization without infrastructure using the acoustic background spectrum
MobiSys '11 Proceedings of the 9th international conference on Mobile systems, applications, and services
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UbiComp'06 Proceedings of the 8th international conference on Ubiquitous Computing
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UbiComp'06 Proceedings of the 8th international conference on Ubiquitous Computing
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UbiComp'06 Proceedings of the 8th international conference on Ubiquitous Computing
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AmI'11 Proceedings of the Second international conference on Ambient Intelligence
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SGDA'11 Proceedings of the Second international conference on Serious Games Development and Applications
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Pervasive and Mobile Computing
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ACM Computing Surveys (CSUR)
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BodyNets '13 Proceedings of the 8th International Conference on Body Area Networks
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Accurate indoor localization has long been an objective of the ubiquitous computing research community, and numerous indoor localization solutions based on 802.11, Bluetooth, ultrasound and infrared technologies have been proposed. This paper presents the first accurate GSM indoor localization system that achieves median accuracy of 5 meters in large multi-floor buildings. The key idea that makes accurate GSM-based indoor localization possible is the use of wide signal-strength fingerprints. In addition to the 6-strongest cells traditionally used in the GSM standard, the wide fingerprint includes readings from additional cells that are strong enough to be detected, but too weak to be used for efficient communication. Experiments conducted on three multi-floor buildings show that our system achieves accuracy comparable to an 802.11-based implementation, and can accurately differentiate between floors in both wooden and steel-reinforced concrete structures.