Location Based Systems are now a ubiquitous part of everyday life, seamlessly assisting us in everything we do from driving our cars to finding a cab, even preventing us missing our bus or train stop when oversleeping whilst on one. Global Positioning System (GPS) being the culmination of research in this area, and the technology of choice for outdoor location based systems today. Since then there have been significant inroads made in the development of Indoor Positioning Systems that attempt to mirror the success of its outdoor big brother equivalent. There are however some obvious barriers that currently stifle this aspiration, primarily the topography of an indoor location with its many walls, doors, pillars, ceilings and floors, distorting the signals to\from mobile devices and their tracking devices. The characteristically noisy behaviour of wireless channels, Bluetooth devices, cordless phones, microwaves etc. can cause interference as they all operate in the same band as Wi-Fi devices, namely 2.4 GHz, while water and human bodies absorb RF signals at that frequency. Furthermore the limited range of tracking devices such as Wireless Access Points (APs), and the restrictions surrounding their positioning within a building further exacerbate this issue. This paper advocates a solution to some of these issues, proposing a method to extend the range of Indoor Location Based Systems using Mobile Devices at the extremities of Cells who ‘know’ their location, to determine the location of devices beyond the Cell range of the AP.
|Title of host publication||Unknown Host Publication|
|Place of Publication||Liverpool, UK|
|Number of pages||5|
|Publication status||Published - Jun 2012|
|Event||13th Annual Post-Graduate Symposium on the Convergence of Telecommunications Networking & Broadcasting (PGNet 2012 - Liverpool, United Kigndom|
Duration: 1 Jun 2012 → …
|Conference||13th Annual Post-Graduate Symposium on the Convergence of Telecommunications Networking & Broadcasting (PGNet 2012|
|Period||1/06/12 → …|
Bibliographical noteReference text:  M. Weiser, “The computer for the 21st century,” Scientific American, vol. 265, no. 3, pp. 94–104, 1991.
 E. Kaasinen, “User Needs for Location-Aware Mobile Services,” Personal and Ubiquitous Computing, Vol.7 No.1, pp.70-79, 2003.
 J. Pascoe, N. Ryan, and D. Morse, “Issues in developing context-aware computing,” First International Symp. on Handheld and Ubiquitous Computing (HUC 99), vol. 1707, pp. 208-221, 1999.
 A. K. Dey, and G. D. Abowd, “Towards a better understanding of context and context-awareness,” Georgia Institute of Technology., Atlanta, Georgia, Tech. Rep. Atlanta, Georgia, Tech. Rep. GITGVU pp. 99-22, 1999.
 B. Schilit, N. Adams, R. Want, "Context-aware computing applications," in Mobile Computing Systems and Applications, 1994. Proc., Workshop on , vol., no., pp.85-90, 8-9 Dec 1994.
 R. Want, A. Hopper, "Active badges and personal interactive computing objects," Consumer Electronics, IEEE Transactions on , vol.38, no.1, pp.10-20, Feb 1992.
 G. Chen and D. Kotz, “A Survey of Context-Aware Mobile Computing Research TR2000-381,” Dept. of Computer Science, Dartmouth College, Dartmouth, November 2000.
 G. Marsden, and M. Jones, 2006. Mobile Interaction Design. John Wiley & Sons, January 2006.
 F. Yang; D. Aoshuang, "A Solution of Ubiquitous Location Based on GPS and Wi-Fi ULGW," in Hybrid Intelligent Systems, 2009. HIS '09. Ninth International Conference on , vol.2, no., pp.260-263, 12-14 Aug. 2009.
 A. Rowe, Z. Starr, and R. Rajkumar, "Using micro-climate sensing to enhance RF localization in assisted living environments," Systems, Man and Cybernetics, 2007. ISIC. IEEE International Conference on , vol., no., pp.3668-3675, 7-10 Oct. 2007.
 G.M. Djuknic, and R.E. Richton, "Geolocation and assisted GPS," Computer , vol.34, no.2, pp.123-125, Feb 2001.
 K. Venkatraman, B. Amutha, K.T. Karthick, and S.R. Sankar, "A hybrid method for improving GPS accuracy for land vehicle navigation system," Emerging Trends in Robotics and Communication Technologies (INTERACT), 2010 International Conference on , vol., no., pp.74-79, 3-5 Dec. 2010.
 National Coordination Office for Space-Based Positioning, Navigation (NAVCEN), and Timing and the Civil GPS Service Interface Committee., "Augmentation Systems," Coast Guard Navigation Center, 15 March 2012. [Online]. Available: http://www.gps.gov/systems/augmentations/. [Accessed 11 April 2012].
 National Coordination Office for Space-Based Positioning, Navigation, and Timing (PNT). The U.S. Coast Guard Navigation Centre., "U.S. DEPARTMENT OF TRANSPORTATION," U.S. Department of Homeland Security, 2012 March 15. [Online]. Available: http://www.navcen.uscg.gov/?pageName=ndgpsMain. [Accessed 11 April 2012].
 Federal Aviation Administration (FAA), "Navigation Services - Wide Area Augmentation System (WAAS)," Federal Aviation Administration (FAA), [Online]. Available: http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/. [Accessed 11 April 2012].
 M. Quinlan, "Galileo - A european global satellite navigation system," New Developments and Opportunities in Global Navigation Satellite Systems, 2005. The IEE Seminar on (Ref. No. 2005/10810) , vol., no., pp.0_9-1/16, 24-24 March 2005.
 Z. Yang, Z. Sun, L. Jiang, and Y. Xie, H. Kishida, "An area zoning based WLAN location system," Wireless Mobile and Computing (CCWMC 2009), IET International Communication Conference on , vol., no., pp.437-440, 7-9 Dec. 2009.
 J.R. Guerrieri, M.H. Francis, P.F. Wilson, and T. Kos, L.E. Miller, N.P. Bryner, "RFID-assisted indoor localization and communication for first responders," Antennas and Propagation, 2006. EuCAP 2006. First European Conference on , vol., no., pp.1-6, 6-10 Nov. 2006.
 Ekahau , "Ekahau Real Time Location System (RTLS) Overview," Ekahau , [Online]. Available: http://www.ekahau.com/products/realtime-location-system/overview.html. [Accessed 02 November 2011].
 C. Y. Shih, and P.J. Marr n, COLA: Complexity-Reduced Trilateration Approach for 3D Localization in Wireless Sensor Networks," in Sensor Technologies and Applications (SENSORCOMM), 2010 Fourth International Conference on , vol., no., pp.24-32, 18-25 July 2010.
 S. Capkun, M. Hamdi, and J. P. Hubaux, "GPS-free positioning in mobile ad-hoc networks," System Sciences, 2001. Proceedings of the 34th Annual Hawaii International Conference on , vol., no., pp. 10 pp., 3-6 Jan. 2001.
 Y. Shen, H. Wymeersch, and M.Z. Win, "Fundamental Limits of Wideband Cooperative Localization via Fisher Information," Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE , vol., no., pp.3951-3955, 11-15 March 2007.
 L. Joon-Yong, and R.A. Scholtz, "Ranging in a dense multipath environment using an UWB radio link," Selected Areas in Communications, IEEE Journal on , vol.20, no.9, pp. 1677- 1683, Dec 2002.
 M.Z. Win, and R.A. Scholtz, "On the robustness of ultra-wide bandwidth signals in dense multipath environments," Communications Letters, IEEE , vol.2, no.2, pp.51-53, Feb. 1998.
 M.Z. Win, and R.A. Scholtz, "Characterization of ultra-wide bandwidth wireless indoor channels: a communication-theoretic view," Selected Areas in Communications, IEEE Journal on , vol.20, no.9, pp. 1613-1627, Dec 2002.
 S. Gezici, T. Zhi, G.B. Giannakos, and H. Kobayashi, A.F. Molisch, H.V. Poor, "Localization via ultra-wideband radios: a look at positioning aspects for future sensor networks," Signal Processing Magazine, IEEE , vol.22, no.4, pp. 70- 84, July 2005.
 J.C. Chan, and D. B. Hoang, "Service architecture for integrating MANETs with heterogeneous IP networks," Wireless Communications and Networking Conference, 2005 IEEE , vol.4, no., pp. 2270- 2275 Vol. 4, 13-17 March 2005.