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Introduction to LBS

Introduction to LBS. Fall 2004 CS644 Advanced Topics in Networking Sue B. Moon Division of Computer Science Dept. of EECS KAIST. Location Based Services. Services that integrate a mobile device's location or position with other information so as to provide added value to a user. Taxonomy.

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Introduction to LBS

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  1. Introduction to LBS Fall 2004 CS644 Advanced Topics in Networking Sue B. Moon Division of Computer Science Dept. of EECS KAIST

  2. Location Based Services • Services that integrate a mobile device's location or position with other information so as to provide added value to a user

  3. Taxonomy • Person-oriented • e.g. friend finder • M-commerce • Device-oriented • e.g. car tracking for theft recovery • Push services • e.g. subscription-based service • Pull services • e.g. where to find the nearest cinema?

  4. Location Determination Technologies • Network-based • Cell-ID trace mechanism • 단점: • Accuracy: up to 2km urban, 30km rural • CI-TA (Cell-ID with Time Advance) • Calculate delay between handset and base station • AOA (Angle of Arrival) • Use multiple antennas at base station • Triangulation of location based on angles of signal reception • TDOA (Time Difference Of Arrival) • Exploit relative difference between two base stations

  5. Location Determination Technologies • Handset-based • GPS (Global Positioning System) • Need a view of 3 satellites out of 24 of US Gov't • 단점: • Long Time-to-First-Fix (TTFF) • Hybrid • GPS-DR (Dead reckoning) • Wireless-Assisted GPS (WAG)

  6. General LBS Comm Model Application GIS Middleware Layer Positioning Layer

  7. OSFi (Open Srouce Gateway Initiative)Java-based S/W Architecture Application Application Application OSGi Core and Optional Services Device Mgr, HTTP service, User Admin, etc. OSGi Framework Core APIs for applications to share JavaVM: life cycle mgmt, security, Native Code VR, TTS Java 2 Micro Edition (JVM) S/W Platform Real-Time OS Network Drivers TCP/IP, 802, Bluetooth, etc. Hardward Platform

  8. AMI-C(Automotive Multimedia Interface Collaboration) Car Navitaion Contents Internet Theft Prevention Standard Platform API S/W Platform Standard Middleware OS H/W Platform Standard Hardware Audio Other Device

  9. Telematics • Telematics = telecommunication + informatics

  10. References • "Location-Based Services" by Jochen Schiller and Agnes Voisard, Morgan Kaufmann • 텔레매틱스 개론 by 송준화 외 다수, 홍릉과학출판사

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