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Implementing Location-Based Services: An Approach to “Life in Motion, Connected”

This dissertation presents a detailed examination of implementing Location-Based Services (LBS), focusing on the Unifind project. It addresses key components such as network architecture, positioning methods, and the interaction between user interface design and system architecture. The document explores the evolution of LBS, significant trends, and current project findings, while discussing potential trade-offs involving cost, accuracy, and power consumption. By analyzing market outlooks and related projects, this work lays foundational insights for future research in LBS.

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Implementing Location-Based Services: An Approach to “Life in Motion, Connected”

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  1. Lynn Li Tele480 Final Year Dissertation 11 Oct 2006 Location Based Service- an implementation approach “Life in motion, connected.”

  2. Outline • Introduction - Aims & Purpose - Localization - LBS Software • Related Projects - Current Situation - Trends • Implementation – Unifind - Project Description - Project Design - Project Architecture - User Interface - Analysis

  3. Outline – cont. • Implementation – Unifind - Notes & Comments • Findings & Discussions - Description of Findings - Market outlook - Conclusion • Questions and Feedbacks

  4. Introduction • Aims & Purposes - LBS Components - Trade-offs - starting ground for future research • Localization - Network Architecture - Positioning Methods

  5. Introduction – Network Architecture • Location Service Client (LSC) • Gateway Mobile Location Centre (GMLC) • Location Measurement Unit (LMU) • Serving Mobile Location Center (SMLC)

  6. Introduction – Positioning Methods • Cell Identification - parameter in SIM &GSM - accuracy: 100m – 5km • Enhanced Cell Identification - accuracy: 550m (rural) • Time of Arrival (ToA) - three or more LUMs • Angle of Arrival (AoA) • Enhanced Observed Time Difference (E-OTD) - Handset measures itself - accuracy: 50m – 200m,

  7. Introduction – Positioning Methods • Global Positioning System (GPS) - accuracy: - performance • Assisted GPS (A-GPS) - improved performance • Differential GPS (D-GPS) - improved accuracy • Cell Broadcast - also known as SMS–CB - SMS VS SMS-CB

  8. Introduction – LBS Software • LBS Software Checks - mechanism support - accuracy requirements • Service Models - push - pull • Location API

  9. Related Projects • Telia Mobile/Teliasonera: • Yellow Pages near you • BotFighters • AT&T/Cingular • Find Friends • Others • “push” services in China • Trends - Increased accuracy - Increased consistency - reduced cost

  10. Implementation – Unifind • Project Description - user - requirements - assumptions - service • Project Design - use case diagram - positioning criteria • Integrated GPS (Bjorn Wells) • Accuracy, Frequency • Loss of GPS signal

  11. Implementation – Design • Use case Diagram

  12. Implementation – Archietecture • Project Archietecture - Pull model • User request • MIDlet starts • Location Provider • Create & Register Listeners • User Interface • Landmark store management - Class Diagram

  13. Implementation – Architecture • Class Diagram

  14. Implementation – UI • User Interface flow

  15. Implementation – Analysis 1) • Sequence Diagram (start up)

  16. Implementation – Analysis 1) cont • Analysis - ProviderFound() • UIgeneral: updateWaiting()

  17. Implementation – Analysis 2) • Sequence Diagram

  18. Implementation – Analysis 2) cont • Analysis - FirstUpdateEvent() • UniMIDlet calls UniUI(uniData) • Screen is updated according to locationUpdated(…) & monitoringStateChanged() events from LocationListener & ProximityListener

  19. Implementation – Notes & Commets • Notes - Technique notes - Map View • UI consistency • Map segmentation • Power consumption • Comments - GPS vs AGPS - Security - Future work

  20. Findings & Disscussions • Findings - Trade-offs • Cost, power, accuracy… - API usage - Across platforms • Market outlook - Mapping, navigation - Workforce-tracking - Entertainment …. • Conclusion

  21. Lynn Li Tele480 Final Year Dissertation 11 Oct 2006 Thanks so, questions and feedbacks… “Life in motion, connected.”

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