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E-CID Location Accuracy Analysis April 2013

E-CID Location Accuracy Analysis April 2013. GSM TA + NMR Positioning. Neighboring Cell Area. TA Arc. Serving Cell Area. Neighboring Cell Area. Estimated Arc Area. Accuracy depends on serving cell type a nd size, number of neighbours and their arrangement, etc. UMTS - RTT Positioning.

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E-CID Location Accuracy Analysis April 2013

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  1. E-CID Location Accuracy Analysis April 2013

  2. GSM TA + NMR Positioning Neighboring Cell Area TA Arc Serving Cell Area Neighboring Cell Area Estimated Arc Area Accuracy depends on serving cell type and size, number of neighbours and their arrangement, etc

  3. UMTS - RTT Positioning Sector Cell Serving Cell Area RTT Arc Sector Cell RTT Arc Serving Cell Area Omni-Cell Serving Cell Area Accuracy depends on serving cell type and size, number of neighbours and their arrangement, etc

  4. TA Arc LTE – CID + TA + Signal Power Positioning Neighboring Cell Area Serving Cell Area Neighboring Cell Area Estimated Arc Area Accurate from ~200m arc width with arc depth: 120m+, if terminal > ~19.5 Km from cell antenna 45m-90m, if terminal <=~19.5 Km from cell antenna Arc width depends on serving cell type and size, number of neighbours and their arrangement

  5. LTE – TA + AoA Positioning • Approximate arc depth: • 120m+, if terminal > ~19.5 Km from cell antenna • 45m-90m, if terminal <=~19.5 Km from cell antenna • Antenna angular resolution is up to 0.5 degrees, so with actual angular resolution of ~3 times best resolution (assumption) then arc width will be: • 780m at 30 Km from cell antenna • 390m at 15 Km from cell antenna • 39m at 1.5 Km from cell antenna(in practice, NLOS ~160m) Sector Cell Serving Cell Area Estimated Elliptical or Arc Area AoA position vector with vector error Estimated TA Arc

  6. Factors Impacting the AccuracyOverview • Cell Size (Cell Density) • Very strong correlation between cell size and accuracy • Quality of Cell Input Data, e.g. • Correctness of cell tower coordinates • Correctness of cell azimuth data • Location Method Used • Enhanced CGI significantly better than CGI only • (A-GPS significantly better than E-CGI, but dependency to coverage and terminal support) • 3G more accurate than 2G (for the same cell size) • Accuracy of the RTT value: taken to be approximately +/- 60 meters • Accuracy of the TA value: taken to be ~550m

  7. 2G vs 3G (Enhanced CGI)Accuracy of TA and RTT (assuming same cell size!) TA ~550m RTT ~120m

  8. Location Method vs Accuracy Enhanced Cell-ID Cell ID Only

  9. Location Method vs Accuracy LTE OTDOA (UE Dependant)

  10. Location Method vs AccuracyA-GPS Location (GSM, UMTS, LTE) A-GPS Location (GSM, UMTS, LTE) (UE Dependant)

  11. 2G & 3G Drive Test Centre of MLC Location Estimate Error (m) Distance to BTS (m) GPS Logger& Test Phones

  12. 2G & 3G Drive Test Results

  13. Pros and Cons of E-CID • No terminal dependency • Medium accuracy, better than CGI-only • Works indoor and out • Works in urban canyons • Accuracy still low in rural areas – significantly less than A-GPS or OTDOA • High dependency on Operator network data

  14. Thank You! Dr Paul Martlew VP, Channel Sales Mobile Arts AB Tel: +44 121 2880851 Mob: +44 7799 640190 Skype:paulmartlew Web:www.mobilearts.com

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