Performance of 3GPP Rel-9 LTE Positioning Methods

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Performance of 3GPP Rel-9 LTE Positioning Methods

  1. 1. 2nd Opportunistic RF Localization forNext Generation Wireless DevicesJune 13-14, 2010Worcester Polytechnic InstituteWorcester, MA, USA Performance of 3GPP Rel-9 LTE positioning methods 2nd Invitational Workshop on Opportunistic RF Localization for Next Generation Wireless Devices June 13 - 14, 2010 Karri Ranta-aho Senior Specialist, Radio Standardization Nokia Siemens Networks 1 © Nokia Siemens Networks Nokia Siemens Networks Your Network Partner Global Leadership • The #2 network infrastructure provider in the world • 60,000 employees in 150 countries, including 28,000 service professionals North America Market Strength • Connecting 100M+ Mobile Subscribers • Serving more than 600 customers and 18M+ Fixed Subscribers supplier to 75 of Top 100 communication service providers • Serving 150+ Customers • Supplying 8 of the Top 10 operators • More than 1.5 billion connections served, • 3,000+ employees in 25 offices including over half the world’s throughout the U.S. and Canada WCDMA/HSPA mobile subscribers 1
  2. 2. 2nd Opportunistic RF Localization forNext Generation Wireless DevicesJune 13-14, 2010Worcester Polytechnic InstituteWorcester, MA, USA 3GPP Location Standards Evolution An Overview Release 99 Release 4 Release 5 Release 6 Release 7 CS Domain PS Domain Enhanced Privacy Profile LCS for I-WLAN Subscriber Register, including reference A-GPS to OMA SUPL, A- (Phase1) Privacy inter-GMLC Lr GNSS (Galileo) interface 2000 2001 2002 2005 2007 LTE from Release 8 Release 9 Release 10 Rel-8 A-GNSS Control Plane LCS TBD onwards [GLONASS & in EPS (Evolved A-GPS (Phase II), Packet System) QZSS] March 2009 March 2010 Est. March 2011 3GPP Release 9 introduced LTE control plane signalling support for LCS Soc Classification level 3 © Nokia Siemens Networks LTE Positioning Methods- overview 3GPP Release 9 Must get GPS fix Assisted Satellite positioning (A-GPS, etc) from 4 satellites Primary • Network can provide assistance data for faster/more reliable fix Neighbor cells Cell ID based positioning + Enhancements enhance accuracy • Server knows the geographical locations of the cells Fallback • Timing Advance can be used to find the UE’s distance from the eNB antenna • Neighbor cell measurements etc. can be used to increase the accuracy UE must detect OTDOA (Observed Time Difference of Arrival) signal of 3 eNBs • UE location can be tri-laterated with the knowledge of three or more eNB’s Fallback –Transmit timings of the cells in the system and their geographical locations –Received time difference of at least two other cells vs. serving cell in the UE A-GPS considered the primary positioning technique in LTE Other techniques used when GPS fix not available Soc Classification level 4 © Nokia Siemens Networks 2
  3. 3. 2nd Opportunistic RF Localization forNext Generation Wireless DevicesJune 13-14, 2010Worcester Polytechnic InstituteWorcester, MA, USA LTE Positioning Methods A-GNSS Provides assistance data for faster/more reliable GPS fix • The server asks the UE locate itself • Provides also satellite assistance data to aid detection • Satellite based positioning is radio system agnostic E-SMLC • LTE just provides a connection between Provides GPS location Serving eNB the UE and the server 3 Detected neigbors and their relative signal levels approximate where in the arch the UE is Enhanced Cell ID Neighbor Neighbor eNB eNB • The UE reports d • The serving cell’s Cell ID 2 Estimates the UE Timing Advance gives the location based on the • The radio link Timing Advance UE’s approximate distance D measurement reports from the serving eNB • Detected neighbor cells and Rx levels • Server approximates the UE location 1 Cell ID locates the UE to the cell size and shape E-SMLC Serving eNB Provides neighbor OTDOA cell information and triangulates the UE • The server provides the UE with a list of T2 location T3 Cell 2 potential neighbors cells to search Cell 3 T1 • The UE measures and reports OTDOA Measures OTDOA of each neighbor for detected neighbor cells relative to the serving cell Serving eNB E-SMLC • Detection of at least two neighbor eNBs Soc Classification level in addition to the serving eNB required 5 © Nokia Siemens Networks Accuracy expectations of the LTE positioning techniques 95% <150m Availability 67% <50m remote Satellite rural positioning sub- A-GNSS Cell ID A urban DO based methods OT city GLONASS/GALILEO Hybridization /E-CID in-door WiFi Accuracy 1m 3 10 50 100 300 1km 3km 10km Primary Location Determination method Supplementary Location Determination method Soc Classification level 6 © Nokia Siemens Networks 3
  4. 4. 2nd Opportunistic RF Localization forNext Generation Wireless DevicesJune 13-14, 2010Worcester Polytechnic InstituteWorcester, MA, USA Positioning accuracy Performance of the fall-back methods, city environment 3 or more The A-GPS performance is sites detected; compromised in urban/indoor OTDOA works • 3 sites detected environments ~70% of cases; • WLAN a good fall-back technique OTDOA works for indoors case, not used in this Less than 3 sites slide. detected; The performance of the OTDOA fails, fallback methods heavily E-Cell-ID used. depending on the deployment • Cell sizes • Deployment of OTDOA • Usage of OTDOA hearability aids A-GPS Fallback Combined Assume • 67% probability for GPS fix P(50m) 54% 73% 78% • 80% probability for GPS location error < 50m P(150m) 67% 85% 95% • 100% probability for GPS position error < 150m Soc Classification level 7 © Nokia Siemens Networks Summary • 3GPP Release 9 standardized positioning techniques for LTE • A-GNSS (A-GPS) as the primary method • Enhanced Cell-ID and OTDOA as fall-back methods • A-GPS performance very good when GPS fix successful • Urban/Indoor challenging for A-GPS • Fall-back techniques’ performance heavily deployment dependent • Cell sizes • Usage of OTDOA and its hearabilty enhancements • Base station accuracy (antenna locations, transmit timings) • WLAN a good candidate for enhanced indoor positioning performance Soc Classification level 8 © Nokia Siemens Networks 4
  5. 5. 2nd Opportunistic RF Localization forNext Generation Wireless DevicesJune 13-14, 2010Worcester Polytechnic InstituteWorcester, MA, USA Thank You! Questions ? 9 © Nokia Siemens Networks 5

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