Content for TR 45.811 Word version: 6.0.0
4 U-TDOA: System Description
5 U-TDOA: Performance Analysis
6 U-TDOA: System Impacts
7 U-TDOA Call Flows
8 Implementation Considerations
9 U-TDOA Advantages and Disadvantages
10 Conclusion
A Analysis of GSM and GPRS Uplink Time Difference of Arrival (U-TDOA)
B Functional Description of Predictive Model
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4 U-TDOA: System Description Word‑p. 7
5 U-TDOA: Performance Analysis Word‑p. 9
5.1 Introduction
5.2 Review of the Fundamental Drivers of Location Accuracy
5.3 Comparison of GSM Versus IS-136 TDMA
5.4 Modelling Methodology Word‑p. 10
5.5 Conclusion Word‑p. 11
6 U-TDOA: System Impacts
6.1 Protocol Impacts
6.2 Impacts to Existing Nodes Word‑p. 13
6.3 Network Capacity Impacts Word‑p. 14
6.3.1 Network Assumptions
6.3.2 Um and Abis Interfaces Word‑p. 15
6.3.3 Lb Interface
6.3.4 Gb Interface Word‑p. 18
6.3.5 MS Power Consumption
6.4 Impact on Specifications
7 U-TDOA Call Flows Word‑p. 20
7.1 Packet Switched
7.1.1 General Location Procedure
7.1.2 PS U-TDOA, Packet Idle Mode Word‑p. 21
7.1.3 PS U-TDOA, Ready State, Uplink data transfer in progress Word‑p. 22
7.2 Circuit Switched Word‑p. 23
7.2.1 CS, Idle Mode
7.2.2 CS, Dedicated Mode Word‑p. 24
8 Implementation Considerations Word‑p. 25
8.1 Physical Implementation of the LMU
8.2 Latency
8.3 Synchronization Word‑p. 26
8.4 Location Determination Capacity
8.5 MS Power Control
8.6 Operation with Repeaters
8.7 Privacy Word‑p. 27
9 U-TDOA Advantages and Disadvantages Word‑p. 28
9.1 Advantages of U-TDOA
9.1.1 Excellent Performance in Urban and Indoor Environments
9.1.2 Support for Legacy Mobile Stations
9.1.3 Scalable Accuracy
9.1.4 Support for Roaming Subscribers
9.1.5 Efficient Use of RF Resources
9.1.6 Protection from Obsolescence
9.1.7 Proven Technology Word‑p. 29
9.2 Disadvantages of U-TDOA
10 Conclusion
A Analysis of GSM and GPRS Uplink Time Difference of Arrival (U-TDOA) Word‑p. 30
A.1 Introduction
A.2 Review of the Fundamental Drivers of Location Accuracy
A.3 Comparison of GSM Versus TDMA Word‑p. 31
A.4 Comparison of U-TDOA and E-OTD Performance Word‑p. 62
A.4.1 Location Accuracy
A.4.2 SNR and Integration Time
A.4.3 Signal Bandwidth
A.4.4 Super-resolution Word‑p. 64
A.4.5 Timing Stability of the Receiver
A.4.6 Number of Measurements
A.4.7 Geometry
A.5 Conclusion Word‑p. 66
B Functional Description of Predictive Model Word‑p. 68
B.1 Calculation of rms error weighted HDOP Word‑p. 69
B.2 The HDOP Calculation
B.3 Calculation of partial derivatives Word‑p. 70
$ Change history Word‑p. 72
