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Dr. Rob Stafford Project Engineer – NTIA/ITS PS Broadband Project

Public Safety Communications Research Department of Commerce – Boulder Labs. PSCR Update. Dr. Rob Stafford Project Engineer – NTIA/ITS PS Broadband Project. Outline. PSCR Testing – Phase 1 Application Testing Interference Into eNodeB Sector Characterization Test The Move to 10 MHz

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Dr. Rob Stafford Project Engineer – NTIA/ITS PS Broadband Project

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  1. Public Safety Communications Research Department of Commerce – Boulder Labs PSCR Update Dr. Rob Stafford Project Engineer – NTIA/ITSPS Broadband Project

  2. Outline • PSCR Testing – Phase 1 • Application Testing • Interference Into eNodeB • Sector Characterization Test • The Move to 10 MHz • C-Block/D-Block Interference • PSNB Interference • Other Issues • What’s Next

  3. Public Safety Communications Research Program Located at the Department of Commerce Boulder Labs in Colorado The PSCR Program is a joint effort between: NIST’s Office of Law Enforcement Standards (OLES) and NTIA’s Institute for Telecommunication Sciences (ITS)

  4. PSCR Sponsors Department of Homeland Security Office for Interoperability and Compatibility Department of Justice Office of Community Oriented Policing Services

  5. LTE Architecture RAN = Radio Access Network Ue’s eNodeB’s EPC = Evolved Packet Core Internet

  6. eNodeB Antennas

  7. eNBs

  8. eNBs

  9. Cell on Wheels (COW)

  10. Microwave Link

  11. Testing

  12. Phase One

  13. The Phase One Tests • eNodeB Receiver/Transmitter Tests (4) • Interference Immunity • Out-of-Band Emissions • Messaging/Protocol Tests (3) • Attach, Detach, IP Connectivity • Applications Tests (9) • Various applications • Sector Characterization Test (1) • Radiated, Real World Environment

  14. Applications Tests • Web Browser • File Transfer (Up/Down) • Email • VPN • Voice (Mobile Originate/Terminate) • Instant Message • Database

  15. Adjacent Band Interference Into the eNB

  16. Typical Test Result

  17. Measured Signal Spectrum

  18. 3GPP Test Setup BS under TX test Measurement equipment TX

  19. PSCR Test Setup

  20. eNodeB Transmitter Testing • We use a test waveform (E-TM1.1, E-TM1.2) if possible, or a 64 QAM modulated waveform if test waveforms are unavailable • We test in-band channel power, out-of-band power (edge frequency +/- 10 MHz), and spurious emissions (> 10 MHz offset) • Tests use 100 kHZ measurement bandwidth • Co-existence and Co-location specifications

  21. eNb 5 MHz Spectral Emissions Mask

  22. eNB Spectral Emissions Limits

  23. In-Band/Out-of-Band Emissions

  24. In-Band Failure

  25. Sector Characterization Test • This test is designed to determine the throughput at near, mid, and cell edge locations. The near, mid and cell edge locations will be determined at the 10th, 50th and 95th percentiles of the CDF of the SNR. This test will be conducted between a loaded and unloaded, single sector of an eNB and a nomadic UE in the presence of co-channel interference.

  26. Public Safety Broadband Demo Network

  27. Drive Test Route

  28. Typical Throughput versus SNR

  29. Near, Mid and Far Cell Locations

  30. Downlink, Network Unloaded

  31. Downlink , Network Loaded

  32. Downlink Comparison

  33. Uplink, Network Unloaded

  34. Uplink, Network Loaded

  35. 700 MHz 3GPP Spectrum Public Safety Broadband Spectrum is dedicated by Congress and can only be used by PS D Block was legislated by Congress for commercial Use and was never dedicated to PS Public Safety Broadband PS Narrowband D Block D Block Ch 51 Upper Band Lower Band ? ? Public Safety Public Safety Cavalier Wireless Cavalier Wireless 2

  36. 10 MHz eNB Spectral Emission Mask

  37. 10 MHz Test

  38. The D-Block Experiment • Band 13 signal within FCC limits • Simulation: User is close to Band 13 site, far from PSBB site • User is about 8 km from PS site, 300 m from Band 13 site in this experiment

  39. D Block Radiated Signal (1)

  40. D Block Radiated Signal (2)

  41. Map of Band 13 Signal Level

  42. Effect of D-Block Interference

  43. PSNB Testing

  44. Our “Dispatch”

  45. Radios & Test Equipment

  46. Other Interferers! • PSBB uplink = 788 to 798 MHz • GPS L1 = 1575.42 MHz • 2*788 MHz = 1576 MHz! • Leakage from cable TV repeaters • Wireless microphones

  47. What Is Next? • 10 MHz Regression Results • Phase 3 • Being modified to heavily address interoperability (IOT) • The New Legislation • http://www.ntia.doc.gov/files/ntia/publications/ ntia_public_safety_communications_slidedeck .pdf

  48. Generic PSCR Network Diagram

  49. New Mobiles

  50. For Additional Information: http://www.pscr.gov Dr. Rob Stafford stafford@its.bldrdoc.gov

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