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

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) VPN Voice (Mobile Originate/Terminate) Instant Message Database

15 Adjacent Band Interference Into the eNB BandFrequency Center Frequency Modulation C Block UL MHz782 MHzLTE SC-FDMA C Block DL MHz751 MHzLTE OFDMA PS Narrowband UL MHz799 MHzP25 C4FM test pattern PS Narrowband DL MHz769 MHzP25 C4FM test pattern

16 Typical Test Result

17 Measured Signal Spectrum

18 3GPP Test Setup Measurement equipment BS under TX test 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 DL Frequency Bands DL Frequency Range (MHz) Power Level (dBm/100 kHz) 3GPP TS version Reference In Band Pmax Clause Out-of-Band Lower Lower Lower Upper Upper to to Table FCC rule Table Table Spurious Co-location Lower Upper Table with Note 1 Tables and Spurious Co-existence Lower Upper Upper Table with Note 1 Table Table

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 10 th, 50 th and 95 th 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

MHz 3GPP Spectrum Lower Band Upper Band Cavalier Wireless ?? Public Safety Ch 51 D Block Public Safety Broadband PS Narrowband 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 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 = 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 – ntia_public_safety_communications_slidedeck.pdf

48 Generic PSCR Network Diagram

49 New Mobiles

50 For Additional Information: Dr. Rob Stafford