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

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 Public Safety Communications Research ProgramResearch Program

Located at the Department of

CommerceBoulder Labs in

Colorado

The PSCR Program is a joint effort between:

NIST’s

Office of LawEnforcement Standards

(OLES) and

NTIA’sInstitute for

TelecommunicationSciences

(ITS)

4

PSCR SponsorsPSCR SponsorsPSCR SponsorsPSCR Sponsors

Department of Homeland Security

Office for Interoperability and Compatibility

Department of Justice

Office of Community Oriented Policing Services

5

LTE Architecture

eNB

eNB

HSSHome Subscriber Server

MMEMobility Management Entity

SGWServing Gateway

PGWPDN Gateway

eNB

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

Public Safety Communications Research

LTE Demonstration Network Test Plan

Phase 1: Basic Functionality Tests

Version 1.22

September 12, 2011

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

Band Frequency Center Frequency

Modulation

C Block UL 777 - 787 MHz 782 MHz LTE SC-FDMA

C Block DL 746 - 756 MHz 751 MHz LTE OFDMA

PS Narrowband UL 799 - 805 MHz 799 MHz P25 C4FM +1011 test pattern

PS Narrowband DL 769 - 775 MHz 769 MHz P25 C4FM +1011 test pattern

16

Typical Test Result

17

Measured Signal Spectrum

18

3GPP Test Setup

Measurement equipmentBS under TX test

TX

19

PSCR Test Setup

UE

TXRX 1

RX 2

eNB

TX 1RX 1

TX 2RX 2

2

1 40 dB Attn

40 dB Attn

50 ohm

11

2

1 1

22

50 ohm

Splitter

Spectrum Analyzer

RX 1

50 ohm

50 ohm

Spectrum Analyzer

RX 2

Interference Signal Generator

C, D or LMR Bands Spectrum Analyzer: Agilent MXA 9020AInterference Sig Gen: R&S SMU200ABi-directional coupler: Anatech AM1515DC860Circulator: Ditom D3C0780Splitter/Combiner: AEI AM505PD1018-N

2

Combiner

Combiner

30 dB Tap

30 dB Tap

Bi-dir coupler

30 dB Tap

30 dB Tap

Bi-dir coupler

Bas

e S

tatio

n

Mob

ile

Sta

tion

To IN

From OUT

Spirent RFI

SR5500Channel

Sim 1

To IN

From OUT

SR5500Channel

Sim 2

1 1

2 2

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

In Band and Out of Band748-777

Spurious777-798

Spurious728-748

22

eNB Spectral Emissions Limits

DL Frequency Bands

DL Frequency Range (MHz)

Power Level (dBm/100 kHz)

3GPP TS 36.104 version 8.8.0 Reference

In Band 758-768 Pmax Clause 6.2.1

Out-of-Band

748-753 Lower

753-753.7 Lower

753.7-758 Lower

768-769 Upper

769-777 Upper

-14

-14 to -13

-13

-7 to -8.4

-34

Table 6.6.3.1-3

Table 6.6.3.1-3

FCC rule 27.53

Table 6.6.3.1-3

Table 6.6.4.3.1-3Spurious

Co-location

728-748 Lower

777-798 Upper

-62

-96

Table 6.6.4.3.1-1 with Note 1

Tables 6.6.4.2-1 and 6.6.4.4.1-1

Spurious

Co-existence

728-748 Lower

777-788 Upper

788-798 Upper

-62

-59

-96

Table 6.6.4.3.1-1 with Note 1

Table 6.6.4.3.1-1

Table 6.6.4.2-1

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 Public Safety

Ch52

Ch55

Ch56

Ch57

Ch58

Ch59

Ch60

Ch61

Ch62

Ch63

Ch64

Ch65

Ch66

Ch67

Ch68

Ch69

Ch54

Ch53

C CD DPSBB

PS NB

PS NB

PSBB

CBAEDCBA A AB BGB

GB

698 716 722 728 734 740 746 752 758 764 770 776 782 788 794 800 806710704

757 763 769768 775 787 793 799798 805

Ch52

Ch55

Ch56

Ch57

Ch58

Ch59

Ch60

Ch61

Ch62

Ch63

Ch64

Ch65

Ch66

Ch67

Ch68

Ch54

Ch53

C CD DPSBB

PS NB

PS NB

PSBB

CBAEDCBA A ABGB

GB

698 716 722 728 734 740 746 752 758 764 770 776 782 788 794 800710704

757 763 769768 775 787 793 799798

746

Lower Band Upper Band

Cavalier Wireless

Cavalier Wireless

? ?Public Safety

Public Safety

Ch 51

D Block 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 = 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/public

ations/ ntia_public_safety_communications_slidedeck .pdf

48

Generic PSCR Network Diagram

49

New Mobiles

50

For Additional Information:http://www.pscr.gov

Dr. Rob [email protected]