1 public safety communications research department of commerce – boulder labs pscr update dr. rob...
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Public Safety Communications Research
Department of Commerce – Boulder Labs
PSCR Update
Dr. Rob Stafford Project Engineer – NTIA/ITS
PS Broadband Project
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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
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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)
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PSCR SponsorsPSCR SponsorsPSCR SponsorsPSCR Sponsors
Department of Homeland Security
Office for Interoperability and Compatibility
Department of Justice
Office of Community Oriented Policing Services
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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
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eNodeB Antennas
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eNBs
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eNBs
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Cell on Wheels (COW)
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Microwave Link
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Testing
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Phase One
Public Safety Communications Research
LTE Demonstration Network Test Plan
Phase 1: Basic Functionality Tests
Version 1.22
September 12, 2011
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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
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Applications Tests
• Web Browser• File Transfer (Up/Down)• Email• VPN• Voice (Mobile Originate/Terminate)• Instant Message• Database
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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
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Typical Test Result
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Measured Signal Spectrum
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3GPP Test Setup
Measurement equipmentBS under TX test
TX
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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
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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
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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
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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
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eNb 5 MHz Spectral Emissions Mask
In Band and Out of Band748-777
Spurious777-798
Spurious728-748
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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
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In-Band/Out-of-Band Emissions
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In-Band Failure
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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.
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Public Safety Broadband Demo Network
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Drive Test Route
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Typical Throughput versus SNR
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Near, Mid and Far Cell Locations
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Downlink, Network Unloaded
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Downlink , Network Loaded
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Downlink Comparison
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Uplink, Network Unloaded
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Uplink, Network Loaded
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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
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10 MHz eNB Spectral Emission Mask
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10 MHz Test
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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
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D Block Radiated Signal (1)
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D Block Radiated Signal (2)
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Map of Band 13 Signal Level
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Effect of D-Block Interference
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PSNB Testing
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Our “Dispatch”
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Radios & Test Equipment
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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
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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
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Generic PSCR Network Diagram
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New Mobiles
