Update on PSCR - NRPC

qualtaghblurtingΚινητά – Ασύρματες Τεχνολογίες

12 Δεκ 2013 (πριν από 3 χρόνια και 7 μήνες)

83 εμφανίσεις

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

eNB
eNB
HSS
Home Subscriber Server
MME
Mobility Management Entity
SGW
Serving Gateway
PGW
PDN 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
1.2
2

September 12
, 201
1
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 equipment

BS under


TX test

TX

19

PSCR Test Setup



UE
TX
RX
1
RX
2
eNB
TX
1
RX
1
TX
2
RX
2
2
1
40
dB
Attn
40
dB
Attn
50
ohm
1
1
2
1
1
2
2
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
9020
A
Interference Sig Gen
:
R
&
S SMU
200
A
Bi
-
directional coupler
:
Anatech AM
1515
DC
860
Circulator
:
Ditom D
3
C
0780
Splitter
/
Combiner
:
AEI AM
505
PD
1018
-
N
2
Combiner
Combiner
30
dB Tap
30
dB Tap
Bi
-
dir coupler
30
dB Tap
30
dB Tap
Bi
-
dir coupler
B
a
s
e

S
t
a
t
i
o
n
M
o
b
i
l
e

S
t
a
t
i
o
n
To
IN
From
OUT
Spirent RFI
SR
5500
Channel
Sim
1
To
IN
From
OUT
SR
5500
Channel
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 Band
748
-
777
Spurious
777
-
798
Spurious
728
-
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
-
3

Spurious

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 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



y = 0.0279x
4

+ 0.2526x
3

+ 4.475x
2

+ 305.76x + 2082.4

R² = 0.7939

-5000
0
5000
10000
15000
20000
25000
30000
-10
-5
0
5
10
15
20
25
30
PDSCH PHY Throughput vs 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
Ch
52
Ch
55
Ch
56
Ch
57
Ch
58
Ch
59
Ch
60
Ch
61
Ch
62
Ch
63
Ch
64
Ch
65
Ch
66
Ch
67
Ch
68
Ch
69
Ch
54
Ch
53
C
C
D
D
PS
BB
PS
NB
PS
NB
PS
BB
C
B
A
E
D
C
B
A
A
A
B
B
G
B
G
B
698
716
722
728
734
740
746
752
758
764
770
776
782
788
794
800
806
710
704
757
763
769
768
775
787
793
799
798
805
Ch
52
Ch
55
Ch
56
Ch
57
Ch
58
Ch
59
Ch
60
Ch
61
Ch
62
Ch
63
Ch
64
Ch
65
Ch
66
Ch
67
Ch
68
Ch
54
Ch
53
C
C
D
D
PS
BB
PS
NB
PS
NB
PS
BB
C
B
A
E
D
C
B
A
A
A
B
G
B
G
B
698
716
722
728
734
740
746
752
758
764
770
776
782
788
794
800
710
704
757
763
769
768
775
787
793
799
798
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



(728,
-
62)

(748,
-
62)

(748,
-
14)

(753,
-
14)

(753.7,
-
13)

(758,
-
13)

(768,
-
7)

(769,
-
8.4)

(769,
-
34)

(777,
-
34)

(777,
-
59)

(788,
-
96)

(798,
-
96)

(788,
-
59)

(777,
-
96)

-100
-80
-60
-40
-20
0
20
720
730
740
750
760
770
780
790
800
dBm/100kHz

Frequency (MHz)

Coexistence Limit
Colocation Limit
In
-
Band

and Out
-
of
-
Band

748
-
777MHz

Spurious

728
-
748MHz

Spurious

777
-
798MHz

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