Interference from IMT UE to DTV Receiver

Report
Realizing Green ICT Dream with TTA
CJK-IMT28-023
Statistical Analysis
for Out-Of-band Emission level of IMT UE
LIM, Euntaek
([email protected])
CJK IMT 28
Xi’an (西安), China
June 2 ~ 3, 2011
Interference scenario
Interference from IMT UE to DTV Receiver
5MHz Guard band: between IMT UE and ATSC Receiver
9MHz Guard band: between IMT UE and DVB-T Receiver
※ FDD option of AWG harmonized frequency allocation
Interference
CJK IMT 28, Xi’an, China
2/14
2
Simulation Parameters
• DTV and LTE UE system
Parameters
Cell layout
Scenario
Number of UE per km2
Inter-site distance
Duplex method
UE max transmit power
Uplink scheduler
Uplink power control
Parameters
Transmitter power
Transmitter antenna height
Separate distance
between DTV receivers
LTE Value
Hexagonal grid
Urban Macro
20 UEs
500m
FDD
23dBm
PF
Alpha = 0.8
DTV Value
92.16dBm
365m
DTV receiver’s location
Fixed grid
with constant separation
ATSC 8-VSD
DTV type
CJK IMT 28, Xi’an, China
Comments
ITU-R M.2135
PF factor = 1.2
3GPP TS 36.213
Comments
FCC CFR 47. Part 75
FCC CFR 47. Part 75
50m
3/14
3
Simulation environment
• Configuration of LTE system
• Path loss model
Distance range
Value
Comments
IMT UE → DTV Rx
Sub-urban Hata model
ERC Report 68
DTV Tx → IMT BS
P.1546
ITU-R Rec.
CJK IMT 28, Xi’an, China
4/14
4
Simulation methodology
• Flowchart for calculating DTV outage
LTE System
LTE Base
Station
Power
Control
Algorithm
Scheduling
Algorithm
DTV System
DTV Tx
Determine
scheduled
UEs and
compute Tx
power
LTE UE
Compute
outage
probability
CJK IMT 28, Xi’an, China
Pathloss Model
(SuburbanHata)
Compute level of
DTV received
signal
Compute level of
LTE UE’s
interference
DTV Rx
true
Outage
Pathloss
Model
(P.1546)
LTE UE’s interference
> DTV received signal ?
5/14
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Simulation result (1/5)
• DTV outage probability according to ACIR and ATSC Coverage
CJK IMT 28, Xi’an, China
6/14
6
Simulation result (2/5)
• DTV Outage according to ACIR of LTE UE
5MHz LTE UE ACIR
34.9dB
(Measurement)
39dB
(5MHz GB, Spec.)
42dB
(9MHz GB, Spec)
DTV outage increasing (68km)
1.8% (1.5↑)
1.2% (1.0↑)
1.0% (0.7↑)
DTV outage increasing (96km)
45.8% (5.2↑)
43.8% (3.1↑)
42.9% (2.3↑)
Increasing DTV Outage based on no interference from LTE UE
CJK IMT 28, Xi’an, China
7/14
7
Simulation result (3/5)
• DTV Outage according to DTV Coverage with given ACIR
DTV Coverage
(ATSC Rx Sensitivity level)
DTV outage
increasing
68Km
(-69dBm)
85Km
(-78dBm)
97km
(-84dBm)
ACIR: 39dB (5MHz GB)
1.1%(0.9↑)
17.1%(2.3↑)
25.7%(2.7↑)
ACIR: 42dB (9MHz GB)
1.0%(0.7↑)
16.1%(1.9↑)
45.2%(2.3↑)
Increasing DTV outage based on no interference
CJK IMT 28, Xi’an, China
8/14
8
Simulation result (4/5)
• DTV Outage with Fixed power of LTE UE based on 3GPP Spec.
– LTE UE spectrum mask: -25dBm/MHz (ACLR: 41dB)
– LTE UE Coexistence emission: -50dBm/MHz (ACLR: 66dB)
DTV Coverage
(ATSC Rx signal level)
LTE UE
Emission
level
CJK IMT 28, Xi’an, China
68Km
(-69dBm)
85Km
(-78dBm)
97km
(-84dBm)
-25dBm/MHz
5.9% (5.6)
30.8% (16.6)
60.6% (17.7)
-50dBm/MHz
0.7% (0.5)
15.1% (0.9)
44.0% (1.1)
9/14
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Simulation result (5/5)
• DTV Outage for the density of LTE UE
– DTV outage slightly increases when the density of LTE UE increases 5
Users/km2 to 20 User/Km2
( DTV Coverage: 97km)
CJK IMT 28, Xi’an, China
10/14
10
Summary
• DTV Outage based on APT band plan
– No power control
• All LTE UEs emit the same signal level in DTV in band based on 3GPP LTE UE
Spectrum emission mask
– Power control
• LTE UE emits the signal level in DTV in band based on 3GPP LTE UE ACLR
ATSC Coverage (km)
LTE UE emission level
68Km
(-69dBm)
85Km
(-78dBm)
97km
(-84dBm)
-25dBm/MHz
5.9% (5.6↑)
30.8% (16.6↑)
60.6% (17.7↑)
-50dBm/MHz
0.7% (0.5↑)
15.1% (0.9↑)
44.0% (1.1↑)
ACIR: 39 dB (5MHz GB, Spec)
1.2% (1.0↑)
14.7% (2.3↑)
43.5% (2.8↑)
ACIR: 42 dB (9MHz GB, Spec)
1.0% (0.7↑)
14.1% (1.7↑)
42.8% (2.0↑)
ACIR: 54 dB
(6MHz GB, Measurement)
0.6% (0.3↑)
12.8% (0.4↑)
41.3% (0.6↑)
0.4%
14.2%
42.9%
No power
control
Power
control
No interference
CJK IMT 28, Xi’an, China
11/14
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Annex
CJK IMT 28, Xi’an, China
12/14
12
Comparison with measurement and calculation
• DTV sensitivity level when LTE UE causes interference
– Measurement result
– Calculation result with LTE UE Tx ACLR
(It assumes that ATSC ACS is much more than LTE UE ACLR)
※ Measured LTE UE ACLR
LTE UE channel
Bandwidth
3MHz
5MHz
CJK IMT 28, Xi’an, China
ACLR 1
ACLR 2
51 dB
34.9dB
69.3 dB
54.1 dB
13/14
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Simulation Parameters
• Measurement result of minimum sensitivity level of DTV due
to interference from LTE UE in US band plan
※ Measured LTE UE ACLR
LTE UE channel
Bandwidth
3MHz
5MHz
CJK IMT 28, Xi’an, China
ACLR 1
ACLR 2
51 dB
34.9dB
69.3 dB
54.1 dB
14/14
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