CEPT
ECC
Electronic Communications Committee
CPG-PTD ad hoc (13)04
CPG-15 PTD
CPG-15 PTD CG
Geneva, 2-3 July 2013
Date issued:
26 June 2013
Source:
Orange
Some LTE parameters for Monte-Carlo simulations of interference from
LTE uplink to fixed rooftop DTT reception
Subject:
Password protection required?
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(Y/N)
Summary:.
Proposal:
This document provides several LTE parameters for adjacent band compatibility study between
DTT and IMT/LTE. It is proposed for PTD consideration, agreed parameters are to be used in the
analysis and simulations of interference from IMT/LTE uplink to DTT fixed roof-top reception.
Background:
Reference documents:
CPG-PTD(13)044 GSMA: Input on UHF adjacent band modelling
CPG-PTD(13)038rev1 France: AI 1.2 adjacent band compatibility studies
CPG-PTD(13)057 EBU: AI 1.2 adjacent band compatibility
CPG-PTD(13)058rev1 EBU: AI 1.2 OOB Monte Carlo simulations
CPG-PTD(13)059 Orange: Simulations of potential interference from LTE UE to DVB-T
CPG-PTD(13)068 Annex 11 Framework for the CPG/PT D studies on co-existence between the
mobile service to be deployed in the band 694-790 MHz and the broadcasting service operating
below 694 MHz
ITU-R JTG56 report
DOCUMENT1
-2-
Some LTE parameters for Monte-Carlo simulations of interference from LTE
uplink to fixed rooftop DTT reception
1
Introduction
This document presents some elements regarding LTE system parameters to be used in the
simulation of interference from LTE uplink to DTT fixed rooftop DTT reception.
2
2.1
IMT/LTE parameters
UE TRP vs TxP
UE transmit power is specified in the standard as transmit power measured in conducted
connection, the lab measurement results given in figure 1 show that the difference between UE TxP
and TRP(Total Radiated Power) is at least 3 dB, in average 4 dB. Using UE antenna gain of -3 dB
as recommended by WP5D is justified by lab measurement results.
LTE800 UE Radiated Tx Power
Norminal
Conducted Tx
Power=23 dBm
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Average radiated
Tx Power=18,6
dBm
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Figure 1. UE TRP lab test results (28 LTE800 UEs)
2.2
UE unwanted emissions
4 different UEs (from different vendors, have different chipsets inside) are tested, behaviours are
quite similar, the test results of unwanted emissions for one of the 4 tested LTE800 UEs at different
Tx power levels are plotted in figure 2 and figure 3.
dBm/9 MHz
-3-
25
20
15
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
Spec_Pmax
UE4_Pmax
UE4@0 dBm
UE4@-10 dBm
UE4_Pmin
832-842
842-852
852-862
862-872
872-882
882-892
dBm/9 MHz
Figure 2. Measured UE (UE#4) OOBE (QPSK modulation, 50 RBs)
25
20
15
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
Spec_Pmax
UE4_Pmax
UE4@0 dBm
UE4@-10 dBm
UE4_Pmin
832-842
842-852
852-862
862-872
872-882
882-892
Figure 3. Measured UE (UE#4) OOBE (QPSK modulation, 12 RBs)
Figure 3 and figure 4 show that
1) When Tx power is lower, UE unwanted emissions are lower, the decrease of unwanted
emissions is more rapid than Tx power reduction before reaching the thermal noise floor of
the test equipment.
2) Within 20 MHz frequency offset, OOBE of a UE with 12 RBs is lower than 50 RBs. The
figure 4 of ECC SE24 document <M70_04R0_SE24> shows the similar behaviour.
2.3
LTE uplink cell throughput
For 10 MHz channel with 2 BS antennas configuration, cell max throughput is 15 Mbit/s, cell
average throughput is 13 Mbit/s, shared by the number of uplink active UEs.
Derivation of DVB-T receiver ACS using the information from in ITU-R Recommendations
BT.1368 and BT.2033 was discussed and agreed at PTD in May 2013, the ACS values for DVB-T2
receiver provided are copied below.
-4-
Table 1. DVT-T2 receiver ACS
Derived ACS values for silicon
tuners from the un-corrected
protection ratios (dB) for a
DVBT2 signal interfered with
by an LTE UE signal in adjacent
channels for silicon
tunersChannel offset N
1 Mbit/s UE
10 Mbit/s UE
20 Mbit/s UE
8 MHz channels/ (centre
frequency offset)
traffic loading
traffic loading
traffic loading
Signal generator Signal generator
ACLR =
ACLR = Signal generator
100 dB all
100 dB all
ACLR =
offsets
offsets
67.8 dB (N+1)
ACS Percentile
ACS Percentile
80.4 dB (N+2)
100 dB (N+3 to
N+9)
ACS Percentile
dB
dB
dB
50th
90th
50th
90th
50th
90th
1/(10)
55.0
38.0
60.0
58.0
60.8
58.5
2 (18)
60.0
43.0
66.0
64.0
66.2
62.1
3 (26)
63.0
45.0
67.0
64.0
69.0
63.0
4 (34)
65.0
55.0
67.0
64.0
71.0
64.0
5 (42)
66.0
56.0
67.0
63.0
73.0
65.0
6 (50)
69.0
57.0
68.0
62.0
71.0
64.0
7 (58)
69.0
60.0
68.0
63.0
72.0
63.0
8 (66)
69.0
60.0
68.0
61.0
73.0
64.0
9 (74)
69.0
62.0
68.0
62.0
73.0
66.0
In the Monte-Carlo simulations, it is proposed to use DTT receiver ACS following the number of
uplink active users per cell:
For 1 user/cell, use 20 Mbit/s ACS values
For 2 to 9 users/cell, use 10 Mbit/s ACS
2.4
Density of active users
The LS from WP5D to JTG4567 (JTG4567 doc/49) has given that according to JTG 5-6/180 Annex
2, user terminal density in active mode to be used in sharing studies is 0.17/ 5MHz/km2. This active
user density is for rural area, for urban/sub-urban area, the active user density given in JTG 5-6/180
Annex 2 is 2,16/5MHz/km2.
It is also proposed that indoor user terminal usage is 50% for macro rural scenario and 70% for
macro urban/suburban scenario. LTE800 link budget gives that ratio between downlink average cell
-5-
throughput and uplink average cell throughput is 1.5, so the uplink activity percentage is 40%, and
downlink 60%.
Table 2. Number of active users per cell
Active user density (x/5MHz/km2)
Active user density (x/10MHz/km2)
D/UL activity factor ratio
UL activity percentage
DL activity percengtage
LTE Cell Range (Km)
Cell surface (km2)
Ratio indoor users
UL active indoor user per cell
UL active outdoor user per cell
UL Active users per cell Indoor in simulation
UL Active users per cell Outdoor in simulation
Wall penetration factor (dB)
Rural
0,17
0,34
1,5
40%
60%
8
41,569
50%
2,8
2,8
3
3
10
Sub-urban
2,16
4,32
1,5
40%
60%
2
2,598
70%
3,1
1,3
3
2
15
Urban
2,16
4,32
1,5
40%
60%
1
0,650
70%
0,8
0,3
1
1
20
It should be pointed out that in urban area, DTT fixed roof-top antenna height is not at 10m, but in
average at 20 m (in average 6 floors in European cities). It is proposed to use 10 m DTT antenna
height for rural and sub-urban area, but 20 m for urban area.
3
Conclusions
This document provides several LTE parameters for adjacent band compatibility study between
DTT and IMT/LTE. It is proposed for PTD consideration, agreed parameters are to be used in the
analysis and simulations of interference from IMT/LTE uplink to DTT fixed roof-top reception.