ECC PT1 XBorder CG
ECC PT1 Cross-border CG(16)008
Date issued: 01 August 2016
Source:
Orange
Subject:
LTE2600 Border Coordination Simulation Results
Password protected:
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1. Introduction
ECC PT1 is revising the ECC Rec(11)04 and ECC Rec(11)05, in the revision of these two
ECC recommendations, it is proposed to use the field strength value at 6 km with preferential
PCI to the border line (0 km) for the case of non-preferential PCI.
In order to evaluate the impact from the network A to network B when the non preferential
PCI is used in the network A and preferential PCI is used by the network B, simulations for
LTE2600 are performed and the simulation results are presented.
2. Simulation scenario, method, and results
2.1. Simulation Scenario
Network
Borderlin
Network B
d1
d2
Figure 1. Simulation scenario
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Simulation scenario is illustrated in figure 1. Network A and Network B clusters (19 triosector sites, 57 cells) are placed cross the borderline. The distance d1 is the separation
distance from the network A reference cell site to the borderline, and d2 is the distance from
the reference cell site of the network B to the borderline. The separation distance between two
networs are d=d1+d2. The UEs are generated within the network coverage area, that means
within the cell ranges. In case of big separation distance d, UEs are not generated in the
borderline area.
The simulated case
1) 2600 MHz band 20 MHz channel vs 20 MHz channel with full overlap, as shown in
figure 2.
20 MHz
2655 MHz
2655 MHz
Figure 2: 20 MHz channel full overlap(Non Preferential frequency case)
2.2. Simulation assumptions
System parameters and simulation assumptions are summarized in annex 1. The simulations
are performed in rural area. As shown in figure 1, Network A using non preferential PCI has a
field strength at borderline is 47 dBuV/m/5 MHz at 3m, network B using preferential PCI has
a field strength level at borderline 65 dBuV/m/5 MHz at 3 m and 47 dBuV/m/5 MHz at 6 km
beyond the borderline.
The separation distance between network A reference cell and network B reference cell is
calculated as 7.7 km or 9.7 km depending the reference cell antenna azimuth and according
ITU-R P.1546-4 Land model. The detailed calculations have been included in annex 2.
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3. Simulation results
3.1. Simulation results using P1546 model for the interfering link
Simulations using ITU-R P.1546 model for the interference link have been
performed, in the LTE2600 simulations, the LTE2600 cell radius of 5km (cell range
2x5=10 km), 45m BS antenna height, 46 dBm Tx power are used. Two separation
distances of 7.7km and 9.7 km are considered.
DL throughput losses are given in table 1 and UL throughput losses are given in table
2.
Table 1. Results of calculations simulated interferences LTE2600 DL vs LTE2600
DL using P1546 model for the interference link
separation
distance
7.7 km
9.7 km
Azimuth of
victim reference
cell
0°
60°
0°
60°
Reference cell
average bitrate
loss (%)
10.547
0.649
3.981
0,237
Network average
bitrate loss
(%)
0.164
0.023
0.066
0.008
Table 2. Results of calculations simulated interferences LTE2600 UL vs LTE2600
UL using P1546 model for the interference link
separation
Azimuth of
Reference cell
Network average
distance
victim
average bitrate
bitrate loss
Reference cell
loss (%)
(%)
7.7 km
0°
0.941
0.024
60°
6.015
0.331
9.7 km
0°
0.304
0.007
60°
6.583
0.295
Simulations using the extended Hata model for the interference link are also
performed, but with different assumptions, since Extended – Hata propagation model
has an limitation of 100 km distance. These results were obtained with LTE 2600
MHz network layout with one BS tiers (7 tri-sector sites) for both networks with 2,5
km cell radius (5 km cell range), 45m BS antenna height, 46 dBm Tx power and for
separation distance 32.1km and 37.1km.
DL throughput losses are given in table 3 and UL throughput losses are given in table
4.
3
Table 3. Results of calculations simulated interferences LTE2600 DL vs LTE2600
DL using extended Hata model for the interference link
separation
distance
32.1 km
37.1 km
Azimuth of
victim reference
cell
0°
60°
0°
60°
Reference cell
average bitrate
loss (%)
0.476
0.845
0.183
0.371
Network average
bitrate loss
(%)
0.078
0.223
0.031
0.096
Table 4. Results of calculations simulated interferences LTE2600 UL vs LTE2600
UL using extended Hata model for the interference link
separation
Azimuth of
Reference cell
Network average
distance
victim
average bitrate
bitrate loss
Reference cell
loss (%)
(%)
32.1 km
0°
1.669
0.215
60°
0.201
0.050
37.1 km
0°
0.778
0.101
60°
0.078
0.021
It can be seen that at the trigger value of 47 dBuV/m/5 MHz at 3m at borderline for
non preferential PCI, when using the P1546 propagation model for the interfering
links, when the victim reference cell antenna is pointing to the borderline, the victim
reference downlink datarate can lose up to 10%, but the DL datarate loss using
Extended Hata model for interfering links with small LTE2600 cell radius is less than
2%.
4. Conclusions
Based on the simulation results presented in section 3, it can be considered that the
field strength level of 47 dBuV/m/5 MHz at 3 m at the border line for non preferential
PCI is acceptable.
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Annex 1. LTE system parameters & simulation assumptions
LTE2600 system parameters and simulation assumptions are given in Table A.1
Table A.1. LTE 2600MHz with bandwidth 20MHz system parameters used in the simulations
Parameter
Environment
BS antenna height (m)
BS UE Tx power (dBm) for both
FDD BS and SDL BS
BS antenna gain (dBi)
BS antenna downtilt (°)
BS feeder loss (dB)
BS antenna patterns
(Horizontal/Vertical)
Receiver noise figure (dB)
UE antenna height (m)
UE antenna gain (dBi)
Cell range (km)
Carrier frequency (MHz) (DL/UL)
Interfering system channel
bandwidth (MHz)
Victim system channel bandwidth
(MHz)
Propagation model for LTE BS to
UE
Number of UEs (transmitting
simultaneously) per cell
MCL BS to UE (dB)
Propagation model for the path
interfering BS to victim UE
Interfering LTE
network A (DL)
Rural
45
Victim LTE
network B (DL)
Urban/Rural
45
46
46
15
3
0
ITU-R F.1336
(H: 65°, k=0,7)
15
3
0
ITU-R F.1336
(H: 65°, k=0,7)
9 (UE) / 3 BS
1,5
-4
10 (Rural) / 5
2655 / 2530
1,5
-4
10 (Rural) / 5
2655 / 2530
20
20
Extended Hata
3
80
ITU-R P.1546-4 land and Extended Hata
Figure A1: BS antenna horizontal radiation pattern (ITU-R F1336)
5
Figure A2: BS vertical antenna pattern (ITU-R F1336)
Table A2 : LTE 20 MHz Channel UE Tx Mask
Frequency offset (MHz)
-40
-35.4
18000
-30.1
-35.4
18000
-30
-30
18000
-20
-30
18000
-10.1
-30
18000
-9.5
-16.2
18000
-9
0
18000
0
0
18000
9
0
18000
9.5
-16.2
18000
10.1
-30
18000
20
-30
18000
30
-30
18000
30.1
-35.4
18000
40
-35.4
18000
BW (kHz)
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Table A3: LTE 20 MHz Channel BS Tx Mask
Frequency offset (MHz)
-40
-48.4
BW (kHz)
18000
-30.1
-48.4
18000
-30
-45
18000
-20
-45
18000
-10.1
-45
18000
-9.5
-23
1000
-9
0
18000
0
0
18000
9
0
18000
9.5
-23
1000
10.1
-45
18000
20
-45
18000
30
-45
18000
30.1
-48.4
18000
40
-48.4
18000
Table A4: LTE 20 MHz channel UE receiver mask
Frequency offset (MHz)
-40
-30
-22.5
-17.5
-12.5
-10
10
12.5
17.5
22.5
30
40
Rejection
(dB)
43.7
43.7
43.7
31.7
29.3
200
200
29.3
31.7
43.7
43.7
43.7
Table A5: LTE 20 MHZ BS receiver mask
Frequency offset
(MHz)
-40
-30
-22.5
-17.5
Rejection (dB)
48.7
48.7
48.7
45.7
7
-12.5
-10
10
12.5
17.5
22.5
30
40
39.7
200
200
39.7
45.7
48.7
48.7
48.7
Annex 2. Separation distance calculation.
The power level and field strength are calculated with Extended Hata model and
ITU-R P.1546-4 method for UE reception antenna height of 3 m and BS antenna
height 45 m (in rural area),
The relation between field strength in dBmV/m and the power in dBm is
Prx(dBm) = Erx(dBmV/m)-20 log10(f)-77.2
For E = 47 dBµV/m/5MHz Prx = -98.6813 dBm/5MHz
For E = 65 dBµV/m/5MHz Prx = -80.6813 dBm/5MHz
PL (dB)= EiRP (dBm/5 MHz)- Prx(dBm)
In calculations were used 3GPP network layout, azimuth 0° for network B (65
dBuV/m/5 MHz at 3m) and azimuth 60° for network A (47 dBuV/m/5 MHz at 3m)
– figure below.
Figure A3: 3GPP network layout used in simulations
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Table A13. Calculation separation distance d1 for power level 47dBµV/m/5MHz at
borderline for 2655 MHz band for LTE 2600 MHz with 20MHz bandwidth
TxP (dBm/18 MHz)
46
Azimuth of antenna
0°
30°
60°
Antenna Gain (dBi)
15
12,6
4,8
EiRP (dBm/18MHz)
61
58.6
50.8
EiRP (dBm/5 MHz)
55.437
53.037
45.237
Erx(dBmV/m/5MHz)
47
Prx(dBm/5MHz)
-98.681
PL (dB)
154.118
151.718
143.918
D1 (km)
According Extended Hata /
31.1 / 8.2
28.3 / 7.3
20.1 / 4.8
ITU-R P.1546-4
Table A14. Calculation separation distance d2 for power level 65dBµV/m/5MHz at
borderline for 2655 MHz band for LTE 2600 MHz with 20MHz bandwidth
46
TxP (dBm/18 MHz)
0°
30°
60°
Azimuth of antenna
15
12,6
4,8
Antenna Gain (dBi)
61
58.6
50.8
EiRP (dBm/18MHz)
55.437
53.037
45.237
EiRP (dBm/5 MHz)
Erx(dBmV/m/5MHz)
65
-80.681
Prx(dBm/5MHz)
136.118
133.718
125.918
PL (dB)
D2 (km)
According Extended Hata /
12.0 / 2.9
10.1 / 2.6
6.0 / 1.5
ITU-R P.1546-4
Total separation distance for this layout:
D = d1@60° + d2@0°
According ITU-R P.1546-4 land model:
D = 4.8 km + 2.9 km = 7.7 km
According extended Hata model:
D = 20.1 km + 12 km = 32.1 km
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