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INTERFERENCE MANAGEMENT SCHEME IN 5G SMALL CELLS OVERLAID
HETEROGENEOUS CELLULAR NETWORKS
This study is intended to predict Interference level in a typical deployment of 5G
NR in a Heterogeneous Cellular Network consisting 4G/5G Non Stand Alone (NSA)
and 5G NR Pico cell in different scenarios or cases using professional radio
planning tool called Atoll. The first case is to have 5G NSA co-located in an existing
LTE network in a region of LAGOS of an area 165.69km2 by placing 5G NR network
on top, that will improve the performance of the first. The second case is to add 5G
NR Pico sites to a nearby Office Complex and Shopping Mall to improve Indoor
coverage and throughput or internet service.
 4G eNodeB Macro sites will operator using 2600MHz frequency, band 20 and
bandwidth of 20MHz.
 5G NR Small and Pico sites will operate using 3.5GHz mid-frequency, band n78
with a bandwidth of 50MHz and Channel of NR-AFRCN 621667.
4G & 5G SITE PARAMETERS
PARAMETER VALUE
Frequency(GHz) 3.5GHz
Band N78
Bandwidth(MHz) 50MHz
Layer Macro Cell
Max Power of AAU 100W 50dBm
Min SS-RSRP -140dBm
Transmission losses 1.51dB
Antenna height 30m
Receiver height 1.5m
PARAMETER VALUE
Frequency(GHz) 2600 MHz Frequency
Band Band 20
Bandwidth(MHz) 20MHZ
Layer Macro Cell
Max Power of RRU/RRH 60W 47dBm
Min RSRP -140dBm
Transmission losses 1.51dB
Antenna height 30m
Receiver height 1.5m
INDUSTRY RF PLANNING TOOL -ATOLL
PLANNED AREA
Fig: 4.1 Digital Terrain Map (DTM) of Nigeria at 50m Resolution
PLANNED AREA
Fig4.2 Study area of 165.59km2 considered for the HetNet 5G NR
Interference Modeling using ATOLL
PLANNED AREA
Fig 4.3 Zoom Area of Plan Coverage: 165.59km2
PLANNED AREA
Determine; No. of .Sites (N), radius R and inter-sites distance D.
 D (inter-Site Distance) = 1.5 x R
 We will consider 5km to be inter-sites distance D
D = 1.5 x R
5km = 1.5 x R
Therefore R = 3.33km
N = TOTAL AREA / Area of a single site (A site)
Asite = 1.94 X R2
= 1.94 X 3.332
= 21.51km2
Therefor N = 165.59/21.51  7 SITES.
7 sites 4G/5G co-located require to cover the total area of 165.59Km2
We need to estimate the number of sites require to provide good coverage to cover the
total area of 165.59 kilometers square considered for the study.
Fig 4.4 Zoom Area of Plan Coverage: as shown on google map 165.59km2
PLANNED AREA
4G & 5G CO-LOCATED & PICO SITES SA
M-Macro site
P-Pico Site
4G & 5G & PICO TRANSMITTERS
4G LTE CELL PARAMETERS
5G Small & PICO LTE CELL PARAMETERS
4G & 5G TRANSMITTERS
ACTIVE 5G TRANSMITTERS
ACTIVE 4G TRANSMITTERS
STUDY PREDICTIONS- COVERAGE BY TRANSMITTERS
STUDY PREDICTIONS- COVERAGE BY SIGNAL LEVEL DL (dBm)
Initialize MBS and PBS Power at 47dBm and 50dBm, signal strength(mean) -73.49dBm
STUDY PREDICTIONS- OVERLAPPING ZONES)
These overlapping zones causes Interference in 4G/5G Heterogeneous Networks from the neighboring cells
STUDY PREDICTIONS- INTERFERENCE LEVEL FROM OVERLAPPING ZONES)
STUDY PREDICTIONS- 4G INTERFERENCE LEVEL FROM
OVERLAPPING ZONES)
We can see that with power set at 47dbm and 50dBM, MLAG005_S3 is highly interfered from neighboring
cells MLAG003_2,MLAG002_2 and MLAG003_3 (-91.99dBm)
STUDY PREDICTIONS- 5G NR POWER & INTERFERERNCE)
UE at the cell edge will experience low SINR due to low coverage which will result in low throughput, UE
within less 1Km radius from the site will have good SINR(>20) resulting in good throughput. However as
power and UE increases, the uplink load increases resulting in uplink high interference .
STUDY PREDICTIONS- INCREASING THE MACRO & PICO
CELL POWER BY 2dBm)
Increasing 4G&5G Macro and Pico cells by 2dBm
STUDY PREDICTIONS- COVERAGE BY SIGNAL LEVEL: INCREASING
MACRO & PICO CELL POWER BY 2dBm)
Increasing both Macro and Pico cell Power by 2dBm increases the signal
strength(coverage) from -73.49dBm to -71.9dBm. Signal strength increased
by i.e. 2%
STUDY PREDICTIONS- OVERLAPPING ZONES BY
INCREASING MACRO & PICO CELL BY POWER BY 2dBm)
Increasing both Macro and Pico cell Power by 2dBm increases cell
overlapping zone from 1.39 to 1.43, i.e. by 2.87% , which will eventually
lead to overlapping of many neighboring cells thereby increasing the
interference.
STUDY PREDICTIONS- 4G INTERFERENCE LEVL IN THE
OVERLAPPING ZONES BY INCREASING MACRO & PICO
CELL POWER BY 2dBm)
From the prediction study, it is observed that increasing cell power by 2dBm increases the interference
level on 4G cells MLAG005_S3 from 91.99dBm to -91.79dBm, i.e. about 0.22% in the same point.
STUDY PREDICTIONS- 4G INTERFERENCE LEVL IN THE
OVERLAPPING ZONES BY INCREASING MACRO & PICO
CELL POWER BY 2dBm)
From the prediction study, it is observed increasing cell power by 2dBm increases the interference level on
MLAG005_S3 from 91.99dBm to -91.79dBm.
STUDY PREDICTIONS- 5G INTERFERENCE LEVL IN THE
OVERLAPPING ZONES BY INCREASING MACRO & PICO
CELL BY POWER BY 2dBm)
Increased in Power increases SINR from 0.15 to 1.19 which means low BER, however there will be an
increase in Interference from nearby neighboring cells as coverage size increases.
STUDY PREDICTIONS- 5G INTERFERENCE LEVL)
It is observed with cell power at 50dBm I+N is -91.75dBm, as we increase cell power I+N will increase
resulting in interference from neighbor cells.
STUDY PREDICTIONS- 5G INTERFERENCE LEVL IN THE
OVERLAPPING ZONES BY INCREASING MACRO & PICO
CELL POWER BY 2dBm)
Increased in Power increases the SS-RSRP and SINR however there is an increase in Interference from nearby
neighboring cells. It is observed increased by power increase signal strength from -119.91 dBm to -118.08 dBm.
ITERATIONS AND ANALYSIS OF INTERFERENCE INCREASING POWER BY 2dBm
 Increasing Cell Reference Signal Power(RS) by 2dBm increases the signal strength/cell coverage by a factor of 2%
 Increasing RS Power in Macro and Pico Cell resulted an increased in cell overlapping by 2.87%
 Increasing RS Power by 2dBm increased the coverage size from 142.7Km2 to 147.4Km2, about 3.29% increment.
 Increasing the Power resulted in the improvement of SINR from 0.15 to 1.19
 Increasing The power resulted in the improvement of SS-RSRP from -119.91 dBm to -118.08 dBm.
 Increasing cell transmit power increased interference for 4G cell MLAG005_S3 from 91.99dBm to -91.79dBm
 Increasing cell transmit power increased (I+N) -91.75dBm to -91.05 on 5G cell.
Using signal strength factor of 2% , Interference factor of 0.2dB, Interference factor (I+N) 0.7, overlapping zone
factor of 2.87% results in the summary table below.
PREDICT
IONS
CELL
TYPE
MAX TX
POWER
(dBm)
RS/SS- EPRE
POWER(dBm)
SIGNAL
STRENGTH(
dBm)
AVG.
INTERF
(dBm)
(I+N)/dB
m
ACCEPTABLE
LEVEL(dBm)
1
LTE 47 16.2
-73.49 -91.62
-91.49 -106
5G NR 50 15 -91.75 -106
2
LTE 47 17.9
-71.91 -91.22
-91.39 -106
5G NR 50 17 -91.05 -106
3
LTE 47 19.6
-70.47 -90.82
-91.29 -106
5G NR 50 19 -90.35 -106
4
LTE 47 21.3
-69.06 -90.42
-91.19 -106
5G NR 50 21 -89.65 -106
5
LTE 47 23
-67.68 -90.02
-91.09 -106
5G NR 50 23 -88.95 -106
6
LTE 47 24.7
-66.33 -89.62
-90.99 -106
5G NR 50 25 -88.25 -106
7
LTE 47 26.4
-65.00 -89.22
-90.89 -106
5G NR 50 27 -87.55 -106
8
LTE 47 28.1
-63.70 -88.82
-90.79 -106
5G NR 50 29 -86.85 -106
9
LTE 47 29.8
-62.43 -88.42
-90.69 -106
5G NR 50 31 -86.15 -106
10
LTE 47 31.5
-61.18 -88.02
-90.59 -106
5G NR 50 33 -85.45 -106
4G/5G HETEROGENOUS INTERFERENCE LEVEL RESULTS
4G/5G HETEROGENOUS INTERFERENCE LEVEL RESULTS
ITER.
Signal
Strength(d
Bm)
4G/5G
Interference(dBm)
1 -73.49 -91.62
2 -71.91 -91.22
3 -70.47 -90.82
4 -69.06 -90.42
5 -67.68 -90.02
6 -66.33 -89.62
7 -65.00 -89.22
8 -63.70 -88.82
9 -62.43 -88.42
10 -61.18 -88.02
4G/LTE HETEROGENOUS INTERFERENCE LEVEL RESULTS
Ite
rat
io
n
Cell
Type
Max TX
Power
(dBm)
RS
Power
(dBm)
Interfer
ence(d
Bm)(I+
N)
Interf.
Lev(dB
m)
1
LTE 47 16.2 -91.49 -106
2
LTE 47 17.9 -91.39 -106
3
LTE 47 19.6 -91.29 -106
4
LTE 47 21.3 -91.19 -106
5
LTE 47 23 -91.09 -106
6
LTE 47 24.7 -90.99 -106
7
LTE 47 26.4 -90.89 -106
8
LTE 47 28.1 -90.79 -106
9
LTE 47 29.8 -90.69 -106
10
LTE 47 31.5 -90.59 -106
5G NR HETEROGENOUS INTERFERENCE LEVEL RESULTS
Ite
rat
io
n
Cell
Type
Max TX
Power
(dBm)
RE
Power
(dBm)
Interfer
ence(d
Bm)(I+
N)
Interf.
Lev(dB
m)
1
5G NR 50 15 -91.75 -106
2
5G NR 50 17 -91.05 -106
3
5G NR 50 19 -90.35 -106
4
5G NR 50 21 -89.65 -106
5
5G NR 50 23 -88.95 -106
6
5G NR 50 25 -88.25 -106
7
5G NR 50 27 -87.55 -106
8
5G NR 50 29 -86.85 -106
9
5G NR 50 31 -86.15 -106
10
5G NR 50 33 -85.45 -106
4G/5G HETEROGENOUS INTERFERENCE LEVEL RESULTS
CONVERT POWER WATT to dBm
Power, P(dbm) = 10 * LOG( Watt * 1000)
RS RE Power(dBm) = Max Power Per TX Port – (10*LOG10(PRB*12 subcarriers))
SS-RSRP EPRE Power is configured on the 5G NR through parameter.
PDSCH EPRE Offset/RS(db) is also a parameter configured on eNODEB
GENERATING SIMILAR RESULTS USING FUZZY SET IN MATLAB
INTPUT CELL POWER, USERS

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5G NR HetNet Interference Prediction using Atoll and Fuzzy Logic.pptx

  • 1. INTERFERENCE MANAGEMENT SCHEME IN 5G SMALL CELLS OVERLAID HETEROGENEOUS CELLULAR NETWORKS This study is intended to predict Interference level in a typical deployment of 5G NR in a Heterogeneous Cellular Network consisting 4G/5G Non Stand Alone (NSA) and 5G NR Pico cell in different scenarios or cases using professional radio planning tool called Atoll. The first case is to have 5G NSA co-located in an existing LTE network in a region of LAGOS of an area 165.69km2 by placing 5G NR network on top, that will improve the performance of the first. The second case is to add 5G NR Pico sites to a nearby Office Complex and Shopping Mall to improve Indoor coverage and throughput or internet service.  4G eNodeB Macro sites will operator using 2600MHz frequency, band 20 and bandwidth of 20MHz.  5G NR Small and Pico sites will operate using 3.5GHz mid-frequency, band n78 with a bandwidth of 50MHz and Channel of NR-AFRCN 621667.
  • 2. 4G & 5G SITE PARAMETERS PARAMETER VALUE Frequency(GHz) 3.5GHz Band N78 Bandwidth(MHz) 50MHz Layer Macro Cell Max Power of AAU 100W 50dBm Min SS-RSRP -140dBm Transmission losses 1.51dB Antenna height 30m Receiver height 1.5m PARAMETER VALUE Frequency(GHz) 2600 MHz Frequency Band Band 20 Bandwidth(MHz) 20MHZ Layer Macro Cell Max Power of RRU/RRH 60W 47dBm Min RSRP -140dBm Transmission losses 1.51dB Antenna height 30m Receiver height 1.5m
  • 3. INDUSTRY RF PLANNING TOOL -ATOLL
  • 4. PLANNED AREA Fig: 4.1 Digital Terrain Map (DTM) of Nigeria at 50m Resolution
  • 5. PLANNED AREA Fig4.2 Study area of 165.59km2 considered for the HetNet 5G NR Interference Modeling using ATOLL
  • 6. PLANNED AREA Fig 4.3 Zoom Area of Plan Coverage: 165.59km2
  • 7. PLANNED AREA Determine; No. of .Sites (N), radius R and inter-sites distance D.  D (inter-Site Distance) = 1.5 x R  We will consider 5km to be inter-sites distance D D = 1.5 x R 5km = 1.5 x R Therefore R = 3.33km N = TOTAL AREA / Area of a single site (A site) Asite = 1.94 X R2 = 1.94 X 3.332 = 21.51km2 Therefor N = 165.59/21.51  7 SITES. 7 sites 4G/5G co-located require to cover the total area of 165.59Km2 We need to estimate the number of sites require to provide good coverage to cover the total area of 165.59 kilometers square considered for the study.
  • 8. Fig 4.4 Zoom Area of Plan Coverage: as shown on google map 165.59km2 PLANNED AREA
  • 9. 4G & 5G CO-LOCATED & PICO SITES SA M-Macro site P-Pico Site
  • 10. 4G & 5G & PICO TRANSMITTERS
  • 11. 4G LTE CELL PARAMETERS
  • 12. 5G Small & PICO LTE CELL PARAMETERS
  • 13. 4G & 5G TRANSMITTERS ACTIVE 5G TRANSMITTERS ACTIVE 4G TRANSMITTERS
  • 14. STUDY PREDICTIONS- COVERAGE BY TRANSMITTERS
  • 15. STUDY PREDICTIONS- COVERAGE BY SIGNAL LEVEL DL (dBm) Initialize MBS and PBS Power at 47dBm and 50dBm, signal strength(mean) -73.49dBm
  • 16. STUDY PREDICTIONS- OVERLAPPING ZONES) These overlapping zones causes Interference in 4G/5G Heterogeneous Networks from the neighboring cells
  • 17. STUDY PREDICTIONS- INTERFERENCE LEVEL FROM OVERLAPPING ZONES)
  • 18. STUDY PREDICTIONS- 4G INTERFERENCE LEVEL FROM OVERLAPPING ZONES) We can see that with power set at 47dbm and 50dBM, MLAG005_S3 is highly interfered from neighboring cells MLAG003_2,MLAG002_2 and MLAG003_3 (-91.99dBm)
  • 19. STUDY PREDICTIONS- 5G NR POWER & INTERFERERNCE) UE at the cell edge will experience low SINR due to low coverage which will result in low throughput, UE within less 1Km radius from the site will have good SINR(>20) resulting in good throughput. However as power and UE increases, the uplink load increases resulting in uplink high interference .
  • 20. STUDY PREDICTIONS- INCREASING THE MACRO & PICO CELL POWER BY 2dBm) Increasing 4G&5G Macro and Pico cells by 2dBm
  • 21. STUDY PREDICTIONS- COVERAGE BY SIGNAL LEVEL: INCREASING MACRO & PICO CELL POWER BY 2dBm) Increasing both Macro and Pico cell Power by 2dBm increases the signal strength(coverage) from -73.49dBm to -71.9dBm. Signal strength increased by i.e. 2%
  • 22. STUDY PREDICTIONS- OVERLAPPING ZONES BY INCREASING MACRO & PICO CELL BY POWER BY 2dBm) Increasing both Macro and Pico cell Power by 2dBm increases cell overlapping zone from 1.39 to 1.43, i.e. by 2.87% , which will eventually lead to overlapping of many neighboring cells thereby increasing the interference.
  • 23. STUDY PREDICTIONS- 4G INTERFERENCE LEVL IN THE OVERLAPPING ZONES BY INCREASING MACRO & PICO CELL POWER BY 2dBm) From the prediction study, it is observed that increasing cell power by 2dBm increases the interference level on 4G cells MLAG005_S3 from 91.99dBm to -91.79dBm, i.e. about 0.22% in the same point.
  • 24. STUDY PREDICTIONS- 4G INTERFERENCE LEVL IN THE OVERLAPPING ZONES BY INCREASING MACRO & PICO CELL POWER BY 2dBm) From the prediction study, it is observed increasing cell power by 2dBm increases the interference level on MLAG005_S3 from 91.99dBm to -91.79dBm.
  • 25. STUDY PREDICTIONS- 5G INTERFERENCE LEVL IN THE OVERLAPPING ZONES BY INCREASING MACRO & PICO CELL BY POWER BY 2dBm) Increased in Power increases SINR from 0.15 to 1.19 which means low BER, however there will be an increase in Interference from nearby neighboring cells as coverage size increases.
  • 26. STUDY PREDICTIONS- 5G INTERFERENCE LEVL) It is observed with cell power at 50dBm I+N is -91.75dBm, as we increase cell power I+N will increase resulting in interference from neighbor cells.
  • 27. STUDY PREDICTIONS- 5G INTERFERENCE LEVL IN THE OVERLAPPING ZONES BY INCREASING MACRO & PICO CELL POWER BY 2dBm) Increased in Power increases the SS-RSRP and SINR however there is an increase in Interference from nearby neighboring cells. It is observed increased by power increase signal strength from -119.91 dBm to -118.08 dBm.
  • 28. ITERATIONS AND ANALYSIS OF INTERFERENCE INCREASING POWER BY 2dBm  Increasing Cell Reference Signal Power(RS) by 2dBm increases the signal strength/cell coverage by a factor of 2%  Increasing RS Power in Macro and Pico Cell resulted an increased in cell overlapping by 2.87%  Increasing RS Power by 2dBm increased the coverage size from 142.7Km2 to 147.4Km2, about 3.29% increment.  Increasing the Power resulted in the improvement of SINR from 0.15 to 1.19  Increasing The power resulted in the improvement of SS-RSRP from -119.91 dBm to -118.08 dBm.  Increasing cell transmit power increased interference for 4G cell MLAG005_S3 from 91.99dBm to -91.79dBm  Increasing cell transmit power increased (I+N) -91.75dBm to -91.05 on 5G cell. Using signal strength factor of 2% , Interference factor of 0.2dB, Interference factor (I+N) 0.7, overlapping zone factor of 2.87% results in the summary table below.
  • 29. PREDICT IONS CELL TYPE MAX TX POWER (dBm) RS/SS- EPRE POWER(dBm) SIGNAL STRENGTH( dBm) AVG. INTERF (dBm) (I+N)/dB m ACCEPTABLE LEVEL(dBm) 1 LTE 47 16.2 -73.49 -91.62 -91.49 -106 5G NR 50 15 -91.75 -106 2 LTE 47 17.9 -71.91 -91.22 -91.39 -106 5G NR 50 17 -91.05 -106 3 LTE 47 19.6 -70.47 -90.82 -91.29 -106 5G NR 50 19 -90.35 -106 4 LTE 47 21.3 -69.06 -90.42 -91.19 -106 5G NR 50 21 -89.65 -106 5 LTE 47 23 -67.68 -90.02 -91.09 -106 5G NR 50 23 -88.95 -106 6 LTE 47 24.7 -66.33 -89.62 -90.99 -106 5G NR 50 25 -88.25 -106 7 LTE 47 26.4 -65.00 -89.22 -90.89 -106 5G NR 50 27 -87.55 -106 8 LTE 47 28.1 -63.70 -88.82 -90.79 -106 5G NR 50 29 -86.85 -106 9 LTE 47 29.8 -62.43 -88.42 -90.69 -106 5G NR 50 31 -86.15 -106 10 LTE 47 31.5 -61.18 -88.02 -90.59 -106 5G NR 50 33 -85.45 -106 4G/5G HETEROGENOUS INTERFERENCE LEVEL RESULTS
  • 30. 4G/5G HETEROGENOUS INTERFERENCE LEVEL RESULTS ITER. Signal Strength(d Bm) 4G/5G Interference(dBm) 1 -73.49 -91.62 2 -71.91 -91.22 3 -70.47 -90.82 4 -69.06 -90.42 5 -67.68 -90.02 6 -66.33 -89.62 7 -65.00 -89.22 8 -63.70 -88.82 9 -62.43 -88.42 10 -61.18 -88.02
  • 31. 4G/LTE HETEROGENOUS INTERFERENCE LEVEL RESULTS Ite rat io n Cell Type Max TX Power (dBm) RS Power (dBm) Interfer ence(d Bm)(I+ N) Interf. Lev(dB m) 1 LTE 47 16.2 -91.49 -106 2 LTE 47 17.9 -91.39 -106 3 LTE 47 19.6 -91.29 -106 4 LTE 47 21.3 -91.19 -106 5 LTE 47 23 -91.09 -106 6 LTE 47 24.7 -90.99 -106 7 LTE 47 26.4 -90.89 -106 8 LTE 47 28.1 -90.79 -106 9 LTE 47 29.8 -90.69 -106 10 LTE 47 31.5 -90.59 -106
  • 32. 5G NR HETEROGENOUS INTERFERENCE LEVEL RESULTS Ite rat io n Cell Type Max TX Power (dBm) RE Power (dBm) Interfer ence(d Bm)(I+ N) Interf. Lev(dB m) 1 5G NR 50 15 -91.75 -106 2 5G NR 50 17 -91.05 -106 3 5G NR 50 19 -90.35 -106 4 5G NR 50 21 -89.65 -106 5 5G NR 50 23 -88.95 -106 6 5G NR 50 25 -88.25 -106 7 5G NR 50 27 -87.55 -106 8 5G NR 50 29 -86.85 -106 9 5G NR 50 31 -86.15 -106 10 5G NR 50 33 -85.45 -106
  • 33. 4G/5G HETEROGENOUS INTERFERENCE LEVEL RESULTS CONVERT POWER WATT to dBm Power, P(dbm) = 10 * LOG( Watt * 1000) RS RE Power(dBm) = Max Power Per TX Port – (10*LOG10(PRB*12 subcarriers)) SS-RSRP EPRE Power is configured on the 5G NR through parameter. PDSCH EPRE Offset/RS(db) is also a parameter configured on eNODEB
  • 34. GENERATING SIMILAR RESULTS USING FUZZY SET IN MATLAB INTPUT CELL POWER, USERS