08 02 ra41208en40gla1 lte radio planning capacity
TRANSCRIPT
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LTE RPESSLTE TDD Radio Capacity Planning
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Index• LTE/EPC Overview
• LTE Air Interface
• Air Interface Overheads
• RRM overview
• LTE Link Budget
• Radio Planning – Coverage Planning Cell Range
• Radio Planning – Capacity
• LTE Performance Simulations
• NSN LTE Solution
• Initial Parameters Planning
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Module Objectives
After completing this module, the participant should be able to:
• Evaluate the cell capacity
• Explain the main factors impacting the cell capacity
•
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Radio Planning Capacity
Cell Capacity (Throughput)
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Simulation Assumptions
Parameter/Feature UL DL
Operating Band 2600 MHz 2600 MHz
Transmission power per PRB Open loop power control; max UE
power 23dBm
0.8 W (for every bandwidth
configuration)
Antenna Scheme Number of TX antenna = 1Number of RX antenna = 2
Number of TX antenna = 1Number of RX antenna = 2
Hexagonal layout 3 sector layout, 7 sites, 21 cells 3 sector layout, 7 sites, 21 cells
Scheduling Channel unaware with Round Robin
strategy
Channel aware with Proportional
Fairness
Mean number of users per sector 10 UEs (ISD = 500m)
30 UEs (ISD = 1732m)
60 UEs (ISD = 3000m)
164 UEs (ISD = 9000m)
10 UEs per sector
210 UEs per area
Number of users per TTI 1 (1.4 MHz)
3 (3 MHz)
7 (5 MHz)
10 (10 MHz)
20 (15 & 20 MHz)
1 (1.4 MHz)
3 (3 MHz)
7 (5 MHz)
10 (10 MHz)
20 (15 & 20 MHz)
UE speed 3Km/h 3Km/h
Traffic model Full buffer * Full buffer *
Propagation model 3GPP TR 25.814 (macro cell) 3GPP TR 25.814 (macro cell)
*Full Buffer indicates the cell load is always 100% independent on the number of subscribers in the cell ortheir position in the cell
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0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.4 MHz 3 MHz 5 MHz 10 MHz 15 MHz 20 MHz
500
1732
3000
9000
Down Link Spectral Efficiency SIMO
UL/DL Spectral Efficiency
Note: Assumption of 100% Load.
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0.10
0.20
0.30
0.40
0.50
0.60
1.4 MHz 3 MHz 5 MHz 10 MHz 15 MHz 20 MHz
500
1732
3000
9000
Uplink Spectral Efficiency SIMO
b p s / H z
b p s / H z
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UL/DL Cell Throughput to MAPL and Coverage
0.00
2000.00
4000.00
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400 639 1695 9123
20 MHz FC1 SSF5
15MHz FC1 SSF5
10MHz FC1 SSF5
20 MHz FC2 SSF5
15MHz FC2 SSF5
10MHz FC2 SSF5
k b p s
TDD RL 15 UL Cell Throughput based on ISD Distance
Comparison of
Frame Configuration 1 (FC1)Special Subframe Configuration (SSF)
5 and 7 Configuration
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20 MHz FC1 SSF7
15MHz FC1 SSF7
10MHz FC1 SSF7
20 MHz FC2 SSF7
15MHz FC2 SSF7
10MHz FC2 SSF7
k b p s
TDD RL 15 DL Cell Throughput based on ISD Distance
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DL Cell Throughput to MAPL and Coverage basedon Special Sub-frame Configuration
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20 MHz FC1 SSF5
15MHz FC1 SSF5
10MHz FC1 SSF5
20 MHz FC2 SSF5
15MHz FC2 SSF5
10MHz FC2 SSF5
k b p s
TDD RL 25 DL Cell Throughput based on ISD Distance
k b p s
TDD RL 25 DL Cell Throughput based on ISD Distance
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20 MHz FC1 SSF7
15MHz FC1 SSF7
10MHz FC1 SSF7
20 MHz FC2 SSF7
15MHz FC2 SSF7
10MHz FC2 SSF7
k b p s
TDD RL 25 DL Cell Throughput based on ISD Distance
Comparison of
Frame Configuration 1 (FC2)Special Subframe Configuration (SSF)
5 and 7 Configuration
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UL/DL Cell Throughput Based on TDD Frame Type
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466 744 2049 11032
DL Frame Config 2
UL Frame Config 2
DL Frame Config 1
UL Frame Config 1 k b p s
Direct Comparison Frame Config 1 and 2at 20 MHz Special Subframe format 5
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Factors Affecting the Cell Capacity
• The LTE Cell Capacity (Throughput) depends on:
• Cell Range (Pathloss) – Considered as a variation of the Inter Site Distance (ISD)
– The effect of larger ISD has been presented in the previous slides
– The SINR distribution is bad in larger cells which becomes more & more noise limited
• Channel Bandwidth (1.4 MHz ... 20 MHz) –
The best capacity performance can be achieved with wide channel bandwidth due tothe maximum frequency diversity gain
– Small Bandwidth configuration are characterized by high system overhead
• Cell Load – The values presented so far are for 100% cell load
– The impact of cell load is based on simulation results
•LTE Features: – MIMO (Multiple Input Multiple Output)
– Beam Forming Single Stream
– Beam Forming Dual Stream
– Scheduling: Proportional Fair or Round Robin
See next slides for details
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Impact of Throughput based on frameconfiguration
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ISD [m] 1.4 MHz 3 MHz 5 MHz 10 MHz 15 MHz 20 MHz2Tx OLMIMO
Mode 3
2Tx CLMIMO
Mode 4
8Tx SS-LTBF
Mode 7
8Tx DS-HBF
Mode 8
500 0.78 1.04 1.16 1.20 1.22 1.23 20% 30% 34% 64%
1732 0.77 1.04 1.16 1.19 1.22 1.23 16% 24% 28% 56%
3000 0.88 1.08 1.18 1.21 1.24 1.25 10% 15% 18% 45%
9000 0.82 0.91 1.00 1.03 1.05 1.06 10% 15% 18% 45%
DL Spectral Eff iciency [b ps/Hz]
Beam Forming impact on capacity
• cell capacity sheet
–gain figures versus 1x2 SIMO
– basis
existing gain figure of 2x2 CL MIMO
relative cell average TP
updated: LTBF over 8 antennas (LTE493, RL15)
new: Hybrid BF (LTE541, RL25)
2x2 dynamic CL MIMO
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Spectral Efficiency