LTE Planning and ion
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Transcript of LTE Planning and ion
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LTE Radio Planning and Optimisation
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Contents
� LTE Radio Planning Basics
� LTE Link Budgets
� LTE Capacity Planning
� Optimisation Introduction
� Self Organising Network Concepts
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Radio Planning Basics
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High Level Design Life Cycle
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3
How many eNBs tosatisfy objectives?• Capacity• Coverage
How many sitesavailable?
Objectives satisfiedwith available sites?
Pre-Build OptimisationEnsure CAPEX Efficiencyand optimal performance
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Information Required – Phase 1
Generally Known Data
� Frequency Band
� Amount of Allocated Spectrum
� Channel Bandwidth
� Equipment Performance
Market Research Data
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4
Market Research Data
� Service Area
� Population Density
� Population Demographic
� Population Penetration
� Expected level of service
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LTE Link Budgets
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Link Budget :– System Gain
TxPA
LF+C
GAnt
GDiv
EiRP
GAnt
Sys Gain
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UEIRLmin
LF+C
GAnt
Rxth
Sys GainUL = (TXPAUE + GAntUE) – (RxTHeNB + LeNB – GANTeNB – GDiv)
Sys GainDL = (TXPAeNB – LeNB + GAnteNB + GDiv) – (RxTHUE – GANTUE – GDiv)
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Link Budget : – MAPL, Spending the Budget
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Sys G
ain MAPL Distance
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Sys G
ain
Fade Margin 8 – 12 dB
Building Margin 5 – 30dB
Body Margin 0 – 3 dB
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Using MAPL to Find Distance
Propagation
MAPL
FrequencyHeight
Antenna
Height
Clutter Terrain
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PropagationModel
Clutter Terrain
Distance
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Performance KPIs
Noise and Interference
Signal Strength
64QAM 16QAM QPSK
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64QAM 16QAM QPSK
• Cell Edge Throughput• RSRQ• RSRP• RSSI• SNR• Area Availability• Cell Edge Availability
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Defining RSRP, RSSI and RSRQ
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LTE Resource BlockRs
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Rs
Rs
Rs
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UE Radio Measurements
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RSRP and RSRQ Targets
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LTE Capacity Planning
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Capacity in LTE
� LTE supports Adaptive Modulation and Coding
� Actual Capacity will depend on users location in the cell
� SINR is the most important planning KPI
� Average cell throughput will lower than quoted
maximums
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The Capacity Planning Problem
100+ Mbps!Assumes good radio signal in
every part of the radio cell
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QPSK16QAM64QAM
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User Distribution in the Cell
� User Distribution will impact average cell throughput
� The resource scheduler in the eNB is very important
� Scheduling may be different between vendors
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QPSK16QAM64QAM
~10% of Area
~15% of Area
~75% of Area
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Average Cell Throughput
Mbps
Lower Average
Due to resource sharing
Between many users
Higher Peak Loads
due to less active users
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Average Busy Hour
Throughput
Average Non-Busy Hour
Throughput
time
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Capacity Modelling
� Try to Determine what data the typical user will consume
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Capacity Modelling cont.
� Extrapolate consumption between subscriber population
� Make assumptions about “busy period” to obtain Data
Density
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Capacity Modelling cont.
� Use Link Budget and Sector Throughput to determine
number of radio cells
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Optimisation Introduction
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Optimisation Context
1
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Optimisation Targets
� Cell Edge Throughput 5-10Mbps
� RSRQ -7dB
� RSRP -75dB
� SNR >13dB
� Area Availability 90%
� Cell Edge Availability 75%
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� Cell Edge Availability 75%
� RF Optimisation Options
– Antenna Orientations, Tilt, Azimuth
– Transmit Power
– Antenna Height
– eNB Location
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Mobility Optimisation� Initial Cell Selection
UE
Qrxlevmeas
Low QrxlevminQminoffset
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High QrxlevminQminoffset
Srxlev = Qrxlevmeas – (Qrxlevmin+ Qrxlevminoffset) - Pcompensation
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Cell Reselection
Sintrasearch
Snonntrasearch
No
Se
arc
hLT
E S
ea
rch
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IRA
T S
ea
rch
Rs = Qmeas_s +QhystRn = Qmeas_n + Qoffset
Rn > Rs > Treselection
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Other Mobility Considerations� IRAT Cell Reselection Decisions
UE
LTE
UMTS
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GERAN
• Measurement Thresholds
• Cell Priority
• Mobility Offset/Hyst
• Mobility Status (speed)
• Cell Ranking
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Other Mobility Considerations :- Handovers� LTE and IRAT Handovers
UE
LTE
UMTS
• Measurement/
Reporting
Thresholds
• Cell Priority
• Mobility
Offset/Hyst
• Mobility Status
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GERAN
(speed)
• Cell Ranking
• eNB makes H/O
Decision
• H/O Algorithm
Vendor/ Operator
Controlled
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Self Organising Network Concepts
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Optimisation for Future Deployments
� Self Organising/Optimising Networks
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SON Release 8
� Automatic Inventory
� Automatic Software Download
Focus is on initial equipment installation and integration
eNB Self Configuration
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� Automatic Neighbour Relation
� Automatic Physical Cell ID assignment
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SON Release 9
� Mobility Robustness/Handover optimization
� RACH optimization
Provides SON functionality covering operational aspects
of already commercial networks, in particular key aspects
related to network optimization procedures.
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� RACH optimization
� Load Balancing optimization
� Inter-Cell Interference Coordination
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SON Release 10
� Coverage & Capacity optimization
� Enhanced Inter-Cell Interference Coordination
Cell Outage Detection and Compensation
Provides a richer suite of SON functions for macro and
metro networks overlaid on and interoperating with existing
mobile networks.
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� Cell Outage Detection and Compensation
� Self-healing functions
� Minimization of Drive Testing
� Energy Savings
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SON Architecture
� Centralised SON� A centralized architecture approach can be used for deploying real-time
SON functions, such as Automatic Neighbor Relations and Automatic
Physical Cell ID.
� The OAM must also handle large amounts of data in order to make the
localized SON decisions across the network
� Multi-Vendor support may be difficult
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EPC
eUTRAN
eUTRAN
eUTRAN
OAM
SON
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SON Architecture
� Distributed SON� The distributed architecture leverages smart, autonomous network elements
with local SON decision making
� This reduces the complexity, footprint and availability requirements of the
OAM
� X2 requirements are more complex
� Easier in a multi-vendor system
SONSON
34
EPC
eUTRAN
eUTRAN
eUTRAN
OAM
SONSON
SONSON
SONSON
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SON Architecture
� Hybrid SON� More complex solution
� OAM can make long term optimisation decisions and eNB can deal with the
real time optimisation of load and interference
� Should be possible to build effective systems in a multi-vendor system
SONSON
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EPC
eUTRAN
eUTRAN
eUTRAN
OAM
SONSON
SONSON
SONSON
SON
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LTE Training:- Telecoms Academy
� Visit Helen Robinson on Stand 23
� LTE Technical and non-Technical Overviews
� LTE Radio Planning and Optimisation
� LTE Core Network Planning and Dimensioning
� eUTRAN Protocols and Signaling
36
� eUTRAN Protocols and Signaling
� LTE and IMS
� miniMBA with LTE Focus
� Distance Learning Course with LTE focus