Session 5.8
Supporting Network Planning Tools I
by
Roland Götz
Spectrocan / LS telcom AG
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© LS telcom AG 2002
Modern Radio Network Planning Tools
Radio Network Planning Tool
Interference Analysis
Data / Result Output
Network Processor
Interference Analysis
Propagation Prediction
Graphical User Interface
Data Management
Geo Information System
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Interference by Noise
Interference Analysis
Wanted
field strength F d
Minimum
field strength F min
Noise level F N
C/N
Noise
Minimum field strength (C/N):
It is a minimum field strength level
which is necessary to fulfil the signal
quality for coverage.
1. Criteria for coverage
Location
of wanted TX
Wanted Field Str. > Minimum Field Str.
N
Fd > F
N
KN+LCN/M
F min
Coverage area
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Interference by one Transmitter
Nuisance field F n
Wanted
field strength F d
Interference Analysis
Protection ratio
Interfering
field strength F i
Nuisance field:
Interference field strength at the
reference point plus the protection
ratio (C/I) required for the considered
service.
C/N
Noise
Coverage area
with noise only
Coverage area
with one
interfering Tx
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2. Criteria for coverage
Wanted Field Str. > Nuisance Field Str.
i
Fd > F
+M
A
KL
Fn
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Interference by several Transmitter
Usable field
strength F u
Fd
i
F
2
C/N
Noise
Coverage area
with noise only
Interference Analysis
Protection ratio
i
F
1
Usable field:
Summation of the nusiance fields of the
interfering tansmitters according to a
certain summations algorithm (maximum,
simplified multiplication, ...)
It is the fieldstrength value which is
usable by a possible new site just to fulfill
the condition of coverage (C/I>0) by the
existing interferer situation.
3. Criteria for coverage
Wanted Field Str. > Usable Field Str.
Fd >
M
∑ F jn
=1
K
LM
j
Coverage area
with several
interfering Tx
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Fu
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Procedures of Summation for Interference Calculation
Interference Analysis
In modern Planning Tools, the cumulation of the single interfering
fields can be done in several different ways.
The various procedures differ in the way how simplifications are used
to minimize the calculation effort.
In the following a short overview is given for the procedures which
are most often used in interference calculations.
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Summation Procedures
Non-statistical methods:
Maximum procedure
Power-sum method
Statistical methods:
Interference Analysis
Integration method
Log-normal method
Multiplication method
Simplified multiplication method
Simplified Log-normal method
Trilinear Log-normal method
Most use is made of the power-sum method and the
simplified multiplication method
Reference CCIR Report 945-2: Methods for the Assessment of Multiple Interference
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Interference Analysis – Special Applications
Frequency Scan
Interference Analysis
This function is used to find out gaps in the frequency spectrum where new TV or FM
transmitters could be planned. At a desired transmitter site (transmitter coordinate) a
wanted transmitter calculation based on a frequency range given by the user is done
and the usable field strength calculated for each frequency point.
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Modern Radio Network Planning Tools
Radio Network Planning Tool
Network Processor
Data / Result Output
Network Processor
Interference Analysis
Propagation Prediction
Graphical User Interface
Data Management
Geo Information System
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Network Processor
Network Processor
The Network Processor
• produces network-wide results out of the single-cell-based results
• allows to analyse the radio network
• allows to simulate changes of the network parameter
• allows to simulate changes of the network design
• allows to optimise the radio network
• allows to plan the future roll-out phases
• produces statistics on the selected results
Each Service needs an own service-specific Network Processor
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Coverage of Single Sectors
Network Processor
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Network Processor
Network Processor
Principle of calculation: Combination of different results
BS1
BS2
Result
Resultfor
forBS
BS11
Result
Resultfor
forBS
BS22
BS3
Result
Resultfor
forBS
BS33
BS3
BS2
BS1
Combined
Combinedresult
result
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Maximum Field Strength
Network Processor
Maximum Field Strength:
For every pixel, this plot shows the signal level of the cell/transmitter
producing the maximum single field strength.
Sector 1
Sector 2
Sector 3
Max. Field.
-120
-128
-130
-120
-127
-129
-115
-118
-121
-95
-80
-75
-65
-80
-75
-90
-75
-70
-65
-75
-70
-85
-70
-65
-65
-70
-65
-65
-80
-95
-65
-80
-95
-65
-75
-95
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Maximum Field Strength
Network Processor
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Maximum Field Strength (Network)
Network Processor
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Maximum Server
Network Processor
Maximum Server:
The maximum server plot shows, for a certain pixel, the name of the transmitter
featuring the maximum signal; its field strength must exceed the minimum field
strength required for coverage, Emin equiv.
Sector 1
Sector 2
Sector 3
-120
-128
-130
-120
-127
-129
-115
-118
-121
-95
-80
-75
-90
-75
-70
-85
-70
-65
-65
-80
-95
-65
-80
-95
-65
-75
-95
Max. Server
Pmin= -75dBm
S3
x
S2
S3
S2
S2
S3
S2
S2
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Maximum Server
Network Processor
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Maximum Server (Network)
Network Processor
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Best Server
Network Processor
Best Server:
The maximum server plot shows, for a certain pixel, the name of the transmitter
featuring the maximum signal; its field strength must exceed the minimum field
strength required for coverage, Emin equiv and the Minimum C/I
Sector 1
Sector 2
Sector 3
-120
-128
-130
-120
-127
-129
-115
-118
-121
-95
-80
-75
-90
-75
-70
-85
-70
-65
-65
-80
-95
-65
-80
-95
-65
-75
-95
Best Server
Pmin= -75dBm
C/Imin= 7 dB
S3
x
S2
S3
x
S2
S3
x
S2
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Best Server
Network Processor
Best Server
Interference
Maximum Server
Interference
Interference
Interference
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Best Server (Network)
Network Processor
Maximum Server
Best Server
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Network Processor Results
Network Processor
Many other service-specific results can be processed by a
powerful Network Processor, like:
• Number of Max Sever
• Number Best Server
• Strongest Interferer
• Level of Strongest Interferer
• Coverage Probability
• Coverage Reserve
• Power Difference
• Assignment Probability
• Handover Zone
• Requeired Channels
• Coding Sheme Area (GPRS)
• SFN Level Gain
• ...
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Network Processor – Advanced Analysis
Automissed Frequency / Channel Assignment
Network wide parameter
Frequency spectrum
Cell specific parameter
Interference Analysis
Cell relations
Number of required carriers
Channel constraints
Neighbour relations
Channel separation matrix
Interference Analysis
Interference Matrix
Allocation algorithm
Channel allocation
© LS telcom AG 2002
LS Box algorithm
Simulated annealing algorithm
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Live
Planning Tool Demonstration
„MULTIlink“
Design Tool for Engineering Microwave Links
and PMP / WLL / LMDS Planning
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Modern Radio Network Planning Tools
Radio Network Planning Tool
Data / Result Output
Data / Result Output
Network Processor
Interference Analysis
Propagation Prediction
Graphical User Interface
Data Management
Geo Information System
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Import and Export
Data / Result Output
•Import and Export of
Databases and Tables ( Sites, Antennas,…)
Result Files
Measurement Data
Should be possible in several formats (.txt, .xls, ASCII, .jpg, …)
Planning Tool
Database
Export
Export
Import
Import
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Example: Measurement Data
Import measurement data
Analogue
Digital
BER
Evaluation of measurement data
Data / Result Output
Rohde&Schwarz,
Alcatel, Ericsson TEMS, generic ASCII
Plotting of measurement data
Calibration
Path loss fit
Calibration of extended OH model
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Printing of Maps and Result Plots
Data / Result Output
Print Process Preview
Application specific frame
Legend
Print in specific map scale
Specify margins and borders
Multiple printing
Support various paper sizes
Add site specific information
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Printing of Database Lists
Data / Result Output
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Example
Network Optimization
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Example: Coverage Optimisation GSM Network
Regionnetwork
of your network
Current
coverage
indoor urban
Network Processor
Now, we want to
improve the
coverage in this
region.
indoor suburban
outdoor urban
outdoor rural
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Example: Coverage Optimisation GSM Network
Network Processor
Candidate Steffisburg A
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Example: Coverage Optimisation GSM Network
Network Processor
Candidate Steffisburg B
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Example: Coverage Optimisation GSM Network
Network Processor
Candidate Steffisburg C
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Example: Coverage Optimisation GSM Network
Network Processor
Direct comparison of the three alternative site positions
Selection of Candidate Steffisburg C
© LS telcom AG 2002
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Example: Coverage Optimisation GSM Network
Network Processor
Previous coverage
Improved coverage
indoor urban
indoor suburban
outdoor urban
outdoor rural
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Is there anything else we can do for you?
Software
Tools
Engineering
Services
Training
Consultancy
Solutions for Spectrum Management, GSM900, GSM1800, Microwave Links, PMP, LMDS,
Radio/TV Broadcast, DVB, DAB, Trunked Radio, TETRA, Paging, Satellite Services
© LS telcom AG 2002
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LS telcom AG
Roland Götz
Member of the Board
rgoetz@LStelcom.com
Im Gewerbegebiet 31-35
D- 77839 Lichtenau
Germany
Phone: +49 7227 9535 700
Fax:
+49 7227 9535 702
www.LStelcom.com
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