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© LS telcom AG 2002
Session 5.8
Supporting Network Planning Tools I
byRoland Götz
Spectrocan / LS telcom AG
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© LS telcom AG 2002
Modern Radio Network Planning Tools
Geo Information System
Data Management
Graphical User Interface
Propagation Prediction
Interference Analysis
Network Processor
Data / Result Output
Radio Network Planning ToolInterference Analysis
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Wantedfield strength F d
Coverage area
Locationof wanted TX
Noise
C/N
Noise level F N
Minimumfield strength F min
1. Criteria for coverage
Wanted Field Str. > Minimum Field Str.
NMNLK
min
Nd
FNCFF /+>
Interference Analysis
Interference by Noise
Minimum field strength (C/N):It is a minimum field strength level which is necessary to fulfil the signal quality for coverage.
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Wantedfield strength F d
Coverage areawith one
interfering Tx
Noise
C/N
Interferingfield strength F i
2. Criteria for coverage
Wanted Field Str. > Nuisance Field Str.
MLK
n
id
FAFF +>
Coverage areawith noise only
Protection ratio
Nuisance field F n Interference Analysis
Interference by one Transmitter
Nuisance field:Interference field strength at the reference point plus the protection ratio (C/I) required for the considered service.
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3. Criteria for coverage
Wanted Field Str. > Usable Field Str.
MLK
uF
M
j
nj
d FF ∑=
>1
F i1F i2
F d
Coverage areawith several
interfering Tx
Noise
C/N
Coverage areawith noise only
Protection ratioUsable field strength F u Interference Analysis
Interference by several Transmitter
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.
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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.
Procedures of Summation for Interference Calculation
Interference Analysis
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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
Non-statistical methods:
� Maximum procedure � Power-sum method
Statistical methods:
� Integration method� Log-normal method� Multiplication method� Simplified multiplication method� Simplified Log-normal method � Trilinear Log-normal method
Interference Analysis
Summation Procedures
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Frequency Scan
� 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.
Interference Analysis – Special Applications
Interference Analysis
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Modern Radio Network Planning Tools
Geo Information System
Data Management
Graphical User Interface
Propagation Prediction
Interference Analysis
Network Processor
Data / Result Output
Radio Network Planning ToolNetwork Processor
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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
Network Processor
Network Processor
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Principle of calculation: Combination of different results
BS1
BS2
BS1
BS2BS3
Result for BS 1Result for BS 1
Result for BS 2Result for BS 2
Result for BS 3Result for BS 3
Combined resultCombined result
BS3
Network Processor
Network Processor
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Maximum Field Strength:For every pixel, this plot shows the signal level of the cell/transmitter producing the maximum single field strength.
-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
-65 -80 -75
-65 -75 -70
-65 -70 -65
Sector 1
Sector 2
Sector 3
Max. Field.
Maximum Field Strength
Network Processor
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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.
-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
S3 x S2
S3 S2 S2
S3 S2 S2
Sector 1
Sector 2
Sector 3
Max. Server
Pmin= -75dBm
Network Processor
Maximum Server
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-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
S3 x S2
S3 x S2
S3 x S2
Sector 1
Sector 2
Sector 3
Best Server
Pmin= -75dBmC/Imin= 7 dB
Network ProcessorBest 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
Best Server
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Network Processor
Best Server
Maximum Server Best Server
Inte
rfere
nce
Interference
InterferenceInterference
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Network Processor
Network Processor Results
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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Allocation algorithm
Number of required carriersChannel constraints
Cell specific parameter Cell relationsFrequency spectrum
Network wide parameter
Channel allocation
Neighbour relationsChannel separation matrix
� LS Box algorithm� Simulated annealing algorithm
Network Processor – Advanced Analysis
Interference AnalysisInterference Matrix
Interference AnalysisAutomissed Frequency / Channel Assignment
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LivePlanning Tool Demonstration
„MULTIlink“Design Tool for Engineering Microwave Links
and PMP / WLL / LMDS Planning
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© LS telcom AG 2002
Modern Radio Network Planning Tools
Geo Information System
Data Management
Graphical User Interface
Propagation Prediction
Interference Analysis
Network Processor
Data / Result Output
Radio Network Planning ToolData / Result Output
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Planning Tool Database
ExportExport
ImportImport
Data / Result Output
Import and Export
•Import and Export of
Databases and Tables ( Sites, Antennas,…)Result FilesMeasurement Data
Should be possible in several formats (.txt, .xls, ASCII, .jpg, …)
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� Import measurement data� Analogue� Digital� BER
� Evaluation of measurement data� Rohde&Schwarz,� Alcatel, Ericsson TEMS, generic ASCII
� Plotting of measurement data� Calibration
� Path loss fit� Calibration of extended OH model
Data / Result Output
Example: Measurement Data
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� Application specific frame
� Legend
� Print in specific map scale
� Specify margins and borders
� Multiple printing
� Support various paper sizes
� Add site specific information
Print Process Preview
Data / Result Output
Printing of Maps and Result Plots
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indoor urban
indoor suburban
outdoor rural
outdoor urban
Region of your networkCurrent network coverage
Now, we want to improve the coverage in this region.
Network Processor
Example: Coverage Optimisation GSM Network
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Candidate Steffisburg ANetwork Processor
Example: Coverage Optimisation GSM Network
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Candidate Steffisburg BNetwork Processor
Example: Coverage Optimisation GSM Network
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Candidate Steffisburg CNetwork Processor
Example: Coverage Optimisation GSM Network
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Direct comparison of the three alternative site positions
Selection of Candidate Steffisburg C
Network Processor
Example: Coverage Optimisation GSM Network
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Previous coverage Improved coverageNetwork Processor
Example: Coverage Optimisation GSM Network
indoor urban
indoor suburban
outdoor rural
outdoor urban
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© LS telcom AG 2002
SoftwareTools
EngineeringServices
TrainingConsultancy
Solutions for Spectrum Management, GSM900, GSM1800, Microwave Links, PMP, LMDS, Radio/TV Broadcast, DVB, DAB, Trunked Radio, TETRA, Paging, Satellite Services
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