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02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers1
RNO - Radio Network Optimization
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers2
NCS/NOX NCS/NOX FAS/FOX FAS/FOXTET TET MRR MRR
R-PMO R-PMO
NWS-A NWS-A NWS-A
MTRCTRCER
RNO
Planning Tuning Troubleshooting
R-PMO
PMR
NWS
Network optimization tools
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers3
RNO - Common Structure
ReportsExport
BSC
RNO Applications
CNA SDM
Recording Definition
RecordingData
CountersChangeOrder
Implemen-
tation
DataCollection
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RNO - System Parameters
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers5
Recording Session
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Radio Statistics based on Mobiles measurement reports
MRR - Measurement Result Recording
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Supervision
NetworkPerformance
Implementation
CNA
Verification
Compare Radio Characteristics
before and after change of parameters
Analysis
Signal Strength
Signal Quality
Ms Power level
BTS Power Reduction
Timing Advance
(Path loss)
MRR - Optimization
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers8
• Bad speech quality
• Interference detection
• Tuning of HCS parameters
• Cell covers to much
MRR - Example of usage
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The cell carries traffic for TA=32. Check if this is consistent with cell plan (map)
Cell covers too much (TA - recording)
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers10
• Signal Strength, Uplink and Downlink (-47 < Rxlev< -110 dBm)
• Signal Quality, Uplink and Downlink (0< RxQual < 7)
• MS Power Level (0-39 dBm)
• BTS Power Reduction (0, -2, -4, ……-28, -30 dB)
• Timing Advance (0-127 GSM??)
• (Path Loss, Uplink and Downlink)
MRR - Measured Radio Characteristics
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MRR - Important Recording Parameters
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MRR - Reports
• Overview Report
• Overview Histogram
• Cell Histogram
• Trend Report
• Top Ten Chart
• Comparison Report
• Cell Comparison Histogram
• Comparison Chart
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers13
MRR - Overview Histogram
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Finding the Effects of a Change
Order a recording for the
area of the network
that will be changed
Switch on, for instance,
DTX in the BSC
Order a new Recording
after one or a few days
Open the Comparison Report check if Quality and
Performance have improved
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers15
NCS/NOX - Neighbouring Cell Support/eXpert
Find missing
neighbour relations
Find unnecessary neighbour cell relations
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers16
Supervision
HO attempts
-success rate
-reversions
-failures
Implementation
CNA
Verification
Improved Handover statistics
Analysis
Ranking of
HO candidats
Compare defined NR
with Test frequencies
NCS/NOX - Optimization
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers17
• Find new Neighbour Relations
• Remove unnecessary Neighbour Relations
• (Areas with no dominant server)
• (Adding a new cell)
NCS/NOX - Examples of usage
“Circle of death”
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers18
NCS - Important Recording Parameters
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Active BA-list Recording
Serving Cell
BCCH 35BSIC 12
BCCH 35BSIC 12
BCCH 37BSIC 23
BCCH 37BSIC 23
Undefined Neighbour Cell
Defined Neighbour Cell
Transmit Active BA-list(35, 37, 33)
Mobile listen for BCCH 35, 37, 33
BSCBSC
BCCH 33BSIC 17
BCCH 33BSIC 17
Test frequency
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers20
Recording Session
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Measuring cell
Measured Data
RxLev = -85 BSIC = 12BCCH = 65
BSIC/BCCH = 12/65
BSIC/BCCH = 12/65
BSIC/BCCH = 12/65
NCS/NOX - Finding probable cell
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• Overview Report
• Cell Report
• Detailed Cell Report
• Cell Report Chart
• Change Order
• Probable Neigbouring Cell Report
NCS - Reports
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NCS - Cell Report
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NCS - Change Order
NCS Cell Report
NCS Change order
Cell ACell BCell X
Add Neighbour toChange order Export to CNA
planned area
Update network
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers25
NOX - Neigbouring cell list Optimization eXpert
Recording
Recording
Reallocation AlgorithmReallocation Algorithm
Implemen-tation
Implemen-tation
Recommended Change Order
Recommended Change Order
CNACNA
Recommendation Mode
NCS-recordingNCS-recording
-Data from BAR-recording-Handover statistics-Network data-Parameters of the reallocation algorithm-Barring Matrix
Automatic Mode
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Recording Session - Recommended or automated mode
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• Change Order Recommendation
• Change Order Evaluation
• (Reallocation Log)
NOX - Reports
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NOX - Change Order Recommendation
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers29
FAS/FOX - Frequency allocation support/ eXpert
Interference Signals on the uplinkInterference Signals on the uplink
Interference Signals on the downlinkInterference Signals on the downlink
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers30
Supervision
Interference level
Drop rate
Speech Quality
Implementation
CNA
Verification
Compare Interferenceafter change offrequency plan
Analysis
UL: Interference
distribution
DL: ICDM, PIT
FAS/FOX - Optimization
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers31
• Identify bad BCCH/TCH frequency
• Detect external interference
• (Antenna in wrong direction)
• (Areas with no dominant server)
FAS/FOX - Examples of usage
KJ
L
XHG
I
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers33
FAS/FOX
How to see uplink How to see uplink Interference ?Interference ?
• TRX measures the uplink interference repeatedly on configured and test frequencies
• Samples every 15 sec
• Use RIR function in BSC
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers34
No of Samples
Interference (dBm)
50 th percentile (median)
I= -105 dBm I= -75 dBm
90 th percentile
Percentile: Tells the value I dBm below which x% of the samples fall x th percentile
I (dBm)
Distribution of uplink interference
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers35
FAS/FOX
How to see downlink How to see downlink Interference ?Interference ?
• Measurement Reports from MS on configured and test frequencies are collected
• ICDM & PIT are computed to give estimation of downlink interference
• Use BAR function in BSC
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers36
Interference
9600143
dB
A
C
Carrier, f1CA
<0 dB
Distance
Adjacent, f2f2 = f1 ± 200 kHz
Co-channel
9600142
dB
C
I
Carrier, f1
CI
>0 dB
Distance
Interferer, f1
Adjacent channel
C/I > 9 dB (GSM specification)
C/I > 12 dB (Ericsson recommended)
C/I > 9 dB (If Fq. hopping is used)
C/A > -9 dB (GSM specification)
C/A > 3 dB (Ericsson recommended)
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FAS - Important Recording Parameters
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• Overview Report
• Cell Report
• Cell Report Chart
• Overview Comparison Report
• Cell Comparison Report
• UL Data Validity Report
FAS - reports
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FAS - Cell Report
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• Shows how much one specific cell interferes other cell
• ICDM is used to compute PIT values
• ICDM can be imported to TCP to simulate downlink interference instead of predicted data
ICDM - Inter Cell Dependency Matrix
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers41
• ICDM Report
• ICDM Validity Report
• ICDM Probable Interfering Cell Report
FAS - ICDM reports
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• Estimation of downlink interference
• Calculated for all frequencies in all cells
PIT - Percentage Interfered Traffic
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers43
FOX - Frequency Optimization eXpert
Recording
Recording
Reallocation AlgorithmReallocation Algorithm
Implemen-
tation
Implemen-
tation
Recommended Change Order
Recommended Change Order
CNACNA
Recommendation Mode
FAS-recordingFAS-recording
Automatic Mode
02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers44
FOX - Reallocation Search Settings
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FOX - Reallocation algorithm step 1
TentativeSuggestions
AAAAA
BBBBB
FFFFFF
TTTTTT
XXXXXX
ZZZZZZ
AAAAA
BBBBB
FFFFFF
TTTTTT
XXXXXX
ZZZZZZ
PPPPPP
UL DataReliability
TTTTTT
AAAAA
FFFFFF
BBBBB
AAAAA
BBBBB
FFFFFF
TTTTTT
XXXXXX
Same freqset check
Check forhalted cells Prioritize
AAAAA
BBBBB
FFFFFF
TTTTTT
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FOX - Reallocation algorithm step 2
TTTTTT
AAAAA
FFFFFF
BBBBB
Start with first freq in prioritized list
Same frequency
check
Barring &spacing check
Overall PITreduction check
List empty?RecalculatePIT
Finished
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• Change Order Recommendation
• Change Order Evaluation
• Reallocation Log
FOX - Reports
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FOX - Change Order Recomendation
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TET - Traffic Estimation Tool
????Hot Spot Finder
Off-load
Off-loadOff-load
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TET - Important Recording Parameters
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TET - Reports
• (Open Report)
• Overview Report
• Traffic Level and Off-Load Report
• Traffic Level Chart of Surrounding Cells Report
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