Date post: | 14-Oct-2014 |
Category: |
Documents |
Upload: | nitin-agarwal |
View: | 185 times |
Download: | 5 times |
release 05/09
RAN network optimization
Node B
RADIO ACCESS NETWORKRADIO ACCESS NETWORKOPTIMIZATIONOPTIMIZATION
… for 3G/3G+ - Presentation May 2009 -
RAN parameter improvement & KPI analysis …
release 05/09
RAN network optimizationTarget
Operator/customer
Network optimization
Node B
Signalling KPISignalling KPI RAN KPIRAN KPI
Multi vendornetworks
with probe equipment of different vendor
solutions …
release 05/09
RAN network optimization
IuB
KPI and counter analysisKPI and counter analysis
KPI improvementsVendor benchmark
Network tuningNetwork tuning- SWAP/Upgrade- Roll outby low drive test efforts
with RAN equipment of different vendor
solutions …
release 05/09
RAN network optimization
• Drive test not necessaryDrive test not necessary (UE becomes test equipment)(UE becomes test equipment)• 300 …1200 cells checked in several hours300 …1200 cells checked in several hours• RF and signalling analysis benchmark with vendor countersRF and signalling analysis benchmark with vendor counters• Counter and KPI tuning (fault analysis)Counter and KPI tuning (fault analysis)• Signalling and RAN analysis in one step (more reliability) Signalling and RAN analysis in one step (more reliability) • Improvement of capacity, coverage, and throughputImprovement of capacity, coverage, and throughput• More soft capacity, due to interference reductionMore soft capacity, due to interference reduction
IuB
KPI and counter analysis at IubKPI and counter analysis at Iub
Centralize trouble Centralize trouble shouting at RNCshouting at RNC
by probe by probe monitoring (DNA/monitoring (DNA/
NSA)NSA)
Customer benefits
release 05/09
RAN network optimization
RAN – Parameter analysisFault diagnostics/cell level
Performance & counterbenchmark-neutral/NSN
IuB
Counter evaluation (RU10)
Customer benefits (example)
TECHtrace analysis & DNA monitoring
• RRC connection set up failureRRC Connection is rejected
WBTS reports problem setting up Radio Link
NBAP: Radio Link Setup Failure
M1005C0 SETUP_FAIL_FIRST_RL_RNL(Radio Network Layer)M1005C177 SETUP_FAIL_FIRST_RL_TRL (transmission layer)M1005C178 SETUP_FAIL_FIRST_RL_PROTM1005C179 (Channel Elements)SETUP_FAIL_FIRST_RL_MISC(Channel Elements)Counters are incremented in case of RRC Connection Setup or state transition to Cell_DCH
M1005C0 SETUP_FAIL_FIRST_RL_RNL(Radio Network Layer)M1005C177 SETUP_FAIL_FIRST_RL_TRL (transmission layer)M1005C178 SETUP_FAIL_FIRST_RL_PROTM1005C179 (Channel Elements)SETUP_FAIL_FIRST_RL_MISC(Channel Elements)Counters are incremented in case of RRC Connection Setup or state transition to Cell_DCH
release 05/09
RAN network optimizationTop 10 performance issues
Node B
OPEXOperations, maintenanceOperations, maintenance
(Min/reduction)(Min/reduction) Drive tests, tools Drive tests, tools Customer complainCustomer complain HW/SW fault managementHW/SW fault management Service effortsService efforts
CAPEX/OPEXNetwork parameter Network parameter
performance performance QoS requirements Ec/IoQoS requirements Ec/IoCapacity improvementsCapacity improvementsCoverage improvementsCoverage improvementsSoft capacity Soft capacity
CAPEX/OPEXService performanceService performance
Site survey & # sitesSite survey & # sitesTraffic recourses Traffic recourses /cell&NW/cell&NWservice level statusservice level statusFuture enhancementsFuture enhancements
KPIKPIInterference and CDR Interference and CDR impacts due to:impacts due to:
Permanent high interfered Permanent high interfered cells (bad cells)cells (bad cells)
Cells with high fading Cells with high fading pollutionpollution
coverage holes (RSCP coverage holes (RSCP reporting required ) reporting required )
Interference and CDR Interference and CDR impacts due to:impacts due to:
SHO probability – cell SHO probability – cell overlapping overlapping
total network Interference total network Interference level (RNC PAR upgrade)level (RNC PAR upgrade)
capacity & throughput/cell capacity & throughput/cell
CDR and traffic performance CDR and traffic performance impacts due to:impacts due to:
traffic/ Erlang/CH elementstraffic/ Erlang/CH elements traffic utilisation traffic utilisation potential user servicespotential user services NRT throughput/cell NRT throughput/cell
KPIKPI KPIKPI
release 05/09
RAN network optimizationKey Performance Indicators – challangeCounter Unit Special requirementsEc/I0 dB
RSCP dBm RSCP reporting
Little i - Maximum power Pmax for each cell in WCPICH power PCPICH for each cell in WIn case of RSCP reporting UE receiver noise NUE in W
Propagation delay
chips
TCP % of Pmax
RTWP dBmEvent types VendorRRC connection request Any
1a, 1b, 1c Any
1e, 1f NSN
2d, 2f Ericsson
release 05/09
RAN network optimizationKey Performance Indicators - methods
Determination of counters Ec/I0
Event Method
RRC connection request
Extracted from actual protocol message
1a, 1b, 1c Extracted from actual protocol message
1e, 1f Extracted from actual protocol message
2d, 2f Extracted from previous report (2d, 2f itself does not contain Ec/I0)
RSCP
Event Method
RRC connection request
Extracted from actual protocol message
1a, 1b, 1c Extracted from actual protocol message
1e, 1f Extracted from actual protocol message
2d, 2f Extracted from previous report (2d, 2f itself does not contain RSCP)
Addition/Drop Window setting and size (dB)
release 05/09
RAN network optimizationKey Performance view: User & network
Service selection Name
All services ALL
Signaling only SIG
Voice and streaming only RT
Interactive and background only
NRT
UE or network view selection
View Name
UE view UE
network view (cell matrix) NET
In case of UE view, the best active cell listed by an report is considered only. In case of network view, all active cells are considered.
release 05/09
RAN network optimizationNetwork view – signalling performance of cells
release 05/09
RAN network optimizationCell matrix: best cells & best candidates
release 05/09
RAN network optimizationAir Interface view – events – calls - signalling
release 05/09
RAN network optimizationExport of datas … csv, EXCEL, graphics & Ec/Io vs. time
release 05/09
RAN network optimizationNetwork view – Ec/Io over RSCP within cell (propagation, distance)
Break point for SHO areaBreak point for SHO area
release 05/09
RAN network optimizationTop 3 drivers – interference scattering – cell overlap - traffic
Reference Par.Reference Par.
IDR/ σNo default(ReferenceNetwork)
Non-vendor
IDR (i)/throughput
Default 0.6
vendor
Load/Traffic Erlang
N 40 …45 vendor
RT/NRT service
Reference Par.Reference Par. Reference Par.Reference Par.
Key Performance IndicatorsKey Performance Indicators
release 05/09
RAN network optimization
RNC mapping/monitoring - TECHtrace
Procedures, hands-onRNC
Small cap <600 carrier
RNCMedium cap<1000 carrier
RNCHigh cap
<1200 carrier
diagnostic per RNC up to cell level
Cell specific fault indicators (DCR, PwR etc.)
Automatic hands-on recommendation (next releases)
Node B
Interference Related Disturbance Ratio i SHO and HHO
Probability
Strongly Interfered and Unstable Cells
Quality Difference Serving – Adjacent Cell (cell matrix)
capacityperformance
Fault analysis
Antenna TiltingThresholdsDirty surfacesHW faults
Benchmark With RAN par./counters/
drive testsFault analysis Fault analysis
release 05/09
RAN network optimizationNext steps
Next release features:• Geo data map & user allocation (location service)• Orthogonality detection (CE improvements)• Add/ drop window set size improvements• HHO / inter- RAT improvements• HSPA PwR management detection• Throughput / load detection for potentials of coverage/cap.
Under construction• Real-time diagnostic for quick fault detection.Real-time diagnostic for quick fault detection.• Automatic fault analysisAutomatic fault analysis
with counter evaluation
release 05/09
RAN network optimizationChallenge: Location services (LS)
Interference detection, load management within networks
Cell coverage
cell coverage plus load
Interference (dBm)
Broadcastpilot
Isolate cell load from Interference of neighbours
Geographical shaping analysislimits by propagations
Hints:• UMTS is event based triggered • CPICH Ec/Io parameters consider load and fading• Ec/Io range is too low (25 dB scale values)• LNF/ Rayleigh fading destroys stochastic (derivation too
high)• RSCP/CPICH is not cyclic transmitted (RAS 6.0/RU10)• Propagation Delay (PD), 260 ns/symbol = 80 m/chip• Multipath limits distance calculations due to fast fading
but more stable against micro cells comparing macro cell
release 05/09
RAN network optimizationNext release features:• Geo data map & user allocation (location service)
Implementation of interference Map (IDR) UE detection within cells
Individual geographic allocation of UEs within cell areas: Monitoring of Iub/Iu protocol traffic/load. The desired accuracy is +/-100m, but shall not be worse than +/- 200m in any geographical dimension. It must be possible to obtain the geo location information in near real-time
Cell Map next release
Via MAP info:• Ec/Io, IDR (i), • RSCP, • UE servicedistribution within cells
release 05/09
RAN network optimization
Operator/customer
Network optimization
e.g. Net act
Vendor technologies
Node B
monitoring – SW/probes(vendor independent)
Business value driversBusiness value driversCDR (radio and core dropped services)
Call success rate (overall network service performance Blocking Rate (initial access performance)
Combining/matching of vendor specific issues with smartTECH & probe tools …
provided by TECHCOM
partners
release 05/09
RAN network optimizationFlexible - experienced - quick
partners launch
technologies &
consultingproducts
in time to markets
Companies & contact
Please contact: Service providerService providerSmarttech GmbHD-82041 Oberhaching / Munich
phone: +49-89-638-488-0fax: +49-89-638-488-99
e mail: [email protected] WEB: SmartTECH-Optimization.com
Partner in Russia, CIS and Baltic Partner in Russia, CIS and Baltic countriescountriesCTS MialComRussia, Moscow
phone +7 916 063 1105 e mail: [email protected]: http://www.besttrainings.ru
Troubleshooting