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:   Info@SmartTECH-Optimization.com 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: info@besttrainings.ruWEB:  http://www.besttrainings.ru  

Troubleshooting