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Training on 3G/HSPA Design:

Design Thresholds, KPIs & Targets

KPI Classification and Management E2E KPIs – Peak, Average, Cell-Edge Performance Network Counter Assessment Street Level Design Threshold

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KPI Classification

KPI Categories

Rollout KPIs E2E KPIs Statistical KPIs Prediction KPIs

UTRAN Statistical E2E KPIs

Coverage E2E KPIs

Coverage Related

Installation Related

Coverage KPIs

Capacity KPIs

CS-Related

UMTS

HSPA

Tool based calculations toassess rollout progress &network buildtracking

Measurementsin real network tooptimise and/orto assess customerexperience

Network counteranalysis to tracknetwork stability,access-ability, performance,utilisation

Tool basedcoverage/quality/performance analysis to visualiseexpected or plannedcoverage, e.g. fixdrive test route

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KPI Management

T0 Start of site installation

T1 End of site installation

T2 Ready for acceptance

Optim. Period

Weekly reporting 14 days reporting

Acceptance period

Monthly reporting

Site installation period

KPI focus to status of network build and operation

Example:

Focus to rollout &prediction KPIs

Focus to rollout &prediction KPIs,E2E testing foroptimisation

Focus E2E testing foroptimisation and networkcounters to assess networkquality

E2E testing andnetwork coutersto verify customerexperience andnetwork quality/performance

Usualy different targets are applied to stages of network build, optimisation, acceptance and operation

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KPI Examples – Rollout KPIs

Time (T0-T1) Percentage Covered Time (T0-T1) Percentage Covered25% 10% 25% 10%50% 30% 50% 40%75% 60% 75% 70%

100% 90% 100% 95%

Time (T0-T1) Percentage Installed Time (T0-T1) Percentage Installed25% 15% 25% 20%50% 40% 50% 45%75% 70% 75% 75%

100% 90% 100% 95%

Basic Level Coverage

Basic Level Coverage

Premium Level Coverage

Premium Level Coverage

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KPI Examples – Prediction KPIs

RSCP Thresholds for outdoor and indoor coverage according to guidelines

Treshold hierarchy

tool based calculation SLA relevant

Coverage KPI-PR-01 Outdoor-Coverage by signal level (RSCP) 100%

Coverage KPI-PR-02 Indoor-Coverage by signal level (RSCP) 90%

Capacity KPI-PR-03 Indoor-Effective service area 90%

Interference KPI-PR-04 Pilot Pollution<2%

Handover KPI-PR-05 Total SHO Area 30-35%Handover KPI-PR-06 Best Server 65-70%Handover KPI-PR-07 2 way SHO 25-30%Handover KPI-PR-08 3 way SHO 5-10%

PredictionKPIs

KPI No KPIs

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KPI Examples – E2E KPIs

Accessibility KPI565 Voice Service Non-Accessibility m/s <=1.5%

Retainability KPI567 Voice Cut-off Call Ratio m/s <=2.0%

Accessibility KPI566 Voice Service Access Time m/s <=6sec

Integrity KPI568 Voice Speech Quality on sample basis m/s >=3.5

Accessibility PI520c PDP_Context_Activation_Failure_Ratio m/s <=1.0%

Integrity KPI523 FTP User DL-Data Rate (Peak / Average / Cell Edge) m/s 350/200/100

Integrity KPI523 FTP User UL-Data Rate (Peak / Average / Cell Edge) m/s 350/150/100

Retainability KPI524 FTP Session Failure Ratio / HTTP Session Failure Ratio m/s <=2.0%

Integrity KPI525 FTP Session Time / HTTP Session Time m/s 5s

Integrity PI521b {service} PDP Context Activation Time (FTP+HTTP) m/s <=6sec

Accessibility PI520c PDP_Context_Activation_Failure_Ratio (FTP+HTTP) focus to s <=1.0%

Retainability KPI523 FTP User DL-Data Rate (Peak / Average / Cell Edge) focus to s 2800/1000/300

Retainability KPI523 FTP User UL-Data Rate (Peak / Average / Cell Edge) focus to s 1000/500/200

Retainability KPI524 FTP Session Failure Ratio / HTTP Session Failure Ratio focus to s <=2.0%

Integrity KPI525 FTP Session Time / HTTP Session Time focus to s 5s

Integrity PI521b {service} PDP Context Activation Time (FTP+HTTP) focus to s <=6sec

Integrity KPI511 Round Trip Time focus to s <100ms

Testing Method(Mobile/ Stationary)

Threshold (data rates in

kbps)

CS R

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HSPA

E2E KPIs Type KPI No KPIs

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E2E KPIs – Performance Peak, Average, Cell-Edge

Cell EDGE throughputCell edge shall be represented by the 5 percentile: the upper limit from the 5% lowest measured throughputs out of the entire set of individual measurement points. Average throuhputAverage throughput shall be the numerical average value out of the entire set of individualmeasurement points.Peak throughputPeak throughput shall be represented by the maximum value reached out of the set of individual measurement points (100 percentile)

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KPI Examples – Network Counter Statistics

Threshold hierarchy

cluster level SLA relevant

Availability KPI708 UMTS Radio Network Unavailability <=1.0% yes

Retainability KPI707 Outgoing CS IRAT HO failure rate <=1.5% yes

Retainability KPI706 Incoming CS IRAT HO failure rate <=1.5% yes

Retainability KPI709 Incoming PS IRAT cell changes failure rate <=1.5%

Retainability KPI710 Incoming PS IRAT cell reselection failure rate <=1.5%

Retainability KPI711 Outgoing PS IRAT cell changes failure rate <=1.5%

Availability RNC unavailability <=1% yes

Accessibility KPI565 Voice Service Non-Accessibility <=1.5% yes

Accessibility KPI701a UMTS RAB establishment failure voice<=0.5%

Retainability KPI567 Voice Cut-off Call Ratio <=2.0% yes

Accessibility KPI520c PDP_Context_Activation_Failure_Ratio <=1.0%

Accessibility KPI701c UMTS RAB establishment failure PS <=1.0%

Retainability KPI702c RAB abnormal Release Rate (PS) <=3,5% yes

Accessibility KPI520c PDP_Context_Activation_Failure_Ratio <=1.0%

Retainability KPI702c RAB abnormal Release Rate (PS) <=3,5% yes

Network Counters

TypeKPI No (QMIS) KPIs

UTR

AN

CS R

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Network Counter Assessment

KPI-565 Voice Service Non-Accessibility

Definition Probability that the end-customer can’t access the Mobile Telephony Service when requested

Method of calculation

KPI target values <=1,5%

Source of information Network Counters

Reporting monthly

Typical table for high level KPI definition Example

How does the method of KPI calculation look like ?

Since KPI definitions are strongly vendor dependent a detailed definition is required

(Detailed definition: abstract definition + equation, space aggregation, measurement point, reporting period, time aggregation, screening level, trigger points, signalling flow from / to network, …., vendor specific translation)

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Network Counter Assessment

Method of calculation within Vodafone

MAWD approach (Monthly Average Working Day)

- aggregate data within a reporting period in the same way

- refers to cell data in the networks

- applies to working days excluding the weekends, bank holidays or

other special events/days

- Types of MAWD operators

a) Arg Maximum: PH_MAWD (peak hour)

b) Maximum: PHV_MAWD (peak hour value)

c) Sum: S_MAWD (sum MAWD)

d) Mean Value M_MAWD (mean MAWD)

https://teamrooms1-vista.vodafone.com/eRoom/Global23/CompendiumKPIdefinitions/0_803e

Detailed description in

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Example - Street Level Design Threshold

DOWNLINK 12.2k CSMax Ptx node-B (dBm) 33,0Eb/No 6,0Noise density (dBm/Hz) -174,0UE Noise Factor (dB) 7,5Service Bit Rate (kbps) 12,2Noise floor -100,7

UE sensitivity (dBm) -119,6Total DL path loss (dB) 152,6Required Ec/Io -19,0

Feeder losses (dB) - 2,0TMA insertion loss + jumper loss (dB) - 1,0SHO Gain DL (dB) + 2,0Transmit diversity (dB) + 0,0Interference margin (dB) - 5,0UE Antenna Gain (dBi) + -2,0Node B Antenna Gain (dBi) + 18,0Body loss (dB) - 3,0LNF/Slow fading margin for 85% cell edge probability (dB) - 9,0PC Headroom / Fast fading (dB) - 2,5Indoor penetration loss (dB) - 0,0

Sum DL System Gains 10,5Area/service specific margins 15,0Total Gain/Margin -4,5

Street level Design Target DL path loss (dB) 148,1Threshold at street level (ave. DCH) -104,6

Eq. CPICH Threshold (average DL value on street level with CPICH power of 33 dBm) -100,1

Pilot33,0

-117,0150,0

2,01,00,00,05,00,0

18,03,09,00,00,0

15,017,0-2,0

148,0-100,0

-100,0

?

With chance of pilot powerthe threshold will change !

Sensitivity from 3GPP specificationTS 25.101, Table 7.2, Band I.

Overall Gain at the transmitter side

Radiated pilot power = Pilot + Gains

Threshold = Radiated Pilot Power – SL path-loss available

Example: 33 dBm+(18-2-1)dB–148,1dB = -100,1 dBm

?

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Wide Area Coverage urban sub-urban rural conditionsBaseline Threshold [dBm] -100 -100 -102 refercence is 146 dB path lossDefault Penetration Loss [dB] 23 18 12 OpCos specific to match 2GDefault Design Threshold [dBm] -77 -82 -90 OpCos specific for indoor coverage

reference is 146 dB path loss Wide Area Coverage urban sub-urban rural conditionsBaseline Threshold [dBm] -100 -100 -102 refercence is 146 dB path lossDefault Penetration Loss [dB] 23 18 12 OpCos specific to match 2GDefault Design Threshold [dBm] -77 -82 -90 OpCos specific for indoor coverage

reference is 146 dB path loss

How to come to a design threshold?

Reference baseline threshold

BTS

Penetration loss to overcome,depth of in-building coverage

• Base line threshold to ensure service

Designthreshold

Strategic decision

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Further Example - Utilisation Assessment

Method of calculation within Vodafone

Access network utilisation measures the physical resource usage …

DL Power

UL Noise

Codes

Channel Elements

75% load (design target) = 100% ‘utilisation’

3G Resource loading

Overall utilisation = MAX

resource

TRX

Capacity acc. ErlangB according to the design target = 100% ‘utilisation’

2G Resource loading

Overall utilisation = TRX

utilisation

… but in 3G it is not easy as it is in 2G!

1 r

es

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= 1

Dim

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4 r

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4 D

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ns

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s

In 3G the max of the resources are used to derive the final utilisation figure

Depending on the resource which is highly used different actions are required,

e.g.putting more base band capacity