Summarized by Local Optim

Network and Service Quality Management Confidential 1

How to Improve Accessibility UMTS Nokia

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Accessibility Success Rate Definition

• KPI DEFINITION :

(Number of Call Established– Number of

Call Fails) / Number of Call Attempts

• FORMULA:

CSSR CS Voice (%) =

100*Sum(MOC_CONV_CALL_ATTS-

MOC_CONV_CALL_FAILS+MTC_CONV_CALL_ATTS-

MTC_CONV_CALL_FAILS+EMERGENCY_CALL_ATTS-

EMERGENCY_CALL_FAILS)/Sum(MOC_CONV_CALL_ATTS

+MTC_CONV_CALL_ATTS+EMERGENCY_CALL_ATTS-

RRC_ATT_REP_MO_CONV-RRC_ATT_REP_MT_CONV-

RRC_ATT_REP_EMERGENCY)*Sum(RAB_ACC_COMP_CS_

VOICE)/Sum(RAB_STP_ATT_CS_VOICE)

HSDPA Accessibility Success Rate (%) =

100*Sum(ALLO_HS_DSCH_FLOW_INT+ALLO_HS_DSCH_FL

OW_BGR)/Sum(ALLO_HS_DSCH_FLOW_INT+ALLO_HS_DS

CH_FLOW_BGR+REJ_HS_DSCH_RET_INT+REJ_HS_DSCH

_RET_BGR+SETUP_FAIL_RNC_HS_DSCH_INT+SETUP_FAI

L_BTS_HS_DSCH_INT+SETUP_FAIL_IUB_HS_TOTAL_INT+

SETUP_FAIL_RNC_HS_DSCH_BGR+SETUP_FAIL_BTS_HS

_DSCH_BGR+SETUP_FAIL_IUB_HS_TOTAL_BGR)

• MESSAGE FLOW

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Accessibility Cause Failure

* Experienced during project

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Setup Failures caused by AC and/or UL DCH

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Case: Accessibility due AC / UL DCH

Issue: Low HSDPA Accessibility SR in some wcel due to UL DCH fails

Issue: Low AMR CSSR in some wcel due to AC fails

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Action

1. Investigation High HSDPA Setup Fail UL DCH Fails

2. Troubleshooting 1. Parameter adjustment for PrxTarget, PrxMaxTargetBTS,

PrxTargetPSMax, PrxTargetPSMin, PrxNoise and PrxloadMarginDCH

2. BTS Hardware and Software troubleshooting

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Performance After Execution (HSDPA Acc.) AC fails Parameter Adjustment

CRF Executed CRF Executed

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Performance After Execution (AMR CSSR) AC fails Parameter Adjustment

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Performance After Execution (BTS SW and HW) high UL Noise Floor

CR Executed

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Setup Failures caused by BTS Fails

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Case: Accessibility due to BTS

Issue: Low Accessibility HSDPA SR and R99 in some wcel due to BTS fails

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Action

1. Investigation High Setup Fail due to BTS Fails

2. Troubleshooting 1. Need CE Hardware Troubleshooting

2. Need Site Troubleshooting (re-commisioning and/or reset) 3. Need alarm clearance

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Performance After Execution (BTS fails due to CE) CRF Executed

CRF Executed

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Performance After Execution (BTS fails due to Alarm)

CRF Executed

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Performance After Execution (BTS Troubleshooting) Site Re-commisioning and/or reset

CRF Executed

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Setup Failures caused by Max User Fails

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Case: Accessibility due to Max Users

Issue: Low Accessibility HSDPA and R99 SR in some wcel due to Max User fails

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Action

1. Investigation High HSDPA Setup Fail due to Max Users Fails

2. Troubleshooting 1. Need Site Troubleshooting (re-commisioning and/or reset)

2. Need alarm clearance

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Performance After Execution (Max Users) with recommisioning

CRF Executed

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Performance After Execution (Max Users) with alarm clearance

CRF Executed

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Setup Failures caused by RNC Fails

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Case: Accessibility due to RNC fails

Issue: Low Accessibility HSDPA and R99 SR in some wcel due to RNC fails

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Action

1. Investigation High HSDPA Setup Fail due to RNC Fails

2. Troubleshooting 1. Need alarm clearance (RNC internal and wbts transmission)

2. Need Site Troubleshooting (re-commisioning and/or reset)

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Performance After Execution (RNC fails) with Alarm clearance

CRF Executed

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Performance After Execution (BTS Troubleshooting) Site Re-commisioning and/or reset

CRF Executed

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Performance After Execution (RNC internal) with Alarm clearance

CRF Executed

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Setup Failures caused by Transmission Fails

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Case: Accessibility due to Transmission fails

Issue: Low Accessibility HSDPA and R99 SR in some wcel due to Transmission fails

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Action

1. Investigation High Setup Fail due to IuB Fails

2. Troubleshooting 1. Need alarm clearance (wbts transmission)

2. Upgrade IuB capacity 3. CoCo Reconfiguration or feature implementation

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Performance After Execution (IuB fails) with Alarm clearance

CRF Executed

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Performance After Execution (IuB fails)

CRF Executed

CRF Executed

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Performance After Execution (IuB fails due to Alarm)

CRF Executed

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Setup Failures caused by UE Fails

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Case: Accessibility due to UE fails

Issue: Low Accessibility Voice AMR SR in some wcel due to UE fails

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Action

1. Investigation High AMR voice Setup Fail due to UE Fails

2. Troubleshooting 1. Need alarm clearance

2. ADJx tuning 3. Other failures correlation (BTS, AC and IuB)

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Performance After Execution (UE fails)

CRF Executed

CRF Executed

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Thank You