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G Accessibility Root Cause Analysis Ericsson RCA UMTSDescription complète
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How to Improve Accessibility UMTS Nokia Summarized by Local Optim
Accessibility Success Rate Definition •
KPI DEFINITION : (Number of Call Established Number of Call Fails) / Number of Call Attempts –
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
Action 1. Investigation Investigation High HSDPA Setup Fail UL DCH Fails 2. Troubleshooting 1. Parameter adjustment for PrxTarget, PrxMaxTargetBTS, PrxTargetPSMax, PrxTargetPSMax, PrxT Prx TargetPSMin, PrxNoise Prx Noise and PrxloadMarginDCH
2. BTS Hardware and Software troubleshooting
Performance After Execution (HSDPA Acc.) AC fails Parameter Adjustment
CRF Executed
CRF Executed
Performance After Execution (AMR CSSR) AC fails Parameter Adjustment
Performance After Execution (BTS SW and HW) high UL Noise Floor CR Executed
Setup Failures caused by BTS Fails
Case: Accessibility due to BTS Issue: Low Accessibility Accessibility HSDPA HSDPA
SR and R99 in some wcel due to BTS fails
Action 1. Investigation Investigation High Setup Fail due to BTS Fails 2. Troubleshooting 1. Need CE Hardware Troubleshooting Troubleshooting 2. Need Site Troubleshooting Troubleshooting (re-commisioning and/or reset) 3. Need alarm clearance
Performance After Execution (BTS fails due to CE) CRF Executed
CRF Executed
Performance After Execution (BTS fails due to Alarm) CRF Executed
Performance After Execution (BTS Troubleshooting) Site Re-commisioning and/or reset CRF Executed
Setup Failures caused by Max User Fails
Case: Accessibility due to Max Users Issue: Low Accessibility HSDP HSDPA and R99 SR in some wcel due to Max User fails
Action 1. Investigation Investigation High HSDPA Setup Fail due to Max Users Fails 2. Troubleshooting 1. Need Site Troubleshooting Troubleshooting (re-commisioning and/or reset) 2. Need alarm clearance
Performance After Execution (Max Users) with recommisioning
CRF Executed
Performance After Execution (Max Users) with alarm clearance
CRF Executed
Setup Failures caused by RNC Fails
Case: Accessibility due to RNC fails Issue: Low Accessibility HSDP HSDPA and R99 SR in some wcel due to RNC fails
Action 1. Investigation Investigation High HSDPA Setup Fail due to RNC Fails 2. Troubleshooting 1. Need alarm clearance (RNC internal and wbts transmission) 2. Need Site Troubleshooting Troubleshooting (re-commisioning and/or reset)
Performance After Execution (RNC fails) with Alarm clearance CRF Executed
Performance After Execution (BTS Troubleshooting) Site Re-commisioning and/or reset CRF Executed
Performance Perform ance After Execution (RNC internal) with Alarm clearance
CRF Executed
Setup Failures caused by Transmission Fails
Case: Accessibility due to Transmission fails Issue: Low Accessibility HSDPA HSDPA and R99 SR in some wcel due to Transmission fails
Action 1. Investigation 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
Performance After Execution (IuB fails) with Alarm clearance CRF Executed
Performance After Execution (IuB fails) CRF Executed
CRF Executed
Performance After Execution (IuB fails due to Alarm) CRF Executed
Setup Failures caused by UE Fails
Case: Accessibility due to UE fails Issue: Low Accessibility Voice Voice AMR SR in some wcel due to UE fails
Action 1. Investigation 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)
