6/13/13 Technology Blog: High in call drop rate - - WCDMA (Nokia)

taktiktek.blogspot.com/2012/01/high-in-call-drop-rate-wcdma-nokia.html 1/3

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High in call drop rate - - WCDMA (Nokia)

1. Check high call drop cells and its neighbouring cells of any faulty alarms

2. Identify call drop root cause failure distribution and main failure contributor (radio, Iu, BTS, Iur, MS, RNC) – Services -> RSRAN079

3. Check SHO KPI if performance < 90% ( leads to radio failure)

Check if cells are at RNC border (check Iur capacity and SRNC relocation problem)

Detect badly performing neighbours using HO success rate per adjacency counters (M1013)

High incoming HO failure rate in all adjs – check sync alarms

Assessing neighbor list plan and visualization check with map

Evaluate HO control parameters and trigger threshold

4. Check ISHO KPI if RT ISHO < 90% or NRT < 80% (leads to radio failure)

Check missing neighbour (M1015), GSM frequency plan neighbour RNC and MSC database consistency audit, check alarm

of reference clock in 3G or in 2G, check 2G TCH congestion

Check RRC Drop ISHO RT / NRT

5. Detecting DL or UL path loss problem if RAB drop due to radio (dominant call

drop cause > 50%)

Check UL Lost Active KPI from Iub counters (active L1 synchronization failure) to check UL/DL path loss problem

Check ASU failure rate (UNSUC_ASU) which link to NO RESPONSE FROM RLC

Mapping radio failures with Tx power and CPICH related parameters -> CPICHToRefRABOffset, PTXDPCH MAX

Check Call reestablishment timer -> T315

Ecno distribution for bad coverage issue (M1007C38-M1007C47)

6. Check core network parameter setting if RAB_ACT_FAIL_XXX_IU

Check SCCP SGSN/RNC IuPS Tias/Tiar if RAB_ACT_FAIL_BACKG_IU

7. If high RAB_ACT_FAIL_XXX_BTS

Check if any BTS faulty alarm (7653 cell faulty alarm)

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High in call drop rate - -WCDMA (Nokia)

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6/13/13 Technology Blog: High in call drop rate - - WCDMA (Nokia)

taktiktek.blogspot.com/2012/01/high-in-call-drop-rate-wcdma-nokia.html 2/3

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If no alarms, COCO detach/attach

8. If high RAB_ACT_FAIL_XXX_MS

Check physical channel reconfiguration failure rate (IFHO, ISHO, code optimisation)

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