Start

Low HS payload? (standard < 30

Mbits/day)

YES

NO

Analyze on LQC Low HS Payload

Analyze CQI distribution

Steps : Check CQI distribution over same periodGet average CQI value (standard >22)Correlate trend of reported CQI with HS throughput to find relationInvestigate if low throughput was caused by low CQI...

Low throughput because of low

CQI ?

YES

NO

Investigate RF issue

Analyze HS & UL R99 RAB SR

Steps : Check HS and UL R99 RAB SRCheck reason of RAB blockingCorrelate trend of HS & UL R99 RAB SR with HS throughput to find relation ...

Any hardware or transmission instability?

YES

NO

Solve instability

Analyze capacity utilization

Steps : Check Iub utilization (standard < 75%)Check DL power utilization (standard < 75%)Check UL CE utilization (standard < 75%)Check DL CE utilization (standard < 75%)Check OVSF code utilization (standard < 75%)Check UL RTWP (standard < -96 dBm)...

Radio capacity need to be expanded ?

YES

NO

Request for expansion

Conduct cell trace for further

investigation

Steps : Check retransmission, scheduled throughput, served throughputCheck used CQI, reported CQICheck HSPA cell change frequencyCheck throughput interuption characteristic...

Analyze HS & UL R99 RAB SR

Steps : Check HS and UL R99 RAB SRCheck reason of RAB blockingCorrelate trend of HS & UL R99 RAB SR with HS throughput to find relation ...

Low throughput because of RAB

blocking ?

YES

NO

Tune parameter of Cell Admission

Control

Conduct cell trace for further

investigation

Steps : Check retransmission, scheduled throughput, served throughputCheck used CQI, reported CQICheck HSPA cell change frequencyCheck throughput interuption characteristic...

Finish

Root cause of low throughput

found ?

YES

Discuss solution

NO

Escalate to higher level (TS)

Analyze on LQC Low HS Payload

Steps : Check CQI distribution over same periodGet average CQI value (standard >22)Correlate trend of reported CQI with HS throughput to find relationInvestigate if low throughput was caused by low CQI...

Investigate RF issueSteps : Perform TP analysis to check if cell overshoots, poor coverage, bad indoor penetration,etcCheck if current target coverage is proper or notPerform drive/walk test (optional)Conduct site audit and take action if required...

Steps : Check HS and UL R99 RAB SRCheck reason of RAB blockingCorrelate trend of HS & UL R99 RAB SR with HS throughput to find relation ...

Solve instabilitySteps : Check detail alarm and escalate to related PICFollow up rectification progressMonitor HSDPA throughput after instability clear...

Check if CS traffic of same cell or colocated F1 also

low

Steps : Check Iub utilization (standard < 75%)Check DL power utilization (standard < 75%)Check UL CE utilization (standard < 75%)Check DL CE utilization (standard < 75%)Check OVSF code utilization (standard < 75%)Check UL RTWP (standard < -96 dBm)...

Request for expansion

Steps : Check retransmission, scheduled throughput, served throughputCheck used CQI, reported CQICheck HSPA cell change frequencyCheck throughput interuption characteristic...

Steps : Check HS and UL R99 RAB SRCheck reason of RAB blockingCorrelate trend of HS & UL R99 RAB SR with HS throughput to find relation ...

Tune parameter of Cell Admission

Control

Steps : Perform parameter audit on related CAC part (e.g FTI, power CAC, HW adm, DL code adm,etc)Adjust parameter setting to proper valueVerification of impact (check overall KPI also) ...

Steps : Check retransmission, scheduled throughput, served throughputCheck used CQI, reported CQICheck HSPA cell change frequencyCheck throughput interuption characteristic...

Discuss solution Steps : Check if it is due to user bahaviourCheck if any solution out of radio part can be proposedDiscuss with other departments and customer...