KPI Introduction

1. CSSR (CALL SETUP SUCCESS RATE)

Definition: Rate of calls going until TCH successful assignment



2. SCR (SUCCESSFULL CALL RATE)

Definition: Rate of calls going until normal release that is not interrupted by SDCCH DROP, neither by assignment failures, and neither by CALL DROP.



3. CALL DROP RATE (CDR)

Definition: Rate of all losses of TCH connections during a call in relation to the number of successful Call Setups





4. HOSR (HAND OVER SUCCESS RATE)

Definition: Successful internal and external outgoing handovers of total number of internal and external outgoing handover attempts



5. PSR (PAGING SUCCESS RATE)

Definition: Rate of successful paging attempts of total number of paging attempts.The formula is based on NSS point of view (based on MSC or LAC)



6. LOCATION UPDATE SUCCESS RATE

Definition: Successful location update

attempts of total number of location update attempts. The formula is based on NSS point of view.



7. SDCCH BLOCK RATE

Definition: SDCCH congestion of total number of SDCCH seizure attempts



8. SDCCH DROP RATE

Definition: Dropped SDCCH connections of total number of SDCCH connections without TCH congestion.



9. TCH ASSIGNMENT BLOCK RATE

Definition: Rate of TCH unsuccessful seizures during assignment procedure due to congestion



10. TCH Assignment Failure Rate (exclude blocking)

Definition: Rate of RTCH seizure failed (system + radio) during normal assignment procedure over the total amount of RTCH request for normal assignment procedure



11. EMD (Erlang Minute per Drop)

Definition: Total of Erlang minutes (TCH occupation) in one period measurement per drop call (after TCH Assignment).



12. TCH Availability

Definition: Available TCH of total number of defined TCH



13. RACH Success Rate

Definition : Rate of Successful RACH over the total number of channel required message received