Terms in Key Performance Indicators or KPI

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
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4. HOSR (HAND OVER SUCCESS RATE)
Definition: Successful internal and external outgoing handovers of total number of internal and external outgoing handover attempts

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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