Ericsson KPI Formula
KPI |
Target |
FORMULAE - ERICSSON |
Random Access Success Rate % |
>=98 |
100 * CNROCNT / (CNROCNT + RAACCFA) |
SDCCH Blocking % |
<=0.5 |
100 * CCONGS / CCALLS |
SDCCH Drop % |
<=1.2 |
100 * (CNDROP - CNRELCONG) /
CMESTAB |
TCH Blocking % |
<=1 |
100 * (CNRELCONG + TFNRELCONG +
THNRELCONG) / TASSALL |
TCH Time Congestion/Cell |
<=50 sec |
Cells with Full Rate only: 100 *
TFTCONGS / (PERLEN*60) Cells with Half Rate: 100 * THTCONGS / (PERLEN*60) |
TCH Assignment Success Rate % |
>=97 |
100 * TCASSALL / TASSALL |
TCH Drop % |
<=2 |
100 * TNDROP / TCASSALL |
Handover Success Rate % |
>=95 |
100 * HOVERSUC / HOVERCNT |
Avg SDCCH Congestion/cell |
<=50 sec |
100 * CTCONGS / (PERLEN*60) |
Avg TCH Congestion/cell |
<=200 sec |
Cells with Full Rate only: 100 *
TFTCONGS / (PERLEN*60) Cells with Half Rate: 100 * THTCONGS / (PERLEN*60) |
Network Availability (Radio)% |
>=99.90 |
100 * (No of days * 24 * 60 * Total
No of Cells – Summation of Downtime in minutes of Cells) / (No of days *
24 * 60 * Total No of Cells) |
SDCCH Congestion <=30 sec |
>90 |
100 * CTCONGS / (PERLEN*60) |
% of cells having SQI samples
between 16-30 >90% |
>90 |
90% of cells having percentage of
Good samples>90% |
Peak Processor Load (MSCs/BSCs) % |
<=80 |
ACCLOAD/NSCAN (These counters are
available in object type LOAS) |
Switch BHCA Utilization (during
Switch NBH) |
<=80 |
100*( BHCA/SwitchBHCA Capacity) |
Paging Success Rate (24 hrs) % |
>=90 |
100 * (NLAPAG1RESUCC + NLAPAG2RESUCC)
/ NLAPAG1TOT |
Location Update Success Rate (24
hrs) % |
>=95 |
100 * NLALOCSUCC / NLALOCTOT |
Successful Call Rate (24 Hrs) % |
>=95 |
(NBANS + NABEFA1 + NABEFA2 +
NCAWNOA + NTOBEFA + NBOUT + NBBUSY) / NCALLS |
Network Availability (Switch/IN)% |
>99.99 |
100 * (No of days * 24 * 60 * Total
No of Nodes – Summation of Downtime in minutes of Nodes) / (No of days *
24 * 60 * Total No of Nodes) |
Core Network Availability % |
>99.99 |
100 * (No of days * 24 * 60 * Total
No of Nodes – Summation of Downtime in minutes of Nodes) / (No of days *
24 * 60 * Total No of Nodes) |
Attach Success Rate excluding
Unregistered Subs. % |
>=99 |
100 * [1 - ((gprsMmSgsnUnsuccAttReq
- gprsMmSgsnUnsuccAttReqCC7/8/14) / gprsMmSgsnAttReq)] |
PDP context activation success rate
(Only NW Cause codes) % |
>=99 |
100 * gprsSmSgsnSuccActivations /
(gprsSmSgsnSuccActivations + gprsSmSgsnUnsuccActivations) |
Round trip time |
<=700 ms |
Ping either a DNS server or an
external Internet server by the MS PING SIZE - 32BYTE |
Average UL throughput per TBF |
>=20 kbps |
ULBGEGTHR / ULBGEGDATA |
Average DL throughput per TBF |
>=45 kbps |
DLBGEGTHR / DLBGEGDATA |
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