LTE KPI Calculator (Accessibility, Retainability, Mobility)
Turn OSS counters into the KPIs your report needs.
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LTE KPI Calculator (Accessibility, Retainability, Mobility) by TheCalcTools
How the LTE KPI Calculator (Accessibility, Retainability, Mobility) works
Enter the counters from your OSS for the period (hour or day).
Accessibility = RRC success × E-RAB success; retainability = abnormal releases ÷ total releases.
Handover success rate is successful executions ÷ attempts.
The formula
Worked example
Using the default values shown in the calculator:
| RRC connection attempts | 125000 |
|---|---|
| RRC connection successes | 124300 |
| E-RAB setup attempts | 118000 |
| E-RAB setup successes | 117500 |
| E-RAB abnormal releases (drops) | 420 |
| E-RAB total releases (normal + abnormal) | 117000 |
| Handover execution attempts | 31000 |
| Handover execution successes | 30650 |
- RRC SSR = 124,300 ÷ 125,000 = 99.44%; E-RAB SSR = 99.58%.
- CSSR = 99.02%; drop rate = 0.36%; HOSR = 98.87%.
Result:
| RRC setup success rate | 99.44% |
|---|---|
| E-RAB setup success rate | 99.58% |
| Call setup success rate (RRC × E-RAB) | 99.02% |
| E-RAB drop rate | 0.36% |
| Handover success rate | 98.87% |
Frequently asked questions
Do vendors use identical counters?
No. Counter names and definitions differ by vendor even where 3GPP TS 32.450 defines the KPI. Map your vendor’s counters to these inputs.
What are typical targets?
Operators commonly target above 99% for accessibility, below 1% drop rate and above 97–98% handover success, but each operator sets its own.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.