Guideline For Dummies
4G CDR PS Fast Analyze 2017 – 2017 –
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4G PS Drop Rate
Condition
Abnormal release caused by non-vendor equipment should be excluded.
KPI Formula
- (E-RAB Drop Call Rate (%))
∑ / ∑( + ) * 100% Service drop rate indicate the network capability to retain services requested by end users for a desired duration once the user is connected to the service. The above counters only take into account the ERAB Abnormal Release initiated by eNodeB excluding the ERAB Abnormal Release initiated by MME. The ERAB Abnormal Release on the EPC side i s measured by another set of counters, .
Counter Description
measures the total number of ERABs release initiated by the eNodeB or MME. measures the total number of activated eRABs abnormal release initiated by the eNodeB in a cell.
4G PS Drop Rate
- (E-RAB Drop Call Rate (%))
Optimization Suggestion
Performance Counter
Analysis to classify the causes
Identify the major causes for ERAB abnormal releases.
In eRAN7.0, many new performance counters have been introduced, and the sub-failure causes can be further categorized to ERAB VoIP service or not.
4G PS Drop Rate - (E-RAB Drop Call Rate (%))
Optimization Suggestion
Performance Counters
Identification Methodology
Possible Causes
≥ -115dBm
UL interference
≥ 80% or ≥ 80% or ≥ 200
Cells are heavily loaded, and networks are congested
Others
1. Weak coverage 2. Missing configurations of neighboring cells
Check the Intra-/Inter-Frequency Handover Success Rate
1. Abnormal handovers 2. Incorrect defined neighbor relationships
None
1. SCTP faults 2. GTPU faults 3. Transmission faults
None
Cells are heavily loaded, and networks are congested
End Of The Slide
