LTE Session Setup Success Rate

LTE Session Setup Success Rate – Checks

LTE session setup success rate is a combination of RRC setup success rate and initial EPS bearer setup success rate. It is recommended to analyze the reason o f degradation in RRC and ERAB phase separately to confirm which component is degraded.

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Rrccompl_missing in the RRC phase, mainly indicating a coverage issue. Please make sure that it is not due to a fault in MHA/TMA/Antenna/other build issues. Other failures in the ERAB phase includes RNL, transport , Resource and Other. It is recommended to include UL RSSI check as a regular exercise. In case UL RSSI have a strange behavior (Intermittent low values) or is constantly very low/high a possible HW/SW issues needs to be investigated. A rough estimation shows that value of UL RSSI is in the range of -110 if site is correctly build.

PCI/PRACH clash should be checked.

KPI’s to be analysed: 1. 2. 3. 4.

LTE_5218C(Conn Stp SR) LTE_5218C(Conn LTE_5060e(Initial LTE_5060e (Initial Access Accessibility) ibility) LTE_1(Avg RSSI PUCCH) LTE_5444b(Avg RSSI PUSCH) 5. LTE_5058b(Inter eNB HOSR ) 6. M8013C6(RRCCO M8013C6(RRCCOMPL_Miss MPL_Miss fails) 7. M8006C2(Fails RNL , E-RAB Accessibility) 8. M8007C2(Num M8007C2(Number ber of Data Radio Bearers failed to setup, RB Accessibility)

PCI/PRACH Clash to be checked: Please find the attached sample snap for possible PCI clash from optimizer:

If this is the case then needs to retune the frequency to have different physical cell id.

To disable dlRSboost Cell level parameter: Please find the attached sample snap to disable dlRSboost in order to reduce the cell coverage to enhance LTE SSSR