4G – Intra Frequency HO Optimization (NSN) Vendor - Technology Nokia– LTE FDD Fact Findings / Background Adjust RSRP measurement filtering to avoid the risk of ping-pong handover, especially on fluctuate channel condition. No hysteresis applied which may increase the risk of frequent ping-pong HO. Objective (Pros) • Reduce/minimize the probability of Ping Pong Handover Mn + Ofn + Ocn - Hys > Ms + Ofs + Ocs + Off Parameter Mn Ofn Ocn Hys Possible Drawback (Cons) • Service Drop Rate and Handover Success Rate maybe impacted Ms Ofs Ocs Off a3Offset = 6 (3dB) - keep hysA3Offset from 0 (0dB) to 2 (1dB) filterCoefficientRSRP from 4 (fc4) to 6 (fc6) a3TimeToTrigger from 8 (320ms) to 6 (160ms) Parameter Changes (Nokia) • • • • Prerequisites / Execution Criteria • None KPI to Monitor • Standard KPIs • Additional: Too late and Too early HO counter Type of Activity • Strategic implementation Description Obtained from UE’s RSRP Measurement of neighboring intrafreq LTE cells Frequency specific offset of the frequency of the neighbor cell Cell specific offset of the neighbor cell Hysteresis parameter for this event. Actual value = IE value * 0.5 (dB) Obtained from UE’s RSRP Measurement of serving LTE cell Frequency specific offset of the serving frequency Cell specific offset of the serving cell Offset parameter for this event, i.e. a3-Offset. Actual value = IE value * 0.5 (dB) 4G – Intra Frequency HO Optimization (EID) Vendor - Technology Ericsson – LTE FDD Fact Findings / Background Adjust RSRP measurement filtering to avoid the risk of ping-pong handover, especially on fluctuate channel condition. No hysteresis applied which may increase the risk of frequent ping-pong HO. Mn + Ofn + Ocn - Hys > Ms + Ofs + Ocs + Off Parameter Mn Ofn Ocn Objective (Pros) • Reduce/minimize the probability of Ping Pong Handover Hys Ms Ofs Ocs Possible Drawback (Cons) • Service Drop Rate and Handover Success Rate maybe impacted Parameter Changes (Ericsson) • UeMeasControl.filterCoefficientEUtraRsrp from 4 to 6 • UeEutranMeasurement.a3Offset from 20 to 30 Prerequisites / Execution Criteria • None KPI to Monitor • Standard KPIs • Additional: Too late and Too early HO counter Off Description Obtained from UE’s RSRP Measurement of neighboring intrafreq LTE cells Frequency specific offset of the frequency of the neighbor cell Cell specific offset of the neighbor cell Hysteresis parameter for this event. Actual value = IE value * 0.5 (dB) Obtained from UE’s RSRP Measurement of serving LTE cell Frequency specific offset of the serving frequency Cell specific offset of the serving cell Offset parameter for this event, i.e. a3-Offset. Actual value = IE value * 0.5 (dB)
