name: DER
full_form: Derived Earliest Representation
context: This measurement provides the average quality of the neigbor cell that triggered HO (target HO cell) reported in the UE measurement reports. The average is computed over all measurement reports that triggered HO during the measurement granularity period. Separate measurement is produced for each measurement quantity {RSRP, RSRQ}. DER (n=1) For each UtranRelation, this measurement is obtained by accumulating the value (linear value converted from dbm unit) of the quality of neighbor (target) cell (RSRP, RSRQ) in the UE measurement report causing HO to the subject neighbor (target) cell on the UtranRelation, and dividing the accumulated value by the number of HO occurrence on the UtranRelation at the end of granularity period, and converting the value back to dbm unit from linear value. Separate measurement is provided for RSRP and for RSRQ. Each measurement is a single integer value in dBm (RSRP) or dB (RSRQ) HO.TrgtCellQual.RSRP HO.TrgtCellQual.RSRQ EUtranRelation Valid for packet switched traffic EPS
description: The Derived Earliest Representation (DER) is a performance measurement in the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) that calculates the average quality of the neighboring cell when Handover (HO) is triggered. It provides separate measurements for Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ), computed over all measurement reports that triggered HO during a specified granularity period.
explanation: DER is classified as a Measurement because it involves the calculation of specific values (RSRP and RSRQ) to assess the quality of neighboring cells triggering Handover, aligning with the performance management specifications in 3GPP TS 32.425 for E-UTRAN.
section_title: 4.3.1.7.2 Average quality of the neighboring cell when HO is triggered
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