This parameter has importance when it is taking decision of measurement report triggering.
Let'me take A3 Event Measurement report triggering
This is the entering condition for A3 event to occur.
Mn + Ofn + Ocn − Hys > Mp + Ofp + Ocp + Off
Subscript p - Primary cell
Sunscript n - neighboring cell
M - Measurment result
Of - frequency specific offset of the frequency ()
Oc - cell specific offset
Hys - Current Hysteresis value
Off - Event Specific Offset parameter
(All expressed in dB)
When ENB sending measurement configuration to measure RSRP/RSRQ for specific frequency he provides the offset specific to each frequency (offsetFreq parameter sent inside MeasObjctE-UTRA ).So that he can measure by using this offset also.