quality (UE measurement report) Cell load (RNC measurement) Distance UL TX power (UE measurement report) DL TX power (BTS measurement) The UE can be ordered to do different measurements to support interfrequency/RAT measurement trig- gering: Event 1F. The best active set cell RSCP or Ec/No falls below the set threshold. Event 5A. The DL Dedicated Physical Channel (DPCH) quality falls below the set threshold. Parameter Planning Event 6A,6C. The UE transmission power is above the set threshold of the maximum transmitted power. The threshold for each triggering event can be configured by the event triggering threshold and time-to- trigger parameters. Measurement Control In a measurement control the RNC sends measurement parameters to the UE to command how measure- ments are done. The UE then performs measurements and reports according to measurement reporting criteria. The measurement control for the interfrequency and intrasystem handover triggering mecha- nism is similar. There are different parameters for each type of handover, but the measurement triggering and measurement control functionality works in a similar manner. The interfrequency and intrasystem measurements require the compressed mode. The measurements on an adjacent carrier are done during the transmission gaps. The possible control parameters include the reporting interval, the number of measurements the mobile is allowed to make and penalty timers after an unsuccessful interfrequency handover (IFHO) or intrasystem handover (ISHO) attempt. Handover Decision Criteria The RNC commands handover when the handover criteria are fulfilled, but there can be different decision procedures depending on the triggering criteria. For example, if the triggering condition Ec/10 of the serving cell is poor the target cell Ec/10 is ranked against the serving cell, but if the target cell is better the RNC commands IFHO to take place. In the case where the source cell RSCP falls below the triggering condition the handover decision algorithm compares the source and targ