ifies the freq./RAT. the currently serving frequency/RAT If the measured (S) value of X exceeds this This means that even if the S value is higher than Thresh, value and X is of higher priority than the currently Threshx, low and X is of higher priority than the serving cell, the UE shall reselect to X. current one, the UE does not necessarily reselect X specifies the freq./RAT. to X unless Threshx, low > Threshx, high Minimum periodicity for higher-priority T HigherPrioritySearch frequency layer measurements. T LowerPrioritySearch Minimum periodicity for lower-priority frequency layer measurements. T EqualPrioritySearch Minimum periodicity for equal-priority frequency layer measurements. List of RATs and associated priorities that the <RAT, Band, Priority> UEs may select (in the neighborhood of this cell), that is a sort of "neighbor RAT list". Figure 4.20 Broadcasted system information parameters to facilitate the priority- based scheme for interfrequency and inter-RAT cell reselection. The R criterion refers to the ranking criterion that is used to rank cells that fulfill their respec- tive S criteria. This ranking criterion is defined in TS 36.304 [15] and includes the RSRP measurement quantity and an offset value that can be specified between two cells, as shown in the table. have an impact on the UE discontinuous reception and transmission (DRX) performance, this parameter represents a trade-off between minimizing battery consumption and ensuring that the time it can take for the UE to detect the availability of its highest-priority RAT and frequency is short enough. When the measured S value in the currently serving cell is under Thresh serving,low starts interfrequency and inter-RAT measurements including RATs and frequen- cies of lower priority. However, the measurement frequency for lower-priority cells may be set lower than for high-priority cells by setting the T LowerPrioritySearch parameter. Similarly, a separate value for equal priority cells can be set in the Equal Priority Search parameter. The <