Question: When priority information for UTRA TDD carrier frequencies is provided and `SrxlevServingCell > Sprioritysearch`, how often must a UE (User Equipment) search for higher priority UTRA inter-frequency cells?
Option 1: At least every `Thigher_priority_search`
Option 2: Every `(Ncarrier-1) * TmeasureTDD` for 3.84 Mcps and 7.68 Mcps options
Option 3: Only once after initial cell detection, with no recurring search requirement
Option 4: Continuously, without a specified interval, until higher priority cells are found
Explanation: According to the specifications for radio resource management in TDD (Time Division Duplex) mode, when the serving cell's signal level (`SrxlevServingCell`) exceeds the priority search threshold (`Sprioritysearch`), the UE is mandated to initiate a search for any higher priority UTRA inter-frequency cells at a minimum frequency defined by `Thigher_priority_search`. This ensures timely discovery and potential handover to superior quality or priority cells, enhancing network efficiency and user experience.