Question: In E-UTRAN, how does a User Equipment (UE) in idle mode handle intra-frequency mobility when encountering Closed Subscriber Group (CSG) member cells during cell reselection?
Option 1: The UE always prioritizes CSG member cells for reselection, regardless of signal strength.
Option 2: The UE applies the 'best cell principle' considering all cells, including non-member CSG cells, based solely on signal strength.
Option 3: The UE uses the 'best cell principle' for cell ranking and reselection, ignoring known non-member CSG cells but considering all other cells.
Option 4: The UE randomly selects a cell from the list of available CSG member cells during reselection.
Explanation: This is correct because UEs utilize the 'best cell principle' for ranking and reselecting cells, ignoring known non-member CSG cells but considering all other cells, thus optimizing selection based on both eligibility and signal quality.