Question: In E-UTRAN, how does the network inform a User Equipment (UE) about the necessity of pre-registering with an HRPD (High Rate Packet Data) system in advance of cell re-selection or handover?
Option 1: Through a dedicated SMS message to the UE.
Option 2: Over broadcast channel and in a dedicated Radio Resource Control (RRC) message.
Option 3: Via a push notification from the network's application server.
Option 4: By modifying the UE's APN settings to prompt pre-registration.
Explanation: This is correct because, according to E-UTRAN protocols for handling pre-registration with HRPD systems, the network utilizes both broadcast channels (for general announcements) and dedicated RRC messages (for specific UE instructions) to communicate the need for pre-registration. This approach ensures that UEs are efficiently informed without unnecessary overhead, maintaining seamless connectivity during handovers or cell re-selections.