Question: In UTRAN Iu interface RANAP signalling, when the Relocation Type information element indicates UE involvement in SRNS relocation, how is the relocation execution triggered for the UE?
Option 1: Via Iur interface, without notifying the UE directly
Option 2: By sending a radio interface handover command to the UE
Option 3: Through a core network update, followed by a paging message to the UE
Option 4: Automatically, upon completion of Iur-based relocation preparation
Explanation: According to RANAP signalling principles for SRNS relocation, if the Relocation Type indicates UE involvement, the network explicitly triggers the relocation by sending a radio interface handover command directly to the User Equipment (UE). This direct communication ensures the UE's seamless transition during the relocation process.