Question: In UTRAN Iu interface, what is a key characteristic of the Connection Oriented Data Transfer Service provided for RANAP signalling?
Option 1: Guaranteed delivery of RANAP messages out of sequence
Option 2: In-sequence delivery of RANAP messages with dynamic connection establishment
Option 3: Best-effort delivery of RANAP messages without notification of connection breaks
Option 4: Scheduled delivery of RANAP messages based on UE priority
Explanation: The correct answer, Option 2, highlights two crucial aspects of the Connection Oriented Data Transfer Service for RANAP: (1) In-sequence delivery of RANAP messages, ensuring that messages are received in the order they were sent, which is vital for maintaining the integrity of signalling processes; and (2) dynamic connection establishment, allowing for signalling connections to be set up and torn down as needed, which supports efficient resource utilization and adaptability in the network. This aligns with the requirements for reliable and flexible signalling transport in UTRAN environments.