Question: What is a prerequisite for the Radio Link Setup procedure in the UTRAN Iur interface, as per RNSAP signalling?
Option 1: Establishment of a connectionless service on the signalling bearer
Option 2: Establishment of a connection-oriented service on the signalling bearer
Option 3: Activation of all available radio links in the DRNS
Option 4: Deactivation of existing radio resources in the DRNS
Explanation: The correct answer is Option 2 because, according to RNSAP signalling specifications for Radio Link Setup, establishing a connection-oriented service on the signalling bearer is mandatory concurrently with this procedure. This ensures reliable and sequential delivery of signals, crucial for efficiently setting up radio links in the UTRAN architecture. Connection-oriented services guarantee data delivery in the correct order, vital for successfully setting up radio resources.