Question: What is the primary purpose of the Radio Access Bearer (RAB) Assignment procedure in the UTRAN Iu interface?
Option 1: To establish new RABs, modify existing ones, and release established RABs for a given User Equipment (UE), utilizing connection-oriented signalling.
Option 2: To manage only the release of established RABs for a UE, using connectionless signalling.
Option 3: Solely to establish new RABs for a UE without modifying or releasing existing ones, through connection-oriented signalling.
Option 4: To handle RAB modifications and releases but not the establishment of new RABs for a given UE, via connection-oriented signalling.
Explanation: The correct answer is Option 1 because it accurately reflects the comprehensive purpose of the RAB Assignment procedure. This includes establishing new Radio Access Bearers (RABs), enabling modifications to existing RABs, and facilitating the release of already established RABs for a specific User Equipment (UE), all via connection-oriented signalling.