Question: What is a key characteristic of the signaling used in the Relocation Resource Allocation procedure for allocating resources from a target Radio Network Subsystem (RNS) during a Serving Radio Network Subsystem (SRNS) relocation?
Option 1: Connectionless signalling, to reduce overhead
Option 2: Dedicated Channel (DCH) only, for high-priority UEs
Option 3: Non-Access Stratum (NAS) signalling, for direct UE involvement
Option 4: Connection-oriented signalling, ensuring coordinated resource allocation across all Iu connections for a User Equipment (UE)
Explanation: The correct answer is Option 4 because the Relocation Resource Allocation procedure relies on connection-oriented signalling. This approach ensures that resource allocation is reliably and sequentially managed across all existing Iu signalling connections for a UE, guaranteeing coordinated relocation of SRNS resources. Connection-oriented signalling is particularly suited for such critical procedures, as it establishes a dedicated, reliable connection before data transfer, minimizing the risk of errors or misallocations during the relocation process.