Question: What is the primary purpose of the Iub interface in relation to Uplink Shared Channel (USCH) data in a UTRAN network?
Option 1: To manage signaling between Node B and multiple RNCs for load balancing.
Option 2: To transport dedicated channel data exclusively for a single User Equipment (UE).
Option 3: To facilitate the transport of USCH data frames between Node B and Radio Network Controller (RNC) for one or more UEs.
Option 4: To handle downlink shared channel data transmission from RNC to Node B.
Explanation: The correct answer, Option 3, accurately reflects the role of the Iub interface as described. It highlights the interface's function in transporting USCH data frames between Node B and the RNC, acknowledging that this can be for one or more UEs, since a UE may have multiple USCH data streams. This demonstrates an understanding of how shared channel data is managed within the UTRAN architecture, focusing on the practical application of Iub interface principles in telecom networks.