Question: In UTRAN's Iub Interface, what is a key consideration for implementing soft combining within Node B, particularly in FDD mode?
Option 1: Reducing signaling overhead between RNC and Node B
Option 2: Enhancing security for dedicated channel transmissions
Option 3: Improving QoS for non-real-time services only
Option 4: Minimizing transmission cost and optimizing efficiency close to the radio
Explanation: Soft combining, when executed close to the radio (i.e., within Node B), offers two primary benefits: reduced transmission cost (as less data needs to be sent back and forth for processing) and increased efficiency (by leveraging proximity to the radio interface for faster processing). This aligns with optimizing network performance and resource utilization in UTRAN architectures.