Question: In UTRAN, when Multicell E-DCH Transport Bearer Mode is set to "UL Flow Multiplexing Mode", how are Mac-d flows from different carriers handled in the DRNS?
Option 1: Each carrier's Mac-d flow is transmitted over a shared Iur transport bearer but with prioritization.
Option 2: Mac-d flows are demultiplexed and sent over separate Iur transport bearers for each carrier.
Option 3: The mode reverts to "Separate Iur Transport Bearer Mode" for compatibility reasons.
Option 4: Mac-d flows from different carriers are multiplexed onto a single Iur transport bearer (per Mac-d flow).
Explanation: In the context of UTRAN's Multicell E-DCH Transport Bearer Mode, specifically when set to "UL Flow Multiplexing Mode", the design dictates that multiple Mac-d flows (each from a different carrier) are efficiently managed by being multiplexed onto one Iur transport bearer. This approach optimizes resource utilization while maintaining the integrity of each flow, as each is still uniquely identified and handled within the shared bearer (per Mac-d flow). This highlights an important aspect of telecom network design: balancing efficiency with the need for clear signal differentiation and management.