Question: In E-UTRAN, what happens to the associated logical channels when PDCP packet duplication is activated for a Radio Bearer (RB)?
Option 1: They can be sent on any serving cell without restriction.
Option 2: They are restricted to be sent only on certain serving cells to ensure duplicates are sent on different serving cells.
Option 3: One logical channel is always sent on the Primary Cell (PCell) while the other on a Secondary Cell (SCell).
Option 4: The logical channels are merged into a single transmission path.
Explanation: Activating PDCP packet duplication for an RB increases reliability by sending the same PDCP PDU on two independent paths. To ensure these duplicates are effectively sent over different routes, the network restricts the associated logical channels to certain serving cells, preventing them from being sent over the same cell. This strategic separation enhances the redundancy's effectiveness in reducing latency and improving reliability.