Question: Under what condition(s) does a transmitting PDCP entity activate PDCP duplication for a Data Radio Bearer (DRB)?
Option 1: Only when explicitly indicated for the specific DRB.
Option 2: When indicated for at least one associated RLC (Radio Link Control) entity, but not necessarily for the DRB itself.
Option 3: Both when explicitly indicated for the DRB and when indicated for at least one associated RLC entity.
Option 4: Under none of the above conditions; PDCP duplication for a DRB is activated based on Signal Radio Bearer (SRB) configurations.
Explanation: A transmitting PDCP entity activates PDCP duplication for a DRB under two conditions: (1) when explicitly indicated for the DRB itself, and (2) when indicated for at least one associated RLC entity, leading to activation for the DRB. This ensures flexibility and robustness in managing data transmission across different bearers and link control entities within a 5G NR network.