Question: What action is taken by the MAC entity upon receiving a PUCCH Power Control Set Update for multiple TRP PUCCH repetition MAC CE on a Serving Cell in a 5G NR network?
Option 1: The MAC entity ignores the update if it's not for the primary PUCCH resource.
Option 2: The MAC entity automatically deactivates all other PUCCH power control sets for that Serving Cell.
Option 3: The MAC entity indicates to lower layers the information regarding the PUCCH power control set update for multiple TRP PUCCH repetition MAC CE.
Option 4: The MAC entity sends an acknowledgement to the network without updating the power control set.
Explanation: In a 5G NR network, when a MAC (Medium Access Control) entity receives a PUCCH (Physical Uplink Control Channel) Power Control Set Update for multiple TRP (Transmission Reception Point) PUCCH repetition on a Serving Cell, it is designed to inform the lower layers about this update. This ensures that all relevant components of the network are aware of and can apply the new power control settings for efficient communication, especially in scenarios involving multiple transmission points. Thus, indicating the update to lower layers is the correct procedural step following the reception of such a MAC CE (Control Element).