Question: Under what condition, related to RRC message size, will a UE capable of UL RRC message segmentation initiate the segmentation procedure in an RRC_CONNECTED state?
Option 1: When the encoded RRC message is smaller than the minimum supported size of a PDCP SDU.
Option 2: If the UE receives a specific RRC message indicating immediate release of resources.
Option 3: When the network congestion level exceeds a predefined threshold, triggering segmentation for efficient transmission.
Option 4: When the encoded RRC message is larger than the maximum supported size of a PDCP SDU.
Explanation: This correct answer reflects the condition directly related to the size of the RRC message in comparison to the PDCP SDU's maximum supported size, which is a crucial factor for initiating UL RRC message segmentation. This ensures efficient transmission by breaking down large messages into manageable segments, adhering to protocol specifications.