Question: During abortion of RRC connection establishment due to a NAS procedure being aborted, what action(s) shall the UE take if it has not yet entered RRC_CONNECTED?
Option 1: Continue running timer T300 and maintain current MAC configuration.
Option 2: Stop timer T300 (if running), reset MAC, release the MAC configuration, and re-establish RLC for all established RBs (except broadcast MRBs).
Option 3: Immediately enter RRC_IDLE state without modifying MAC or RLC configurations.
Option 4: Send a NotificationMessageSidelink to all connected UEs before taking any local actions.
Explanation: When the NAS procedure is aborted during RRC connection establishment, and the UE hasn't entered RRC_CONNECTED, it must halt the ongoing timer (T300), reset its Medium Access Control (MAC) layer, release the current MAC configuration, and re-establish the Radio Link Control (RLC) for all Radio Bearers (RBs) that were set up (excluding broadcast-related MRBs). This ensures a clean state before potentially retrying or moving to another operational mode.