Question: Upon expiry or stop of timer T305, and assuming timer T302 is not running, what action does the UE take regarding mobile originating signalling when connected to EPC (Evolved Packet Core)?
Option 1: Ignore the event and maintain current signalling restrictions
Option 2: Inform lower layers about enforcing stricter mobile originating signalling rules
Option 3: Request manual override from the user for mobile originating signalling
Option 4: Inform upper layers about barring alleviation for mobile originating signalling
Explanation: According to the specified behavior for timer T305 expiry or stop, and with the condition that timer T302 is not running, the UE is required to notify its upper layers that restrictions (barring) on mobile originating signalling are alleviated. This action implies a relaxation of previous limitations, allowing for more flexible handling of mobile-originated signals. This behavior is crucial for managing network access and resource allocation efficiently in response to changing conditions or user needs.