Question: Upon receiving an Upper Layer Abort in a Point-to-Point Short Message Service (SMS) scenario, what action(s) does the SMC entity in both the Network and Mobile Station (MS) take, irrespective of whether a CP-ERROR message is sent?
Option 1: Pass an error indication to SM-RL, send a CP-ERROR message, and release the MM connection with a specified release cause before entering the Idle state.
Option 2: Form and send a CP-ERROR message, pass an MM-connection release request without indication of release cause to the MM-sublayer, and then enter the Idle state.
Option 3: Immediately release the MM connection with a specified release cause and enter the Idle state without sending a CP-ERROR message or passing an error indication to SM-RL.
Option 4: Reset timer TC1* and wait for further instructions from the SM-RL before taking any action.
Explanation: When the SMC entity in both the Network and Mobile Station receives an Upper Layer Abort, it shall form and send a CP-ERROR message (if applicable), pass an MM-connection release request without specifying a release cause to the MM-sublayer, and then transition into the Idle state, ensuring a graceful termination of the transaction due to errors at the SM-RL layer.