Question: In a UTRAN Iu-BC interface using SABP, when a logical error occurs in a request message of a Class 1 procedure that has no specific message to report the unsuccessful outcome, what action is taken?
Option 1: The procedure continues with a default value for the erroneous information.
Option 2: The procedure is terminated and the Error Indication procedure is initiated with an appropriate cause value, including Procedure Code IE and Triggering Message IE.
Option 3: The receiver sends a request for retransmission of the message.
Option 4: The logical error is ignored, and the procedure proceeds as if no error occurred.
Explanation: According to the specified behavior for Class 1 procedures in the context of logical errors without a specific reporting mechanism, terminating the procedure and initiating an Error Indication with detailed diagnostics (including Procedure Code IE and Triggering Message IE) is the prescribed course of action. This ensures that the error is properly identified and handled, maintaining the integrity of the communication process.