Question: How does a User Equipment (UE) handle an RRC message with a non-comprehended field value that has no default value, is not optional, when received on any logical channel in an E-UTRA network?
Option 1: The UE discards the entire RRC message and requests retransmission.
Option 2: The UE applies a standard error correction mechanism to deduce the field's intended value.
Option 3: The UE treats the message as if the field were absent and follows procedures for handling absence of critical fields.
Option 4: The UE uses the last known valid value for the field from a previous RRC message.
Explanation: According to E-UTRA RRC protocol specifications, when a UE encounters an RRC message with a non-comprehended field value lacking a default value and not marked as optional, it processes the message as if the problematic field were absent, adhering to predefined handling procedures for missing critical fields, thus maintaining network stability and functionality.