Question: In FDD mode, if a RADIO LINK ACTIVATION COMMAND message includes a Delayed Activation Update IE indicating 'Activate' but excludes the First RLS Indicator IE, how should Node B respond?
Option 1: Initiate the Error Indication procedure.
Option 2: Ignore the omission and proceed with activation.
Option 3: Request additional information via a STATUS MESSAGE.
Option 4: Automatically include a default First RLS Indicator value.
Explanation: According to specified behavior for FDD mode, when Node B receives a RADIO LINK ACTIVATION COMMAND with a Delayed Activation Update IE set to 'Activate' without the accompanying First RLS Indicator IE, it identifies an abnormal condition. In response, Node B initiates the Error Indication procedure to signal and manage the detected error in the UTRAN Iub interface context, ensuring network integrity and prompting corrective action.