Question: Under what condition can a Node B initiate a DEDICATED MEASUREMENT FAILURE INDICATION message towards the CRNC in UTRAN?
Option 1: At any time after sending the RADIO LINK SETUP RESPONSE message, as long as the Node B Communication Context exists.
Option 2: Only during the initial setup of the Radio Link, before sending the RADIO LINK SETUP RESPONSE message.
Option 3: When the Dedicated Measurement Initiation procedure is explicitly cancelled by the CRNC.
Option 4: After receiving a dedicated measurement report from the UE.
Explanation: This is correct because, according to the specified procedure, after a Node B has sent a RADIO LINK SETUP RESPONSE message and as long as its communication context with the CRNC remains active, it has the flexibility to notify the CRNC of any failure in dedicated measurements at any subsequent point. This ensures timely reporting of measurement issues, facilitating efficient network management.