Question: In a Home Node B (HNB) Subsystem, what triggers the increment of an RRC Connection Establishment Failure measurement for a specific rejection cause during Failed RRC Connection Establishment?
Option 1: Receipt of an RRC Connection Request from a User Equipment (UE)
Option 2: Transmission of an RRC Connection Reject message by the HNB to the UE
Option 3: Successful establishment of an RRC connection for packet switched traffic
Option 4: Expiration of a timer set for RRC connection establishment on the HNB side without UE response, identified as 'NoReply'
Explanation: The correct answer is Option 2 because each RRC Connection Reject message transmitted by the HNB to the User Equipment (UE) increments the relevant per-cause measurement for Failed RRC Connection Establishment, directly relating to how failures are counted and categorized based on rejection causes communicated back to the UE.