Question: In a UTRAN Iub interface (Node B Application Part - NBAP), for a single frequency cell, what happens if the `UpPCH Parameters IE` is included in the `COMMON TRANSPORT CHANNEL RECONFIGURATION REQUEST` message without the `UpPCH Position LCR IE`?
Option 1: Node B proceeds with the reconfiguration using default UpPCH positions.
Option 2: Node B sends a warning but continues with the procedure.
Option 3: The absence is ignored only if UARFCN IE is also absent.
Option 4: Node B rejects the procedure by sending a `COMMON TRANSPORT CHANNEL RECONFIGURATION FAILURE` message.
Explanation: If the `UpPCH Parameters IE` is included without the corresponding `UpPCH Position LCR IE`, Node B must reject the reconfiguration request to maintain network integrity and performance. The correct response is to notify the failure via a `COMMON TRANSPORT CHANNEL RECONFIGURATION FAILURE` message.