Question: What is the primary purpose of the PDU Type 14 Frame Sequence Number Information Element (IE) in the context of UTRAN's Iu interface Radio Access Network Application Part (RANAP) signalling?
Option 1: To initiate a new RNSAP connection for User Equipment (UE: User Equipment) handovers.
Option 2: For authentication of UE during initial network attachment procedures.
Option 3: To manage Quality of Service (QoS) parameters for IuUP user data frames.
Option 4: To maintain continuity for numbering IuUP user data frames of PDU type 14 during RNSAP Relocation.
Explanation: The correct answer, Option 4, highlights the specific role of the PDU Type 14 Frame Sequence Number IE in ensuring seamless relocation (RNSAP Relocation) by maintaining the sequence of IuUP user data frames. This is crucial for preventing data loss or misordering during handovers between Radio Network Controllers (RNCs). The other options are incorrect because they describe unrelated procedures or functions within the UTRAN's signalling and user plane protocols.