Question: When a User Equipment (UE) generates an interspersed ROHC (Robust Header Compression) feedback packet for transmission in an E-UTRA network, how is the corresponding PDCP (Packet Data Convergence Protocol) Control PDU handled?
Option 1: The UE associates a PDCP Sequence Number (SN) and performs ciphering before submitting it to lower layers.
Option 2: The UE submits the PDCP Control PDU to lower layers without associating a PDCP SN, nor performing ciphering.
Option 3: The UE discards the ROHC feedback packet if no PDCP SN is available for association.
Option 4: The UE delays transmission until ciphering can be performed on the PDCP Control PDU.
Explanation: This correct handling ensures that interspersed ROHC feedback packets, crucial for efficient header compression and decompression in wireless communications, are promptly transmitted without unnecessary overhead (like sequence numbering or encryption) that could delay their delivery. This approach aligns with optimizing real-time communication efficiency in E-UTRA networks.