Question: In UTRAN Iub interface Node B Application Part (NBAP) signalling, what is a key characteristic of the Transport Format Set associated with a specific Transport Channel, such as a Dedicated Channel (DCH)?
Option 1: The Transport Format Set can vary for different transport channels within the same CCTrCH in both FDD and TDD modes.
Option 2: The Transport Format Set is defined uniquely for each UE's session, regardless of the Transport Channel used.
Option 3: The Transport Format Set for each transport channel within the same CCTrCH must have different values for the 1st Interleaving Mode IE in TDD mode.
Option 4: The Transport Format Set for each transport channel within the same CCTrCH shall have the same value for the 2nd Interleaving Mode IE, specifically in TDD mode.
Explanation: This question assesses understanding of NBAP signalling specifics. Option 4 is correct because, in TDD mode, there's a specific requirement for Transport Format Sets of transport channels within the same CCTrCH to have the same value for the 2nd Interleaving Mode IE, highlighting an important nuance in configuring transport channels in TDD mode, impacting how data is interleaved and transmitted efficiently across the network.