Question: In UTRAN Iub interface Node B Application Part (NBAP) signalling for 7.68Mcps TDD, which midamble allocation scheme(s) can be applied to both Downlink (DL) and Uplink (UL) for burst types 1, 2, and 3?
Option 1: Default Midamble only
Option 2: Common Midamble only
Option 3: UE Specific Midamble only
Option 4: Both Default Midamble and UE Specific Midamble
Explanation: For burst types 1, 2, and 3 in a 7.68Mcps TDD setup, 'Default midamble' is allocated based on the channelisation code (applicable to both DL and UL) and 'UE specific midamble' allows explicit assignment for a UE (also applicable to both DL and UL), making Option 4 correct as it identifies schemes applicable to both DL and UL.