Question: In UTRAN Iur interface RNSAP signalling for 7.68Mcps TDD, which midamble allocation scheme(s) can be applied to both Downlink (DL) and Uplink (UL), based on the 3GPP specifications?
Option 1: Only Default Midamble
Option 2: Both Default Midamble and UE Specific Midamble
Option 3: Common Midamble and UE Specific Midamble
Option 4: None of the above, only Common Midamble is applicable to DL
Explanation: According to the specifications, Default midamble allocation depends on the associated channelisation code, applying to both DL and UL. Similarly, UE specific midamble is explicitly assigned and also applicable to both DL and UL. In contrast, Common midamble allocation is based on the number of channelisation codes but is only possible in DL. Therefore, both Default Midamble and UE Specific Midamble schemes can be applied to both Downlink (DL) and Uplink (UL).