Question: For a UTRA FDD User Equipment (UE) supporting High Speed Downlink Packet Access (HSDPA), which of the following Release versions marks the mandatory starting point for applying the MIMO performance test on the High Speed Physical Downlink Shared Channel (HS-DSCH) in multi-path fading environments?
Option 1: Release 6, as it introduced basic HSDPA capabilities.
Option 2: Release 8, aligning with the introduction of LTE advancements.
Option 3: Release 9, although optional for UEs supporting MIMO features.
Option 4: Release 10, applying to all UTRA FDD UEs with HSDPA categories 27-28.
Explanation: According to the specifications, the MIMO performance test for HS-DSCH in multi-path fading environments is mandatory starting from Release 10 for all UTRA FDD UEs that support HSDPA UE capability categories 27-28. While Release 9 UEs with MIMO features can optionally undergo this test, Release 10 is the first release where this test becomes a requirement for the specified UE categories.