Question: For a 4Rx capable UE supporting FDD CA/DC, TDD CA/DC and TDD-FDD CA/DC configurations, how should the Rx be connected if any of the PCell and/or the SCells/PSCell is a 2Rx supported RF band?
Option 1: All 4Rx should be connected with data source from system simulator.
Option 2: Only 1Rx should be connected with data source from system simulator, and the other 3Rx are connected with zero input.
Option 3: 2 out of the 4Rx should be connected with data source from system simulator, and the other 2Rx are connected with zero input.
Option 4: The connection of Rx depends on UE’s declaration and AP configuration.
Explanation: According to the text, if any of the PCell and/or the SCells/PSCell is a 2Rx supported RF band, 2 out of the 4Rx should be connected with data source from system simulator, and the other 2Rx are connected with zero input. This ensures that the UE can still perform the required tests even if not all Rx are connected to the data source.