Question: In a scenario where a UE is about to transmit a channel/signal using E-UTRA and another channel/signal using NR, with overlapping transmission times, how does the UE determine which channels/signals to prioritize if both radio access technologies have known priorities at least msec before the earliest transmission start?
Option 1: The UE prioritizes based on the SCI formats scheduling the transmissions, giving precedence to the technology with the higher scheduled priority.
Option 2: The decision is solely based on UE implementation specifics, without considering external scheduling or layer indications.
Option 3: The UE always prioritizes E-UTRA over NR for simultaneous transmissions to ensure backward compatibility.
Option 4: Prioritization is dynamically determined by the type of channel/signal being transmitted, with no fixed rule applicable across all scenarios.
Explanation: According to the principles guiding simultaneous transmission/reception in dual-radio access technology scenarios, when priorities are known in advance, the UE relies on the scheduling information (e.g., SCI formats) to determine which channels/signals to transmit, prioritizing the radio access technology with the higher scheduled priority. This ensures coordinated and efficient use of resources across different technologies.