Question: How does a UE (User Equipment) handle uplink resource sharing among multiple radio bearers with the same priority when the prioritised bit rate (PBR) is set to zero for all bearers?
Option 1: The UE allocates resources based on the bearer's throughput history.
Option 2: The UE serves these radio bearers in a round-robin scheduling manner.
Option 3: The UE maximises transmission of one bearer before moving to the next, based on first-come-first-served principle.
Option 4: The UE serves these radio bearers equally, allocating resources to maintain fairness among them.
Explanation: Since multiple bearers have the same priority and all PBRs are set to zero, the UE applies the principle of equal service to ensure fairness among them, serving these radio bearers equally.