Question: In a 5G NR network, according to MAC protocol specifications, what is a key consideration for multiplexing PDU(s) associated with one Scheduling Configuration Indicator (SCI) on logical channels for unicast, groupcast, or broadcast transmissions?
Option 1: The SCI's priority level and the UE's power headroom.
Option 2: Only the Source Layer-2 ID, regardless of the Destination Layer-2 ID.
Option 3: Both the Source Layer-2 ID and the Destination Layer-2 ID must match.
Option 4: The type of service (e.g., voice, data, video) being transmitted.
Explanation: For efficient and correct routing of PDUs in sidelink communications (unicast, groupcast, broadcast), the MAC protocol requires that both the Source Layer-2 ID and the Destination Layer-2 ID pair must be identical for logical channels associated with one SCI. This ensures that transmissions are properly directed and received by the intended parties within the network, highlighting the importance of matching L2 IDs in sidelink communication setups.