Question: What action does the User Equipment (UE) take when it receives a Downlink (DL) user data packet with a QoS Flow Identifier (QFI) and a Reflective QoS Indicator (RQI), but cannot derive an uplink packet filter from the DL packet?
Option 1: The UE ignores the RQI and handles the received DL user data packet.
Option 2: The UE sends a request to the network for retransmission of the DL packet without the RQI.
Option 3: The UE discards the received DL user data packet.
Option 4: The UE sends an error message to the network indicating that it cannot derive an uplink packet filter.
Explanation: According to the specified behavior, when the UE receives a DL user data packet with a QFI and an RQI but is unable to derive an uplink packet filter from the DL packet, it ignores the RQI and proceeds to handle the received DL user data packet. This ensures that the UE can still process the DL packet even if the RQI cannot be used for uplink packet filtering.