Quality of service flow to data radio bearer mapping override bit

1. An apparatus of a user equipment (UE), comprising:

one or more data storage devices configured to store data corresponding to mapping of QoS flows to data radio bearers; and

one or more processors operably coupled to the one or more data storage devices, the one or more processors configured to:

map one or more quality of service (QoS) flows to a data radio bearer (DRB) in an uplink (UL) responsive to receipt, by the UE from a cellular base station, of a user plane packet associated with the one or more QoS flows in a downlink (DL) through the DRB if an override bit of the user plane packet indicates that reflective mapping, wherein the UE is to use a same DRB for the one or more QoS flows in the UL as was used to receive the user plane packet associated with the one or more QoS flows in the DL, should apply; and

not map the one or more QoS flows to the DRB in the UL if the override bit of the user plane packet indicates that the UE should ignore the reflective mapping.

2. The apparatus of claim 1 , wherein the one or more processors are configured to map the one or more QoS flows to the DRB by switching from the one or more QoS flows being previously mapped to another DRB to the one or more QoS flows being mapped to the DRB responsive to the user plane packet.

3. The apparatus of claim 1 , wherein the one or more processors are configured to map the one or more QoS flows to any of a plurality of different DRBs in the UL responsive to explicit instructions received from the cellular base station.

4. The apparatus of claim 3 , wherein the explicit instructions are received in a Radio Resource Control (RRC) signal from the cellular base station.

5. The apparatus of claim 3 , wherein the one or more processors are configured to perform an initial mapping of the one or more QoS flows to one of the plurality of different DRBs in the UL responsive to the explicit instructions received from the cellular base station.

6. The apparatus of claim 1 , wherein the one or more processors are configured to perform an initial mapping of the one or more QoS flows to one of a plurality of different DRBs in the UL responsive to receipt of an initial user plane packet in the DL through the one or more QoS flows if the override bit of the user plane packet indicates that the reflective mapping should apply.

7. The apparatus of claim 1 , wherein the user plane packet includes a reflective mapping packet that is transmitted to the UE for the purpose of reflective mapping rather than for the purpose of transmitting data in a payload of the reflective mapping packet.

8. The apparatus of claim 1 , wherein the one or more processors are configured to switch from using explicit mapping to using reflective mapping responsive to the override bit indicating that reflective mapping should apply.

9. The apparatus of claim 1 , wherein the one or more processors are configured to switch from using reflective mapping to using explicit mapping responsive to the override bit indicating that the UE should ignore the reflective mapping.

10. The apparatus of claim 1 , wherein the user plane packet includes data corresponding to a transmission control protocol (TCP) acknowledgment (ACK).

11. The apparatus of claim 1 , wherein the user plane packet includes data corresponding to one or more video frames.

12. The apparatus of claim 1 , wherein the user plane packet includes a dummy packet transmitted by the RAN node.

13. An apparatus of a user equipment (UE), comprising:

a cellular radio configured to receive, from a radio access network (RAN) node of a cellular data network, in a downlink (DL), a user plane packet through a first data radio bearer (DRB), the user plane packet corresponding to a QoS flow, the user plane packet including an override bit configured to indicate whether reflective mapping, wherein the UE is to use a same DRB for the QoS flow in an uplink (UL) as is used to receive the user plane packet corresponding to the QoS flow in the DL, should take precedence over explicit mapping for the QoS flow; and

one or more processors operably coupled to the cellular radio, the one or more processors configured to:

map the QoS flow to the first DRB in the UL if the override bit indicates that the reflective mapping of the QoS flow to the first DRB should take precedence over the explicit mapping; and

not map the QoS flow to the first DRB in the UL if the override bit indicates that the reflective mapping of the QoS flow to the first DRB should not take precedence over the explicit mapping.

14. The apparatus of claim 13 , wherein the one or more processors are configured to map the QoS flow to a second DRB in the UL if the cellular radio receives explicit signaling from the RAN node that indicates that the QoS flow should be mapped to the second DRB in the UL and the override bit of the user plane packet indicates that the reflective mapping of the QoS flow to the first DRB should not take precedence over the explicit signaling.

15. The apparatus of claim 13 , wherein the one or more processors are configured to switch an explicit mapping of the QoS flow to a second DRB to a reflective mapping of the QoS flow to the first DRB responsive to the user plane packet if the override bit indicates that the reflective mapping of the QoS flow to the first DRB should take precedence over the explicit mapping.

16. The apparatus of claim 13 , wherein the one or more processors are configured to maintain an explicit mapping of the QoS flow to a second DRB responsive to the user plane packet if the override bit indicates that the reflective mapping of the QoS flow to the first DRB should not take precedence over the explicit mapping.

17. The apparatus of claim 16 , wherein the user plane packet includes data corresponding to a transmission control protocol (TCP) acknowledgment (ACK).

18. The apparatus of claim 16 , wherein the user plane packet includes data corresponding to one or more video frames.

19. The apparatus of claim 13 , wherein the user plane packet includes a dummy packet transmitted by the RAN node.

20. An apparatus of a radio access network (RAN) node, comprising:

one or more data storage devices configured to store data corresponding to mapping of quality of service (QoS) flows to data radio bearers (DRBs); and

one or more processors configured to encode a user plane packet corresponding to a QoS flow to be transmitted to a user equipment (UE) through a DRB, the user plane packet including an override bit, the override bit configured to indicate to the UE whether reflective mapping, wherein the UE is to use a same DRB for the QoS flow in an uplink (UL) as was used to receive the user plane packet corresponding to the QoS flow in the downlink (DL), should take precedence over explicit mapping of the QoS flow to one of the DRBs.

21. The apparatus of claim 20 , wherein the user plane packet includes data corresponding to a transmission control protocol (TCP) acknowledgment (ACK).

22. The apparatus of claim 20 , wherein the user plane packet includes data corresponding to one or more video frames.

23. The apparatus of claim 20 , wherein the user plane packet comprises a dummy packet configured to instruct the UE regarding reflective mapping rather than deliver a data payload to the UE.

24. The apparatus of claim 20 , wherein the one or more processors are configured to encode a radio resource control (RRC) message to be transmitted to the UE, the RRC message configured to explicitly indicate mapping of the QoS flows to the DRBs in the UL.