Patent ID: 11937140
Assignee: APPLE INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. An apparatus, comprising:
at least one processor configured to cause a user equipment (UE) to:
establish a cellular link that provides access to a fifth generation core (5GC) network;
establish a protocol data unit (PDU) session with a cellular network entity of the 5GC network;

receive, from the cellular network entity, signaling indicating one or more quality of service (QoS) flow descriptions for the PDU session;
determine that the PDU session may flow at least in part between the UE and a long term evolution (LTE) base station; and
transmit, based at least in part on the determination that the PDU session may flow at least in part between the UE and the LTE base station, a request to the cellular network entity of the 5GC network to modify the one or more QoS flow descriptions for the PDU session; and
receive a PDU session modification reject message in response to the request for modification, wherein the PDU session modification reject message includes a cause code for invalid mapped evolved packet service (EPS) bearer QoS, and wherein the invalid mapped EPS bearer QoS is associated with an incorrect QoS;
provide a service request to the 5GC network, wherein the service request is for one or more network services or applications that are not supported by the 5GC network but are supported by an evolved packet core (EPC) network; and
receive a PDU session release message indicating to release the PDU session, wherein the PDU session release message includes a cause code indicating to fallback to evolved packet service (EPS), and wherein the PDU session release message further includes a mapped EPS bearer context information element indicating EPS bearer mapping information for the PDU session.