Patent ID: 11910488
Assignee: nan
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method comprising:
maintaining a Protocol data unit (PDU) session by a user equipment (UE) in a 5G system (5GS) of a mobile communication network, wherein the UE supports a local IP address in Traffic Flow Template (TFT) feature for the PDU session;
converting the PDU session in 5GS to a packet data network (PDN) connection upon switching from 5GS to an evolves packet system (EPS), wherein the UE assumes the network supports the local IP address in TFT feature for the PDN connection;
receiving a modify EPS bearer context request or a activate dedicated EPS bearer context request message carrying a TFT information element (IE) from the network, wherein the TFT IE carries a TFT operation code and includes a local IP address; and
executing the TFT operation code including the local IP address without diagnosing an error.