US 11,910,488 B2
Enhancement of feature support after interworking
Chien-Chun Huang-Fu, Hsin-Chu (TW); Chi-Hsien Chen, Hsin-Chu (TW); Po-Ying Chuang, Hsin-Chu (TW); and Po Kuang Lu, Hsin-Chu (TW)
Filed by MEDIATEK INC., Hsin-Chu (TW)
Filed on Mar. 3, 2023, as Appl. No. 18/117,390.
Application 18/117,390 is a continuation of application No. 16/838,186, filed on Apr. 2, 2020, granted, now 11,622,415.
Claims priority of provisional application 62/827,914, filed on Apr. 2, 2019.
Prior Publication US 2023/0209654 A1, Jun. 29, 2023
Int. Cl. H04W 80/10 (2009.01); H04W 8/08 (2009.01); H04W 28/02 (2009.01)
CPC H04W 80/10 (2013.01) [H04W 8/08 (2013.01); H04W 28/0247 (2013.01); H04W 28/0263 (2013.01)] 8 Claims
OG exemplary drawing
 
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.