US 11,864,033 B2
System and method for IMS PDN recovery
Devesh Chauhan, Maharashtra (IN); Mukesh Singh, Maharashtra (IN); Veera Sai Satyanarayana Rasad Marni, Maharashtra (IN); and Abhilash Shrivastava, Maharashtra (IN)
Assigned to JIO PLATFORMS LIMITED, Ahmedabad (IN)
Filed by Jio Platforms Limited, Ahmedabad (IN)
Filed on Oct. 12, 2022, as Appl. No. 18/045,882.
Application 18/045,882 is a continuation of application No. 16/662,470, filed on Oct. 24, 2019, granted, now 11,503,511.
Claims priority of application No. 201821040140 (IN), filed on Oct. 24, 2018.
Prior Publication US 2023/0062500 A1, Mar. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 72/04 (2023.01); H04W 8/02 (2009.01); H04L 65/1016 (2022.01); H04W 36/12 (2009.01); H04W 76/10 (2018.01); H04L 5/00 (2006.01); H04W 36/00 (2009.01); H04W 76/18 (2018.01); H04W 36/14 (2009.01); H04W 76/12 (2018.01); H04W 48/18 (2009.01)
CPC H04W 36/0022 (2013.01) [H04L 65/1016 (2013.01); H04W 36/14 (2013.01); H04W 48/18 (2013.01); H04W 76/12 (2018.02); H04W 76/18 (2018.02)] 17 Claims
OG exemplary drawing
 
1. A method for IP Multimedia Core Network Subsystem (IMS) Packet Data Network (PDN) recovery, the method comprising:
receiving, at a system, from a user equipment, at least one of an attach request with default Internet Access Point Name (APN) or a PDN disconnect request with IMS APN;
initiating, by the system, upon receiving the at least one of the attach request with default Internet APN or the PDN disconnect request with IMS APN, a timer for a finite period of time;
detecting, by the system, upon expiration of the timer, absence of a PDN connectivity request with IMS APN from the user equipment;
checking whether voice services are provided over a Wi-Fi network and the IMS APN is present in the Wi-Fi network;
transmitting, by the system, a detach request with re-attach required, to the user equipment based on the checking in an event of absence of an IMS bearer between the user equipment and the system;
receiving, by the system, a detach accept message from the user equipment, in response to the detach request; and
recovering, by the system, the IMS PDN connection by receiving an initial attach request and a PDN connectivity request with IMS PDN from the user equipment.