Patent ID: 11864033
Assignee: JIO PLATFORMS LIMITED
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A system for IP Multimedia Core Network Subsystem (IMS) Packet Data Network (PDN) recovery, the system comprising:
a receiver configured to receive, 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;
a processor that is connected to the receiver and configured to:
initiate, 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;
detect, upon expiration of the timer, absence of a PDN connectivity request with IMS APN from the user equipment; and
check whether voice services are provided over a Wi-Fi network and the IMS APN is present in the Wi-Fi network;

a transmitter configured to transmit 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,
wherein the receiver is further configured to receive, a detach accept message from the user equipment, in response to the detach request, and
the processor is further configured to recover the IMS PDN connection by receiving an initial attach request and a PDN connectivity request with IMS PDN from the user equipment.