SYSTEM AND METHOD FOR IMS PDN RECOVERY

• US 20200137641A1
• Filed: 10/24/2019
• Published: 04/30/2020
• Est. Priority Date: 10/24/2018
• Status: Active Grant

• Current Assignee: Jio Platforms Ltd.
• Original Assignee: Reliance Jio Infocomm Limited (Jio Platforms Ltd.)
• Inventors: CHAUHAN, Devesh, SINGH, Mukesh, MARNI, Veera Sai Satyanarayana Prasad, SHRIVASTAVA, Abhilash
• Granted Patent: US 11,503,511 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04W 48/17 Selecting a data network PoA [Point of Attachment]
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 60/06 De-registration or detaching
• CPC Class Codes: H04W 76/12 Setup of transport tunnels
• CPC Class Codes: H04W 76/18 Management of setup rejection or failure

Abstract

A system and method, for identification of the user equipment with IMS PDN connectivity issues, and proactively recovering the PDN connectivity for said user equipment is disclosed. The disclosure provides triggering the System initiated detach with re-attach required request, to user equipment by checking the current IMS PDN state of said VoLTE user equipment to recover the IMS PDN connectivity. The present disclosure provides a novel automatic method for maintaining IMS PDN connection providing continuous voice call connectivity and improving the overall connectivity and user experience of the wireless network.

Claims

1. A method for IMS PDN recovery, the method comprising:

receiving, from a user equipment, at a system, one of a attach request with default Internet APN and a PDN disconnect request with IMS APN;

initiating a timer by the system, for a finite period of time, wherein said timer is initiated upon said receiving of one of a attach request with default Internet APN and a PDN disconnect request with IMS APN;

detecting, upon expiry of said timer, by the system, the absence of a PDN connectivity request with IMS APN from the user equipment;

transmitting by the system, a detach request with re-attach required, to the user equipment in an event of absence of an IMS bearer between the user equipment and the system;

receiving at the system, a detach accept from the user equipment, in response to said detach request; and

recovering, by the system, the IMS PDN connection by receiving an initial attach and a PDN connectivity request with IMS PDN from the user equipment.

2. The method as claimed in claim 1, further comprising determining if the user equipment is VoLTE capable, comprising:

determining a usage setting of the user equipment, wherein the usage setting is one of a voice-centric and a data-centric;

determining a voice domain preference of the user equipment, wherein the voice domain preference is one of an IMS PS voice only, an IMS PS voice preferred—

CS voice as secondary, a CS only, a CS voice Preferred—

IMS PS voice as secondary; and

identifying the user equipment as VoLTE capable in an event said usage setting is the voice-centric and said voice domain preference is one of the IMS PS voice only and IMS PS voice preferred—

CS voice as secondary.

3. The method as claimed in claim 1, wherein transmitting by the system, the detach request with re-attach required, to the user equipment in an event of absence of an IMS bearer between the user equipment and the system, further comprises:

maintaining by the system, a retry count value and a predefined retry count threshold;

incrementing the retry count value upon transmitting the detach request with re-attach required, until the retry count value is less than said predefined retry count threshold.

4. The method as claimed in claim 1 wherein the timer is one of a pre-defined timer and a configurable timer.

5. The method as claimed in claim 1 further comprising:

automatically predicting the absence of a PDN connectivity request with IMS APN from the user equipment using artificial intelligence; and

pro-actively transmitting the detach request with re-attach required in response to said prediction.

6. The method as claimed in claim 1, wherein transmitting by the system, the detach request with re-attach required, to the user equipment is further based on checking of IMS APN presence in Wi-Fi network.

7. A system for IMS PDN recovery, the system comprising:

a receiver unit, configured to receive from a user equipment, one of an attach request with default Internet APN and a PDN disconnect request with IMS APN;

a processor connected to said receiver unit, the processor configured to;

initiate a timer, for a finite period of time, wherein the said timer is initiated upon said receiving of one of the attach request with default Internet APN and the PDN disconnect request with IMS APN;

detect, upon expiry of said timer, the absence of a PDN connectivity request with IMS APN from the user equipment;

a transmitter unit connected to said processor and receiver unit, the transmitter unit configured to transmit a detach request with re-attach required, to the user equipment in an event of absence of an IMS bearer between the user equipment and the system;

wherein the receiver unit is further configured to receive, a detach accept from user equipment, in response to said detach request; and

the processor is further configured to recover IMS PDN connection by receiving an initial attach request and a PDN connectivity request with IMS PDN from the user equipment.

8. The system as claimed in claim 7, wherein said processor is further configured to determine if the user equipment is VoLTE capable, said determination being achieved by:

determining a usage setting of the user equipment, wherein the usage setting is one of a voice-centric and a data-centric;

determining a voice domain preference of the user equipment, wherein the voice domain preference is one of an IMS PS voice only, an IMS PS voice preferred—

CS voice as secondary, a CS only and a CS voice Preferred—

IMS PS voice as secondary; and

identifying the user equipment as VoLTE capable in an event said usage setting is the voice-centric and said voice domain preference is one of the IMS PS voice only and the IMS PS voice preferred—

CS voice as secondary.

9. The system as claimed in claim 7, wherein in an event of transmission of the detach request with re-attach required to the user equipment, in absence of an IMS bearer between the user equipment and the system, said processor is further configured to:

maintain, a retry count value and a predefined retry count threshold; and

increment the retry count value upon transmitting the detach request with re-attach required, until the retry count value is less than said predefined retry count threshold.

10. A method for IMS PDN recovery, the method comprising:

transmitting, by a user equipment, to a system, one of an attach request with default Internet APN and a PDN disconnect request with IMS APN, wherein

in response to said one of the attach request with default Internet APN and the PDN disconnect request with IMS APN, the system initiates a timer for a finite period of time, and

upon expiry of said timer, the system detects the absence of a PDN connectivity request with IMS APN from a user equipment;

receiving, from the system at the user equipment, a detach request with re-attach required, in an event of absence of an IMS bearer between the user equipment and the system;

transmitting, by the user equipment, a detach accept to the system, in response to said detach request; and

recovering IMS PDN connection by initiating an initial attach and transmitting a PDN connectivity request with IMS PDN from the user equipment to the system.

11. A user equipment for IMS PDN recovery, the user equipment comprising:

a transceiver reconfigured to;

transmit, to a system, one of an attach request with default Internet APN and a PDN disconnect request with IMS APN, wherein in response to said one of the attach request with default Internet APN and the PDN disconnect request with IMS APN, the system initiates a timer for a finite period of time, and

upon expiry of said timer, the system detects the absence of a PDN connectivity request with IMS APN from the user equipment;

receive, from the system, a detach request with re-attach required, in an event of an absence of an IMS bearer between the user equipment and the system;

transmit, a detach accept to system, in response to said detach request; and

recover IMS PDN connection by initiating an initial attach and transmitting a PDN connectivity request with IMS PDN.