Proxy-call session control function (P-CSCF)

Patent metadata

Field	Value
Publication number	US-12192251-B2
Application number	US-202117500845-A
Country	US
Kind code	B2
Filing date	Oct 13, 2021
Priority date	Oct 13, 2021
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

Solutions for providing a data traffic session with proxy-call session control function (P-CSCF) restoration include: receiving an indication, by an application server (AS), that a user equipment (UE) is registered with a first proxy node; receiving, at a subscriber information node, from a call session control function (e.g., over an N70 interface), a first message triggering proxy node restoration; based on at least receiving the first message triggering proxy node restoration, transmitting, by the subscriber information node, to a management node, a second message triggering proxy node restoration; receiving an indication, by the AS, that the UE is registered with a second proxy node different than the first proxy node; and based on at least receiving a session initiation message, establishing the data traffic session for the UE with the second proxy node.

First claim

What is claimed is:

1. A method of providing a data traffic session, the method comprising:
receiving, by a unified data management function (UDM), a proxy-call session control function (P-CSCF) restoration indication over a single N70 interface extending directly between the UDM and a serving-call session control function (S-CSCF);
based on at least receiving the SIP message, transmitting, by the UDM, the P-CSCF restoration indication to a session management function (SMF) responsive to receiving the P-CSCF restoration indication over the single N70 interface;
based on at least receiving the P-CSCF restoration indication, sending, from the SMF to a user equipment (UE), an internet protocol (IP) messaging system (IMS) Packet Data Network (PDN) connection release message instructing the UE to release registration with a first P-CSCF and re-register with a second P-CSCF that is different than the first P-CSCF;
receiving an indication, by an application server (AS), that the UE is registered with the second P-CSCF; and
based on at least receiving a session initiation message, establishing the data traffic session for the UE with the second P-CSCF.

2. The method of claim 1 , wherein the AS comprises a telephony application server (TAS).

3. The method of claim 1 , further comprising:
based on at least receiving an indication that the first P-CSCF is unavailable, transmitting, by the S-CSCF, the P-CSCF restoration indication over the single N70 interface to the UDM.

4. The method of claim 3 , wherein the indication that the first P-CSCF is unavailable comprises a time-out without a response from the first P-CSCF.

5. The method of claim 3 , wherein the indication that the first P-CSCF is unavailable comprises a message from the first P-CSCF.

6. The method of claim 1 , further comprising:
releasing, by the UE, a connection to the first P-CSCF; performing, by the UE, a proxy node discovery with a status repository; and registering, by the UE, with the second P-CSCF.

7. The method of claim 6 , wherein the status repository comprises a network repository function (NRF).

8. A system comprising:
processor(s); and
computer-readable medium storing programming instructions that, when executed by the processor(s), cause the processor(s) to:
receive, by a unified data management function (UDM), a proxy-call session control function (P-CSCF) restoration indication over a single N70 interface extending directly between the UDM and a serving-call session control function (S-CSCF);
transmit, by the UDM, the P-CSCF restoration indication to a session management function (SMF) responsive to receiving the P-CSCF restoration indication over the single N70 interface;
based on at least receiving the P-CSCF restoration indication, send, from the SMF to a user equipment (UE), an internet protocol (IP) messaging system (IMS) Packet Data Network (PDN) connection release message instructing the UE to release registration with a first P-CSCF and re-register with a second P-CSCF that is different than the first P-CSCF;
receive an indication, by an application server (AS), that the UE is registered with the second P-CSCF; and
based on at least receiving a session initiation message, establish a data traffic session for the UE with the second P-CSCF.

9. The system of claim 8 , wherein the AS comprises a telephony application server (TAS).

10. The system of claim 8 , wherein the programming instructions for cause the processor(s) to transmit by the S-CSCF, P-CSCF restoration indication over the single N70 interface to the UDM based at least on receiving an indication that the first P-CSCF is unavailable.

11. The system of claim 10 , wherein the indication that the first P-CSCF is unavailable comprises a time-out without a response from the first P-CSCF.

12. The system of claim 10 , wherein the indication that the first P-CSCF is unavailable comprises a message from the first P-CSCF.

13. The system of claim 10 , wherein the programming instructions further cause the processor(s) to:
release, by the UE, a connection to the first P-CSCF; perform, by the UE, a proxy node discovery with a status repository; and register, by the UE, with the second P-CSCF.

14. The system of claim 13 , wherein the status repository comprises a network repository function (NRF).

15. A method of providing a data traffic session, the method comprising:
receiving, by a unified data management function (UDM), a proxy-call session control function (P-CSCF) restoration indication over a single N70 interface extending directly between the UDM and a serving-call session control function (S-CSCF); and
transmitting, by the UDM, the P-CSCF restoration indication to a session management function (SMF) responsive to receiving the P-CSCF restoration indication over the single N70 interface, wherein the P-CSCF restoration indication prompts the SMF to send an internet protocol (IP) messaging system (IMS) Packet Data Network (PDN) connection release message instructing a user equipment (UE) to release registration with a first P-CSCF, to re-register with a second P-CSCF that is different than the first P-CSCF, and to notify an application server (AS) that the UE is registered with the second P-CSCF, and wherein notifying the AS that the UE is registered with the second P-CSCF triggers establishment of the data traffic session for the UE with the second P-CSCF.

16. The method of claim 15 , wherein the AS comprises a telephony application server (TAS).

17. The method of claim 15 , wherein the S-CSCF transmits the P-CSCF restoration indication over the single N70 interface in response to receiving an indication that the first P-CSCF is unavailable.

18. The method of claim 15 , wherein the indication that the first P-CSCF is unavailable comprises a time-out without a response from the first P-CSCF.

19. The method of claim 15 , wherein the indication that the first P-CSCF is unavailable comprises a message from the first P-CSCF.

Assignees

• T Mobile Usa Inc

Inventors

• Sabeur Nassereddine
• Badar Saqib
• Mufti Shujaur
• Arends Joel
• Kaushik Subramania

Classifications

• H04L65/1073

  Registration or de-registration · CPC title

• H04L41/0654

  using network fault recovery (ring fault isolation or reconfiguration in loop networks without recovery actions by a network management system H04L12/437) · CPC title

• H04L65/1104

  Session initiation protocol [SIP] · CPC title

• H04L65/1069 Primary

  Session establishment or de-establishment · CPC title

• H04L65/1045

  Proxies, e.g. for session initiation protocol [SIP] · CPC title