Transfer of Emergency Services Session Between Disparate Subsystems

• US 20160142896A1
• Filed: 01/26/2016
• Published: 05/19/2016
• Est. Priority Date: 06/12/2006
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Mahdi, Kaniz
• Granted Patent: US 9,854,421 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 67/148 Migration or transfer of sessions
• CPC Class Codes: H04W 36/0022 for transferring data sessions between adjacent core network technologies
• CPC Class Codes: H04W 36/00226 wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
• CPC Class Codes: H04W 4/025 using location based information parameters
• CPC Class Codes: H04W 4/16 Communication-related supplementary services, e.g. call-transfer or call-hold
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 76/50 for emergency connections

Abstract

Methods and nodes for coordinating communication sessions are described herein. A method includes providing, by a control system, a signaling anchor point at a domain transfer function in a visited multimedia subsystem for an access signaling leg and a remote access signaling leg for a communication session between a user element and a public service access point and coordinating call signaling for the communication session via the access signaling leg and the remote signaling leg.

Claims

1. A method comprising:

providing, by a control system, a signaling anchor point at a domain transfer function in a multimedia subsystem for a first access signaling leg and a remote access signaling leg for an emergency services session between a user element and a public service access point (PSAP), wherein the domain transfer function is inserted in the signaling path to anchor the first access leg signaling leg and the remote signaling leg;

wherein the first access signaling leg is provided toward the user element via a transferring-out subsystem;

establishing, by the control system, the emergency services session in response to receiving a session initiation message originating from the user element, wherein the session initiation includes location information for the user element;

coordinating, by the control system, call signaling for the communication session via the first access signaling leg and the remote signaling leg;

receiving, by the control system, a session initiation message responsive to initiation of a new communication session via a transferring-in subsystem to effect a transfer from a transferring-out subsystem to the transferring-in subsystem;

detecting, by the control system, an existence of the communication session with the user element when the session initiation message is received; and

associating, by the control system, a second access signaling leg with the remote access signaling leg, and releasing the first access signaling leg session in response to the detecting the existence of the communication session.

2. The method of claim 1, further comprising sending, by the control system, an update message on the remote leg toward the PSAP to update the communication information for the bearer path.

3. The method of claim 1, further comprising establishing, by the control system, the second access signaling leg for the communication session.

4. The method of claim 1, further comprising coordinating, by the control system, call signaling exchanges for the communication session via the second access signaling leg and the remote signaling leg after the transfer to the transferring-in subsystem.

5. The method of claim 1, further comprising establishing, by the control system, the remote signaling leg for the emergency services session toward the PSAP.

6. The method of claim 1, wherein the transferring-out subsystem is a packet based subsystem, and the transferring-in subsystem is a circuit-switched subsystem.

7. The method of claim 1 further comprising selecting, by the control system, the public service access point based on the location information for the user element.

8. A non-transitory computer-readable medium storing software instructions executable by a multimedia subsystem for coordinating an emergency services session, wherein the software instructions are configured to, when executed, cause the multimedia subsystem to:

provide a signaling anchor point for a first access signaling leg and a remote access signaling leg for the emergency services session between a user element and a public service access point (PSAP), wherein the domain transfer function is inserted in the signaling path to anchor the first access leg signaling leg and the remote signaling leg;

wherein the first access signaling leg is provided toward the user element via a transferring-out subsystem;

establish the emergency services session in response to receiving a session initiation message originating from the user element, wherein the session initiation includes location information for the user element;

coordinate call signaling for the communication session via the first access signaling leg and the remote signaling leg;

receive a session initiation message responsive to initiation of a new communication session via a transferring-in subsystem to effect a transfer from a transferring-out subsystem to the transferring-in subsystem;

detect an existence of the communication session with the user element when the session initiation message is received; and

associate a second access signaling leg with the remote access signaling leg, and releasing the first access signaling leg session in response to the detecting the existence of the communication session.

9. The non-transitory computer-readable medium of claim 8, wherein the software instructions are further configured to cause the multimedia subsystem to send an update message on the remote leg toward the PSAP to update the communication information for the bearer path.

10. The non-transitory computer-readable medium of claim 8, wherein the software instructions are further configured to cause the multimedia subsystem to establish the second access signaling leg for the communication session.

11. The non-transitory computer-readable medium of claim 8, wherein the software instructions are further configured to cause the multimedia subsystem to coordinate call signaling exchanges for the communication session via the second access signaling leg and the remote signaling leg after the transfer to the transferring-in subsystem.

12. The non-transitory computer-readable medium of claim 8, wherein the software instructions are further configured to cause the multimedia subsystem to establish the remote signaling leg for the emergency services session toward the PSAP.

13. The non-transitory computer-readable medium of claim 8, wherein the transferring-out subsystem is a packet based subsystem, and the transferring-in subsystem is a circuit-switched subsystem.

14. The non-transitory computer-readable medium of claim 8, wherein the software instructions are further configured to cause the multimedia subsystem to select the public service access point based on the location information for the user element.

15. A node comprising:

a communication interface; and

a control system associated with the communication interface and configured to;

provide a signaling anchor point at a domain transfer function in a multimedia subsystem for a first access signaling leg and a remote access signaling leg for the emergency services session between a user element and a public service access point (PSAP), wherein the domain transfer function is inserted in the signaling path to anchor the first access leg signaling leg and the remote signaling leg;

wherein the first access signaling leg is provided toward the user element via a transferring-out subsystem;

establish the emergency services session in response to receiving a session initiation message originating from the user element, wherein the session initiation includes location information for the user element;

coordinate call signaling for the communication session via the first access signaling leg and the remote signaling leg;

receive a session initiation message responsive to initiation of a new communication session via a transferring-in subsystem to effect a transfer from a transferring-out subsystem to the transferring-in subsystem;

detect an existence of the communication session with the user element when the session initiation message is received; and

associate a second access signaling leg with the remote access signaling leg, and releasing the first access signaling leg session in response to the detecting the existence of the communication session.

16. The node of claim 15, the node further configured to send an update message on the remote leg toward the PSAP to update the communication information for the bearer path.

17. The node of claim 15, the node further configured to establish the second access signaling leg for the communication session.

18. The node of claim 15, the node further configured to coordinate call signaling exchanges for the communication session via the second access signaling leg and the remote signaling leg after the transfer to the transferring-in subsystem.

19. The node of claim 15, the node further configured to establish the remote signaling leg for the emergency services session toward the PSAP.

20. The node of claim 15, wherein the transferring-out subsystem is a packet based subsystem, and the transferring-in subsystem is a circuit-switched subsystem.