IDENTIFYING PUBLIC SAFETY ANSWERING POINT (PSAP) CALLBACKS IN INTERNET PROTOCOL (IP) MULTIMEDIA SUBSYSTEM (IMS) EMERGENCY SERVICES

• US 20120184238A1
• Filed: 01/12/2012
• Published: 07/19/2012
• Est. Priority Date: 01/14/2011
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Patel, Milan
• Granted Patent: US 8,565,714 B2
• Time in Patent Office: Days
• US Class Current: 455/404.1
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1043 Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
• CPC Class Codes: H04L 65/1045 Proxies, e.g. for session initiation protocol [SIP]
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04M 11/04 with alarm systems, e.g. fire, police or burglar alarm systems
• CPC Class Codes: H04M 3/42195 Arrangements for calling back a calling subscriber when the wanted subscriber ceases to be busy H04M3/48
• CPC Class Codes: H04M 3/5116 for emergency applications
• CPC Class Codes: H04M 7/123 where the packet-switched network is an Internet Protocol Multimedia System-type network
• 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

A method and apparatus for identifying public safety answering point (PSAP) callbacks by transmitting, by a wireless transmit/receive unit (WTRU) in a first network, a registration message, to a PSAP in a second network. Upon registration, the WTRU receives a registration response including an information element (IE) and stores the IE. The PSAP, which may be located in either an internet protocol (IP) Network or a public switched telephone network (PSTN), transmits an emergency callback to the WTRU and includes the IE.

Claims

1. A method for use in a wireless transmit/receive unit (WTRU), the method comprising:

transmitting, by the WTRU in a first network, a registration message to a service call session control function (S-CSCF) in a second network;

receiving, by the WTRU, a registration response including an information element (IE) including a public safety answering point (PSAP) callback identifier, wherein the IE is stored by the WTRU;

transmitting, by the WTRU, an emergency call to the PSAP in the second network, wherein the emergency call includes the PSAP callback identifier; and

receiving, by the WTRU, a callback from the PSAP, wherein the PSAP callback includes the PSAP callback identifier.

2. The method of claim 1, wherein the registration message is an emergency registration request that includes authentication information.

3. The method of claim 1, wherein the registration message is transmitted via a proxy call session control function (P-CSCF).

4. The method of claim 1, wherein the registration response is received prior to transmission of the emergency call.

5. The method of claim 1, wherein the second network is an internet protocol (IP) Multimedia Subsystem (IMS) Network.

6. The method of claim 1, wherein the second network is a public switched telephone network (PSTN).

7. A wireless transmit/receive unit (WTRU) comprising:

a transmitter configured to transmit a registration message to a service call session control function (S-CSCF) in a second network; and

a receiver configured to receive a registration response including an information element (IE) including a public safety answering point (PSAP) callback identifier, wherein the IE is stored by the WTRU; and

wherein the transmitter is further configured to transmit an emergency call to the PSAP in the second network, wherein the emergency call includes the PSAP callback identifier;

wherein the receiver is further configured to receive a callback from the PSAP, wherein the callback includes the PSAP callback identifier;

wherein the WTRU is located in a first network.

8. The WTRU of claim 7 wherein the registration message is an emergency registration request that includes authentication information.

9. The WTRU of claim 7 wherein the registration message is transmitted via a proxy call session control function (P-CSCF).

10. The WTRU of claim 7 wherein the registration response is received prior to transmission of an emergency call.

11. The WTRU of claim 7 wherein the second network is an internet protocol (IP) Multimedia Subsystem (IMS) Network.

12. The WTRU of claim 7 wherein the second network is a public switched telephone network (PSTN).

13. A public safety answering point (PSAP) comprising:

a processor configured to generate an information element (IE) including a PSAP callback identifier;

a receiver configured to receive an emergency call from a wireless transmit/receive unit (WTRU) in a first network, wherein the emergency call includes the PSAP callback identifier; and

a transmitter configured to transmit a callback, wherein the callback includes the PSAP callback identifier;

wherein the PSAP is located in a second network.

14. A proxy call session control function (P-CSCF) comprising:

a receiver configured to receive a registration message from a wireless transmit/receive unit (WTRU) in a first network;

a transmitter configured to transmit the registration message to a service call session control function (S-CSCF) in a second network;

the receiver further configured to receive a registration response including an information element (IE) including a public safety answering point (PSAP) callback identifier, wherein the IE is stored by the P-CSCF; and

wherein the receiver is further configured to receive an emergency call from the WTRU in the first network, wherein the emergency call includes the PSAP callback identifier, and receive a callback from the PSAP, wherein the callback includes the PSAP callback identifier;

wherein the transmitter is further configured to transmit the emergency call to the PSAP in the second network, and transmit the callback to the WTRU;

wherein the P-CSCF is located in the first network.

15. The P-CSCF of claim 14 wherein the WTRU inserts the PSAP callback identifier in the emergency call.

16. The P-CSCF of claim 14 wherein the P-CSCF inserts the PSAP callback identifier in the emergency call.