Methods and apparatus to support emergency services connectivity requests through untrusted wireless networks

An apparatus configurable for operation in a wireless communication device, the apparatus comprising:

• memory storing instructions;
• and
• processing circuitry comprising one or more processors that, when executing the instructions, cause the wireless communication device to:
• detect a request to establish an emergency services connection via an untrusted wireless local area network (WLAN);
• de-register from an Internet Protocol Multimedia Subsystem (IMS) server for non-emergency services when the wireless communication device is registered for non-emergency services with the IMS server;
• release existing packet data network (PDN) connections via the untrusted WLAN;
• obtain an Internet Protocol (IP) address for a first evolved packet data gateway (ePDG);
• send to the first ePDG an IKEv2 CFG_REQUEST message that includes in its configuration payload an indication for emergency services to establish a PDN connection with the first ePDG;
• when the first ePDG supports emergency services:
• receive from the first ePDG an IKEv2 CFG_REPLY message that includes in its configuration payload an indication of support for emergency services to establish the PDN connection with the first ePDG;
• and
• establish the PDN connection with the first ePDG without authentication of the wireless communication device;
• and
• when the first ePDG does not support emergency services:
• receive from the first ePDG a message that includes a second IP address for a second ePDG that supports emergency services;
• send to the second ePDG the IKEv2 CFG_REQUEST message that includes in its configuration payload the indication for emergency services to establish the PDN connection with the second ePDG;
• receive from the second ePDG the IKEv2 CFG_REPLY message that includes in its configuration payload the indication of support for emergency services to establish the PDN connection with the second ePDG;
• and
• establish the PDN connection with the second ePDG without authentication of the wireless communication device.

A wireless communication device configurable to request an emergency services connection via an untrusted wireless local area network (WLAN), the wireless communication device comprising:

• wireless circuitry communicatively coupled to one or more antennas;
• one or more processors communicatively coupled to the wireless circuitry;
• and
• a memory communicatively coupled to the one or more processors storing instructions that, when executed by the one or more processors, cause the wireless communication device to:
• detect a request to establish the emergency services connection via the untrusted WLAN;
• de-register from an Internet Protocol Multimedia Subsystem (IMS) server for non-emergency services when the wireless communication device is registered for non-emergency services with the IMS server;
• release existing packet data network (PDN) connections via the untrusted WLAN;
• obtain an Internet Protocol (IP) address for a first evolved packet data gateway (ePDG);
• send to the first ePDG an IKEv2 CFG_REQUEST message that includes in its configuration payload an indication for emergency services to establish a PDN connection with the first ePDG;
• when the first ePDG supports emergency services:
• receive from the first ePDG an IKEv2 CFG_REPLY message that includes in its configuration payload an indication of support for emergency services to establish the PDN connection with the first ePDG;
• and
• establish the PDN connection with the first ePDG without authentication of the wireless communication device;
• and
• when the first ePDG does not support emergency services:
• receive from the first ePDG a message that includes a second IP address for a second ePDG that supports emergency services;
• send to the second ePDG the IKEv2 CFG_REQUEST message that includes in its configuration payload the indication for emergency services to establish the PDN connection with the second ePDG;
• receive from the second ePDG the IKEv2 CFG_REPLY message that includes in its configuration payload the indication of support for emergency services to establish the PDN connection with the second ePDG;
• and
• establish the PDN connection with the second ePDG without authentication of the wireless communication device.