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Emergency call handoff between heterogeneous networks

  • US 8,886,155 B2
  • Filed: 01/13/2014
  • Issued: 11/11/2014
  • Est. Priority Date: 07/15/2011
  • Status: Active Grant
First Claim
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1. A method performed by a network device, the method comprising:

  • determining that a request received at the network device includes a first indication that an emergency call, initiated by a user device and routed from a source base station in a long term evolution (LTE) network to a public safety access point (PSAP) via a first gateway device serving the source base station, is to be handed off to a target base station associated with a non-LTE network;

    transmitting, from the network device to a server device and responsive to the first indication, a request for context information associated with the user device, the source base station, and the first gateway device;

    obtaining, at the network device and from a response to the request for context information, information identifying the first gateway device;

    transmitting, from the network device to a second gateway device serving the target base station, a bearer request including the information identifying the first gateway device;

    receiving, at the network device, a second indication that a connection between the first gateway device and the second gateway device has been established for transfer of the emergency call to the PSAP; and

    transmitting, from the network device and responsive to the second indication, an instruction to the source base station to handoff the emergency call to the target base station.

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