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Maintaining IMS registration while disconnected from IP bearer

  • US 8,195,158 B2
  • Filed: 07/01/2008
  • Issued: 06/05/2012
  • Est. Priority Date: 07/05/2007
  • Status: Active Grant
First Claim
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1. A method implemented by a proxy of maintaining registration in an IP Multimedia Subsystem (IMS) network for a user equipment, the method comprising:

  • receiving an IMS registration request for an IMS network from a user equipment, via an IP connectivity access network (IP-CAN) bearer connecting the user equipment to the proxy;

    opening a proxy session for the user equipment;

    establishing a registration within said IMS network for IMS services on behalf of the user equipment; and

    maintaining the registration for the user equipment for the duration of the proxy session even while an IP-CAN bearer connecting the user equipment to the proxy does not exist.

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