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Hard handoff from a wireless local area network to a cellular telephone network

  • US 20070049274A1
  • Filed: 09/01/2005
  • Published: 03/01/2007
  • Est. Priority Date: 09/01/2005
  • Status: Abandoned Application
First Claim
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1. In a multi-mode portable user terminal (UT), a method for supporting a hard handoff procedure for a call from a wireless local area network (WLAN) to a cellular telephone network, the method comprising:

  • establishing a link between a UT and a serving WLAN;

    establishing a call via the established WLAN link;

    simultaneously monitoring a serving cellular telephone network;

    forwarding information identifying the UT within the cellular network, to the serving WLAN;

    in response to losing the link with the serving WLAN, performing a hard handoff to the cellular network; and

    continuing the call via the cellular network.

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