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Method and system for switching a radio access technology between wireless communication systems with a multi-mode wireless transmit/receive unit

  • US 9,380,501 B2
  • Filed: 04/11/2011
  • Issued: 06/28/2016
  • Est. Priority Date: 03/12/2004
  • Status: Expired due to Fees
First Claim
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1. A method for use in a wireless transmit/receive unit (WTRU), the method comprising:

  • the WTRU receiving a service from a core network via a cellular radio access network;

    the WTRU evaluating a predetermined criteria for inter-system handoff;

    the WTRU sending a first message via the cellular radio access network, wherein the first message indicates that the WTRU is capable of communicating using wireless local area network (WLAN) technology;

    the WTRU receiving a second message via the cellular radio access network based on a condition that the predetermined criteria for inter-system handoff is satisfied, wherein the second message is responsive to the first message and includes identifiers of at least one wireless network that is appropriate for inter-system handoff of the WTRU;

    the WTRU selecting, from the at least one wireless network, a first wireless network for handover in response to the second message, wherein the first wireless network has a connection to the core network and is configured to inter-work with the core network, such that the service may be forwarded from the core network to the WTRU through the first wireless network, thereby continuing the service to the WTRU;

    the WTRU performing the handover to the first wireless network, wherein performing the handover comprises the WTRU changing a first IP address of the WTRU that is associated with the cellular radio access network to a second IP address that is associated with the first wireless network; and

    the WTRU receiving the service from the core network via the first wireless network.

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