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Method and apparatus for media independent handover

  • US 8,537,775 B2
  • Filed: 03/14/2008
  • Issued: 09/17/2013
  • Est. Priority Date: 03/15/2007
  • 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 registering with a Call Session Control Function (CSCF) in an Internet Protocol (IP) Multimedia Subsystem (IMS) via a first wireless network of a first network type;

    the WTRU transmitting a first session initiation protocol (SIP) message to an application server in the IMS via the first wireless network, wherein the first SIP message includes a media independent handover (MIH) message; and

    the WTRU establishing an application session with a second WTRU via the first wireless network;

    the WTRU communicating with the second WTRU according to the application session via the first wireless network using a first Internet Protocol (IP) address;

    the WTRU performing a handover from the first wireless network to a second wireless network of a second network type;

    the WTRU obtaining a second IP address for communicating in the second wireless network;

    the WTRU transmitting a second SIP message via the second wireless network for continuing the application session in the second wireless network, wherein the second SIP message indicates the second IP address; and

    the WTRU communicating with the second WTRU according to the application session via the second wireless network using the second IP address.

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