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WIRELESS COMMUNICATION METHOD AND SYSTEM FOR PERFORMING HANDOVER BETWEEN TWO RADIO ACCESS TECHNOLOGIES

  • US 20070213059A1
  • Filed: 03/07/2007
  • Published: 09/13/2007
  • Est. Priority Date: 03/09/2006
  • Status: Abandoned Application
First Claim
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1. In a wireless communication system, including a dual radio access technology (RAT) wireless transmit/receive unit (WTRU), a universal mobile telecommunication system (UMTS) terrestrial radio access network (UTRAN), an evolved-UTRAN (E-UTRAN), a 2nd generation/3rd generation (2G/3G) core network, and a long term evolution (LTE) network, a method of performing handover of the WTRU from E-UTRAN to UTRAN, the method comprising:

  • initiating a handover process, at an access gateway (AGW) based on the measurement reports sent by the WTRU;

    sending a relocation request from the AGW to a target radio network controller located in the target UTRAN;

    allocating resources for the WTRU in the target UTRAN;

    sending a relocation response from the UTRAN to the AGW;

    sending a handover command from the AGW to the WTRU;

    performing an Serving Radio Network Subsystem (SRNS) relocation by sending SRNS context to the target RNC;

    sending a reconfiguration complete message from the WTRU to a target serving general packet radio service (GPRS) Support Node (SGSN);

    releasing the radio resources on the E-UTRAN by sending a release message to the to the E-UTRAN; and

    sending an update packet data protocol (PDP) context from the target SGSN to an access server gateway (ASGW) anchor node.

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