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VERTICAL HANDOVER METHOD FOR OVERLAY COMMUNICATION SYSTEM

  • US 20080085712A1
  • Filed: 09/27/2007
  • Published: 04/10/2008
  • Est. Priority Date: 10/10/2006
  • Status: Active Grant
First Claim
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1. A vertical handover method for an overlay communication system including a plurality of base stations each providing at least one communication network technology to a mobile terminal, comprising:

  • determining if a mobile terminal is located in a measurement region with reference to a vertical handover map in relation to a serving base station;

    detecting reachable base stations by activating all network interfaces when the mobile terminal is located in a measurement region;

    selecting one of the reachable base stations as a handover target base station;

    determining if the mobile terminal is located in a handover region with reference to the vertical handover map; and

    performing a handover if the mobile terminal is located in a handover region.

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