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Handoff method and agent apparatus

  • US 20020045450A1
  • Filed: 07/09/2001
  • Published: 04/18/2002
  • Est. Priority Date: 10/18/2000
  • Status: Abandoned Application
First Claim
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1. A handoff method of performing a handoff when mobile terminal equipment is moving from a previous foreign agent to a new foreign agent in a mobile IP network, said method comprising the steps of:

  • when starting a handoff, additionally performing a regional registration of said mobile terminal equipment so as to doubly register said mobile terminal equipment so that said mobile terminal equipment is associated with both said previous foreign agent and said new foreign agent;

    determining whether or not an IP packet destined for said mobile terminal equipment is of real-time traffic when said mobile terminal equipment is doubly registered;

    bicasting the IP packet to both said previous foreign agent and said new foreign agent if the IP packet is of real-time traffic, and buffering the IP packet if the IP packet is of non-real-time traffic;

    when the handoff is completed, updating the regional registration associated with said previous foreign agent so that said mobile terminal equipment is associated only with said new foreign agent; and

    when IP packets of non-real-time traffic are buffered, transferring the buffered IP packets of non-real-time traffic to said new foreign agent.

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