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Seamless data network telecommunication service during mobile wireless call handoff

  • US 6,539,225 B1
  • Filed: 06/21/1999
  • Issued: 03/25/2003
  • Est. Priority Date: 06/21/1999
  • Status: Expired due to Term
First Claim
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1. In a data network providing wireless telecommunication service to a mobile wireless node therein by way of addressable communication packets containing customer communication content (“

  • packetized communication content”

    ), the data network being linked to at least two base stations for communicating with the mobile wireless node when it is located in geographic areas respectively served by the base stations, said data network further including a network routing node assigned to said mobile wireless node and serving as a home agent located in a home subnetwork of said mobile wireless node, said home agent being configured to intercept packetized communication content addressed to a home data network address permanently assigned to said mobile wireless node and to tunnel said packetized communication content to a temporary care-of data network address registered on behalf of said mobile wireless node, a method for providing seamless data network telecommunication service to the mobile wireless node during a mobile wireless call handoff procedure resulting in the mobile wireless node being handed off from a first one of the base stations to second one of the base stations, comprising the steps of;

    prior to initiation of said call handoff procedure, controlling said home agent to route said packetized communication content on behalf of said mobile wireless node to a first care-of data network address for delivery to said mobile wireless node via said first base station;

    following initiation of said call handoff procedure, notifying said home agent of said call handoff procedure and a second care-of data network address;

    controlling said home agent to route said packetized communication content on behalf of said mobile wireless node to said second care-of data network address for delivery to said mobile wireless node via said second base station, while continuing to route the same packetized communication content to said first care-of data network address for delivery to said mobile wireless node via said first base station; and

    upon completion of said call handoff procedure, controlling said home agent to terminate the routing of said packetized communication content on behalf of said mobile wireless node to said first care-of data network address.

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