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Assigning an IP address to a mobile station while roaming

  • US 6,374,108 B1
  • Filed: 11/30/1999
  • Issued: 04/16/2002
  • Est. Priority Date: 11/30/1999
  • Status: Expired due to Term
First Claim
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1. A cellular radio communications system having at least a first and second radio network having different geographical coverage areas, the cellular radio communication system comprising:

  • a non-mobile-IP capable mobile station addressable using IP addresses, the mobile station being adapted to roam between the first and second radio network, the first network comprising a home network of the mobile station and the second network comprising a foreign network of the mobile station;

    a fast controller associated with the first network; and

    a second controller comprising infrastructure equipment associated with die second network, the second controller being adapted upon the mobile station roaming from the first network to the second network;

    (i) to receive a context activation request from the mobile station that the cellular radio communication system assign to the mobile station a static IP address previously assigned to the mobile station by the first controller;

    (ii) in response to the request from the mobile station, to check with the first controller that the static IP address has not been assigned to another mobile station;

    (iii) to assign the static IP address previously assigned to the mobile station by the first controller, to the mobile station for use in the second network, if the static IP address has not been assigned to another mobile station; and

    (iv) to perform mobile IP registration with the first controller on behalf of the mobile station.

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