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Method and software for controlling seamless vertical roaming

  • US 20060159048A1
  • Filed: 01/03/2006
  • Published: 07/20/2006
  • Est. Priority Date: 07/02/2003
  • Status: Abandoned Application
First Claim
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1. A method of controlling seamless vertical roaming in a personal information device equipped with a wireless modem and a Wireless Local Area Network (WLAN) device, the method comprising:

  • being assigned an Internet Protocol (IP) address by a Foreign Agent (FA) within an accessible WLAN using a Dynamic Host Configuration Protocol (DHCP) client, wherein the IP address is stored on a filter set on a physical layer and registered on a Domain Name Server (DNS) of the WLAN, which is currently being accessed, by the FA;

    transmitting a Mobile IP (MIP) request message to the FA;

    receiving a MIP advertisement message from the FA;

    transmitting a MIP registration request message to the FA, wherein the FA transmits the MIP registration request message to a Home Agent (HA) and receives a first MIP address from the HA;

    receiving the first MIP address from the FA, wherein the first MIP address is stored in the filter and the FA registers the first MIP address in the HA;

    determining whether the personal information device has left a WLAN area (hot spot);

    if, as a result of the determination, the personal information device has left the WLAN area, terminating an operation of the WLAN device and connecting a Point-to-Point Protocol (PPP) session with a Packet Data Serving Node (PDSN) within the WLAN using dial-up networking of the wireless modem at the same time; and

    receiving a second MIP address from the PDSN, wherein the second MIP address is assigned by the HA to correspond to the first MIP address and stored in the filter, and the PDSN registers the second MIP address in the HA.

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