Method for inter-IP-domain roaming across wireless networks

A. Field of the Invention A method involves in integrating the communication mechanisms of IAPP and mobile IP is provided for allowing a mobile station to roam among various APs in different IP subnets. When a mobile station roams to a new IP subnet, it will issue a reassociation request to an Acces...

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Bibliographic Details
Main Authors Chiou, Jiann-Ching, Leu, Yuh-Rong, You, Ming-Young
Format Patent
LanguageEnglish
Published 29.10.2002
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Summary:A. Field of the Invention A method involves in integrating the communication mechanisms of IAPP and mobile IP is provided for allowing a mobile station to roam among various APs in different IP subnets. When a mobile station roams to a new IP subnet, it will issue a reassociation request to an Access Point A in the new IP subnet. In response to the reassociation request, the Access Point A will need the IP address of the previous Access Point B in the previous IP subnet to send the handoff request to the Access Point B. So, the Access Point A can find the IP address of the Access Point B via the communication mechanism of mobile IP of IP layer and then send the handoff request frame to the Access Point B. In turn, upon receiving the handoff request frame, the Access Point B deletes the record of the mobile station in the association table and then sends the handoff response frame back to the Access Point A via the communication mechanism of mobile IR. The unicast handoff response frame will be forwarded to the Access Point A. Consequently, the Access Point A can complete the handoff procedure.