Method and apparatus for handoff of a wireless packet data...

H - Electricity – 04 – W

Patent

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H04W 8/26 (2009.01) H04W 92/02 (2009.01)

Patent

CA 2686598

A novel method and apparatus is disclosed for performing seamless handoff of a mobile station (MS) between Radio Access Networks (RANs) that use different types of wireless interfaces. The described embodiments enable an MS to handoff between different RANs without causing routing ambiguity, and without substantial loss of network data. Upon moving from the coverage area of a first RAN using a first wireless interface to the coverage area of a second RAN using a second wireless interface, an MS determines whether routing ambiguity may result from the change of RAN and, based on the determination, triggers a re--registration of its network address. A foreign agent (FA) within a packet data serving node (PDSN) monitors network address re-registrations are being created for the same MS. Based on this determination, the PDSN terminates redundant R-P network connections resulting from movement of the MS between different RANs.

La présente divulgation décrit une méthode et un dispositif inédits qui permettent d'effectuer le transfert transparent d'une station mobile (MS) entre des réseaux d'accès radio (RAN) qui font appel à différents types d'interfaces sans fil. Les versions décrites permettent à une MS d'effectuer un transfert entre différents RAN, sans causer d'ambiguïté de routage, et sans perte importante de données relatives aux réseaux. En passant de la zone de couverture d'un premier RAN au moyen d'une première interface sans fil, à la zone de couverture d'un second RAN au moyen d'une seconde interface sans fil, une MS détermine si une ambiguïté de routage peut résulter d'un changement de RAN et, en fonction de la détermination effectuée, déclenche un réenregistrement de son adresse réseau. Un agent étranger (FA), au sein d'un noeud de desserte de données de paquets (PDSN) contrôle les réenregistrements d'adresses de réseaux créés pour la même MS. En fonction de cette détermination, le PDSN termine les connexions de réseaux R-P redondantes résultant du mouvement des MS entre différents RAN.

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