Method and system using a conference bridge for handoff of a...

H - Electricity – 04 – W

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H04W 36/14 (2009.01) H04W 4/16 (2009.01)

Patent

CA 2608660

A multi-mode mobile station includes a first interface for wireless communication with a wireless local area network (WLAN) and a second interface for wireless communication with a wireless wide area network (WWAN). The multi- mode mobile station is associated with a particular conference bridge, through which all calls to and from the multi-mode mobile station are routed. For example, when a call involving the multi-mode mobile is established via the WLAN, the call includes a WLAN call leg that extends from the conference bridge to the multi-mode mobile station via the WLAN. To effect a handoff during the call, a WWAN call leg is established between the multi-mode mobile station and the conference bridge via the WWAN. The conference bridge bridges the WLAN and WWAN call legs. To complete the handoff, the multi-mode mobile station drops the WLAN call leg and continues the call using the WWAN call leg.

La présente invention se rapporte à une station mobile multimode, qui comprend une première interface permettant une communication sans fil avec un réseau local sans fil (WLAN), et une seconde interface permettant une communication sans fil avec un réseau étendu sans fil (WWAN). La station mobile multimode selon l'invention est associée à un pont de conférence donné, à travers lequel sont acheminés tous les appels transmis depuis la station mobile multimode et vers cette dernière. Par exemple, lorsqu'un appel faisant intervenir ladite station mobile multimode est établi par l'intermédiaire du WLAN, ledit appel contient un segment d'appel WLAN qui s'étend du pont de conférence à la station mobile multimode par l'intermédiaire du WLAN. Afin de réaliser un transfert pendant l'appel, un segment d'appel WWAN est établi entre la station mobile multimode et le pont de conférence par l'intermédiaire du WWAN. Le pont de conférence relie les segments d'appel WLAN et WWAN. Afin d'achever le transfert, la station mobile multimode abandonne le segment d'appel WLAN et poursuit l'appel avec le segment d'appel WWAN.

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