MULTI-MODE WWAN / WLAN MOBILE STATION AND METHOD FOR REGISTERING SAID MOBILE STATION IN A WWAN THROUGH A WLAN

摘要

A mobile station has multiple communication modules for multiple wireless communication modes (e.g. SIP, H.323 and cellular). In a first wireless communication mode (i.e. cellular mode), the mobile station communicates with a wireless wide area network (WWAN) and is identified by a first, mobile directory number (e.g. its mobile telephone number, IMSI, etc). In a second wireless communication mode (i.e. SIP mode), the mobile station communicates with a wireless local area network (WLAN) and is still identified by the first, mobile directory number. In a third wireless communication mode (i.e. H.323 mode), the mobile station communicates with the wireless local area network but is identified by a second, local directory number. A method is also provided to register a multi-mode mobile station in a WWAN when the mobile station is currently associated to a WLAN (i.e. the mobile station) is registered in the WWAN through the WLAN).