The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 2011
Filed:
Sep. 17, 2004
Gunnar Rydnell, V Frölunda, SE;
Hans Rönneke, Kungsbacka, SE;
Stefan Rommer, Göteborg, SE;
Jan Lindskog, Pixbo, SE;
Gunnar Rydnell, V Frölunda, SE;
Hans Rönneke, Kungsbacka, SE;
Stefan Rommer, Göteborg, SE;
Jan Lindskog, Pixbo, SE;
Telefonaktiebolaget L M Ericcson (PUBL), Stockholm, SE;
Abstract
A Dual mode mobile terminal (MT) comprising a WLAN interface (WLAN_NIC) and a cellular radio interface (GSM_NIC) has been described wherein when receiving a Page Request () message over the cellular radio interface (GSM_NIC), indicating an incoming voice call over the cellular radio interface, or upon receiving an indication from the user of the dual mode terminal to perform an outgoing voice call, performing a determination () as to whether a WLAN coverage is possible from an AP providing WLAN telephony calls, and if so responding, by issuing a WLAN call message () to a WLAN AP over the WLAN interface to an interworking node (IWFN). There is moreover provided an Interworking node (IWFN) comprising a cellular control unit (CTRL_SIP), a cellular unit (GSM_U), a voice over IP unit (VO_IP) and a router (R), which upon receiving a WLAN call () from a dual mode terminal via a WLAN AP, is establishing a connection against a serving mobile switching centre (S_MSC/VLR) (), is performing a call initiation procedure (-), a assign traffic channel procedure (-) and a call confirmation and call accepted procedure (-) between the dual mode terminal (MT) and the serving switching mode centre (S_MSC/VLR), is initiating duplex GSM/IP translation () and is routing the cellular call between the AP and the serving mobile switching centre (S_MSC).