3G/Gsm and Wlan Integration of Telephony
1 Assignment
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Accused Products
Abstract
A Dual mode mobile terminal (MT2) comprising a WLAN interface (WLAN_NIC) and a cellular radio interface (GSM_NIC) has been described wherein when receiving a Page Request (6) 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 (7) 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 (8) 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 (9) from a dual mode terminal via a WLAN AP, is establishing a connection against a serving mobile switching centre (S_MSC/VLR) (10,10a,10b), is performing a call initiation procedure (12-15), a assign traffic channel procedure (16-20) and a call confirmation and call accepted procedure (22-27) between the dual mode terminal (MT2) and the serving switching mode centre (S_MSC/VLR), is initiating duplex GSM/IP translation (29) and is routing the cellular call between the AP and the serving mobile switching centre (S_MSC).
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Citations
22 Claims
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1-11. -11. (canceled)
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12. A method of operating a dual mode mobile terminal comprising a wireless local area network interface and a cellular radio interface, comprising the steps of:
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camping on the cellular radio interface when idle;
when receiving a Page Request message over the cellular radio interface indicating an incoming voice call over the cellular radio interface, performing a determination as to whether wireless local area network coverage is possible from an access point providing wireless local area network telephony calls and, if so;
responding, by issuing a wireless local area network call message to the wireless local area network access point thus determined over the wireless local area network interface to an interworking node;
subsequently engaging in a call initiation procedure, an assign traffic channel procedure and a call confirmation and call accepted procedure with the interworking node; and
,processing the incoming voice call over the wireless local area network interface towards another party, wherein when the call is ended, the dual mode mobile terminal going back to camp on the cellular channel. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A dual mode mobile terminal, comprising:
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a wireless local area network interface and a cellular radio interface;
a software application including apparatus control and call selection, SIP/H323-logic and signal processing, voice over IP coding/decoding, GSM-logic and signal processing and cellular voice coding/decoding, and a camp logic function for controlling whether the dual mode mobile terminal shall operate over the cellular or the wireless local area network interfaces;
wherein said dual mode terminal is operative to;
camp on the cellular radio interface when idle;
when receiving a Page Request message over the cellular radio interface indicating an incoming voice call over the cellular radio interface, perform a determination as to whether wireless local area network coverage is possible from an access point providing wireless local area network telephony calls and, if so;
responding by issuing a wireless local area network call message to the wireless local area network access point thus determined over the wireless local area network interface to an interworking node;
subsequently engaging in a call initiation procedure, an assign traffic channel procedure and a call confirmation and call accepted procedure with the interworking node; and
,processing the incoming voice call over the wireless local area network interface towards another party, wherein the dual mode mobile terminal goes back to camp on the cellular channel, when the call is ended. - View Dependent Claims (20, 21, 22)
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Specification