Method and apparatus in a wireless communication system for...

Details Method and apparatus in a wireless communication system for... Method and apparatus in a wireless communication system for...

2006-12-26

2006-12-26

Gelin, Jean (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S435100, C455S440000, C455S422100, C370S902000, C370S466000

Reexamination Certificate

active

07155225

ABSTRACT:
A dual-band wireless subscriber unit (SU) (112) having an enterprise address of E1and a cellular address of C1, corresponding method (200), software program (310–320), and WLAN (104) determines (202) that the SU is about to leave a wireless local area network (WLAN) (104). In response, when the SU is involved in a call on E1, the SU sends (212, 208) to the WLAN a SIP message, for example a Refer message with a “Refer To” field of C1if an ongoing call or a SIP Redirect message with a contact address of C1if a new call is attempting to begin on E1. In response to receiving either message, the WLAN seamlessly transfers (210, 214) the call to C1.

REFERENCES:
patent: 7039028 (2006-05-01), Chen et al.
patent: 2004/0030791 (2004-02-01), Dorenbosch et al.
patent: 2004/0264410 (2004-12-01), Sagi et al.
patent: 2005/0047435 (2005-03-01), Segal et al.
patent: 2005/0048972 (2005-03-01), Dorenbosch et al.

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