METHOD AND APPARATUS IN A WIRELESS COMMUNICATION SYSTEM FOR FACILITATING A HANDOFF

Title:

METHOD AND APPARATUS IN A WIRELESS COMMUNICATION SYSTEM FOR FACILITATING A HANDOFF

Document Type and Number:

WIPO Patent Application WO2005025108

Kind Code:

A3

Abstract:

A dual-band wireless subscriber unit (SU) (112) having an enterprise address of E1 and 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 C1 if an ongoing call or a SIP Redirect message with a contact address of C1 if 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.

Inventors:

SEGAL NIRANJAN N (US)
BELKIN ANATOLY S (US)
HIRSBRUNNER ALEX P (US)
IDNANI AJAYKUMAR (US)
PIERCE JENNIFER (US)

Application Number:

PCT/US2004/022091

Publication Date:

June 02, 2005

Filing Date:

July 09, 2004

Export Citation:

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Assignee:

MOTOROLA INC (US)
SEGAL NIRANJAN N (US)
BELKIN ANATOLY S (US)
HIRSBRUNNER ALEX P (US)
IDNANI AJAYKUMAR (US)
PIERCE JENNIFER (US)

International Classes:

H04L12/28; H04L12/56; H04W36/14; H04W8/26; H04W36/18; H04W76/04; H04W84/12; H04W88/00; H04W88/06; (IPC1-7): H04Q7/00

Foreign References:

US20040264410A1	2004-12-30
US20050048972A1	2005-03-03

Other References: