Method of Seamless Roaming Between Wireless Local Area Networks and Cellular Carrier Networks

• US 20120028646A1
• Filed: 10/06/2011
• Published: 02/02/2012
• Est. Priority Date: 10/18/2002
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Kraasten Bros Fund BV LLC (Intellectual Ventures LLC)
• Inventors: Ibe, Oliver C., Zeng, Jianyu
• Granted Patent: US 8,509,789 B2
• Time in Patent Office: Days
• US Class Current: 455/445
• CPC Class Codes: H04W 36/0022 for transferring data sessions between adjacent core network technologies
• CPC Class Codes: H04W 36/00226 wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 36/1446 wherein at least one of the networks is unlicensed
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A scheme that enables seamless roaming between the WLAN and the cellular carrier network by enabling a user that originates a call in the WLAN and happens to go outside the range of the WLAN to automatically switch over to the cellular carrier network without losing connection with the other party. This solution assumes that the mobile device has the capability to operate in at least two modes that include the WLAN mode and one of the cellular carrier modes, such as the GSM, IS-95 CDMA, IS-136 TDMA, and iDEN.

Claims

1-9. -9. (canceled)

10. A method, comprising:

registering a mobile terminal on a cellular carrier network,

receiving a call from the cellular carrier network via a fixed radio terminal; and

routing the received call to the mobile terminal over a wireless local area network at least by calling a telephone number of the mobile terminal.