Delayed ACK in dual-mode call handover

• US 20090156217A1
• Filed: 12/12/2007
• Published: 06/18/2009
• Est. Priority Date: 12/12/2007
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Aruba Networks Incorporated (Hewlett-Packard Enterprise Company)
• Inventors: Bajpai, Rajneesh
• Granted Patent: US 8,744,451 B2
• Time in Patent Office: Days
• US Class Current: 455/439
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• 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

Handover of a call to a dual-mode phone from cellular to Wi-Fi. When handing over a call mediated by a mobility controller to a dual-mode phone and switching the call from a cellular to a Wi-Fi call, the mobility controller initates a Wi-Fi connection to the dual mode phone. When the Wi-Fi connection is established, and with the cellular connection through the mobility controller still in place, the mobility controller starts a timer with a predetermined value and the dual-mode phone initiates release of the cellular connection. When the timer expires, the mobility controller switches the call from the cellular connection to the Wi-Fi connection.

Claims

1. A method of transferring a call from the cellular side to the Wi-Fi side of a dual-mode phone, the call mediated by a controller, comprising:

receiving, in the controller, an indication that the dual-mode phone is within Wi-Fi range,

the controller making a Wi-Fi connection to the dual-mode phone, the dual-mode phone having a cellular connection mediated by the controller,

the controller starting a timer for a predetermined time when the Wi-Fi connection to the dual-mode phone is made, and

connecting the call to the Wi-Fi connection when the timer expires.

2. The method of claim 1 where the step of making a Wi-Fi connection further comprises:

the controller initiating the connection through a Wi-Fi network, and

the controller receiving a notification the Wi-Fi connection has completed.

3. The method of claim 1 where the step of connecting the call to the Wi-Fi connection further comprises:

changing NAT bindings of the RTP data streams associated with the call and the Wi-Fi connection.

4. The method of claim 1 where the call is directed to the controller by a SIP PBX.

5. The method of claim 1 where the dual-mode phone initiates the release procedure for the cellular connection when the Wi-Fi connection from the controller is made.