System and method for wireless call handover from a shared network to a home network

• US 7,155,221 B1
• Filed: 02/26/2004
• Issued: 12/26/2006
• Est. Priority Date: 02/26/2004
• Status: Active Grant

• Current Assignee: Cingular Wireless LLC (AT&T, Inc.)
• Original Assignee: Cingular Wireless II LLC (AT&T, Inc.)
• Inventors: Gazzard, Daryl
• Primary Examiner(s): Feild, Joseph
• Assistant Examiner(s): Afshar, Kamran
• Application Number:
  US10/786,132
• Time in Patent Office: 1,034 Days
• Field of Search: 455/432.1, 455/435.1, 455/435.2, 455433-434, 455436-444, 455/515, 455/525, 370/328, 370/525, 370/331, 370/335, 370/342
• US Class Current: 455/433
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 36/0058 Transmission of hand-off measurement information, e.g. measurement reports
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface

Abstract

A method and system for differential handover of a call into a home mobile network from a partner mobile network is disclosed. An exemplary embodiment of a method for differential call handover includes setting a flag in the partner mobile network which identifies a mobile station, whose communication is being handled by the partner network, as a subscriber to the home network. In an exemplary embodiment, channel information associated with possible handover cells of the home network is retrieved by the partner network after the latter receives a communication from the mobile station indicating a handover condition.

Claims

1. A method for selecting a cell for handover of a continuing communication, wherein the communication is initially routed through a first cell of a partner mobile network, comprising:

establishing a flag for use by a partner mobile network and a home mobile network, the flag indicating that a mobile station belongs to a subscriber to the home mobile network;

storing information including the flag in a database that is in communication with the partner mobile network;

setting a flag with respect to a communication involving the mobile station that is being carried on a partner mobile network as including a mobile station of a subscriber of a home mobile network;

determining that a handover from a first cell in the partner mobile network to a second cell among a plurality of candidate cells, is necessary to maintain communications for the mobile station; and

initiating a handover of the communication from the first cell to the second cell if the second cell belongs to the home mobile network, wherein whether the second cell belongs to the home mobile network is determined, at least in part, by evaluating whether the flag is set.

2. The method of claim 1, wherein, prior to the handover, radio parameters associated with the second cell belonging to the home mobile network are received by the partner mobile network.

3. The method of claim 1, wherein each of the partner and the home mobile networks operates its own mobile switching center.

4. The method of claim 1, wherein, prior to the communication handover, the partner mobile network receives information including control channel and system parameters associated with the home mobile network.

5. The method of claim 4, further comprising;

sending a handover request from the base station controller of the partner mobile network, the request including parameters associated with the second cell;

receiving resource information from the home network at the base station controller of the partner network, the resource information including information associated with the second cell; and

sending information from the partner network at the mobile station of the subscriber to the home network, including an appropriate communications channel associated with the second cell.

6. The method of claim 4, wherein the control channel and system parameters associated with the home network are stored in a database accessible to the mobile switching center of the partner network.

7. The method of claim 4, wherein the communication is a voice transmission.

8. The method of claim 4, further comprising:

receiving a communication at a base station controller of the partner mobile network that controls the first cell, including at least one home mobile network channel.

9. The method of claim 8, further comprising:

monitoring measurement reports sent by the mobile station belonging to the subscriber of the home mobile network, including a signal strength of the second cell controlling the at least one home mobile network channel, at the base station controller of the partner mobile network that controls the first cell; and

excluding cells not reporting over the at least one home mobile network channel from further measurements.

10. The method of claim 4, wherein the communication is a GPRS message.

11. The method of claim 10, further comprising:

removing cells not belonging to the home network from a measurement list associated with the mobile station of the subscriber to the home network; and

sending a measurement list to the mobile station of the subscriber to the home network, wherein the measurement list includes the second cell.

12. A method for increasing revenues of a home mobile communications network, comprising:

establishing a flag for use by a partner mobile network and a home mobile network, the flag indicating that a mobile station belongs to a subscriber to the home mobile network;

storing information including the flag in a database that is in communication with the partner mobile network;

setting the flag when the partner mobile network handles a communication to a mobile station belonging to a subscriber to the home mobile network; and

handing over the communication back to the home mobile network whenever the mobile station enters a region in which the home network operates, the handover being effected due to the flag being set,

whereby revenues are increased to the home mobile network by handling the communication through the home mobile network whenever the mobile station is in a region in which the home mobile network operates.