Mobile communication device initiated hand-off based on wireless base station priority

• US 8,121,090 B1
• Filed: 07/29/2008
• Issued: 02/21/2012
• Est. Priority Date: 07/29/2008
• Status: Active Grant

• Current Assignee: Clearwire Ip Holdings LLC (Deutsche Telekom AG)
• Original Assignee: Clearwire Ip Holdings LLC (Deutsche Telekom AG)
• Inventors: Dinan, Esmail Hejazi, Jung, Jong-hak, Tiwari, Swati, Pawar, Hemanth Balaji, Sitaram, Krishna D.
• Primary Examiner(s): Jung, Min
• Application Number:
  US12/181,924
• Time in Patent Office: 1,302 Days
• Field of Search: None
• US Class Current: 370/331
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 36/36 by user or terminal equipment

Abstract

A mobile communication device wirelessly transfers user communications to a first wireless base station. The mobile communication device identifies a second wireless base station that has sufficient performance characteristics for wireless communication with the mobile communication device and that has a higher communication priority than the first wireless base station. In response, the mobile communication device initiates a hand-off from the first wireless base station to the second wireless base station. In response to the hand-off, the mobile communication device stops the wireless transfer of the user communications to the first wireless base station and wirelessly transfers additional user communications to the second wireless base station.

Claims

1. A method of operating a mobile communication device comprising:

wirelessly transferring user communications to a first wireless base station;

identifying a second wireless base station that has sufficient performance characteristics for wireless communication with the mobile communication device and that has a higher communication priority than the first wireless base station, and in response, initiating a hand-off from the first wireless base station to the second wireless base station; and

in response to the hand-off, stopping the wireless transfer of the user communications to the first wireless base station and wirelessly transferring additional user communications to the second wireless base station,

wherein identifying the second wireless base station having the higher communication priority comprises wirelessly receiving a base station list and processing the base station list to determine that the second wireless base station has the higher communication priority than the first wireless base station, and

the base station list indicates a plurality of prioritized base station groups, wherein the first wireless base station is in a first one of the prioritized base station groups, wherein the second wireless base station is in a second one of the prioritized base station groups, and wherein the second one of the prioritized base station groups has the higher communication priority than the first one of the prioritized base station groups.

2. The method of claim 1 wherein the first wireless base station serves a first geographic area and the second wireless base station serves a second geographic area that is contained within the first geographic area.

3. The method of claim 1 wherein identifying the second wireless base station having the sufficient performance characteristics comprises, in response to determining that that the second wireless base station has the higher communication priority than the first wireless base station, wirelessly receiving a signal from the second wireless base station, obtaining a noise indicator for the second wireless base station based on the received signal, and comparing the noise indicator to a noise threshold.

4. The method of claim 1 wherein identifying the second wireless base station having the sufficient performance characteristics comprises, in response to determining that that the second wireless base station has the higher communication priority than the first wireless base station, wirelessly receiving a signal from the second wireless base station, obtaining a signal strength indicator for the second wireless base station based on the received signal, and comparing the signal strength indicator to a signal strength threshold.

5. The method of claim 1 wherein initiating the hand-off comprises wirelessly transferring a hand-off request to at least one of the first wireless base station and the second wireless base station.

6. The method of claim 1 wherein the user communications and the additional user communications comprise Internet communications.

7. A method of operating a mobile communication device comprising:

wirelessly transferring user communications to a first wireless base station;

identifying a second wireless base station that has sufficient performance characteristics for wireless communication with the mobile communication device and that has a higher communication priority than the first wireless base station, and in response, initiating a hand-off from the first wireless base station to the second wireless base station; and

in response to the hand-off, stopping the wireless transfer of the user communications to the first wireless base station and wirelessly transferring additional user communications to the second wireless base station,

wherein identifying the second wireless base station having the higher communication priority and having the sufficient performance characteristics comprises;

wirelessly receiving a prioritized base station list that includes a first base station group including the first wireless base station and that includes a second base station group including the second wireless base station, wherein the second base station group has the higher communication priority than the first base station group, and selecting the second base station group based on the higher communication priority; and

wirelessly receiving signals from the second base station group, obtaining at least one of noise indicators and signal strength indicators based on the received signals, and selecting the second wireless base station from the second prioritized base station group based on the at least one of noise indicators and signal strength indicators.

8. A mobile communication device comprising:

a wireless communication interface configured to wirelessly transfer user communications to a first wireless base station and to wirelessly transfer additional user communications a second wireless base station; and

a processing system configured to identify the second wireless base station as having sufficient performance characteristics for wireless communication with the mobile communication device and as having a higher communication priority than the first wireless base station, and in response, to initiate a hand-off from the first wireless base station to the second wireless base station,

wherein the processing system is further configured to direct the communication interface to stop the wireless transfer of the user communications to the first wireless base station and to start the wireless transfer of the additional user communications to the second wireless base station in response to the hand-off,

the wireless communication interface is further configured to wirelessly receive a base station list, and the processing system is further configured to process the base station list to determine that the second wireless base station has the higher communication priority than the first wireless base station, and

the base station list indicates a plurality of prioritized base station groups, wherein the first wireless base station is in a first one of the prioritized base station groups, wherein the second wireless base station is in a second one of the prioritized base station groups, and wherein the second one of the prioritized base station groups has the higher communication priority than the first one of the prioritized base station groups.

9. The mobile communication device of claim 8 wherein the first wireless base station serves a first geographic area and the second wireless base station serves a second geographic area that is contained within the first geographic area.

10. The mobile communication device of claim 8 wherein:

the wireless communication interface is configured to wirelessly receive a signal from the second wireless base station and obtain a noise indicator for the second wireless base station based on the received signal;

the processing system is configured to direct the wireless communication interface to receive the signal and obtain the noise indicator, and wherein the processing system is configured to compare the noise indicator to a noise threshold.

11. The mobile communication device of claim 8 wherein:

the wireless communication interface is configured to wirelessly receive a signal from the second wireless base station and obtain a signal strength indicator for the second wireless base station based on the received signal;

the processing system is configured to direct the wireless communication interface to receive the signal and obtain the signal strength indicator, and wherein the processing system is configured to compare the signal strength indicator to a signal strength threshold.

12. The mobile communication device of claim 8 wherein initiating the hand-off comprises wirelessly transferring a hand-off request to at least one of the first wireless base station and the second wireless base station.

13. The mobile communication device of claim 8 wherein the user communications and the additional user communications comprise Internet communications.

14. A mobile communication device comprising:

a wireless communication interface configured to wirelessly transfer user communications to a first wireless base station and to wirelessly transfer additional user communications a second wireless base station; and

a processing system configured to identify the second wireless base station as having sufficient performance characteristics for wireless communication with the mobile communication device and as having a higher communication priority than the first wireless base station, and in response, to initiate a hand-off from the first wireless base station to the second wireless base station,

wherein the processing system is further configured to direct the communication interface to stop the wireless transfer of the user communications to the first wireless base station and to start the wireless transfer of the additional user communications to the second wireless base station in response to the hand-off,

the wireless communication interface is further configured to wirelessly receive a prioritized base station list that includes a first base station group including the first wireless base station and that includes a second base station group including the second wireless base station, wherein the second base station group has the higher communication priority than the first base station group,

the processing system is further configured to select the second base station group based on the higher communication priority and responsively direct the communication interface to wirelessly receive signals from the second base station group and obtain at least one of noise indicators and signal strength indicators based on the received signals,

the communication interface is further configured to wirelessly receive the signals from the second base station group and obtain the at least one of the noise indicators and the signal strength indicators based on the received signals, and

the processing system is further configured to select the second wireless base station from the second prioritized base station group based on the at least one of the noise indicators and the signal strength indicators.