SYSTEM AND METHOD FOR DETERMINING WHEN TO EXIT A WIRELESS COMMUNICATION COVERAGE NETWORK

• US 20060264211A1
• Filed: 07/27/2006
• Published: 11/23/2006
• Est. Priority Date: 08/26/2003
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Wireless Corporation (Kyocera Corporation)
• Inventors: Chang, Henry, KALHAN, AMIT
• Granted Patent: US 7,302,271 B2
• Time in Patent Office: Days
• US Class Current: 455/425
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 76/30 Connection release

Abstract

A system and method are described for determining when to exit an existing wireless communication coverage network. The method samples the device geographical position, determines a threshold boundary line, measures the position of each sample point with respect to the threshold boundary line, and, beginning at a predetermined initial value, maintains a running sum in response to measuring position. The existing coverage network is exited when the running sum is greater than or equal to a predetermined terminal value.

Claims

1. A method for determining when a wireless communication device should exit a current coverage area of a plurality of coverage areas of a wireless communication network system, the method comprising the steps of:

determining at least one threshold boundary line between the current coverage area of the wireless communication device and a second coverage area of the plurality of coverage areas;

partitioning the current coverage area into at least one current zone that is adjacent to the at least one threshold boundary line;

assigning a current zone value to the at least one current zone;

partitioning the second overage area into at least one second zone that is adjacent to the at least one threshold boundary line;

assigning a second zone value to the at least one second zone;

periodically determining a physical position of the wireless communication device;

maintaining a running sum based upon the periodic determination of the physical position comprising the steps of;

incrementing the running sum by the current zone value when the wireless communication device is in the at least one current zone; and

decrementing the running sum by the second zone value when the wireless communication device is in the at least one second zone; and

exiting the current coverage area when the running sum is at least equal to a pre-determined terminal value.

2. The method of claim 1 wherein the step of periodically determining the physical location comprises the step of receiving location information from global position system (GPS) of the wireless communication device.

3. The method of claim 1 wherein the step of periodically determining the physical location comprises receiving location information from the wireless communication network system.

4. The method of claim 1 wherein the step of determining at least one threshold boundary line further comprises the step of:

evaluating network conditions of the current coverage area; and

shifting the at least one threshold boundary line based upon the evaluation.

5. The method of claim 1 wherein determining the at least one threshold boundary line comprises:

adapting the threshold boundary line to a first set of dynamic conditions in the current coverage area and to a second set of dynamic conditions in the second coverage area.

6. The method of claim 1 wherein the at least one threshold boundary line is a set distance from a geographical center of the current coverage network.

7. The method of claim 1 wherein the wireless communication network system is Code Division Multiple Access (CDMA).

8. The method of claim 1 wherein the current zone value is assigned based upon an average distance from within the current coverage area to the threshold boundary line.

9. The method of claim 1 further comprising the steps of:

compiling information regarding proximate coverage areas of the plurality of coverage areas that are proximate to the current coverage area; and

wherein the step of determining the at least one threshold boundary line comprises using the compiled information to determine a plurality of threshold boundary lines between the current coverage area and proximate coverage areas.

10. The method of claim 1 wherein the step of exiting the current coverage area further comprises entering the second coverage area and re-configuring the wireless communication device to establish at least one new boundary line to determine when to exit the second coverage area network.

11. A wireless communication device for determining when to exit a current coverage area of a plurality of coverage areas of a wireless communication network, the device comprising:

a processor for determining at least one threshold boundary line between the current coverage area and a second coverage area of the plurality of coverage areas, the processor for initiating an exit from the current coverage area upon receipt of an exit signal;

a locator circuit for periodically outputting a geographical sample position representing a physical location of the wireless communication device;

a comparison circuit connected to the locator circuit, the comparison circuit for partitioning at least a portion of the current coverage area into at least one current zone that is adjacent to the at least one threshold boundary line and for assigning a current zone value to the at least one current zone, the comparison circuit for partitioning at least a portion of the second coverage area into at least one second zone that is adjacent to the at least one threshold boundary line and for assigning a second zone value to the at least one second zone; and

a counting circuit connected to the comparison circuit and the processor, the counting circuit for maintaining a running sum based upon the geographical sample position, the counting circuit incrementing the running sum by the current zone value when the geographical sample position is in the at least one current zone and decrementing the running sum by the second zone value when the geographical sample position is in the at least one second zone, the counting circuit outputting the exit signal to the processor when the running sum reaches a pre-determined exit terminal value.

12. The wireless communication device of claim 11, wherein the processor utilizes threshold line information received from a base station to determine the at least one threshold boundary line.

13. The wireless communication device of claim 11, wherein the counting circuit decrements the running sum by the current zone value when the geographical sample position is in the at least one current zone and increments the running sum by the second zone value when the geographical sample position is in the at least one second zone

14. The wireless communication device of claim 11, wherein the counting circuit comprises:

a subtracting circuit for maintaining a decrement accumulation value of the running sum;

an adding circuit fir maintaining an increment accumulation value of the running sum; and

,

a totalizer connected to the subtracting circuit and the adding circuit, the totalizer for supplying the exit signal.

15. The wireless communication device of claim 11, wherein the totalizer outputs the exit signal when the running sum is greater than or equal to the terminal value, and resets the running sum to an initial value after supplying the exit signal.

16. The wireless communication device of claim 11, further comprising:

a transceiver for receiving device geographical sample positions from a source external to the wireless communication device and for supplying the device geographical sample positions to the locator circuit.

17. The wireless communication device of claim 11, wherein the processor determines the at least one threshold boundary line using a plurality of vectors referenced to a geographical center of the current coverage area.

18. The wireless communication device of claim 11, wherein the processor determines the at least one threshold boundary line through an evaluation of network conditions of the current coverage area.

19. The wireless communication device of claim 11, wherein the processor adapts the threshold boundary line in response to receiving a first set of dynamic conditions in the current coverage area and a second set of dynamic conditions in the second coverage area.

20. The wireless communication device of claim 11, wherein the processor compiles information regarding proximate coverage areas of the plurality of coverage areas that are proximate to the current coverage area, and uses the compiled information to determine a plurality of threshold boundary lines between the current coverage area and the proximate coverage areas.