Method for selecting a wireless communication service provider in a multi-service provider environment

• US 7,356,338 B2
• Filed: 05/25/2004
• Issued: 04/08/2008
• Est. Priority Date: 12/12/1995
• Status: Expired due to Fees

• Current Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Original Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Inventors: Raffel, Michael Allen, Lawrence, Christopher Gregory, Daly, John J., Bamburak, Michael D., Prise, Michael Edward
• Primary Examiner(s): Urban; Edward F.
• Assistant Examiner(s): CHOW, CHARLES CHIANG
• Application Number:
  US10/852,215
• Publication Number:
  US 20040214573A1
• Time in Patent Office: 1,414 Days
• Field of Search: 455/434, 455/432.1, 455/433, 455/435.1, 455/435.2, 455/436, 455/437, 455/438, 455/439, 455/440, 455/452.1, 455/454, 455/403, 455/418, 455/422.1, 455/424, 455/425, 455/456.5, 455/455, 455/456.6, 455/550.1, 455/575.1, 455/448, 455/561, 455/464, 455/509, 455/524, 455/62, 455/552.1, 455/134, 455/179.1, 455/185.1, 455/168.1, 455/67.13, 455/456.3, 455/525, 340/22, 340/37, 340/825.77, 340/311.1, 340/825.44, 340/825.52, 370/238, 370/351, 370/394, 370/328, 370/352, 370/235, 370/389, 370/392, 370/329, 370/331, 379/61, 379/62, 379/59, 379/60
• US Class Current: 455/434
• CPC Class Codes: H04B 7/2621 using frequency division multiple access [FDMA] H04B7/2615 takes precedence
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• 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 communication device locates a wireless service provider in a multi-service provider environment using a frequency band search schedule. The frequency band search schedule has a first or home band and a several other frequency bands in a predetermined ordered. The order of the frequency bands may be programmed by the user or by a home service provider over the air. The communication device searches for an acceptable service provider by examining the home band and then the other bands listed in the frequency band search schedule. The bands are examined in the order specified by the frequency band search schedule. An acceptable service provider is identified by comparing the identify of a service provider specified by an identifier received from a band being examined with a list of acceptable service providers.

Claims

1. A wireless communication device that locates a wireless service provider in a multi-service provider environment, comprising:

a memory that stores a frequency search schedule having a plurality of frequencies in a prioritized order and is configured to store an identifier of a last service provider and a list of preferred service providers; and

a processor that after power up of the wireless communications device following a power down thereof compares a last service provider to the list of preferred service providers to determine whether the last service provider was a preferred service provider, the last service provider being a service provider last used before the power down of the wireless communications device, accepts information, modifies the prioritized order of the frequency search schedule based on the information, and examines frequencies in the modified order in the frequency search schedule, until a frequency having a preferred service provider is located, if a last service provider was not a preferred service provider, wherein the processor is configured to remove from the frequency search schedule frequency bands corresponding to a last service provider if the last service provider was a non-preferred service provider.

2. The wireless communication device of claim 1, wherein the information accepted by the processor comprises information input by at least one of a device distributor and a device user.

3. The wireless communication device of claim 1, wherein the information accepted by the processor comprises information transmitted over-the-air.

4. The wireless communication device of claim 1, wherein a highest priority frequency in the frequency search schedule is a home frequency of the communication device.

5. The wireless communication device of claim 1, wherein the frequency search schedule is in an order optimized to reduce a time necessary to locate a preferred service provider.

6. The wireless communication device of claim 1, wherein the processor periodically examines frequencies in the modified frequency search schedule until a frequency having a preferred service provider is located, if a determination is made that a present service provider is not a preferred service provider.

7. The wireless communication device of claim 1, wherein the processor locates a service provider by dividing the frequencies into frequency bands, detecting a signal frequency with a largest amplitude in a frequency band, and decoding an identifying signal transmitted at the detected frequency.

8. A method by which a communication device locates a wireless service provider in a multi-service provider environment, the method comprising after power up of the wireless communications device following a power down thereof:

storing a frequency search schedule having a plurality of frequencies in a prioritized order;

storing an identifier of a last service provider and a list of preferred service providers;

comparing the identifier of the last service provider to the list of preferred service providers to determine whether the last service provider was not a preferred service provider, wherein the last service provider is a service provider last used before the power down of the communications device;

accepting information;

modifying the prioritized order of the frequency search schedule based on the accepted information;

removing from the frequency search schedule frequency bands corresponding to the last service provider; and

examining frequencies in the modified order until a frequency having a preferred service provider is located.

9. The method of claim 8, wherein accepting information further comprises accepting information input by at least one of a device distributor and a device user.

10. The method of claim 8, wherein accepting information further comprises accepting information transmitted over-the-air.

11. The method of claim 8, wherein examining frequencies further comprises:

a) dividing the frequencies in the frequency search schedule into bands;

b) selecting a first frequency band;

c) detecting a signal frequency with a largest amplitude in the first frequency band;

d) determining if an identifying signal transmitted at the detected signal frequency can be decoded; and

e) if the identifying signal cannot be decoded, selecting a next frequency band.

12. The method of claim 11, further comprising;

repeating steps a) through e) until it is determined that the identifying signal can be decoded; and

decoding the identifying signal at the detected signal frequency, to identify a preferred service provider.

13. The method of claim 8, further comprising periodically examining frequencies in the search schedule until a frequency having a preferred service provider is located, if a present service provider is not a preferred service provider.

14. The method of claim 8, wherein the frequency search schedule is in an order optimized to reduce a time necessary to locate a preferred service provider.

15. A recording medium that stores a executable control program for use by a wireless communication device after a power up of the wireless communications device following a power down thereof, the control program including instructions for:

storing a frequency search schedule having a plurality of frequencies in a prioritized order;

storing an identifier of a last service provider and a list of preferred service providers;

comparing the identifier of the last service provider to the list of preferred service providers to determine whether the last service provider was not a preferred service provider, wherein the last service provider is a service provider last used before the power down of the wireless communications device;

accepting information;

modifying the prioritized order of the frequency search schedule based on the accepted information;

removing from the frequency search schedule frequency bands corresponding to the last service provider; and

examining frequencies in the modified order until a frequency having a preferred service provider is located.

16. The recording medium of claim 15, the control program further including instructions for modifying the stored frequency search schedule based on information input by a device distributor, device user, or transmitted over-the-air.

17. The recording medium of claim 15, the control program further including instructions for setting a flag if a present service provider is not a preferred service provider.

18. The recording medium of claim 17, the control program further including instructions for periodically examining frequencies in the search schedule until a frequency having a preferred service provider is located, if the flag has been set.

19. The recording medium of claim 15, the control program further including instructions for:

a) dividing the frequencies in the frequency search schedule into bands;

b) selecting a first frequency band;

c) detecting the signal frequency with the largest amplitude in the first frequency band;

d) determining if an identifying signal transmitted at the detected signal frequency can be decoded; and

e) if an identifying signal cannot be decoded, selecting a next frequency band.

20. The recording medium of claim 15, wherein the frequency search schedule is in an order optimized to reduce a time necessary to locate a preferred service provider.