Method and apparatus for system selection

• US 20040235475A1
• Filed: 05/23/2003
• Published: 11/25/2004
• Est. Priority Date: 05/23/2003
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Ishii, Atsushi
• Granted Patent: US 7,139,587 B2
• Time in Patent Office: Days
• US Class Current: 455/435.3
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• 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

In a wireless communication device which is transportable between plural geographic region, wherein each geographic region has preferred and non-preferred communication systems for the wireless communication device, a method of selecting an appropriate communication system, including providing the wireless communication device with a non-PRL system table for storing acquisition parameters, including a communication system identification, a band class designation for a band class, a channel designation for a channel in the band class, and geographic region identification; making entries in the non-PRL system table when the wireless communication device acquire an appropriate channel in a geographic region; searching the non-PRL system table when the wireless communication device next changes geographic regions; and selecting a communication system based on the acquisition parameters in the non-PRL system table as a result of the searching.

Claims

1. In a wireless communication device which is transportable between plural geographic region, wherein each geographic region has preferred and non-preferred communication systems for the wireless communication device, a method of selecting an appropriate communication system, comprising:

providing the wireless communication device with a non-PRL system table for storing acquisition parameters, including a communication system identification, a band class designation for a band class, a channel designation for a channel in the band class, and geographic region identification;

making entries in the non-PRL system table when the wireless communication device acquires an appropriate channel in a geographic region;

searching the non-PRL system table when the wireless communication device next changes geographic regions; and

selecting a communication system based on the acquisition parameters in the non-PRL system table as a result of said searching.

2. The method of claim 1 wherein the wireless communication device is a CDMA device.

3. The method of claim 1 wherein the band classes include cellular and PCS.

4. A communication system selection apparatus for selecting an appropriate communication system for a wireless communication device which is transportable between plural geographic region, wherein each geographic region has preferred and non-preferred communication systems for the wireless communication device, comprising:

a non-PRL system table for storing acquisition parameters, including a communication system identification, a band class designation for a band class, a channel designation for a channel in the band class, and geographic region identification;

a non-volatile memory for storing said non-PRL system table, including entries in the non-PRL system table which are made when the wireless communication device acquires an appropriate channel in a geographic region;

a search mechanism for interrogating said non-PRL system table when the wireless communication device next changes geographic regions; and

a selection mechanism for selecting a communication system based on the acquisition parameters in said non-PRL system table as a result of the interrogation.

5. The apparatus of claim 4 wherein the wireless communication device is a CDMA device.

6. The apparatus of claim 4 which operates in the cellular and PCS bands.