SYSTEM SEARCH METHOD AND MOBILE TERMINAL PERFORMING THE SAME

• US 20090017818A1
• Filed: 06/20/2008
• Published: 01/15/2009
• Est. Priority Date: 07/12/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: SEO, Dong Wan
• Granted Patent: US 9,237,510 B2
• Time in Patent Office: Days
• US Class Current: 455/434
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/0258 controlling an operation mode according to history or models of usage information, e.g. activity schedule or time of day
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A mobile terminal and system search method for the same are provided. The present invention enables a rapid system search with minimized battery consumption after a system loss. The system search method, using a search parameter specifying a first search time S₀ and search periods (D_o+S₁) of a wait time D_o and search time S₁, includes performing, when the mobile terminal experiences a system loss, an initial system search to search for a system to use for the first search time S₀ and increasing, when a system to use is found during the first search time S₀, the first search time S₀ to reset the search parameter.

Claims

1. A system search method for a mobile terminal according to a search parameter specifying a first search time S₀ and search periods (D_o+S₁) of a wait time D_o and search time S₁, the system search method comprising:

performing, when the mobile terminal experiences a system loss, an initial system search for the first search time S₀;

increasing, when a system is found during the first search time S₀, the first search time S_o; and

resetting the search parameter using the first search time S₀.

2. The system search method of claim 1, wherein the increasing of the first search time S₀ comprises incrementing the first search time S₀ by a preset duration S_c to an extent not longer than a maximum search time S_max.

3. The system search method of claim 2, further comprising decreasing the wait time D_o.

4. The system search method of claim 3, wherein the decreasing of the wait time D₀ comprises decrementing the wait time D_o by a preset duration D_c to an extent not shorter than a minimum wait time D_min.

5. The system search method of claim 4, further comprising decreasing, when a system is not found during the first search time S_o, the first search time S₀.

6. The system search method of claim 5, wherein the decreasing of the first search time S₀ comprises decreasing the first search time S₀ to rapidly converge to a minimum search time S_min.

7. The system search method of claim 6, wherein the decreasing of the first search time S₀ resets, when a system is found during a k+1^th search time, the first search time S₀ to max {S₀−

α

·

kⁿ·

S_c, S_min}, wherein k comprises a natural number, α

comprises a constant and n comprises a natural number.

8. The system search method of claim 7, further comprising increasing the wait time D_o.

9. The system search method of claim 8, wherein the increasing of the wait time D_o comprises increasing D_o to rapidly converge to a maximum wait time D_max.

10. The system search method of claim 9, wherein the increasing of the wait time D₀ resets, when a system to use is found during a k+1^th search time, the wait time D_o to min {D₀+α

·

kⁿ·

D_c, D_max}, wherein α

comprises a constant and n comprises a natural number.

11. A mobile terminal comprising:

a wireless communication unit for attempting to connect to a mobile communication system, and for receiving system information from a connected mobile communication system;

a storage unit for storing a search parameter specifying a first search time S₀ and search periods (D_o+S₁) of a wait time D_o and search time S₁;

a search section for performing, upon occurrence of a system loss, an initial system search to search for a system for the first search time S₀ through the wireless communication unit; and

a first resetter for increasing, when a system is found during the first search time S₀, the first search time S₀ to reset the search parameter.

12. The mobile terminal of claim 11, wherein the first resetter increments the first search time S₀ by a preset duration S_c to an extent not longer than a maximum search time S_max.

13. The mobile terminal of claim 12, wherein the first resetter decreases the wait time D_o.

14. The mobile terminal of claim 13, wherein the first resetter decrements the wait time D_o by a preset duration D_c at a time to the extent not shorter than a minimum wait time D_min.

15. The mobile terminal of claim 14, further comprising a second resetter for decreasing, when a system is not found during the first search time S₀, the first search time S₀ to reset the search parameter.

16. The mobile terminal of claim 15, wherein the second resetter decreases the first search time S₀ so that the first search time S₀ rapidly converges to a minimum search time S_min.

17. The mobile terminal of claim 16, wherein the second resetter resets, when a system is found during a k+1^th search time, the first search time S₀ to max {S₀−

α

·

kⁿ·

S_c, S_min}, wherein k comprises a natural number, α

comprises a constant and n comprises a natural number.

18. The mobile terminal of claim 17, wherein the second resetter increases the wait time D_o.

19. The mobile terminal of claim 18, wherein the second resetter increases the wait time D_o so that the wait time D_o rapidly converges to a maximum wait time D_max.

20. The mobile terminal of claim 19, wherein the second resetter resets, when a system to use is found during a k+1^th search time, the wait time D_o to min {D₀+α

·

kⁿ·

D, D_max}, wherein α

comprises a constant and n comprises a natural number.