Automatic time setting method of asynchronous mobile communication terminal

• US 20030083077A1
• Filed: 10/23/2002
• Published: 05/01/2003
• Est. Priority Date: 10/26/2001
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chung, In-Bok
• Granted Patent: US 7,069,020 B2
• Time in Patent Office: Days
• US Class Current: 455/456.1
• CPC Class Codes: H04W 8/183 Processing at user equipment or user record carrier

Abstract

In an automatic time setting method of an asynchronous mobile communication terminal, when a user moves from a first area to a second area in a GSM/GPRS network, a time difference between the two areas is calculated by using LAIs or RAIs of the first and second areas, and a time of the terminal is reset according to the calculated time difference. The asynchronous mobile communication terminal includes a RTC (real time clock) circuit for generating time information; a memory for storing time difference information between areas; and a CPU for reading a time difference corresponding to area information of a first and a second areas from the memory when a user moves from the first area to the second area and controlling the RTC circuit.

Claims

1. An asynchronous mobile communication terminal, comprising:

a RTC (real time clock) circuit for generating time information;

a memory for storing time difference information between areas; and

a CPU for reading a time difference corresponding to area information of a first area and a second area from the memory when a user moves from the first area to the second area and controlling the RTC circuit.

2. The terminal of claim 1, further comprising:

a LCD for displaying time information of the RTC circuit.

3. The terminal of claim 1, wherein the memory includes a time difference table.

4. The terminal of claim 3, wherein the time difference table includes:

area information of the first and second areas; and

time difference information according to the area information of the first and second areas.

5. The terminal of claim 4, wherein the time difference table further includes summer time information.

6. The terminal of claim 1, wherein the area information is LAI (location area identification) provided from a base station.

7. The terminal of claim 6, wherein the LAI includes:

a MCC (mobile country code);

a MNC (mobile network code); and

a LAC (location area code).

8. The terminal of claim 1, wherein the area information is RAI (routing area identification) provided from a base station.

9. The terminal of claim 8, wherein the RAI includes:

a MCC (mobile country code);

a MNC (mobile network code);

a LAC (location area code); and

a RAC (routing area code).

10. An asynchronous mobile communication terminal, comprising:

a RTC (real time clock) circuit for generating time information;

a time difference table for storing time difference information between areas;

a CPU for reading a time difference corresponding to a LAI (location area identification) or a RAI (routing area identification) of a first area and a second area from the time table when a user moves from the first area to the second area in a certain network and controlling the RTC circuit; and

a LCD for displaying the time information generated by the RTC circuit.

11. The terminal of claim 10, the time difference table includes:

a LAI and a RAI of the first area;

a LAI and a RAI of the second area;

time difference information according to the LAIs and RAIs of the first and second areas; and

summer time information.

12. The terminal of claim 10, wherein the LAI includes:

a MCC (mobile country code);

a MNC (mobile network code); and

a LAC (location area code).

13. The terminal of claim 10, wherein the RAI includes:

a MCC (mobile country code);

a MNC (mobile network code);

a LAC (location area code); and

a RAC (routing area code).

14. A time setting method of an asynchronous mobile communication terminal, comprising:

requesting area information of a second area to a base station when a user moves from a first area to the second area in an asynchronous network;

storing the area information of the second area provided from the base station in a time difference table;

reading a time difference corresponding to the area information of the first and second areas from the time difference table; and

resetting a time of the terminal by using the read time difference.

15. The method of claim 14, wherein the certain network is a GSM network or a GPRS network.

16. The method of claim 14, wherein the resetting step includes the sub-steps of:

checking whether there is a time difference;

outputting a time control signal corresponding to a pertinent time difference to a RTC (real time clock) circuit when there is the time difference;

generating time information newly by changing a clock count value of the RTC circuit according to the time control signal; and

displaying the newly generated time information.

17. The method of claim 14, wherein the time difference table includes:

area information of the first and second areas;

time difference corresponding to the area information of the first and second areas; and

summer time information.

18. The method of claim 14, wherein the area information is LAI (location area identification).

19. The method of claim 18, wherein the LAI includes:

a MCC (mobile country code);

a MNC (mobile network code); and

a LAC (location area code).

20. The method of claim 14, wherein the area information is RAI (routing area identification).

21. The method of claim 19, wherein the RAI includes:

a MCC (mobile country code);

a MNC (mobile network code);

a LAC (location area code); and

a RAC (routing area code).