MOBILE COMMUNICATION TERMINAL WITH GPS FUNCTION, POSITIONING SYSTEM, OPERATION CONTROL METHOD, AND PROGRAM

• US 20100041416A1
• Filed: 09/11/2007
• Published: 02/18/2010
• Est. Priority Date: 10/18/2006
• Status: Active Grant

• Current Assignee: Lenovo Innovations Ltd Hong Kong (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Manzen, Yoshihisa
• Granted Patent: US 8,345,658 B2
• Time in Patent Office: Days
• US Class Current: 455/456.100
• CPC Class Codes: G01S 19/235 Calibration of receiver components
• CPC Class Codes: G01S 19/24 Acquisition or tracking or demodulation of signals transmitted by the system synchronisation aspects of direct sequence spread spectrum modulation H04B1/7073

Abstract

The present invention is to provide a mobile communication terminal with a GPS function capable of further varying the positioning performance of each positioning mode preinstalled in the terminal. A GPS positioning section of the mobile communication terminal with the GPS function can perform positioning in a plurality of positioning modes using the A-GPS system. When a GPS control section of the mobile communication terminal with the GPS function causes the GPS positioning section to perform positioning, the GPS control section sets a positioning mode in the GPS positioning section, varies an allowable error of a communication synchronizing clock established between the terminal and a base station as a parameter relating to the positioning performance of GPS positioning based on the A-GPS system in which a fixed value has been conventionally used, and sets the allowable error in GPS positioning means.

Claims

1-11. -11. (canceled)

12. A mobile communication terminal with a GPS function including a GPS positioning unit which performs GPS (Global Positioning System) positioning using assist data received from a network, comprising:

a control unit which varies an allowable error of a communication synchronizing clock established between the mobile communication terminal and a base station of the network which is set in the GPS positioning unit for the GPS positioning using the assist data.

13. The mobile communication terminal with the GPS function according to claim 12, wherein

the control unit sets, in the GPS positioning unit, one of a plurality of positioning modes with different positioning performances the GPS positioning unit can operate as a mode in which the GPS positioning unit is to operate, varies the allowable error and sets the allowable error in the GPS positioning unit.

14. The mobile communication terminal with the GPS function according to claim 12, wherein the control unit sets the allowable error to a value larger than a set value and causes the GPS positioning unit to perform positioning again if the GPS positioning is unsuccessful.

15. The mobile communication terminal with the GPS function according to claim 12, further comprising a memory unit including a plurality of values as candidates for a value of the allowable error stored in advance.

16. A positioning system comprising:

a mobile communication terminal with a GPS function according to claim 12; and

a network which supplies the assist data to the mobile communication terminal with the GPS function.

17. An operation control method for a mobile communication terminal with a GPS function including a GPS positioning unit which performs GPS (Global Positioning System) positioning using assist data received from a network, characterized by comprising:

a step of varying an allowable error of a communication synchronizing clock established between the mobile communication terminal and a base station of the network which is set in the GPS positioning unit for the GPS positioning using the assist data.

18. The operation control method according to claim 17, wherein the step comprises setting, in the GPS positioning unit, one of a plurality of positioning modes with different positioning performances in which the GPS positioning unit is to operate, varying the allowable error and setting the allowable error in the GPS positioning unit.

19. The operation control method according to claim 17, further comprising a step of setting the allowable error to a value larger than a set value and causing the GPS positioning unit to perform positioning again if the GPS positioning is unsuccessful.

20. A storage medium for storing a program for causing a computer to perform an operation control method for a mobile communication terminal with a GPS function including a GPS positioning unit which performs GPS (Global Positioning System) positioning using assist data received from a network, comprising:

a process of varying an allowable error of a communication synchronizing clock established between the mobile communication terminal and a base station of the network which is set in the GPS positioning unit for the GPS positioning using the assist data.

21. The storage medium for storing the program according to claim 20, wherein the process comprises setting, in the GPS positioning unit, one of a plurality of positioning modes with different positioning performances in which the GPS positioning unit is to operate, varying the allowable error and setting the allowable error in the GPS positioning unit.

22. The storage medium for storing the program according to claim 20, further comprising a process of setting the allowable error to a value larger than a set value and causing the GPS positioning unit to perform positioning again if the GPS positioning is unsuccessful.

23. A mobile communication terminal with a GPS function including GPS positioning means for performing GPS (Global Positioning System) positioning using assist data received from a network, comprising:

control means for varying an allowable error of a communication synchronizing clock established between the mobile communication terminal and a base station of the network which is set in the GPS positioning means for the GPS positioning using the assist data.