Radio communication system, radio terminal, radio network, radio communication method and program

• US 9,544,868 B2
• Filed: 01/05/2011
• Issued: 01/10/2017
• Est. Priority Date: 01/07/2010
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Kobayashi, Kosei
• Primary Examiner(s): TRAN, MONG-THUY THI
• Application Number:
  US13/520,990
• Publication Number:
  US 20130005356A1
• Time in Patent Office: 2,197 Days
• Field of Search: 455/456.1, 455/456.3, 455/423, 455/67.11, 455/574, 455/456.2
• US Class Current: 1/1
• CPC Class Codes: G01S 5/0027 of actual mobile position, i.e. position determined on mobile
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 64/003 locating network equipment

Abstract

A radio terminal, which is operative to perform a measurement on the basis of a measurement condition designated by a radio network and to report the result of the measurement, comprises: a position-determination precision calculating means for calculating a position-determination precision of the radio terminal; a required position-determination precision holding means for holding a required position-determination precision related to a condition of position-determination precision; and a measurement reporting control means for comparing the required position-determination precision with the calculated position-determination precision and for controlling the execution of at least one of the radio terminal'"'"'s measurement and the radio terminal'"'"'s reporting of the measurement result to the radio network.

Claims

1. A radio terminal that performs measurement based on a measurement condition to be indicated by a radio network, and reports a measurement result including at least a positioning result, comprising:

a positioning unit that measures a location of said radio terminal;

a positioning accuracy calculator that calculates a positioning accuracy of the measured location of said radio terminal;

a required positioning accuracy maintaining unit that maintains a required positioning accuracy related to a condition of the positioning accuracy; and

a measurement reporting controller that compares said required positioning accuracy with said calculated positioning accuracy, and controls, in accordance with the calculated position accuracy, execution of at least the reporting of said measurement result to the radio network by the radio terminal, in order to report only said measurement result including a positioning result satisfying said required positioning accuracy.

2. The radio terminal according to claim 1, wherein said measurement reporting controller does not report at least one part of said measurement result to the radio network when said calculated positioning accuracy does not satisfy said required positioning accuracy.

3. The radio terminal according to claim 1, wherein said measurement reporting controller changes an interval of the reporting of said measurement result to the radio network when said calculated positioning accuracy does not satisfy said required positioning accuracy.

4. The radio terminal according to claim 3, wherein said measurement reporting controller makes the interval of the reporting of said measurement result to the radio network long when said calculated positioning accuracy does not satisfy said required positioning accuracy.

5. The radio terminal according to claim 1, wherein said measurement reporting controller does not measure at least one part of information when said calculated positioning accuracy does not satisfy said required positioning accuracy.

6. The radio terminal according to claim 1, wherein said measurement reporting controller changes a measurement interval of the information when said calculated positioning accuracy does not satisfy said required positioning accuracy.

7. The radio terminal according to claim 6, wherein said measurement reporting controller makes the measurement interval of the information long when said calculated positioning accuracy does not satisfy said required positioning accuracy.

8. The radio terminal according to claim 1, said radio terminal comprising a GPS (Global Positioning System) as said positioning unit and calculating said positioning accuracy using at least one of a geometric arrangement of GPS satellites viewed from the radio terminal, a number of used GPS satellites, a received strength of a GPS radio wave.

9. The radio terminal according to claim 1, said radio terminal comprising an OTDOA (Observed Time Difference Of Arrival) as said positioning unit and calculating said positioning accuracy using at least one of a number of radio base stations detected by said radio terminal, the location of the radio base station measured by said radio terminal, a received electronic field strength of the radio wave that arrives from the radio base station, said received electronic field strength measured by said radio terminal, and a signal-to-noise ratio of the radio wave that arrives from the radio base station, said signal-to-noise ratio measured by said radio terminal.

10. The radio terminal according to claim 1, said radio terminal comprising a GPS (Global Positioning System) as said positioning unit and calculating said positioning accuracy using a geometric arrangement of GPS satellites viewed from the radio terminal.

11. A radio terminal that performs measurement based on a measurement condition to be indicated by a radio network, and reports a measurement result including at least a positioning result, comprising:

a positioning unit that measures a location of said radio terminal;

a positioning accuracy calculator that calculates a positioning accuracy of the measured location of said radio terminal; and

a measurement reporting controller that controls, in accordance with the calculated position accuracy, execution of at least the reporting of said measurement result to the radio network by the radio terminal, in order to report only said measurement result including a positioning result satisfying said required positioning accuracy.

12. A radio network in a radio communication system in which a radio terminal performs measurement of a location of said radio terminal based on a measurement condition to be indicated by the radio network and reports, in accordance with a position accuracy of the measured location of said radio terminal, a measurement result including at least a positioning result, comprising a required positioning accuracy notifying unit that notifies to the radio terminal a required positioning accuracy related to the positioning accuracy of the radio terminal, being a condition for controlling execution of at least the reporting of said measurement result to the radio network by the radio terminal, in order to report only said measurement result including a positioning result satisfying said required positioning accuracy.

13. The radio network according to claim 12, wherein said required positioning accuracy notifying unit changes the required positioning accuracy according to at least one of a reporting status from the radio terminal, a geographic factor, and an object to be measured by the radio terminal.

14. The radio network according to claim 13, wherein said required positioning accuracy notifying unit changes the required positioning accuracy from a high positioning accuracy to a low positioning accuracy according to a decrease in a number of reports from the radio terminal.

15. The radio network according to claim 13, wherein said required positioning accuracy notifying unit configures the required positioning accuracy based on the location in which the radio terminal or a radio base station is present or a geographic attribute thereof.

16. The radio network according to claim 12, wherein said positioning accuracy is at least one of:

positioning accuracy calculated using at least one of a geometric arrangement of GPS satellites viewed from the radio terminal, a number of used GPS satellites, a received strength of a GPS radio wave; and

positioning accuracy calculated using at least one of a number of radio base stations detected by said radio terminal, the location of the radio base station measured by said radio terminal, a received electronic field strength of the radio wave that arrives from the radio base station, said received electronic field strength measured by said radio terminal, and a signal-to-noise ratio of the radio wave that arrives from the radio base station, said signal-to-noise ratio detected by said radio terminal.

17. A radio communication system in which a radio terminal performs measurement based on a measurement condition to be indicated by the radio network and reports a measurement result including at least a positioning result:

wherein the radio network comprises a required positioning accuracy notifying unit that notifies to the radio terminal a required positioning accuracy related to a condition of a positioning accuracy for controlling execution of at least the reporting of said measurement result to the radio network by the radio terminal; and

wherein the radio terminal comprises;

a positioning unit that measures a location of said radio terminal;

a positioning accuracy calculator that calculates a positioning accuracy of the measured location of said radio terminal; and

a measurement reporting controller that compares said required positioning accuracy with said calculated positioning accuracy, and controls, in accordance with the calculated position accuracy, execution of at least the reporting of said measurement result to the radio network by the radio terminal, in order to report only said measurement result including a positioning result satisfying said required positioning accuracy.

18. A radio communication system in which a radio terminal performs measurement based on a measurement condition to be indicated by the radio network and reports a measurement result including at least a positioning result, comprising:

a positioning unit that measures a location of said radio terminal;

a positioning accuracy calculator that calculates a positioning accuracy of the measured location of said radio terminal; and

a measurement reporting controller that controls, in accordance with the calculated position accuracy, execution of at least the reporting of said measurement result to the radio network by the radio terminal, in order to report only said measurement result including a positioning result satisfying said required positioning accuracy.

19. A radio communication method of performing, by a radio terminal, measurement based on a measurement condition to be indicated by a radio network, and reporting, by a radio terminal, a measurement result including at least a positioning result, comprising:

notifying, by the radio network, a required positioning accuracy related to a condition of a positioning accuracy to the radio terminal;

measuring, by the radio terminal, a location of said radio terminal; and

calculating, by the radio terminal, the positioning accuracy of the measured location of said radio terminal, comparing, by the radio terminal, said required positioning accuracy notified from said radio network with said calculated positioning accuracy, and controlling, by the radio terminal and in accordance with the calculated position accuracy, execution of at least the reporting of said measurement result to the radio network by the radio terminal, in order to report only said measurement result including a positioning result satisfying said required positioning accuracy.

20. A radio communication method of performing, by a radio terminal, measurement based on a measurement condition to be indicated by a radio network, and reporting, by a radio terminal, a measurement result including at least a positioning result, comprising:

measuring a location of said radio terminal;

calculating a positioning accuracy of the measured location of said radio terminal; and

controlling, in accordance with the calculated position accuracy, execution of at least the reporting of said measurement result to the radio network by the radio terminal, in order to report only said measurement result including a positioning result satisfying said required positioning accuracy.

21. A non-transitory computer readable storage medium storing a program of a radio terminal that performs measurement based on a measurement condition to be indicated by the radio network and reports a measurement result including at least a positioning result, causing the radio terminal to execute the processes:

measuring a location of said radio terminal;

calculating a positioning accuracy of the measured location of said radio terminal; and

comparing a required positioning accuracy related to a condition of the positioning accuracy with said calculated positioning accuracy, and controlling, in accordance with the calculated position accuracy, execution of at least the reporting of said measurement result to the radio network by the radio terminal, in order to report only said measurement result including a positioning result satisfying said required positioning accuracy.

22. A non-transitory computer readable storage medium storing a program of an information processing device in a radio communication system in which a radio terminal performs measurement of a location of said radio terminal based on a measurement condition to be indicated by the radio network and reports, in accordance with a position accuracy of the measured location of said radio terminal, a measurement result including at least a positioning result, causing said information processing device to execute a process of notifying to the radio terminal a required positioning accuracy related to the positioning accuracy of the radio terminal, being a condition for controlling execution of at least the reporting of said measurement result to the radio network by the radio terminal, in order to report only said measurement result including a positioning result satisfying said required positioning accuracy.