Managing the measurement of signals

• US 8,462,046 B2
• Filed: 10/01/2008
• Issued: 06/11/2013
• Est. Priority Date: 10/01/2008
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Syrjarinne, Jari Tapani, Alanen, Kimmo Marko Tapani, Honkanen, Tuomo Tapani, Pietila, Pertti Samulli, Kappi, Jani Mikael
• Primary Examiner(s): LIU, HARRY K
• Application Number:
  US13/121,812
• Publication Number:
  US 20110175773A1
• Time in Patent Office: 1,714 Days
• Field of Search: 342/357.74
• US Class Current: 342/357.74
• CPC Class Codes: G01S 19/34 Power consumption
• CPC Class Codes: G01S 19/37 Hardware or software details of the signal processing chain
• CPC Class Codes: G01S 5/0018 Transmission from mobile station to base station

Abstract

For managing measurements on signals, a quality of received signals, for which a measurement circuit provides measurement results, is monitored. In the case that the quality does not exceed a set quality before an end of a reporting period, a reporting of measurement results that are available at the end of the reporting period is caused. In the case that the quality exceeds the set quality at a measurement instant before the end of the reporting period, the measurement circuit is put to a sleep mode and a reporting of extrapolated measurement results is caused, the extrapolated measurement results being measurement results from a measurement instant before the measurement circuit was put to a sleep mode extrapolated to the end of the reporting period.

Claims

1. A method comprising:

monitoring a quality of received signals for which a measurement circuit provides measurement results;

in the case that the quality does not exceed a set quality before an end of a reporting period, causing a reporting of measurement results that are available at the end of the reporting period; and

in the case that the quality exceeds the set quality at a measurement instant before the end of the reporting period, putting the measurement circuit to a sleep mode and causing a reporting of extrapolated measurement results, the extrapolated measurement results being measurement results from a measurement instant before the measurement circuit was put to a sleep mode extrapolated to the end of the reporting period.

2. The method according to claim 1, wherein the measurement circuit put to a sleep mode is activated again one of:

at a beginning of a next reporting period;

at a predetermined time before a beginning of a next reporting period; and

at a point of time before a beginning of a next reporting period that depends on a length of an extrapolation required for the current reporting period.

3. The method according to claim 1, wherein the quality of received signals is monitored by evaluating at least one of the following quantities:

a dilution of precision determined for satellites transmitting the received signals;

uncertainties in measuring a code phase of the received signal;

uncertainties in measuring a Doppler frequency in the received signal; and

a circular error probable.

4. The method according to claim 3, wherein the at least one evaluated quantity includes extrapolation errors.

5. The method according to claim 1, comprising receiving control information comprising at least one of:

a maximum length for a required extrapolation that has to be ensured before putting the measurement circuit to the sleep mode;

at least one target value for adjusting the set quality;

a target value for an accuracy of position information, which is to be determined based on the reported measurement results, as a basis for adjusting the set quality;

intermediate results enabling an estimation of an expected accuracy of position information, which is to be determined based on the reported measurement results; and

a length of the reporting period.

6. The method according to claim 1, wherein the measurement results are reported as a basis for at least one of

positioning calculations;

and

a navigation application.

7. The method according to claim 1, wherein the signals are satellite signals of a global navigation satellite system.

8. An apparatus comprising a control circuitry implemented in hardware or at least one processor and at least one memory including computer program code, the control circuitry configured to or the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform:

monitor a quality of received signals for which a measurement circuit provides measurement results;

report measurement results that are available at the end of a reporting period, in the case that the quality does not exceed a set quality before an end of the reporting period; and

put the measurement circuit to a sleep mode and cause a reporting of extrapolated measurement results, in the case that the quality exceeds the set quality at a measurement instant before the end of the reporting period, the extrapolated measurement results being measurement results from a measurement instant before the measurement circuit was put to a sleep mode extrapolated to the end of the reporting period.

9. The apparatus according to claim 8, wherein the control circuitry is configured to or the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to reactivate the measurement circuit put to a sleep mode one of:

at a beginning of a next reporting period;

at a predetermined time before a beginning of a next reporting period; and

at a point of time before a beginning of a next reporting period that depends on a length of an extrapolation required for the current reporting period.

10. The apparatus according to claim 8, wherein the control circuitry is configured to or the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to monitor the quality of received signals by evaluating at least one of the following quantities:

a dilution of precision determined for satellites transmitting the received signals;

uncertainties in measuring a code phase of the received signal;

uncertainties in measuring a Doppler frequency in the received signal; and

a circular error probable.

11. The apparatus according to claim 10, wherein the at least one evaluated quantity includes extrapolation errors.

12. The apparatus according to claim 8, wherein the control circuitry is configured to or the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to receive control information comprising at least one of:

a maximum length for a required extrapolation that has to be ensured before putting the measurement circuit to the sleep mode;

at least one target value for adjusting the set quality;

a target value for an accuracy of position information, which is to be determined based on the reported measurement results, as a basis for adjusting the set quality;

intermediate results enabling an estimation of an expected accuracy of position information, which is to be determined based on the reported measurement results; and

a length of the reporting period.

13. The apparatus according to claim 8, wherein the control circuitry is configured to or the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to report the measurement results as a basis for at least one of

positioning calculations;

and

a navigation application.

14. The apparatus according to claim 8, wherein the signals are satellite signals of a global navigation satellite system.

15. The apparatus according to claim 8, comprising the measurement circuit.

16. The apparatus according to claim 15, wherein the control circuitry or the at least one memory and the at least one processor, on the one hand, and the measurement circuit, on the other hand, belong to a measurement engine and wherein the control circuitry is configured to or the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to report the measurement results to a positioning engine.

17. The apparatus according to claim 16, comprising the positioning engine, the positioning engine being configured to determine a position of the apparatus based on reported measurement results for use by a navigation application.

18. The apparatus according to claim 8, comprising a display.

19. The apparatus according to claim 8, wherein the apparatus is one of

a module for an electronic device;

a mobile communication device; and

a personal navigation device.

20. A non-transitory computer readable storage medium in which computer program code is stored, the computer program code causing an apparatus to perform the following when executed by a processor:

monitoring a quality of received signals for which a measurement circuit provides measurement results;

in the case that the quality does not exceed a set quality before an end of a reporting period, causing a reporting of measurement results that are available at the end of the reporting period; and

in the case that the quality exceeds the set quality at a measurement instant before the end of the reporting period, putting the measurement circuit to a sleep mode and causing a reporting of extrapolated measurement results, the extrapolated measurement results being measurement results from a measurement instant before the measurement circuit was put to a sleep mode extrapolated to the end of the reporting period.

21. An apparatus comprising:

means for monitoring a quality of received signals for which means for measuring provide measurement results;

means for causing a reporting of measurement results that are available at the end of a reporting period in the case that the quality does not exceed a set quality before an end of a reporting period;

means for putting the measurement circuit to a sleep mode in the case that the quality exceeds a set quality at a measurement instant before the end of the reporting period; and

means for causing a reporting of extrapolated measurement results in the case that the quality exceeds the set quality at a measurement instant before the end of the reporting period, the extrapolated measurement results being measurement results from a measurement instant before the measurement circuit was put to a sleep mode extrapolated to the end of the reporting period.