Motion detecting wireless receiver and signal monitoring method therefor

• US 7,136,680 B2
• Filed: 03/31/2003
• Issued: 11/14/2006
• Est. Priority Date: 03/31/2003
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Borras, Jaime, Ballantyne, Wayne Wiggins, Leizerovich, Gustavo D.
• Primary Examiner(s): Feild, Joseph
• Assistant Examiner(s): Nguyen, David Q.
• Application Number:
  US10/403,231
• Publication Number:
  US 20040192347A1
• Time in Patent Office: 1,324 Days
• Field of Search: 455/456.1, 455/529, 455/572, 455/343, 455/524, 455/434, 455/456.3, 455/515, 455/456.14, 702/188, 320/311
• US Class Current: 455/574
• CPC Class Codes: G01S 19/34 Power consumption
• CPC Class Codes: H04W 52/0254 detecting a user operation or a tactile contact or a motion of the device
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A portable wireless transceiver (104) includes a receiver (206) for monitoring transmissions from neighboring transceivers (106A and 106B) to select a transceiver to use for communications. The portable wireless transceiver (104) further has a motion detector (204) for determining whether or not the portable wireless transceiver (104) is moving. If the portable wireless transceiver (104) is determined to not be moving, a processor (202) alters a schedule for monitoring of neighboring transceivers (106A and 106B) so that the monitoring is performed less frequently, thereby reducing power consumption by the portable wireless transceiver (104).

Claims

1. A method comprising:

monitoring, at a receiver, for at least one transmission from a plurality of stations, wherein the monitoring is performed at a series of time points defined by a first time schedule in order to determine one station in the plurality of stations with which to communicate;

determining, independently of the monitoring, if the receiver is not moving; and

continuing the monitoring by adjusting, in response to a determination that the receiver is not moving, the series of time points according to a second time schedule, wherein the series of time points defined by the second time schedule comprises time points that are separated by longer time intervals than the series of time points defined by the first time schedule.

2. The method according to claim 1, wherein the determining if the receiver is not moving comprises time averaging movement observations.

3. The method according to claim 1, wherein the receiver comprises a GPS receiver.

4. The method according to claim 1, wherein the receiver is a receiver portion of a cellular telephone transceiver, and wherein the plurality of stations comprises a cellular base station transceiver.

5. The method according to claim 1, wherein the determining if the receiver is not moving comprises determining movement with a global positioning receiver.

6. The method according to claim 1, wherein the determining if the receiver is not moving comprises monitoring an accelerometer.

7. The method according to claim 6, wherein the accelerometer comprises at least one of a one axis accelerometer, a two axis accelerometer, and a three axis accelerometer.

8. The method according to claim 6, wherein the determining comprises determining if acceleration noise output of the accelerometer is larger than a predetermined threshold.

9. A wireless receiver, comprising:

a receiver for monitoring for a transmission from a plurality of stations at a series of time points, wherein the series of time points is defined by a first time schedule;

a motion detector for determining, independently of the monitoring of the receiver, if the receiver is not moving; and

a transmission monitor scheduler, communicatively coupled to the accelerometer and the receiver, for adjusting, in response to a determination that the receiver is not moving, the series of time points according to a second time schedule, wherein the series of time points defined by the second time schedule comprises time points that are separated by longer time intervals than the series of time points defined by the first time schedule.

10. The wireless receiver according to claim 9, wherein the motion detector comprises an observation processor that time averages movement observations.

11. The wireless receiver according to claim 9, wherein the receiver is a receiver portion of a cellular telephone transceiver, and wherein the plurality of stations comprises a cellular base station.

12. The wireless receiver according to claim 9, wherein the receiver comprises a GPS receiver.

13. The wireless receiver according to claim 9, wherein the motion detector comprises a global positioning receiver.

14. The wireless receiver according to claim 9, wherein the motion detector comprises an accelerometer.

15. The wireless receiver according to claim 14, wherein the accelerometer comprises at least one of a one axis accelerometer, a two axis accelerometer, and a three axis accelerometer.

16. The wireless receiver according to claim 14, wherein the motion detector determines that the wireless receiver is moving based upon acceleration noise reported by the accelerometer.

17. A computer program product comprising computer programming instructions for:

monitoring, at a receiver, for a transmission from a plurality of stations, wherein the monitoring is performed at a series of time points defined by a first time schedule in order to determine one station in the plurality of stations with which to communicate;

determining, independently of the monitoring, if the receiver is not moving; and

continuing the monitoring by adjusting, in response to a determination that the receiver is not moving, the series of time points according to a second time schedule, wherein the series of time points defined by the second time schedule comprises time points that are separated by longer time intervals than the series of time points defined by the first time schedule.