Method and Device for Indoor Position Resolution

• US 20140087707A1
• Filed: 09/21/2012
• Published: 03/27/2014
• Est. Priority Date: 09/21/2012
• Status: Active Grant

• Current Assignee: Senion AB (Verizon Communications Inc.)
• Original Assignee: SenionLab AB
• Inventors: Gustafsson, Fredrik, Lundquist, Christian, Skoglar, Per, Callmer, Jonas, Tornqvist, David
• Granted Patent: US 8,934,884 B2
• Time in Patent Office: Days
• US Class Current: 455/418
• CPC Class Codes: H04M 1/72457 according to geographic location
• CPC Class Codes: H04W 4/027 using movement velocity, acceleration information
• 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

The present invention relates to a system and method for managing energy consumption in a multi-sensor user-carried device during indoor navigation. In an embodiment of the invention, the device calculates a motion mode, a location mode, or an operational mode, each of which is used to modify sensor behavior, e.g., sampling rate, and/or CPU load, e.g., filtering and modeling complexity. The motion mode describes the manner in which the user is moving (standing still, walking, passive transport for example), the location mode describes a feature of the user'"'"'s location (near level change or intersection for example), and the operational mode describes the manner in which the user is interacting with the device (holding and monitoring, holding and not monitoring, not holding for example).

Claims

1. A method for managing power consumption of a portable battery-powered user carried device, wherein the user carried device includes a direction sensor, a movement sensor and a radio receiver and an application for using the sensors for indoor positioning of the user carried device, the method comprising:

determining a motion mode based on the information received from a first sensor selected from the direction sensor, a movement sensor and a radio receiver, wherein the motion mode describes a type of motion exhibited by the user carried device; and

based on the determined motion mode, controlling a sampling rate of a second sensor selected from the direction sensor, a movement sensor and a radio receiver, the second sensor being different from the first sensor.

2. The method according to claim 1, wherein the step of controlling the sampling rate comprises controlling the sampling rate to zero.

3. The method according to claim 1, wherein the motion mode describes a step frequency.

4. The method according to claim 1, wherein determining the motion mode comprises determining that the user is standing still.

5. The method according to claim 1, further comprising determining an operational mode based on the information received from one of the sensors, wherein the operational mode identifies a manner in which the user is operating the user carried device, and based on the determined operational mode, controlling a sampling rate of one or more of the sensors.

6. The method according to claim 5, wherein determining an operational mode comprises determining that the user carried device is held and monitored by the user.

7. The method according to claim 5, wherein determining an operational mode comprises determining that the user carried device is being held but not monitored by the user.

8. The method according to claim 5, wherein determining an operational mode comprises determining that the user carried device is not held by the user.

9. The method according to claim 1, wherein determining the motion mode further comprises determining that the user is about to enter or leave the indoor environment.

10. The method according to claim 1, wherein determining the motion mode comprises determining that the user may change floor.

11. The method according to claim 1, wherein the movement sensor is an inertial sensor.

12. The method according to claim 1, further comprising determining a location mode based on the information received from one of the sensors, wherein the location mode identifies a location of the user, and based on the determined location mode, controlling a sampling rate of one or more of the sensors.

13. The method according to claim 12, wherein the location mode identifies the location of the user as near a level change, near an intersection, near an entrance or near a wireless access point.

14. A method for managing power consumption of a portable battery-powered user carried device, wherein the user carried device includes a CPU, a direction sensor, a movement sensor and a radio receiver and an application for using the sensors for indoor positioning of the user carried device, the method comprising:

determining a motion mode based on the information received from a first sensor selected from the direction sensor, a movement sensor and a radio receiver, wherein the motion mode describes a type of motion exhibited by the user carried device; and

based on the determined motion mode, controlling a load on the CPU.