Positioning device, mobile station and positioning method

1. A positioning device, comprising:

a processor configured to execute a positioning program;

and a memory configured to store the positioning program, wherein the processor, based on the positioning program, performs operations to:

receive wireless quality information indicating wireless quality between a mobile station and a base station and information indicating a direction and an angular accelerometer value of the mobile station, wherein the wireless quality information is measured at a plurality of points in time;

acquire measuring data to be used for measuring a location of the mobile station based on the direction and the orientation, from data in which each of regions as location candidates of the mobile station is associated with respective wireless qualify information;

measure the location of the mobile station based on the wireless quality information and the measuring data;

calculate a stability of wireless quality between the mobile station and the base station by using the wireless quality information measured at the plurality of points in time;

determine whether to use the stability for measuring the location of the mobile station based on the angular accelerometer value;

and measure the location of the mobile station based on the wireless quality information and the stability of wireless quality in response to determining to use the stability.

2. The positioning device of claim 1 , wherein the processor estimates a location corresponding to wireless quality information which is included in the data and is closest to the wireless quality information transmitted from the mobile station as the location of the mobile station.

3. The positioning device of claim 1 , wherein the processor receiving unit receives information indicating presence or absence of an adjacent object to the mobile station, and wherein the processor measures the location of the mobile station based on the wireless quality information and the information indicating the presence or absence of the adjacent object.

4. The positioning device of claim 1 , wherein the direction indicates a use state of the mobile station and the orientation indicates a direction which the mobile station faces.

5. A positioning method for use in a positioning device, the method comprising:

receiving wireless quality information indicating wireless quality between a mobile station and a base station and information indicating a direction and an angular accelerometer value of the mobile station, wherein the wireless quality information is measured at a plurality of points in time;

acquiring measuring data to be used for measuring a location of the mobile station based on the direction and the orientation, from among data in which each of regions as location candidates of the mobile station are associated with the wireless quality information;

measuring the current location of the mobile station based on the wireless quality information and the measuring data;

calculating a stability of wireless quality between the mobile station and the base station by using the wireless quality information measured at the plurality of points in time;

determining whether to use the stability for measuring the location of the mobile station based on the angular accelerometer value;

and measuring the location of the mobile station based on the wireless quality information and the stability of wireless quality in response to determining to use the stability.

6. The positioning method of claim 5 , further comprising,

estimating a location corresponding to wireless quality information which is included in the data and is closest to the wireless quality information transmitted from the mobile station as the location of the mobile station.

7. The positioning method of claim 5 , further comprising:

receiving information indicating presence or absence of an adjacent object to the mobile station; and

measuring the location of the mobile station based on the wireless quality information and the information indicating the presence or absence of the adjacent object.

8. The positioning method of claim 5 , wherein the direction indicates a use state of the mobile station and the orientation indicates a direction which the mobile station faces.