Motion detection method and portable device using the same

1. A motion detection method for a portable device, comprising:

generating a first cell location data at a first time point according to signals transmitted by a plurality of base stations;

generating a second cell location data at a second time point according to signals transmitted by a plurality of base stations, wherein the first time point and the second time point are two successive time points, and the first cell location data and the second cell location data comprises names or identification data of base stations detected by the portable device; and

determining whether the portable device is moved according to the first cell location data and the second cell location data;

wherein the step of determining whether the portable device is moved comprises steps of:

determining whether a difference of the base stations between the first and second time points exceeds a first threshold;

determining whether signal strength variation of static base stations exceeds a second threshold, wherein the static base stations are base stations in both the first cell location data and the second cell location data; and

when the first threshold and the second threshold are not exceeded, the portable device is determined to be static.

2. A motion detection method for a portable device, comprising:

generating a first cell location data at a first time point according to signals transmitted by a plurality of base stations;

generating a second cell location data at a second time point according to signals transmitted by a plurality of base stations, wherein the first time point and the second time point are two successive time points, and the first cell location data and the second cell location data comprises names or identification data of base stations detected by the portable device; and

determining whether the portable device is moved according to the first cell location data and the second cell location data;

wherein the step of determining whether the portable device is moved comprises steps of:

determining a first number of base stations detected by the portable device at the first time point according to the first cell location data;

determining a second number of base stations detected by the portable device at the second time point according to the second cell location data;

determining a third number of static base stations according to the first cell location data and the second cell location data;

calculating a first ratio between the third number and the first number or a second ratio between the third number and the second number; and

determining whether the portable device is moved according the first ratio or the second ratio;

wherein the static base stations are base stations in both the first cell location data and the second cell location data.

3. The motion detection method as claimed in claim 2 , wherein when the first number is not greater than the second number, the first ratio is used to determine whether the portable device is moved, and when the first number is greater than or equal to the second number, the second ratio is used to determine whether the portable device is moved.

4. A portable device with motion detection function, comprising:

a detection module to receive and analyze signals from base stations to retrieve information of the base stations wirelessly connected to the portable device;

a memory to store the information of base stations; and

a motion detection module to read the information of base stations and determine whether the portable device is moved according to the information of base stations stored in the memory;

wherein the detection module generates a first cell location data at a first time point according to signals transmitted by a plurality of base stations and generates a second cell location data at a second time point according to signals transmitted by a plurality of base stations, wherein the first time point and the second time point are two successive time points, and the first cell location data and the second cell location data comprises names or identification data of the base stations detected by the portable device;

wherein the motion detection module determines whether the portable device is moved by following steps:

determining whether a difference of the base stations between the first and second time points exceeds a first threshold;

determining whether signal strength variation of static base stations exceeds a second threshold, wherein the static base stations are base stations in both the first cell location data and the second cell location data; and

when the first threshold and the second threshold are not exceeded, the portable device is determined to be static.

5. The portable device as claimed in claim 4 , wherein the information comprises name of each detected base station and a signal strength of each detected base station.

6. A portable device with motion detection function, comprising:

a detection module to receive and analyze signals from base stations to retrieve information of the base stations wirelessly connected to the portable device;

a memory to store the information of base stations; and

a motion detection module to read the information of base stations and determine whether the portable device is moved according to the information of base stations stored in the memory;

wherein the detection module generates a first cell location data at a first time point according to signals transmitted by a plurality of the base stations and generates a second cell location data at a second time point according to signals transmitted by a plurality of the base stations, wherein the first time point and the second time point are two successive time points, and the first cell location data and the second cell location data comprises names or identification data of the base stations detected by the portable device,

wherein the motion detection module determines whether the portable device is moved by following steps:

determining a first number of base stations detected by the portable device at the first time point according to the first cell location data;

determining a second number of base stations detected by the portable device at the second time point according to the second cell location data;

determining a third number of static base stations according to the first cell location data and the second cell location data;

calculating a first ratio between the third number and the first number or a second ratio between the third number and the second number; and

determining whether the portable device is moved according the first ratio or the second ratio;

wherein the static base stations are base stations in both the first cell location data and the second cell location data.

7. The portable device as claimed in claim 6 , wherein when the first number is not greater than the second number, the first ratio is used to determine whether the portable device is moved, and when the first number is greater than or equal to the second number, the second ratio is used to determine whether the portable device is moved.

8. A motion detection system, comprising:

a portable device wirelessly connected to base stations to retrieve information corresponding to the base stations according to signals transmitted by the base stations; and

a network server to determine whether the portable device is moved according to the information transmitted from the portable device;

wherein a detection module of the portable device generates a first cell location data at a first time point according to signals transmitted by a plurality of the base stations and generates a second cell location data at a second time point according to signals transmitted by a plurality of the base stations, wherein the first time point and the second time point are two successive time points, and the first cell location data and the second cell location data comprises names or identification data of the base stations detected by the portable device;

wherein a motion detection module of the network server determines whether the portable device is moved by following steps:

determining whether a difference of the base stations between the first and second time points exceeds a first threshold;

determining whether signal strength variation of static base stations exceeds a second threshold, wherein the static base stations are base stations in both the first cell location data and the second cell location data; and

when the first threshold and the second threshold are not exceeded, the portable device is determined to be static.

9. A motion detection system, comprising:

a portable device wirelessly connected to base stations to retrieve information corresponding to the base stations according to signals transmitted by the base stations; and

a network server to determine whether the portable device is moved according to the information transmitted from the portable device;

wherein a detection module of the portable device generates a first cell location data at a first time point according to signals transmitted by a plurality of the base stations and generates a second cell location data at a second time point according to signals transmitted by a plurality of the base stations, wherein the first time point and the second time point are two successive time points, and the first cell location data and the second cell location data comprises names or identification data of the base stations detected by the portable device;

wherein a motion detection module of the network server determines whether the portable device is moved by following steps:

determining a first number of base stations detected by the portable device at the first time point according to the first cell location data;

determining a second number of base stations detected by the portable device at the second time point according to the second cell location data;

determining a third number of static base stations according to the first cell location data and the second cell location data;

calculating a first ratio between the third number and the first number or a second ratio between the third number and the second number; and

determining whether the portable device is moved according the first ratio or the second ratio;

wherein the static base stations are base stations in both the first cell location data and the second cell location data.

10. The motion detection system as claimed in claim 9 , wherein when the first number is not greater than the second number, the first ratio is used to determine whether the portable device is moved, and when the first number is greater than or equal to the second number, the second ratio is used to determine whether the portable device is moved.