Method and system for positioning wireless device

1. A method, comprising:

providing a database of positioning data, each positioning data associating position information of a location with an identifier of a wireless station for providing wireless connection at the location and a strength of a signal received at the location;

receiving a position request from a wireless device that receives an identifier and a signal strength from a specific wireless station;

identifying the specific wireless station using the identifier to retrieve a group of positioning data from the database;

selecting a subset in the group of positioning data using the received signal strength;

determining position information of the wireless device using the selected subset of positioning data; and

calculating an estimated uncertainty value associated with the determined position information of the wireless device using circular error probable (CEP) theory to calculate a threshold percentage of radius of the determined position information of the wireless device.

2. The method of claim 1 , wherein the selecting the subset in the group of positioning data further comprises:

selecting, when the received signal strength is inside the boundaries of a group of positioning data, the subset when the received signal strength is inside the boundaries of the subset.

3. The method of claim 2 , further comprising:

determining the subset when the received signal strength is outside the boundaries of a group of positioning data.

4. The method of claim 3 , wherein the determining the subset is based on calculating a closeness between the received signal strength and each signal strength in the group of positioning data.

5. The method of claim 4 , wherein the calculating the closeness is based on exponential decay model.

6. The method of claim 1 , wherein the determining position information of the wireless device further comprises:

weigh-averaging position information in the selected subset of positioning data when the received signal strength is inside the boundaries of a group of positioning data.

7. The method of claim 6 , further comprising:

averaging position information in the selected subset of positioning data when the received signal strength is outside the boundaries of a group of positioning data.

8. The method of claim 6 , wherein the calculated threshold percentage of radius is 95% radius of the determined position information of the wireless device.

9. The method of claim 6 , wherein a weight of a position is determined based on the received signal strength to each signal strength in the selected subset of positioning data.

10. An apparatus, comprising:

a storage medium configured to provide a database of positioning data, each positioning data associating position information of a location with an identification of a wireless station device for providing wireless connection at the location and the strength of a signal received at the location; and

a processor configured to:

receive a position request from a wireless device that receives an identifiers identifier and the strength of a signal from a specific wireless station;

identify the specific wireless station using the identifier to retrieve a group of positioning data from a database;

select a subset in the group of positioning data using the received signal strength;

determine position information of the wireless device using the selected subset of positioning data; and

calculate an estimated uncertainty value associated with the determined position information of the wireless device using circular error probable (CEP) theory to calculate a threshold percentage of radius of the determined position information of the wireless device.

11. The apparatus of claim 10 , wherein the processor selects the subset in the group of positioning data further comprises:

select when the received signal strength is inside the boundaries of a group of positioning data, the subset when the received signal strength is inside the boundaries of the subset.

12. The apparatus of claim 11 , wherein the processor configured to select the subset in the group of positioning data further comprising comprising: determine the subset when the received signal strength is outside the boundaries of a the group of positioning data.

13. The apparatus of claim 12 , wherein the processor determines the subset is based on calculating the a closeness between the received signal strength and each signal strength in the group of positioning data.

14. The apparatus of claim 12 13, wherein the processor calculates the a closeness is based on exponential decay model.

15. The apparatus of claim 10 , wherein the processor determines position information of the wireless device further comprises:

weigh-average position information in the selected subset of positioning data when the received signal strength is inside the boundaries of a group of positioning data.

16. The apparatus of claim 15 , wherein the processor configured to determine position information of the wireless device further comprising comprises:

average position information in the selected subset of positioning data when the received signal strength is outside the boundaries of a the group of positioning data.

17. The apparatus of claim 15 , wherein the calculated threshold percentage of radius is 95% radius of the determined position information of the wireless device.

18. The apparatus of claim 15 , wherein the processor determines a weight of a position based on the received signal strength to each signal strength in the selected subset of positioning data.

19. An apparatus, comprising:

a data retriever that comprises a reception module configured to receive the identifiers and the strength of signals from wireless stations, and a mapping module configured to identify the wireless stations using the identifiers;

a data processor that comprises a retrieval module configured to extract the groups of positioning data from a database, and a clustering module configured to select the subsets in the groups of positioning data using the strength of the received signals;

a location estimator that comprises a position module configured to determine position information of the a wireless device using the selected subsets of in the groups of positioning data, calculate an estimated uncertainty value associated with the determined position information of the wireless device using a circular error probable (CEP) theory to calculate a threshold percentage of a radius of the determined position information of the wireless device, and a position filtering module configured to exclude outliers when outliers whose distances of the outliers exceed a threshold; and

a data manager that comprises a cluster allocation module configured to reset clustering boundaries of a subset when a requirement is satisfied.