Method, system and apparatus for locating a mobile communications device

• US 20090280827A1
• Filed: 05/09/2008
• Published: 11/12/2009
• Est. Priority Date: 05/09/2008
• Status: Active Grant

• Current Assignee: Mitel Networks Corporation
• Original Assignee: Mitel Networks Corporation
• Inventors: Michaud, Alain
• Granted Patent: US 8,023,965 B2
• Time in Patent Office: Days
• US Class Current: 455/456.100
• CPC Class Codes: G01S 5/02521 using a radio-map
• CPC Class Codes: H04L 65/1013 Network architectures, gateways, control or user entities
• CPC Class Codes: H04L 65/764 at the destination reformatting of additional data in video clients H04N21/4355
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04L 67/06 specially adapted for file transfer, e.g. file transfer protocol [FTP]
• CPC Class Codes: H04L 67/34 involving the movement of software or configuration parameters network booting or remote initial program loading [RIPL] G06F9/4416
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13248 Multimedia
• CPC Class Codes: H04Q 2213/13376 Information service, downloading of information, 0800/0900 services
• CPC Class Codes: H04Q 2213/13389 LAN, internet
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

A system, method and apparatus for locating a mobile communication device are provided. A data set is received, the data set comprising strengths of signals received at the mobile communication device from a plurality of wireless access points. The data set further comprises identifiers of wireless access points from which each signal was received. Scaled signal strengths are determined from the strengths of signals. The scaled signal strengths are compared with a record of signal strengths of wireless access points at given locations. Based on the comparing, a location of the mobile communication device is determined.

Claims

1. A method of locating a mobile communication device, comprising,

receiving a data set comprising strengths of signals received at the mobile communication device from a plurality of wireless access points, said data set further comprising identifiers of wireless access points from which each said signal was received;

determining scaled signal strengths from said strengths of signals;

comparing said scaled signal strengths with a record of signal strengths of wireless access points at given locations; and

determining a location of the mobile communication device based on said comparing.

2. The method of claim 1, further comprising determining a scaling factor, and wherein said determining scaled signal strengths comprises scaling said signal strengths by said scaling factor.

3. The method of claim 2, wherein said determining said scaling factor comprises designating a reference signal in said data set, determining a signal strength of said reference signal, and calculating said scaling factor based on said signal strength of said reference signal, such that said reference signal is normalized upon said scaling.

4. The method of claim 2, wherein said determining said scaling factor is based on an antenna strength of a survey device used to collect said record of signal strengths compared to an antenna strength of the mobile communications device.

5. The method of claim 4, further comprising receiving said antenna strength of the mobile communications device in conjunction with said data set.

6. The method of claim 4, further comprising receiving an identifier of the mobile communications device, and determining said antenna strength of the mobile communications device based on said identifier.

7. The method of claim 6, wherein said determining said antenna strength of the mobile communications device based on said identifier comprises retrieving said antenna strength from a database, said antenna strength of the mobile communications device stored in association with said identifier in said database.

8. The method of claim 2, further comprising receiving said scaling factor in conjunction with said data set.

9. The method of claim 2, further comprising receiving an identifier of the mobile communications device, and determining said scaling factor based on said identifier.

10. The method of claim 1, wherein said scaled signal strengths matches said record of signal strengths of wireless access points if a pattern of the scaled signal strengths matches a pattern in said record of signal strengths.

11. The method of claim 1, further comprising:

receiving at least one survey data set comprising;

strengths of survey signals, said survey signals comprising signals received at a mobile survey device from said plurality of wireless access points during a signal survey;

identifiers of wireless access points which originated each said survey signal; and

at least one location of said mobile survey device when said survey signals were received; and

processing said at least one survey data set to produce said record of signal strengths of wireless access points at given locations.

12. The method of claim 11, wherein said strength of each said signal comprises an average of strengths of each said signal.

13. The method of claim 11, further comprising storing said record of signal strengths.

14. The method of claim 1, wherein each said access point comprises an 802.11 access point and each said signal comprises an 802.11 signal.

15. The method of claim 1, wherein further comprising providing said location to at least one of a presence engine and a PBX for providing at least one of a location based service and a location based feature.

16. A computing device for locating a mobile communication device, comprising,

a communications interface enabled for receiving a data set comprising strengths of signals received at the mobile communication device from a plurality of wireless access points, said data set further comprising identifiers of wireless access points from which each said signal was received;

a processing unit in communication with said communications interface, said processing unit enabled for;

determining scaled signal strengths from said strengths of signals;

comparing said scaled signal strengths with a record of signal strengths of wireless access points at given locations; and

determining a location of the mobile communication device based on said comparing.

17. The computing device of claim 16, further comprising a memory for storing said record of signal strengths.

18. The computing device of claim 16, wherein said processing unit is further enabled to operate a neural network for said comparing said scaled signal strengths with said record of signal strengths and for said determining said location of the mobile communication device based on said comparing.

19. The computing device of claim 16, wherein said processing unit is further enabled for processing at least one survey data set received from a mobile survey device, the at least one survey data set comprising:

strengths of survey signals, said survey signals comprising signals received at said mobile survey device from said plurality of wireless access points during a signal survey;

identifiers of wireless access points which originated each said survey signal; and

at least one location of said mobile survey device when said survey signals were received; and

wherein said processing unit is further enabled for processing said at least one survey data set to produce said record of signal strengths of wireless access points at given locations.

20. The computing device of claim 16, wherein said communications interface is further enabled for providing said location to at least one of a presence engine and a PBX for providing at least one of a location based service and a location based feature.