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System and method to obtain calibration data using estimation techniques

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System and method to obtain calibration data using estimation techniques


A system and method of determining calibration data at non-calibrated location points is disclosed. A mobile station may be geo-located at most locations, if not all locations, within communication range of one or more serving and/or neighboring base stations of a mobile network. Calibration data may be collected and stored in memory via a data collection procedure. Known calibration data for locations proximate to the mobile station may be necessary when attempting to geo-locate the mobile station. A geographical region may be calibrated via a standard calibration data collection procedure, however, various obstacles, such as, buildings, mountains, ponds etc. may inevitably create deficiencies in the calibration data for one or more areas of the region. Certain techniques may be applied to estimate the calibration data of areas that have not been properly calibrated.
Related Terms: Base Station Calibration Graph Mobile Network

Browse recent Andrew, LLC patents - Hickory, NC, US
Inventors: Martin Alles, John Carlson, George Maher, Selcuk Mazlum
USPTO Applicaton #: #20130012230 - Class: 4554561 (USPTO) - 01/10/13 - Class 455 
Telecommunications > Radiotelephone System >Zoned Or Cellular Telephone System >Location Monitoring

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The Patent Description & Claims data below is from USPTO Patent Application 20130012230, System and method to obtain calibration data using estimation techniques.

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CROSS REFERENCES

The present application claims priority benefit of U.S. application Ser. No. 12/026,364 entitled “System and Method to Obtain Calibration Data Using Estimation Techniques” filed 5 Feb. 2008 which itself claims priority benefit of U.S. Provisional Application No. 60/899,379 entitled “Mobile Location Using Network Measurement Reports” filed on 5 Feb. 2007, each of which is hereby incorporated herein by reference in its entirety.

BACKGROUND

The use of wireless communication devices such as telephones, pagers, personal digital assistants, laptop computers, etc., hereinafter referred to collectively as “mobile appliances” or “mobiles stations” has become prevalent in today\'s society. In recent years, at the urging of public safety groups, there has been increased interest in technology which can determine the geographic position or “geo-locate” a mobile station in certain circumstances.

Determining the location of a mobile station may require one or more types of calibration data associated with the mobile station (e.g., signal strength, round trip time, time difference of arrival (TDOA), etc.). Calibration data is typically collected in an outdoor environment. The primary reason for collecting calibration data outdoors is the greater ease of collecting data via automated calibration collection procedures or via manual collection procedures along roads. It is time-consuming to perform calibration procedures at geographical locations that are likely to include mobile stations but are not accessible by roads, such as, indoor locations, pathways, parks, etc.

Intentionally avoiding calibration data collection procedures in areas that are not accessible by motorized vehicles would simplify the calibration data collection procedure. If, however, there is any probability that a mobile station is likely to be located in these non-calibrated areas, then failing to obtain certain calibration data may be detrimental to locating the mobile station.

Obtaining calibration data in areas that are not accessible by vehicles and/or other types of automated data collection devices without performing manual calibration procedures would increase productivity and reduce associated costs.

One embodiment of the present subject matter is a method to determine calibration data at a candidate location by determining the candidate location in the non-calibrated sub-region to measure calibration data and obtaining calibration data for a previously calibrated geographical region within communication range of the candidate location. The method may further determine a function to represent at least a portion of the calibration data of the calibrated geographical region, and estimate the calibration data at the candidate location based on the function.

Another embodiment of the present subject matter is a method to determine calibration data at a candidate location by determining the candidate location in the non-calibrated sub-region to measure calibration data and determining a varying power function of signal power received from at least one neighboring base station to represent calibration data of at least a portion of a calibrated geographical region adjacent to the non-calibrated region. The method may further estimate the calibration data at the candidate location based on the function.

Another embodiment of the present subject matter is a method to determine calibration data at a candidate location by determining the candidate location in the non-calibrated sub-region to measure calibration data and determining a varying power function of signal powers received from a plurality of neighboring base stations to represent calibration data of at least a portion of a calibrated geographical region adjacent to the non-calibrated sub-region. The method may further determine at least one lowest signal power level of the plurality of signal power levels received, omit the signal power of the base station that transmitted the lowest signal power level from the varying power function, and estimate the calibration data at the candidate location based on the function.

Yet another embodiment of the present subject matter is a method to determine calibration data at a candidate location by determining the candidate location in the non-calibrated sub-region to measure calibration data and providing calibration data for a calibrated geographical region within communication range of the candidate location. The method may also determine a first function to represent at least a first portion of the calibration data of the calibrated geographical region, determine a second function to represent at least a second portion of the calibration data of the calibrated geographical region, where the second portion may be different from the first portion, and estimate the calibration data at the candidate location based on the first and second functions.

Still yet another embodiment of the present subject matter is a method to implement a system to determine calibration data in a non-calibrated sub-region including a calibration data collection device to collect and store calibration data within a first portion of a geographical region. A computing device may then locate a candidate location within a non-calibrated portion of the region, select a previously calibrated geographical region within communication range of the candidate location, determine a function to represent at least a portion of the calibration data of the calibrated geographical region, and estimate the calibration data at the candidate location based on the function.

These and other advantages of the disclosed subject matter over the prior art will be readily apparent to one skilled in the art to which the disclosure pertains from a perusal of the claims, the appended drawings, and the following detailed description of the preferred embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an exemplary calibration data collection system.

FIG. 2 illustrates an exemplary region having calibrated and non-calibrated areas.

FIG. 3 illustrates an exemplary graph of signal power over distance.

FIG. 4 illustrates another exemplary graph of signal power over distance.

FIG. 5 illustrates a flow diagram according to an exemplary embodiment.

FIG. 6 illustrates a flow diagram according to another exemplary embodiment.

FIG. 7 illustrates a flow diagram according to yet another exemplary embodiment.

FIG. 8 illustrates a flow diagram according to still yet another exemplary embodiment.



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stats Patent Info
Application #
US 20130012230 A1
Publish Date
01/10/2013
Document #
13612271
File Date
09/12/2012
USPTO Class
4554561
Other USPTO Classes
International Class
04W24/00
Drawings
8


Base Station
Calibration
Graph
Mobile Network


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