ENVIRONMENT ANALYSIS SYSTEM AND METHOD FOR INDOOR WIRELESS LOCATION

• US 20100322077A1
• Filed: 12/29/2006
• Published: 12/23/2010
• Est. Priority Date: 11/07/2006
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Park, Jong-Hyun, Choi, Wan Sik, Kim, Byung Doo, Cho, Seong Yun, Cho, Young-su
• Application Number:
  US12/446,349
• Publication Number:
  US 20100322077A1
• Time in Patent Office: Days
• US Class Current: 370/241
• CPC Class Codes: G01S 5/021 Calibration, monitoring or correction G01S5/0252 takes precedence
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04W 16/20 for indoor coverage or short range network deployment
• CPC Class Codes: H04W 16/225 for indoor or short range network
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

An environment analysis system for indoor wireless location by using locations of a plurality of access points (AP) includes, a first environment analysis tool (10) for receiving indoor environment information for indoor wireless location, performing a simulation for calculating location accuracies, performing a simulation for relocating and/or additionally installing the access points (AP), and displaying results of the simulation; and a second environment analysis tool (20) for receiving wireless communications signals from the access points (AP), calculating distances from the second environment analysis tool (20) to the access points (AP), calculating a location of the second environment analysis tool (20), calculating errors in the distances and in the location calculated, and providing the errors calculated to the first environment analysis tool (10). The first environment analysis tool (10) corrects errors in the simulations performed thereby by using the errors received from the second environment analysis tool (20), and then repeats the simulations and the displaying process.

Claims

1. An environment analysis system for indoor wireless location by using locations of a plurality of access points, the system comprising:

a first environment analysis tool for receiving indoor environment information containing location information of the access points for indoor wireless location, performing a simulation for calculating location accuracies for all locations in the entire indoor area under conditions of the indoor environment information received, performing a simulation for relocating and/or additionally installing the access points according to the location accuracies calculated, and displaying results of the simulations; and

a second environment analysis tool for receiving wireless communications signals from the access points, calculating distances from the second environment analysis tool to the access points by using the wireless communications signals received, calculating a location of the second environment analysis tool by using the distances calculated, calculating errors in the distances and in the location calculated by comparing them with actual values thereof, and providing the errors calculated to the first environment analysis tool, wherein the first environment analysis tool corrects errors in the simulations performed thereby by using the errors received from the second environment analysis tool, and then repeats the simulations and the displaying process.

2. The environment analysis system of claim 1, wherein the first environment analysis tool includes,

an indoor environment information input unit for receiving indoor environment information for indoor wireless location;

an indoor location environment simulator for performing the simulation for calculating the location accuracies for all locations in the entire indoor area under conditions of the indoor environment information received;

an AP relocation/additional installation simulator for performing the simulation for relocating and/or additionally installing the access points according to the location accuracies calculated; and

a display unit for displaying the results of the simulations.

3. The environment analysis system of claim 2, wherein the indoor environment information input unit receives the indoor environment information including indoor map information, indoor wall information, location information of the access points, transmit power information of the access points, and movement information of a person.

4. The environment analysis system of claim 2, wherein the indoor location environment simulator includes,

a unit for calculating the location accuracies for all locations in the entire indoor area under conditions of the indoor environment information;

a unit for calculating percentage of area, at which the location accuracies satisfy reliability of a specific value, in the entire indoor area; and

a unit for providing a digital map image on which error contour lines are drawn to the display unit, wherein each error contour line is a line connecting locations at which location errors have an identical value.

5. The environment analysis system of claim 1, wherein the second environment analysis tool includes,

a wireless communications receiver for receiving the wireless communications signals from the access points;

and

a processor for calculating the distances from the second environment analysis tool to the access points, the location of the second environment analysis tool, and the errors in the distances and in the location calculated.

6. An environment analysis method for indoor wireless location by using locations of a plurality of access points, the method comprising the steps of:

receiving indoor environment information for indoor wireless location;

performing a simulation for calculating location accuracies for all locations in the entire indoor area under conditions of the indoor environment information received;

performing a simulation for relocating and/or additionally installing the access points according to the location accuracies calculated;

displaying simulation results;

calculating distances from a modem to the access points and a location of the modem by using wireless communications signals received therethrough from the access points;

calculating errors in the distances and in the location calculated by comparing them with actual values thereof; and

correcting errors in the simulations by using the errors calculated.

7. The environment analysis method of claim 6, wherein the step for performing a simulation for calculating location accuracies for all locations in the entire indoor area includes a step for providing a digital map image on which error contour lines are drawn to the display unit, wherein each error contour line is a line connecting locations at which location errors have an identical value.