Indoor location inference based on mobile network
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Indoor Location Inference based on mobile network. Term project proposal – 1 조 20020034 권요셉 , 20020133 김태욱 5 조 20020021 고우균 , 20020124 김진우. Contents. Motivation Project Scenario Technical Problem Detailed Methodology Expected Result Issue Reference. Motivation.

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Indoor location inference based on mobile network

Indoor Location Inference based on mobile network

Term project proposal –

1조 20020034 권요셉, 20020133 김태욱

5조 20020021 고우균, 20020124 김진우


Contents
Contents

  • Motivation

  • Project Scenario

  • Technical Problem

  • Detailed Methodology

  • Expected Result

  • Issue

  • Reference


Motivation
Motivation

  • Wireless 환경이 차츰 대중화 되고 있으므로, GPS로 위치 추적이 되지 않는 건물 안에서, wireless LAN을 사용할 수 있는 mobile device의 location을 알아내고자 한다.


Project scenario

AP1

AP2

Where isMYO?

MYO

AP3

JINU

…calculating…

MYO is there!!

Project Scenario


Technical problem
Technical Problem

  • How to measure the distance between AP and mobile device?

    • signal의 strength의 비 또는 packet의 arrival time으로 구한다.

    • 모바일 장치(혹은 AP)간의 간섭 현상으로 인해 오차가 발생할 수 있다.


Detailed methodology 1 2
Detailed Methodology(1/2)

  • 필요 장비

    • Laptop(Averatec) 4대

    • Laptop(Averatec) 3대를 랜 케이블로 연결(wired)

  • 실험 장소

    • 기숙사와 같이 다른 AP가 잡히지 않는 곳

      • 간섭 현상을 없애기 위해

  • 실험

    • Signal Strength측정(wireless extension API)

    • 패킷의 TOA 측정

    • AP의 MAC address identify

    • Location의 정확도 측정


Detailed methodology 2 2

AP1

AP2

AP3

Laptop

-averatec-

measure

Detailed Methodology(2/2)


Expected result
Expected result

  • Signal strength measurement로 distance를 파악한다(RADAR).

    • Ad-hoc 모드에서도 distance measurement.

    • Signal Strength로 알아낼 수 있는 거리의 오차는 2m~3m 정도가 될 것이다.

    • Mobile device의 이동 방향이나 속도 등도 파악 가능하다.


Issue
Issue

  • Distance 측정 방법에서

    • TOA vs signal strength

    • Ad-hoc vs Infrastructure


Reference
Reference

  • P.Bahl, V. Pdmnabhan, “RADAR: An In-building RF-based User Location and Tracking System”, In Proc. IEEE INFOCOM, March 2000.

  • P. Bahl, V. N. Padmanabhan, and A. Balachandran, Enhancements to the RADAR User Location and Tracking System, Microsoft Research Technical Report: MSR-TR-00-12, February 2000

  • S. Capkun, M. Hamdi, J.P. Hubaux, GPS-Free Positioning in Mobile ad-hoc Networks, In Proceedings of Hawaii Int. Conf. on System Sciences (HICSS), January 2001

  • John Krumm and Eric Horvitz, “LOCADIO: Inferring Motion and Location from Wi-Fi Signal Strengths” Microsoft Research, Microsoft Corporation , One Microsoft Way , Redmond, WA USA ,Proceedings of Mobiquitous 2004, First Annual International Conference on Mobile and Ubiquitous Systems: Networking and Services, pp. 4-14. August 22-26, 2004, Boston, MA, USA