Indoor Location Inference based on mobile network -Term project proposal – -1 조 20020034 권요셉, 20020133 김태욱 -5 조 20020021 고우균, 20020124 김진우.

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Indoor Location Inference based on mobile network -Term project proposal – -1 조 권요셉, 김태욱 -5 조 고우균, 김진우

[ ] Contents  Motivation  Project Scenario  Technical Problem  Detailed Methodology  Expected Result  Issue  Reference

[ ] Motivation  Wireless 환경이 차츰 대중화 되고 있으므로, GPS 로 위치 추적이 되지 않는 건물 안에서, wireless LAN 을 사용할 수 있는 mobile device 의 location 을 알아내고자 한다.

[ ] Project Scenario AP1AP3AP2 MYO JINU Where is MYO ? …calculating…MYO is there!!

[ ] Technical Problem  How to measure the distance between AP and mobile device?  signal 의 strength 의 비 또는 packet 의 arrival time 으로 구한다.  모바일 장치 ( 혹은 AP) 간의 간섭 현상으로 인해 오차가 발생할 수 있다.

[ ] Detailed Methodology(1/2)  필요 장비  Laptop(Averatec) 4 대  Laptop(Averatec) 3 대를 랜 케이블로 연결 (wired)  실험 장소  기숙사와 같이 다른 AP 가 잡히지 않는 곳  간섭 현상을 없애기 위해  실험  Signal Strength 측정 (wireless extension API)  패킷의 TOA 측정  AP 의 MAC address identify  Location 의 정확도 측정

[ ] Detailed Methodology(2/2) measure AP1 AP2 AP3 Laptop -averatec-

[ ] Expected result  Signal strength measurement 로 distance 를 파악 한다 (RADAR).  Ad-hoc 모드에서도 distance measurement.  Signal Strength 로 알아낼 수 있는 거리의 오차는 2m~3m 정도가 될 것이다.  Mobile device 의 이동 방향이나 속도 등도 파악 가능하 다.

[ ] Issue  Distance 측정 방법에서  TOA vs signal strength  Ad-hoc vs Infrastructure

[ ] Reference  P.Bahl, V. Pdmnabhan, “RADAR: An In-building RF-based User Location and Tracking System”, In Proc. IEEE INFOCOM, March  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 August 22-26, 2004, Boston, MA, USA