適地性服務近年逐漸被受重視，它是利用移動營運商的無線電通訊網路或室外定位方式獲取使用者的位置，因此應用領域廣泛，其中最常使用的是GPS系統，但因其訊號須直視性才能傳遞資料，所以無法應用於室內定位。微基地台(Femtocell)是小型的室內基地台，不僅能提升室內的訊號強度，也提供無線網路的使用，其功能的便利性適合應用於室內定位方面。本論文的目的為利用微基地台與三角定位演算法進行室內定位，利用訊號強度與距離的關係作位置的估算，並用不同型式的實驗設置來考慮精度的提升。 本文證實微基地台可應用在室內定位，因此未來也可應用在其它設備手機或平板電腦來提供LBS的服務。

Location-based service (LBS) has been noticed recently. The GPS is usually utilized for LBS, but it needs the line of sight to transfer the data. Thus it is hard to be used for indoor positioning. Femtocell is a small, indoor base station in telecommunication. It is used to enhance the strength of signal and provide the function of wireless. It is suitable to applied in indoor positioning due to it is convenient. In this study, it uses the femtocell with algorithm of triangulation to implement the indoor positioning and takes the strength of signal to estimate the location by the relationship of the strength of signal and distance. Set different modes of setting to improve the accuracy of positioning. In this experiment, it proved the femtocell can be applied to the indoor positioning. For positioning by using femtocell, it can be applied combine to another portable device such as smart phone or tablet personal computer to provide the positioning service in future.

[1] D. Niculescu, B. Nath, “Ad Hoc Positioning System (APS) using AOA”, IEEE INFOCOM, Vol. 3, March30-April 3, 2003, pp. 1734-1743.
[2] R. Peng, M. L. Sichitiu, “Angle of Arrival Localization for Wireless Sensor Networks”, IEEE SECON, Vol. 1, September 28, 2006, pp. 374-382.
[3] Y. Zhao, “Standardization of Mobile Phone Positioning for 3G Systems”, IEEE Communications Magazine, Vol. 40, No. 7, July 2002, pp. 108-116.
[4] F. Gustafsson, F. Gunnarsson, “Positioning using Time Difference of Arrival Measurements”, Proceedings of IEEE Acoustics, Vol. 6, April 6-10, 2003, pp. VI – 553-6 vol.6.
[5] T. Locher, R. Wattenhofer, A. Zollinger, “Received-Signal-Strength Based Logical Positioning Resilient to Signal Fluctuation”, IEEE SNPD/SAWN Sixth Conference, May 23-25, 2005, pp. 396-402.
[6] P. Bahl, V. N. Padmanabhan, “RADAR: An In-Building RF-based User Location and Tracking System”, Proceedings - IEEE INFOCOM, Vol. 2, 2000, pp. 775-784.
[7] M. N. Borenovic, A. M. Neskovic, “Comparative Analysis of RSSI, SNR and Noise Level Parameters Applicability for WLAN Positioning Purposes”, IEEE EUROCN, May 18-23, 2009, pp. 1895-1900.
[8] K. Z. Lin, “Application of Wireless Sensor Network Modules in Indoor Geolocation”, Master Thesis, Department of Electrical Engineering, National Cheng Kung University, 2007.
[9] C. E. Lin, C. C. Li, T. C. Lu, J. Y. Lai, “A Mobile Station Positioning Algorithm using Forced Handover”, Journal of Aeronautics, Astronautics and Aviation, Series A, Vol. 39, No. 1, March 2007, pp. 037-048.
[10] C. E. Lin, H. R. Chiou, D. L. Sheu, “Indoor Positioning using GSM Received Signal Strength”, Journal of Aeronautics, Astronautics and Aviation, Series A, Vol. 44, No. 3, 2012, pp. 159-167.
[11] M. K, Hasan, R. A Saeed, A. Abdalla, S. Islam, O. Mahmoud, O. Khalifah, S. A. Hameed, A. F. Ismail, “An Investigation of Femtocell Network Synchronization”, IEEE Conference on Open Systems (ICOS), September25-28, 2011, pp. 196 - 201.
[12] V. Khaitan, M. Yavuz , “Indoor Positioning using Femtocells”, IEEE Vehicular Technology Conference, September 5-8, 2011, pp. 1- 5.
[13] W. K. Tam, V. N. Tran, “Propagation Modeling for Indoor Wireless Communication,” IEEE Transactions on Electronics and Communication, Vol. 7, Issue 5, 1995, pp. 221-228.
[14] R. Olsen, D. Rogers, D. Hodge, “The aRb Relation in the Calculation of Rain Attenuation,” IEEE Transactions on Antennas and Propagation, Vol. 26, Issue 2, March 1978, pp. 318-329.
[15] Y. H. Qi, H. Suda, H. Kobayashi, “On Time-of-Arrival Positioning in a Multipath Environment,” IEEE Vehicular Technology Conference, Vol. 5, September 26-29, 2004, pp. 3540- 3544.
[16] B. H. Liu, B. Otis, S. Challa, P. Axon, C. T. Chou, S. Jha, “ On the Fading and Shadowing Effects for Wireless Sensor Networks,” IEEE International Conference on Mobile Ad-hoc and Sensor Systems, October 2006, pp. 51-60.
[17] A. Goldsmith, Wireless Communications, Cambridge University Press, 2005.
[18] Y. P. Wang, X. Yang, Y. T. Zhao, Y. Liu, L. Cuthbert, “A Bluetooth positioning using RSSI and triangulation methods”, IEEE Consumer Communications and Networking Conference, January11-14, 2013, pp. 837 - 842.
[19] FCP2110 Femtocell Feature List from Askey Corp., available from website: http://www.askey.com.tw