David C. Wyld et al. (Eds) : NETCOM, NCS, WiMoNe, CSEIT, SPM - 2015 pp. 173–181, 2015. © CS & IT-CSCP 2015 DOI : 10.5121/csit.2015.51614          Joonghong Park 1 , Jaehoon Kim 2 and Sungwon Kang 3 1 Samsung Electronics, Suwon, Republic of Korea joonghong.park@samsung.com 2 Samsung Electronics, Suwon, Republic of Korea jaehoonk@samsung.com 3 Korea Advanced of Science and Technology (KAIST), Daejeon, Republic of Korea sungwon.kang@kaist.ac.kr ABSTRACT Nowadays the use of smart mobile devices and the accompanying needs for emerging services relying on indoor location-based services (LBS) for mobile devices are rapidly increasing. For more accurate location tracking using Bluetooth Low Energy (BLE), this paper proposes a novel trilateration-based algorithm and presents experimental results that demonstrate its effectiveness. KEYWORDS Indoor location tracking, Indoor positioning, Distance-based filtering algorithm, Trilateration algorithm, Location-based services (LBS) 1. INTRODUCTION Nowadays the use of smart mobile devices, such as smartphones, has increased explosively and the needs for emerging services relying on indoor location-based services (LBS) for mobile devices are also rapidly increasing. For indoor location tracking, WiFi has been used most widely. Recently, the Bluetooth technology has introduced an energy efficient Bluetooth Low Energy (BLE) version [1]. Because of its lower transmitter power usage and its simpler receiver architecture without any sophisticated techniques for dealing with multipath such as MIMO or RAKE, BLE has been found to be a more suitable technology for indoor location tracking with respect to both accuracy and energy efficiency [2]. For computing distances, the BLE AP just broadcasts a short packet periodically with an advertising interval. After receiving this short packet, the BLE receiver can compute an approximate distance by comparing the Received Signal Strength Indication (RSSI) and the