%A Ngoc Son Duong %A Thi Thai Mai Dinh %J TELKOMNIKA Telecommunication, Computing, Electronics and Control %T Smartphone Indoor Positioning Based on Enhanced BLE Beacon Multi-lateration %X In this paper, we introduce a smartphone indoor positioning method using Bluetooth Low Energy (BLE) beacon multilateration. At first, based on signal strength analysis, we construct a distance calculation model for BLE beacons. Then, with the aims to improve positioning accuracy, we propose an improved Lateral method (Range-based method) which is applied for 4 nearby beacons. The method is intended to design a real-time system for some services such as emergency assistance, personal localization and tracking, location-based advertising and marketing, etc. Experimental results show that the proposed method achieves high accuracy when compared with the state of the art lateral methods such as geometry-based (conventional trilateration), Least Square Estimation-based (LSE-based) and weighted LSE-based. %P 53-64 %D 2021 %I Institute of Advanced Engineering and Science %L SisLab4506