UJALoc-BLE-NLOS: Real-World BLE Dataset for Indoor Localization under NLOS Conditions Abstract This dataset contains Received Signal Strength Indicator (RSSI) measurements collected from 8 Bluetooth Low Energy (BLE) beacons distributed within a conventional multi-room dwelling. The data is designed to support research in indoor localization, fingerprinting techniques, and signal propagation modeling under real-world Non-Line-of-Sight (NLOS) conditions. It includes measurements from 28 distinct reference points, providing a comprehensive mapping of the radio frequency environment in a realistic residential scenario with obstacles, walls, and multipath effects. Dataset Structure Measurement files: p1.csv - p28.csv: Individual files corresponding to each measurement point (1 to 28). Each file contains raw RSSI captures from all detectable beacons at that specific location. plane.pdf: A detailed floor plan showing the physical coordinates/locations of the 8 beacons and the 28 measurement points. Each record in the CSV files follows this structure: mac: Physical MAC address of the detected BLE beacon. time: Unix timestamp (milliseconds) of the measurement. dato: Received Signal Strength Indicator (RSSI) value in dBm. Hardware and Configuration The setup consists of 8 BLE beacons with varying transmission power (TX Power) settings to provide diverse signal characteristics for modeling. The specific hardware devices and their configuration are described in detail in Díaz-Jiménez, D., López Ruiz, J. L., Cuevas-Martínez, J. C., Torres-Sospedra, J., Navarro, E. A., & Espinilla Estévez, M. (2025). BLE-Based Custom Devices for Indoor Positioning in Ambient Assisted Living Systems: Design and Prototyping. Sensors, 25(20), 6499. https://doi.org/10.3390/s25206499. MAC Address Beacon ID Power (dBm) Advertising Channel Samples F2:34:2D:BE:43:1E 1 -4 37 and 38 4,019 C6:8C:6E:50:1C:66 2 -4 37 and 38 2,896 CA:FA:83:43:90:6A 3 4 37 and 38 4,136 F2:7C:81:CB:BB:5B 4 8 37 and 38 4,267 C5:C1:22:55:5A:69 5 4 37 and 38 4,090 CB:F4:EA:1D:3F:31 6 4 37 and 38 4,177 DB:36:66:4B:BD:C4 7 4 37 and 38 4,176 EC:0F:79:C9:CB:8A 8 4 37 and 38 4,217 Total dataset volume: 31,978 samples. Data was collected by placing a receiving device at each of the 28 points marked on the map. At each point, the receiver captured advertising packets from all beacons for a fixed duration, capturing the temporal variance of the RSSI signal. License and Citation This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0). If you use this dataset in your research, please cite it as: UJALoc-BLE-NLOS: Real-World BLE Dataset for Indoor Localization under NLOS Conditions Note: For further details on the spatial distribution, please refer to the included 'plane.pdf'. Acknowledgements This dataset has been partially supported by grant PDC2023-145863-I00 funded by MICIU/AEI/10.13039/501100011033, and by "European Union NextGenerationEU/PRTR".