{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T18:52:38Z","timestamp":1775069558014,"version":"3.50.1"},"reference-count":98,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2021,8,16]],"date-time":"2021-08-16T00:00:00Z","timestamp":1629072000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Future Internet"],"abstract":"<jats:p>With exponential growth in the deployment of Internet of Things (IoT) devices, many new innovative and real-life applications are being developed. IoT supports such applications with the help of resource-constrained fixed as well as mobile nodes. These nodes can be placed in anything from vehicles to the human body to smart homes to smart factories. Mobility of the nodes enhances the network coverage and connectivity. One of the crucial requirements in IoT systems is the accurate and fast localization of its nodes with high energy efficiency and low cost. The localization process has several challenges. These challenges keep changing depending on the location and movement of nodes such as outdoor, indoor, with or without obstacles and so on. The performance of localization techniques greatly depends on the scenarios and conditions from which the nodes are traversing. Precise localization of nodes is very much required in many unique applications. Although several localization techniques and algorithms are available, there are still many challenges for the precise and efficient localization of the nodes. This paper classifies and discusses various state-of-the-art techniques proposed for IoT node localization in detail. It includes the different approaches such as centralized, distributed, iterative, ranged based, range free, device-based, device-free and their subtypes. Furthermore, the different performance metrics that can be used for localization, comparison of the different techniques, some prominent applications in smart cities and future directions are also covered.<\/jats:p>","DOI":"10.3390\/fi13080210","type":"journal-article","created":{"date-parts":[[2021,8,16]],"date-time":"2021-08-16T21:27:45Z","timestamp":1629149265000},"page":"210","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":66,"title":["Survey of Localization for Internet of Things Nodes: Approaches, Challenges and Open Issues"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3799-2878","authenticated-orcid":false,"given":"Sheetal","family":"Ghorpade","sequence":"first","affiliation":[{"name":"RMD Sinhgad School of Engineering, Savitribai Phule Pune University, Pune 411058, India"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0578-0830","authenticated-orcid":false,"given":"Marco","family":"Zennaro","sequence":"additional","affiliation":[{"name":"Science, Technology and Innovation Unit, International Centre for Theoretical Physics, 34151 Trieste, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2401-8996","authenticated-orcid":false,"given":"Bharat","family":"Chaudhari","sequence":"additional","affiliation":[{"name":"School of Electronics and Communication Engineering, MIT World Peace University, Pune 411037, India"}]}],"member":"1968","published-online":{"date-parts":[[2021,8,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2836","DOI":"10.1109\/COMST.2017.2703620","article-title":"Localization and Positioning Systems for Emergency Responders: A Survey","volume":"19","author":"Ferreira","year":"2017","journal-title":"IEEE Commun. Surv. Tutor."},{"key":"ref_2","first-page":"4","article-title":"Review on Localization Techniques in Wireless Sensor Networks","volume":"116","author":"Kaur","year":"2015","journal-title":"Int. J. Comput. Appl."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Shakir, Z., Zec, J., and Kostanic, I. (2018, January 9\u201310). Position Location Based on Measurement Reports in LTE Cellular Networks. Proceedings of the 2018 IEEE 19th Wireless and Microwave Technology Conference (WAMICON), Sand Key, FL, USA.","DOI":"10.1109\/WAMICON.2018.8363501"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"2537","DOI":"10.1007\/s11276-015-1116-8","article-title":"An Analytical Geometric Range Free Localization Scheme Based on Mobile Beacon Points in Wireless Sensor Network","volume":"22","author":"Singh","year":"2016","journal-title":"Wirel. Netw."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"956","DOI":"10.1109\/TWC.2010.03.090706","article-title":"Mobile Element Assisted Cooperative Localization for Wireless Sensor Networks with Obstacles","volume":"9","author":"Chen","year":"2010","journal-title":"IEEE Trans. Wirel. Commun."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1186\/s13638-018-1037-1","article-title":"A Monte Carlo Localization Method Based on Differential Evolution Optimization Applied into Economic Forecasting in Mobile Wireless Sensor Networks","volume":"2018","author":"Qin","year":"2018","journal-title":"J. Wirel. Commun. Netw."},{"key":"ref_7","unstructured":"Ji, X., and Zha, H. (2004, January 7\u201311). Sensor Positioning in Wireless Ad-Hoc Sensor Networks Using Multidimensional Scaling. Proceedings of the IEEE Infocom 2004, Hong Kong, China."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"145","DOI":"10.1049\/iet-wss.2019.0163","article-title":"Wireless Sensor Nodes Localiser Based on Sine\u2013Cosine Algorithm","volume":"10","author":"Hamouda","year":"2020","journal-title":"IET Wirel. Sens. Syst."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"2522","DOI":"10.1109\/TCOMM.2013.032013.120381","article-title":"TDOA Based Positioning in the Presence of Unknown Clock Skew","volume":"61","author":"Gholami","year":"2013","journal-title":"IEEE Trans. Commun."},{"key":"ref_10","first-page":"1","article-title":"Heuristic Localization Algorithm with a Novel Error Control Mechanism for Wireless Sensor Networks with Few Anchor Nodes","volume":"2018","author":"Sun","year":"2018","journal-title":"J. Sens."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"650","DOI":"10.3923\/jse.2015.650.657","article-title":"Improved DV-Hop Positioning Algorithm Based on Compensation Coefficient","volume":"9","author":"Fang","year":"2015","journal-title":"J. Softw. Eng."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Gui, L., Val, T., and Wei, A. (2011, January 5\u20138). Improving Localization Accuracy Using Selective 3-Anchor DV-Hop Algorithm. Proceedings of the 2011 IEEE Vehicular Technology Conference (VTC Fall), San Francisco, CA, USA.","DOI":"10.1109\/VETECF.2011.6093011"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Wang, J., Hou, A., and Tu, Y. (2019, January 17\u201319). An Improved Dv-Hop Localization Algorithm Based on Centroid Multilateration. Proceedings of the ACM Turing Celebration Conference\u2014China, Chengdu, China.","DOI":"10.1145\/3321408.3326658"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Paul, A., and Sato, T. (2017). Localization in Wireless Sensor Networks: A Survey on Algorithms, Measurement Techniques, Applications and Challenges. J. Sens. Actuator Netw., 6.","DOI":"10.3390\/jsan6040024"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Tan, F. (2020). The Algorithms of Distributed Learning and Distributed Estimation about Intelligent Wireless Sensor Network. Sensors, 20.","DOI":"10.3390\/s20051302"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"4219","DOI":"10.1016\/j.aej.2018.11.008","article-title":"Recent Achievements in Sensor Localization Algorithms","volume":"57","author":"Saad","year":"2018","journal-title":"Alex. Eng. J."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"2841","DOI":"10.1007\/s11277-020-07506-9","article-title":"Linear Wireless Sensor Networks Energy Minimization Using Optimal Placement Strategies of Nodes","volume":"114","author":"Hussein","year":"2020","journal-title":"Wirel. Pers. Commun"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"103944","DOI":"10.1016\/j.imavis.2020.103944","article-title":"Viewpoint Constrained and Unconstrained Cricket Stroke Localization from Untrimmed Videos","volume":"100","author":"Gupta","year":"2020","journal-title":"Image Vis. Comput."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Stocker, M., Groswindhager, B., Boano, C.A., and Romer, K. (2020, January 10\u201313). Towards Secure and Scalable UWB-Based Positioning Systems. Proceedings of the 2020 IEEE 17th International Conference on Mobile Ad Hoc and Sensor Systems (MASS), Delhi, India.","DOI":"10.1109\/MASS50613.2020.00039"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.pmcj.2015.10.016","article-title":"Indoor Localization with Audible Sound\u2014Towards Practical Implementation","volume":"29","author":"Moutinho","year":"2016","journal-title":"Pervasive Mob. Comput."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"e7","DOI":"10.1002\/spy2.7","article-title":"An Effective Bat Algorithm for Node Localization in Distributed Wireless Sensor Network","volume":"1","author":"Mihoubi","year":"2018","journal-title":"Secur. Priv."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"93831","DOI":"10.1109\/ACCESS.2021.3093113","article-title":"Enhanced Differential Crossover and Quantum Particle Swarm Optimization for IoT Applications","volume":"9","author":"Ghorpade","year":"2021","journal-title":"IEEE Access"},{"key":"ref_23","first-page":"452","article-title":"Fundamental Metrics for Wireless Sensor Networks Localization","volume":"2","author":"Rezazadeh","year":"2012","journal-title":"Int. J. Electr. Comput. Eng."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Dardari, D., Decarli, N., Guerra, A., and Guidi, F. (2016, January 2\u20135). The Future of Ultra-Wideband Localization in RFID. Proceedings of the 2016 IEEE International Conference on RFID (RFID), Orlando, FL, USA.","DOI":"10.1109\/RFID.2016.7487998"},{"key":"ref_25","unstructured":"Wang, Y., Xiong, H., Argamon, S., Li, X., and Li, J. (2015, January 1\u20133). Parallel Accurate Localization from Cellular Network. Proceedings of the Big Data Computing and Communications, Taiyuan, China."},{"key":"ref_26","first-page":"1","article-title":"Hybrid Data Fusion and Tracking for Positioning with GNSS and 3GPP-LTE","volume":"2010","author":"Mensing","year":"2010","journal-title":"Int. J. Navig. Obs."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"215","DOI":"10.1186\/1687-1499-2014-215","article-title":"Hybrid Positioning Data Fusion in Heterogeneous Networks with Critical Hearability","volume":"2014","author":"Yassine","year":"2014","journal-title":"J. Wirel. Commun. Netw."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Rana, S.P., Dey, M., Siddiqui, H.U., Tiberi, G., Ghavami, M., and Dudley, S. (2017, January 12\u201315). UWB Localization Employing Supervised Learning Method. Proceedings of the 2017 IEEE 17th International Conference on Ubiquitous Wireless Broadband (ICUWB), Salamanca, Spain.","DOI":"10.1109\/ICUWB.2017.8250971"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1504\/IJSNET.2021.113632","article-title":"Towards Green Computing: Intelligent Bio-Inspired Agent for IoT-Enabled Wireless Sensor Networks","volume":"35","author":"Ghorpade","year":"2021","journal-title":"Int. J. Sens. Netw."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1285","DOI":"10.1007\/s11276-016-1227-x","article-title":"Mobile Beacon Based Range Free Localization Method for Wireless Sensor Networks","volume":"23","author":"Singh","year":"2017","journal-title":"Wirel. Netw."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1004","DOI":"10.1109\/TII.2017.2786782","article-title":"Nature Inspired Methods and Their Industry Applications\u2014Swarm Intelligence Algorithms","volume":"14","author":"Slowik","year":"2018","journal-title":"IEEE Trans. Ind. Inf."},{"key":"ref_32","unstructured":"Xie, S., Hu, Y., and Wang, Y. (2014, January 9\u201313). Weighted Centroid Localization Algorithm Based on Least Square for Wireless Sensor Networks. Proceedings of the 2014 IEEE International Conference on Consumer Electronics\u2014China, Shenzhen, China."},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Messous, S., Liouane, H., Cheikhrouhou, O., and Hamam, H. (2021). Improved Recursive DV-Hop Localization Algorithm with RSSI Measurement for Wireless Sensor Networks. Sensors, 21.","DOI":"10.3390\/s21124152"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"218","DOI":"10.1186\/s13638-019-1539-5","article-title":"Research of Localization Algorithm for Wireless Sensor Network Based on DV-Hop","volume":"2019","author":"Xue","year":"2019","journal-title":"J. Wirel. Commun. Netw."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Zeng, F., Li, W., and Guo, X. (2018, January 25\u201327). An Improved DV-Hop Localization Algorithm Based on Average Hop and Node Distance Optimization. Proceedings of the 2018 2nd IEEE Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC), Xi\u2019an, China.","DOI":"10.1109\/IMCEC.2018.8469655"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"7333","DOI":"10.1007\/s11227-020-03166-5","article-title":"Deployment Techniques in Wireless Sensor Networks: A Survey, Classification, Challenges, and Future Research Issues","volume":"76","author":"Priyadarshi","year":"2020","journal-title":"J. Supercomput."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1592","DOI":"10.1109\/TMC.2010.129","article-title":"Multihop Range-Free Localization in Anisotropic Wireless Sensor Networks: A Pattern-Driven Scheme","volume":"9","author":"Xiao","year":"2010","journal-title":"IEEE Trans. Mob. Comput."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"3886","DOI":"10.1109\/TCOMM.2016.2590436","article-title":"Accurate Range-Free Localization in Multi-Hop Wireless Sensor Networks","volume":"64","author":"Zaidi","year":"2016","journal-title":"IEEE Trans. Commun."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"394","DOI":"10.1007\/s11802-019-3724-x","article-title":"A Localization Algorithm Using a Mobile Anchor Node Based on Region Determination in Underwater Wireless Sensor Networks","volume":"18","author":"Xu","year":"2019","journal-title":"J. Ocean Univ. China"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"219371","DOI":"10.1155\/2014\/219371","article-title":"A Mobile Anchor Assisted Localization Algorithm Based on Regular Hexagon in Wireless Sensor Networks","volume":"2014","author":"Han","year":"2014","journal-title":"Sci. World J."},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Singh, P., Khosla, A., Kumar, A., and Khosla, M. (2017, January 12\u201314). Optimized Localization by Mobile Anchors in Wireless Sensor Network by Particle Swarm Optimization. Proceedings of the 2017 International Conference on Computing and Communication Technologies for Smart Nation (IC3TSN), Gurgaon, India.","DOI":"10.1109\/IC3TSN.2017.8284493"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"5350","DOI":"10.1109\/JSEN.2017.2725343","article-title":"Geometric Constraint-Based Range-Free Localization Scheme for Wireless Sensor Networks","volume":"17","author":"Singh","year":"2017","journal-title":"IEEE Sens. J."},{"key":"ref_43","unstructured":"Li, K., Fei, M., Jia, L., and Irwin, G.W. (2010, January 17\u201320). Research on APIT and Monte Carlo Method of Localization Algorithm for Wireless Sensor Networks. Proceedings of the Life System Modeling and Intelligent Computing, Wuxi, China."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"534","DOI":"10.1007\/s11036-014-0517-8","article-title":"Locating in Crowdsourcing-Based DataSpace: Wireless Indoor Localization without Special Devices","volume":"19","author":"Chen","year":"2014","journal-title":"Mob. Netw. Appl."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"429104","DOI":"10.1155\/2015\/429104","article-title":"Indoor Mobile Localization Based on Wi-Fi Fingerprint\u2019s Important Access Point","volume":"11","author":"Jiang","year":"2015","journal-title":"Int. J. Distrib. Sens. Netw."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"118","DOI":"10.1016\/j.pmcj.2015.02.001","article-title":"Autonomous Smartphone-Based Wi-Fi Positioning System by Using Access Points Localization and Crowdsourcing","volume":"18","author":"Zhuang","year":"2015","journal-title":"Pervasive Mob. Comput."},{"key":"ref_47","doi-asserted-by":"crossref","unstructured":"Li, W.W.-L., Iltis, R.A., and Win, M.Z. (2013, January 9\u201313). A Smartphone Localization Algorithm Using RSSI and Inertial Sensor Measurement Fusion. Proceedings of the 2013 IEEE Global Communications Conference (GLOBECOM), Atlanta, GA, USA.","DOI":"10.1109\/GLOCOM.2013.6831587"},{"key":"ref_48","unstructured":"Estel, M., and Fischer, L. (2015). Feasibility of Bluetooth Ibeacons for Indoor Localization, Gesellschaft f\u00fcr Informatik e.V."},{"key":"ref_49","first-page":"2083094","article-title":"Improving Indoor Localization Using Bluetooth Low Energy Beacons","volume":"2016","author":"Kriz","year":"2016","journal-title":"Mob. Inf. Syst."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"169","DOI":"10.1016\/j.agwat.2016.10.022","article-title":"Platform for the Management of Hydraulic Chambers Based on Mobile Devices and Bluetooth Low-Energy Motes","volume":"183","author":"Molina","year":"2017","journal-title":"Agric. Water Manag."},{"key":"ref_51","doi-asserted-by":"crossref","unstructured":"Werner, M., Kessel, M., and Marouane, C. (2011, January 21\u201323). Indoor Positioning Using Smartphone Camera. Proceedings of the 2011 International Conference on Indoor Positioning and Indoor Navigation, Guimaraes, Portugal.","DOI":"10.1109\/IPIN.2011.6071954"},{"key":"ref_52","doi-asserted-by":"crossref","unstructured":"Chen, W., Wang, W., Li, Q., Chang, Q., and Hou, H. (2016). A Crowd-Sourcing Indoor Localization Algorithm via Optical Camera on a Smartphone Assisted by Wi-Fi Fingerprint RSSI. Sensors, 16.","DOI":"10.3390\/s16030410"},{"key":"ref_53","doi-asserted-by":"crossref","unstructured":"Xia, Y., Xiu, C., and Yang, D. (2018, January 22\u201323). Visual Indoor Positioning Method Using Image Database. Proceedings of the 2018 Ubiquitous Positioning, Indoor Navigation and Location-Based Services (UPINLBS), Wuhan, China.","DOI":"10.1109\/UPINLBS.2018.8559714"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"29","DOI":"10.1016\/j.pmcj.2014.09.003","article-title":"Accurate Smartphone Indoor Positioning Using a WSN Infrastructure and Non-Invasive Audio for TDoA Estimation","volume":"20","author":"Lopes","year":"2015","journal-title":"Pervasive Mob. Comput."},{"key":"ref_55","doi-asserted-by":"crossref","unstructured":"Liu, K., Liu, X., Xie, L., and Li, X. (2013, January 14\u201319). Towards Accurate Acoustic Localization on a Smartphone. Proceedings of the 2013 IEEE Infocom, Turin, Italy.","DOI":"10.1109\/INFCOM.2013.6566822"},{"key":"ref_56","doi-asserted-by":"crossref","unstructured":"Yan, W., Jing, Z., and Nailong, Z. (2015, January 24\u201326). The Designing of Indoor Localization System Based on Self-Organized WSN Using Pulson UWB Sensors. Proceedings of the 2015 2nd International Conference on Information Science and Control Engineering, Shanghai, China.","DOI":"10.1109\/ICISCE.2015.218"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"340","DOI":"10.1016\/j.dsp.2012.07.012","article-title":"Compressive Sensing Based Sub-Mm Accuracy UWB Positioning Systems: A Space\u2013Time Approach","volume":"23","author":"Yang","year":"2013","journal-title":"Digit. Signal Process."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"1961","DOI":"10.1109\/TIE.2010.2055774","article-title":"A Standalone RFID Indoor Positioning System Using Passive Tags","volume":"58","author":"Saab","year":"2011","journal-title":"IEEE Trans. Ind. Electron."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"384","DOI":"10.1016\/j.future.2016.03.017","article-title":"Tag Localization in a Two-Dimensional RFID Tag Matrix","volume":"76","author":"Son","year":"2017","journal-title":"Future Gener. Comput. Syst."},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"2120","DOI":"10.1109\/JSEN.2017.2664338","article-title":"An Indoor Multi-Tag Cooperative Localization Algorithm Based on NMDS for RFID","volume":"17","author":"Gao","year":"2017","journal-title":"IEEE Sens. J."},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"216","DOI":"10.1016\/j.infrared.2017.06.007","article-title":"Multiple Human Location in a Distributed Binary Pyroelectric Infrared Sensor Network","volume":"85","author":"Yang","year":"2017","journal-title":"Infrared Phys. Technol."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"550","DOI":"10.1109\/THMS.2014.2365466","article-title":"Multiperson Locating and Their Soft Tracking in a Binary Infrared Sensor Network","volume":"45","author":"Tao","year":"2015","journal-title":"IEEE Trans. Hum. Mach. Syst."},{"key":"ref_63","doi-asserted-by":"crossref","unstructured":"De Miguel-Bilbao, S., Rold\u00e1n, J., Garc\u00eda, J., L\u00f3pez, F., Garc\u00eda-Sagredo, P., and Ramos, V. (2013, January 9\u201312). Comparative Analysis of Indoor Location Technologies for Monitoring of Elderly. Proceedings of the 2013 IEEE 15th International Conference on E-Health Networking, Applications and Services (Healthcom 2013), Lisbon, Portugal.","DOI":"10.1109\/HealthCom.2013.6720693"},{"key":"ref_64","doi-asserted-by":"crossref","unstructured":"Lim, J., and Park, H.-M. (2020). Tracking by Risky Particle Filtering over Sensor Networks. Sensors, 20.","DOI":"10.3390\/s20113109"},{"key":"ref_65","doi-asserted-by":"crossref","unstructured":"Ali, H., and Choi, J. (2019). A Review of Underground Pipeline Leakage and Sinkhole Monitoring Methods Based on Wireless Sensor Networking. Sustainability, 11.","DOI":"10.3390\/su11154007"},{"key":"ref_66","doi-asserted-by":"crossref","unstructured":"Lee, N., Ahn, S., and Han, D. (2018). AMID: Accurate Magnetic Indoor Localization Using Deep Learning. Sensors, 18.","DOI":"10.3390\/s18051598"},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"1729881417711643","DOI":"10.1177\/1729881417711643","article-title":"An Indoor Mobile Robot Navigation Technique Using Odometry and Electronic Compass","volume":"14","author":"Chen","year":"2017","journal-title":"Int. J. Adv. Robot. Syst."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"9","DOI":"10.1109\/TMTT.2009.2035945","article-title":"Real-Time Noncoherent UWB Positioning Radar With Millimeter Range Accuracy: Theory and Experiment","volume":"58","author":"Zhang","year":"2010","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_69","doi-asserted-by":"crossref","unstructured":"Sobhani, B., Mazzotti, M., Paolini, E., Giorgetti, A., and Chiani, M. (2013, January 15\u201318). Effect of State Space Partitioning on Bayesian Tracking for UWB Radar Sensor Networks. Proceedings of the 2013 IEEE International Conference on Ultra-Wideband (ICUWB), Sydney, Australia.","DOI":"10.1109\/ICUWB.2013.6663833"},{"key":"ref_70","doi-asserted-by":"crossref","unstructured":"Yang, L., Lin, Q., Li, X., Liu, T., and Liu, Y. (2015, January 7\u201311). See Through Walls with COTS RFID System!. Proceedings of the 21st Annual International Conference on Mobile Computing and Networking, Paris, France.","DOI":"10.1145\/2789168.2790100"},{"key":"ref_71","doi-asserted-by":"crossref","unstructured":"Wagner, B., and Timmermann, D. (2013, January 28\u201331). Approaches for Device-Free Multi-User Localization with Passive RFID. Proceedings of the International Conference on Indoor Positioning and Indoor Navigation, Montbeliard, France.","DOI":"10.1109\/IPIN.2013.6851521"},{"key":"ref_72","doi-asserted-by":"crossref","unstructured":"Ruan, W., Sheng, Q.Z., Yao, L., Gu, T., Ruta, M., and Shangguan, L. (2016, January 21\u201324). Device-Free Indoor Localization and Tracking through Human-Object Interactions. Proceedings of the 2016 IEEE 17th International Symposium on A World of Wireless, Mobile and Multimedia Networks (WoWMoM), Coimbra, Portugal.","DOI":"10.1109\/WoWMoM.2016.7523524"},{"key":"ref_73","doi-asserted-by":"crossref","unstructured":"Gong, L., Yang, W., Xiang, C., Man, D., Yu, M., and Yin, Z. (2016, January 23\u201326). WiSal: Ubiquitous WiFi-Based Device-Free Passive Subarea Localization without Intensive Site-Survey. Proceedings of the 2016 IEEE Trustcom\/BigDataSE\/ISPA, Tianjin, China.","DOI":"10.1109\/TrustCom.2016.0185"},{"key":"ref_74","doi-asserted-by":"crossref","unstructured":"Xiao, J., Wu, K., Yi, Y., Wang, L., and Ni, L.M. (2013, January 8\u201311). Pilot: Passive Device-Free Indoor Localization Using Channel State Information. Proceedings of the 2013 IEEE 33rd International Conference on Distributed Computing Systems, Philadelphia, PA, USA.","DOI":"10.1109\/ICDCS.2013.49"},{"key":"ref_75","doi-asserted-by":"crossref","first-page":"54","DOI":"10.1109\/MPRV.2017.30","article-title":"Beyond Data in the Smart City: Repurposing Existing Campus IoT","volume":"16","author":"Bates","year":"2017","journal-title":"IEEE Pervasive Comput."},{"key":"ref_76","doi-asserted-by":"crossref","unstructured":"\u010celan, V., Stan\u010di\u0107, I., and Musi\u0107, J. (2016, January 13\u201315). Cleaning up Smart Cities\u2014Localization of Semi-Autonomous Floor Scrubber. Proceedings of the 2016 International Multidisciplinary Conference on Computer and Energy Science (SpliTech), Split, Croatia.","DOI":"10.1109\/SpliTech.2016.7555931"},{"key":"ref_77","doi-asserted-by":"crossref","unstructured":"Holenderski, M., Verhoeven, R., Ozcelebi, T., and Lukkien, J.J. (2014, January 16\u201319). Light Pole Localization in a Smart City. Proceedings of the 2014 IEEE Emerging Technology and Factory Automation (ETFA), Barcelona, Spain.","DOI":"10.1109\/ETFA.2014.7005300"},{"key":"ref_78","doi-asserted-by":"crossref","first-page":"653","DOI":"10.1007\/s13349-020-00411-6","article-title":"Towards Smart Cities: Crowdsensing-Based Monitoring of Transportation Infrastructure Using in-Traffic Vehicles","volume":"10","author":"Mei","year":"2020","journal-title":"J. Civ. Struct. Health Monit."},{"key":"ref_79","doi-asserted-by":"crossref","unstructured":"Kim, K., Li, S., Heydariaan, M., Smaoui, N., Gnawali, O., Suh, W., Suh, M.J., and Kim, J.I. (2021). Feasibility of LoRa for Smart Home Indoor Localization. Appl. Sci., 11.","DOI":"10.3390\/app11010415"},{"key":"ref_80","doi-asserted-by":"crossref","first-page":"27","DOI":"10.1007\/s11276-016-1309-9","article-title":"SALA: Smartphone-Assisted Localization Algorithm for Positioning Indoor IoT Devices","volume":"24","author":"Jeong","year":"2018","journal-title":"Wirel. Netw."},{"key":"ref_81","doi-asserted-by":"crossref","first-page":"624","DOI":"10.1109\/JIOT.2017.2712560","article-title":"Semisupervised Deep Reinforcement Learning in Support of IoT and Smart City Services","volume":"5","author":"Mohammadi","year":"2018","journal-title":"IEEE Internet Things J."},{"key":"ref_82","doi-asserted-by":"crossref","unstructured":"Yang, Q., He, Z., Zhao, K., and Gao, T. (2016, January 12\u201314). A Time Localization System in Smart Home Using Hierarchical Structure and Dynamic Frequency. Proceedings of the 2016 IEEE 18th International Conference on High Performance Computing and Communications; IEEE 14th International Conference on Smart City; IEEE 2nd International Conference on Data Science and Systems (HPCC\/SmartCity\/DSS), Sydney, Australia.","DOI":"10.1109\/HPCC-SmartCity-DSS.2016.0120"},{"key":"ref_83","doi-asserted-by":"crossref","first-page":"1450","DOI":"10.1109\/ACCESS.2015.2441694","article-title":"Energy-Efficient Indoor Localization of Smart Hand-Held Devices Using Bluetooth","volume":"3","author":"Gu","year":"2015","journal-title":"IEEE Access"},{"key":"ref_84","doi-asserted-by":"crossref","unstructured":"Chen, K.-W., Tsai, H.-M., Hsieh, C.-H., Lin, S.-D., Wang, C.-C., Yang, S.-W., Chien, S.-Y., Lee, C.-H., Su, Y.-C., and Chou, C.-T. (2014, January 6\u20138). Connected Vehicle Safety Science, System, and Framework. Proceedings of the 2014 IEEE World Forum on Internet of Things (WF-IoT), Seoul, Korea.","DOI":"10.1109\/WF-IoT.2014.6803165"},{"key":"ref_85","doi-asserted-by":"crossref","unstructured":"Karbab, E., Djenouri, D., Boulkaboul, S., and Bagula, A. (2015, January 21\u201323). Car Park Management with Networked Wireless Sensors and Active RFID. Proceedings of the 2015 IEEE International Conference on Electro\/Information Technology (EIT), Dekalb, IL, USA.","DOI":"10.1109\/EIT.2015.7293372"},{"key":"ref_86","doi-asserted-by":"crossref","first-page":"1217","DOI":"10.1109\/TITS.2020.2964604","article-title":"GWO Model for Optimal Localization of IoT-Enabled Sensor Nodes in Smart Parking Systems","volume":"22","author":"Ghorpade","year":"2021","journal-title":"IEEE Trans. Intell. Transp. Syst."},{"key":"ref_87","doi-asserted-by":"crossref","first-page":"769","DOI":"10.1007\/s10586-017-0764-0","article-title":"Recognizing Individuals in Groups in Outdoor Environments Combining Stereo Vision, RFID and BLE","volume":"20","author":"Llorca","year":"2017","journal-title":"Clust. Comput."},{"key":"ref_88","doi-asserted-by":"crossref","first-page":"22372","DOI":"10.3390\/s141222372","article-title":"A Cloud-Based Car Parking Middleware for IoT-Based Smart Cities: Design and Implementation","volume":"14","author":"Ji","year":"2014","journal-title":"Sensors"},{"key":"ref_89","unstructured":"Ha, Y.-G., and Byun, Y.-C. (June, January 30). A Ubiquitous Homecare Service System Using a Wearable User Interface Device. Proceedings of the 2012 IEEE\/ACIS 11th International Conference on Computer and Information Science, Shanghai, China."},{"key":"ref_90","doi-asserted-by":"crossref","first-page":"62","DOI":"10.1016\/j.glohj.2019.07.001","article-title":"Smart healthcare: Making medical care more intelligent","volume":"3","author":"Tian","year":"2019","journal-title":"Glob. Health J."},{"key":"ref_91","first-page":"217286","article-title":"Implementation of Fall Detection and Localized Caring System","volume":"2013","author":"Chen","year":"2013","journal-title":"Math. Probl. Eng."},{"key":"ref_92","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1109\/TCE.2016.7514671","article-title":"An Outdoor Intelligent Healthcare Monitoring Device for the Elderly","volume":"62","author":"Wang","year":"2016","journal-title":"IEEE Trans. Consum. Electron."},{"key":"ref_93","doi-asserted-by":"crossref","first-page":"115500","DOI":"10.1016\/j.eswa.2021.115500","article-title":"IoT based Hybrid Optimized Fuzzy Threshold ELM Model for Localization of Elderly Persons","volume":"184","author":"Ghorpade","year":"2021","journal-title":"J. Expert Syst. Appl."},{"key":"ref_94","unstructured":"Chaudhari, B.S., and Zennaro, M. (2020). LPWAN Technologies for IoT and M2M Applications, Elsevier. [1st ed.]."},{"key":"ref_95","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1016\/j.comnet.2015.11.012","article-title":"Human Localization Based on Inertial Sensors and Fingerprints in the Industrial Internet of Things","volume":"101","author":"Lin","year":"2016","journal-title":"Comput. Netw."},{"key":"ref_96","doi-asserted-by":"crossref","first-page":"236","DOI":"10.1109\/JIOT.2016.2646375","article-title":"A Data-Oriented M2M Messaging Mechanism for Industrial IoT Applications","volume":"4","author":"Meng","year":"2017","journal-title":"IEEE Internet Things J."},{"key":"ref_97","doi-asserted-by":"crossref","first-page":"333","DOI":"10.1049\/iet-wss.2018.5169","article-title":"Binary Grey Wolf Optimisation-based Topology Control for WSNs","volume":"9","author":"Ghorpade","year":"2019","journal-title":"IET Wirel. Sens. Syst."},{"key":"ref_98","first-page":"1529","article-title":"Three-Dimensional Distance-Error-Correction-Based Hop Localization Algorithm for IoT Devices","volume":"66","author":"Prashar","year":"2021","journal-title":"Comput. Mater. Contin."}],"container-title":["Future Internet"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1999-5903\/13\/8\/210\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T06:46:51Z","timestamp":1760165211000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1999-5903\/13\/8\/210"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,8,16]]},"references-count":98,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2021,8]]}},"alternative-id":["fi13080210"],"URL":"https:\/\/doi.org\/10.3390\/fi13080210","relation":{},"ISSN":["1999-5903"],"issn-type":[{"value":"1999-5903","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,8,16]]}}}