{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,30]],"date-time":"2026-01-30T03:23:02Z","timestamp":1769743382229,"version":"3.49.0"},"reference-count":38,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2022,8,9]],"date-time":"2022-08-09T00:00:00Z","timestamp":1660003200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Institute of Information &amp; communications Technology Planning &amp; Evaluation (IITP)","award":["2021-0-00746"],"award-info":[{"award-number":["2021-0-00746"]}]},{"name":"Korea government (MSIT)","award":["2021-0-00746"],"award-info":[{"award-number":["2021-0-00746"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Several smart city ideas are introduced to manage various problems caused by overpopulation, but the futuristic smart city is a concept based on dense and artificial-intelligence-centric cities. Thus, massive device connectivity with huge data traffic is expected in the future where communication networks are expected to provide ubiquity, high quality of service, and on-demand content for a large number of interconnected devices. The sixth-generation (6G) network is considered the problem-solving network of futuristic cities, with huge bandwidth and low latency. The expected 6G of the radio access network is based on terahertz (THz) waves with the capability of carrying up to one terabit per second (Tbps). THz waves have the capability of carrying a large amount of data but these waves have several drawbacks, such as short-range and atmospheric attenuation. Hence, these problems can introduce complications and hamper the performance of the 6G network. This study envisions futuristic smart cities using 6G and proposes a conceptual terrestrial network (TN) architecture for 6G. The nested Bee Hive is a scalable multilayer architecture designed to meet the needs of futuristic smart cities. Moreover, we designed the multilayer network infrastructure while considering the expectations from a network of futuristic smart cities and the complications of THz waves. Extensive simulations are performed using different pathfinding algorithms in the 3D multilayer domain to evaluate the performance of the proposed architecture and set the dynamics of futuristic communication of 6G.<\/jats:p>","DOI":"10.3390\/s22165950","type":"journal-article","created":{"date-parts":[[2022,8,10]],"date-time":"2022-08-10T04:20:32Z","timestamp":1660105232000},"page":"5950","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Nested Bee Hive: A Conceptual Multilayer Architecture for 6G in Futuristic Sustainable Smart Cities"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4095-8868","authenticated-orcid":false,"given":"Muhammad Shoaib","family":"Farooq","sequence":"first","affiliation":[{"name":"Department of Computer Science, University of Management and Technology, Lahore 54000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rana Muhammad","family":"Nadir","sequence":"additional","affiliation":[{"name":"Department of Computer Science, University of Management and Technology, Lahore 54000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8403-1047","authenticated-orcid":false,"given":"Furqan","family":"Rustam","sequence":"additional","affiliation":[{"name":"Department of Software Engineering, School of Systems and Technology, University of Management and Technology, Lahore 54000, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Soojung","family":"Hur","sequence":"additional","affiliation":[{"name":"Department of Information and Communication Engineering, Yeungnam University, Gyeongsan-si 38541, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yongwan","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Information and Communication Engineering, Yeungnam University, Gyeongsan-si 38541, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8271-6496","authenticated-orcid":false,"given":"Imran","family":"Ashraf","sequence":"additional","affiliation":[{"name":"Department of Information and Communication Engineering, Yeungnam University, Gyeongsan-si 38541, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Lemayian, J.P., and Al-Turjman, F. (2019). Intelligent IoT communication in smart environments: An overview. Artificial Intelligence in IoT, Springer.","DOI":"10.1007\/978-3-030-04110-6_10"},{"key":"ref_2","unstructured":"United Nations Department of Economic, and Social Affairs (2018). World Urbanization Prospects: The 2018 Revision, United Nations Publications."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"70","DOI":"10.1109\/MNET.2019.1800418","article-title":"6G wireless communications: Vision and potential techniques","volume":"33","author":"Yang","year":"2019","journal-title":"IEEE Netw."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"33609","DOI":"10.1109\/ACCESS.2020.2973461","article-title":"Cyber physical and social networks in IoV (CPSN-IoV): A multimodal architecture in edge-based networks for optimal route selection using 5G technologies","volume":"8","author":"Arooj","year":"2020","journal-title":"IEEE Access"},{"key":"ref_5","unstructured":"Union, I. (2015). IMT Traffic Estimates for the Years 2020 to 2030, International Telecommunication Union. Report ITU."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"118","DOI":"10.1109\/MWC.001.1900488","article-title":"A speculative study on 6G","volume":"27","author":"Tariq","year":"2020","journal-title":"IEEE Wirel. Commun."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1109\/MVT.2019.2921162","article-title":"6G: The next frontier: From holographic messaging to artificial intelligence using subterahertz and visible light communication","volume":"14","author":"Strinati","year":"2019","journal-title":"IEEE Veh. Technol. Mag."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1109\/MVT.2019.2921208","article-title":"6G wireless networks: Vision, requirements, architecture, and key technologies","volume":"14","author":"Zhang","year":"2019","journal-title":"IEEE Veh. Technol. Mag."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"742","DOI":"10.1109\/TTHZ.2015.2443491","article-title":"Long-path THz-TDS atmospheric measurements between buildings","volume":"5","author":"Moon","year":"2015","journal-title":"IEEE Trans. Terahertz Sci. Technol."},{"key":"ref_10","first-page":"1","article-title":"6G Visions: Mobile ultra-broadband, super internet-of-things, and artificial intelligence","volume":"16","author":"Zhang","year":"2019","journal-title":"China Commun."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Alsharif, M.H., Kelechi, A.H., Albreem, M.A., Chaudhry, S.A., Zia, M.S., and Kim, S. (2020). Sixth generation (6G) wireless networks: Vision, research activities, challenges and potential solutions. Symmetry, 12.","DOI":"10.3390\/sym12040676"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"57063","DOI":"10.1109\/ACCESS.2020.2981745","article-title":"Communications in the 6G era","volume":"8","author":"Viswanathan","year":"2020","journal-title":"IEEE Access"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"957","DOI":"10.1109\/OJCOMS.2020.3010270","article-title":"6G wireless communication systems: Applications, requirements, technologies, challenges, and research directions","volume":"1","author":"Chowdhury","year":"2020","journal-title":"IEEE Open J. Commun. Soc."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"175758","DOI":"10.1109\/ACCESS.2019.2957648","article-title":"A survey on green 6G network: Architecture and technologies","volume":"7","author":"Huang","year":"2019","journal-title":"IEEE Access"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"272","DOI":"10.1109\/MNET.011.2000195","article-title":"Artificial-intelligence-enabled intelligent 6G networks","volume":"34","author":"Yang","year":"2020","journal-title":"IEEE Netw."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"126","DOI":"10.1109\/MWC.001.1900516","article-title":"6G: Opening new horizons for integration of comfort, security, and intelligence","volume":"27","author":"Gui","year":"2020","journal-title":"IEEE Wirel. Commun."},{"key":"ref_17","unstructured":"Lee, Y.L., Qin, D., Wang, L.C., and Hong, G. (2019). 6G Massive Radio Access Networks: Key Issues, Technologies, and Future Challenges. arXiv."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"78729","DOI":"10.1109\/ACCESS.2019.2921522","article-title":"Wireless communications and applications above 100 GHz: Opportunities and challenges for 6G and beyond","volume":"7","author":"Rappaport","year":"2019","journal-title":"IEEE Access"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Zubairi, J.A., Erdogan, E., and Reich, S. (2015, January 20\u201324). Experiments in fair scheduling in 4G WiMAX and LTE. Proceedings of the 2015 International Conference on High Performance Computing & Simulation (HPCS), Amsterdam, The Netherlands.","DOI":"10.1109\/HPCSim.2015.7237050"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"More, S., and Mishra, D.K. (2012, January 23\u201325). 4G revolution: WiMAX technology. Proceedings of the 2012 Third Asian Himalayas International Conference on Internet, Kathmundu, Nepal.","DOI":"10.1109\/AHICI.2012.6408433"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Sherazi, H., Iqbal, R., Gilani, A., and Chaudary, M. (2015, January 13\u201315). Energy efficient femtocell based architecture for low coverage areas in WiMAX. Proceedings of the 2015 6th International Conference on Computing, Communication and Networking Technologies (ICCCNT), Dallas-Fortworth, TX, USA.","DOI":"10.1109\/ICCCNT.2015.7395180"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"34393","DOI":"10.1109\/ACCESS.2018.2847718","article-title":"Joint RRH-association, sub-channel assignment and power allocation in multi-tier 5G C-RANs","volume":"6","author":"Ali","year":"2018","journal-title":"IEEE Access"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"3502","DOI":"10.1109\/COMST.2019.2914453","article-title":"TLS\/PKI challenges and certificate pinning techniques for IoT and M2M secure communications","volume":"21","author":"Mendoza","year":"2019","journal-title":"IEEE Commun. Surv. Tutor."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Sun, S., Rappaport, T.S., Rangan, S., Thomas, T.A., Ghosh, A., Kovacs, I.Z., Rodriguez, I., Koymen, O., Partyka, A., and Jarvelainen, J. (2016, January 15\u201318). Propagation path loss models for 5G urban micro-and macro-cellular scenarios. Proceedings of the 2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), Nanjing, China.","DOI":"10.1109\/VTCSpring.2016.7504435"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"6213","DOI":"10.1109\/TAP.2017.2734243","article-title":"Overview of millimeter wave communications for fifth-generation (5G) wireless networks\u2014With a focus on propagation models","volume":"65","author":"Rappaport","year":"2017","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_26","unstructured":"Farooq, M.S., Nadir, R.M., Rustam, F., Hur, S., Park, Y., and Ashraf, I. (2022, August 01). Algorithems-Used-in-Nested-Bee-Hive. Available online: https:\/\/github.com\/RanaMNadir\/Algorithems-used-in-Nested-Bee-Hive."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"3682","DOI":"10.1109\/COMST.2019.2916180","article-title":"Security for 5G and beyond","volume":"21","author":"Ahmad","year":"2019","journal-title":"IEEE Commun. Surv. Tutor."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"101933","DOI":"10.1016\/j.adhoc.2019.101933","article-title":"A secure communicating things network framework for industrial IoT using blockchain technology","volume":"94","author":"Rathee","year":"2019","journal-title":"Ad Hoc Netw."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"426","DOI":"10.1109\/COMST.2019.2916177","article-title":"Toward massive machine type communications in ultra-dense cellular IoT networks: Current issues and machine learning-assisted solutions","volume":"22","author":"Sharma","year":"2019","journal-title":"IEEE Commun. Surv. Tutor."},{"key":"ref_30","unstructured":"Al-Eryani, Y., and Hossain, E. (2019). Delta-OMA (D-OMA): A new method for massive multiple access in 6G. arXiv."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1463","DOI":"10.1109\/JPROC.2009.2020572","article-title":"The Atacama large millimeter\/submillimeter array","volume":"97","author":"Wootten","year":"2009","journal-title":"Proc. IEEE"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"ACL 13-1","DOI":"10.1029\/2001JD002045","article-title":"Valley floor climate observations from the McMurdo Dry Valleys, Antarctica, 1986\u20132000","volume":"107","author":"Doran","year":"2002","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"615","DOI":"10.1007\/s10762-016-0257-x","article-title":"Terabit-per-second satellite links: A path toward ubiquitous terahertz communication","volume":"37","author":"Suen","year":"2016","journal-title":"J. Infrared Millimeter Terahertz Waves"},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Hosseini, N., Jamal, H., Haque, J., Magesacher, T., and Matolak, D.W. (2019, January 2\u20139). UAV command and control, navigation and surveillance: A review of potential 5G and satellite systems. Proceedings of the 2019 IEEE Aerospace Conference, Big Sky, MT, USA.","DOI":"10.1109\/AERO.2019.8741719"},{"key":"ref_35","first-page":"180","article-title":"International Appeal: Scientists call for protection from non-ionizing electromagnetic field exposure","volume":"20","author":"Blank","year":"2015","journal-title":"Eur. J. Oncol."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"496","DOI":"10.1016\/j.envres.2018.01.037","article-title":"Report of final results regarding brain and heart tumors in Sprague-Dawley rats exposed from prenatal life until natural death to mobile phone radiofrequency field representative of a 1.8 GHz GSM base station environmental emission","volume":"165","author":"Falcioni","year":"2018","journal-title":"Environ. Res."},{"key":"ref_37","first-page":"4","article-title":"[Comment] Health risks from radiofrequency radiation, including 5G, should be assessed by experts with no conflicts of interest.","volume":"20","author":"Hardel","year":"2020","journal-title":"Oncol. Lett."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"9354","DOI":"10.1039\/C8RA10605C","article-title":"The medical application of terahertz technology in non-invasive detection of cells and tissues: Opportunities and challenges","volume":"9","author":"Yu","year":"2019","journal-title":"RSC Adv."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/16\/5950\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T00:06:14Z","timestamp":1760141174000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/16\/5950"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,8,9]]},"references-count":38,"journal-issue":{"issue":"16","published-online":{"date-parts":[[2022,8]]}},"alternative-id":["s22165950"],"URL":"https:\/\/doi.org\/10.3390\/s22165950","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,8,9]]}}}