{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T04:29:49Z","timestamp":1772252989291,"version":"3.50.1"},"reference-count":25,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2018,10,9]],"date-time":"2018-10-09T00:00:00Z","timestamp":1539043200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002460","name":"Chung-Ang University","doi-asserted-by":"publisher","award":["2018"],"award-info":[{"award-number":["2018"]}],"id":[{"id":"10.13039\/501100002460","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The increasing use of Internet of Things (IoT) devices in specific areas results in an interference among them and the quality of communications can be severely degraded. To deal with this interference issue, the IEEE 802.11ax standard has been established in hyper-dense wireless networking systems. The 802.11ax adopts a new candidate technology that is called multiple network allocation vector in order to mitigate the interference problem. In this paper, we point out a potential problem in multiple network allocation vector which can cause delays to communication among IoT devices in hyper-dense wireless networks. Furthermore, this paper introduces an adaptive beam alignment algorithm for interference resolution, and analyzes the potential delays of communications among IoT devices under interference conditions. Finally, we simulate our proposed algorithm in densely deployed environments and show that the interference can be mitigated and the IEEE 802.11ax-based IoT devices can utilize air interface more fairly compared to conventional IEEE 802.11 distributed coordination function.<\/jats:p>","DOI":"10.3390\/s18103364","type":"journal-article","created":{"date-parts":[[2018,10,9]],"date-time":"2018-10-09T11:10:44Z","timestamp":1539083444000},"page":"3364","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Interference-Aware Adaptive Beam Alignment for Hyper-Dense IEEE 802.11ax Internet-of-Things Networks"],"prefix":"10.3390","volume":"18","author":[{"given":"Dohyun","family":"Kwon","sequence":"first","affiliation":[{"name":"School of Computer Science and Engineering, Chung-Ang University, Seoul 06974, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sang-Wook","family":"Kim","sequence":"additional","affiliation":[{"name":"School of Computer Science and Engineering, Chung-Ang University, Seoul 06974, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1794-6076","authenticated-orcid":false,"given":"Joongheon","family":"Kim","sequence":"additional","affiliation":[{"name":"School of Computer Science and Engineering, Chung-Ang University, Seoul 06974, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aziz","family":"Mohaisen","sequence":"additional","affiliation":[{"name":"Department of Computer Science, University of Central Florida, Orlando, FL 32816, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2018,10,9]]},"reference":[{"key":"ref_1","unstructured":"(2018, July 25). Cisco Visual Networking Index: Forecast and Methodology 2016\u20132021. Available online: https:\/\/www.cisco.com\/c\/en\/us\/solutions\/collateral\/service-provider\/visual-networking-index-vni\/complete-white-paper-c11-481360.html."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"130","DOI":"10.1109\/MWC.2016.1600089WC","article-title":"IEEE 802.11ax: Challenges and Requirements for Future High Efficiency WiFi","volume":"24","author":"Afaqui","year":"2017","journal-title":"IEEE Wirel. Commun."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Khorov, E., Kiryanov, A., and Lyakhov, A. (2015, January 18\u201319). IEEE 802.11ax: How to Build High Efficiency WLANs. Proceedings of the IEEE Engineering and Telecommunication (EnT), Moscow, Russia.","DOI":"10.1109\/EnT.2015.23"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"2315","DOI":"10.1109\/COMST.2016.2554098","article-title":"A Survey on High Efficiency Wireless Local Area Networks: Next Generation WiFi","volume":"18","author":"Omar","year":"2016","journal-title":"IEEE Commun. Surv. Tutor."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"38","DOI":"10.1109\/MWC.2016.7422404","article-title":"IEEE 802.11ax: High-Efficiency WLANs","volume":"23","author":"Bellalta","year":"2016","journal-title":"IEEE Wirel. Commun."},{"key":"ref_6","unstructured":"Bellalta, B., and Kosek-Szott, K. (arXiv, 2017). AP-initiated Multi-User Transmissions in IEEE 802.11ax WLANs, arXiv."},{"key":"ref_7","first-page":"48","article-title":"Advanced Wireless LAN Technologies: IEEE 802.11AC and Beyond","volume":"Volume 18","author":"Gong","year":"2014","journal-title":"ACM GetMobile: Mobile Computing and Communications"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Li, B., Qu, Q., Yan, Z., and Yang, M. (2015, January 9\u201312). Survey on OFDMA based MAC Protocols for the Next Generation WLAN. Proceedings of the IEEE Wireless Communications and Networking Conference Workshop (WCNC WKSHPS), Istanbul, Turkey.","DOI":"10.1109\/WCNCW.2015.7122542"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Qu, Q., Li, B., Yang, M., and Yan, Z. (2015, January 9\u201312). An OFDMA based Concurrent Multiuser MAC for Upcoming IEEE 802.11ax. Proceedings of the IEEE Wireless Communications and Networking Conference Workshop (WCNC WKSHPS), Istanbul, Turkey.","DOI":"10.1109\/WCNCW.2015.7122543"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Afaqui, M.S., Villegas, E.G., and Lopez-Aguilera, E. (2016, January 3\u20136). Dynamic Sensitivity Control Algorithm Leveraging Adaptive RTS\/CTS for IEEE 802.11ax. Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC), Doha, Qatar.","DOI":"10.1109\/WCNC.2016.7565005"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Afaqui, M.S., Garcia-Villegas, E., Lopez-Aguilera, E., Smith, G., and Camps, D. (2015, January 9\u201312). Evaluation of Dynamic Sensitivity Control Algorithm for IEEE 802.11ax. Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC), Istanbul, Turkey.","DOI":"10.1109\/WCNC.2015.7127616"},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Lin, W., Li, B., Yang, M., Qu, Q., Yan, Z., Zuo, X., and Yang, B. (2016, January 4\u20138). Integrated Link-System Level Simulation Platform for the Next Generation WLAN-IEEE 802.11ax. Proceedings of the IEEE Global Communications Conference (GLOBECOM), Washington, DC, USA.","DOI":"10.1109\/GLOCOM.2016.7841905"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"6086","DOI":"10.1109\/ACCESS.2016.2602281","article-title":"On Quality-of-Service Provisioning in IEEE 802.11 ax WLANs","volume":"4","author":"Deng","year":"2016","journal-title":"IEEE Access"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1109\/MWC.2017.1600400","article-title":"Vehicular Radio Access to Unlicensed Spectrum","volume":"24","author":"Lien","year":"2017","journal-title":"IEEE Wirel. Commun."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"5779","DOI":"10.1109\/TWC.2017.2715834","article-title":"On The Modeling and Analysis of Uplink and Downlink IEEE 802.11 ax Wi-Fi with LTE in Unlicensed Spectrum","volume":"16","author":"Ajami","year":"2017","journal-title":"IEEE Trans. Wirel. Commun."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Nurchis, M., and Bellalta, B. (arXiv, 2018). Target Wake Time: Scheduled access in IEEE 802.11 ax WLANs, arXiv.","DOI":"10.1109\/MWC.2019.1800163"},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Sharon, O., and Alpert, Y. (arXiv, 2018). Scheduling Strategies and Throughput Optimization for the Uplink for IEEE 802.11 ax and IEEE 802.11 ac Based Networks, arXiv.","DOI":"10.4236\/wsn.2017.98014"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Sharon, O., and Alpert, Y. (arXiv, 2018). Advanced IEEE 802.11 ax TCP aware scheduling under unreliable channels, arXiv.","DOI":"10.1002\/dac.4060"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"15332","DOI":"10.1109\/ACCESS.2017.2733083","article-title":"A Semi-Matching Based Load Balancing Scheme for Dense IEEE 802.11 WLANs","volume":"5","author":"Lei","year":"2017","journal-title":"IEEE Access"},{"key":"ref_20","unstructured":"Aijaz, A., and Kulkarni, P. Simultaneous Transmit and Receive Operation in Next Generation IEEE 802.11 WLANs: A MAC Protocol Design Approach, arXiv."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"4176","DOI":"10.1109\/TWC.2009.080816","article-title":"Generalized CSMA\/CA for OFDMA Systems: Protocol Design, Throughput Analysis, and Implementation Issues","volume":"8","author":"Kwon","year":"2009","journal-title":"IEEE Trans. Wirel. Commun."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1552","DOI":"10.1109\/TWC.2010.05.090464","article-title":"Opportunistic Multi-Channel CSMA Protocol for OFDMA Systems","volume":"9","author":"Kwon","year":"2010","journal-title":"IEEE Trans. Wirel. Commun."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Lou, H., Wang, X., Fang, J., Ghosh, M., Zhang, G., and Olesen, R. (2014, January 10\u201314). Multi-User Parallel Channel Access for High Efficiency Carrier Grade Wireless LANs. Proceedings of the IEEE International Conference on Communications (ICC), Sydney, NSW, Australia.","DOI":"10.1109\/ICC.2014.6883924"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"648","DOI":"10.1109\/TWC.2011.122211.102316","article-title":"Group Contention-Based OFDMA MAC Protocol for Multiple Access Interference-Free in WLAN Systems","volume":"11","author":"Jung","year":"2012","journal-title":"IEEE Trans. Wirel. Commun."},{"key":"ref_25","unstructured":"Jain, R.K., Chiu, D.M.W., and Hawe, W.R. (2018, July 25). A Quantitative Measure of Fairness and Discrimination for Resource Allocation. Available online: https:\/\/www.researchgate.net\/profile\/Raj_Jain3\/publication\/220486705_A_Quantitative_Measure_Of_Fairness_And_Discrimination_For_Resource_Allocation_In_Shared_Computer_Systems\/links\/09e4150c0274cec7b2000000.pdf."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/10\/3364\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T15:24:29Z","timestamp":1760196269000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/10\/3364"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,10,9]]},"references-count":25,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2018,10]]}},"alternative-id":["s18103364"],"URL":"https:\/\/doi.org\/10.3390\/s18103364","relation":{"has-preprint":[{"id-type":"doi","id":"10.20944\/preprints201808.0263.v1","asserted-by":"object"}]},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2018,10,9]]}}}