{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:37:30Z","timestamp":1760243850127,"version":"build-2065373602"},"reference-count":18,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2011,10,13]],"date-time":"2011-10-13T00:00:00Z","timestamp":1318464000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>We introduce both the coexistence zone within the WiMAX frame structure and a PS-Request protocol for the coexistence of WiFi and WiMAX systems sharing a frequency band. Because we know that the PS-Request protocol has drawbacks, we propose a revised PS-Request protocol to improve the performance. Two PS-Request protocols are based on the time division operation (TDO) of WiFi system and WiMAX system to avoid the mutual interference, and use the vestigial power management (PwrMgt) bit within the Frame Control field of the frames transmitted by a WiFi AP. The performance of the revised PS-Request protocol is evaluated by computer simulation, and compared to those of the cases without a coexistence protocol and to the original PS-Request protocol.<\/jats:p>","DOI":"10.3390\/s111009700","type":"journal-article","created":{"date-parts":[[2011,10,13]],"date-time":"2011-10-13T10:21:59Z","timestamp":1318501319000},"page":"9700-9716","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Coexistence of WiFi and WiMAX Systems Based on PS-Request Protocols"],"prefix":"10.3390","volume":"11","author":[{"given":"Jongwoo","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Electronics and Communications Engineering, Kwangwoon University, Seoul 139-701, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Suwon","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Electronics and Communications Engineering, Kwangwoon University, Seoul 139-701, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seung Hyong","family":"Rhee","sequence":"additional","affiliation":[{"name":"Department of Electronics Convergence Engineering, Kwangwoon University, Seoul 139 701, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yong-Hoon","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of Information Control Engineering, Kwangwoon University, Seoul 139-701, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Young-uk","family":"Chung","sequence":"additional","affiliation":[{"name":"Department of Electronic Engineering, Kwangwoon University, Seoul 139-701, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ho Young","family":"Hwang","sequence":"additional","affiliation":[{"name":"Department of Computer Engineering, Kwangwoon University, Seoul 139-701, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2011,10,13]]},"reference":[{"key":"ref_1","unstructured":"Chiasserini, CF, and Rao, RR (, January June). 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Delft, The Netherland."},{"key":"ref_6","unstructured":"Kim, D, Kim, J, Park, S, Rhee, SH, Kang, C, Han, K, and Kang, H (, January June). Circulator-based collocated system for coexistence of WiFi and WiMAX systems in shared bands. Hong Kong."},{"key":"ref_7","unstructured":"Berlemann, L, Hoymann, C, Hiertz, GR, and Mangold, S (, January May). Coexistence and interworking of IEEE 802.16 and IEEE 802.11(e). Melbourne, Australia."},{"key":"ref_8","unstructured":"Berlemann, L, Hoymann, C, Hiertz, GR, and Walke, B (, January September). Unlicensed operation of IEEE 802.16: Coexistence with 802.11(a) in shared frequency bands. Helsinki, Finland."},{"key":"ref_9","unstructured":"Siddique, MM, Wenning, BL, and Muehleisen, M (, January June). Spectrum sharing between IEEE 802.16 and IEEE 802.11 based wireless networks. Montreal, QC, Canada."},{"key":"ref_10","unstructured":"Jing, X, and Raychaudhuri, D (, January November). 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Energy Efficient Coexistence of WiFi and WiMAX Systems Sharing Frequency Band, Springer.","DOI":"10.1007\/978-3-642-17569-5_18"},{"key":"ref_15","unstructured":"Kim, J, Park, S, Choi, H-Y, and Rhee, SH (, January August). Performance of WiFi system due to interference from WiMAX system in a shared frequency band. Xi\u2019an, China."},{"key":"ref_16","unstructured":"IEEE Std 80211\u2122-2007 (2007). IEEE Standard for Local and Metropolitan Area Networks-Specific Requirements, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, IEEE Computer Society."},{"key":"ref_17","unstructured":"IEEE Std 80216\u2122-2004 (2004). IEEE Standard for Local and Metropolitan Area Networks-Part 16: Air Interface for Fixed Broadband Wireless Access Systems, IEEE Computer Society."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1781","DOI":"10.1587\/transcom.E94.B.1781","article-title":"Coexistence of WiFi and WiMAX systems based on coexistence zone within WiMAX frame structure and modified power saving mode of WiFi system","volume":"E94-B","author":"Kim","year":"2011","journal-title":"IEICE Trans Commun"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/11\/10\/9700\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T21:57:40Z","timestamp":1760219860000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/11\/10\/9700"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2011,10,13]]},"references-count":18,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2011,10]]}},"alternative-id":["s111009700"],"URL":"https:\/\/doi.org\/10.3390\/s111009700","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2011,10,13]]}}}