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ViFi operates with stock 802.11 clients, and can be implemented entirely as a software add-on for commodity 802.11 APs.<\/jats:p>\n          <jats:p>ViFi puts users (customers) of different operators in separate groups, each creating a virtual WLAN. ViFi guarantees proportional fair share of channel access time at group level, and isolates traffic between groups. The key technical contribution of ViFi is a useful form of virtualization without requiring changes to the underlying WiFi protocol.<\/jats:p>","DOI":"10.1145\/2721896.2721905","type":"journal-article","created":{"date-parts":[[2015,1,16]],"date-time":"2015-01-16T14:29:58Z","timestamp":1421418598000},"page":"41-48","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":9,"title":["ViFi"],"prefix":"10.1145","volume":"18","author":[{"given":"Katherine","family":"Guo","sequence":"first","affiliation":[{"name":"Bell Laboratories, Murray Hill, New Jersey, U.S.A."}]},{"given":"Shruti","family":"Sanadhya","sequence":"additional","affiliation":[{"name":"HP Laboratories, Palo Alto, CA, U.S.A."}]},{"given":"Thomas","family":"Woo","sequence":"additional","affiliation":[{"name":"Bell Laboratories, Murray Hill, New Jersey, U.S.A."}]}],"member":"320","published-online":{"date-parts":[[2015,1,13]]},"reference":[{"unstructured":"\"Telcordia White Paper on MVNOs howpublished=\"www.telcordia.com\/library\/whitepapers\/mvno mvne.jsp\".  \"Telcordia White Paper on MVNOs howpublished=\"www.telcordia.com\/library\/whitepapers\/mvno mvne.jsp\".","key":"e_1_2_1_1_1"},{"doi-asserted-by":"publisher","key":"e_1_2_1_2_1","DOI":"10.1145\/1859995.1860023"},{"year":"2005","author":"Leith D.","journal-title":"Comm. 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