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In this context, new challenges arise such as high\u2010capacity demand and low\u2010latency flexible backhaul connection for public safety users. In this paper, we consider a scenario in which 4G LTE radio coverage is provisioned by aerial eNodeBs installed on low\u2010altitude platforms raised in the sky and interconnected through WiFi links. We focus our attention on the critical aspect of theThird Generation Partnership Project handover mechanism studying the handover performance using a X2 interfaces over WiFi links. We develop a novel geometric model of the handover in the context of public safety communications but extensible also to other contexts. Relying on such a model, the handover failure probability is computed taking into account the different handover phases. The coverage area of an aerial eNodeB is studied using a suitable air\u2010to\u2010ground propagation model, while the average handover duration is computed taking into account the delay introduced by the WiFi communication dynamics. Copyright \u00a9 2016 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/ett.3067","type":"journal-article","created":{"date-parts":[[2016,7,18]],"date-time":"2016-07-18T02:42:48Z","timestamp":1468809768000},"source":"Crossref","is-referenced-by-count":1,"title":["A novel geometric handover model for aerial 4G networks with WiFi\u2010based X2 interface"],"prefix":"10.1002","volume":"28","author":[{"given":"Riccardo","family":"Fedrizzi","sequence":"first","affiliation":[{"name":"CREATE\u2010NET Research Centre Trento 38123 Italy"}]},{"given":"Leonardo","family":"Goratti","sequence":"additional","affiliation":[{"name":"CREATE\u2010NET Research Centre Trento 38123 Italy"}]},{"given":"Karina","family":"Gomez","sequence":"additional","affiliation":[{"name":"RMIT University Melbourne Victoria 3001 Australia"}]},{"given":"Tinku","family":"Rasheed","sequence":"additional","affiliation":[{"name":"CREATE\u2010NET Research Centre Trento 38123 Italy"}]}],"member":"311","published-online":{"date-parts":[[2016,7,17]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSAC.2014.2328098"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2014.2360555"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1109\/MCOM.2013.6461193"},{"key":"e_1_2_7_5_1","unstructured":"ABSOLUTE (Aerial base stations with opportunistic links for unexpected and temporary events). 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