Yanfeng Zhang Yongqiang Liu Yong Xia Quan Huang LeapFrog: Fast, Timely WiFi Handoff. 5170-5174 2007 GLOBECOM http://dx.doi.org/10.1109/GLOCOM.2007.980 conf/globecom/2007 db/conf/globecom/globecom2007.html#ZhangLXH07