Other Classes: 455/456.3 International Classes: H04W24/00 Field of Search: 455/456.1, 455/456.2, 455/456.3 View Patent Images: Download PDF 8170580 US Patent References: 7894987 Hot zones trigger method for location-based applications and services 2011-02-22 Tester et al. 701/213 7848765 ...