A device method and system are provided for measuring the body temperature in the area of the head. The method includes maintaining a core-network-specific authentication protocol and a radio-bearer-specific ciphering process, and generating, for each ciphering process, a count parameter including a cyclical sequence number and a hyperframe number which is incremented each time the cyclical sequence number completes one cycle. The new method significantly improves the range of ambient environmental conditions under which human presence detection systems can reliably operate. The stiffeners and the liner panel are preferably made of steel and the stiffeners are welded to the liner panel.