A system calls elevator cars using a wireless network of nodes. A mobile node at an unknown location broadcasts a request packet. The request packet includes an identification of the mobile node and an elevator call command. One or more fixed nodes at known locations measure a signal strength of the received request packet and determine a known location of the mobile node based on the signal strength and the known locations of the fixed nodes, and call an elevator car according to the known location of the mobile node and the elevator call command.