During real experiences, the robot may not detect the RFID
tags (e.g., due to the lack of signals in a certain area) and it
may get lost or it may have a cyclic behavior. In that case, this
system must be completed using other navigation system or another kind of signals, such as the existing visual signals of the
environment. Other solutions could be the use of learning techniques to learn the already visited places and paths; finally, the
robot could ask for help to the people around.