Patent ID: 7363028
Filing Date: 2008-04-22
Classification: G05B,G08C,H04L,H04M,H04N,H04W

Abstract:
1. A system for providing location data for use in a portable device, the system comprising: at least one signaling device in each of a plurality of environments having programming for receiving a signal request and, responsive to the signal request, for sending a signal response having a unique identifying characteristic; and a portable device having programming for simultaneously transmitting to each of the plurality of environments the signal request and for receiving the signal response transmitted by the at least one signaling device in each of the plurality of environments; wherein the signal request transmitted by the portable device has a first transmission characteristic purposefully selected so as to ensure that the at least one signaling device in each of the plurality of environments will receive the signal request and wherein the signal response transmitted by the at least one signaling device in each of the plurality of environments has a second transmission characteristic purposefully selected so as to ensure that the portable device receives the signal response transmitted by the at least one signaling device in only a one of the plurality of environments in which the portable device was located when the signal request was transmitted.