Location of mobile user in an indoor wireless system operating in 2 GHz frequency band

Advances in indoor short-range wireless communication technology and the proliferation of lightweight handheld devices with built-in high-speed radio access have made wireless LAN deployments increasingly common and the indoor wireless LANs are emerging as an ideal solution for providing high speed connectivity for in-building communications operating in 2 GHz frequency band. The proliferation of mobile computing devices and local area wireless networks has fostered a growing interest in location-aware systems and services. The central to each location-aware application is the ability to determine user locations with a useful degree of accuracy. Efficient location and coordination of mobile users in any office, factory, hospital, library, and other similar categories of large buildings is difficult and recurring problem. Less attention has been paid to the most challenging problem of locating and tracking mobile users, in-building environments and there has been no serious attempt to develop a scientific basis for location of mobile users in indoor environments, which shall be attaining utmost importance for the 4th generation mobile networks. In this paper an attempt has been made to develop model and solution for user location and tracking for an in building wide-area radio frequency (RF) based networks. In the approach proposed by the author, a separate UHF RF transmitter (TX) is deployed by mobile subscriber using WLANs operating at 2 GHz for finding his/her location inside an indoor environment. This concept somewhat draws its strength from the conventional radio direction finding (DF) system.