Abstract:

With the increasing use of wireless networking, especially
802.11-based wireless systems in enterprise networks, the
thrust now is to develop services that provide more than
untethered network access. An important class comprises those
services that use end-user location information. Such services
include location-aware content delivery, emergency location,
services based on the notion of closest resource, and location-based
access control. Techniques that can estimate location in
indoor environments, preferably without client changes, are
important to enable such services in enterprises. Traditional
GPS methods cannot be used for this since they have problems working indoors. Further, the use of techniques such as
angle of arrival, Time difference of arrival etc. require client modifications or substantial changes to the infrastructure. Therefore, we focus our discussion on methods based on received signal strength measurements.

We will discuss the basic ideas and some recent work in this area. Implications for deployment and maintenance of such systems will also be considered. We will present experimental results from deployed systems and compare the results from the literature.
This leads us to the question of fundamental limits to location estimation accuracy and we will outline a theoretical analysis that addresses this.

Date: 2004-Nov-22     Time: 14:30:00     Room: Anfiteatro do Complexo Interdisciplinar

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