In the past, most of the attention was given to Location Based Services (LBS) in outdoor environments as GPS played the dominant role in localization.
Recently, we are seeing a paradigm shift in the mobile applications market, where indoor LBS is being considered the new frontier.
Due to the increasing number of mega size multi-level constructions like airports, shopping malls, universities and other
facilities, people tend to spend more time indoors.
Research shows people only spend 10-20% of their time outdoors [1] and more than 70% calls originate from indoors which indicates great potential for indoor LBS.