A method of performing a
location based service and in particular a contactless check-in procedure in a public transportation vehicle, which is considered very user-friendly, but also robust, reliable and accurate. In a first aspect there is provided, a method of performing a location-based service using a
radio frequency, RF,
signal based
positioning system, the method comprising the steps of: -
broadcasting, by a
mobile device, an RF
signal upon approaching the location of the
location based service; - receiving, by at least one RF
beacon, said RF
signal, wherein the RF
beacon is installed at the location of the
location based service; - measuring, by a
processing unit, said a
signal strength of the received RF signal, wherein the
processing unit is in communicative connection with said at least one RF
beacon; - determining, by the
processing unit, a location of the
mobile device within said location of the location-based service, wherein said location is determined by said measured
signal strength; - forwarding, by the processing unit, said location of the
mobile device to a central
server over a
wireless telecommunication network, for comparing the location with a predefined
service location for performing a service of said location-based service to said mobile device, wherein the RF beacon comprises an array of antennas arranged for monopulse tracking to accurately determine the location of the mobile device within said predefined
service location.