Patent ID: 7522926

Claim:
A method for location identification, comprising: receiving information from a plurality of RFIDs for determining a location of a mobile terminal; maintaining an in-range list that comprises all the RFIDs in which said mobile terminal is currently within their coverage range; calculating the location of the mobile terminal in response to said received information for determining a location by calculating the common coverage area of said RFIDs in said in-range list, wherein the information for determining a location from said RFID comprises the location information of said RFID and the coverage range information of said RFID; maintaining an out-range list that comprises a list of the RFIDs that said mobile terminal is currently out of their coverage range, wherein calculating said mobile terminal's location range comprises subtracting the coverage range of each RFID in said out-range list from the common coverage area of said RFIDs in said in-range list, and the information for determining a location from said RFID further comprises the location information of RFID's neighboring said RFIDs and said neighboring RFID's respective coverage range information; adding a new RFID to said in-range list when said mobile terminal receives a signal from said RFID; and adding said neighboring RFIDs that are not present in the in-range list to said out-range list according to the information that comes from said RFID and that represents the location of said neighboring RFIDs and their respective coverage range.