Patent ID: 7376430
Filing Date: 2008-05-20
Classification: G01S,H04W

Abstract:
1. A location system comprising: a mobile terminal capable of performing a plurality of positioning methods, said mobile terminal transmitting a registration message containing selectability information indicating whether the mobile terminal is capable of selecting said positioning methods; a client terminal that transmits a location request message that requests location information of said mobile terminal, said location information having requested accuracy; a plurality of wireless nodes for establishing a wireless link to said mobile terminal; and a controlling node connected to said wireless nodes for receiving said registration message from said mobile terminal, storing said selectabilitiy information, and receiving said location request message from said client terminal and examining said stored selectability information, wherein said controlling node transmits a control message that specifies said requested accuracy of location information to the mobile terminal if the examined selectability information indicates that the mobile terminal is capable of selecting said positioning methods; wherein said mobile terminal is responsive to said control message by selecting one of said positioning methods that satisfies the specific accuracy of location information specified in the control message, performs the selected positioning methods to produce measurement data, and transmits the measurement data to said controlling node.