Patent ID: 6466777
Filing Date: 2002-10-15
Classification: H04W

Abstract:
A clone terminal detection system comprising:first storage means for updating and storing position registration information of a mobile terminal, which includes a telephone number, on the basis of a position registration request from one of said mobile terminal and a clone terminal illegally copied from said mobile terminal; comparison means for comparing position registration information of an origination request terminal with the position registration information stored in said first storage means at the time of origination request from one of said mobile and clone terminals; and detection means for detecting the presence of said clone terminal having the same telephone number as that of said mobile terminal on the basis of a comparison result from said comparison means; a switching center for switching between mobile communication channels, a plurality of base stations for exchanging information with said switching center and said mobile terminal via a radio interface; a home location register having said storage means, said comparison means, and said detection means, wherein said home location register stores subscriber data of said mobile station, stores in said first storage means position registration information for specifying a correspondence between said mobile terminal and one of said plurality of base stations which controls said mobile terminal, by using the telephone number of said mobile terminal as a search key, and updates and stores the position registration information stored in said first storage means, in accordance with a position registration request received from said mobile terminal every time said mobile terminal moves; a plurality of control groups each formed of base stations grouped in accordance with a location; and second storage means, arranged in said switching center, for storing telephone numbers of the base stations of the plurality of control groups and a representative pilot number of the control groups, wherein said switching center further adds the representative pilot number of the control groups to the position registration information of the origination request terminal from said base station and notifies said home location register of the position registration information with the representative pilot number.