PRIVATE COMMUNICATIONS NETWORK SYSTEM AND METHOD OF AUTHENTICATION FOR A MOBILE STATION USED IN PRIVATE COMMUNICATIONS NETWORKS

摘要

A private communications network system allows amobile station to be used in a different private communicationsnetwork than that in which it is registered, by a method ofauthenticating the mobile station outside of its home privatecommunication network. When a mobile station 17 requestslocation registration in a private communications network 2 inwhich the mobile station 17 is not registered, a control unit 22of a PBX 21 in the private communications network 2 requests anetwork common data management unit 3 to send group data whichis used to identify a private communications network 1 in whichthe mobile station 17 is registered. Control unit 22 thenrequests a PBX 11 in a private communications network 1 to sendsubscriber data 33 of the mobile station 17. The mobile station17 is authenticated in the private communications network 2 bythe subscriber data 33 sent from its home private communicationsnetwork 1, whereafter the mobile station 17 can make calls fromor can receive incoming calls in the private communicationsnetwork 2. Billing data for calls the mobile station has madein the private communications network 2 is transferred andstored in the home network common data management unit 3 on agroup basis.