Patent ID: 6985723

Claim:
An apparatus for providing public and private mobile communication service in a mobile communication system including public cell areas each having a corresponding public base station transceiver subsystem for communicating with mobile stations having access to a public mobile communication service, a plurality of public base station controllers for communicating with the public base station transceiver subsystems, a public mobile switching center for communicating with said public base station controllers and with a public switched telephone network and an integrated services digital network, said public mobile switching center being connected to a location register unit including a public home location register and a public visitor location register, said apparatus comprising: public and private communication service unit for communicating with an Internet protocol network, one of said public base station controllers, said public switched telephone network and said integrated services digital network; and a private base station transceiver subsystem for communicating with a mobile station within a common cell area in which said mobile station can communicate with a private mobile communication service and said public mobile communication service, wherein said mobile station in said common cell area is registered in a private visitor location register included in said public and private communication service unit for enabling said mobile station in said common cell area to communicate with said private mobile communication service, and is further registered in at least one of said public home location register and said public visitor location register for enabling said mobile station in said common cell area to communicate with said public mobile communication service, said public and private communication service unit comprising: a call manager which is a main controller of the public and private communication service unit; a private branch exchange connected to said public switched telephone network and said integrated services digital network; and a first private base station controller for communicating with said mobile station within said common cell area, said public base station controller, said call manager and said private branch exchange.