Private mobile communication system easily connecting portable or mobile radio telephone equipment to public network

Claim 1

A private mobile communication system comprising: a plurality of radio base stations including a private protocol processing section to transmit/receive a private protocol information through a private control channel, and a public protocol processing section to transmit/receive a public protocol information through a private control channel; a private exchange connected to said respective radio base stations and at least a public network which includes means for transferring authentication information between a portable or mobile radio equipment and said public network, the exchange including a private protocol controlling section for processing a signal transmitted by a portable or mobile radio telephone equipment that belongs to a private system by using said private protocol, and a different system protocol controlling section for permitting access to said public network based on a signal transmitted by a portable or mobile radio telephone equipment which does not belong to said system by using said public protocol through said private control channel; a plurality of portable or mobile telephone equipment, which belong to a different system from said system and can be connected to said system and at least a public system, include a public control channel controlling section to incorporate a public control signal into a control slot of a public control channel, a private control channel controlling section to incorporate a private control signal into a control slot of a private control channel, a private protocol processing section to control said private protocol information, a public protocol processing section to control said public protocol information, and a switch section to connect said private control channel controlling section to either said public protocol processing section or said private protocol processing section or to connect said public control channel controlling section to public protocol processing section, said switch connection said private channel controlling section to said public protocol processing section to pass said authentication information of the portable or mobile radio telephone equipment which belongs to a different system to said public network through said private exchange when calls are placed through the portable or mobile telephone equipment which belongs to a different system out to said public network from inside of said system.