Portable telephone communication system and portable telephone communication method

A portable telephone communication system, comprising:

• a plurality of mobile stations existing in a control zone which denotes a service area;
• a radio base station for communicating with the mobile stations;
• and
• a network managing apparatus for managing a network of the control zone, wherein the network managing apparatus registers a plurality of types of additional information respectively to be added to the call-in control signal, which is to be transmitted to the second mobile station, and a plurality of numbers corresponding to the plurality of types of additional information, the plurality of types of additional information and the corresponding numbers are transmitted to the first mobile station, the first mobile station selects a prescribed type of additional information from the plurality of types of transmitted additional information, the first mobile station adds a number corresponding to the prescribed type of additional information to the call-out control information, the first mobile station transmits the call-out control information to the network managing apparatus through the radio base station, the network managing apparatus adds the prescribed type of registered additional information corresponding to the number, which is added to the call-out control information, to the call-in control signal to be transmitted to the second mobile station, the network managing apparatus transmits the call-in control signal to the second mobile station through the radio base station, and the second mobile station outputs the additional information, which is added to the call-in control signal, before an answer to a call of the first mobile station.

A portable telephone communication method, in which a communication is performed while having a plurality of mobile stations existing in a control zone which denotes a service area, a radio base station for communicating with the mobile stations, and a network managing apparatus for managing a network of the control zone, comprising the steps of:

• registering additional information to be added to a call-in control signal according to a request of a first mobile station of the mobile stations in the network managing apparatus, the call-in control signal being transmitted to a second mobile station of the mobile stations;
• receiving a call-out control signal, which is transmitted from the first mobile station through the radio base station, in the network managing apparatus;
• adding the registered additional information to the call-in control signal, which is to be transmitted to the second mobile station, in the network managing apparatus;
• transmitting the call-in control signal from the network managing apparatus to the second mobile station;
• and
• outputting the additional information, which is added to the call-in control signal, from the second mobile station before an answer to a call of the first mobile station.