Patent ID: 6477365
Filing Date: 2002-11-05
Classification: H04M,H04W

Abstract:
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, according to a request of a first mobile station of the mobile stations, additional information to be added to a call-in control signal which is to be transmitted to a second mobile station of the mobile stations, the network managing apparatus receives a call-out control signal transmitted from the first mobile station through the radio base station, the network managing apparatus adds the registered additional information to the call-in control signal which is to be transmitted to the second mobile station, the network managing apparatus transmits the call-in control signal to the second mobile 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.