MOBILE COMMUNICATION SYSTEM AND COMMUNICATION NETWORK

摘要

A mobile communication system in which each of communication networks is provided with one location register (home location register or gateway location register) and one or more service area registers. The service area registers are provided in the service areas respectively and store the communication terminal information of communication terminals existing in the service areas. The location register stores the numbers of the service area registers of the service areas in which communication terminals exist and the communication terminal information of the communication terminals. When a communication terminal moves from one communication network into another, the communication terminal information is transmitted from the location register of the one communication network to the location register of the another communication network. When a communication terminal moves from one service area into another service area in the same network, the communication terminal information is given to the service area register from the location register. When a communication terminal moves into a service area, the communication terminal information is transmitted from the service area register to the communication terminal. Therefore, the traffic of common control lines between and in communication networks can be reduced.