MOBILE RADIO COMMUNICATION SYSTEM

摘要

A radio base station calls a mobile station in its area through a downstream control channel or a communication channel to designate a channel the electric field level of which is to be measured. The mobile station measures the electric field level of the designated channel by using the electric field level measuring function of its own and reports the measured results to the base station through an upstream control channel or the communication channel. Therefore, a second mobile radio communication system can be constructed in the same area by utilizing a small-zone mobile radio communication system already existing in the area as a first mobile radio communication system.