Mobile radio communication system and channel control method therefor

Claim 1

In a mobile radio communication system having a plurality of base stations and a plurality of mobile stations, said plurality of base stations each sending a down-going control signal at a predetermined period over a same radio channel implemented as a time division multiplex transmission path, said plurality of mobile stations each performing a waiting procedure at a period synchronous to the down-going control signal detected to thereby receive control data from any one of said plurality of base stations, said plurality of mobile stations each comprising: a threshold setting section for storing a threshold electric field level; a controller for setting the threshold electric field level, from a plurality of threshold electric field levels, in said threshold setting; a field level decision section for outputting a decision signal when a received electric field level of a received signal exceeds the threshold electric field level stored in said threshold setting section; and a demodulating section for starting, in response to said decision signal, a procedure for setting up synchronization to the down-going control signal included in the received signal.