PCT No. PCT / JP96 / 01126 Sec. 371 Date Dec. 30, 1996 Sec. 102(e) Date Dec. 30, 1996 PCT Filed Apr. 25, 1996 PCT Pub. No. WO96 / 35307 PCT Pub. Date Nov. 7, 1996In a mobile communication
system according to this invention, an integrated control apparatus (ISa1) is arranged between a plurality of base stations (CSa1, CSa1, . . . ) arranged in an area with a low traffic density, and a public
digital network (INW), the integrated control apparatus (ISa1) accommodates I' lines of the base stations (CSa1, CSa1, . . . ), the integrated control apparatus (ISa1) and the public
digital network are connected via I' lines having a smaller number of channels than the total number of channels of the I' lines, and the integrated control apparatus (ISa1) performs various kinds of control for
call origination / termination with the base stations (CSa1, CSa1, . . . ).