| 摘要 |
PURPOSE:To attain the expansion of a serving area, and the effective use of a frequency, by performing transmission to plural portable radio equipments existing within an area including plural serving areas by a radio transmitting station, anmd performing the transmission from respective radio equipment to one weak radio wave receiving station out of the plural serving areas. CONSTITUTION:An area R represents the area possible to receive a small power radio frequency F1 emitted from a radio base station 8 where a work director is present, and portable radio equipments 9-16 carried by workers within the area R can receive radio waves from the radio base station 8 satisfactorily. Also, if the portable radio equipments 9-16 are present in serving areas R1-R6 enclosed by six small circles within the area R, the radio wave(weak radio wave) transmitted from the portable radio equipment can be received satisfactorily by peripheral radio stations R11-R15 within the serving areas. And at the radio base station 8, a receiver capable of receiving the radio wave from the portable radio equipments 9-16 is provided in parallel, and simultaneously, each of the peripheral radio stations R11-R15 and a peripheral radio station 8 is coupled with a wires or wireless transmission line. |
