| 摘要 |
PURPOSE:To cancel a problem of 'hidden terminal' that both of right and left side repeaters can not be distinguished when a repeater simultaneously receives transmission at the equal frequency from both of them concerning a radio transmission system for successively repeating small power radio equipments by utilizing a carrier sense system. CONSTITUTION:Radio channels, 1, 2 and 3 are secured for an entire transmission system, the mutually different channels of three channels are set for terminating and originating a call between adjacent radio transmitters/receivers. Further, a repeating transmitter A setting the channel 1 as a radio channel for call termination and setting the channel 2 as a radio channel for call origination, repeating transmitter B setting the channel 2 as a radio channel for call termination and setting the channel 3 as a radio channel for call origination, and repeating transmitter C setting the channel 3 as a radio channel for call termination and setting the channel 1 as a radio channel for call origination are arranged in the order of A-B-C-A-... successively. Further, the header part code of transmitting data is inspected, in the case of down data, the channel 3 is set as the radio channel for call origination at the repeating transmitter A, the channel 1 is set at the repeating transmitter B, and the channel 2 is set at the repeating transmitter C. |
