Patent ID: 8630589

Claim:
An onboard radio communication system having a radio network constructed by arranging a plurality of radio sets within a first vehicle for transmitting and receiving radio signals in said first vehicle, the onboard radio communication system comprising: a radio transmitting and receiving unit for achieving timing synchronization on a fixed-period radio communication frame basis, for assigning, to a prescribed period at a head portion in the frame, report signals for reporting state management information about the radio sets to other radio sets arranged within the first vehicle and control signals for controlling the individual radio sets arranged within the first vehicle, for transmitting and receiving the report signals and the control signals, for selecting one of frequency channels capable of radio communications, and for transmitting and receiving the radio signals via the selected frequency channel in a time sharing manner; an adjacent vehicle detection unit for detecting a second vehicle adjacent to the first vehicle; a radio interference decision unit, which is started when the adjacent vehicle detection unit detects the adjacent second vehicle, for deciding the presence or absence of interference due to radio waves leaking from the second vehicle based on a determination that the interference level exceeds a predetermined threshold value; and a frequency channel switching unit for switching, when the radio interference decision unit decides that the radio interference is present, a frequency channel in use by scanning other switchable frequency channels, and by reporting a frequency channel with which the scanning succeeds to the other radio sets arranged within the first vehicle via the report signals; and wherein the radio interference decision unit: when deciding that the radio interference is present, reports to the other radio sets arranged within the first vehicle that the radio interference is present using the report signals; and instructs switching to a frequency channel without the radio interference using the control signals.