Patent ID: 6339381
Filing Date: 2002-01-15
Classification: G07B

Abstract:
A DSRC car-mounted equipment comprising:a communication control unit for transmitting and receiving data by radio to and from an on-the-road equipment installed on a road on which a vehicle travels; a radio detector unit for detecting signals received from said on-the-road equipment by detecting the intensity of said radio electric field; and a microcomputer for fetching output signals from said radio detector unit by controlling said communication control unit to process data included in said received signals; wherein said microcomputer includes: an input interface for receiving data related to the speed of said vehicle, and communication area-setting means for variably setting a radio communication area depending upon said vehicle speed data; and wherein said communication area-setting means contracts said communication area when said vehicle speed data represents a low-speed state and expands said communication area when said vehicle speed data represents a high-speed state.