Communications system for automotive vehicles

Abstract

A communications system for automotive vehicles includes a fixed unit for transmitting an area signal at all times and information signals when, based upon a request signal, it is decided to do so, and a mobile unit mounted on an automotive vehicle for receiving the area signal when the automotive vehicle passes through a communications area and for then transmitting a request signal to receive the information signals from the fixed unit, and is so constructed that the mobile unit first transmits a request signal to the fixed unit, when the automotive vehicle first comes into the communications area, and next the fixed unit transmits the information to the mobile unit after the automotive vehicle further comes nearer to the fixed unit, whereby drops in electric field strength received by the mobile unit are prevented from interrupting the communications of the information, and a stable communications between a fixed communications unit and a mobile communications unit are maintained.

Dependencies are inferred from the claim text.