Mobile unit communication apparatus

A mobile unit communication apparatus installed in a mobile unit comprising:

• a detecting means for detecting various statuses of said mobile unit and a periphery of said mobile unit, as status data;
• and
• a transmission frequency controlling means for changing a transmission frequency of information signals in accordance with said status data, wherein said information signals are intermittently transmitted;
• means for judging whether or not a predetermined time period for transmitting the information signal is elapsed;
• means for calculating a mobile unit information sending frequency based on said status data when said predetermined time period is elapsed;
• means for judging whether or not the information signal is transmitted based on the mobile unit information sending frequency and a time period, said time period being elapsed after the previous transmission;
• means for producing the information signal to be transmitted at predetermined time period corresponding to the mobile unit information sending frequency;
• means for judging whether or not a received radio wave from other mobile unit exists;
• and
• means for transmitting said information signal when no received radio wave exists in said means for judging existence of said received wave,
• wherein the mobile unit is a vehicle.

A method for transmitting information signals of a mobile unit comprising a steps of:

• (a) judging whether or not a predetermined time period for transmitting the information signal is elapsed;
• (b) calculating a mobile unit information sending frequency based on a status data when said predetermined time period is elapsed;
• (c) judging whether or not the information signal is transmitted based on the mobile unit information sending frequency and a time period elapsed after the previous transmission;
• (d) producing the information signal to be transmitted at predetermined time period corresponding to the mobile unit information sending frequency;
• (e) judging whether or not a received radio wave from other mobile unit exists;
• and
• (f) transmitting said information signal when no received radio wave exists in said judging step for an existence of said received wave.

A mobile unit communication apparatus installed in a mobile unit comprising:

• a status detector for detecting status information of said mobile unit and peripheral information of a subject in periphery of or external to said mobile unit, both as status data;
• a score generator for generating a plurality of scores based on said status data;
• and
• a transmission frequency controller for changing the elapsed time between transmission of information signals based on a sum of said plurality of scores.