Field trial of cellular warning for automobiles using geomessaging in Japan

This paper summarizes the background, set-up and results of natural disaster and emergency vehicle warning field trial executed as part of a national Green ITS project in Japan. We used a commercial mobile network as the communication media and ordinary smartphones as terminals for the trial. We used the technique called “geomessaging” developed by Ericsson to identify those cars in the target area to which warning should be sent. The field trial went well and we could get the results as expected but we also found several technical and practical issues.