A vehicle remote control system includes an in-vehicle transmission unit which transmits an authentication-use inquiry signal and a presence-check inquiry signal; two or more mobile apparatuses, each comprising a reception unit which receives the presence-check inquiry signal and the authentication-use...http://www.google.com/patents/US8164417?utm_source=gb-gplus-sharePatent US8164417 - In-vehicle apparatus remote control system and in-vehicle apparatus remote control method
