A messaging unit equipped with a cellular transceiver is attached to a truck trailer or a monitoring station located within a communications network. The messaging unit generates a data message in response to the occurrence of a reporting event. Upon generation of a data message, the messaging unit transmits...http://www.google.fr/patents/US6295449?utm_source=gb-gplus-shareBrevet US6295449 - Data messaging in a communications network using a feature request
Data messaging in a communications network using a feature request
