IN-VEHICLE UNIT CONNECTED IN LINE TO CENTER SYSTEM AND METHOD OF CONNECTING IN-VEHICLE UNIT IN LINE TO CENTER SYSTEM

摘要

PPROBLEM TO BE SOLVED: To provide an in-vehicle unit connected in line to a center system capable of suppressing useless charging costs and shortening a time until re-connection. PSOLUTION: An in-vehicle unit 1 is connected in line to the center system which performs packet communication with a center 5 via a communication network 3 of a mobile unit 2 using a communication function of the mobile unit 2 carried into a vehicle. If a socket in an open state does not exist longer than a time during which the absence of communication can be determined, line disconnection is performed. PCOPYRIGHT: (C)2006,JPO&NCIPI