Patent ID: 8819418
Filing Date: 2014-08-26
Classification: G08G,H04L,H04W

Abstract:
1. A communication system comprising: a certificate authority configured to perform authentication; a roadside device configured to be provided at a roadside; a plurality of vehicle-mounted terminals each having a certificate; a first server configured to collect position information about the vehicle-mounted terminals; and a second server configured to manage information about the roadside device and vehicle-mounted terminals whose certificate is invalidated, wherein the communication system is configured to transmit and receive information between the roadside device and the vehicle-mounted terminals and between the vehicle-mounted terminals, wherein the vehicle-mounted terminals are each configured to transmit its own position information to the first server, wherein the certificate authority is configured to: wherein the roadside device and the vehicle-mounted terminals are configured to verify a certificate using the received first and second lists.