Patent ID: 8483612
Filing Date: 2013-07-09
Classification: G08G,H04W

Abstract:
1. A vehicle-to-roadside and vehicle-to-vehicle communication system comprising a plurality of roadside communication devices being arranged on a side of a road, and an on-board communication device mounted on a vehicle which travels with passing through the communication area and being configured to perform a wireless communication by cooperating a vehicle-to-roadside communication between the roadside communication device and the on-board communication device and a vehicle-to-vehicle communication between each of the on-board communication devices; wherein the roadside communication device and the on-board communication device are mutually communicable in the vehicle-to-roadside communication and the vehicle-to-vehicle communication via two wireless channels, which are an infrastructure communication channel and an adhoc communication channel, respectively; the roadside communication device has a function of transmitting roadside information relating to the vehicle-to-roadside communication periodically to the adhoc communication channel; and the on-board communication device is configured to: execute channel switching after notifying channel switching to a communicating party via wireless channel in communication when switching the channel from one to the other and continue the communication, and when receiving the roadside information from the roadside communication device or receiving a channel switching notification from another on-board communication device during the vehicle-to-vehicle communication via the adhoc communication channel, determine whether to switch channels according to a status of the vehicle-to-vehicle communication currently performed and execute channel switching to the infrastructure communication channel after notifying channel switching to the neighboring on-board communication devices in executing channel switching, wherein the roadside communication device includes, a roadside wireless unit for transmitting the roadside information including positional information and wireless channel to the on-board communication device of the traveling vehicle, a roadside information providing unit for storm the roadside information in advance and selecting the wireless channel selectively used by the roadside wireless unit and outputting information, and a roadside control unit for selectively setting a roadside channel in the roadside wireless unit based on the wireless channel selecting information from the roadside information providing unit and regulating the operation of the roadside wireless unit based thereon, wherein the roadside wireless unit includes a roadside first channel communication device for performing wireless communication with the on-board communication device using the first communication channel which is mainly used in the vehicle-to-roadside communication, and a roadside second channel communication device for performing wireless communication with the on-board communication device using the second communication channel which is mainly used in the vehicle-to-vehicle communication; wherein the roadside control unit includes a roadside channel selecting device for selectively setting either the roadside first channel communication device or the roadside second channel communication device for the vehicle-to-roadside communication.