Patent ID: 7460864

Claim:
A roadside narrowband wireless communication apparatus comprising: a roadside antenna apparatus having a wireless communication unit located in the vicinity of a road, the wireless communication unit sending a first radio signal to, and receiving a second radio signal from, a wireless communication device mounted on a vehicle traveling on the road, and a first multiplexing unit connected to the wireless communication unit and receiving a first multiplexed signal including a transmission baseband signal and an adjustment signal, the first multiplexing unit communicating the transmission baseband signal and the adjustment signal to the wireless communication unit for adjusting the wireless communication unit; a roadside apparatus having a second multiplexing unit communicating with the roadside antenna apparatus, the second multiplexing unit sending the first multiplexed signal to, and receiving a second multiplexed signal from, the first multiplexing unit, a wireless communication control unit connected to the second multiplexing unit, the wireless communication control unit receiving the transmission baseband signal and sending the transmission baseband signal to the second multiplexing unit to convert the transmission baseband signal into part of the first multiplexed signal, and a network connection unit connected to the wireless communication control unit and to an external, wired communication network, the network connection unit sending the transmission baseband signal to the wireless communication control unit, and receiving the transmission baseband signal from a system connected to the wired communication network; and an adjustment tool connected to the wireless communication control unit of the roadside apparatus, wherein the second multiplexing unit transmits a transmission reference clock signal together with the transmission baseband signal, at identical signal speeds, and the wireless communication unit of the roadside antenna apparatus generates a multiplied clock signal synchronized to the transmission reference clock signal and communicates with the wireless communication device of the vehicle based on the multiplied clock signal generated.