Performance evaluation of autonomous decentralized vehicle-grouping protocol for vehicle-to-vehicle communications

In previous years, intelligent transport systems (ITS) have been investigated intensively. In particular, vehicle-to-vehicle communication is expected to be a key technology to enhance flexible networking to exchange various information among vehicles. In vehicle-to-vehicle communications, autonomous decentralized control is required to coordinate the channel use by multiple users because of constant change of vehicle positions. When time division access scheme is employed for vehicle-to-vehicle communications, transmission power control is basically not necessary owing to the high orthogonality among communication channels. In time division transmission, the resource assignment technique is one of the most important issues, and should be realized in an autonomous decentralized manner for ITS scenario. In this paper, two autonomous decentralized resource assignment protocols are proposed and evaluated in terms of the link outage probability. These protocols can assign the same carrier frequency to a group of neighboring vehicles and give an available free time slot to each vehicle without collision.