  The cooperative transmission is an effective approach for vehicular
communications to improve the wireless transmission capacity and reliability in
the fifth generation (5G) small cell networks. Based on distances between the
vehicle and cooperative small cell BSs, the cooperative probability and the
coverage probability have been derived for 5G cooperative small cell networks
where small cell base stations (BSs) follow Poisson point process
distributions. Furthermore, the vehicular handoff rate and the vehicular
overhead ratio have been proposed to evaluate the vehicular mobility
performance in 5G cooperative small cell networks. To balance the vehicular
communication capacity and the vehicular handoff ratio, an optimal vehicular
overhead ratio can be achieved by adjusting the cooperative threshold of 5G
cooperative small cell networks.
