Abstract: The paper proposes a mobility handoff scheme for vehicular networks. In this scheme, a mobile node is uniquely identified by its home IPv6 address. In addition, this scheme uses an advanced mobility handoff mechanism. The mobility handoff in the network layer is performed before the one in the link layer is done. Therefore, the AP can forward the data destined for the onboard unit to the onboard unit. Therefore, the advanced mobility handoff mechanism reduces the packet loss rate, shortens the mobility handoff delay, and ensures the communication continuity. The performance parameters of this scheme is analyzed and compared, and the results show that the mobility handoff cost of this scheme is smaller and the mobility handoff delay is shorter.