Mobility Handover in VANET

In vehicular ad hoc network (VANET) with multihoming, each vehicle is configured with multiple care-of addresses with different network prefixes. As a main part of the handover, the care-of address configuration occupies a large proportion of the handover latency, so VANET with multihoming suffers from substantial handover latency. This paper focuses on the handover in VANET with multihoming and aims to reduce the handover latency. In this paper, the architecture of VANET with multihoming is presented and based on this architecture the address separation mechanism is proposed to solve the address configuration issue. In this mechanism, the node ID in one address is separated from the network prefix. In this way, each vehicle is independently configured with a globally unique node ID only once during its lifetime and then combines its node ID with the network prefixes to construct multiple addresses. Based on this mechanism, the handover algorithm is proposed. In this algorithm, a vehicle achieves the handover without performing care-of address configuration, so the handover latency is reduced. The experimental results demonstrate the feasibility and superiority of the proposal.