A Localized Forwarding Scheme for the Shared-Prefix Model-Based Vehicular Mobility Management Over IEEE WAVE IPv6 Networks

IETF IP Wireless Access in Vehicular Environments Working Group proposes a shared-prefix model, where multiple RSUs share a common prefix. In the same prefix domain, a WAVE wireless interface does not need to reconfigure its IPv6 address even if its serving RSU is changed. We had proposed a vehicular mobility management scheme for a shared prefix model over IEEE WAVE IPv6 networks. However, when two vehicles communicate with each other, the data path between two vehicles can be sub-optimal. In the scheme, all incoming packets having a specific prefix are forwarded by a Link Border Router, which manages the prefix, to the serving RSU of the destination vehicle. It causes the triangular data path. To eliminate this triangular data path, we propose a localized forwarding scheme for the vehicular mobility management scheme. This scheme allows that two vehicles within direct communication distance can communicate directly or serving RSUs of two vehicles can communicate directly for intra-vehicular traffic within the WAVE network. It eliminates the triangular data path between two vehicles within the WAVE network. It also reduces the workload of Link Border Routers, which are the hotspot of the vehicular mobility management scheme.