  As the fusion of automotive industry and metaverse, vehicular metaverses
establish a bridge between the physical space and virtual space, providing
intelligent transportation services through the integration of various
technologies, such as extended reality and real-time rendering technologies, to
offer immersive metaverse services for Vehicular Metaverse Users (VMUs). In
vehicular metaverses, VMUs update vehicle twins (VTs) deployed in RoadSide
Units (RSUs) to obtain metaverse services. However, due to the mobility of
vehicles and the limited service coverage of RSUs, VT migration is necessary to
ensure continuous immersive experiences for VMUs. This process requires RSUs to
contribute resources for enabling efficient migration, which leads to a
resource trading problem between RSUs and VMUs. Moreover, a single RSU cannot
support large-scale VT migration. To this end, we propose a blockchain-assisted
game approach framework for reliable VT migration in vehicular metaverses.
Based on the subject logic model, we first calculate the reputation values of
RSUs considering the freshness of interaction between RSUs and VMUs. Then, a
coalition game based on the reputation values of RSUs is formulated, and RSU
coalitions are formed to jointly provide bandwidth resources for reliable and
large-scale VT migration. Subsequently, the RSU coalition with the highest
utility is selected. Finally, to incentivize VMUs to participate in VT
migration, we propose a Stackelberg model between the selected coalition and
VMUs. Numerical results demonstrate the reliability and effectiveness of the
proposed schemes.
