The smart vehicles construct Internet of Vehicle(IoV) which can execute various intelligent services. Although the computation capability of a vehicle is limited, multi-type of edge computing nodes provide heterogeneous resources for intelligent vehicular services. When offloading the complex service to the vehicular edge computing node, the decision for its destination should be considered according to numerous factors. The mostly formulate the offloading decision as a resource scheduling problem with single or multiple objective constraints, where some customized heuristics algorithms are explored. However, offloading multiple data dependency tasks in a complex service is a difficult decision, as an optimal solution must understand the resource requirement, the access network,the user mobility, and importantly the data dependency. Inspired by recent advances in machine learning, we propose a Knowledge Driven (KD) service offloading decision framework for IoV,which provides the optimal policy directly from the environment.We formulate the offloading decision for the multiple tasks as a long-term planning problem, and explore the recent deep reinforcement learning to obtain the optimal solution. It can scruple the future data dependency of the following tasks when making decision for a current task from the learned offloading knowledge. Moreover, the framework supports the pre-training at the powerful edge computing node and continually online learning when the vehicular service is executed, so that it can adapt the environment changes and can learn policy that are sensible in foresight. The simulation results show that KD service offloading decision converges quickly, adapts to different conditions, and outperforms a greedy offloading decision algorithm.
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