H$^{3}$DRA: Achieving Resilient Task Scheduling for Zero-Interruption Vehicular Edge Computing in Sixth-Generation Networks

The paradigm shift toward 6G-enabled immersive services, including extended reality (XR) communication, holographic interaction, and distributed multisensor intelligence, imposes unprecedented challenges to vehicular networks. These mission-critical applications require zero-interruption continuity, deterministic ultra-low latency, and sustained high-throughput task execution in highly dynamic vehicular environments. To achieve stability, adaptability, and efficiency in 6G-vehicular edge computing (VEC), this paper proposes a new three-layer hierarchical deep reinforcement learning scheduling (H <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{3}$</tex-math></inline-formula> DRA) framework, which involves an interruption prediction-empowered adaptive task allocation (IPred-ATA) technique that dynamically optimizes scheduling destinations through proactive failure prediction and multi-objective utility maximization. We further design a clustering-assisted hierarchical reinforcement learning (CAHRL) algorithm that addresses the challenges of multi-hop path selection within dynamic network topologies by decomposing the large-scale, complex state-action space into manageable hierarchical structures. Simulations demonstrate that the proposed H <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{3}$</tex-math></inline-formula> DRA outperforms classical algorithms by 48% in stability and by 32% in task throughput.