UAV-Assisted Computing Power Network Task Allocation and 3D Urban Trajectory Optimization

The Computing Power Network (CPN) offers exceptional computational capabilities and reliable network services, with significant potential for future applications. To achieve ubiquitous coverage and efficient computational resource allocation, CPN can be seamlessly coordinated with low-cost Unmanned Aerial Vehicle (UAV)-based mobile computing platforms. This paper investigates an efficient low-altitude UAV-assisted computing power and resource allocation mechanism tailored for urban environments. The aim is to ensure seamless scheduling and efficient processing of computational tasks across various computing devices at different layers of the CPN, while minimizing UAV energy consumption and ensuring flight safety. Firstly, this paper proposes an Urban UAV-assisted CPN task-allocation and UAV trajectory-management decision-making problem. The UAV works until it safely lands, aiming to minimize overall task processing delay and UAV energy consumption while ensuring fairness in task allocation. Then, a novel UAV-Protection based Multi-Agent Deep Deterministic Policy Gradient (UP-MADDPG) algorithm is introduced. It offers dynamic management of secure computing and communication flight paths when facing building blockages. Finally, we compared the proposed algorithm with baseline algorithms across various metrics. Experimental results demonstrate that the proposed algorithm achieves lower and more balanced task execution delay and UAV energy consumption while also improving fairness.