Joint Task Offloading and Resource Allocation for Blockchain-Empowered SAGIN

With the rapid development of the 6G network, the proliferation of Internet of Things (IoT) devices and demand for high-bandwidth and low-latency communications are driving the need for more efficient paradigms. However, due to inherent limitations, IoT devices cannot handle complex tasks independently, necessitating offloading to more powerful resources. As an extension of 6G, the Space-Air-Ground Integrated Networks (SAGIN) achieve broader coverage and efficient resource utilization. Nevertheless, task offloading to SAGIN faces challenges in inefficient resource utilization and security concerns. To address these issues, this paper proposes a novel framework integrating blockchain technology. First, we present a joint task offloading and resource allocation framework in a blockchain-empowered SAGIN (BE-SAGIN). Based on network topology and communication characteristics, a customized blockchain consensus mechanism is designed. Furthermore, the joint task offloading and resource allocation problem is formulated as an optimization problem, considering the cost of tasks and the blockchain system, including delay and energy consumption. Extensive experiments demonstrate that the proposed scheme can significantly reduce system costs, improve resource utilization, and enhance system efficiency compared to baseline approaches.