A High-Reliability Small-Area Task Offloading Mechanism With Trust Evaluation and Fuzzy Logic in Power IoTs

In order to solve the problem that high-priority tasks can not be processed timely and reliably due to the disorder of multi-task and dynamicity in Power Internet of Things(PIoTs), a high-reliability small-area task offloading mechanism with trust evaluation and fuzzy logic(HRSATF) is proposed. First, considering task priority, preemptive priority queue is introduced to ensure high-priority tasks processed preferentially, and minimum resource allocation coefficients(MRACs) of tasks are solved to ensure the effectiveness of offloading. Second, the trust model between smart device(SD) and edge server(ES) is established, and ESs are divided into three priorities based on trust value and computing power by fast non-dominated sorting. Thirdly, fuzzy logic is applied to select target ES when the priorities of task and ES do not match or the ES is offline, and MRAC is used to schedule tasks between SD and ES. Finally, NSGA2 is modified (MNSGA2) to verify the effectiveness of HRSATF in terms of success rate, time, power consumption and load balancing, where success rate is increased by <inline-formula><tex-math notation="LaTeX">$102.3\%$</tex-math></inline-formula>, and time and power consumption are decreased by <inline-formula><tex-math notation="LaTeX">$90.7\%$</tex-math></inline-formula>, <inline-formula><tex-math notation="LaTeX">$89.3\%$</tex-math></inline-formula> at most, respectively.