Task offloading in three-layer fog computing environments presents a critical challenge due to user equipment (UE) mobility, which frequently triggers costly service migrations and degrades overall system performance. This paper addresses this problem by proposing MOFCO, a novel Mobility- and Migration-aware Task Offloading algorithm for Fog Computing environments. The proposed method formulates task offloading and resource allocation as a Mixed-Integer Nonlinear Programming (MINLP) problem and employs a heuristic-aided evolutionary game theory approach to solve it efficiently. To evaluate MOFCO, we simulate mobile users using SUMO, providing realistic mobility patterns. Experimental results show that MOFCO reduces system cost—defined as a combination of latency and energy consumption—by an average of 23% and up to 67% in certain scenarios compared to state-of-the-art methods.

This paper presents DIST, a novel distributed reinforcement learning-based (DRL) framework for energyefficient and reliable task scheduling and resource allocation in fog computing, low-latency computing solutions driven by the rapid deployment of IoT devices, and time-sensitive applications. DIST is built based on a novel distributed Q-learning to enable fog nodes to learn an optimal strategy to balance energy consumption, task execution time, and system reliability. The main novelty includes a cooperative Dynamic Voltage and Frequency Scaling-enabled task scheduling policy that dynamically adjusts node energy level to ensure power consumption reduction without sacrificing deadline adherence or reliability. The results demonstrate that DIST reduces energy consumption by up to 52.26%, realizes 38% higher success rates, and reduces task wait times by up to 46.77%, compared with state-of-the-art algorithms.

Fog computing enhances cyber-physical systems (CPS) by processing data closer to the network edge. However, the performance of fog nodes is critical for maintaining system responsiveness and quality of service (QoS). This paper introduces MoTiCPS, a novel task scheduling and resource allocation method built on the Osprey Optimization Algorithm (OOA). MoTiCPS improves task reliability and balances resource use across edge devices, optimizing fog node performance under real-time constraints. Simulation results show that MoTiCPS increases task success rates by 32% and reduces energy consumption by 39%, significantly outperforming benchmark methods. These improvements highlight MoTiCPS's potential to enhance the efficiency and scalability of CPSs in various application domains.

RPL is introduced to conduct path selection in Low-power and Lossy Networks (LLN), including IoT. A routing policy in RPL is governed by its objective function, which corresponds to the requirements of the IoT application, e.g., energy-efficiency, and reliability in terms of Packet Delivery Ratio (PDR). In many applications, it is not possible to connect the nodes to the power outlet. Also, since nodes may be geographically inaccessible, replacing the depleted batteries is infeasible. Hence, harvesters are an admirable replacement for traditional batteries to prevent energy hole problem, and consequently to enhance the lifetime and reliability of IoT networks. Nevertheless, the unstable level of energy absorption in harvesters necessitates developing a routing policy, which could consider harvesting aspects. Furthermore, since the rates of absorption, and consumption are incredibly dynamic in different parts of the network, learning-based techniques could be employed in the routing process to provide energy-efficiency. Accordingly, this paper introduces LANTERN; a learning-based routing policy for improving PDR in energy-harvesting IoT networks. In addition to the rate of energy absorption, and consumption, LANTERN utilizes the remaining energy in its routing policy. In this regard, LANTERN introduces a novel routing metric called Energy Exponential Moving Average (EEMA) to perform its path selection. Based on diversified simulations conducted in Cooja, with prolonging the lifetime of the network by$5.7\times $, and mitigating the probability of energy hole problem, LANTERN improves the PDR by up to 97%, compared to the state-of-the-art. Also, the consumed energy per successfully delivered packet is reduced by 76%.