Task offloading in Mobile Edge Computing (MEC) enables resource-constrained IoT devices to reduce latency and energy consumption while enhancing computational performance. However, designing effective offloading strategies presents a multi-objective optimization challenge, particularly in ensuring task reliability while optimizing energy efficiency and latency under dynamic conditions with unpredictable task failures caused by fluctuating computation demands and unstable communication links that severely degrade Quality of Service (QoS). Existing Deep Reinforcement Learning (DRL) approaches struggle to address these reliability-centered challenges, primarily due to their limited adaptability to dynamic reliability requirements, inadequate hybrid action space management, and insufficient handling of complex system state representations. To address these limitations, this work formulates a reliability-aware task offloading problem that explicitly integrates communication and computation reliability with latency and energy consumption into a multi-objective optimization formulation. To solve this optimization problem, the proposed Reliability Energy Latency Task Offloading (RELTO) algorithm employs Proximal Policy Optimization (PPO) within hybrid action spaces and incorporates a context-aware adaptive reward weighting mechanism driven by dual-attention architecture. The mechanism dynamically adjusts objective prioritization particularly emphasizing reliability based on real-time conditions, while attention-based state representation enables proactive decision-making through temporal pattern recognition. Extensive experiments in simulated MEC environments demonstrate that RELTO achieves optimal trade-offs across the key performance metrics, providing a more adaptive and robust solution for multi-objective task offloading.
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