In internet of things (IoT) networks, resource-constrained devices can offload data to mobile edge computing (MEC) servers for processing. Nevertheless, offloading incurs additional energy consumption, making energy-efficient offloading a critical issue. Furthermore, the mismatch of transmission and computation traffic rates further exacerbates energy inefficiency. Additionally, ensuring quality of service (QoS) requires not only meeting the per-slot processed data volume thresholds of devices b