Abstract
Minimizing energy consumption while providing quality of service (QoS) is of paramount importance for energy-constrained networks, such as Internet of Things (IoT). The emergence of fog computing in IoT has the great potential to reduce the energy consumption of the IoT nodes, which also known as terminal nodes (TNs), and also minimizing the task delays. However, this in general comes at the price of the higher energy consumption of the fog nodes (FNs). This paper aims to study the energy consumption tradeoff between the TNs and FNs in Fog-IoT system. To this end, we first propose a new protocol, where the TNs immediately broadcast their data with certain transmission rate to potentially all FNs without the need of firstly determining which FN to associate with. Upon receiving the data, FNs determine whether to process the data locally or forward to the cloud center, depending on whether they are overloaded or not. By considering the fading channels between TNs and FNs, we mathematically characterize the energy consumption tradeoff between TNs and FNs by varying the broadcasting rate of the TNs.
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