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Pictorial representation of offloading techniques given in Figure 2.6. It is classified based on the mode of offload selected, channel model used, computation method used, and energy harvesting method chosen [16]. These are the aspects to be considered when solving a computational model. There are four techniques in computation offloading [15].

1 i) Offloading model - If a task is partitionable, it is divided into two offloading modes: Binary offloading mode, where the whole task is offloaded and the second is a partial mode where a partial task is offloaded.

2 ii) Channel model - The channel model is divided into interference model and interference-free model depending on multiple access mode.Figure 2.6 Offloading techniques.

3 iii) Computing the model-in computation model, the energy consumption and latency for task execution and task transmission depend on the computation and queue model.

4 iv) Energy Harvesting Model - The energy harvesting is also used in managing the energy requirement, which is divided into deterministic and stochastic.

Among those techniques, offloading based on a mathematical model is discussed in the next section.