*5.2. Effect of the Inter-Task Occurrence Rate*

Figure 5 shows the effect of the inter-task occurrence rate *λ<sup>i</sup>* of IoT device *i*. From Figure 5, it can be found that the average energy outage probabilities of all schemes increase with the increase of the inter-task occurrence rate. This is because IoT devices consume more energy when tasks occur frequently. However, the incremental ratio of the EE-CCA is smallest among comparison schemes. This is because IoT devices in the EE-CCA operate adaptively even when the operating environment changes. Specifically, as the inter-task occurrence rate of IoT device *i* increases, it offloads more tasks to its opponent to avoid the energy depletion.

**Figure 5.** Effect of the inter-task occurrence rate on the average energy outage probability.

#### *5.3. Effect of the Average Deadline*

The effects of the average deadline of the task on the average energy outage probability are demonstrated in Figure 6. From Figure 6, it can be observed that the average energy outage probability of the EE-CCA decreases with the increase of the deadline. This is because, when a sufficient deadline is given, IoT devices in the EE-CCA can handle the task within the deadline by themselves even though they do not offload any tasks to energy-scarce opponents. On the other hand, the other schemes follow the fixed policy regardless of the deadline of the task, and thus their average energy outage probabilities do not change according to the deadline.

**Figure 6.** Effect of the average deadline of the task.
