# A Cache Placement Strategy with Energy Consumption Optimization in Information-Centric Networking
## 4 Simulation Results and Analysis
### Caching Benefit  
The energy saved by the content of the distribution unit capacity is called the caching benefit. The energy saving effect of three different strategies can be shown more concretely. The comparison results of caching benefit of each strategy at node distribution distance variation (1-11) are shown in Figure 6a,b. The analysis is performed under the parameter configurations of the best and worst case conditions. That is to say, \(P_{c}\) is 0.1 and 1, respectively. From Figure 6a,b, it can be seen that the caching benefit of these three strategies is affected by the distribution of nodes; that is, the greater the distance between nodes, the more effective the cache  
Figure 5: (**a**) The effect of node distribution on energy savings (\(P_{c}\) = 0.1); (**b**) the effect of node distribution on energy savings (\(P_{c}\) = 1). Figure 6: (**a**) The effect of node distribution on the caching benefit (\(P_{c}\) = 0.1); (**b**) the effect of node distribution on the efficiency of caching (\(P_{c}\) = 1). policy is. As the _area_ is constantly increased, all three strategies are on the rise. The order of cache effectiveness from high to low is: ESCPS > Random > LCD. Among them, ESCPS has the greatest energy consumption for the saving of the unit bit. This is because the choice of cache placement node is from the perspective of the user, therefore the best placement node can be better selected, and energy can be effectively saved. After \(P_{c}\) became larger, ESCPS still has a good cache effect, although its rate of increase became slower. When \(P_{c}\) is small, compared with ESCPS, Random and LCD can also have good cache benefits as the _area_ is increased, but after \(P_{c}\) becomes larger, the caching benefit of the two policies becomes negative, even when the distance between nodes is increased. It is illustrated that the selected cache placement node does not achieve the effect of saving energy, but consumes more energy. This is because the two policy cache nodes are selected in a way that is not targeted, and the placement of the cache is not considered from the perspective of the user, resulting in a poor adaptability to changes in the network environment. After analysis, we know that ESCPS has better energy saving effect on the content of the unit in the selection of cache placement nodes. The comparison results of the caching benefit of each strategy when the content size of the distribution changes (10 to 100) are shown in Figure 7a,b. The analysis is performed under the parameter configurations of the best and worst case conditions. That is to say, \(P_{c}\) is 0.1 and 1, respectively. From the comparative analysis of Figure 7a,b, it can be seen that the caching benefit of the three strategies is affected by the size of the distribution content. As the content of the distribution increases, the caching benefit of the three strategies is ranked from highest to lowest: ESCPS > Random > LCD. In the ESCPS, no matter when the size of the distribution content changes or the energy consumption of the node change is increased, the higher caching benefit is always maintained without significant fluctuations. It shows that this strategy can hardly be affected by the content of distribution, and has better stability for the energy consumption saved by unit content. Compared with ESCPS, LCD and Random are greatly influenced by the size of the transmitted content and \(P_{c}\). When \(P_{c}\) is small, the caching benefit of the two strategies is still positive, indicating that the unit content is energy-saving. After \(P_{c}\) is increased, the caching benefit of LCD and Random is reduced to negative values, even when the content is large. It shows that the energy saving effect on the unit content has not been done, but the energy consumption is increased, and the energy saving function needs to be brought up when the content of the distribution is large enough.