Balancing Transmission and Storage Cost for Reducing Energy Consumption in Mobile Devices

The proliferation of Internet like applications in mobile devices has led to a significant increased amount of energy consumption resulting in frequent recharging cycles of the smartphones. Recent studies reveal that users may want to access the same popular video content multiple times which can be energy inefficient if it is always streamed to the users. To this end, we study different policies in terms of whether or not content should be stored in the device by taking into account the probability of re-using the content, the energy consumption of DRAM (if it is to be stored) and the energy consumption to stream the content again by taking also into account mobility information. The results reveal that a combined scheme based on probabilistic analysis is essential for increasing the lifetime of digital devices, especially for the long-term energy efficiency on the wireless downlink transmission.