Shaping constant bit rate traffic into bursts has been pro- posed earlier for UDP-based multimedia streaming to save Wi-Fi communication energy of mobile devices. The rela- tionship between the burst size and energy consumption of wireless interfaces is such that the larger is the burst size, the lower is the energy consumption per bit received as long as there is no packet loss. However, the relationship be- tween the burst size and energy in case of TCP traffic has not yet been fully uncovered. In this paper, we develop a power consumption model which describes this relationship in wireless multimedia streaming scenarios. Then, we imple- ment a cross-layer stream delivery system, EStreamer. This system relies on a heuristic derived from the model and on client playback buffer status to determine a burst size and provides as small energy consumption as possible without jeopardizing smooth playback. The heuristic greatly simpli- fies the deployment of EStreamer compared to most existing solutions by ensuring energy savings regardless of the wire- less interface being used. We show that in the best cases using EStreamer reduces energy consumption of a mobile device by 65%, 50-60% and 35% while streaming over Wi-Fi, LTE and 3G respectively. Compared with existing energy- aware applications energy consumption can be reduced by 10-55% further.
|Title of host publication||Proceedings of the 23rd ACM Workshop on Network and Operating Systems Support for Digital Audio and Video|
|Publisher||IEEE Institute of Electrical and Electronic Engineers|
|Publication status||Published - 2013|
|MoE publication type||A4 Article in a conference publication|