A Greener Experience: Trade-Offs between QoE and CO<sub>2</sub> Emissions in Today's and 6G Networks
Tobias Hoßfeld, Martı́n Varela, Lea Skorin‐Kapov, Poul E. Heegaard
Abstract
While users of Internet multimedia services demand high Quality of Experience (QoE), meeting these demands results in energy consumption along the service delivery path, from the end user's device, through the network to the service infrastructure (e.g., in a cloud). This energy consumption typically implies carbon dioxide (CO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> ) emissions, which are a primary driver of climate change. One contribution of this article is to quantify and illustrate the trade-off between the QoE of video streaming services and CO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> emissions. Kleinrock's power metric from queuing theory is applied to find operational points and recommended video bitrates of the QoE-sustainability trade-off. Furthermore, considering that networks and service delivery infrastructures are still in the process of transitioning towards “green energy” consumption, we investigate the impact of “green users” accepting certain quality degradations so as to reduce CO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> emissions. Our discussions focus on two aspects: Is it more relevant to focus on green user behavior or green networking technology today and in the future in year 2030? What are the implications of solution approaches on the networking and communications technology?