Fundamental Tradeoffs for Ubiquitous Wireless Service: A QoE, Energy and Spectral Perspective

Recent advances in computing and communication technologies enable the popularity of versatile mobile devices, which accounts for a substantial amount of energy use. The energy consumption has become of unprecedented importance, particularly in a cloud computing systems which provide ubiquitous services. Conventional designs of wireless networks mainly focus on spectral efficiency (SE) enhancing. Given the variety of media services in the cloud environment, a green computing network, which meets the quality of experience (QoE) requirements for users and also improves energy efficiency (EE), is the most appropriate solution. In this paper, we first propose the unit QoE per Watt, which is termed QoE efficiency (QEE), as a user-oriented metric to evaluate EE. Then, we investigate the fundamental tradeoffs between QEE and SE for typical ubiquitous services. Our analytical results are helpful for network design and optimization to access a flexible and desirable tradeoff between the QoE and energy conservation.