Towards 5G

5 Towards Green and Soft

Chih-Lin I and Shuangfeng Han

Green Communication Research Center, China Mobile Research Institute, China

5.1 Chapter Overview

Wireless communication systems have developed from the first generation (1G) to the latest fourth generation (4G) to satisfy ever-increasing and more diversified mobile-traffic demand. The anticipated 1000-fold wireless traffic increase by 2020 and the global recognition of the importance of green communications, however, pose very tough challenges for the fifth-generation (5G) design. The design metric of spectrum efficiency (SE) maximization, which was much emphasized in previous communication systems, may well be jointly pursued with, amongst other metrics, energy efficiency (EE). In this chapter, we will present green network design considerations from the perspective of network architecture, signaling and control, and high SE and EE transmission techniques. Specifically, in Section 5.2, the motivations for, requirements of, and worldwide activities regarding green radio are introduced. In Section 5.3, one EE and SE co-design framework is presented for link-level optimizations. The impact of system parameters such as frequency bandwidth, total power, antenna number, transceiver number, and so forth, on EE–SE performance is analyzed. Some promising 5G technologies, such as large-scale antenna systems (LSAS) and non-orthogonal multiple access (NOMA), are also described in terms of EE–SE co-design.

To satisfy various ...