Abstract
In the opening chapter of this book, we first describe the 5G era in terms of the evolution of mobile networks from 1G to 5G, the main application scenarios of 5G, and the development of 5G standards in the introductory section. We then present 5G deployment status and societal impacts, including the multifaceted values being delivered by 5G to our global society. 5G not only supports the different use cases originally conceived but also enables new applications that are critical in crises such as the COVID-19 pandemic to protect our citizens and save their lives. Next, we present the evolution of optical communications, which encompasses the key milestones in optical communications, 5G-oriented optical networks, and the vision of fiber-to-everywhere in the 5G era.
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