祝贺Khoa N. Le教授新书《Physical Layer Security》由Springer出版，新南威尔士大学Jinhong Yuan教授和我合作贡献了一章《Physical Layer Security in Cache-Enabled Heterogeneous Cellular Networks》，欢迎感兴趣的朋友阅读，提出宝贵意见。

摘抄编辑序言中一段话，物理层安全近五年在全球得到了高强度的研究，欢迎感兴趣的朋友加入物理层安全研究行列，共同保护我们的无线网络安全。

A quick search in the Scopus database can reveal some interesting facts. Specififically, the number of PLS publications to date is 6958, compared with 4836 for 2015–2020 and 264 for the year to date. This means that the number of publications in the last 5 years is about 70% of total PLS publications, which shows the research intensity around the world on PLS, hence its importance and relevance to our lives.

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