I Welcome you to the third issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 18 articles covering different aspects of communication networks. In particular, these articles survey and tutor various issues in “Wireless Communications,” “Internet Technologies,” “IoT and M2M,” “Network and Service Management and Green Communications,” “Network Security,” “Network Virtualization,” and “Vehicular and Sensor Communications.” A brief account for each of these articles is given below.

中文翻译：

---

社论：2021 年第三季度 IEEE 通信调查和教程


欢迎您阅读 2021 年第三期 IEEE 通信调查和教程。本期包括 18 篇文章，涵盖通信网络的不同方面。特别是，这些文章对“无线通信”、“互联网技术”、“物联网和 M2M”、“网络和服务管理与绿色通信”、“网络安全”、“网络虚拟化”和“车辆”等领域的各种问题进行了调查和指导。和传感器通信。”下面对每篇文章进行简要说明。