We welcome you to the first issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 20 papers covering different aspects of communication networks. In particular, these articles survey and tutor various issues in “Wireless Communications,” “Vehicular and Sensor Communications,” “Network Virtualization,” “Network Security,” “Multimedia Communications,” “IoT and M2M,” and “Internet Technologies.” A brief account for each of these papers is given below.

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社论：2021年第一季度IEEE通信调查和指南

我们欢迎您阅读2021年第一期IEEE通信调查和指南。本期包括20篇论文，涉及通信网络的各个方面。特别是，这些文章对“无线通信”，“车辆和传感器通信”，“网络虚拟化”，“网络安全”，“多媒体通信”，“ IoT和M2M”和“ Internet技术”中的各种问题进行了调查和辅导。这些论文的简要说明如下。