Editorial: Second Quarter 2021 IEEE Communications Surveys and Tutorials

Abstract

We would like to welcome the readers to the second issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 21 articles covering different aspects of communication networks. In particular, these articles survey and tutor various issues in 'Wireless Communications,' 'Vehicular and Sensor Communications,' 'IoT and M2M,' 'Network Security,' 'Multimedia Communications,' 'Internet Technologies,' 'Network and Service Management,' and 'Optical Communications.' A brief account for each of these articles is given below.