Once again, 2021 9th International Conference on Communication and Electronics Information was held as a fully virtual conference this year. The organizing committees had hoped to meet every participant physically at the conference, but the unstable situation of the covid-19 made it impossible. It is the organizer's responsibility to put the safety and well-being of all the participants top priority. We wish the epidemic will not keep us from meeting with each other at the conference and have face-to-face communications in the near future.
Accepted and registered papers of ICCEI 2021 will be published in Journal of Advances in Information Technology: http://www.jait.us/index.php?m=content&c=index&a=lists&catid=204 and Journal of Communications: http://www.jocm.us/list-248-1.html