Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

Tibby Leonard Ball, Jr., 72 of Girard passed away December 19, 2025 at this home with his wife by his side. He was born in Erie to Tibby L. Ball, Sr. and Mary C. (Makey) Ball. Tibby worked at many ...