Detailed Information about Communication design (in German):
by Studicheck: http://bit.ly/2bunnk2
by ‚Bachelor and more“: http://bit.ly/2bupqUU
by ‚Medien studieren.net‘: http://bit.ly/2buosIj
"Medien studieren.net" offers a contact form for further information needs.
They answer your question on their site as follows (rough translation by me):
"A general answer isn't possible because of differnces between universities in federally organiszed education system in Germany. Ask the university you want to join for their conditions. See our list of universities here: http://bit.ly/2buqgB2"
Kind regards, Jan