Vint “Internet Pioneer” Cerf co-authored this IETF RFC, which is working to establish a standard for stringing up an Interplanetary Internet. The preamble alone is worth the read, stirring and thought-provoking stuff.
Remember always that launch mass costs money. Think not, then, that you may require all the universe to adopt at once the newest technologies. Be backward compatible.
Never confuse patience with inaction. By waiting for acknowledgement to one message before sending the next, you squander tracking pass time that will never come to you again in this life. Send as much as you can, as early as you can, and meanwhile confidently await responses for as long as they may take to find their way to you.
Therefore be at peace with physics, and expect not to manage the network in closed control loops — neither in the limiting of congestion nor in the negotiation of connection parameters nor even in on-demand access to transmission bands. Each node must make its own operating choices in its own understanding, for all the others are too far away to ask. Truly the solar system is a large place and each one of us is on his or her own. Deal with it.