Critically compare the congestion control on TCP/IP and ATM?

Dear Sirs and Madams,

A friend of mine are working on the paper on "critically compare the 
congestion control on TCP/IP and ATM", and she ask me for help. But I do 
not get much idea on the "congestion control on ATM". So, is there anyone 
can give me any idea on this topic, while my friend and I processing on 
this? Thank you!
rgds,

Sincerely yours,
Jianbo Huang