Researches on the network support environment of the collaboration-based virtual laboratory

With the development of the broadband IP platform, the Internet-based collaboration applications not only improve efficiency, but also save money. The paper investigates the network support environment of the virtual laboratory, including the gateway queue mechanism and end-to-end congestion mechanism. Then we analyze the shortcomings of the current mechanisms, and present an adaptive end-to-end congestion mechanism based on the UDP which guarantees minimum rates. Finally, we briefly evaluate our method and discuss how to improve it.