|| Seminar at the Signals & Systems Group
Title: A control theoretic perspective to congestion
control in packet switched networks: the case of TCP Westwood
Speaker: Associate Professor Saverio
Mascolo, Politecnico di Bari
- Time and Place:
- Tuesday, October 23rd, at 14:15
Library, floor 2 at Magistern, Dag Hammarskjölds väg 31, Uppsala
High-speed communication networks are characterized by large bandwidth-delay
products. This may have an adverse impact on the stability of closed-loop
congestion control algorithms. Here, classical control theory and
Smith's principle are proposed as key tools for designing an effective
and simple congestion control law for high-speed data networks.
The control law is transformed to a window form and is applied to
Internet. The resulting control law surprisingly reveals that today's
TCP/IP protocol implements a Smith predictor for congestion control.
This provides a theoretical insight into the congestion control mechanism
of TCP/IP along with a method to modify and improve this mechanism
in a way that is backwards compatible. Finally TCP congestion control
known as Westwood TCP is illustrated.
- More information on TCP Westwood and Powerpoint files from the presentation.