An analysis of congestion controls in centralized control systems

This article studies different congestion control methods applied to a centralized control system, consisting in several sensors/actuators and one controller. Sensors/actuators are linked to the controller through an IP network. Depending on the data exchanged, the network can be congested. In such case, the congestion control used by data exchange becomes important. We evaluate four congestion control methods used by three classical transport protocols, UDP, TCP and DCCP. This evaluation uses ns2 network simulator. Results on a centralised control system show that TCP and DCCP offer a good tradeoff on reliability vs. throughput, whereas UDP has best results provided that the network is well configured.