APID: A congestion controller with adaptive parameter tuning

作者：Yang Xiang; Wang Jian Xin^*

来源：Journal of Central South University(Science and Technology), 2012, 43(11): 4321-4327.

• Active Queue Management
• Adaptive Control
• Adaptive parameters
• Band-width utilization
• Buffer occupancy
• Congestion controllers
• Control process
• End to end delay
• IMC-PID
• Linear control theory
• Link utilization
• Network dynamics
• Packet-drop probability
• PID controllers
• Strong stability
• Tuning parameter

Considering the network dynamics, the congestion controllers designed according to the linear control theory may aggravate the oscillation of buffer occupancy and cause the degradation of bandwidth utilization, to solve the problem, the transfer function of TCP/AQM control process was studied, the relationship between buffer occupancy and packet drop probability was analyzed, and then the proper parameters of PID were calculated using the buffer occupancy and packet drop probability measured in the router. A congestion controller called APID which can tuning parameters adaptively according to the network dynamic was proposed. The simulation results show that the APID can tune the parameters of PID controller adaptively, and consequently achieves strong stability in buffer occupancy and high link utilization. It outperforms the PI, REM, IMC-PID, LRED and AOPC in terms of buffer stability and link utilization in different end-to-end delay scenarios.

• 出版日期2012-11
• 单位中南大学; 武汉科技大学