RT-SAD: Real-Time Sketch-Based Adaptive DDoS Detection for ISP Network

Algorithm 3

Parameter value α update algorithm.

	Input: Current residual res, Historical residual sequence res_list, , , ,
	Output:
(1)	if res > then
(2)	if < then
(3)	=  +
(4)	end if
(5)	else if res < then
(6)	if > then
(7)	=  −
(8)	end if
(9)	end if