]. SCTP adopts the similar congestion control mechanism of TCP, selective acknowledgement fast retransmission and rapid recovery. SCTP distribution a transmission sequencenumber to each data fragmentation in the sender, however it send the selective acknowledgement (SACK) frame to each successful received data partition in the receiver. When data message SACK frame detection the number of lost packet reach four times, overtime slow starting valve value of transmission timer in the sender and the size of the congestion window as shown the formula: