Congestion Control Algorithms Sample Clauses

Congestion Control Algorithms. The process of congestion control is a main function in TCP as well as MPTCP. However, it is more important in MPTCP [16] [52]. To understand the importance of congestion control, let us consider a network with a number of nodes and a number of links. Assuming some of these links have a limited capacity, they become bottlenecks in the network. When multiple sources generate their data flows, multiple flows of data may share a bottleneck link. Hence, this link becomes congested and data packets are delayed or even dropped. Consequently, many source(s) do not receive an acknowledgement (ACK) within the Retransmission Time-Out (RTO) interval. In the absence of a Congestion Control algorithm, these sources retransmit their data packets, causing further congestion. On the other hand, with a proper Congestion Control algorithm, these sources realize that there is congestion, reduce their own data rate and alleviate further congestion. Congestion is typically controlled by adjusting the congestion window (denoted as CWND). The CWND is increased when ACK is received for a packet, and decreased when a packet is lost. The most widely used method for CWND update is the Additive Increase Multiplicative Decrease (AIMD) principle as follows [16] [52]: when ACK is received (Additive increase) (2.1)  βw when packet is lost (Multiplicative decrease) where w denotes the congestion window size. In the NewReno (a name for a congestion control algorithm) single-path TCP version, the parameters α and β take values α = 1 and β = 0.5 [53]. The NewReno congestion control algorithm is a single-path TCP congestion control that responds to ‘partial acknowledgement’. 18 Mbps MPTCP TCP 6 Mbps TCP 12 Mbps MPTCP 6 Mbps TCP MPTCP TCP 4 Mbps (a) 12 Mbps
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