Calculate congestion with TCP mechanism?

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Anatol Badach

Dear Abdelkader Mekkaoui,

the principle by which congestion in IP networks can be reduced is described by the Explicit Congestion Notification (ECN) protocol. The general concept of ECN was specified by the Internet Engineering Task Force (IETF) in the document RFC 31682.

My article (in German) at the address

https://www.researchgate.net/publication/301552951_ECN_Explicit_Congestion_Notification

illustrates the idea of ECN.

In order to reduce congestion, according to ECN, some information needs to be made in both the IP header and the TCP header.

Further sources of information can be found in my ICN presentation.

Best regards

Muhammad Mateen Yaqoob

To integrate TCP congestion control into the AOMDV protocol in NS2, follow these steps:

Packet Loss Detection:Monitor packet transmission between source and destination nodes. Detect packet loss events using TCP acknowledgment (ACK) mechanisms. Record the occurrence of packet loss as an indicator of network congestion along the route.

Throughput Measurement:Measure the throughput of data transmission along the route. Calculate the rate at which data is successfully delivered from the source to the destination. Use throughput as an indicator of network congestion, where decreasing throughput may signal congestion.

Round-Trip Time (RTT) Estimation:Estimate the round-trip time (RTT) between the source and destination nodes. Monitor the time taken for a packet to travel from the source to the destination and back. Use RTT as a parameter for congestion control algorithms to regulate packet transmission.

Congestion Window Adjustment:Adjust the congestion window size (cwnd) dynamically based on congestion signals. Increase cwnd during TCP slow start phase and decrease it during congestion avoidance phase. Use congestion window size as a mechanism to control the rate of packet transmission and alleviate congestion.

Slow Start Threshold (ssthresh) Management:Manage the slow start threshold (ssthresh) to regulate TCP congestion control behavior. Set ssthresh to control the transition between slow start and congestion avoidance phases. Adjust ssthresh based on congestion signals to prevent network congestion collapse.

Adaptive Congestion Control Algorithms:Implement adaptive TCP congestion control algorithms such as Tahoe, Reno, or New Reno. Use algorithm-specific mechanisms to adjust congestion control parameters dynamically in response to network congestion.