TCP congestion control algorithm

Question

Mohmmad Abu Yousuf 2020-2-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/504548-tcp-congestion-control-algorithm

评论： Mohmmad Abu Yousuf 2020-2-16

Hi,

Is there anyone who could help me to have some suggestion regarding TCP congestion control algorithm. There have different types of TCP like Reno, Westood, Vegas, bandwidth and RTT detection based, Jersey etc. I do have idea about the slow start, congestion avoidance, fast retransmit and fast recovery phases which are the algorithms used in TCP. I know how these algorithms work but as I do not have very good hand on coding so I do not know how to code these algorithm by MATLAB. As well as I am not understanding how to start or from where to start. TCP works like,

Measures the Smoothed RTT,
increases/decreases congestion window based on the phases,
sets the slow start threshold

More specifically, if we take the link parameters like,

Data Rate (10 Mbps)
Propagation Delay (250 ms)
Loss Rate (1%)

Then,

How I can send a packet from source to destination dynamically?
How to receive acknowledgement to the sender? and
how to specify these packet sending and receiving time and record them accordingly?

Moreover, How can I specify a source node and destionation node based on who will do these packet transferring between them.

I got some idea about it but those are coded by 'C' as well as in 'NS-2' which is Linux based. It is quite tough for me to learn this linux based simulation now as it is my final year of graduation.

If anybody could assist me to start the coding, it would be a great help for me. Please help me out.

Thank you in advance.

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Walter Roberson 2020-2-13

Question is effectively duplicated by https://www.mathworks.com/matlabcentral/answers/505199-tcp-congestion-control-algorithm

Mohmmad Abu Yousuf 2020-2-15

yes. that one is also mine. I am removing one.

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Answer 1

Walter Roberson 2020-2-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/504548-tcp-congestion-control-algorithm#answer_415750

Is there anyone who could help me to have some suggestion regarding TCP congestion control algorithm.

A number of them are described at https://en.wikipedia.org/wiki/TCP_congestion_control

I know how these algorithms work but as I do not have very good hand on coding so I do not know how to code these algorithm by MATLAB.

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

If the question is whether MATLAB or its toolboxes provide any functions to make it easier to construct and send and receive raw packets, the answer is NO, with the exception that Simulink Real-Time ( not Simulink Real-Time Desktop) provides a way to construct raw packets.

If the question is whether MATLAB or its toolboxes provide any functions to make it easier to emulate TCP conversations and the effect of choosing one of those TCP Flow Control techniques, the answer is that

"SimEvents® provides a discrete-event simulation engine and component library for analyzing event-driven system models and optimizing performance characteristics such as latency, throughput, and packet loss. Queues, servers, switches, and other predefined blocks enable you to model routing, processing delays, and prioritization for scheduling and communication. "

Note that this is not part of the Communications Systems Toolbox, or the 5G Toolbox, or the USRP Support Package. An event/state simulator is, however, an appropriate tool for modeling how program state logic interacts.