CWNDCongestion Window
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If the time is expired then we need to use retransmission mechanism and restart the slow start phase by setting the CWND to value 1.
If not then decrees CWND by one value and recheck the bandwidth.
Final, if all above comparisons did not meet, then CWND need to be fixed.
However, in case the time out is expired even there is no congestion then we need to reset the ssthresh and make the CWND equal to one.