The major source of information about network congestion level is the receiver’s estimate of packet loss rate, which is included in TCP-Friendly Rate Control (TFRC) [1] feedback packets.
References
[1] S. Floyd, M. Handley, J. Padhye, and J. Widmer, “TCP Friendly Rate
Control (TFRC): Protocol Specification (Proposed Standard),” 2008.
[Online]. Available: https://tools.ietf.org/html/rfc5348
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