TCP Congestion Control Concept (1)


Primary concept
TCP can not know the network condition exactly.
TCP regards ALL packet losses as congestion.

Transmission control with simple algorithms.
If packets are NOT lost.. 
TCP thinks network is NOT congested → Increases transfer rate.
If packets are lost.. 
TCP thinks network is congested → Decreases transfer rate.
                  ↓
TCP increases transfer rate until packet loss occurs.
TCP tries to know the limit of the network by causing packet loss.