Approaches towards congestion control

End-end congestion control:

• no explicit feedback from network

• congestion inferred from end-system observed loss, delay

• approach taken by TCP

Network-assisted congestion control:

• routers provide feedback to end systems

  • single bit indicating congestion (SNA, DECbit, TCP/IP ECN, ATM)
  • explicit rate sender should send at

Two broad approaches towards congestion control:

Previous slide

Next slide

Back to first slide

View graphic version