A new unicast rate-based TCP-Friendly protocol called RAAR (Rate Adaptation at Receivers) is proposed.RAAR is a rate adaptive algorithm at receivers.It applies GAIMD (General Additive Increase Multiplicative Decrease) policy for congestion control and doesn't need to feed back per packet received.In RAAR

almost all complex operations of traffic control are carried out at receivers.A simple mathematical model is constructed to analyze the throughput of RAAR and get the relationship of α and β in RAAR for AIMD(Additive Increase Multiplicative Decrease)TCP-Friendly congestion control.Comparing with two important TCP-Friendly protocols

TFRC and TEAR

results are that RAAR has better performance in TCP-Friendliness

intra-protocol fairness and smoothness.RAAR is also a promising avenue of development for congestion control of multicast traffic

since it is not a per-packet acknowledgement and is mainly implemented at receivers.