  To develop low latency congestion control algorithm for real time taffic has
been gained attention recently. RTP Media Congestion Avoidance Techniques
(RMCAT) working group was initiated for standard defination. There are three
algorithms under this group, Network Assisted Dynamic Adaptation (NADA)
proposed by Cisco, Google Congestion Control (GCC) proposed by Google and
Self-Clocked Rate Adaptation for Multimedia(SCReAM) proposed by Ericsson. This
paper compares and analyses the performance of these algorithms on simulation
environment. Results show GCC has well fairness property and performs well in
lossy link but slow convergence in dynamic link, NADA stabilizes its rate
quickly but suffers "late-comer" effect, SCReAM has the lowest queue occupation
but also lower link capacity utilization.
