Node periodically samples its queue occupancy and the packet rates of its upstream neighbors, and infers whether congestion will occur in the current time interval.

• 拥塞节点的上游节点收到拥塞反馈后根据自身缓冲队列的使用情况来降低速率，此拥塞节点同时向其下游节点申请提高发送速率；