Congestion in wireless networks may result in packet drops or delay delivery of important information staying in the cache. CA-OSMA (Opportunistic packet Scheduling and Media Access Control with congestion aware) protocol proposed in this paper, first introduce a new metric to qualify the congestion level, which takes buffer occupancy, packet loss and excessive MAC contention together into account. Then, a new protocol taking advantages of multi-user diversity is proposed to migrate congestion and further improve the fairness of channel access. Compared with end-to-end TCP congestion control, the total delay decreases and the reliability raises in this hop-by-hop control. It benefits more for the networks with severe loads especially the backlogged network.