中文摘要：

协作通信技术的应用给无线网络媒体接人控制（mediaaccesscontrol，MAC）协议设计带来新的挑战。针对该协作通信技术的特点，文章在RBAR速率自适应协议的基础上，提出一种支持协作通信技术的MAC协议Coop-RBAR。Coop-RBAR协议根据发送端、协作节点和接收端之间的瞬时信道状态来决定数据传输方式和传输速率；基于系统能达到的最大吞吐量和邀请帧退避算法，选择最优的协作节点参与数据传输。仿真结果表明，Coop-RBAR协议能够有效地提高网络性能，可获得比RBAR协议更高的吞吐量和更小的传输时延。

英文摘要：

The application of cooperative communication technology introduces new challenges to media access control（MAC） protocol design. According to the characteristics of cooperative communication, a cooperative MAC protocol is proposed on the basis of RBAR, called Coop-RBAR. Coop-RBAR uses joint feedback of instantaneous channel state information from both the sender and the receiver as well as the relay node to select data transfer mode and data rate; the most capable relay node is chosen de- pending on the max throughput and the invitation frame backoff algorithm. The simulation results show that Coop-RBAR can effectively enhance the network performance, it outperforms RBAR in terms of throughDut and end-to-end delay.