针对NCAC-MAC协议在选择中继节点时存在碰撞和中继节点中待转发数据帧的目的节点使用随机线性网络编码的解码方法可能不能对编码帧进行成功解码的问题,提出一种基于编码感知的完全无碰撞协作MAC协议(NCAC-WTC).该协议主要提出两个改进机制:一是完全无碰撞中继节点选择机制,使用目的节点最终选择唯一中继节点,保证中继候选节点在竞争中继节点及编码重传的过程中做到完全无碰撞;另一个是自适应解码机制,使目的节点能根据链路信息自适应地选择解码方法对编码数据帧进行解码,提高目的节点对编码数据帧的解码效率和成功率.仿真结果表明:与NCAC-MAC和Phoenix等已有协议相比,NCACWTC协议有效地减小了平均端到端时延,提高了网络吞吐量和数据帧投递成功率,且使数据帧投递成功率稳定在95.5%. Aiming at the problem that the destination node of the collision and the data frame to be forwarded in the relay node when the NCAC-MAC protocol selects the relay node may not be able to successfully decode the encoded frame by using the decoding method of the random linear network coding, a method based on coding perception (NCAC-WTC) .This protocol mainly proposes two improvement mechanisms: one is the collision-free relay node selection mechanism, and finally the destination node selects the only relay node to ensure that the relay candidate node is in competition Relay node and coding retransmission in the process of complete collision-free; the other is adaptive decoding mechanism, so that the destination node can adaptively select the decoding method based on the link information to decode the encoded data frame to improve the purpose of the node coding The simulation results show that NCACWTC protocol can effectively reduce the average end-to-end delay and improve the network throughput and data frame delivery compared with the existing protocols such as NCAC-MAC and Phoenix Rate, and the data frame delivery success rate stabilized at 95.5%.