一种应用干扰消除进行冲突消解的分布式无线MAC协议

Distributed Collision-resolvable MAC Protocol for Wireless LANs with Interference Cancellation Support

媒介接入控制(MAC)用以协调无线节点对公共信道的共享,对无线网络性能有至关重要的影响。传统的MAC协议只能抑制冲突,不能根除及处理冲突。提出了一种基于已知干扰消除技术的新型消解冲突方法,并以此为基础设计了一个全新的MAC协议——CR-MAC。在CR-MAC协议中,无线接入点(AP)通过将部分报文传输与已知干扰消除相结合来解码冲突所包含的所有报文。因此发生冲突的报文传输过程能够被充分利用,且所需的报文重传减少了。实验结果表明,在网络吞吐率及预期报文时延指标上,CR-MAC协议较普遍采用的IEEE 802.11DCF协议均有明显优势。

Medium access control is critical to wireless network performance.We introduced a novel collision resolution method based on known interference cancellation,and proposed a new MAC protocol named as CR-MAC.Basically,AP tries to decode all the data packets in a collision by combining partial retransmissions and known interference cancellation.Hence,the collided transmission can be fully utilized,and less retransmission is required.The simulation results show that CR-MAC performs much better than IEEE 802.11 DCF in terms of both the aggregation throughput and the expected packet delay under various network settings.