基于IEEE 802.15.6的无线体域网自适应MAC协议

针对无线体域网MAC协议自适应性不高且能效低的问题，提出一种基于IEEE 802.15.6的无线体域网自适应MAC协议（A-MAC）。对IEEE 802.15.6的超帧结构进行改进，竞争接入阶段和非竞争接入阶段的长度根据产生各优先级数据的节点所占的比例进行调整。竞争接入阶段又被划分为三个子阶段，子阶段的长度根据数据优先级情况进行动态调整。所有节点在竞争接入阶段按照信道接入策略竞争接入信道。最后仿真结果表明，在吞吐量、能耗和网络时延方面，使用A-MAC协议的网络性能明显优于使用IEEE 802.15.6 MAC和CA-MAC协议的网络性能。

Adaptive MAC protocol based on IEEE 802.15.6 for wireless body area networks

Aiming at the problem of low adaptability and low energy efficiency of MAC protocol of the wireless body area network, this paper proposed an adaptive MAC protocol based on IEEE 802.15.6 for WBAN(A-MAC). The protocol improved the superframe structure of IEEE 802.15.6, and adjusted the lengths of the contention phase and the non-contention access phase according to the proportion of nodes generating each priority data. It further divided the contention access phase into three sub-phases, and dynamically adjusted the length of the sub-phase according to the data priority. All nodes were competed for access channels in accordance with the channel access policy during the contention access phase. Finally, the simulation results show that the network performance using A-MAC protocol is significantly better than the network performance using IEEE 802.15.6 MAC and CA-MAC protocol in terms of throughput, power consumption and network delay.