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针对无线体域网需要在2.4 GHz频段具有复杂干扰环境下可靠工作,且需要尽可能降低功耗的问题.提出一种低功耗多频道介质访问控制(MAC)协议:MCE-MAC.在本协议中,节点使用星型拓扑连接;其工作频道随时间变化快速切换.并提出了自适应超帧频率控制机制,控制节点占空比降低网络能耗;另外,在工作中对无线频道进行感知,动态调整其使用的频道,提高传输可靠性.在基于TI的CC2530平台上实现了MCE-MAC,实验证明,在单频道的MAC协议极大的受到干扰影响的情况下,本文提出的MCE-MAC的数据传输成功率和传输时延不受干扰影响;相较于EM-MAC协议,其传输时延显著优于EMM AC且功耗仅为其15%左右.
Aiming at the problem that wireless body-area network needs to work reliably under the condition of complex interference in the 2.4 GHz band and the power consumption needs to be minimized, a low-power multi-channel medium access control (MAC) protocol is proposed: MCE-MAC In the protocol, nodes are connected by a star topology, and their working channels are rapidly switched over time. An adaptive super-frame frequency control mechanism is proposed to control the node duty cycle and reduce the network energy consumption. In addition, perception of wireless channels , And dynamically adjust the channels it uses to improve the transmission reliability.MCE-MAC is implemented on the CC2530 platform based on TI, and the experiment proves that under the condition that single-channel MAC protocol is greatly affected by interference, the proposed MCE- The data transmission success rate and transmission delay of the MAC are not affected by the interference. Compared with the EM-MAC protocol, the transmission delay of the MAC is significantly better than that of the EMM AC and the power consumption is only about 15%.