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针对IEEE802.15.4/Zigbee中信标使能模式,详细阐述了簇树拓扑结构的应用,并提出了单信标周期信标帧调度机制。重点讨论了时间窗口作为单一信标周期,以自由竞争方式,在超帧起始时刻发送信标。各协调器通过选择自由竞争时隙(CFTS)来确定发送时间偏移量,以避免与邻居信标帧碰撞。这种方法的优点是,不同簇在同一时刻进入激活期,因此临近节点间可直接通信,且无占空比要求。该方法的可行性已通过作者自己的IEEE802.15.4/Zigbee协议实验台得到验证。
According to IEEE 802.15.4 / Zigbee middlebeacon enabling mode, the application of cluster tree topology is described in detail, and a single beacon periodic beacon frame scheduling mechanism is proposed. Focus on the time window as a single beacon period, in a free competitive manner, at the beginning of the superframe to send beacons. Each coordinator determines the transmission time offset by selecting a free contention slot (CFTS) to avoid collisions with neighbor beacon frames. The advantage of this approach is that different clusters enter the active phase at the same time so that there is direct communication between adjacent nodes and no duty cycle requirements. The feasibility of this method has been verified by the author’s own IEEE802.15.4 / Zigbee protocol test bench.