The IEEE 802.15.4 TSCH standard is designed to improve the reliability, timeliness, and energy efficiency of short-range wireless communications in industrial applications. TSCH relies upon a network formation process to efficiently create and maintain a synchronized reliable mesh network. The standard adopts a purely passive scan mechanism enabling joining nodes to listen to periodic Enhanced Beacons (EBs) in order to locate a TSCH network and associate to it. Nevertheless, the standard defines neither the advertisement strategy nor the rate at which the EBs should be sent. Consequently, long (re)association times might be observed, which postpones the proper functioning of the network and might have devastating consequences on the industrial application. In this paper, we propose a Fast and Active Network formation scheme (FAN) that leans on active scan procedures and Trickled beacon advertising strategies to accelerate the (re)association process. To do so, FAN equips joiners with a collision avoidance mechanism and allows them to initiate EB requests, on free channels, to trigger EBs. FAN is implemented in Contiki and evaluated through extensive realistic simulations and public testbed experiments. Obtained results assert the robustness of FAN compared to state-of-the-art solutions in terms of association times and overhead.

IEEE 802.15.4 TSCH标准旨在提高工业应用中短距离无线通信的可靠性，及时性和能效。TSCH依靠网络形成过程来有效地创建和维护同步的可靠网状网络。该标准采用了纯粹的被动扫描机制，使加入的节点能够侦听周期性的增强型信标（EB），以便定位TSCH网络并与之关联。但是，该标准既未定义广告策略，也未定义EB的发送速率。因此，可能会观察到较长的（重新）关联时间，这会延迟网络的正常运行，并可能对工业应用造成毁灭性的后果。在本文中，我们提出了一种快速主动网络形成方案（FAN），该方案依靠主动扫描程序和Trickled信标广告策略来加快（重新）关联过程。为此，FAN为连接器配备了避免冲突机制，并允许他们在自由通道上发起EB请求以触发EB。FAN在Contiki中实施，并通过广泛的逼真的模拟和公共测试平台实验进行了评估。与关联的时间和开销相比，获得的结果证明了FAN与最新解决方案相比的鲁棒性。FAN在Contiki中实施，并通过广泛的逼真的模拟和公共测试平台实验进行了评估。与关联的时间和开销相比，获得的结果证明了FAN与最新解决方案相比的鲁棒性。FAN在Contiki中实施，并通过广泛的逼真的模拟和公共测试平台实验进行了评估。与关联的时间和开销相比，获得的结果证明了FAN与最新解决方案相比的鲁棒性。