In this paper, we propose an enhanced preamble based media access control mechanism (E-PMAC), which can be applied in power line communication (PLC) network for Industrial Internet of Things (IIoT). We introduce detailed technologies used in E-PMAC, including delay calibration mechanism, preamble design, and slot allocation algorithm. With these technologies, E-PMAC is more robust than existing preamble based MAC mechanism (P-MAC). Besides, we analyze the disadvantage of P-MAC in multi-layer networking and design the networking process of E-PMAC to accelerate networking process. We analyze the complexity of networking process in P-MAC and E-PMAC and prove that E-PMAC has lower complexity than P-MAC. Finally, we simulate the single-layer networking and multi-layer networking of E-PMAC, P-MAC, and existing PLC protocol, i.e. , IEEE1901.1. The simulation results indicate that E-PMAC spends much less time in networking than IEEE1901.1 and P-MAC. Finally, with our work, a PLC network based on E-PMAC mechanism can be realized.

翻译：在本文中,我们建议加强基于序言的媒体出入控制机制(E-PMAC),这一机制可适用于工业用物互联网(IIoT)的电线通信网络(PLC),我们采用在E-PMAC中使用的详细技术,包括延迟校准机制、序言设计和位置分配算法,利用这些技术,E-PMAC比现有的基于序言的MAC机制(P-MAC)更强有力。此外,我们分析P-MAC在多层次联网中的劣势,并设计E-PMAC的联网进程,以加快联网进程。我们分析了P-MAC和E-PMAC的联网进程的复杂性,并证明EE1901.1和P-MAC的联网进程比P-MAC的复杂程度要低。最后,我们模拟了E-PMAC、P-MAC、P-MAC和现有的PLC协议的单层联网和多层网络,即IEEE1901.1。模拟结果表明,E-PAC在联网上花费的时间比IE1901.1和P-MAC的网络要少得多。最后,通过我们的工作可以实现以E-PMAC机制为基础的PLC网络。