For the purpose of improving to redundancy of the transmission path, compensating for poor communication quality of wireless communication in harsh industrial environments and partly improving reliability of industrial wireless networked control system (WNCS), the multi-path transmission mechanism based on topology of dual-band and secondary structure is proposed. The topology of dual-band and secondary structure allows use of independent frequency bands to communication on devices and communication controllers. So as to diminish the chance of conflict and the effective use of space capacity to work in parallel. It partly eased real-time problems on wireless communication technology in industrial environment. At the same time, we introduce to DS-UWB in WNCS firstly. The project of PROFIBUS integrated with UWB are designed on the multi path transmission mechanism based on topology of dual-band and secondary structure. It provides an effective application way of the multi-path transmission mechanism.Keywords-multi-path transmission mechanism; topology of dual-band and secondary structure; industrial wireless network;I. Low-frequency occupy 3.1 � 5.15GHz spectrum and can transmit data rate at 2S.5 Mbitls � 400Mbitls. High frequency occupy 5.S25�1O.6GHz spectrum and can transmit data rate at 57�SOOMbitis. Two bands can be used simultaneously to achieve high-speed data transmission at 1.2Gbitls. According to data transmission and power demand in the different frequency bands in the DS-UWB program as shown in table 1 and table 2. We use low-frequency as work band of communication controller, because transmission distance is very suitable at low-frequency and it is suitable for communication between the communication controllers. Despite the relatively low data rate, but it is enough to meet the present stage of industrial networked control systems.We use high-frequency as work band of between the field devices, as field device is greater number and denser than communications controller. While high-frequency is wider and larger capacity than low-frequency, and can better meet communication requirements of field devices. We use low-frequency band at 3.1 GHz � 4.S5GHz, high-frequency band at 6.2GHz � 9.7GHz. Each band can support up to six piconet channel. DS-UWB technology enables communication between devices and communications controller at independent frequency band, reducing the chance of conflict. It partly eased real-time problems on wireless communication technology in the harsh industrial environment.Can be seen, DS-UWB technology can be effectively addressed communication controller while working in dual band problems that is proposed in multi-path transmission mechanism based on topology of dual-band and secondary structure. The project of PROFIBUS integrated with UWB are designed based on the structure at next section.
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