Design and Analysis of 5G/6G Power Internet-of-thing Communications With High-reliability and Low-latency for Supporting New Type Power Systems

The collaborative control of source-grid-load-storage services in new power systems have the multiple requirements for information transmission including large-scale node access, bidirectional reliability and wide-area low latency, which is an important and vertical application scenario for 5G communications. However, the civilian 5G cannot fully meet the high-reliability and low-latency requirement of information transmission in collaborative control of power services. Based on the current 5G standard, subcarrier frequency-hopping (FH) is applied into the configurable orthogonal frequency division multiplex(OFDM) system in this paper, resulting in a new OFDM/FH scheme, which provides multiple access and high reliability transmission for "source-grid-load-storage" services. Meanwhile, thanks to the characteristics of the control service with short and burst packet, the OFDM/FH signal transmission is integrated with the mini-slot scheduling strategy of the 5G/6G network. The resource scheduling and retransmission mechanism based on the mini-slot can effectively reduce the transmission latency. Subsequently, with the theoretical analysis, the trade-off relation between transmission reliability and retransmission latency of the proposed power internet-of-things (IoT) communications system is derived. Through the design of 5G/6G network in the perspective of the signal processing in the physical layer and the slot scheduling in media access layer, the proposed OFDM/FH based on mini-slot scheduling can support the multi-service access of source-grid-load-storage, up to 99.999% transmission reliability and ms-level low latency. It successfully realizes the deep integration of 5G/6G ultra-reliability and low-latency communications(uRLLC) with ubiquitous control services in power grids.