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.
关键词
电力物联网通信/电力业务/可靠性/时延性/系统设计
Key words
power Internet-of-thing communications/power services/reliability/latency/system design
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