关键词: 5G, 物联网, 低功耗大连接, 低时延高可靠

Abstract:

Mobile Internet and Internet of things (IoT) are two major driving forces for the future development of mobile communications and will provide broad prospects for 5G.IoT expands the range of mobile communications services,evolving from “Internet of people” to “Internet of everything”.5G IoT scenarios include low-power massive-connections and low-latency high-reliability.Low-power massive-connections scenario has the characteristics of small data packets,low power consumption,mass connections.It not only requires the network to have the ability to support over a hundred billion connections,but also ensures the terminal’s ultra-low power consumption and ultra-low cost.Low-latency high-reliability scenario is primarily for applications,such as Internet of vehicle,autonomous driving,industrial control and remote medical.Such applications requires extremely high requirements on latency and reliability.They require to provide millisecond-level end-to-end latency and be close to 100% service reliability.Firstly,the technologies for low-power massive-connections scenario were introduced,including LoRa (long range wide area network) and SigFox operating on unlicensed spectrum and EC-GSM (extended coverage-GSM),LTE-M and NB-IoT (narrow band Internet of things) operating on licensed spectrum.Then,an overview of service requirements and performance metrics for ultra-reliable low latency communications was presented.Finally,the development of ITS (intelligent transport system) technologies for both 3GPP V2X (vehicle-to-everything) and IEEE DSRC (dedicated short range communication) standards was described.

Key words: 5G, Internet of things, low-power massive-connections, low-latency high-reliability