[Objective]With the rise of various emerging internet businesses and the extension of Passive Optical Network(PON)application scenarios in the industry,PON technology,as the representative technology of the 5th Generation Fixed Networks(F5G),needs to evolve and upgrade continuously to meet the needs of the future network.Among them,the latency of PON networks is a key network performance indicator that urgently needs improvement.Therefore,this article conducts an in-depth research on the low latency technology in the PON networks.[Methods]This article first summarizes the challenges faced by current PON networks in terms of low latency,and analyzes two main reasons for the high latency of PON networks,namely the inherent uplink delay introduced by the Optical Network Unit(ONU)bandwidth allocation mechanism and the ran-dom uplink delay introduced by the ONU registration/ranging mechanism.Therefore,this article proposes two ultra-low laten-cy technology solutions based on single frame multi burst technology and independent registration channel technology,and con-ducts experimental verification and analysis.[Results]Through verification and analysis,for the low latency technology solution of single frame multi burst technology,combined with two performance indicators of latency and bandwidth utilization,a quar-ter scheduling cycle performs the best.However,it sacrifices a small portion of bandwidth,making it more suitable for trans-mitting services that are sensitive to time delay but not bandwidth sensitive.For the low latency technology scheme of inde-pendent registration channel technology,the introduction of an additional wavelength for ONU registration/ranging channels can completely eliminate the additional delay and jitter introduced by the silent window of registration/ranging in normal busi-ness channels.[Conclusion]Overall,the ultra-low latency technology solution based on PON discussed in this article can effec-tively reduce the latency of PON networks,and help promote the large-scale commercialization of emerging businesses such as Virtual Reality(VR)and the rapid development of industrial internet.
关键词
无源光网络/超低时延技术/虚拟现实/工业互联网
Key words
PON/ultra-low delay technology/VR/industrial internet
维普
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