基于PON的超低时延技术方案探讨  

Discussion on Ultra Low Delay Technology Scheme based on PON

作　　者：刘启芳[1] 张宇 周泉[1] LIU Qifang;ZHANG Yu;ZHOU Quan(Wuhan FiberHome Technical Services Co.,Ltd.,FiberHome Telecommunication Technologies Co.,Ltd.,Wuhan 430074,China)

机构地区：[1]烽火通信科技股份有限公司武汉烽火技术服务有限公司,武汉430074

出　　处：《光通信研究》2024年第1期85-89,共5页Study on Optical Communications

摘　　要：【目的】随着各种互联网新兴业务的崛起以及无源光网络(PON)在行业应用场景的延伸,作为第五代固定网络(F5G)代表技术的PON,需要不断演进升级才能满足未来网络的需求。其中,PON的时延是迫切要改善的关键网络性能指标,故文章对PON的低时延技术进行了深入研究。【方法】文章首先总结了当下PON在低时延方面所面临的挑战,分析了导致PON时延较高的主要原因有两个,分别是因光网络单元(ONU)带宽分配机制引入的上行固有时延和因ONU注册/测距机制引入的上行随机时延。因此,文章提出了基于单帧多突发技术和独立注册通道技术的两种超低时延技术方案,并进行实验验证分析。【结果】通过验证分析,对于单帧多突发技术的低时延技术方案,结合时延和带宽利用率两个性能指标综合来看,1/4调度周期表现最优,但会牺牲小部分带宽,比较适合传输对时延敏感而带宽不敏感的业务;对于独立注册通道技术的低时延技术方案,由于引入了额外的波长用于ONU注册/测距通道,可以完全消除正常业务通道因注册/测距的静默窗口引入的额外时延和抖动。【结论】综合而言,文章所探讨的基于PON的超低时延技术方案,可以有效降低PON的时延,有助于促进虚拟现实(VR)类等新兴业务的规模商用和工业互联网的快速发展。【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 random uplink delay introduced by the ONU registration/ranging mechanism.Therefore,this article proposes two ultra-low latency technology solutions based on single frame multi burst technology and independent registration channel technology,and conducts 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 quarter scheduling cycle performs the best.However,it sacrifices a small portion of bandwidth,making it more suitable for transmitting services that are sensitive to time delay but not bandwidth sensitive.For the low latency technology scheme of independent 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 business channels.【Conclusion】Overall,the ultra-low latency technology solution based on PON discussed in this article can effectively reduce the latency of PON networks,and help promote the large-scale commercializ

关 键 词：无源光网络 超低时延技术 虚拟现实 工业互联网 

分 类 号：TN915.6[电子电信—通信与信息系统]