信息通信技术与政策

信息通信技术与政策

信息通信技术与政策 ›› 2025, Vol. 51 ›› Issue (10): 92-96.doi: 10.12267/j.issn.2096-5931.2025.10.013

技术与标准 上一篇    

无源光网络低时延技术研究

Research on low latency technology of passive optical network

张晨, 杨跃强   

  1. 中国信息通信研究院技术与标准研究所, 北京 100191
  • 收稿日期:2025-09-09 出版日期:2025-10-25 发布日期:2025-11-06
  • 作者简介:
    张晨, 中国信息通信研究院技术与标准研究所宽带技术与业务研究部工程师,主要从事光接入网方面的研究工作
    杨跃强, 中国信息通信研究院技术与标准研究所宽带技术与业务研究部工程师,主要从事光接入网方面的研究工作

ZHANG Chen, YANG Yueqiang   

  1. Technology and Standards Research Institute, China Academy of Information and Communications Technology, Beijing 100191, China
  • Received:2025-09-09 Online:2025-10-25 Published:2025-11-06

摘要:

传统以“带宽提升”为技术发展思路的时分复用无源光网络(Time-Division Multiplexing Passive Optical Network,TDM-PON)已经不能满足一些低时延应用的需求,急需对无源光网络(Passive Optical Network,PON)低时延技术展开研究。首先对虚拟现实云计算/增强现实云计算、工业应用等场景的低时延需求进行阐述,然后分析无源光网络时延的构成,其时延问题主要来源于上行带宽分配机制和光网络单元(Optical Network Unit,ONU)注册/测距机制引入的上行随机时延。针对前者介绍了固定带宽分配、单帧多突发、协同动态带宽分配(Dynamic Bandwidth Allocation,DBA)等低时延关键技术;针对后者介绍了带外开窗、开小窗等低时延关键技术。

关键词: 无源光网络, 低时延, 单帧多突发, 协同DBA, 带外开窗

Abstract:

The traditional TDM PON technology, which focuses on “bandwidth enhancement,” can no longer meet the needs of some low latency applications, and there is an urgent need to conduct research on low latency technologies for PON networks. Firstly elaborates on the low latency requirements of cloud VR/AR, industrial applications, and other scenarios, and then analyzes the composition of PON network latency. The latency problem mainly comes from the uplink bandwidth allocation mechanism and the uplink random latency introduced by the ONU registration/ranging mechanism. Key low latency technologies such as fixed bandwidth allocation, single frame multi burst, and collaborative DBA were introduced for the former. Introduced low latency key technologies such as out of band window opening and small window opening for the latter.

Key words: passive optical network, low latency, single frame multi burst, collaborative DBA, out of band windowing

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