5G时代光传送网技术白皮书 1 目 录 1 引言 ................................ ................................ ................................ ................................ .......... 3 2 5G技术发展及承载需求 ................................ ................................ ................................ ........ 4 2.1 5G新业务的关键性能需求 ................................ ................................ ............................ 4 2.2 5G RAN架构的演进趋势 ................................ ................................ ............................... 5 2.3 5G核心网架构的演进趋势 ................................ ................................ ............................ 6 2.3.1 核心网架构的云化和下移 ................................ ................................ ....................... 6 2.3.2 核心网云化数据中心的 互联 ................................ ................................ ................... 8 2.4 5G承载网需求分析 ................................ ................................ ................................ ........ 9 2.4.1 大带宽需求 ................................ ................................ ................................ ............... 9 2.4.2 低时延需求 ................................ ................................ ................................ ............. 10 2.4.3 高精度时间同步需求 ................................ ................................ ............................. 11 2.4.4 灵活组网的需求 ................................ ................................ ................................ ..... 11 2.4.5 网络切片需求 ................................ ................................ ................................ ......... 12 3 面向 5G的光传送网承载方案 ................................ ................................ ............................. 14 3.1 5G前传承载方案 ................................ ................................ ................................ .......... 14 3.1.1 5G前传典型组网场景 ................................ ................................ .......................... 14 3.1.2 光纤直连方案 ................................ ................................ ................................ ......... 15 3.1.3 无源 WDM方案 ................................ ................................ ................................ .... 16 3.1.4 有源 WDM/OTN 方案 ................................ ................................ ......................... 18 3.1.5 5G前传承载方案小结 ................................ ................................ .......................... 19 3.2 5G中传/回传承载方案 ................................ ................................ ................................ . 19 3.2.1 中传/回传承载网络架构 ................................ ................................ ....................... 19 5G时代光传送网技术白皮书 2 3.2.2 网络切片承载方案 ................................ ................................ ................................ . 21 3.3 5G云化数据中心互联方案 ................................ ................................ .......................... 23 3.3.1 大型数据中心互联方案 ................................ ................................ ......................... 23 3.3.2 中小型数据中心互联方案 ................................ ................................ ..................... 23 3.4 5G光传送网承载方案小结 ................................ ................................ .......................... 24 4 5G时代的光传送网关键技术演进 ................................ ................................ ...................... 27 4.1 低成本大带宽传输技术 ................................ ................................ ................................ . 27 4.1.1 短距非相干技术 ................................ ................................ ................................ ..... 27 4.1.2 中长距低成本相干技术 ................................ ................................ ......................... 27 4.2 低时延传输与交换技术 ................................ ................................ ................................ . 28 4.2.1 ROADM 全光组网调度技术 ................................ .