5G时代光传送网技术白皮书1目录1引言..........................................................................................................................................325G技术发展及承载需求........................................................................................................42.15G新业务的关键性能需求............................................................................................42.25GRAN架构的演进趋势...............................................................................................52.35G核心网架构的演进趋势............................................................................................62.3.1核心网架构的云化和下移.......................................................................................62.3.2核心网云化数据中心的互联...................................................................................82.45G承载网需求分析........................................................................................................92.4.1大带宽需求...