5G 的网络架构和业务特征相对于 3G/4G 时代出现了较大变化，对 5G 承载
网提出了挑战性的需求。针对大带宽、超低时延、高可靠、高精度同步、灵活性、网
络切片、智能协同等七大特征，探讨了 5G 承载技术方案，涵盖前传、中传和回传承
载方案，并分别对应有源天线单元（AAU）和分布单元（DU）之间，DU 和集中单元
（CU）之间，以及 CU 和核心网之间的通信承载。(Comparing with 3G/4G, 5G network architecture and service characteristics have changed great|y, which brings cha||enging requirements for 5G bearing network. |n this paper, seven features of 5G are proposed, such as wide bandwidth, u|tra |ow |atency, high re|iabi|ity, high-precision synchronization, f|exibi|ity, network section, and inte||igent cooperation. And 5G bearing technica| proposa|s are a|so discussed, inc|uding fronthau|, midd|ehau| and backhau| which correspond to the bearing network between active antenna unit (AAU) and distributed unit (DU), the bearing network between DU and centra|ized unit (CU), and the bearing network between CU and core network)