5G承载的挑战与技术方案探讨

[摘要] 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。

[关键词] 5G；承载；前传；中传；回传

[Abstract] Comparing with 3G/4G, 5G network architecture and service characteristics have changed greatly, which brings challenging requirements for 5G bearing network. In this paper, seven features of 5G are proposed, such as wide bandwidth, ultra low latency, high reliability, high-precision synchronization, flexibility, network section, and intelligent cooperation. And 5G bearing technical proposals are also discussed, including fronthaul, middlehaul and backhaul which correspond to the bearing network between active antenna unit (AAU) and distributed unit (DU), the bearing network between DU and centralized unit (CU), and the bearing network between CU and core network.

[Keywords] 5G; bearing network; fronthaul; middlehaul; backhaul