说明：  在探讨D2D 对通信技术未来发展的导向作用基础上，明确了影响D2D 系统设计的多个因素，即D2D 设 备发现、资源分配、缓存技术、D2D-MIMO。从而勾画出基于D2D 技术的光纤前传和软件定义网络实现数据/控制分离的扁平化5G 架构，提出负责接入的下层宏/小基站蜂窝网和负责管理的上层网络云的管理机制。将D2D技术、SDN 技术、边缘计算和物联网技术等关键技术引入未来移动通信网络已经成为研究领域的热点，针对与之相关的、未来大规模网络的移动性、QoS 和大数据特性进行了讨论。
(On the basis of discussing the guiding role of D2D in the future development of communication technology, this paper makes clear the factors influencing the design of D2D system, namely D2D hypothesis Standby discovery, resource allocation, caching techniques, d2d-mimo.Thus, the flat 5G architecture for data/control separation is outlined based on D2D technology of optical fiber prepreel and software-defined network, and the management mechanism of the lower macro/small base station cellular network responsible for access and the upper network cloud responsible for management is proposed.The introduction of D2D technology, SDN technology, edge computing and Internet of things into the future mobile communication network has become a hot topic in the research field.)