随着第四代移动通信系统（The fourth generation mobile communication system ，4G）长期演进技术（Long term evolution ，LTE）在全球商用的成功展开和移动数据的爆发式增长，对第五代移动通信系统（The fifth generation mobile communication system ，5G）的研发提上日程。本文首先分析了5G发展的两个驱动力，介绍了国际电联（International telecommunication union ，ITU）对5G标准化的规划和最新进展，总结了通信业界与学术界公认的5G关键技术，并对其中的无线网络相关技术，超密集蜂窝（Ultra dense cellular network ，UDN）和集中式蜂窝架构的研究进行了深入的分析介绍。最后总结了5G的发展趋势和未来的研究动向。%As the long term evolution (LTE) of the fourth generation mobile communication system (4G) is successfully commercialized globally and mobile data are increased explosively ,the research and devel‐opment on the fifth generation of mobile communication system (5G) become the focus of both industry and academia .Here ,the two drivers to develop 5G are firstly analyzed .Then the international telecom‐munication union(ITU) timeline for global standardization of 5G is presented and the most recent updates are described .Subsequently ,widely recognized key technologies for 5G are presented .Specifically ,key wireless network technologies ,including the ultra dense cellular network (UDN ) and the centralized ra‐dio access network ,are described in detail .Finally ,conclusions are drawn and open problems are dis‐cussed .
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