中文摘要：

在通信系统迅猛发展的今天,为了满足爆炸式增长的移动业务和数据量需求,超高密度网络（UDN）作为有效改善网络吞吐量与资源利用效率的有效手段,已经成为第五代移动通信中的关键技术.网络节点的密集分布在干扰抑制、能量消耗、移动性管理等方面为通信系统带来了新的挑战,更优化的资源分配与网络选择策略.分布式算法设计以及UDN建模等研究都取得了长足进展.首先对UDN的基本架构和特点进行了简要介绍,重点分类和归纳整理了UDN技术研究中的最新成果,最后对该技术的发展趋势进行了展望,试图勾画出一个较为全面和清晰的概貌.

英文摘要：

Ultra dense networks（ UDN） has been dealt as a core technology in the fifth generation of communication for its excellent performance on enhancing the network throughput and spectrum efficiency.Densely deployed nodes have brought new challenges to the communication systems in the aspects of interference suppression,energy consumption,mobility management and so on. The new challenges in turn have promoted a considerable progress in resource allocation,network selection strategy and network modeling techniquesin UDN study. We first introduce the basic framework of the UDN and features. Moreover,we focus on classification of the UDN technology research in the latest works,and finally the technology trends were discussed for a more comprehensive and clear out view in this field.