分层异构无线网络的协议架构和关键技术

摘要

分层异构无线网络技术因其可以有效提高网络频谱效率、满足不同热点覆盖需求、大幅提升系统容量等优点,而成为当今LTE-Advanced系统中的关键技术之一.总结了分层异构无线网络的背景、定义以及架构,并重点讨论了由于传统网络拓扑结构的改变而引发的干扰问题,详述了3GPP标准中的增强干扰协调方案,最后分析了分层异构无线网络中的其他关键技术,如网络自组织、回程链路设计、小区选择和切换、节能、认知无线电技术等.这些关键技术对于分层异构无线网络商用化部署具有指导意义.%Heterogeneous network (HetNet) is recently becoming one of the key technologies in LTE-Advanced network,because it can significantly improve spectrum efficiency and system capacity,while meeting different requirements for coverage in hotspots.The research background,term definitions and system architecture of HetNet were detailed.Furthermore,the interference problem caused by the variation in network topology,and the schemes for enhanced inter cell interference coordination (eICIC) in the 3rd generation partnership project (3GPP) standardization were focused on.Lastly,other key technologies in HetNet were also analyzed,such as self-organized network (SON),backhaul link design,mobility management,energy saving and cognitive radio,etc.Resolutions of those aforementioned key technologies have profound guiding significance for the commercial deployment of HetNet.