分层异构网中基于宏用户检测和干扰信道增益估计的干扰管理

To improve the spectrum efficiency of multi-tier heterogeneous networks, small cells need to access the busy frequency band of macro cells and manage the co-channel interference. Even though the access-probability-based methods have been proposed and widely used, their performance is not good enough. This is because they are based on the statistic information of the network. In this project, we intend to deal with the challenges on obtaining the instantaneous information of the network. Based this, we investigate the new methods that can substantially enhance the capability of the interference management. Specifically, we exploit the relationship between the type of the wireless services at the macro cell and the characteristic of the wireless signals. First, we study the interference-region-based detection method to identity the active macro users. Then, we investigate the estimation method to obtain the channel gain between the small cell base station and the active macro user. Finally, we design the effective interference management methods based on the detected and estimated instantaneous information. The results of this project are expected to enable the small cell to autonomously obtain the instantaneous information regarding the active macro user. Then, the small cell can effectively manage the interference and significantly improve the spectrum efficiency. This provides a new research direction for tiered heterogeneous networks in dense and high load scenarios.

为了提高分层异构网的频谱效率，小基站往往需要复用宏基站的忙碌频段，业界陆续提出了基于接入概率的干扰管理方法，但它们主要利用网络的统计信息，性能受到很大的制约。本项目拟解决获取层间瞬时信息的技术挑战，探索基于瞬时信息的干扰管理方法，从根本上提高同频异构的干扰管理水平。具体而言，本项目抓住宏基站服务类型与其发射信号特点之间的关系，首先研究基于干扰区域的活跃宏用户检测方法，然后研究获取小基站与活跃宏用户之间干扰信道增益的估计方法，最后基于检测估计的瞬时结果设计有效的干扰管理算法。本项目研究成果可以使小基站自主获取活跃宏用户的瞬时信息，进行有效的干扰管理，大幅度提升异构网的空间容量和频谱效率，为分层异构网在热点地区高负载环境下的发展开拓新的思路。

本项目研究同频分层异构网中，通过分析宏基站服务类型与其发射信号特点之间的关系，使得小基站可以检测活跃宏用户以及估计干扰信道增益，从而获得活跃宏用户在某一位置处的瞬时信息，在此基础上本项目获得了基于这些瞬时信息的干扰管理技术，使小基站可以有效复用宏基站的忙碌频段，提高整个异构网系统在热点地区、高密度、高负载环境下的空间容量，并且使小区的频谱复用率提高100%-300%。. 通过本项目的研究，我们获得了一套完整的理论体系和方案，用于解决宏基站用户和小基站用户进行同频同区域共存时的干扰信道增益估计和干扰管理方面的问题，主要研究成果为IEEE核心SCI期刊4篇(如TVT，TCOM，IEEE Sensors Journal)，IEEE主流国际会议EI论文5篇(如ICC ，Globecom，WCNC等)，申请国家发明专利3项，获得授权专利2项。因此，本项目的研究成果为同频异构网络的进一步发展提供了重要的理论基础。