LTE-A异构网络中干扰协调技术的研究

发布时间：2018-04-30 11:31

本文选题：LTE-A + 异构网络　；参考：《南京邮电大学》2017年硕士论文

【摘要】：移动通信和互联网的快速发展,用户对于数据业务的需求日益增加,在这些业务中其中很大部分的业务是发生在室内的。由于室内存在着很大的穿墙损耗,为了提高用户的性能,LTE-A系统中引入了异构网络,即将宏基站与低功率节点组合的网络。虽然异构网络能够提高整个网络的容量,但是宏基站与低功率节点间的干扰问题却大大影响着用户的性能。为此3GPP组织提出了增强型小区间干扰协调技术,包括了几乎全空白子帧技术和RE偏置技术,大大提高了异构网络的性能。在现实场景中,Macro-Pico的异构网络场景是应用最广泛的,其存在的干扰问题也是比较复杂的。本文针对Macro-Pico的异构场景,分析了网络中主要的干扰问题,并对网络中的干扰问题进行了分析研究。具体的研究和创新如下。在Macro-Pico异构网络中,增强型小区间干扰协调技术主要采用基于ABS技术和RE偏置技术的时域干扰协调技术。本文对特定的Macro-Pico异构网络进行组网建模,分析了ABS子帧技术和RE偏置技术对网络中干扰的改善情况,并给出了比较合理的ABS模式和RE偏置值的范围。该分析工作对实际中网络情景的RE偏置值和ABS比例的设置有一定的参考意义。在采用了增强型小区间干扰协调技术的Macro-Pico异构网络中,Pico扩展区用户受到了Macro基站强烈的下行干扰。针对该问题,本文提出了将自适应天线阵列技术与增强型小区间干扰协调技术相结合的方案。对该方案进行了建模仿真,结果显示添加了自适应天线阵列的方案在保证了整个小区网络性能的前提下,对Pico扩展区用户的吞吐量有了提升。
[Abstract]:With the rapid development of mobile communication and Internet, users' demand for data services is increasing day by day. Most of these services occur indoors. In order to improve the performance of users, heterogeneous networks are introduced into the LTE-A system, that is, the combination of Acer stations and low power nodes. Although heterogeneous networks can improve the capacity of the whole network, the interference problem between Acer stations and low power nodes greatly affects the performance of users. In order to improve the performance of heterogeneous networks, 3GPP proposes enhanced inter-cell interference coordination techniques, including almost all blank subframes and RE bias technologies. Macro-Pico 's heterogeneous network scenario is the most widely used in the real world, and its interference problem is complex. In this paper, the main interference problems in Macro-Pico are analyzed, and the interference problems in the network are analyzed. Specific research and innovation are as follows. In Macro-Pico heterogeneous networks, the enhanced inter-cell interference coordination technology mainly adopts the time-domain interference coordination technology based on ABS technology and RE bias technology. In this paper, the network modeling of a specific Macro-Pico heterogeneous network is carried out, and the improvement of interference in the network by ABS subframe technology and RE bias technology is analyzed, and the reasonable ABS mode and the range of RE bias values are given. This work has some reference significance for setting RE bias value and ABS ratio of network scene in practice. In the Macro-Pico heterogeneous network with enhanced inter-cell interference coordination technology, the Macro base station strongly interferes with the users in the extension area. In order to solve this problem, a scheme of combining adaptive antenna array technology with enhanced inter-cell interference coordination technique is proposed in this paper. The simulation results show that the scheme with adaptive antenna array can improve the throughput of Pico extension users on the premise of ensuring the performance of the whole cell network.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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