LTE-A异构网eICIC技术研究

发布时间：2018-09-14 18:09

【摘要】：随着移动互联网的迅速发展以及城市人口的快速增长,在地域上会形成越来越多的通信热区以及通信盲区。利用传统宏基站进行“补盲”以及“补热”不仅费用昂贵,而且与现有基站形成强烈的相互干扰。在LTE-A中引入Pico的目的就是为了“补盲”和“补热”,其中“补热”的Pico由于受到宏基站的强干扰而造成接入用户很少,达不到“补热”的目的。小区区域扩展技术可以使得更多的用户接入到Pico,但是位于Pico扩展区域内的用户信道质量很差,吞吐量较低。基于此,本文研究了时域eICIC技术和功率控制技术。本文首先介绍了LTE-A异构网中的关键技术,并分析了LTE-A异构网的干扰场景和eICIC技术。然后,介绍了时域eICIC中的LP-ABS(低功率子帧)技术,并针对不同参数对其性能的影响作出仿真分析。在此基础上,研究了基于LP-ABS子帧配置比例以及配置功率自适应的LP-ABS算法(简称自适应LP-ABS算法),在每个仿真时刻各个扇区根据本扇区内接入Pico的用户比例以及干扰情形动态地对LP-ABS子帧的配置比例和配置功率作出调整,仿真结果表明自适应LP-ABS算法不仅很好的缓解了本扇区宏基站对Pico的强干扰,而且有效地提高了扇区内的用户公平性以及通信稳定性。最后在分析自适应LP-ABS算法优缺点的基础上,研究了基于LP-ABS及功率控制的eICIC算法,包括同扇区内Pico联合功率控制算法和基于临扇区宏基站对Pico用户保护的修正自适应LP-ABS算法。仿真结果表明虽然本算法在一定程度上降低了宏基站用户的吞吐量和Pico信道质量较好的用户的吞吐量,但是改善了Pico信道质量较差的用户的吞吐量并且提高了扇区内的用户公平性和通信稳定性。
[Abstract]:With the rapid development of mobile Internet and the rapid growth of urban population, more and more communication hot areas and communication blind areas will be formed in the region. Using traditional Acer stations to "blind" and "heat compensation" is not only expensive, but also has strong interference with existing base stations. The purpose of introducing Pico into LTE-A is to "supplement blindness" and "heat supply", in which the "heating up" Pico is not able to achieve the purpose of "heating up" because of the strong interference of Acer station resulting in very few access users. Cell area expansion technology enables more users to access Pico, but the channel quality is poor and throughput is low in the Pico extension area. Based on this, time domain eICIC technology and power control technology are studied in this paper. In this paper, the key technologies of LTE-A heterogeneous network are introduced, and the interference scene and eICIC technology of LTE-A heterogeneous network are analyzed. Then, the LP-ABS (low power subframe) technique in time domain eICIC is introduced, and simulation analysis is made for the influence of different parameters on its performance. On this basis, In this paper, the adaptive LP-ABS algorithm based on LP-ABS sub-frame configuration ratio and configuration power adaptive (LP-ABS) algorithm is studied. At each simulation time, each sector is dynamically aligned according to the proportion of users accessing the Pico within the sector and the interference situation. The configuration ratio and configuration power of LP-ABS subframes are adjusted, The simulation results show that the adaptive LP-ABS algorithm not only alleviates the strong interference of the macro base station to Pico, but also effectively improves the user fairness and communication stability in the sector. Finally, based on the analysis of the advantages and disadvantages of the adaptive LP-ABS algorithm, the eICIC algorithm based on LP-ABS and power control is studied, including the Pico joint power control algorithm in the same sector and the modified adaptive LP-ABS algorithm based on the Pico user protection in the near sector macro base station. The simulation results show that although the proposed algorithm can reduce the throughput of users in Acer stations and the throughput of users with good Pico channel quality to some extent, However, the throughput of users with poor Pico channel quality is improved, and the user fairness and communication stability in the sector are improved.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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