Distributed spectral efficiency optimization at hotspots through self organisation of BS tilts
Distributed spectral efficiency optimization at hotspots through self organisation of BS tilts
复制标题
通过BS倾斜自组织在热点处进行分布式频谱效率优化
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
R. Tafazolli
中科院分区：
文献类型：
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作者：
A. Imran;M. Imran;A. Quddus;R. Tafazolli
弹出的业务热点，即地理上集中的用户口袋是无线蜂窝系统中差的用户体验背后的持续时间原因。这种突发热点的时空不可预测性使得它们难以在蜂窝系统的规划阶段被设计出来，因此需要动态和自适应的解决方案来以即兴的方式科普它们。在本文中，我们提出了一种新的解决方案，解决了这个问题，通过动态提高频谱效率，在热点地区，通过优化系统范围内的BS天线倾斜分布的方式。与大多数提供热点缓解解决方案的现有工作不同，我们的解决方案不依赖于向相邻小区的负载转移;相反，它通过联合优化多个相邻小区相对于这些小区中的热点位置的天线倾斜来动态地增强整体频谱效率，从而提高系统的容量。此外，根据生物系统中的自组织原理设计，我们的解决方案是自组织的，并且可以在热点存在的情况下将系统中的用户频谱效率提高高达1b/s/Hz，而没有显著的开销。
Pop up traffic hotspots i.e. geographically concentrated user pockets are a time persistent reason behind poor user experience in wireless cellular system. Spatio temporal unpredictability of such pop up hotspots renders them difficult to be designed out in the planning phase of the cellular system hence dynamic and adaptive solutions are required to cope with them in an impromptu manner. In this paper we present a novel solution that addresses this problem by dynamically enhancing spectral efficiency in hotspot regions through optimisation of system wide BS antenna tilts in distributed fashion. Unlike most of the existing works that provide solutions for hotspot relief, our solution does not rely on load transferring to neighbour cells; rather it dynamically enhances the overall spectral efficiency and thus capacity of the system by jointly optimising antenna tilts of multiple adjacent cells with respect to hotspot locations in those cells. Furthermore, being designed on the principles of self organization in biological system, our solution is self organising and can improve the user spectral efficiency in a system by upto 1b/s/Hz in presence of hotspots with no significant overheads.