Coverage Performance Analysis of FeICIC Low-Power Subframes
Coverage Performance Analysis of FeICIC Low-Power Subframes
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DOI：
10.1109/twc.2016.2562619
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发表时间：
2016-08-01
影响因子：
10.4
通讯作者：
Zhang, Jie
中科院分区：
文献类型：
--
作者：
Hu, Haonan;Weng, Jialai;Zhang, Jie
在异构蜂窝网络中提出的几乎空白子帧（ABSF）虽然可以提高小区范围扩展（CRE）用户设备（UE）的性能，但它显著降低了宏小区的总吞吐量。为了解决这个问题，通过进一步增强的小区间干扰协调，鼓励在宏小区中心区域中应用低功率子帧（LPSF）。然而，干扰CRE UE的LPSF的剩余功率以及LPSF的比例一起影响下行链路吞吐量。为了获得更好的速率覆盖概率，需要选择合适的LPSF功率和比例。本文在随机几何框架下推导了总体信干噪比覆盖概率和速率覆盖概率的解析结果。分析了最大化速率覆盖概率的最优区域偏差范围。结果表明，在最佳范围扩展偏差下，ABSF在速率方面仍然优于LPSF，但会导致微微小区回程的负担更重。然而，在静态范围扩展偏置的情况下，LPSF提供比ABSF更好的速率覆盖。此外，在低范围扩展场景中，LPSF的降低的功率对具有最优资源划分的速率覆盖具有可忽略的影响。
Although the almost blank subframes (ABSFs) proposed in heterogeneous cellular networks can enhance the performance of the cell range expansion (CRE) user equipments (UEs), it significantly degrades the macro-cell total throughput. To address this problem, the low power subframes (LPSFs) are encouraged to be applied in the macrocell center region by the further-enhanced inter-cell interference coordination. However, the residual power of the LPSF, which interferes with the CRE UEs, and the proportion of the LPSF affect the downlink throughput together. To achieve a better rate coverage probability, the appropriate LPSF power and the proportion are required. In this paper, the analytical results of the overall signal to interference and noise ratio coverage probability and the rate coverage probability are derived under the stochastic geometric framework. The optimal region bias ranges for maximizing the rate coverage probability are also analyzed. The results show that the ABSF still outperform the LPSF in terms of rate with the optimal range expansion bias, but lead to a heavier burden on the backhaul of the pico-cell. However, with a static range expansion bias, the LPSF provide better rate coverage than the ABSF. In addition, in a low-range expansion scenario, the reduced power of the LPSF has negligible effect on the rate coverage with the optimal resource partitioning.