Uplink Performance Analysis of Dense Cellular Networks With LoS and NLoS Transmissions
Uplink Performance Analysis of Dense Cellular Networks With LoS and NLoS Transmissions
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DOI：
10.1109/twc.2017.2669023
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发表时间：
2016-09
影响因子：
10.4
通讯作者：
Tian Ding;Ming Ding;Guoqiang Mao;Zihuai Lin;D. López-Pérez;Albert Y. Zomaya
中科院分区：
文献类型：
--
作者：
Tian Ding;Ming Ding;Guoqiang Mao;Zihuai Lin;D. López-Pérez;Albert Y. Zomaya
在本文中，我们分析了密集小蜂窝网络（SCNs）上行链路（UL）的覆盖概率和区域频谱效率（ASE），考虑了包含视距（LoS）和非视距（NLoS）传输的实际路径损耗模型。与已有工作相比，本文采用了以下新方法：1)假设基于最小路径损耗（即最强接收信号强度）的实用用户关联策略（UAS）；2)将基站（BSs）和用户设备（ue）的位置建模为两个独立的齐次泊松点过程；3)考虑了BSs和ue位置的相关性，使我们的分析结果更加准确。与没有区分LoS和NLoS传输的现有工作相比，LoS和NLoS传输对密集SCNs UL的ASE的性能影响在数量和质量上都是显著的。特别是，现有工作预测，在BS密度的实际范围内，即$10^{1}\sim 10^{3}\, $ textrm {BSs/km}^{2}$，较大的UL功率补偿因子总是会导致更好的ASE。然而，我们的研究结果表明，较小的UL功率补偿因子可以大大提高密集SCNs中UL的ASE，即10^{2}\sim 10^{3}\，\textrm {BSs/km}^{2}$，而较大的UL功率补偿因子更适合于稀疏SCNs，即10^{1}\sim 10^{2}\，\textrm {BSs/km}^{2}$。
In this paper, we analyze the coverage probability and the area spectral efficiency (ASE) for the uplink (UL) of dense small cell networks (SCNs) considering a practical path loss model incorporating both line-of-sight (LoS) and non-line-of-sight (NLoS) transmissions. Compared with the existing work, we adopt the following novel approaches in this paper: 1) we assume a practical user association strategy (UAS) based on the smallest path loss, or equivalently the strongest received signal strength; 2) we model the positions of both base stations (BSs) and the user equipments (UEs) as two independent homogeneous Poisson point processes; and 3) the correlation of BSs’ and UEs’ positions is considered, thus making our analytical results more accurate. The performance impact of LoS and NLoS transmissions on the ASE for the UL of dense SCNs is shown to be significant, both quantitatively and qualitatively, compared with existing work that does not differentiate LoS and NLoS transmissions. In particular, existing work predicted that a larger UL power compensation factor would always result in a better ASE in the practical range of BS density, i.e., $10^{1}\sim 10^{3}\,\textrm {BSs/km}^{2}$ . However, our results show that a smaller UL power compensation factor can greatly boost the ASE in the UL of dense SCNs, i.e., $10^{2}\sim 10^{3}\,\textrm {BSs/km}^{2}$ , while a larger UL power compensation factor is more suitable for sparse SCNs, i.e., $10^{1}\sim 10^{2}\,\textrm {BSs/km}^{2}$ .