期刊
IEEE ACCESS
卷 6, 期 -, 页码 26881-26894出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2018.2832630
关键词
Idle cells; ultra-dense small cell networks; SINR mismatch problem; K-S statistics; aggregate interference
资金
- National Research Foundation of Korea through Korean Government (MSIT) [2018R1A2A1A05021029]
- Institute for Information and Communications Technology Promotion Grant through Korean Government (MSIP) [2016-0-00181]
One of the key characteristics in ultra-dense small cell networks (UDNs) is the advent of idle cells which have no associated user equipment (UE). Indeed, idle cells always transmit the cell-specific reference signal (CRS), while they do not transmit data signals. In this paper, we focus on providing a theoretical analysis on the effect of idle cells in terms of the aggregate interference and signal-to-interference ratio (SIR). First, we investigate how idle cells affect the CRS interference (i.e., aggregate interference at the CRS) and data interference (i.e., aggregate interference at the data signals). Specically, we derive the statistical distribution for the ratio of CRS interference to data interference. Second, by using the Kolmogoro-Smirnov statistic, we qualitatively measure the amount of SIR mismatch between CRS SIR and data SIR caused by idle cells in the UDN. In the numerical results, we show that CRS interference becomes larger than data interference with cell densifIcation. We also illustrate that the SIR mismatch between CRS SIR and data SIR becomes severe, as base station (BS)-to-UE density ratio increases (i.e., idle BS ratio increases). Moreover, we can confirm that the SIR mismatch in indoor environment is weaker than outdoor owing to the multiple penetration losses such as outer walls and inner walls.
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