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arXiv 1807.04397eess.SP
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毫米波视距阻塞分析

Millimeter Wave Line-of-Sight Blockage Analysis

Ish Kumar Jain

摘要:

毫米波(mmWave)通信系统可以提供高数据速率,但是系统性能可能由于移动阻塞器和用户自身的身体而显著降级。高频率的中断和长时间的阻塞可能会降低体验的质量。例如,超过10毫秒的延迟会导致VR观众恶心。基站(BS)的宏分集已经被认为是一种有前途的解决方案,其中如果当前服务BS被阻塞,则用户设备(UE)可以切换到其他可用BS。然而,在这种情况下,动态阻塞事件的频率和持续时间的分析模型在很大程度上是未知的。在这篇论文中,我们考虑了一个开放的公园般的场景,并获得封闭形式的表达式的阻塞概率,期望频率和阻塞事件的持续时间使用随机几何。我们的研究结果表明,满足AR/VR和其他低延迟应用的服务质量(QoS)要求所需的BS的最小密度在很大程度上是由阻塞事件而不是容量要求驱动的。将BS放置在更高的高度处降低了阻塞的可能性。我们提出了一个封闭形式的表达BS密度高度权衡,可用于网络规划。

英文摘要:

Millimeter wave (mmWave) communication systems can provide high data rates but the system performance may degrade significantly due to mobile blockers and the user's own body. A high frequency of interruptions and long duration of blockage may degrade the quality of experience. For example, delays of more than about 10ms cause nausea to VR viewers. Macro-diversity of base stations (BSs) has been considered a promising solution where the user equipment (UE) can handover to other available BSs, if the current serving BS gets blocked. However, an analytical model for the frequency and duration of dynamic blockage events in this setting is largely unknown. In this thesis, we consider an open park-like scenario and obtain closed-form expressions for the blockage probability, expected frequency and duration of blockage events using stochastic geometry. Our results indicate that the minimum density of BS that is required to satisfy the Quality of Service (QoS) requirements of AR/VR and other low latency applications is largely driven by blockage events rather than capacity requirements. Placing the BS at a greater height reduces the likelihood of blockage. We present a closed-form expression for the BS density-height trade-off that can be used for network planning.

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