论文标题
下一代的调制压缩：空气界面和领先权衡取舍
Modulation Compression in Next Generation RAN: Air Interface and Fronthaul trade-offs
论文作者
论文摘要
调制压缩是最近的Open-RAN（O-RAN）框架中考虑的一种技术，该框架一直努力定义新的虚拟化和多供应商的架构。基本上，通过降低调制顺序来实现领前压缩，从而可以使用简单的技术急剧减少所需的fronthaul容量。在这项工作中，我们对3GPP和O-RAN设想的体系结构，功能拆分和领先压缩技术进行了调查。然后，我们专注于通过动态多电池系统级别的模拟来评估调制压缩以降低的领前容量与对空气界面性能的影响方面表现出的权衡。为此，我们使用符合5G新无线电（NR）规格的基于NS-3的系统级模拟器，并评估不同的交通负荷条件和NR数字。在多细胞的情况下，我们的结果表明，对于不同的数字和负载条件，通过将调制顺序降低到64QAM，可以通过将调制顺序降低到64QAM来实现82％的降低，可忽略不计的空气界面性能降解。在低/中等的交通负荷中，允许较高的调制订单减少而不会降解（最高可降低94％的前船长容量）。
Modulation compression is a technique considered in the recent Open-RAN (O-RAN) framework, which has continued the 3GPP effort towards the definition of new virtualized and multi-vendor RAN architectures. Basically, fronthaul compression is achieved by means of reducing the modulation order, thus enabling a dramatic reduction of the required fronthaul capacity with a simple technique. In this work, we provide a survey of the architectures, functional splits, and fronthaul compression techniques envisioned in 3GPP and O-RAN. Then, we focus on assessing the trade-offs that modulation compression exhibits in terms of reduced fronthaul capacity versus the impact on the air interface performance, through a dynamic multi-cell system-level simulation. For that, we use an ns-3 based system-level simulator compliant with 5G New Radio (NR) specifications and evaluate different traffic load conditions and NR numerologies. In a multi-cell scenario, our results show that an 82% reduction of the required fronthaul capacity can be achieved with negligible air interface performance degradation by reducing the modulation order down to 64QAM, for different numerologies and load conditions. A higher modulation order reduction without degradation is permitted in low/medium traffic loads (reaching up to 94% fronthaul capacity reduction).
