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arXiv 2011.03734cs.NI
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下一代RAN中的调制压缩:空中接口和前传的权衡

Modulation Compression in Next Generation RAN: Air Interface and Fronthaul trade-offs

Sandra Lagen, Lorenza Giupponi, Andreas Hansson, Xavier Gelabert

摘要:

调制压缩是在最近的Open-RAN(O-RAN)框架中考虑的技术,其继续了3GPP朝着定义新的虚拟化和多供应商RAN架构的努力。基本上,前传压缩是通过降低调制阶数来实现的,因此能够用简单的技术显著降低所需的前传容量。在这项工作中,我们提供了在3GPP和O-RAN中设想的架构,功能划分和前传压缩技术的调查。然后,我们专注于评估的权衡,调制压缩表现出减少前传容量与空中接口性能的影响,通过一个动态的多小区系统级仿真。为此,我们使用符合5G新无线电(NR)规范的基于ns-3的系统级模拟器,并评估不同的流量负载条件和NR参数集。在多小区的情况下,我们的研究结果表明,所需的前传容量的82%的减少,可以实现可忽略不计的空中接口性能下降,通过降低调制阶数到64 QAM,对于不同的参数集和负载条件。在低/中等业务负载中允许更高的调制阶数减少而不降级(达到高达94%的前传容量减少)。

英文摘要:

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).

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