论文标题
使用OpenAirInterface在频域中的下行链路Fronthaul压缩
Downlink Fronthaul Compression in Frequency Domain using OpenAirInterface
论文作者
论文摘要
本文提出了一种用于在集中式Radio访问网络（C-RAN）的Packet Fronthaul中传输下行链路无线电信号开发的压缩方案。该技术是针对频域功能拆分量身定制的，其中不活动的LTE（或5G NR）资源元素可能不会在数据包中传输。这允许降低链接数据速率，尤其是当电池负载较低时。压缩方案基于两个部分：侧面信息的传输以指示LTE的活动和不活跃的资源元素，以及不均匀的标量量化，以压缩活性资源元素的QAM符号。该方法是在OpenAirInterface（OAI）软件中实现的，以进行实时评估。测试床的结果显示，链接使用情况的大幅度降低，计算成本较低。
This paper presents a compression scheme developed for the transport of downlink radio signals in packet fronthaul of centralized-radio access networks (C-RAN). The technique is tailored to frequency-domain functional splits, in which inactive LTE (or 5G NR) resource elements may not be transmitted in the packets. This allows decreasing the link data rate, especially when the cell load is low. The compression scheme is based on two parts: transmission of side information to indicate active and inactive resource elements of the LTE, and nonuniform scalar quantization to compress the QAM symbols of the active resource elements. The method was implemented in the OpenAirInterface (OAI) software for real-time evaluation. The testbed results show a significant reduction in link usage with a low computational cost.
