计算受限信号在实践中的表现：软件定义O-RAN物理层中的吞吐量异常
Computation-Limited Signals in Practice: A Throughput Anomaly in Software-Defined O-RAN PHY Layers
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中文总结 AI 辅助
本文形式化了软件定义O-RAN物理层中因计算延迟导致的吞吐量异常，提出计算受限机制，并建议在6G链路自适应中考虑PHY处理延迟。
中文摘要 AI 辅助
我们形式化了基于软件的无线物理层（PHY）实现中的一种性能异常，这是开放无线接入网（O-RAN）系统的关键使能技术。对于固定的提供负载，随着标称比特率的增加，传输该负载所需的PHY符号数量会减少，因为每个符号承载更多比特。然而，较短的突发提供了更少的机会来利用流水线化的调制、传输和解调。因此，处理延迟占总交付时间的比例更大，可能导致标称更快的PHY配置提供更低的有效吞吐量。我们将计算延迟主导有效吞吐量的运行条件称为计算受限机制。其最显著的表现发生在提供的负载适合单个符号时：无法利用符号间流水线，调制和解调延迟无法摊销。即使发射机和接收机处理分别满足其实时截止时间，它们的组合延迟也可能超过符号持续时间。由于PHY处理复杂度通常随分配给每个符号的资源超线性增长，因此更高比特率的配置可能比更慢的配置提供更低的吞吐量。我们使用已建立的软件定义PHY实现报告的处理延迟测量来验证这种异常。结果表明，在未来的6G无线网络中，对于极高吞吐量服务，应将PHY处理延迟纳入链路自适应算法中。
英文摘要
We formalize a performance anomaly in software-based wireless physical-layer (PHY) implementations, a key enabling technology for Open Radio Access Network (O-RAN) systems. For a fixed offered load, the number of PHY symbols required to transmit the load decreases as the nominal bit rate increases because each symbol conveys more bits. Shorter bursts, however, provide fewer opportunities to exploit pipelined modulation, transmission, and demodulation. Processing latency therefore represents a larger fraction of the total delivery time and may cause a nominally faster PHY configuration to deliver lower effective throughput. We call the operating condition in which computational latency governs effective throughput the computation-limited regime. Its most pronounced manifestation occurs when the offered load fits in a single symbol: intersymbol pipelining cannot be exploited, and modulation and demodulation latencies cannot be amortized. Their combined latency may exceed the symbol duration even when transmitter and receiver processing independently meet their real-time deadlines. Because PHY processing complexity often scales superlinearly with the resources allocated to each symbol, a higher-rate configuration may consequently deliver lower throughput than a slower one. We validate this anomaly using processing-latency measurements reported for established software-defined PHY implementations. The results show that PHY processing latency should be incorporated into link-adaptation algorithms for very-high-throughput services in future 6G wireless networks.
发表机构
- Federal University of Technology (UTFPR)（联邦技术大学）
- Centre for Informatics and Systems of the University of Coimbra (CISUC)（科英布拉大学信息系统中心）
- CRACS/INESC TEC and Department of Computer Science, Faculty of Sciences, University of Porto（波尔图大学理学院计算机科学系及CRACS/INESC TEC）
- Faculty of Applied Sciences, Macao Polytechnic University（澳门理工学院应用科学学院）
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