5G comes with the promise of sub-millisecond latency, which is critical for realizing an array of emerging URLLC services, including industrial, entertainment, telemedicine, automotive, and tactile Internet applications. At the same time, slicing-ready 5G networks face the challenge of accommodating other heterogeneous coexisting services with different and potentially conflicting requirements. Providing latency and reliability guarantees to URLLC service slices is thus not trivial. We identify transmission scheduling at the RAN level as a significant contributor to end-toend latency when considering network slicing. In this direction, we propose a two-level MAC scheduling framework that can effectively handle uplink and downlink transmissions of network slices of different characteristics over a shared RAN, applying different per-slice scheduling policies, and focusing on reducing latency for URLLC services. Our scheme offers the necessary flexibility to dynamically manage radio resources to meet the stringent latency and reliability requirements of URLLC, as demonstrated by our simulation results.

中文翻译：

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通过两级 MAC 调度为切片就绪 5G 系统提供低延迟保证


5G 有望实现亚毫秒级延迟，这对于实现一系列新兴 URLLC 服务至关重要，包括工业、娱乐、远程医疗、汽车和触觉互联网应用。与此同时，切片就绪的 5G 网络面临着适应其他异构共存服务的挑战，这些服务具有不同且可能相互冲突的要求。因此，为 URLLC 服务切片提供延迟和可靠性保证并非易事。在考虑网络切片时，我们认为 RAN 级别的传输调度是造成端到端延迟的重要因素。在这个方向上，我们提出了一种两级MAC调度框架，可以有效地处理共享RAN上不同特征的网络切片的上下行传输，应用不同的每切片调度策略，并专注于减少URLLC服务的延迟。正如我们的模拟结果所证明的那样，我们的方案提供了动态管理无线电资源所需的灵活性，以满足 URLLC 严格的延迟和可靠性要求。