AI 中文总结
针对5G/6G网络切片跨域管控不协调问题，提出声明式编排器METIS，实现切片全生命周期管理，经测试其性能优异且满足上行管控必要的核心结论。
AI 中文摘要
网络切片是面向应用的5G和6G网络的基石，但跨无线接入网与核心网协调服务质量管控的网络切片实例动态生命周期管理问题仍未解决。现有编排器依赖以网络为中心的数据模型、命令式工作流和静态切片模板，而O-RAN独立处理无线侧切片控制，与3GPP核心侧控制脱节，导致跨域切片级服务质量管控不协调。本文提出METIS，一种声明式切片编排器，通过级联协调循环管理网络切片实例的Day-0/1/2生命周期。METIS定义面向应用的服务配置文件数据模型，支持用户描述其应用的语义和体验质量要求；基于此，METIS遵循5G服务质量模型通过分层聚合导出符合3GPP标准的切片配置文件，摒弃静态模板，联合协调O-RAN与3GPP切片实现切片实例化与管控。核心发现是端到端切片控制存在结构不对称：下行流量可在到达无线接入网前于核心网整形，但上行流量离开用户设备时无管控，因此仅核心网切片无法可靠满足上行服务水平协议，无线侧管控是必要的，而非仅为补充。在校园活动场景的5G云原生测试平台上评估显示，METIS完成切片创建、更新、升级、删除的时间分别为22.4秒、5.1秒、52.2秒、32.1秒；在多切片并发过载下维持100%服务水平协议满意度；扩展至9个区域的63个切片实例时总处理器核心消耗低于0.03；在19秒内从4级注入故障中恢复切片。
英文摘要
Network slicing is the cornerstone of application-aware 5G and 6G networks, yet dynamic lifecycle management of network slice instances with coordinated quality-of-service enforcement across the radio access network and core network remains unresolved. Existing orchestrators rely on network-centric data models, imperative workflows, and static slice templates, while O-RAN addresses radio-side slice control independently of 3GPP core-side control, leaving slice-level quality-of-service enforcement uncoordinated across domains. This paper introduces METIS, a declarative slice orchestrator that manages the Day-0/1/2 lifecycle of network slice instances through cascaded reconciliation loops. METIS defines an application-centric data model for service profiles, enabling customers to describe the semantics and quality-of-experience requirements of their applications. From these, METIS derives 3GPP-aligned slice profiles via hierarchical aggregation following the 5G quality-of-service model, eliminating static templates, and jointly coordinates O-RAN and 3GPP slicing for slice instantiation and enforcement. Our central finding is a structural asymmetry in end-to-end slice control: downlink traffic can be shaped at the core before reaching the radio access network, but uplink leaves the user equipment unregulated, so core-only slicing cannot reliably satisfy uplink service-level agreements - radio-side enforcement is necessary, not merely complementary. Evaluated on a 5G cloud-native testbed in a campus-event scenario, METIS completes slice creation, update, upgrade, and deletion within 22.4, 5.1, 52.2, and 32.1 seconds, respectively; sustains full service-level-agreement satisfaction under concurrent multi-slice overload; scales to 63 slice instances across nine zones consuming under 0.03 processor cores total; and recovers slices from injected failures across four levels in under 19 seconds.
