With 5G's rapid global uptake, demand for agile private networks has exploded. A defining beyond-5G capability is network slicing. 3GPP specifies three core slice categories, massive Machine-Type Communications (mMTC), enhanced Mobile Broadband (eMBB), and Ultra-Reliable Low-Latency Communications (URLLC), while ETSI's Zero-Touch Network and Service Management (ZSM) targets human-less operation. Yet existing documents do not spell out end-to-end (E2E) management spanning multiple domains and subnet instances. We introduce the Network Slice-as-a-Service Platform (NASP), designed to work across 3GPP and non-3GPP networks. NASP (i) translates business-level slice requests into concrete physical instances and inter-domain interfaces, (ii) employs a hierarchical orchestrator that aligns distributed management functions, and (iii) exposes clean south-bound APIs toward domain controllers. A prototype was built by unifying guidance from 3GPP, ETSI, and O-RAN, identifying overlaps and gaps among them. We tested NASP with two exemplary deployments, 3GPP and non-3GPP, over four scenarios: mMTC, URLLC, 3GPP-Shared, and non-3GPP. The Communication Service Management Function handled all requests, underlining the platform's versatility. Measurements show that core-network configuration dominates slice-creation time (68 %), and session setup in the URLLC slice is 93 % faster than in the Shared slice. Cost analysis for orchestrating five versus ten concurrent slices reveals a 112 % delta between edge and centralized deployments. These results demonstrate that NASP delivers flexible, standards-aligned E2E slicing while uncovering opportunities to reduce latency and operational cost.

翻译：随着5G在全球范围内的快速普及，对敏捷专用网络的需求急剧增长。网络切片是超越5G的关键能力之一。3GPP定义了三种核心切片类别：大规模机器类通信（mMTC）、增强型移动宽带（eMBB）以及超可靠低延迟通信（URLLC），而ETSI的零接触网络与服务管理（ZSM）则致力于实现无人化运维。然而，现有文档并未阐明跨多个域和子网实例的端到端（E2E）管理方案。我们提出了网络切片即服务平台（NASP），该平台设计用于在3GPP和非3GPP网络中运行。NASP（i）将业务级切片请求转化为具体的物理实例及域间接口，（ii）采用分层编排器来协调分布式管理功能，以及（iii）向域控制器提供清晰的南向API。我们通过统一3GPP、ETSI和O-RAN的指导原则构建了原型系统，并识别了它们之间的重叠与差距。基于两个示例性部署（3GPP与非3GPP），我们在四种场景下测试了NASP：mMTC、URLLC、3GPP共享以及非3GPP。通信服务管理功能处理了所有请求，凸显了该平台的通用性。测量结果表明，核心网络配置占切片创建时间的68%，而URLLC切片中的会话建立速度比共享切片快93%。对编排五个与十个并发切片的成本分析显示，边缘部署与集中部署之间存在112%的差异。这些结果证明，NASP能够提供灵活且符合标准的端到端切片，同时揭示了降低延迟与运营成本的机会。