As the next-generation Internet paradigm, Web 3.0 encapsulates the expectations of user-centric immersion and interaction experiences in a decentralized manner. Metaverse, a virtual world interacting with the physical world, is becoming one of the most potential technology to push forward with Web 3.0. In the Metaverse, users expect to tailor immersive and interactive experiences by customizing real-time Metaverse services (e.g., augmented/virtual reality and digital twin) in the three-dimensional virtual world. Nevertheless, there are still no unified solutions for the Metaverse services in terms of management and orchestration. It is calling for a continuous evolution of scalable solutions and mobile systems to support Metaverse services, and thus bring Metaverse into reality. In this paper, to provide scalable subscription solutions for Metaverse services, we propose a new concept, named Metaverse-as-a-Service (MaaS), in which various physical-virtual components and technologies in the Metaverse can be delivered as services. Furthermore, to unify the management and orchestration of MaaS, we propose a novel framework, called Slicing4Meta, to customize Metaverse services by intelligently integrating MaaS models and the associated multi-dimensional resources on the components and technologies. Additionally, we propose the classification for typical Metaverse services based on the quality of experience (QoE) requirements and illustrate how to fulfill the QoE requirements under the Slicing4Meta framework. We then illustrate a virtual traveling study case, in which we examine the relationship between the QoE and the multi-dimensional resources by quantitatively modeling the QoE of Metaverse users. Finally, we discuss some open challenges of Slicing4Meta and propose potential solutions to address the challenges.

翻译：作为下一代互联网范式，Web 3.0以去中心化方式承载了以用户为中心的沉浸式交互体验期望。元宇宙作为与物理世界交互的虚拟世界，正成为推动Web 3.0发展的最具潜力技术之一。在元宇宙中，用户期望通过定制三维虚拟世界中的实时元宇宙服务（如增强/虚拟现实与数字孪生）来获得沉浸式交互体验。然而，当前针对元宇宙服务的管理与编排仍缺乏统一解决方案，亟需持续演进的可扩展解决方案与移动系统来支撑元宇宙服务，进而推动元宇宙走向现实。本文为提供元宇宙服务的可扩展订阅方案，提出"元宇宙即服务"（MaaS）新概念，将元宇宙中各类虚实融合组件与技术以服务形式交付。进而为统一MaaS的管理与编排，提出新型框架Slicing4Meta，通过智能集成MaaS模型及其关联的组件技术多维资源，实现元宇宙服务的定制化。此外，本文基于体验质量（QoE）需求对典型元宇宙服务进行分类，并阐述如何在Slicing4Meta框架下满足QoE需求。通过虚拟旅行研究案例，定量建模元宇宙用户QoE与多维资源的关系。最后，讨论Slicing4Meta面临的开放挑战并提出潜在解决方案。