Metaverse aims to construct a large, unified, immersive, and shared digital realm by combining various technologies, namely XR (extended reality), blockchain, and digital twin, among others. This article explores the Metaverse from the perspective of multimedia communication by conducting and analyzing real-world experiments on four different Metaverse platforms: VR (virtual reality) Vircadia, VR Mozilla Hubs, VRChat, and MR (mixed reality) Virtual City. We first investigate the traffic patterns and network performance in the three VR platforms. After raising the challenges of the Metaverse streaming and investigating the potential methods to enhance Metaverse performance, we propose a remote rendering architecture and verify its advantages through a prototype involving the campus network and MR multimodal interaction by comparison with local rendering.

翻译：元宇宙旨在通过结合扩展现实（XR）、区块链、数字孪生等多种技术，构建一个大规模、统一、沉浸式且共享的数字领域。本文从多媒体通信角度出发，通过四种不同元宇宙平台（VR Vircadia、VR Mozilla Hubs、VRChat及MR Virtual City）的真实世界实验进行探索。我们首先研究了三个VR平台的流量模式与网络性能。在提出元宇宙流媒体面临的挑战并探究潜在性能优化方法后，提出一种远程渲染架构，并通过校园网络与MR多模态交互原型与本地渲染的对比验证其优势。