In this article, we justify an online service provisioning (OSP) framework to provision virtualized and micro service (VMS) to users, which can achieve efficient, flexible, and scalable service provisioning. Compared to the onboard service provisioning framework, the system bottleneck shifts from the onboard computation limitation to the network capability and robustness in OSP, which the space-air-ground integrated network (SAGIN) can ably support. First, the motivations of OSP and VMS per the current mobile application industry are identified. Then we investigate the capabilities of the SAGIN to enable the OSP framework, where the evolution of the terrestrial network, on-demand deployment of an aerial network, and global coverage with a satellite network are reviewed. Afterward, we elaborate on three major techniques of VMS provisioning in the OSP framework: application decomposition, control protocol design, and microservice placement/replacement. Finally, we design and implement a case study to demonstrate the efficacy of provisioning VMS in OSP.

中文翻译：

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空空地面集成网络中的虚拟化和微服务供应

在本文中，我们证明了在线服务供应（OSP）框架为用户提供虚拟化和微服务（VMS）的合理性，从而可以实现高效，灵活和可扩展的服务供应。与机载服务供应框架相比，系统瓶颈已从机载计算限制转移到OSP中的网络能力和健壮性，而空空地面集成网络（SAGIN）可以支持该能力。首先，确定当前移动应用行业中OSP和VMS的动机。然后，我们研究了SAGIN启用OSP框架的功能，其中回顾了地面网络的演进，空中网络的按需部署以及卫星网络的全球覆盖范围。之后，我们详细介绍了OSP框架中VMS设置的三种主要技术：应用程序分解，控制协议设计和微服务放置/替换。最后，我们设计并实施了一个案例研究，以演示在OSP中置备VMS的功效。