A space and terrestrial integrated network (STIN) converges satellite communication networks, mobile wireless networking, and the Internet, has greatly extended the scope of cyberspace. The STIN is composed of diverse network elements and supports various access technologies, and the coordinations in the hybrid networks can better support complex and changeable communication tasks. Furthermore, the STIN takes advantage of the merits of low delay and large bandwidth in terrestrial networks, and achieves global coverage without the limitation of geographic conditions, which can support positioning and navigation, emergency relief, space exploration, and so on. However, the research on STIN is still confronted with some fundamental challenges including time-varying network topology, high satellite mobility, large end-to-end delay, scalability, and so on. In this article, we present a composite architecture that integrates space and terrestrial network components for providing anytime anywhere communications by utilizing the software defined networking and mobile edge computing paradigms, which not only facilitates the network management and increases network flexibility, but also provides improved quality of service for global multimedia services. Additionally, we identify a number of challenging issues associated with the proposed STIN architecture, including mobility management, resource management, routing, traffic steering, security, and so on, a

中文翻译：

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软件定义的空地集成网络：体系结构，挑战和解决方案

空间和地面综合网络（STIN）融合了卫星通信网络，移动无线网络和Internet，大大扩展了网络空间的范围。STIN由各种网络元素组成，并支持各种访问技术，并且混合网络中的协调可以更好地支持复杂且可变的通信任务。此外，STIN充分利用了地面网络中低延迟和高带宽的优点，并在不受地理条件限制的情况下实现了全球覆盖，从而可以支持定位和导航，紧急救援，太空探索等。但是，有关STIN的研究仍面临一些基本挑战，包括时变网络拓扑，高卫星移动性，较大的端到端延迟，可扩展性，等等。在本文中，我们提出了一种综合体系结构，该体系结构集成了空间和地面网络组件，以利用软件定义的网络和移动边缘计算范例来提供随时随地的通信，这不仅促进了网络管理并提高了网络灵活性，而且还提高了质量全球多媒体服务的服务。此外，我们确定了与拟议的STIN架构相关的许多具有挑战性的问题，包括移动性管理，资源管理，路由，流量控制，安全性等。这不仅促进了网络管理并增加了网络灵活性，而且还为全球多媒体服务提供了更高的服务质量。此外，我们确定了与拟议的STIN架构相关的许多具有挑战性的问题，包括移动性管理，资源管理，路由，流量控制，安全性等。这不仅促进了网络管理并增加了网络灵活性，而且还为全球多媒体服务提供了更高的服务质量。此外，我们确定了与拟议的STIN架构相关的许多具有挑战性的问题，包括移动性管理，资源管理，路由，流量控制，安全性等。