The space-air-ground-sea integrated network (SAGSIN) has emerged as a consensus from both industry and academia to provide seamless coverage and ubiquitous connectivity in the upcoming sixth generation networks, which can facilitate various remote mission-critical applications. However, the quality of service (QoS) satisfaction of mission-critical applications is significantly undermined by the adverse impacts resulting from the inherent characteristics of SAGSIN, including large scale, high dynamics, low computing and caching capability, and limited perception and communication. These characteristics severely deteriorate the timeliness and ultimate effectiveness performances of mission-critical applications in SAGSIN. In this article, we present an effectiveness-oriented SAGSIN which lays particular emphasis on the timeliness/effectiveness performance in order to ensure QoS demands of mission-critical applications. We review classic performance metrics, and then propose a new metric, named synchronization cost of information (SCoI) that directly describes the effectiveness of mission-critical applications. To effectively support mission-critical applications, we propose a joint perception-communication-computing-actuation (JPCCA) framework that adapts to the time-varying network environment. A case study on object detection and tracking in SAGSIN demonstrates the superiority of the proposed metric and framework as compared to baseline schemes. Finally, we point out the open issues on effectiveness-oriented SAGSIN implementation.

中文翻译：

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以效率为导向的 SAGSIN：推出统一指标和综合框架


天地海一体化网络（SAGSIN）已成为业界和学术界的共识，旨在为即将到来的第六代网络提供无缝覆盖和无处不在的连接，从而促进各种远程关键任务应用。然而，SAGSIN 的固有特征（包括大规模、高动态性、低计算和缓存能力以及有限的感知和通信）所产生的不利影响严重削弱了关键任务应用的服务质量（QoS）满意度。这些特征严重恶化了 SAGSIN 中关键任务应用程序的及时性和最终有效性。在本文中，我们提出了一种以有效性为导向的SAGSIN，它特别强调及时性/有效性性能，以确保关键任务应用程序的QoS需求。我们回顾了经典的性能指标，然后提出了一个新的指标，称为信息同步成本（SCoI），它直接描述任务关键型应用程序的有效性。为了有效支持关键任务应用，我们提出了一种适应时变网络环境的联合感知-通信-计算-驱动（JPCCA）框架。 SAGSIN 中对象检测和跟踪的案例研究证明了所提出的指标和框架与基线方案相比的优越性。最后，我们指出了以有效性为导向的 SAGSIN 实施中尚未解决的问题。