Emerging Protocol and Architecture Requirements for 6G-Enabled Wireless Sensor Technologies in Space- Air-Ground Integrated Networks (SAGIN)

The convergence of space, air, and ground networks into a unified Space-Air- Ground Integrated Network (SAGIN) is a promising paradigm for enabling ubiquitous, lowlatency, and reliable connectivity in the era of 6G. Wireless Sensor Networks (WSNs), empowered by 6G technologies, play a vital role in mission-critical applications such as disaster management, intelligent transportation, and global IoT services. This paper discusses emerging requirements in protocol design and network architecture for 6G-enabled WSNs within SAGIN. Specifically, we focus on (i) edge-enabled data aggregation and redundancy elimination, (ii) machine learning (ML)-driven security and intrusion detection, (iii) multi-modal communication integrating RF, VLC, and satellite links, (iv) support for Quality of Service (QoS) and Quality of Experience (QoE), (v) deployment cost and scalability of VLC and satellite infrastructures, and (vi) the need for global standards to harmonize SAGIN protocols. Insights from recent research are integrated to highlight challenges and opportunities toward achieving intelligent, cost-effective, and secure SAGIN ecosystems.