{"ID":2865497,"CreatedAt":"2026-06-01T04:54:23.091178241Z","UpdatedAt":"2026-06-01T04:54:23.091178241Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2509.22568","arxiv_id":"2509.22568","title":"Bridging Technical Capability and User Accessibility: Off-grid Civilian Emergency Communication","abstract":"During large-scale crises disrupting cellular and Internet infrastructure, civilians lack reliable methods for communication, aid coordination, and access to trustworthy information. This paper presents a unified emergency communication system integrating a low-power, long-range network with a crisis-oriented smartphone application, enabling decentralized and off-grid civilian communication. Unlike previous solutions separating physical layer resilience from user layer usability, our design merges these aspects into a cohesive crisis-tailored framework. The system is evaluated in two dimensions: communication performance and application functionality. Field experiments in urban Zürich demonstrate that the 868 MHz band, using the LongFast configuration, achieves a communication range of up to 1.2 km with 92% Packet Delivery Ratio, validating network robustness under real-world infrastructure degraded conditions. In parallel, a purpose-built mobile application featuring peer-to-peer messaging, identity verification, and community moderation was evaluated through a requirements-based analysis.","short_abstract":"During large-scale crises disrupting cellular and Internet infrastructure, civilians lack reliable methods for communication, aid coordination, and access to trustworthy information. This paper presents a unified emergency communication system integrating a low-power, long-range network with a crisis-oriented smartphon...","url_abs":"https://arxiv.org/abs/2509.22568","url_pdf":"https://arxiv.org/pdf/2509.22568v2","authors":"[\"Karim Khamaisi\",\"Oliver Kamer\",\"Bruno Rodrigues\",\"Jan von der Assen\",\"Burkhard Stiller\"]","published":"2025-09-26T16:44:23Z","proceeding":"cs.NI","tasks":"[\"cs.NI\",\"cs.CR\",\"cs.CY\",\"cs.ET\"]","methods":"[]","has_code":false}