International Conference on Technology Innovations for Crisis Management [ICTICM]

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Author: search.filters.author.Rallapudi, M.OHas files: Yes

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    ItemOpen Access
    Testing of a resilient community-driven communications network of LoRa devices in Wellington
    (Sri Lanka Institute of Information Technology, 2026-05-21) Perera, W.M.M; Connor-Kebbell, T; Abeydeera, T; Rallapudi, M.O; Vautier, A; Ngan,B; Prasanna, R
    Modern communications infrastructure such as mobile base stations, routing centres and servers are highly vulnerable to grid power loss and catastrophic damage that occur during natural disasters. Such failures render critical communications infrastructure inoperable exactly when they are needed. To address this, CRISiSLab has deployed and evaluated a Meshtastic LoRa mesh network across Wellington’s varied terrain as a low-power, infrastructure independent communications solution. Testing demonstrated that while terrain was the primary limiting factor, effective city-scale communications is achievable with strategic device placement and appropriate preset selection. These findings suggest that Meshtastic is viable as an emergency backup communication network.
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    ItemOpen Access
    Beyond Internet Dependency: LoRa for Post- Earthquake Structural Monitoring
    (Sri Lanka Institute of Information Technology, 2026-05-21) Rallapudi, M.O; Vautier, A; Ngan, B; Perera, P; Prasanna, R
    Acquiring structural response data during and after earthquakes is essential for assessing threats to critical infrastructure; however, conventional transmission systems rely on Internet connectivity that is often disrupted during major seismic events. This study evaluates Long Range (LoRa) radio as a low-power, infrastructure-independent alternative for transmitting building instrumentation data when conventional networks fail. Field experiments were conducted across three New Zealand cities, testing performance under varying radio configurations, elevations, and urban topographies. Results demonstrate reliable urban communication ranges of up to 1.6 km under optimal settings. Elevation was the dominant deployment factor, with packet delivery ratios (PDR) improving from 0–40% at ground level to near-100% at 500 m radial distance when transmitters were positioned on upper floors. Building-to-building links achieved 75–100% PDR with received signal strength values between −55 and −110 dBm, while terrain features such as hills and dense vegetation caused significant attenuation and occasional link failure at shorter distances. These findings confirm the feasibility of LoRa for post-earthquake structural monitoring and provide quantitative guidance for elevation-aware, terrain-conscious deployment in urban environments.