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논문 기본 정보

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(University of Ulsan) (University of Ulsan) (University of Ulsan) (University of Ulsan) (University of Ulsan) (University of Ulsan) (University of Ulsan)
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한국정보통신학회 INTERNATIONAL CONFERENCE ON FUTURE INFORMATION & COMMUNICATION ENGINEERING 2026 INTERNATIONAL CONFERENCE ON FUTURE INFORMATION & COMMUNICATION ENGINEERING Vo.17 No.1
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    초록·키워드

    This paper presents a real-time campus shuttle tracking system that avoids a per-vehicle cellular modem: a Raspberry Pi in the bus acts as a Bluetooth Low Energy (BLE) peripheral, and the driver smartphone relays telemetry to a Spring Boot backend over WebSocket. The prototype transports GPS and speed via BLE GATT notifications, with a 16-byte BLE advertising record as the deployment-oriented design target. The backend caches the latest vehicle state in Redis with a 5-min TTL and broadcasts updates to student clients; the broader University of Ulsan service covers seven routes, 44 stops, and 66 backend APIs. We analyze the latency budget, report a 50-trial driving-environment test (BLE reconnection 6.394 s mean with 100% recovery; end-to-end 6.601 s mean), and evaluate broadcast fan-out (single-client 45.7 ms; 100-subscriber fan-out 71.0 ms). Under steady- state operation the model predicts sub-second end-to-end delay; during transient BLE reconnection, the reconnect time (~6.6 s) — not the backend — dominates.

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