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Real-time patient monitoring is critical to early detection of clinical patient deterioration in general hospital wards. A key challenge in such applications is to reliably deliver sensor data from mobile patients. The authors present an empirical analysis on the reliability of data collection from wireless pulse oximeters attached to users. They observe that most packet loss occur from mobile users to their first-hop relays. Based on this insight they developed the Dynamic Relay Association Protocol (DRAP), a simple and effective mechanism for dynamically discovering the right relays for wireless sensors attached to mobile users.
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