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The authors present a 2-tier wireless system for healthcare monitoring of convalescing patients in non-critical condition. A network of sensors adhered to the patient's body used for vital signs collection, and a portable coordinator device forms one tier, whereas a point-to-point link between the coordinator and a fixed access point forms the other tier. They implemented a simple but effective handoff protocol to support uninterrupted monitoring of mobile patients by employing sensor devices featuring limited radio range and low power usage that are amenable for home use.
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