Design constraints that emerged from the application's requirements have posed new challenges for design of healthcare system using wireless sensor networks. Wireless healthcare monitoring using sensor networks have some different requirements and priorities than those needed for environment, agriculture and industrial monitoring network. This paper discusses healthcare issues and describes a query supported healthcare system using USN platform for health monitoring. This system is capable of obtaining physiological data from sensor attached to patient's body and transfers it wirelessly to a remote base-station in an ad-hoc network, following IEEE802.15.4 standard for wireless communication. Furthermore the system packet loss performance was evaluated for different sampling rates and packet length.
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