A reliable transmission protocol for zigbee-based wireless patient monitoring

Shyr Kuen Chen, Tsair Kao, Chia Tai Chan, Chih Ning Huang, Chih Yen Chiang, Chin Yu Lai, Tse Hua Tung, Pi Chung Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

93 Scopus citations

Abstract

Patient monitoring systems are gaining their importance as the fast-growing global elderly population increases demands for caretaking. These systems use wireless technologies to transmit vital signs for medical evaluation. In a multihop ZigBee network, the existing systems usually use broadcast or multicast schemes to increase the reliability of signals transmission; however, both the schemes lead to significantly higher network traffic and end-to-end transmission delay. In this paper, we present a reliable transmission protocol based on anycast routing for wireless patientmonitoring. Our scheme automatically selects the closest data receiver in an anycast group as a destination to reduce the transmission latency as well as the control overhead. The new protocol also shortens the latency of path recovery by initiating route recovery from the intermediate routers of the original path. On the basis of a reliable transmission scheme, we implement a ZigBee device for fallmonitoring, which integrates fall detection, indoor positioning, and ECG monitoring. When the triaxial accelerometer of the device detects a fall, the current position of the patient is transmitted to an emergency center through a ZigBee network. In order to clarify the situation of the fallen patient, 4-s ECG signals are also transmitted. Our transmission scheme ensures the successful transmission of these critical messages. The experimental results show that our scheme is fast and reliable.We also demonstrate that our devices can seamlessly integrate with the next generation technology of wireless wide area network, worldwide interoperability for microwave access, to achieve real-time patient monitoring.

Original languageEnglish
Article number06044716
Pages (from-to)6-16
Number of pages11
JournalIeee Transactions On Information Technology In Biomedicine
Volume16
Issue number1
DOIs
StatePublished - Jan 2012

Keywords

  • Anycast
  • Broadcast
  • ECG
  • Multicast
  • Patient monitoring
  • Vital sign sensor
  • Worldwide interoperability for microwave access (WiMAX)
  • ZigBee

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