A Reliable Transmission
Protocol for ZigBee-Based
Wireless Patient
Monitoring
IEEE JOURNALS
Volume: 16 , Issue:1
Shyr-Kuen Chen, Tsair Kao, Chia-Tai Chan,
Chih-Ning Huang, Chih-Yen Chiang, Chin-Yu Lai,
Tse-Hua Tung, and Pi-Chung Wang
Presenter: Yu-Ming Chen
Adviser: Hung-Chi Yang
Outline
 Introduction
 Related
Work
 Reliable Transmission Protocol
 Fall Monitoring system
 Simulation and implementation Results
 Conclusion
INTRODUCTION

The global elderly population is fast
growing and will outnumber the population
of children in near future.

The changes brought about by the aging
society include an increasing demand for
caretaking; thus, patient monitoring
systems are gaining their importance in
reducing the need for human resources.
INTRODUCTION

In this paper, we present a reliable
transmission protocol based on anycast
routing for wireless patient monitoring.
INTRODUCTION

In this paper, we present a reliable
protocol of packet forwarding that
transmits emergency messages with vital
signs on a multihop ZigBee network.
INTRODUCTION

We deploy multiple data sinks in a ZigBee
network.

Our protocol uses anycast to find the
nearest available data sink.

When the path to the original data sink
fails, our protocol automatically selects
another data sink as destination.
INTRODUCTION

As compared with multicast/broadcast
approaches, our protocol significantly
reduces the traffic overhead while
maintaining the reliability at the same
level.
INTRODUCTION

We implement a ZigBee device for fall
monitoring, which integrates fall detection
indoor positioning, and ECG monitoring.

When the triaxial accelerometer of our
device detects a fall, the current position of
the patient is generated and transmitted to
a data sink through a ZigBee network.
INTRODUCTION

In order to clarify the situation of the fallen
patient, 4-s ECG signals are transmitted
along with the emergency message.
RELATED WORK

A Communication Modes
Data transmission can be categorized into
four modes, namely unicast, multicast,
broadcast, and anycast.
RELATED WORK
B. Wireless Patient Monitoring System
This framework uses four routing
schemes(multicast, reliable multicast,
broadcast, and reliable broadcast)
RELATED WORK
B. Wireless Patient Monitoring System
Using IEEE 802.15.4 standard for ECG,
the maximum payload size only allow up
to 118 samples per frame bringing the
accumulation delay to 236ms.
802.15.4
RELATED WORK
B. Wireless Patient Monitoring System
The minimum data sampling rate of 1
sample per frame result in an accumulated
delay of 2 ms.
RELATED WORK

B. Wireless Patient Monitoring System
Previous schemes tend to use broadcast
or multicast schemes to achieve message
delivery in a multihop wireless network.
RELATED WORK

B. Wireless Patient Monitoring System
Although the number of transmission hops and
traffic overhead can be reduced by using excess
transmission power, the collision domain is also
enlarged to severely degrade the transmission
efficiency of MAC layer.
RELATED WORK

B. Wireless Patient Monitoring System
We combine anycast with a reliable transmission
mechanism to improve the efficiency of message
transmission in this paper.
Since our scheme does not rely on in creasing
transmission power, the power efficiency of our
scheme can be improved as well.
RELIABLE TRANSMISSION
PROTOCOL

Sensor Node

Router Node

Data
receiver
RELIABLE TRANSMISSION
PROTOCOL

A. Sensor Node
RELIABLE TRANSMISSION
PROTOCOL

B. Router Node
RELIABLE TRANSMISSION
PROTOCOL

C. Data Receiver
FALL MONITORING SYSTEM

SVM: Sum Vector Magnitude of acceleration
SIMULATION AND
IMPLEMENTATION RESULTS

A. Simulation Results
SIMULATION AND
IMPLEMENTATION RESULTS

B. Implementation Results
CONCLUSION

This paper presents a reliable anycast routing
protocol for ZigBee-based wireless patient
monitoring.

A broken path can be recovered in a short
latency.

We demonstrate that our scheme can improve
the feasibility of wireless patient monitoring
systems.