WBAN Wireless Body Area Network for Health Monitoring by linzhengnd

VIEWS: 64 PAGES: 9

									  Wireless Body Area Network
  for Health Monitoring


Emil Jovanov, Chris Ott, Aleksandar Milenkovic
     Electrical and Computer Engineering
   The University of Alabama in Huntsville
         email: jovanov@ece.uah.edu
   Web: http://www.ece.uah.edu/~jovanov
WBAN: Motivation
   Goal: ubiquitous and affordable healthcare
   Conditions: demographic and technology trends
   Solution: 3-tier ubiquitous monitoring system
    – Tier 1: Wireless Body Area Network (WBAN)
    – Tier 2: Personal Server
    – Tier 3: Healthcare Provider Servers
   Opportunities:
    – Ambulatory health monitoring
    – Computer-assisted rehabilitation
    – Augmented reality systems
   Long-term benefits:
    – Promote healthy lifestyle
    – Seamless integration of data into personal medical
      records and research databases
    – Knowledge discovery through data mining
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Ubiquitous Health Monitoring




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3-tier Hierarchical Organization




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  ActiS: Activity Sensor
            ISPM                                Telos

  ADXL202                                                 CC2420
Accelerometer                                             (ZigBee)
                       TI
  ADXL202          MSP430F1232         TI                  Flash
Accelerometer                      MSP430F149
 ECG Signal
                                                        USB Interface
 Conditioning



ECG electrodes




                     ActiS as
                   Motion Sensor
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       ActiS: Signal Processing
                             Accelerometer based step recognition
                                                                                       Vy[m/s]
1.6                                                                                    Alpha[rad]
                                                                                       accY[g]
                                                                                       Step
                                                                                       Foot switch
1.4

                                                          Step detected

1.2



  1



0.8



0.6



0.4



0.2



  0



-0.2



-0.4




   46     46.5   47   47.5         48         48.5       49         49.5   50   50.5                 51
                                            Time[s]
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       ActiS: Communication Timing
            ...   Cycle #9      Cycle #10       Cycle #1   Cycle #2    Cycle #3
   Telos
   ISPM
CC2420 Rx
CC2420 Tx




                             Start Radio         Transmit Stop Radio

                                        6 ms              3.5-8 ms   400 us


                                                   Start        Transmit Stop
                                                   Done         Done     Done


                                                Problem: USART sharing!
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Issues in WBAN
   Affordable and ubiquitous monitoring
    – Utilize common off-the-shelf components,
      capable of seamless integration into a WBAN
   Open issues
    – Standardization of sensors
      (specificity, range, precision, type)
    – Rules of engagement and sensor placement
    – Sensor calibration & customization
    – Integration of data into medical databases
    – Privacy and security
   Social impact and business opportunities
Working group for Health-Monitoring Applications (Tiny-HMS)
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Historical Overview
 Basic WISE (Y00)             Reconfigurable SpO2 Sensor (Y04)
                                    Signal Conditioning                              RS232 Interface




                                       Finger Probe        Programmable Logic   Microcontroller




WHRM



                          MOGUL                           Distributed Stress
                                                          Monitoring (Y03)
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