The Study of Body Access Network

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The Study of Body Access Network??????????????
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Background

• User-center mobile world
• Personal area domain
• BAN
• Immediate area domain
• PAN, WLAN
• Up to several tens of meters
• Wide area domain
• Cellular and satellite networks
• Global coverage

BAN Body Area Network PAN Personal Area Network
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Introduction to Intra-body Communications

• What is intra-body communication (IBC)?
• Short-range communication between devices in
  which the human body is used as the signal
  transmission medium
• Near-field communication solution for BANs
• Methods for intra-body transmissions
• Electric field type
• Electromagnetic type
• IBC classification
• Body-environment communication
• Body-body communication
• Intra-body
• Inter-body

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Potential IBC Applications

• New e-wallet system
• Transfer of information between all type of
  devices
• Patient medical record access in medical
  emergencies
• Applications for blind people
• Orientation (walking in streets, train terminals)
• Location-based information
• E-payment (buying products, access station ticket
  gate)
• Personal identification (open doors)

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Elements and Features IBC System Model (1)

• Central unit or master device (CU)
• Intelligent hub for users BAN
• Manage and control all the active IBC enabled
  devices
• Store information about
• users personal data
• properties of active BAN devices
• Detection of potential establishment of IBC
  between BAN devices
• Transfer the data to the most suitable terminal

CU
Intra-body communications (IBC)
Out-body communications
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New Dynamic Personalized Advertising System by
Using IBC in Trains

• Advertising device above handle with a small
  system-on-a-chip integrated
• Store several types of data with commercials
  addressed to different social groups
• When passenger touches the handle, personalized
  information could be sent
• Wristwatch
• Central unit
• Store information about users interests and
  preferences
• Decide whether user wants to receive information
  from the handle
• Depending on the type of BAN devices available,
  resend the most suitable type of data to the
  most suitable device
• Data identification code of selected BAN device
  transmitted so that only the selected device
  could receive the information correctly

Advertising device
Handle
IBC enabled wristwatch



IBC enabled mobile phone
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Experiment Setup (2)
TX and RX design model Signal electrode round
copper plate Ground (GND) Circuit board as the
GND plate Round copper electrode touching the
body (some configurations) Height between signal
electrode and GND plate 1.2cm Several
combinations of TX and RX in order to decide the
optimal configuration GND circuit board plate
size Signal electrode size With or without GND
electrode touching the arm Height between signal
electrode and GND plate
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Frequency Domain Response
Configuration 7

• Long distance causes more path loss, especially
  in high frequency band
• Suitable frequency band between 200MHz500MHz

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Time Domain Response
Air Propagation
Intra-body Propagation
Distance 20cm
Distance 55cm
The power of strongest echo of body channel is
nearly 22-25dB higher than air channel ?
confirmation of intra-body communication when
TXRX touching skin In intra-body propagation,
there is some periodicity between the first three
echoes with a time difference of approximately
5ns between echoes