Project: IEEE P802.15 Working Group for Wireless Personal Area Networks   (WPANs)
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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Consideration of implantable biomedical systems] Date Submitted: [January, 2007] Source: [Bin Zhen, Huan-Bang Li and Ryuji Kohno]

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Submission Title: [Consideration of implantable biomedical systems]

Date Submitted: [January, 2007]

Source: [Bin Zhen, Huan-Bang Li and Ryuji Kohno]

Company [National Institute of Information and Communications Technology (NICT)]

Contact: Bin Zhen

Voice:[+81 46 847 5445, E-Mail: [email protected]]

Abstract: [This document analyze the performance of IEEE 802.15.4b for implantable systems.]

Purpose: [potential technologies for BAN healthcare application.]

Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.

Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.


Consideration of implantable biomedical systems

Consideration of implantable biomedical systems Area Networks (WPANs)

B. Zhen, H.-B Li and R. Kohno

National Institute of Information and Communications Technology (NICT)


Motivations
Motivations Area Networks (WPANs)

  • Where to start BAN standardization?

    • from implantable application point of view

  • Review of implanted device research

  • Performance analysis of IEEE 802.15.4b for implantable communication


High rate implantable applications
High rate implantable applications Area Networks (WPANs)


Low rate implantable applications
Low rate implantable applications Area Networks (WPANs)


Implantable device

Energy scavenging Area Networks (WPANs)

Battery

External coupling

Actuators

(stimulator, drug pump…)

Inductive link

Sensors

(image, pressure, glucose, …)

Peripherals

(EEG, EMG…)

ISM, MICS

Analog

Infrared

Implantable device

Power supply

Processor

Power management

Transceiver

Interface


Review summaries
Review summaries Area Networks (WPANs)

  • Review of >40 published papers

    • Most of efforts are on implementation

    • Communication is not optimized

  • Suitable frequency band

    • Inductive link: <20MHz

    • MICS, ISM and UWB link: < 5GHz

  • IEEE standards15.4b @ 2.4GHz and UWB @ 3~5GHz are OK for low data rate application

    • The data rate and receiver sensitivity can support through body propagation


Characteristic of implantable ban
Characteristic of implantable BAN Area Networks (WPANs)

  • Through body attenuation

    • Compared with free space pathloss (n=2,3,4), there is an additional 30-35dB attenuation at small distance in the far field

    • “Towards a propagation model for wireless biomedical applications,” ICC 2003

  • Energy couple


New issues of ban
New issues of BAN Area Networks (WPANs)

  • Power issue

    • Cortical stimulation

  • Data rate issue

    • 250kbps is not high enough

  • Coexistence issue

    • among wearable device and implanted device

      • Capture effect prefers wearable device to implanted device

    • among BAN piconets

  • Carrier sense issue

    • among implanted devices


Scenarios
Scenarios Area Networks (WPANs)

IEEE 802.15.4b network @ 2.4GHz ISM band,

1mW transmission power

B1

B2

A2

A1

A3

Piconet A

Piconet B


Reception power analysis
Reception power analysis Area Networks (WPANs)

Assumption

20mm tissue media

(-40dB tissue attenuation)

Maximal distance from implant

to an external receiver is <2m


Carrier sense analysis
Carrier sense analysis Area Networks (WPANs)

Assumption

20mm tissue media

(-40dB tissue attenuation)

Free space devices can sense

activity of implant when

distance is <2m

Implant devices can sense

activity of another implant

when free space distance

is <0.2m


Coexistence among ban piconets
Coexistence among BAN piconets Area Networks (WPANs)

Assumption

two piconets

-30dBm adjacent channel

limit

1m from implant to external

receiver

Minimal separation between two

piconets in adjacent channels

should be >3m

Interference from a free space device

to implantable device


Conclusions
Conclusions Area Networks (WPANs)

  • Summaries of implant device research

  • New issues to consider implantable devices in BAN

    • Power issue

      • Cortical stimulation

    • Data rate issue

      • Up to 2Mbps

    • CCA issue

      • Carrier sense among implants

    • Coexistence of BAN piconet

      • Interference from free space signal to implantable signal


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