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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Considerations on High-data-rate In-body communications for WBAN] Date Submitted: [ 14 July, 2008] Source: [Dong Kyoo Kim, and Hyung Soo Lee] Company [ETRI]

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slide1

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

Submission Title: [Considerations on High-data-rate In-body communications for WBAN]

Date Submitted: [ 14 July, 2008]

Source: [Dong Kyoo Kim, and Hyung Soo Lee] Company [ETRI]

Contact: Dong Kyoo Kim, ETRI, Korea

Voice:[+82 42-860-5620], FAX: [+82 42-860-5218], E-Mail:[kdk3606@etri.re.kr]

Re: [n/a]

Abstract:[Presentation on high-data-rate in-body communications for WBAN]

Purpose: [To discuss what is considered about high-data-rate in-body communications for WBAN]

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.

Dong Kyoo Kim et al., ETRI

considerations on high data rate in body communications for wban

7/14/2008

Considerations on High-data-rate In-body communications for WBAN

Dong Kyoo Kim, and Hyungsoo Lee

ETRI

Dong Kyoo Kim et al., ETRI

contents
Contents
  • Introduction
  • Considerations on In-body High-data-rate communication such as Data rate and others
    • Data rate
    • Power consumption
    • Frequency band
    • Transmission structure
  • Summary

Dong Kyoo Kim et al., ETRI

introduction
Introduction
  • Implantable(or In-body) BAN communications
    • Low-data-rate: eg) Pacemaker, …
    • High-data-rate: eg) Capsule endoscope, …
  • Capsule endoscope: Typical example

Dong Kyoo Kim et al., ETRI

data rate
Data rate
  • Meaning of ‘up to 10Mbps’ for implantable high-data-rate BAN
    • Compressive images
      • MPEG2 SD 720i: 6Mbps
      • MPEG2 SD 640i: 2.8Mbps *
    • Non-compressive images
      • 320X240, 9bits, 14fps: 9.68Mbps
      • 640X480, 12bits, 2fps: 7.37Mbps
      • 240X240, 12bits, 2fps: 1.32Mbps
  • 10Mbps is enough for in-body high-data-rate BAN?
    • May enough for data rate (Application-layer, or MAC layer)
    • May not enough for raw data rate (PHY-layer)

* Capsule endoscope using an implant WBAN, Kenichi Takizawa1, NICT, IEEE 802.15-08-0154-00-0006

Dong Kyoo Kim et al., ETRI

power consumption
Power consumption
  • Power system in implantable BAN
    • Small size
    • Low power supply
  • Power sources
    • Wireless power transmission, Power harvest, …
    • Small-sized battery
  • Example: Silver-Oxide battery for Capsule endoscope
    • Size: around 10mm (diameter), from 1mm to 10mm(height)
    • Capacity: various (under 1mA or over 200mA, depends on battery size)
      • It is hard to use more than 150mW as far as I know
      • To make it worse, capsule endo. consists of power hungry components such as image sensor, white LEDs, …
  • PHY and MAC should consider this power system characteristics

Dong Kyoo Kim et al., ETRI

frequency band
Frequency band
  • Dedicated frequency allocation: ?
  • Typical unlicensed transmission: ISM
    • 960MHz / 2.4GHz / 5GHz (EIRP depends on region)
  • IEEE802.15.4a Sub-GHz band: UWB
    • 250MHz ~ 750MHz (with -41.3dBm/MHz EIRP)
  • Unlicensed low-power transmission: Korea/Japan
    • ~ 322MHz (with -41.3dBm/MHz EIRP)

250 322 750 902 928 2400 2450 5725 5875

Frequency (MHz):

ISM:

36dBm

36dBm

36dBm

IEEE802.15.4a

Sub-GHz band:

-41.3dBm/MHz

Low-power

Transmission

(Korea/Japan):

-41.3dBm

/MHz

Dong Kyoo Kim et al., ETRI

frequency band1
Frequency band
  • Possible channel plan
    • Each channel bandwidth is different from others
  • More clever way?

260 320 405 495 540 660

60MHz

90MHz

120MHz

IEEE802.15.4a Sub-GHz band(USA/Europe)

Low-power Transmission(Korea/Japan)

60MHz

Dong Kyoo Kim et al., ETRI

frequency band2
Frequency band

Distance: 15cm (body)*

100

450MHz

  • Pros
    • Not-bad transmission

loss due to body

    • Wide bandwidth
    • Unlicensed
  • Cons
    • Coexistence problem
    • Others ?

90

Total Loss

80

70

60

Radiation Loss

50

안테나손실

Loss

(dB)

40

Attenuation Loss

30

Ant Loss

20

10

0

2

.01

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

Freq.(GHz)

  • J. Ryu et al, “Low Power OOK Transmitter for wireless capsule endoscope,” IEEE/MTT-S International, pp. 855-858

Dong Kyoo Kim et al., ETRI

transmission structure
Transmission Structure
  • Link symmetry (Up-link and Down-link)
    • Symmetric: Two links have the same spec
    • Asymmetric: Two links have different specs (usually, today’s comm.)
  • Duplex
    • FDD: No switch over, apt for links with diff freq (old-fashioned, voice only)
    • TDD: strong adv. when data rate varying, complex control circuits,

apt for links with same freq (most legacy data comm.)

  • Network
    • Peer-to-peer
    • Networked (more than 2 devices): relaxation of node’s capability,

or extend comm. distance and etc…

Up-link: High-data-rate (Images,…)

Sink

Node

Down-link: Spontaneous transmission (Control,…)

  • Dev outside body
  • Non-strict Power limit
  • Non-strict size limit
  • No limit of using available
  • high-tech algorithms
  • Implantable dev
  • Low Power
  • Small size
  • Not-enough EIRP

Dong Kyoo Kim et al., ETRI

transmission structure1
Transmission Structure
  • Modulation: Low power and high-data-rate enabled.
    • Single-carrier, multi-carrier
    • OOK, FSK, PSK, QAM, and etc…
  • Required BER
    • 10-8 for video
    • 10-4 for audio
    • Other services
  • Channel coding
    • Convolutional
    • RS
    • Turbo, LDPC, and etc…

Dong Kyoo Kim et al., ETRI

transmission structure2
Transmission Structure
  • Our preference
    • Up-link(Sub-GHz), Down-link(MICS, MedRadio)
    • Link: Asymmetric
    • Duplex: FDD
    • Network: Relay device

Out-body, Air

In-body

Up-link: High-data-rate (10Mbps)

Node

Sink

Down-link: Low-data-rate (MICS,MedRadio)

  • Implantable dev
  • Low Power
  • Small size
  • Not-enough EIRP
  • Dev outside body
  • Non-strict Power limit
  • Non-strict size limit
  • No limit of using available
  • high-tech algorithms

Relay

  • Relaying dev
  • Non-strict power limit
  • Non-strict size limit
  • Relaying data and messages

Dong Kyoo Kim et al., ETRI

summary
Summary
  • Discussed considerations
    • Data rate
    • Power consumption
    • Frequency band
    • Transmission structure
  • Important factors
    • Spatial efficiency (circuit complexity)
    • Power efficiency
    • Latency
    • Interference
    • Etc…
  • Comments and Q&A?

Dong Kyoo Kim et al., ETRI