1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
7/14/2008
Project: IEEE P 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:[ ], FAX: [ ],
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 P 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 P
Dong Kyoo Kim et al., ETRI
<author>, <company>

2. 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

3. Contents Introduction
7/14/2008
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

4. Introduction Capsule endoscope: Typical example
7/14/2008
Introduction
Implantable(or In-body) BAN communications
Low-data-rate: eg) Pacemaker, …
High-data-rate: eg) Capsule endoscope, …
Capsule endoscope: Typical example
PillCam(SB, ESO)
NORIKA 3
Endo Capsule
MiRO
Company
Given Imaging
RF System Lab
Olympus
KIST
Size
(mmXmm)
SB: 11X26
9X23
11X26
10.8X24
fps
- SB:2 frame/sec
- ESO:14 ima ges/sec
30 frames/sec
2 frames/sec
3frames/sec
Operating Time
- SB:8 H
- ESO:20 M -
8 H
11 H
Image
Resolution
CMOS
(240X240,320X320)
CCD
(320X320?)
(320X320)
Dong Kyoo Kim et al., ETRI

5. Data rate Meaning of ‘up to 10Mbps’ for implantable high-data-rate BAN
7/14/2008
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
Dong Kyoo Kim et al., ETRI

6. Power consumption Power system in implantable BAN Power sources
7/14/2008
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

7. Frequency band Dedicated frequency allocation: ?
7/14/2008
Frequency band
Dedicated frequency allocation: ?
Typical unlicensed transmission: ISM
960MHz / 2.4GHz / 5GHz (EIRP depends on region)
IEEE a Sub-GHz band: UWB
250MHz ~ 750MHz (with -41.3dBm/MHz EIRP)
Unlicensed low-power transmission: Korea/Japan
~ 322MHz (with -41.3dBm/MHz EIRP)
Frequency (MHz):
ISM:
36dBm
36dBm
36dBm
IEEE a
Sub-GHz band:
-41.3dBm/MHz
Low-power
Transmission
(Korea/Japan):
-41.3dBm
/MHz
Dong Kyoo Kim et al., ETRI

8. IEEE802.15.4a Sub-GHz band(USA/Europe)
7/14/2008
Frequency band
Possible channel plan
Each channel bandwidth is different from others
More clever way?
IEEE a Sub-GHz band(USA/Europe)
60MHz
90MHz
120MHz
Low-power Transmission(Korea/Japan)
60MHz
Dong Kyoo Kim et al., ETRI

9. Frequency band Pros Cons 450MHz Not-bad transmission loss due to body
7/X14/2008
Frequency band
Distance: 15cm (body)*
Pros
Not-bad transmission
loss due to body
Wide bandwidth
Unlicensed
Cons
Coexistence problem
Others ?
450MHz
안테나손실 10 20 30 40 50 60 70 80 90
100
.01
0.2
0.4
0.6
0.8 1
1.2
1.4
1.6
1.8 2
Freq.(GHz)
Total Loss
Ant Loss
Attenuation Loss
Radiation Loss
Loss
(dB)
J. Ryu et al, “Low Power OOK Transmitter for wireless capsule endoscope,” IEEE/MTT-S International, pp
Dong Kyoo Kim et al., ETRI

10. Transmission Structure
7/14/2008
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,…)
Node
Sink
Down-link: Spontaneous transmission (Control,…)
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
Dong Kyoo Kim et al., ETRI

11. Transmission Structure
7/14/2008
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

12. Transmission Structure
7/14/2008
Transmission Structure
Our preference
Up-link(Sub-GHz), Down-link(MICS, MedRadio)
Link: Asymmetric
Duplex: FDD
Network: Relay device
In-body
Out-body, Air
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

13. Summary Discussed considerations Important factors Comments and Q&A?
7/14/2008
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