1. Date Submitted: [ 14 July, 2008]
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

2. Contents Introduction
7/XX/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

3. Introduction WBAN In-body communications
7/XX/2008
Introduction
WBAN In-body 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
OperatingTime
- SB:8 H
- ESO:20 M -
8 H
11 H
Sensor
CMOS
(240X240,320X320)
CCD
(320X320?)
(320X320)
Dong Kyoo Kim et al., ETRI

4. Data rate Meaning of ‘up to 10Mbps’ for In-body High-data-rate
7/XX/2008
Data rate
Meaning of ‘up to 10Mbps’ for In-body High-data-rate
Compressive image
MPEG2 SD 720i: 6Mbps
MPEG2 SD 640i: 2.7Mbps
Non-compressive image (Examples)
320X240, 9bits, 14fps: 9.68Mbps
640X480, 12bits, 2fps: 7.37Mbps
240X240, 12bits, 2fps: 1.32Mbps
10Mbps is enough for In-body High-data-rate?
How to achieve this data rate?
Dong Kyoo Kim et al., ETRI

5. Power consumption Power system Power sources
7/XX/2008
Power consumption
Power system
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

6. Frequency band Dedicated frequency allocation: ?
7/XX/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

7. IEEE802.15.4a Sub-GHz band(USA/Europe)
7/XX/2008
Frequency band
Sub-GHz UWB
B/W should be greater than or equal to 20% of carrier frequency
Possible channel plan
IEEE a Sub-GHz band(USA/Europe)
60MHz
90MHz
120MHz
Low-power Transmission(Korea/Japan)
60MHz
Dong Kyoo Kim et al., ETRI

8. Frequency band Pros Cons 450MHz Not-bad transmission loss due to body
7/XX/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

9. Transmission Structure
7/XX/2008
Transmission Structure
Link symmetry (Up-link and Down-link)
Symmetric: Two links have the same spec (and same freq or not)
Asymmetric: Two links have different specs (and diff freq or not)
Duplex
TDD: strong adv. when data rate varying, complex control circuits,
apt for links with same freq
FDD: No switch over, apt for links with diff freq
Network
Peer-to-peer
Networked (more than 2 devices): relaxation of HDR node,
extend comm. distance
Up-link: High-data-rate (Images,…)
Poor
Rich
Down-link: Spontaneous transmission (Control,…)
HDR node
Low Power
Small size
Not-enough EIRP
HDR Sink
Non-strict Power limit
Non-strict size limit
No limit of using available
high-tech algorithms
Dong Kyoo Kim et al., ETRI

10. Transmission Structure
7/XX/2008
Transmission Structure
Modulation: Low power, 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

11. Transmission Structure
7/XX/2008
Transmission Structure
Our preference
Asymmetric link: HDR(216~322MHz), LDR(401~406MHz)
Duplex: FDD
Network: Relay device
In-body
Out-body, Air
Up-link: High-data-rate (10Mbps)
Down-link: Low-data-rate (MICS,MedRadio)
HDR node
Low Power
Small size
Not-enough EIRP
HDR Sink
Non-strict Power limit
Non-strict size limit
No limit of using available
high-tech algorithms
Relay device
Non-strict power limit
Non-strict size limit
Relaying data and messages
Dong Kyoo Kim et al., ETRI

12. Summary Discussed considerations Important factors Comments and Q&A?
7/XX/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