doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> 7/14/2008 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 <author>, <company>

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 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

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

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 802.15-08-0154-00-0006 Dong Kyoo Kim et al., ETRI

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

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) 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) Frequency (MHz): 250 322 750 902 928 2400 2450 5725 5875 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

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? 260 320 405 495 540 660 IEEE802.15.4a Sub-GHz band(USA/Europe) 60MHz 90MHz 120MHz Low-power Transmission(Korea/Japan) 60MHz Dong Kyoo Kim et al., ETRI

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. 855-858 Dong Kyoo Kim et al., ETRI

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

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

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

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