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

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Block based PHY and Packet Transmission for Low Data Rate In-body WBAN Date Submitted: [ 4 MAY 2009]

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

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Block based PHY and Packet Transmission for Low Data Rate In-body WBAN Date Submitted: [4 MAY 2009] Source: [Dong-Sun Kim1, Jong-Ik Song1, Tae-Ho Hwang1, Young-Hwan Kim1, Jae-Gi Son1, Sang-Jin Hyun1, Ha-Joong Chung1 and Yangmoon Yoon2] Company:[KETI1, KORPA2] Address : [KETI1 ; #68 Yatap-dong Bundang-gu, Seongnam-si, Gyeonggi-do 463-816, South Korea, KORPA2 ; 78 Garak-dong, Songpa-gu, Seoul, 138-803, South Korea] Voice: [+82-31-789-73841, +82-2-2142-21622], FAX: [+82-31-789-75591, +82-2-2142-21992] E-Mail: [dskim@keti.re.kr1, yoon001@paran.com2] Re: [] Abstract: Key requirements of the BAN standards effort, including power, cost and throughput scalability, can be addressed using a scalable block frame structure based on variable block FEC. In addition, BCH encoded 2FSK modulation scheme enable simple structure, low power consumptions and low cost transceiver implementation under in-body communication channel. Purpose: This document is intended as a proposal for addressing the requirements of the TG6 standard. 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.

  2. Contributors KETI : Korea Electronics Technology Institute KORPA : Korea Radio Promotion Agency

  3. Presentation Outline Applicationsfor low data-rate in-body WBAN Regulations for 400MHz MICS Comparison of Modulations Error control frame for Low-data-rate In-body Communication Error Control Frame Structure MAC Channel Access Topology for Implantable Devices Scalable Packet Conclusion Reference

  4. Applicationsfor Implantable BAN • Deep Brain Stimulator • Implantable Cardioverter Defibrillator • Pacemaker • Drug-Delivery Applications for Low-data-rateIn-body WBAN

  5. Regulations for 400MHz MICS • International Reference • ITU-R SA 1346, Sharing between the Meteorological Aids Service and Medical Implant Communications Systems(MICS) operating in the Mobile Service in the Frequency Band 401-406MHz • US standards • US FCC Regulations, available from www.fcc.gov : • 47CFR95.628 • FCC add adjacent spectrum(401~402 & 405~406 MHz) for MICS March 19, 2009, By report and order(FCC09-23)

  6. Comparison of Modulations • Simulation results under channel model 2 • BPSK, 2FSK, 4FSK • System configuration • CM2 400MHz PL model • 10cm away from the body surface, FSPL can be added CM2. • link budget • Carrier Frequency : 403.5MHz • BW : 300kHz • MCS • BFSK – coherent / non-coherent • BPSK – hard decision • 4FSK – coherent / non-coherent • Noise Figure : 5dB • HW loss margin : 5dB • Thermal noise : -174dBm • Tx power : 25μW • Antenna Gain : 0dB

  7. Comparison of Modulations • Simulation results for Different demodulations [AWGN] • BPSK, 2FSK, 4FSK

  8. Error control frame for Low-data-rate In-body Communication • Design objective • Scalable packet size • Advantage : In highly attenuated in-body model, scalable block based transmission would be better than fixed packet based transmission. • Bitmap based data-block management • Power efficiency modulation • High reliability • Header : 16byte, BCH(128,120) • Data : variable block length (Max block FEC: BCH(256,248)) • Error control flow using block map based frame structure. • Bandwidth efficiency modulation • 2FSK

  9. MAC Channel Access • Tow type of device • Coordinator, Implantable Device • Coordinator must scan before transmission • CCA(carrier/energy) each channel over 10 msec • Data transmission • Block map based transmission • Binary Sequencing • 1bit Flow Control • Frame Pending or stop transmission • 48bit address information • 16bit BAN ID, 32bit transceiver ID

  10. Error Control Frame Structure • Header FEC for implantable devices • 32bit Bitmap Block for 32 data blocks • 16bit Ban ID : Medical Service ID • 32bit Transceiver ID : 232 = 4G • Scalable Block Size : • Num of bits in Block : 8/16/32/64/128/256

  11. Topology for Implantable Devices • Maximum Number of Nodes • Under 10 Nodes in 2m (Address: 232 Nodes) • Star Topology • Indirect Transmission • Broadcast • Multi-hop Link D0 Wakeup D3 D2 C Wakeup C D Data Wakeup Data [Indirect Transmission] [Coordinator / Device] D1

  12. Channel Access Sequence Diagram

  13. Retransmission Mechanism

  14. Flow Control

  15. Scalable Packet • PER comparison of variable packet size • Variable packet sizes are not issue under path loss + shadow model [CM2]

  16. Scalable Packet • PER comparison of variable packet size • Variable packet sizes are not issue under path loss + shadow model [CM2]

  17. Conclusion • Transceiver with error control enabled scalable frame block decreases retransmission packet size and increases duty efficiency. • Use 2FSK combinedwith block FEC at low data rate to let simple receiver structure and implementation. • This presentation introduceskey scheme to be applicable to a standard of WBAN

  18. Reference • Kamya Yekeh Yazdandoost and Ryuji Kohno, “Channel Model for Body Area Network(BAN)”, 802.15-08-0780-09-0006, April 2009. • Sukor.M, Ariffin.S, , “Performance Study of Wireless Body Area Network in Medical Environment,” Second Asia International Conference on, 2008 • doc. IEEE 802.15- 08-0 -00-0006 • doc. IEEE 802.15-08-0689-00-0006 • FCC add adjacent spectrum(401~402 & 405~406 MHz) for MICS March 19, 2009, By report and order(FCC09-23) • FCC, Medical implant communications, January 2003, http://wireless.fcc.gov/services/index.htm?job=service_home&id=medical_implant • ArthurW. ASTRIN, Huan-Bang LI, and Ryuji KOHNO, “Standardization for Body Area Networks,” IEICE TRANS. COMMUN., Vol.E92-B, No. 2, pp. 366-372, February 2009 • Tolga Yalcin, and Netlin Ismailoglu, “A Low-Power System-on-Chip for Telecommunications : Single Chip Digital FM Receiver/Demodulator IP,” The thirty-Third Asilomar Conference on Signals, Systems, and Computers, Vol. 1, pp. 24-27, Oct. 1999 • John.G.Proakis, "Digital Communications 2nd Edition.", Mcgraw Hill, ISBN-10 0070509379

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