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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: [ Multi preamble to support Single MAC for multi PHY ] Date Submitted: [14 July 2008] Source: [H.S.Lee, D. Y. Kim, C. S. Eun, S. M. Ryu] Company [ETRI, Chungnam Univ., Casuh]

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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: [Multi preamble to support Single MAC for multi PHY] Date Submitted: [14 July 2008] Source: [H.S.Lee, D. Y. Kim, C. S. Eun, S. M. Ryu] Company [ETRI, Chungnam Univ., Casuh] Address [220 Yuseong-gu, Gung-dong, Daejeon, Korea] Voice: [+82-31-709-5577, +82-42-821-6862], FAX: [+82-31-709-5578, +82-42-823-5586] E-Mail:[hsulee@etri.re.kr, dykim@cnu.kr, retaw@casuh.com] Re: [Contribution to IEEE 802.15.6 Meeting, July 2008] Abstract: [Propose multi preamble to enhance transmission performance] Purpose: [Proposal] 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. Multi preamble to support Single MAC for multi PHY July 2008 H. S. Lee ETRI D. Y. Kim and C. S. Eun Chungnam Univ. S. M. Ryu CASUH

  3. Multiple Preamble Concept Fixed Multiple Variable Sync Aide Preamble Lock time Message EOF Header Conventional Frame Structure Sync Aide & Command Preamble Lock time Message EOF Header Suggested Frame Structure Multiple Preamble contains short message

  4. Why Preamble is so important ?☞ to synchronize frame Why frame synchronization is so important ? ☞ to demodulate message ☞ to enhance QoS of PHY with MAC Preamble detection error rate should be smaller than WBAN application requirement ☞ to reduce interference among different PHYWe should not receive during adjacent radio is transmitting to avoid spurious interference

  5. How to enhance QoS by MAC Quoted from doc.: IEEE 802. 15-08-0446-00-0006 written by Dr. Youjin Kim et al ETRI

  6. Unified Frame R R T R R R T T R R R T R R T R T R T T T T T T R R R T T R R T R T R T R T R T How to avoid mutual interference I0 I1 I2 I3 O1 O2

  7. Why 64bitpreamble length is not enough ? ☞ Environment SNR might be under the 0 dB Spread Spectrum System operates in such condition WBAN Medical Application needs Spread Spectrum ☞ 2.4GHz fading effect is so severe SNR of received signal is drastically degraded We should consider enough margin ☞ Mutual Interference among adjacent cell’s becomes 3-D effectubiquitous service cell planning needs 3-D interference

  8. Non-Medical Spread Spectrum Block ~14dB Medical Non-Medical 100Kbps Medical ~Kbps ~7dB Process Gain for Medical Use Environment SNR might be under the 0 dB

  9. 2.4GHz Fading Effect SNR of received signal is drastically degraded

  10. GC8 GC1 GC1 GC2 GC8 GC4 GC26 GC2 GC3 Multi Preamble Ubiquitous Cell Planning • 2-D • 3-D ubiquitous Self Organizing MAC is inevitable

  11. False Alarm & False Dismissal Probability for Binary CDMA N=64

  12. False Alarm & False Dismissal Probability for Binary CDMA N=128

  13. False Alarm & False Dismissal Probability for WBAN 64bit is not enough but 128 bit is too high ; so we suggest multi Preamble

  14. 127 bit Gold Code Cross Correlation value

  15. Simulation Result of Multi code Error Rate

  16. Multi Preamble Pros & Cons • PROS • Enhance Preamble Detection Rate • Shorten transmission time • Reduce Power Consumption • Assign special preamble • Emergency • PHY Classification • Cell Planning • transmission speed • CONS • Complex Hardware ? • Time Loss ?

  17. Comparison Numerical Analysis and Simulation Results

  18. Conclusion • Multi Preamble Concept is suitable for WBAN • Reduce transmission time & Power consumption • Enhance QoS by perfect frame synchronization • Special Preamble is possible ; emergency, cell planning, etc • Demerits of multi preamble is negligible • 128bit correlator H/W is not burden now • Longer Preamble length is not time loss • Multi Preamble could support new service in WBAN application • Supply tool to make single MAC to support scalable data rate • Support special purpose service like emergence broadcasting • Increase mobile channel capacity by Pico-cell Hand-over Planning • Diversity, Selective Hopping, Service converging, etc

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