1. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 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. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) July 2008 H. S. Lee ETRI D. Y. Kim and C. S. Eun Chungnam Univ. S. M. Ryu CASUH Multi preamble to support Single MAC for multi PHY

3. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 3 Multiple Preamble Concept Lock time MessageEOF Fixed Header VariableMultiple Lock timeMessage Preamble EOF Header Conventional Frame Structure Suggested Frame Structure Sync Aide & Command Multiple Preamble contains short message Preamble

4. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 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 PHY We should not receive during adjacent radio is transmitting to avoid spurious interference

5. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 5 Quoted from doc.: IEEE 802. 15-08-0446-00-0006 written by Dr. Youjin Kim et al ETRI How to enhance QoS by MAC

6. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 6 How to avoid mutual interference I0I0 I1I1 I2I2 I3I3 O1O1 O2O2 R R T T T R T R R T T R R R T Unified Frame R R R R T T T T R R T T R R R T T R R T T T TR R

7. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 7 Why 64bit preamble 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 effect ubiquitous service cell planning needs 3-D interference

8. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 8 Process Gain for Medical Use ~7dB Non-Medical Medical Spread Spectrum Block ~14dB Medical ~Kbps Non- Medical 100Kbps Environment SNR might be under the 0 dB

9. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 9 2.4GHz Fading Effect SNR of received signal is drastically degraded

10. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 10 2-D 3-D ubiquitous GC1 GC2 GC4 GC8 GC26 Self Organizing MAC is inevitable Multi Preamble GC1 GC2 GC3 GC8 Ubiquitous Cell Planning

11. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 11 False Alarm & False Dismissal Probability for Binary CDMA N=64

12. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 12 N=128 False Alarm & False Dismissal Probability for Binary CDMA

13. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 13 False Alarm & False Dismissal Probability for WBAN 64bit is not enough but 128 bit is too high ; so we suggest multi Preamble

14. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 14 127 bit Gold Code Cross Correlation value

15. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 15 Simulation Result of Multi code Error Rate

16. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 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. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 17 Comparison Numerical Analysis and Simulation Results

18. doc.: IEEE 802. 15-08-0485-01-0006 Submission H.S.Lee(ETRI),D.Y.Kim (Chungnam Univ.), & S.M.Ryu(Casuh) Slide 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