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IEEE 802.15.13 Multi Gbit/s Optical Wireless Communication Joint Workshop with ITU-T Q18/SG15

IEEE 802.15.13 Multi Gbit/s Optical Wireless Communication Joint Workshop with ITU-T Q18/SG15. Date: 2018-02-07 Place: Geneva, Switzerland. Authors:. January 2018. Abstract.

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IEEE 802.15.13 Multi Gbit/s Optical Wireless Communication Joint Workshop with ITU-T Q18/SG15

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  1. IEEE 802.15.13Multi Gbit/s Optical Wireless CommunicationJoint Workshop with ITU-T Q18/SG15 Date: 2018-02-07 Place: Geneva, Switzerland Authors: Volker Jungnickel (Fraunhofer HHI)

  2. January 2018 Abstract This presentation contains an overview of recent work in the IEEE 802.15 task group TG13 “Multi Gbit/s Optical Wireless Communication” for the joint workshop with the ITU-T Q18 SG15 G.vlc project. Volker Jungnickel (Fraunhofer HHI)

  3. January 2018 Table of Content • Introduction to 802.15.13 group • History of OWC in 802.15 • Motivation, Use-cases and Technologies • TG13 Scope • Structure of TG13 draft D2 • based on the 802.15.7r1 with major changes • Introduction into PHYs and MAC targeted in TG13 • Timeline in TG13 • Questions from G.vlc to TG13 • Questions from TG13 to G.vlc Volker Jungnickel (Fraunhofer HHI)

  4. January 2018 History of OWC in IEEE 802.15 • 802.15.7-2011 • Non-directed, P2MP using white light • Device classes: Infrastructure, Mobile, Vehicle • 3 PHYs • 11-100 kb/s (PHY1) • 1.25-96 MB/s (PHY2), using OOK and VPPM • 12-96 MB/s using Color Shift Keying (CSK, PHY3) • Only low speed modes were ever implemented • Standardization was dominated by one big company • Few products so far from within Korea • In other parts of the world it is considered as a failure Volker Jungnickel (Fraunhofer HHI)

  5. January 2018 History of OWC in IEEE 802.15 • 802.15.7r1 • originally intended as revision only including OCC, but wide scope • Li-Fi people joined in 2015 when task group was established • Optical Camera Communications (OCC) • Using cameras in handsets or specific cameras in cars • Low-speed communications with angular resolution (via pixels) • Allows high-density scenarios (e.g. traffic jam) • Needs onlybroadcasttopology, variousnew PHY modes • Localization is also possible using data base but out of scope • 802.15.7r1 today • D2 is passed through 802.15 WG letter ballot w/o Li-Fi • 802.15.7r1 = 802.15.7 + OCC • Li-Fiisconsidered in newtaskgroup TG13 Volker Jungnickel (Fraunhofer HHI)

  6. January 2018 History of OWC in IEEE 802.15 • 802.15.13 • Established in March 2016 in Dajeon (Korea) • Dedicated PHYs and MAC for Li-Fi • Reasonsforsplitfrom OCC • OCC and Li-Fi in 802.15.7r1 becameintractable • Two sub-committees in oneroom, nointeraction • OCC just requiressimplest MAC (broadcasttopology) • Li-Firequiresmorecomplex MAC (coordinatedtopology) • New MAC needs a newstandard newtaskgroup TG13 Volker Jungnickel (Fraunhofer HHI)

  7. January 2018 Motivation of TG13 • Many new world records for high data rates • Up to 10 Gb/s short range using RGBY LEDs • Several 100 Mb/s single-color in wide beams (few meters) • New technologies, not included in 802.15.7 • Discrete multi-tone (DMT, also denoted as DC-OFDM) • Closed-loop rate adaptation • Multiple-input multiple-output (MIMO) • Wavelength-division multiplexing (WDM) • Mobility supportbetween Li-Ficells • Mobility supportbetween Li-Fiand RF Volker Jungnickel (Fraunhofer HHI)

  8. January 2018 Use Cases • Indoor, Office, Home • Data center, Industrial, Secure Wireless Volker Jungnickel (Fraunhofer HHI)

  9. January 2018 Use Cases • Vehicular Communications • Wireless Backhaul, e.g. for small radio cells, video surveillance, LAN bridging Volker Jungnickel (Fraunhofer HHI)

  10. January 2018 Technologies • Limited bandwidth of LED (10-20 MHz, with advanced drivers up to 200 MHz) • Indoor lighting is bright  high SNR • High spectral efficiency + high bandwidth enable Gbit/s data rates • DC-OFDMasenablerwithreasonablecomplexity Volker Jungnickel (Fraunhofer HHI)

  11. January 2018 Technologies • Superposition of LOS and NLOS, due to diffuse reflections • Depends on K-factor (ratio between LOS and diffused light) • K-factoris not always high • Ripple and fades • In mobile scenarios, any K can happen at any time  Closed-loop adaptive transmission Volker Jungnickel (Fraunhofer HHI)

  12. January 2018 Technologies • User is served by multiple luminaries • Overlapping Li-Fi cells need horizontal handover + interference management • Non-overlapping Li-Fi cells need vertical handover to Wi-Fi  mobility support for users in larger areas Volker Jungnickel (Fraunhofer HHI)

  13. January 2018 TG13 Scope • This standard defines a Physical (PHY) and Media Access Control (MAC) layer using light wavelengths from 10,000 nm to 190 nm in optically transparent media for optical wireless communications. • The standard is capable of delivering data rates up to 10 Gbit/s at distances in the range of 200 meters unrestricted line of sight. • It is designed for point-to-point and point-to-multi point communications in both non-coordinated and coordinated topologies. • For coordinated topologies with more than one peer coordinator there will be a master coordinator. • The standard includes adaptation to varying channel conditions and maintaining connectivity while moving within the range of a single coordinator or moving between coordinators. Volker Jungnickel (Fraunhofer HHI)

  14. January 2018 Structure of TG13 D2 • Draft history • TG13 work is legacy of work on 802.15.7-2011 and 802.15.7r1 • Draft for 802.15.7r1 = 802.15.7-2011 + OCC + Li-Fi • 2 new Li-Fi PHYs • 3 new PHYs for OCC • New MAC layer procedures for both, OCC and Li-Fi • Initial Draft for 802.15.13 = 802.15.7r1 w/o OCC and w/o PHYs I and III • Further simplification and consolidation • Simplification of existing MAC procedures • Consolidation of new PHYs and MAC layer to support Li-Fi Slide 14 Volker Jungnickel (Fraunhofer HHI)

  15. January 2018 Physical Layers in TG13 High-bandwidth OFDM PHY Shannon’s theorem C=B*log2(1+SNR) Spectral Efficiency LB OFDM PHY Pulsed Modulation PHY Bandwidth • Low-bandwidth OFDM PHY (LB PHY) • Low bandwidth (5…20 MHz), high spectral efficiency (64-QAM): <100 Mbit/s • Targeting low-energy transmission  battery-driven mobile devices • Derived from 802.11n and tailored to allow DMT (real-valued waveform) Slide 15 Volker Jungnickel (Fraunhofer HHI)

  16. January 2018 Physical Layers in TG13 • High-bandwidth OFDM PHY (HB PHY) • High bandwidth (25…1.000 MHz), high spectral efficiency (10 bps/Hz): <10 Gbit/s • Derived from G.hn (2015) by scaling bandwidth up to 1 GHz • Support for distributed MIMO has been added • Pulsed Modulation PHY (PM PHY) • New design based on own ideas in TG13 • High bandwidth (3-200 MHz), low spectral efficiency (PAM-16): < 100 Mbit/s • Increased bandwidth and lower SNR  more power-efficient than LB OFDM PHY • RS channel code, PAM, 8B10B Line Code/Hadamard-Coded Modulation (HCM) • Variable MCSs through PAM and #of codes used in HCM • Support for distributed MIMO Slide 16 Volker Jungnickel (Fraunhofer HHI)

  17. January 2018 Physical Layers in TG13 • Where to use what PHY? • LB PHY: use low-cost optical frontends and easily achieve moderate data rates • PM PHY: use advanced optical frontends and achieve low-to-moderate data rates (uplink) • HB PHY: use advanced optical frontends and achieve moderate-to-high data rates (downlink) • LB PHY is mainly intended for current mass market applications (standard MBB) • HB PHY is useful for eMBB, as it is scalable from moderate up to very high data rates • PM PHY is also useful for mMTC, as it is scalable from moderate down to low data rates • All PHYs are useful for URLLC, as they provide distributed MIMO support Slide 17 Volker Jungnickel (Fraunhofer HHI)

  18. January 2018 MAC Layer in TG13 • Topologies • P2P • Star • Broadcast • Coordinated(new) • Consensus tosupportcoordinatedtopology bymeansofdistributed MIMO in the PHY • Needs newtools in each PHY • Explicit MIMO pilotsforchannelsounding • Implicit MIMO pilotsfordatatransport • Correspondingframetypes Slide 18 Volker Jungnickel (Fraunhofer HHI)

  19. January 2018 MAC Layer in TG13 • General trend is to simplify old MAC proceduresfrom 802.15.7-2011 • Advanced network functionalities • Relaying • Heterogeneous RF&OWC • Noconsensus on relayingyet • Consensus tosupportheterogenous RF&OWC at mastercoordinator Slide 19 Volker Jungnickel (Fraunhofer HHI)

  20. January 2018 Timeline in TG13 Volker Jungnickel (Fraunhofer HHI) Slide 20

  21. January 2018 Timeline in TG13 Volker Jungnickel (Fraunhofer HHI)

  22. January 2018 Further information • Recentcontributions in Li-Fi in TG7r1 (until March 2017) https://mentor.ieee.org/802.15/documents?is_dcn=DCN%2C%20Title%2C%20Author%20or%20Affiliation&is_group=007a • More recent contributions on Li-Fi in TG13 https://mentor.ieee.org/802.15/documents?is_dcn=DCN%2C%20Title%2C%20Author%20or%20Affiliation&is_group=0013 • Access to TG13 draftspecificationrequiresvotingrights in 802.15 orpresence at IEEE 802 meetings Volker Jungnickel (Fraunhofer HHI)

  23. January 2018 Questions from G.vlc to TG13 • Q: … • A: … • Q: … • A: … Volker Jungnickel (Fraunhofer HHI)

  24. January 2018 Questions from TG13 to G.vlc • Q: What PHYs are being used in G.vlc? • A: … • Q: How to resolve coexistence betw. PHYs from G.vlc and 802.15.13? • A: … • Q: Under what conditions G.hn PHY could be integrated into 802.15.13 MAC? • A: … Volker Jungnickel (Fraunhofer HHI)

  25. January 2018 Thank you！ Volker Jungnickel (Fraunhofer HHI)

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