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Overview of IEEE 802.15.13 OWC in Joint Workshop with ITU-T Q18/SG15

Explore recent advancements in IEEE 802.15.13 for Optical Wireless Communication (OWC) discussed at a joint workshop with ITU-T Q18/SG15. Learn about history, scope, technologies, and use cases of OWC in this comprehensive presentation by Volker Jungnickel from Fraunhofer HHI.

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Overview of IEEE 802.15.13 OWC in 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 MAC and PHYs 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 and multiple colors • Device classes: Infrastructure, Mobile, Vehicle • 3 PHYs • 11-266 kb/s (PHY1) , using OOK and VPPM • 1.25-96 Mb/s (PHY2), using OOK and VPPM • 12-96 Mb/s (PHY3) using Color Shift Keying (CSK) • Only low speed modes were ever implemented • Limited penetration into the market, mostly in Korea Volker Jungnickel (Fraunhofer HHI)

  5. January 2018 History of OWC in IEEE 802.15 • 802.15.7r1 • originally intended as revision to include OCC, but quite wide scope • Li-Fi people joined in 2015 when task group was just established • Optical Camera Communications (OCC) • Using cameras in handsets or specific cameras in cars • Low-speed communications with high angular resolution (via pixels) • Allows high-density scenarios (e.g. traffic jam) • Broadcast topologyonly • Variousnew PHY modes • 802.15.7r1 today • D2 recently passed through 802.15 WG letter ballot w/o Li-Fi • 802.15.7r1 = 802.15.7 + OCC • Li-Fiisconsideredbynewtaskgroup TG13 Volker Jungnickel (Fraunhofer HHI)

  6. January 2018 History of OWC in IEEE 802.15 • 802.15.13 • Established March 2017 in Dajeon (Korea) • Dedicated PHYs and MAC for Li-Fi • Reasonsforsplit • OCC and Li-Fitogether in 802.15.7r1 becameintractable • Two sub-committees in oneroom, nointeraction • OCC just needssimplest MAC (broadcasttopology) • Li-Fineedsmorecomplex MAC (coordinatedtopology) • New MAC needsnewstandard 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-OFDMoffersreasonable performance-complexity trade-off Volker Jungnickel (Fraunhofer HHI)

  11. January 2018 Technologies • Superposition of LOS and NLOS channels, 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  Rate-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 is essential 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 802.15.7-2011 and work on 802.15.7r1 • Early drafts 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 = Early 802.15.7r1 w/o OCC and PHYs 1 and 3 • Further simplifications and overall consolidation • Simplification of previous MAC procedures from 802.15.7-2011 • Consolidation of new PHYs and MAC layer to support Li-Fi features Slide 14 Volker Jungnickel (Fraunhofer HHI)

  15. January 2018 MAC Layer in TG13 • Topologies • P2P • Star • Broadcast • Coordinated(new) • General trend has been to simplify MAC from 802.15.7-2011 while addinganynewfeatures • Guideline is 802.15.4-2015 Slide 15 Volker Jungnickel (Fraunhofer HHI)

  16. January 2018 MAC Layer in TG13 • Consensus tosupportcoordinatedtopologybymeansofdistributed MIMO PHY • Needs newtools in each PHY • Explicit MIMO pilotsforchannelsounding, implicit MIMO pilotsfordatatransport • Corresponding PHY frametypes Slide 16 Volker Jungnickel (Fraunhofer HHI)

  17. January 2018 MAC Layer in TG13 • Advanced network functionalities • Relaying • Heterogeneous RF&OWC • Noconsensus on relaying so far • Consensus tosupportheterogenous RF&OWC at mastercoordinatorlevel Slide 17 Volker Jungnickel (Fraunhofer HHI)

  18. 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 (6 bps/Hz): <100 Mbit/s • Targeting low-energy transmission  battery-/USB-powered mobile devices • Derived from 802.11n and tailored to allow DMT (real-valued waveform) Slide 18 Volker Jungnickel (Fraunhofer HHI)

  19. 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 was added • Pulsed Modulation PHY (PM PHY) • New design from some TG13 members (ETRI, VLNcomm, HHI) • High bandwidth (3-200 MHz) and low spectral efficiency (PAM-16): < 100 Mbit/s • Increased bandwidth and low SNR  power-efficient PHY for advanced frontends • Reed Solomon, PAM, 8B10B Line Code or Hadamard-Coded Modulation (HCM) • Variable MCSs through PAM and #of codes used in HCM • numerology is similar to HB PHY (G.hn), support for distributed MIMO Slide 19 Volker Jungnickel (Fraunhofer HHI)

  20. January 2018 Physical Layers in TG13 • Where to use what PHY? • LB PHY: use of low-cost optical frontends and easily achieve moderate data rates • HB PHY: use advanced optical frontends and achieve moderate-to-high data rates (downlink) • PM PHY: use advanced optical frontends and achieve low-to-moderate data rates (uplink) • LB PHY is mainly intended for current mass market applications (MBB) • HB PHY is useful for eMBB, as it is scalable from moderate up to very high data rates • PM PHY is useful for mMTC, as it is scalable from moderate down to lower data rates • All PHYs are useful for URLLC, as they provide distributed MIMO support Slide 20 Volker Jungnickel (Fraunhofer HHI)

  21. January 2018 TG13 Call for Proposals on OFDM-based PHYs TG13 requests revised proposals for OFDM-based PHYs, in the agreed-upon writing style • PPDU format, Preamble (Synchronization sequence, Channel estimation sequences), Header content, Header check sequence, Channel coding for the header, Channel coding for data with variable code rate, Scrambler, Interleaver Proposals shall be submitted until April 20and will be discussed at the next interim meeting in Warsaw. Proposals can be submitted as slides or text being accompanied by a slide set. Volker Jungnickel (Fraunhofer HHI)

  22. January 2018 Timeline in TG13 Volker Jungnickel (Fraunhofer HHI) Slide 22

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

  24. January 2018 Further information • Previouscontributions on 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 (since March 2017) 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 or presence at IEEE 802 plenaryorinterimmeetings Volker Jungnickel (Fraunhofer HHI)

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

  26. 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)

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

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