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Light communication Use case: low latency audio in the cockpit

Light communication Use case: low latency audio in the cockpit. Date: 2017-11-02. Authors:. Outline. Context Origin of need Description of use case Conclusion. Light communication in the cockpit: Context. Context:

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Light communication Use case: low latency audio in the cockpit

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  1. Light communicationUse case: low latency audio in the cockpit Date: 2017-11-02 Authors: Simon Bazin (FACTEM)

  2. Outline • Context • Origin of need • Description of use case • Conclusion Simon Bazin (FACTEM)

  3. Light communication in the cockpit:Context Context: • AIRBUS, FACTEM, XLIM part of a Cleansky 2 project : Aircraft Light Communication (ALC) • Purpose: demonstrate LC capabilities, and in particular LC for audio headset • Demonstrator in a flight simulator by December 2019 “This project has received funding from the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation programme under grant agreement No 737645” Simon Bazin (FACTEM)

  4. Light communication in the cockpit:origin of need • AIRBUS wants to provide wireless headsets to aircraft crew • Wireless = increased comfort, potential safety benefit • Main motivations to choose LC against RF: • Security: reduced risk of attacks or eavesdropping • Safety: resilient to EM perturbations, guarantee of service • Worldwide availability, free spectrum Cockpit Simon Bazin (FACTEM)

  5. Light communication in the cockpit:origin of need Main constraints (cont’d): • Fully operational whatever the ambient light conditions (incl. night flight) • Up to 4 headsets at the same time • Standardized solution wanted • Coexistence with other applications: LC internet connection Simon Bazin (FACTEM)

  6. Light communication in the cockpit:Description of the use case Bidirectional Audio communication • LC Access point (one or several) inside cockpit and connected to Audio Server • From one to four Terminals (Audio Headset + Microphone) 6 Simon Bazin (FACTEM)

  7. Light communication in the cockpit:Description of the use case General • 1 (or several) Access Point • Up to 4 Terminals Optical • Near InfraRed on both links Downlink: 890 nm Uplink: 940 nm Coverage • Full cockpit coverage 7 Simon Bazin (FACTEM)

  8. Light communication in the cockpit:Description of the use case Performance • Multi-User: Up to 4 concurrent users • Down link data rate: 2 Mbps • Uplink data rate: 2 Mbps / user • Latency < 3 ms - Challenging! • PER < 10^(-4) (with the latency requirement in mind: no possibility to re-send lost packets) • Full Duplex Communication 8 Simon Bazin (FACTEM)

  9. Light communication in the cockpit:Multi-Application Use Case Quality of Service required to tackle different streams (Data, Audio) from different terminals within the same Access Point range • Coexistence of different applications: • Audio Headsets • Tablets Simon Bazin (FACTEM)

  10. Conclusion • Proposal: consider implementing low latency communication in future 802.11 LC amendment: • Data rates greater than 2 Mbps • At least one PHY mode that would result in latency of less than 3 ms • Enable full duplex PHY layer able work on two different frequencies • Enable quality of service on the MAC packets Simon Bazin (FACTEM)

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