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Low Latency Audio Communication in Cockpit: Light Communication Use Case

Explore the innovative use case of light communication in the cockpit, providing wireless audio headsets for aircraft crew with enhanced security, safety, and resilience features. Learn about the challenges and performance requirements, and the potential for multi-application use in future aviation technology.

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Low Latency Audio Communication in Cockpit: Light Communication Use Case

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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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