LE Audio BIS

BIS

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Broadcast Isochronous Stream -- one-to-many audio delivery without connections (e.g. Auracast public broadcasts).

    


    
    
    

      다른 명칭:
      
      Broadcast Isochronous Stream
      
    

    
  


  




  
  

    
Broadcast Isochronous Stream (BIS)


BIS is the broadcast audio transport mechanism within BLE Isochronous Channels. It enables one-to-many audio delivery without requiring connections between the broadcaster and receivers, forming the technical foundation of Auracast broadcast audio.


How BIS Works


A broadcaster creates a BIG (Broadcast Isochronous Group) containing one or more BIS streams, then transmits audio packets on a fixed schedule using Periodic Advertising. Nearby receivers synchronize to the advertising/" class="glossary-term-link" data-term="periodic advertising" data-definition="Connectionless data broadcasting at fixed intervals." data-category="GAP & Advertising">periodic advertising train, discover the BIG parameters, and begin receiving the BIS streams.


Because BIS is connectionless, there is no practical limit to the number of receivers. A single airport gate announcement, for example, can reach thousands of devices simultaneously. The broadcaster manages timing and codec configuration; receivers simply lock onto the stream.


BIG and Encryption


Each BIG can contain multiple BIS streams -- for instance, a left and right audio channel, or multiple language tracks for a public announcement system. The entire BIG shares a single Broadcast Code for encryption. Receivers must know this code (obtained via QR scan, NFC tap, or manual entry) to decrypt the audio.


Performance Characteristics


BIS inherits the timing guarantees of Isochronous Channels. The broadcaster sets the ISO Interval (typically 10 ms for audio), number of subevents for redundancy (pre-transmission count), and the LC3 codec parameters. Because no acknowledgments are sent by receivers, the broadcaster uses pre-transmission (sending the same packet multiple times) to improve reliability over the air.


Use Cases


    

  • Auracast public audio: Airport gates, conference rooms, museums, gyms
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  • Assistive listening: Hearing loop replacement in theaters and houses of worship
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  • Multi-language support: Simultaneous broadcast of multiple language tracks via separate BIS streams within a BIG
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  • Audio sharing: Personal sharing of music between friends' earbuds
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BIS requires Bluetooth 5.2 or later hardware. Suitable chips include the nRF5340 and nRF54H20.

  

  

  
  
  




  
  
Related Terms

  

  

    
    Isochronous Channels
    
    CIS
    
    Auracast
    
    BAP
    
  





  

  
  

  
  

  
  
  

    
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Our glossary covers 90+ BLE technical terms organized by category. Each term includes a definition, related terms, and links to relevant chips and guides.