Introducing
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Bluetooth® LE Audio
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A guide to the latest Bluetooth specifications and how they will
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change the way we design and use audio and telephony products.
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by Nick Hunn
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First published January 2022
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Paperback ISBN: 979-8-72-723725-0
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Hardback ISBN: 979-8-78-846477-0
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Copyright © 2022 Nick Hunn
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All rights reserved.
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The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc.
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and any use of such marks is with permission. Other trademarks and trade names are those
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of their respective owners.
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www bleaudio.com | www.nickhunn.com
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2
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Acknowledgements
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I would like to thank everyone who has helped towards the existence of this
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book. Without the work of many brilliant people contributing to the
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specifications, there would be nothing to write about. They are too numerous
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to list here, but they are recorded in each of the Bluetooth® documents. Trying
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to develop standards of this complexity results in many days and evenings of
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wide-ranging discussions, which have been both challenging and enjoyable. It
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has been a pleasure to work with so many people of passion who are always
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ready to spend time explaining the intricacies of wireless, audio and its
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application.
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For taking the time to read through the drafts and coming back with detailed
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comments, I would particularly like to thank Richard Einhorn, Kanji Kerai,
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Ken Kolderup, Mahendra Tailor, Jonathan Tanner and Martin Woolley. Their
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input, from a variety of different reader angles, has helped make this into a
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much better book than it would otherwise have been. I must also thank the
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Bluetooth SIG for their help and support.
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For giving me permission to use the image of Figure 1.8, and also for playing a
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pivotal role in kickstarting the whole world of hearables, many thanks to
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Nikolaj Hviid of Bragi.
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Finally, to my wife, Chris, for reading the endless drafts, as well as the final
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book from cover to cover multiple times, questioning everything, as well as
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putting up with the many hours I spent writing it.
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3
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4
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Contents
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Chapter 1. The background and heritage ................................................................................ 11
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1.1 The hearing aid legacy...................................................................................................... 19
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1.2 Limitations and proprietary extensions ......................................................................... 20
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1.3 What’s in a hearable? ........................................................................................................ 24
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Chapter 2. The Bluetooth® LE Audio architecture ............................................................... 29
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2.1 The use cases ..................................................................................................................... 29
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2.2 The Bluetooth LE Audio architecture .......................................................................... 38
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2.3 Talking about Bluetooth LE Audio ............................................................................... 48
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Chapter 3. New concepts in Bluetooth® LE Audio .............................................................. 51
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3.1 Multi-profile by design..................................................................................................... 51
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3.2 The Audio Sink led journey ............................................................................................ 51
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3.3 Terminology ...................................................................................................................... 52
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3.4 Context Types ................................................................................................................... 56
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3.5 Availability ......................................................................................................................... 60
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3.6 Audio Location ................................................................................................................. 60
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3.7 Channel Allocation (multiplexing) ................................................................................. 61
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3.8 Call Control ID - CCID .................................................................................................. 63
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3.9 Coordinated Sets............................................................................................................... 64
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3.10 Presentation Delay and serialisation of audio data...................................................... 65
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3.11 Announcements ................................................................................................................ 71
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3.12 Remote controls (Commanders) .................................................................................... 73
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Chapter 4. Isochronous Streams .............................................................................................. 75
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4.1 Bluetooth LE Audio topologies ..................................................................................... 75
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4.2 Isochronous Streams and Roles ..................................................................................... 77
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4.3 Connected Isochronous Streams ................................................................................... 80
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4.4 Broadcast Isochronous Streams ..................................................................................... 98
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4.5 ISOAL – The Isochronous Adaptation Layer ........................................................... 122
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Chapter 5. LC3, latency and QoS ........................................................................................... 125
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5.1 Introduction .................................................................................................................... 125
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5.2 Codecs and latency ......................................................................................................... 126
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