AN1128: Bluetooth® Coexistence with Wi-Fi
This application note describes the Wi-Fi impact on Bluetooth®and methods to improve Bluetooth coexistence with Wi-Fi. It first describes design considerations to improve coexistence without direct interaction between Bluetooth and Wi-Fi radios. These techniques are applicable to the Mighty Gecko (EFR32MGx series) and Blue Gecko (EFR32BGx series). Next, this application note discusses the Silicon Labs Packet Traffic Arbitration (PTA) support to coordinate 2.4GHz RF traffic for co-located Bluetooth and Wi-Fi radios. This PTA feature set is available for the EFR32MGx series and EFR32BGx series.
Additional details about the implementation of managed coexistence are available in an expanded version of this application note, AN1128-NDA: Bluetooth® Coexistence with Wi-Fi, available under non-disclosure from Silicon Labs technical support.
KEY POINTS:
• Wi-Fi impact on Bluetooth
• Improving unmanaged coexistence
• Implementing managed coexistence
The 2.4GHz Industrial, Scientific and Medical (ISM) band supports Wi-Fi (IEEE 802.11b/g/n), Zigbee®/Thread (IEEE 802.15.4), Bluetooth, and Bluetooth Low Energy. The simultaneous and co-located operation of these different 2.4GHz radio standards can degrade performance of one or more of the radios. To improve interference robustness, each of the 2.4GHz ISM radio standards support some level of collision avoidance and/or message retry capability. At low data throughput rates, low power levels, and/or sufficient physical separation, these 2.4GHz ISM standards can co-exist without significant performance impacts. However, recent customer trends are making coexistence more difficult:
•Increased Wi-Fi transmit power level for “extended range”+30dBm Wi-Fi Access Points are now common.
•Increased Wi-Fi throughput. Depending on achievable Signal-to-Noise Ratio (SNR), high throughput requirements for file transfers and/or video streaming may result in high Wi-Fi duty cycle within the 2.4GHz ISM band.
•Integrating Wi-Fi, Zigbee, Thread, and Bluetooth Low Energy into the same device for gateway functionality
This is required by Home Automation and Security applications, and provides easier end-node commissioning using Bluetooth Low Energy. This application note describes the impact of Wi-Fi on Bluetooth Low Energy and methods to improve Bluetooth Low Energy coexistence with Wi-Fi on two Silicon Labs integrated circuit series, the Mighty Gecko (EFR32MGx) and the Blue Gecko (EFR32BGx).
•Section 3, Unmanaged Coexistence describes design considerations to improve coexistence without direct interaction between Blue-tooth and Wi-Fi radios.
•Section 4, Managed Coexistence describes the Silicon Labs Packet Traffic Arbitration (PTA) support to coordinate 2.4GHz RF traffic for co-located Bluetooth and Wi-Fi radios.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2019/01/19 |
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Rev. 1.0 |
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AN1128 |
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1.8 MB |
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