AN1017: Zigbee® and Thread Coexistence with Wi-Fi
●This application note describes the impact of Wi-Fi on Zigbee and
Thread and methods to improve coexistence with Wi-Fi. First, design considerations to improve coexistence without direct interaction between Zigbee/Thread and Wi-Fi radios are described.
These techniques are applicable both to the EM35x/EM358x and Mighty Gecko family (EFR32MGx). Next, Silicon Lab’s Packet Traffic Arbitration (PTA) support to coordinate 2.4GHz RF traffic for co-located Zigbee/Thread and Wi-Fi radios is described. This PTA feature set is available for the EFR32MGx family.
Additional details about the implementation of managed coexistence are available in an expanded version of this application note, AN1017-NDA: ZigBee and Thread Coexistence with Wi-Fi, available under non-disclosure from Silicon Labs technical support.
●KEY POINTS
■Wi-Fi Impact on Zigbee/Thread
■Improving unmanaged coexistence
■Implementing managed coexistence
●The 2.4GHz 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 SNR, high throughput requirements for file transfers and/or video streaming may result in high Wi-Fi duty cycle within 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 Zigbee and Thread and methods to improve coexistence with Wi-Fi on two Silicon Labs integrated circuits, the EM35x/EM358x and the Mighty Gecko family (EFR32MGx).
■The section Unmanaged Coexistence describes design considerations to improve coexistence without direct interaction between Zigbee/Thread and Wi-Fi radios.
■The section Managed Coexistence describes Silicon Lab’s PTA (Packet Traffic Arbitration) support to coordinate 2.4GHz RF traffic for co-located Zigbee/Thread and Wi-Fi radios. PTA support is available for the EFR32MGx only.
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Application note & Design Guide |
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Please see the document for details |
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QFN48;QFN32 |
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English Chinese Chinese and English Japanese |
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2018/03/03 |
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Rev. 1.2 |
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AN1017 |
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2.4 MB |
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