The combinations and expected behavior when Wi-Fi® is operating in the 2.4 GHz band in the connected state depend on the transmit (TX) and receive (RX) status of the Wi-Fi and Bluetooth® LE/IEEE 802.15.4 devices.
The following table describes the coexistence behavior for the different RX/TX combinations when Wi-Fi is operated in the 2.4 GHz band in the connected state.
| Wi-Fi (2.4 GHz) | Bluetooth LE/IEEE 802.15.4 (2.4 GHz) | Coexistence behavior | |
|---|---|---|---|
| Shared antenna | Separate antennas | ||
| RX | RX | Single | Concurrent |
| TX | RX | Single | Single or concurrent1 |
| RX | TX | Single | Single or concurrent1 |
| TX | TX | Single | Single2 |
1Depending on signal strength some TX/RX related performance effects can occur.
2Concurrent TX/TX is currently not supported.
When both interfaces are operating concurrently (TX/RX or RX/TX), depending on relative signal strengths, there can be some TX/RX related performance effects. For example, receiving short range signals close to the sensitivity limit while Wi-Fi is transmitting results in the 2.4 GHz noise floor being elevated and hence short-range demodulation being degraded.
Concurrent TX/TX is not supported for separate antennas because the coexistence logic assumes that both Bluetooth LE/IEEE 802.15.4 and Wi-Fi signals are overlapping in frequency. This is a worst case scenario as the channel information is not currently shared from the Bluetooth LE/IEEE 802.15.4 interface to the coexistence logic.