In general, in one aspect, the disclosure describes an apparatus that includes a first radio to communicate with a first wireless network and a second radio to communicate with a second wireless network. A controller is used to estimate signal to noise and interference ratio (SINR) for signal being received by the first radio when the second radio is transmitting. The controller is also to determine if the estimate meets a threshold. Transmissions are permitted from the second radio while the first radio is receiving if the threshold is met.