A method and apparatus of reducing interference between subsystems implementing wireless communication protocols is disclosed. The method comprises reducing interference in a first subsystem implementing a first wireless communication protocol operating in a first frequency band caused by a second subsystem implementing a second wireless communication protocol operating in a second frequency band, the second wireless communication protocol employing Adaptive Frequency Hopping (AFH), the method comprising calculating one or more frequencies to be avoided by the second subsystem on the basis of one or more frequencies in use by the first subsystem.