ABSTRACT
Coexistence issues in wireless systems are known to be critical.
The wireless channel is a common, i.e., shared media, where an
exclusive assignment can be performed only within the limits of
time, frequency, or code multiplexing. The issues may be especially
unpredictable when license-free frequency bands for industrial,
scientific, and medical applications (ISM-or license-exempt bands)
are used, because cooperation with extrinsic and intrinsic system
influences must be supported. While doing that, the ISM systems
have to observe the overall rules of the regulations for the specific
ISM band.
