•The radio frequency (RF) spectrum is a scarce and shared resource, used nationally and internationally, and subject to a wide range of regulatory oversight. The International Telecommunication Union (ITU) is a specialized agency of the United Nations which plays the same role internationally.
Most of the countries allow usage of 866MHZ and 2.4 GHZ bandwidth with the regulated transmitting power freely.
Regulatory differences are based on following points:
•Usage of channel
–Primary service
–Secondary service
•Cannot interfere with primary service
•Cannot claim protection of interference from primary service
•Can claim protection of interference from other secondary users
–Industrial, Scientific, & Medical (ISM) Bands
•Narrowband or Spread Spectrum
•Power level
•Duty cycle
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