The U.S. Federal Communications Commission (FCC) has proposed new technical rules for unlicensed devices in the 902-928 MHz (915 MHz) band, and possibly for the 2.4 and 5.8 GHz bands, to minimize interference between different types of unlicensed devices, such as automatic meter reading systems, cordless telephones, wireless local area networks and monitoring equipment.
The FCC is proposing to adopt duty cycle limitations on 915 MHz digital devices, many of which operate today at the maximum permissible power levels and on a continuous basis. To provide opportunities for different types of devices to operate in these bands without conflicting, the FCC is proposing a "spectrum etiquette" that would limit the maximum power of a device in relation to its duty cycle. For example, a device that transmits only sporadically would be permitted higher power levels than a device that transmits continuously. Although this proposal is directed primarily at the 915 MHz band, the FCC is also inviting comment on whether similar limits should be adopted for the 2.4 GHz and 5.8 GHz unlicensed bands, which are used by a variety of consumer devices, including those conforming to the Wi-Fi, Bluetooth and ZigBee standards. The FCC is inviting comments through October 15, 2007, and reply comments through November 14, 2007.