ISM band

(redirected from Unlicensed band)
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ISM band

(Industrial, Scientific and Medical band) A part of the radio spectrum that can be used for any purpose without a license in most countries. In the U.S., the 902-928 MHz, 2.4 GHz and 5.7-5.8 GHz bands were initially used for machines that emitted radio frequencies, such as RF welders, industrial heaters and microwave ovens, but not for radio communications.

In 1985, the FCC Rules (Part 15.247) opened up the ISM bands for wireless LANs and mobile communications. In 1997, it added additional bands in the 5 GHz range under Part 15.407, known as the Unlicensed National Information Infrastructure (U-NII). Europe's HIPERLAN wireless LANs use the same 5 GHz bands, which are titled the "Broadband Radio Access Network."

Numerous applications use the ISM/U-NII bands, including cordless phones, wireless garage door openers, wireless microphones, vehicle tracking and amateur radio. See U-NII.
                      Power LimitISM Bands               (Watts)902 - 928 MHz
   Cordless phones          1 W
   Microwave ovens        750 W
   Industrial heaters     100 kW
   Military radar        1000 kW

   2.4 - 2.4835 GHz
   Bluetooth              100 mW
   Wi-Fi - 802.11b/g        1 W
   Microwave ovens        900 W

   5 GHz
   5.725 - 5.825 GHz        4 W
   Wi-Fi - 802.11a/n/ac


   U-NII 5 GHz Bands
   Wi-Fi - 802.11a/n

   5.15 - 5.25 GHz        200 mW
   5.25 - 5.35 GHz          1 W
   5.47 - 5.725 GHz         1 W
   5.725 - 5.825 GHz        4 W


   60 GHz Band
   57 - 64 GHz (see  WirelessHD and  WiGig)
References in periodicals archive ?
Leith, "Coexistence of WiFi and LTE in unlicensed bands: a proportional fair allocation scheme," in Proceedings of the IEEE International Conference on Communication Workshop (ICCW '15), pp.
Zong, "On the throughput analysis of LTE and WiFi in unlicensed band," in Proceedings of the 48th Asilomar Conference on Signals, Systems and Computers (ACSSC '15), pp.
In this paper, we address the traffic offloading issue in two-tier multi-mode small cell networks over unlicensed bands. Each small cell base station (SBS) transfers part of traffic load to the sharing band may affect the capacity performance of the neighbors who access the unlicensed band at the same time.
Unlicensed bands, which involve coexistence where no device has greater interference protection than any other, are an option where there is no incumbent service.
Up to now, Wi-Fi's reliability within the unlicensed band has kept cable operators away from the technology.
Yet another force that might have an effect on the diffusion of flexible spectrum usage is the surplus of existing licensed and unlicensed bands. For example the 5 GHz unlicensed band is still largely unutilized and the digital dividend that is released by the switch in broadcasting technologies from analogue to digital will further cater to the needs.
Powell: The commission made an interesting error many years ago and issued the unlicensed band because they thought the spectrum was junk.
The 2.4 gigahertz unlicensed band includes the Wi-Fi devices, point-to-point microwave, cordless phones, and the Bluetooth applications.
Telematix's technology makes it possible to use unlicensed band wireless technology to simultaneously deliver voice, video and data to multiple clients within a single network.
The assumption is that at the time of construction of a network in the unlicensed band sufficient fibre infrastructure will be available for backhaul usage; therefore there is no need for any wireless backhauls.
Applications with the 7.5 GHz frequency extension include aviation signals, directional radio, VSAT and signals in the 5 GHz unlicensed band such as wireless LAN (WLAN) and WiMAX.