U-NII

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The Unlicensed National Information Infrastructure (U-NII)[1][2] radio band is part of the radio frequency spectrum used by IEEE-802.11a devices and by many wireless ISPs. It operates over four ranges:

  • U-NII Low (U-NII-1[3]): 5.150-5.250 GHz. Originally limited to indoor use only. Regulations required use of an integrated antenna, with power limited to 50 mW.[4] Rules changed in 2014 to permit outdoor operation, maximum fixed power 1 watt, maximum fixed EIRP 4 watts (+36 dBm) point-to-multipoint, 200 watts (+53 dBm) point-to-point. [1] However, strict out-of-band emission rules limit practical point-to-point power to lower levels.
  • U-NII Mid (U-NII-2A[3]): 5.250-5.350 GHz. Both outdoor and indoor use, subject to Dynamic Frequency Selection (DFS, or radar avoidance). Regulations allow for a user-installable antenna.[5] Power limited to 250 mW[4]
  • U-NII-2B: 5.350-5.470 GHz. Currently 120MHz of spectrum not allocated by the FCC for unlicensed use.
  • U-NII Worldwide (U-NII-2C / U-NII-2e): 5.470-5.725 GHz. Both outdoor and indoor use, subject to Dynamic Frequency Selection (DFS, or radar avoidance).[5] Power limited to 250 mW.[4] This spectrum was added by the FCC in 2003 to "align the frequency bands used by U-NII devices in the United States with bands in other parts of the world".[5] The FCC currently has an interim limitation on operations on channels which overlap the 5600 - 5650 MHz band.[6]
  • U-NII Upper (U-NII-3[7]): 5.725 to 5.850 GHz. Sometimes referred to as U-NII / ISM due to overlap with the ISM band. Regulations allow for a user-installable antenna. Power limited to 1W[4]
  • DSRC/ITS (U-NII-4[8]): 5.850 to 5.925 GHz. At present U-NII-4 spectrum is being considered by the FCC for unlicensed use. U-NII-4 is presently only usable for Dedicated Short Range Communications Service (DSRC) and licensed Amateur Radio Operators.
Band Freq. Range Bandwidth Max Power Max EIRP
U-NII Low / U-NII-1 / U-NII Indoor 5.150–5.250 GHz 100 MHz 50 mW 200 W
U-NII Mid / U-NII-2A 5.250–5.350 GHz 100 MHz 250 mW 1 W
U-NII-2B 5.350–5.470 GHz 120 MHz . .
U-NII Worldwide / U-NII-2C / U-NII-2-Extended / U-NII-2e 5.470–5.725 GHz 255 MHz . .
U-NII Upper / U-NII-3 5.725–5.825 GHz 100 MHz 1 W 200 W
DSRC/ITS / U-NII-4 5.850–5.925 GHz   75 MHz . .

Wireless ISPs generally use 5.725-5.825 GHz.
In the USA licensed amateur radio operators are authorized 5.650-5.925 GHz by Part 97.303 of the FCC rules.

U-NII is an FCC regulatory domain for 5- GHz wireless devices. U-NII power limits are defined by the United States CFR Title 47 (Telecommunication), Part 15 - Radio Frequency Devices, Subpart E - Unlicensed National Information Infrastructure Devices, Paragraph 15.407 - General technical requirements. Regulatory use in individual countries may differ.

The European HiperLAN standard operates in same frequency band as the U-NII.

5 GHz (802.11a/h/j/n)[edit]

Except where noted, all information taken from Annex J of IEEE 802.11-2007 modified by amendments k, y and n. Because countries set their own regulations regarding specific uses and maximum power levels within these frequency ranges, it is recommended that local authorities are consulted as regulations may change at any time.

In 2007, the FCC began requiring that devices operating in channels 52, 56, 60 and 64 must have Dynamic Frequency Selection (DFS) capabilities. This is to avoid communicating in the same frequency range as some radar. In 2014, the FCC issued new rules[9] for all devices due to interference with government weather radar systems. Fines and equipment seizure were listed as punishment for non-compliance.

Band channel frequency
(MHz)
United States Europe Japan Singapore China Israel Korea Turkey
40/20 MHz[10] 40/20 MHz 40/20 MHz[11] 10 MHz 20 MHz 20 MHz 20 MHz[12] 20 MHz[13] 20 MHz
183 4915 No No No Yes No No No No No
184 4920 No No Yes Yes No No No No No
185 4925 No No No Yes No No No No No
187 4935 No No No Yes No No No No No
188 4940 No No Yes Yes No No No No No
189 4945 No No No Yes No No No No No
192 4960 No No Yes No No No No No No
196 4980 No No Yes No No No No No No
7 5035 No No No Yes No No No No No
8 5040 No No No Yes No No No No No
9 5045 No No No Yes No No No No No
11 5055 No No No Yes No No No No No
12 5060 No No No No No No No No No
16 5080 No No No No No No No No No
U-NII-1 34 5170 No No No No No No Yes Yes Yes
36 5180 Yes Yes Yes No Yes No Yes Yes Yes
38 5190 No No No No No No Yes Yes Yes
40 5200 Yes Yes Yes No Yes No Yes Yes Yes
42 5210 No No No No No No Yes Yes Yes
44 5220 Yes Yes Yes No Yes No Yes Yes Yes
46 5230 No No No No No No Yes Yes Yes
48 5240 Yes Yes Yes No No No Yes Yes Yes
U-NII-2A 52 5260 Yes Yes Yes No No No Yes Yes Yes
56 5280 Yes Yes Yes No No No Yes Yes Yes
60 5300 Yes Yes Yes No No No Yes Yes Yes
64 5320 Yes Yes Yes No No No Yes Yes Yes
U-NII-2B . 5350–5470 No unknown
U-NII-2C 100 5500 Yes[14] Yes Yes No No No No Yes No
104 5520 Yes[14] Yes Yes No No No No Yes No
108 5540 Yes[14] Yes Yes No No No No Yes No
112 5560 Yes[14] Yes Yes No No No No Yes No
116 5580 Yes[14] Yes Yes No No No No Yes No
120 5600 No[15] Yes Yes No No No No Yes No
124 5620 No Yes Yes No No No No Yes No
128 5640 No Yes Yes No No No No Yes No
132 5660 Yes[14] Yes Yes No No No No No No
136 5680 Yes[14] Yes Yes No No No No No No
140 5700 Yes[14] Yes Yes No No No No No No
U-NII-3 149 5745 Yes No No No Yes Yes No Yes Yes
153 5765 Yes No No No Yes Yes No Yes Yes
157 5785 Yes No No No Yes Yes No Yes Yes
161 5805 Yes No No No Yes Yes No Yes Yes
165 5825 Yes No No No Yes Yes No Yes Yes
U-NII-4[16] 169 5845 No unknown
173 5865 No unknown
177 5885 No unknown
181 5905 No unknown
185 5925
(proposed expansion)
No unknown

See also[edit]

References[edit]

External links[edit]