[Federal Register Volume 79, Number 185 (Wednesday, September 24, 2014)]
[Rules and Regulations]
[Page 56988]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2014-22677]


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FEDERAL COMMUNICATIONS COMMISSION

47 CFR Part 15

[ET Docket No. 13-49; FCC 14-30]


Unlicensed National Information Infrastructure (U-NII) Devices in 
the 5 GHz Band

AGENCY: Federal Communications Commission.

ACTION: Correcting amendments.

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SUMMARY: On May 1, 2014, the Commission released a Report and Order, 
``Unlicensed National Information Infrastructure (U-NII) Devices in the 
5 GHz Band.'' This document contains corrections to the final 
regulations that appeared in the Federal Register on May 1, 2014 (79 FR 
24569).

DATES: Effective September 24, 2014.

FOR FURTHER INFORMATION CONTACT: Aole Wilkins, Office of Engineering 
and Technology, (202) 418-2406 or email [email protected].

SUPPLEMENTARY INFORMATION:

Background

    The final regulations that are the subject of this correction 
relates to ``Unlicensed National Information Infrastructure (U-NII) 
Devices in the 5 GHz Band'' under Sec.  15.407(a)(2) and (h)(2) of the 
rules.

Need for Correction

    As published, the amendatory instructions in the final regulations 
contain errors that are misleading and need immediate correction.

List of Subjects in 47 CFR Part 15

    Communications equipment, Radio.

    Accordingly, 47 CFR part 15 is corrected by making the following 
correcting amendments:

PART 15--RADIO FREQUENCY DEVICES

0
1. The authority citation for part 15 continues to read as follows:

    Authority:  47 U.S.C. 154, 302a, 303, 304, 307, 336, 544a, and 
549.


0
2. Section 15.407 is amended by revising the first sentence of 
paragraph (a)(2) and by revising paragraph (h)(2) to read as follows:


Sec.  15.407  General technical requirements.

    (a) * * *
    (2) For the 5.25-5.35 GHz and 5.47-5.725 GHz bands, the maximum 
conducted output power over the frequency bands of operation shall not 
exceed the lesser of 250 mW or 11 dBm + 10 log B, where B is the 26 dB 
emission bandwidth in megahertz. * * *
* * * * *
    (h) * * *
    (2) Radar Detection Function of Dynamic Frequency Selection (DFS). 
U-NII devices operating with any part of its 26 dB emission bandwidth 
in the 5.25-5.35 GHz and 5.47-5.725 GHz bands shall employ a DFS radar 
detection mechanism to detect the presence of radar systems and to 
avoid co-channel operation with radar systems. Operators shall only use 
equipment with a DFS mechanism that is turned on when operating in 
these bands. The device must sense for radar signals at 100 percent of 
its emission bandwidth. The minimum DFS detection threshold for devices 
with a maximum e.i.r.p. of 200 mW to 1 W is -64 dBm. For devices that 
operate with less than 200 mW e.i.r.p. and a power spectral density of 
less than 10 dBm in a 1 MHz band, the minimum detection threshold is -
62 dBm. The detection threshold is the received power averaged over 1 
microsecond referenced to a 0 dBi antenna. For the initial channel 
setting, the manufacturers shall be permitted to provide for either 
random channel selection or manual channel selection.
    (i) Operational Modes. The DFS requirement applies to the following 
operational modes:
    (A) The requirement for channel availability check time applies in 
the master operational mode.
    (B) The requirement for channel move time applies in both the 
master and slave operational modes.
    (ii) Channel Availability Check Time. A U-NII device shall check if 
there is a radar system already operating on the channel before it can 
initiate a transmission on a channel and when it has to move to a new 
channel. The U-NII device may start using the channel if no radar 
signal with a power level greater than the interference threshold 
values listed in paragraph (h)(2) of this section, is detected within 
60 seconds.
    (iii) Channel Move Time. After a radar's presence is detected, all 
transmissions shall cease on the operating channel within 10 seconds. 
Transmissions during this period shall consist of normal traffic for a 
maximum of 200 ms after detection of the radar signal. In addition, 
intermittent management and control signals can be sent during the 
remaining time to facilitate vacating the operating channel.
    (iv) Non-occupancy Period. A channel that has been flagged as 
containing a radar system, either by a channel availability check or 
in-service monitoring, is subject to a non-occupancy period of at least 
30 minutes. The non-occupancy period starts at the time when the radar 
system is detected.
* * * * *

Federal Communications Commission.
Marlene H. Dortch,
Secretary, Office of the Secretary, Office of Managing Director.
[FR Doc. 2014-22677 Filed 9-23-14; 8:45 am]
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