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lotter on DSK11XQN23PROD with PROPOSALS1

Federal Register / Vol. 86, No. 158 / Thursday, August 19, 2021 / Proposed Rules IEEE 802.11 working groups with ongoing activities to define the channel access protocols to enable the same 60
GHz system transmitting communication signals to transmit radar signals.
The ongoing interest in expanding the scope of permissible unlicensed operations in the 60 GHz band has prompted interested parties to form a 60
GHz Coexistence Study Group that has been looking into ways to accommodate both unlicensed communications device and FDS operations in the band. This group, which has attracted the active participation of many key members of the industry and meets on a regular basis, operates independently of the Commission. Members of this group, however, have submitted comments and ex parte filings in conjunction with many of the recent waiver proceedings.
In general, these submissions have documented the parties interest in 60
GHz unlicensed operations and have encouraged us to initiate a rulemaking proceeding to review 15.255 of the Commissions rules with a goal of putting into place a new framework to promote further innovation in the 60
GHz band by both unlicensed communications and FDS operations.
Finally, the 2020 panel of the FCCs Technological Advisory Council TAC
took notice of the 60 GHz Coexistence Study Group when its Future of Unlicensed Operations working group examined ways to improve regulations for the 60 GHz band. As part of the TACs January 14, 2021 meeting, the working group recommended that the Commission initiate a rulemaking proceeding to examine the 60 GHz rules in 15.255 to address issues raised by the numerous waiver requests that had been filed.
Discussion. The Commission believes that there are significant benefits in initiating this rulemaking proceeding, and the Commission agrees with the TAC and other parties that have urged us to comprehensively evaluate unlicensed operations under 15.255 of the Commissions rules. The Commission realizes that past individual waivers have served as an important relief valve that allow for unique types of operations that have important public interest benefits and that do not result in harmful interference to incumbent licensed users or jeopardize coexistence with other unlicensed users but do not comply with the Commissions rules. However, they are an inappropriate mechanism for providing the type of broad-based relief that the Commission considers here. Together, the overwhelming interest in FDS operations in the 60 GHz
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band, the breadth of deployments that parties have identified, and the opportunities for innovation that will be made possible by the availability of relatively inexpensive applicationagnostic FDS-capable chipsets make the Commissions initiation of a rulemaking proceeding both timely and appropriate.
In recognition that unencumbered unlicensed operation has proven to be an especially powerful engine for innovation and economic growth, the Commissions proposals are designed to expand the opportunities for unlicensed FDS operations in the band to the greatest extent possible. At the same time, the Commissions proposals are also designed to provide assurance that the unlicensed communications devices that have been permitted to use the band since it was first made available for unlicensed operations will be able to coexist with these new unlicensed operations. And, in all cases, the Commissions proposals remain true to the bedrock principle that unlicensed devices, regardless of type, must not cause harmful interference to authorized users of the band.
In this NPRM, the Commission proposes targeted changes to 15.255 of the Commissions rules to expand unlicensed FDS device operations in the 60 GHz band. First, the Commission proposes that all FDS devices that limit their operating frequencies to the 5764
GHz portion of the band would be permitted to transmit at a maximum of 20 dBm average EIRP, 13 dBm/MHz average EIRP power spectral density, and 10 dBm transmitter conducted output power, along with a maximum 10% duty cycle restriction within any 33 ms interval. FDS devices will be able to continue to operate across the entire 5771 GHz band at the 10 dBm EIRP
and 10 dBm conducted output power limits specified in the Commissions existing rules. By streamlining the Commissions rules in this manner, the Commission would no longer need the special provisions for short-range interactive motion-sensing mobile radars i.e. SRIMS that are contained in the Commissions existing rules.
Second, the Commission also proposes to retain and potentially to expand on the provision of 15.255c2 allowing fixed FDS devices that contain their operating bandwidth to the 61.061.5
GHz band to transmit at 40 dBm average EIRP and 43 dBm peak EIRP. Finally, the Commission seeks comment on methods to enhance coexistence e.g., listen-before-talk or other spectrum sensing/contention avoidance capabilities that could be used to allow the same power level for FDS devices as
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is currently permitted for 60 GHz communication devices up to 40 dBm EIRP across the entire 5771 GHz band.
The Commission is not proposing any rule revisions for existing unlicensed communication devices such as WiGig WLAN or fixed point-to-point wireless links that currently operate in the 57
71 GHz band. However, the Commission seek comment on whether there are particular provisions that the Commission is proposing for FDS
operation, such as an antenna gain limit instead of a conducted power limit and requiring use of a spectrum sensing mechanism, that should be more broadly applied to all Part 15 devices operating in the 5771 GHz band.
The Commission notes that the TACs Future of Unlicensed Operations working group suggested the Commission seek comment on whether the rules should allow greater radiated power for radar applications, if the parameters of the Google Soli waiver should be incorporated into the rules, and whether there are changes to the conditions and technical requirements set forth in the recent waivers that would improve sharing with communications applications. It further suggested that the Commission ask whether the use of a contention-based protocol should be required, and whether 60 GHz band unlicensed radar applications should be allowed to use the same power levels as communications applications in the band if they incorporate listen-beforetalk procedures. The Commission invites commenters to address these specific questions.
As an initial matter, given that the Commission refers to both FDS and radars extensively throughout this document, the Commission addresses the relationship between the two terms.
Field disturbance sensors broadly include radar operations. Although 15.3l of the Commissions rules provides a definition for field disturbance sensor, it does not provide a definition for radar, and instead parties must look to the radar definition contained in 2.1 of the Commissions rules. The Commission seeks comment on whether the rules related to field disturbance sensors in 15.255 are sufficiently broad and flexible to accommodate the classes of devices that parties anticipate will be developed to operate in the 5771 GHz band. The Commission also seeks comment on whether the Commission should modify the definitions contained in Part 15 of the Commissions rules to provide greater clarity about the relationship between FDS and radars and, if so, how?
Commenters that support modifying the
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