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Wireless Telecommunications Bureau Seeks Comment on an Appropriate Method for Determining the Protected Contours
for Grandfathered 3650-3700 MHz Band Licensees https://www.federalregister.gov/articles/2015/11/10/2015-28481/wireless-telecommunications-bureau-seeks-comment-on-an-appropriate-method-for-determining-the In this document, the Wireless Telecommunications Bureau (Bureau) seeks comment on the appropriate methodology for determining the contours for protecting existing
3650-3700 MHz wireless broadband licensees from Citizens Broadband Radio Service users during a fixed transition period. Comments are due on or before December 10, 2015. Reply comments are due on or before December 28, 2015. <>
In the notice, the Bureau seeks comment on the appropriate methodology for determining the protected interference contours for existing 3650-3700 MHz wireless broadband licensees during a fixed transition
period. During the transition period existing licensees will receive protection for operations that are within their “Grandfathered Wireless Protection Zone,” provided that: (1) The stations were registered in the Commission's Universal Licensing System (ULS)
on or before April 17, 2015; and (2) as of a year later (April 17, 2016) the stations are constructed, in service, and fully compliant with the relevant operating rules.
Specifically, the Bureau seeks comment on a two-pronged approach to defining the Grandfathered Wireless Protection Zone around “grandfathered” base stations. Under this two-part approach, the Grandfathered
Wireless Protection Zone around each base station would be defined by: (1) Sectors with a 4.4 km radius from each registered base station, and the azimuth and beamwidth registered for that base station with associated unregistered customer premises equipment
(CPE) to encompass the operational area of unregistered subscriber stations; and (2) sectors (centered on each base station with the registered azimuth and beamwidth) which would encompass all registered subscriber stations within that sector. The first prong
of the approach will provide protection for unregistered subscribers that operate below the mobile power limit of 1 watt/25 MHz EIRP, which are within the range of a registered base station. Since unregistered CPE operates at low power it is only able to effectively
communicate with base stations within a limited range. Considering the relative low power of unregistered CPE compared to the power of a base station, the upstream or “talk-back” path determines the maximum range of a system. Using average values for unregistered
CPE transmit power and base station receiver sensitivity specifications from existing type certified equipment, and assuming free space loss along a line of sight path, we calculate that a typical unregistered CPE will have a maximum range of approximately
4.4 km for “talk-back” to a base station. The second prong of the approach will provide protection to each base station's registered CPE. Protected sectors around each base station will be defined based on the distance from the base station to the furthest
CPE unit registered in ULS and the base station antenna parameters (e.g., azimuth and beamwidth) registered in ULS and a graphic representation of this methodology is included in an appendix to the Notice.
The Bureau proposed that the field strength limit of any Citizens Broadband Radio Service station should be 44dBuV/m/MHz at the boundary of the Grandfathered Wireless Protection Zone. Peter Ecclesine, Technology Analyst 170 W. Tasman Dr, MS SJ-18-3 San Jose, CA 95134-1706 +1-408-527-0815 FAX +1-408-525-9256 ‘without prejudice’ U.C.C. 1-308 If you wish to be removed from this reflector, do not send your request to this reflector - it will have no effect. Instead, go to http://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-REG and then press the LEAVE button. Further information can be found at: http://www.ieee802.org/11/Email_Subscribe.html _______________________________________________________________________________ |