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Spectrum Management

Protecting a Vital, Limited Resource

Overview

Many Federal agencies use radio frequency spectrum to perform vital operations. NTIA manages the Federal government's use of spectrum, ensuring that America's domestic and international spectrum needs are met while making efficient use of this limited resource. NTIA carries out this responsibility with assistance and advice from the Interdepartment Radio Advisory Committee and by:

  • establishing and issuing policy regarding allocations and regulations governing the Federal spectrum use;
  • developing plans for the peacetime and wartime use of the spectrum;
  • preparing for, participating in, and implementing the results of international radio conferences;
  • assigning frequencies;
  • maintaining spectrum use databases;
  • reviewing Federal agencies' new telecommunications systems and certifying that spectrum will be available;
  • providing the technical engineering expertise needed to perform specific spectrum resources assessments and automated computer capabilities needed to carry out these investigations;
  • participating in all aspects of the Federal government's communications related emergency readiness activities; and
  • participating in Federal government telecommunications and automated information systems security activities.

Related content

President’s FY21 Budget Boosts Spending for Spectrum Management, 5G Security

February 10, 2020

America’s technology leadership in secure and reliable 5G communications is critical to the nation’s economic and international competitiveness. Delivering on these goals, President Trump’s Fiscal Year 2021 budget calls for increased funding to modernize the nation’s spectrum management system; improve the security of our telecommunications infrastructure; and upgrade advanced communications research.

The budget would spend an additional $25 million to modernize the spectrum management system to accommodate advanced technologies. With these resources, NTIA will create a secure, flexible, and automated spectrum management system that would improve with the integrity and confidentiality of data; reduce “white space” between spectrum assignments; reengineer business processes; and automate workflows.

The budget also would add $3 million to for the Advanced Communications Research program at the Institute for Telecommunication Sciences, NTIA’s research lab in Boulder, Colorado. The funds would be used to replace equipment the lab uses for research and testing of 5G technologies to help the United States transition from 4G LTE. To improve NTIA’s ability to manage supply chain risks to our nation’s telecommunications infrastructure, the budget calls for an additional $2.1 million and six new positions.

Overall, the President’s FY2021 budget request for NTIA is $72.2 million.

Topics
Spectrum Management

Emission Spectrum Measurements of a 3.5 GHz LTE Hotspot

Report ID
Technical Report TR-15-512
February 02, 2015
Geoffrey A. Sanders; John E. Carroll; Frank H. Sanders; Robert L. Sole; Robert J. Achatz
Abstract

In response to proposals to introduce new Long Term Evolution (LTE) radio systems into the 3550–3650 MHz (called 3.5 GHz) portion of radio spectrum in the United States, a joint team of National Telecommunications and Information Administration (NTIA) and U.S. Navy electronics engineers performed emission spectrum measurements on a 3.5 GHz (LTE Band 42) wireless access point (WAP), or hotspot. The hotspot was packaged for indoor use but similar systems could be deployed outdoors. The authors measured the hotspot emission spectrum with 110 dB of dynamic range across 1.5 GHz of spectrum (from 2.7 to 4.2 GHz). Other data outputs include: spectra measured with the device tuned to its lowest, highest, and middle available operational frequencies; comparative peak-to-average spectra; and spectra measured when the hotspot was operated with 10, 15, and 50 resource blocks. The emission spectrum is plotted against proposed in band, out-of-band (OOB) and spurious emission limits; the spectrum meets those limits by at least 10 dB at all points. The results presented here may be used in electromagnetic compatibility analyses for future 3.5 GHz spectrum sharing between LTE-based transmitters and incumbent systems such as radar receivers.

Keywords: radar; electromagnetic compatibility (EMC); band sharing; spectrum sharing; out-of-band (OOB) emissions; spectrum measurement; Long Term Evolution (LTE); 3.5 GHz band; LTE band 42; emission limits; resource blocks; spurious emissions; wireless access point (WAP); wireless local area network (WLAN)

A Spectrum Sharing Case Study Leading to the Development of a Method for Identifying Interference Potential

Report ID
Technical Report TR-15-516
April 02, 2015
Christopher J. Behm; Nicholas DeMinco; Timothy J. Riley; Linh P. Vu
Abstract

This report details a method that was developed to identify all potential forms of interference that could occur with a proposed collocation of three Federal systems in the 1675–1695 MHz frequency band. The incumbents are the National Oceanographic and Atmospheric Administration’s (NOAA) Geostationary Operational Environmental Satellites (GOES) and receivers and radiosonde systems. The entrant is the Department of Homeland Security’s (DHS) Video Surveillance System (VSS). The primary objective is that the quality of the mission-critical communications for each service is maintained.

A detailed electromagnetic compatibility (EMC) analysis is used to identify both the highest potential interference scenarios and those scenarios that have little to no effect. Two primary interference mitigation techniques can be implemented to achieve electromagnetic compatibility: frequency offset (Δf) and separation distance. Based on the frequency dependent rejection (FDR) between the interference source and the victim receiver, the Δf and separation distance necessary for a desired level of interference rejection can be calculated. For all potential interference interactions, the Δf and the separation distance can be adjusted to arrive at a solution for operation on a non-interference basis. It is not the intent of this report to make pronouncements on how to achieve coexistence within a shared band. The intent is to examine and illuminate the engineering questions that need to be answered so that those who are responsible for Federal services in a band may negotiate and cooperate with their colleagues who are responsible for other Federal services in the same band.

Keywords: electromagnetic compatibility (EMC); spectrum sharing; interference mitigation; frequency dependent rejection; frequency offset; separation distance

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