Upcoming Event

Implications of Proposed 5G Service in 24 GHz Bands for Remote Sensing of Atmospheric Water Vapor: A Workshop

July 10, 2019 - July 11, 2019
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Location: National Academy of Sciences Building
2101 Constitution Ave NW Washington DC 20418

The National Academies of Sciences, Engineering, and Medicine is organizing a fast-track workshop on the Implications of Proposed 5G Service in 24 GHz Bands for Remote Sensing of Atmospheric Water Vapor to be held on July 10-11, 2019 in Washington, DC. This is a cooperative effort among the Board on Atmospheric Sciences and Climate (BASC), the Committee on Radio Frequency (CORF), and the Computer Science and Telecommunications Board (CSTB). The workshop will explore the impacts of proposed 5G service in the 24 GHz band on remote sensing of atmospheric water vapor in the 23.6-24.0 GHz band. It will bring together experts in meteorology, remote sensing, and telecommunications from public, private, and academic sectors to inform U.S. decision makers about allocating the 24 GHz band and to provide input to the November 2019 World Radiocommunication Conference.

Topics to be discussed at the workshop include:

  • The susceptibility to interference of the systems currently used for passive remote sensing of water vapor, the impacts of different levels of interference on weather forecasting and atmospheric science, and the adequacy and appropriateness of noise floors proposed by the FCC (-20 dB W/200 MHz) and NASA/NOAA (-50dB W/200MHz);
  • Design and operational factors that define the level of noise in the 23.6-24.0 GHz band from 24 GHz band 5G cellular service;
  • The appropriateness of existing ITU standards for 5G spectrum allocation in light of such technical developments as massive multiple-input and multiple-output (MIMO) transmitter/receiver designs and small cell and geographically restricted deployment architectures;
  • The tradeoffs between cost-effective 5G deployment and adequate protection of remote sensing in terms of the guard band size, additional technology, and/or operational constraints needed to reduce out-of-band emissions;
  • Additional analysis and/or measurement, if any, that are needed to determine the acceptable noise floor or acceptable 5G operational parameters;
  • The implications for weather forecasting based on the proposed noise floor, and the use of multiple (23.8, 31.4, etc.) measurement bands to extract atmospheric water vapor data; and
  • Other related issues deemed important by the workshop planning committee.

A brief proceedings of the presentations and discussions at the workshop will be prepared by a designated rapporteur in accordance with institutional guidelines.