From the Document: "On April 20, 2020, the Federal Communications Commission (FCC) unanimously approved an application by Ligado Networks LLC (Ligado) to 'deploy a low-power [9.8 decibel watts (dBW)] terrestrial nationwide network in the 1526-1536 MHz, 1627.5-1637.5 MHz, and 1646.5-1656.5 MHz bands [of the electromagnetic spectrum] that will primarily support Internet of Things (IoT) services.' These frequency bands are traditionally used for satellite operations. The Department of Defense (DOD) opposed this decision--along with the Department of Homeland Security, Department of Transportation (DOT), Department of Interior, Department of Justice, the Federal Aviation Administration (FAA), and others. That opposition related to concerns that Ligado's proposed network could interfere with signals from satellites to Global Positioning System (GPS) receivers. Congress may consider federal agency concerns, including DOD concerns related to mission-critical systems and the FCC's response, as it conducts oversight of the FCC's ruling. Congress may also consider broader issues related to fifth generation (5G) mobile technologies, such as the allocation of spectrum among competing users and the impact of spectrum decisions on national security."
CRS Insight, IN11400
Congressional Research Service: https://crsreports.congress.gov/