--- schema_version: '1.0' id: government-20260731-80c6c2 content_kind: government-document url: https://www.federalregister.gov/documents/2026/07/31/2026-15598/upper-c-band-398-42-ghz-expanding-flexible-use-of-the-37-to-42-ghz-band url_hash: 80c6c2aca43607b8537e5eae91287bddc5e1f75b37b9c29798cc2dd8fbfe1822 canonical_url: https://www.federalregister.gov/documents/2026/07/31/2026-15598/upper-c-band-398-42-ghz-expanding-flexible-use-of-the-37-to-42-ghz-band source: us-federal-register category: government/us category_raw: Rule country: us region: us tags: - Administrative practice and procedure - Communications - Communications common carriers - Radio - Reporting and recordkeeping requirements - Satellites - Telecommunications lang: en published_at: '2026-07-31T00:00:00Z' fetched_at: '2026-07-31T15:01:41.585612Z' updated_at: '2026-07-31T15:09:29Z' status: published content_hash: dd8841dc8cd51c9b34a326f3f14915b0faa600f87940a3b8536661483565ec0c content_changed_at: null license_note: full license_basis: public-domain-17usc105 body_available: false attribution: 'Source: Office of the Federal Register, National Archives and Records Administration' license_rule: source:us-federal-register summary: In this document, the Federal Communications Commission (Commission) adopted a Report and Order, Order of Proposed Modification, and Order on Reconsideration (Order), that expands the ecosystem for next-generation wireless services in the 3.7-4.2 GHz band (C-band) by making 160 megahertz of the 3.98-4.2 GHz band (Upper C- band) available for terrestrial wireless flexible use. This action is pursuant to Congress' direction in the One Big Beautiful Bill Act to complete a system of competitive bidding by July 4, 2027, for at least 100 megahertz of spectrum in the 3.98-4.2 GHz band. The Order creates a single 3.7 GHz Service that spans 3.7-4.14 GHz and adopts competitive bidding procedures for an auction. The Order largely applies the current Lower C-band licensing and operating rules to the Upper C-band, but it imposes more forward-leaning performance requirements. The Commission also generally adopts the Lower C-band technical rules for the Upper C-band, with certain modifications designed to reinforce a successful coexistence environment with adjacent band radio altimeters. The Order requires new licensees in the Upper C-band, as a condition of their licenses, to reimburse defined incumbent Fixed Satellite Service (FSS) licensees for reasonable and necessary costs associated with migrating FSS operations out of the reconfigured portion of the Upper C-band, consistent with the Commission's Emerging Technologies precedent. The Order also provides incentives to eligible space station operators that meet their clearing obligations by specified transition deadlines. Finally, new Upper C-band licensees must provide rebates for defined classes of eligible aircraft owners and operators to facilitate compliance with the FAA's radio altimeter retrofit requirements, which are designed to promote successful coexistence between Upper C-band licensees and radio altimeters in the 4.2-4.4 GHz band. summary_source: official summary_en: In this document, the Federal Communications Commission (Commission) adopted a Report and Order, Order of Proposed Modification, and Order on Reconsideration (Order), that expands the ecosystem for next-generation wireless services in the 3.7-4.2 GHz band (C-band) by making 160 megahertz of the 3.98-4.2 GHz band (Upper C- band) available for terrestrial wireless flexible use. This action is pursuant to Congress' direction in the One Big Beautiful Bill Act to complete a system of competitive bidding by July 4, 2027, for at least 100 megahertz of spectrum in the 3.98-4.2 GHz band. The Order creates a single 3.7 GHz Service that spans 3.7-4.14 GHz and adopts competitive bidding procedures for an auction. The Order largely applies the current Lower C-band licensing and operating rules to the Upper C-band, but it imposes more forward-leaning performance requirements. The Commission also generally adopts the Lower C-band technical rules for the Upper C-band, with certain modifications designed to reinforce a successful coexistence environment with adjacent band radio altimeters. The Order requires new licensees in the Upper C-band, as a condition of their licenses, to reimburse defined incumbent Fixed Satellite Service (FSS) licensees for reasonable and necessary costs associated with migrating FSS operations out of the reconfigured portion of the Upper C-band, consistent with the Commission's Emerging Technologies precedent. The Order also provides incentives to eligible space station operators that meet their clearing obligations by specified transition deadlines. Finally, new Upper C-band licensees must provide rebates for defined classes of eligible aircraft owners and operators to facilitate compliance with the FAA's radio altimeter retrofit requirements, which are designed to promote successful coexistence between Upper C-band licensees and radio altimeters in the 4.2-4.4 GHz band. provenance: doc_id: 2026-15598 doc_id_scheme: fr_docnum issuer: - Federal Communications Commission doc_type: Rule subtype: null action: Final rule. significant: null entities: - name: communications satellite type: artifact - name: millionradio type: UNKNOWN - name: V3 Starlink satellites type: artifact - name: Federal Communications Commission type: organization - name: Ethics Rules type: concept key_facts: [] related: [] related_auto: - name: SpaceX type: organization weight: 2.0 - name: agent_n8n_1_bot type: other weight: 1.0 - name: ABC type: organization weight: 1.0 - name: AI type: concept weight: 1.0 - name: Legal Framework type: organization weight: 1.0 title: Upper C-Band (3.98-4.2 GHz); Expanding Flexible Use of the 3.7 to 4.2 GHz Band --- # Upper C-Band (3.98-4.2 GHz); Expanding Flexible Use of the 3.7 to 4.2 GHz Band ## TL;DR In this document, the Federal Communications Commission (Commission) adopted a Report and Order, Order of Proposed Modification, and Order on Reconsideration (Order), that expands the ecosystem for next-generation wireless services in the 3.7-4.2 GHz band (C-band) by making 160 megahertz of the 3.98-4.2 GHz band (Upper C- band) available for terrestrial wireless flexible use. This action is pursuant to Congress' direction in the One Big Beautiful Bill Act to complete a system of competitive bidding by July 4, 2027, for at least 100 megahertz of spectrum in the 3.98-4.2 GHz band. The Order creates a single 3.7 GHz Service that spans 3.7-4.14 GHz and adopts competitive bidding procedures for an auction. The Order largely applies the current Lower C-band licensing and operating rules to the Upper C-band, but it imposes more forward-leaning performance requirements. The Commission also generally adopts the Lower C-band technical rules for the Upper C-band, with certain modifications designed to reinforce a successful coexistence environment with adjacent band radio altimeters. The Order requires new licensees in the Upper C-band, as a condition of their licenses, to reimburse defined incumbent Fixed Satellite Service (FSS) licensees for reasonable and necessary costs associated with migrating FSS operations out of the reconfigured portion of the Upper C-band, consistent with the Commission's Emerging Technologies precedent. The Order also provides incentives to eligible space station operators that meet their clearing obligations by specified transition deadlines. Finally, new Upper C-band licensees must provide rebates for defined classes of eligible aircraft owners and operators to facilitate compliance with the FAA's radio altimeter retrofit requirements, which are designed to promote successful coexistence between Upper C-band licensees and radio altimeters in the 4.2-4.4 GHz band. ## Key Points - Administrative practice and procedure / Communications / Communications common carriers / Radio / Reporting and recordkeeping requirements / Satellites / Telecommunications ## Details (本文なし。リンク先参照) ## Source 元記事: [Upper C-Band (3.98-4.2 GHz); Expanding Flexible Use of the 3.7 to 4.2 GHz Band](https://www.federalregister.gov/documents/2026/07/31/2026-15598/upper-c-band-398-42-ghz-expanding-flexible-use-of-the-37-to-42-ghz-band) — published 2026-07-31T00:00:00Z