Every four years, the World Radiocommunication Conference revises the ITU Radio Regulations — the treaty under which every satellite filing, every coordination agreement, and every national spectrum plan ultimately shelters. The conference runs on consensus among administrations, which means outcomes are shaped years in advance in regional preparatory groups — CEPT in Europe, CITEL in the Americas, the APT in Asia — and in the ITU-R study groups where industry engineers argue about interference models line by line. By the time the conference opens, most results are already visible in the preparatory record to anyone who reads it.
That is the first practical point: WRC-27 is not a 2027 event. The positions are forming now, in 2026, and the companies that treat the preparatory cycle as part of their corporate strategy — rather than something the regulatory team monitors — consistently come away with the rules they need. The second practical point is the venue. The ITU has selected Shanghai, placing the conference in China at a moment when spectrum and orbital resources are being read, correctly, as instruments of industrial and geopolitical competition. Expect that context to colour everything below.
Here are the five fights worth a place on a management agenda.
1. Direct-to-device: the blockbuster (Agenda Item 1.13)
The headline commercial question of the conference is whether satellites may use the mobile industry’s own frequencies — the terrestrial bands between roughly 694 MHz and 2.7 GHz identified for IMT, the technical name for the mobile-phone system — to connect directly to ordinary smartphones. The ITU’s working parties have coined an ungainly name for it, “DC-MSS-IMT”, but the market knows it as direct-to-device, and it is the regulatory shadow of the most dramatic transactions of the past year: SpaceX paying tens of billions for EchoStar’s terrestrial licences precisely to secure direct-to-cell spectrum, and AST SpaceMobile building its business on borrowed mobile-operator frequencies.
Today, direct-to-device in terrestrial bands operates through national improvisation — regulators such as the FCC authorising satellite use of a mobile operator’s licensed spectrum within one country’s borders. Agenda Item 1.13 asks whether the international table of allocations should recognise the practice properly. The battle lines are instructive. Satellite direct-to-device hopefuls and their mobile-operator partners want a clear framework. Incumbent mobile-satellite operators holding L-band and S-band rights warn that new allocations could interfere with the very MSS bands their businesses occupy, and argue no treaty change is needed for D2D in existing satellite bands. Much of the terrestrial mobile world is defensive about anything that complicates its cleanest, most harmonised bands. And administrations split accordingly: several Americas administrations have formally supported the studies, while European advisory opinion has been notably cooler about the adjacent Agenda Item 1.14 (a generic new mobile-satellite allocation in similar ranges), on the ground that it could endanger terrestrial networks in some of the world’s best-harmonised spectrum.
What to watch: which specific bands survive the study process, and whether the outcome is a genuine allocation or a hedged framework loaded with protective conditions. For any company whose plan involves connecting standard handsets from orbit, the difference is the difference between a global product and a patchwork of national permissions.
2. The fight that isn’t on the agenda: EPFD limits
The largest single pool of contested value at WRC-27 is attached to an item that, formally, does not exist. Article 22 of the Radio Regulations caps the power that non-geostationary constellations may deliver towards geostationary satellites — the “equivalent power flux density” limits, adopted provisionally in 1997 and set in 2000, based on satellite technology as it stood in the mid-1990s. Low-Earth-orbit broadband operators, led by SpaceX and supported by a growing coalition, argue the limits are wildly overprotective and throttle the capacity of modern constellations; geostationary incumbents such as SES and Viasat argue the limits are the regulatory certainty on which billions of GSO investment rests, and that “modernisation” is market-share politics dressed as engineering.
WRC-23 resolved the stand-off by commissioning technical studies to be reported to WRC-27 — without creating an agenda item to act on them. The reformers’ path therefore runs through WRC-27 to a possible decision at WRC-31, a timetable the American debate is already trying to compress: the FCC opened its own review of the domestic GSO-NGSO sharing regime in 2025, and US policy voices are pressing for leadership on modernisation. The strategic significance is hard to overstate. Loosened EPFD limits would directly increase the deliverable capacity — and therefore the enterprise value — of every LEO broadband system, and diminish the interference shelter that underpins legacy GSO fleets. Boards on both sides of that line should treat the study-group record as material information.
3. The upper mid-band squeeze: terrestrial 6G versus everyone
The mobile industry arrives at every conference hungry for mid-band spectrum, and this cycle its attention has settled on ranges above 7 GHz that satellite services, science missions and defence systems currently occupy. The pattern is familiar from previous conferences — the 3.5 GHz and C-band battles that reshaped satellite economics and produced enormous clearance payments — and the stakes rhyme: where terrestrial IMT is identified, satellite incumbents face constraint, relocation, or, occasionally, compensation. For satellite operators the exposure is defensive; for investors the lesson of the American C-band, where clearing incumbents were paid billions, is that forced migration can be an asset as well as a threat, depending entirely on the regulatory terms. Companies with earth stations, feeder links or payloads in the contested ranges should be mapping their exposure band by band now, while positions are still fluid.
4. Space-to-space links: the plumbing item with architectural consequences (Agenda Item 1.11)
Quietly consequential is the proposal to authorise space-to-space links in the classic L- and S-band mobile-satellite frequencies — allowing satellites to relay traffic between orbits in bands designed for links between space and the ground. Together with the continuing Ka-band satellite-to-satellite work from the last cycle, this is the treaty catching up with how modern architectures actually function: LEO constellations handing data to relays, direct-to-device satellites backhauling through other spacecraft, Earth-observation systems streaming through commercial relay networks in real time. The commercial punchline is that relay and “space data” businesses — an emerging sector in its own right — need these allocations to exist as regulated services rather than clever workarounds. Anyone building or funding an inter-satellite relay proposition should be following this item’s technical annexes closely, because the conditions written there will define the product.
5. The Moon gets a spectrum plan (Agenda Item 1.15)
Finally, the conference will consider allocations for communications in the lunar environment — the beginning of a formal spectrum regime for cislunar space. It sounds exotic; it is actually the earliest stage of the same story this series keeps telling. The first regime for any new domain sets the precedents, and the administrations and companies participating in the studies now — space agencies planning lunar relay networks, and the commercial providers hoping to sell them capacity — are writing rules the next several decades of lunar activity will inherit. The commercial market is small today and the strategic option value is not. Watch which national delegations invest effort here; it is a reasonable proxy for who intends to be present on and around the Moon in the 2030s.
How to read the next eighteen months
Three habits convert this from spectator sport into strategy. First, follow the regional groups, not just Geneva: CEPT and CITEL draft positions are public, they harden early, and a company’s best chance of shaping an outcome is a well-argued contribution through its administration while drafts are still bracketed. Second, read the study-group record on the items that touch your business — the interference assumptions being agreed in working parties this year are the parameters your products will live under from 2028. Third, treat the conference as a source of tradeable information: agenda outcomes will reprice direct-to-device ventures, LEO broadband capacity, GSO fleets and mid-band satellite assets, and the preparatory record telegraphs those outcomes months in advance to the small community that reads it.
Shanghai will produce a revised treaty either way. The only question is whether your company’s interests are represented in the room, or merely affected by it.