Japan's Four Major Carriers Sign 28 GHz mmWave Sharing Deal

Four-Operator Coordination Shifts mmWave Economics

KDDI, NTT DOCOMO, SoftBank, and Rakuten Mobile signed a memorandum on September 11, 2026 to study shared use of 5G millimeter-wave base stations, repeaters, and related equipment at 28 GHz. The public announcement came September 16. Each carrier will continue its own deployment, but the study targets joint infrastructure in areas where independent buildouts are uneconomical.

This matters because mmWave coverage has been the weak link in enterprise 5G for campuses, ports, and manufacturing sites. High capacity over short distances is the value proposition, but range limitations and penetration losses have constrained deployments to dense urban cores or controlled indoor environments. A coordination model reduces the risk that a single operator abandons coverage in a marginal location, which translates to lower planning risk for enterprises evaluating mmWave for local wireless links.

The immediate budget impact is limited—this is a study, not a commercial rollout. But the agreement signals that Japanese operators see shared infrastructure as necessary for mmWave viability beyond initial high-value zones. For enterprise buyers, that means mmWave coverage expansion becomes more credible as a fiber alternative or complement, especially for temporary or hard-to-wire locations.

Nokia Claims 20% Spectral Efficiency Gain in AI-RAN Trials

Nokia said September 16 that its AI-RAN platform delivered more than 20% spectral-efficiency improvement in trials with operators including e& and NTT DOCOMO. The company is accelerating AI-RAN adoption through proofs of concept and live trials.

The 20% figure is significant because it quantifies the performance claim against rivals like Samsung, Ericsson, and NVIDIA-aligned AI-RAN plays. Spectral efficiency directly affects how much capacity an operator or private network owner can extract from a given MHz allocation. For enterprises buying private 5G or considering network modernization, this changes the calculation on spectrum costs, cell counts, and upgrade timing.

The catch is that the number comes from vendor-reported trials, not production networks under load. Procurement teams should treat this as a technology readiness indicator rather than a guaranteed outcome. But it does suggest that AI-driven RAN optimization is moving from research to measurable field performance, which makes it a relevant factor in 2027-2028 network planning cycles.

Samsung and Verizon Demonstrate 6G Sensing at Texas Sports Event

Samsung demonstrated AI-based integrated sensing and communication with Verizon at a Texas sports event in July using a virtualized network to detect movement and crowd density. The company's newsroom released the announcement September 15, 2026.

The near-term enterprise impact is minimal—this is an early 6G positioning play, not a product. But it is relevant to smart venue, industrial safety, and security use cases where sensing could become a native network feature rather than a separate sensor layer. For buyers planning multi-year infrastructure roadmaps, this signals that future RAN upgrades may include integrated sensing as a baseline capability, which could change the economics of deploying dedicated radar or video-based systems.

The demo is thin on operational details like accuracy, latency, or interference management, so it is more useful as a roadmap signal than a buying trigger. But it raises competitive pressure on equipment vendors and operators that are still focused only on throughput and coverage.

KDDI and SpaceX Target Starlink Mobile V2 by End of 2027

KDDI reached an agreement with SpaceX on August 10 to bring Starlink Mobile V2 to au Starlink Direct, targeting service by the end of 2027 in areas outside terrestrial mobile coverage. The announcement came September 15, 2026. The capability claims include native voice calls and higher-speed mobile data.

This competes directly with satellite-to-device partnerships being built by Vodafone, AT&T, Verizon, and T-Mobile. For enterprise buyers, the direct consequence is improved continuity for fleets, utilities, field services, and remote-site operations that need coverage beyond terrestrial reach. The 2027 timeline means this is a future resilience option, not a current procurement choice, but it does affect how enterprises should think about backup connectivity and roaming economics in non-terrestrial network scenarios.

Granite Launches Multi-Carrier SIM for FWA and IoT

Granite Telecommunications launched SIM360 on September 15, built with Thales, with carrier-direct profiles from AT&T, T-Mobile, and Verizon on a single SIM for domestic IoT and fixed wireless access. The product supports remote carrier selection and automatic failover through Granite's management platform.

This reduces outage risk for distributed sites that want FWA as primary or backup access. The business case is strongest for enterprises that value continuity more than absolute lowest monthly circuit cost. It competes with single-carrier enterprise connectivity offers from the major U.S. operators and with other multi-carrier IoT platforms, but the differentiator is operational resilience across all three major networks rather than dependence on one.

What to Watch

The Japan mmWave sharing study will set a precedent for other markets where independent operator buildouts are stalling. If the study leads to a formal sharing framework, expect similar proposals in Europe and North America, which would accelerate mmWave availability for enterprise use cases. Nokia's AI-RAN performance claims will face competitive response from Samsung and Ericsson—watch for counter-claims or independent validation in the next quarter. The Starlink Mobile V2 timeline matters because it sets the cadence for satellite-to-device competition and will affect how operators price terrestrial coverage extensions versus non-terrestrial backup.