AT&T and Ericsson have demonstrated 5G network sensing, a technique that repurposes radio signals already carrying traffic across a mobile network to detect objects and movement in the surrounding environment.

The demonstration, reported by TelecomTV, pairs the largest US mobile operator by revenue with its primary radio access network vendor. Their working relationship dates back to the 2023 Open RAN contract under which Ericsson took over management of AT&T's entire nationwide RAN, a deal worth roughly $14 billion over five years. The sensing showcase extends that partnership beyond conventional connectivity into an emerging capability area that 3GPP is working to standardise.

Network sensing, sometimes called Joint Communication and Sensing (JCAS), exploits a simple physical property: radio waves bounce off objects before reaching a receiver. By analysing how those reflections distort the signal — changes in phase, timing and Doppler shift — the network can infer the presence, position, speed or trajectory of objects near the transmitter and receiver. In effect, every base station becomes a potential radar installation without new hardware.

The attraction for operators is commercial as much as technical. Sensing requires no dedicated sensors and reuses spectrum already licensed for mobile service. Vendor discussions around the technology point to use cases including traffic monitoring, intrusion detection, drone detection, weather measurement and support for autonomous vehicles. Some industry estimates suggest network sensing could open new revenue pools for operators in enterprise and public-sector markets, though no such projections have yet hardened into commercial commitments at scale.

That distinction matters. Demonstrations like the AT&T–Ericsson trial show the technology functioning in a controlled setting; they do not establish a product, a paying customer or a deployment schedule. Vendors including Ericsson, Nokia, Huawei and ZTE have all promoted sensing demos in recent years, and each remains at the trial rather than the commercial stage. The gap between lab performance and network-wide reliability — particularly in dense urban environments where signals scatter off countless surfaces — is the central engineering question the industry has yet to answer publicly.

Standards work frames the timeline. 3GPP agreed to study channel modelling and use-case requirements for JCAS as part of its Release 19 work, which runs alongside the evolution of 5G-Advanced. That positions sensing as a Release 19-era feature, meaning commercial specifications are unlikely to be frozen before 2025–2026, with network implementations following afterwards. Any AT&T deployment would therefore depend on chipset support, device compatibility and spectrum regulatory clearance in the United States — areas where the FCC has not yet issued sensing-specific rules.

For Ericsson, the demo reinforces the value of its position as AT&T's anchor RAN supplier at a moment when the operator is mid-way through one of the largest network transformations in the US market. AT&T is simultaneously upgrading to open, programmable architecture and expanding mid-band 5G coverage, and capabilities such as sensing offer a path to monetising that infrastructure beyond connectivity subscriptions.

For now, the demonstration stands as evidence of technical feasibility between two of the industry's largest players rather than a product announcement. Whether 5G network sensing becomes a revenue-generating service for AT&T will become clearer once 3GPP Release 19 specifications are finalised and vendors begin shipping sensing-capable radios and software in the second half of the decade.