In the high-stakes world of telecommunications, moving from one major vendor to another is often compared to performing open-heart surgery on a marathon runner. Vladislav Zaimov, a seasoned expert in enterprise telecommunications and the risk management of vulnerable networks, understands these complexities better than most. Today, we sit down with Zaimov to discuss how industry giants are pivoting toward more agile, open architectures while simultaneously bridging the gap between ground-based cell towers and the burgeoning satellite market. We explore the tactical shifts in network modernization, the surge in mid-band capacity, and the strategic push toward a unified platform for satellite connectivity.
AT&T is utilizing a “popcorn” or “warm swap” strategy to modernize its RAN gear. How does this incremental approach change the risk profile compared to traditional network overhauls?
In the past, engineers lived in fear of “cold swaps” where you would cut over an entire region and pray that the lights stayed on. By adopting what they call a “popcorn” approach, the team is converting sector sites one by one, rather than waiting for massive cluster approvals that usually bog down a project. This “warm swap” allows Nokia and Ericsson gear to run concurrently for a time, which effectively builds a safety net that minimizes the risk of a catastrophic outage for the customer. It is quite a sight to see this move at such a breakneck pace, especially considering the project is on track to be 80% finished by the end of this year. Moving sector-by-sector provides a granular level of control that makes this the fastest deployment many industry veterans have ever witnessed.
With the Ericsson swap expected to move toward completion by early next year, what specific performance gains are being realized in terms of mid-band capacity and energy efficiency?
This is far more than a simple hardware trade; it is a total modernization of the network’s engine. By installing these new, modern radios, the carrier is finally able to “fully exercise” the mid-band capacity that had been sitting somewhat dormant. We saw a glimpse of this power when they leased spectrum from EchoStar and managed to roll out 3.45 GHz capabilities to nearly 23,000 cell sites in just a few short weeks. These new radios are much leaner on the power grid, providing a boost in energy efficiency that is crucial when you are lighting up both C-band and 3.45 GHz spectrum simultaneously. You can feel the shift in the network’s posture as it moves from just maintaining coverage to delivering high-performance, high-capacity throughput across the Northeast and Southern California.
The transition toward Open RAN principles includes deploying Fujitsu small cells in major cities like New York and Phoenix. How does this shift redefine the relationship between carriers and their hardware?
We are witnessing the end of the era of vendor lock-in, where a single company provided every bolt and line of code for a network. By adhering to O-RAN Alliance specifications and using 1Finity small cells, the carrier is proving that they can mix and match components from different providers without losing stability. This modularity gives the operator more leverage and the ability to innovate on their own terms rather than waiting for a vendor’s specific roadmap. In dense urban environments like New York City, this flexibility is a game-changer because it allows for more targeted, efficient densification. It’s a bold step toward a software-defined future where the network is as adaptable as the apps that run on it.
AT&T is integrating terrestrial networks with non-terrestrial layers via AST SpaceMobile. What are the technical advantages of having a network core that communicates directly with satellites?
The real magic happens when the terrestrial core can talk directly to the satellite constellation without needing a middleman or a complex workaround. Because the network core communicates directly with AST SpaceMobile, the system can manage the handoff between a cell tower and a satellite much more smoothly, which significantly reduces the likelihood of a dropped call. They are even using a specific RF interface to manage that interaction layer, ensuring that the transition feels seamless to the person holding the phone. While others in the space have a massive head start in terms of the number of satellites in orbit, this direct-to-core integration offers a performance edge that is hard to replicate. With 45 satellites expected to be in the air by the end of this year, the dream of a “network from space” is becoming a functional reality.
The recent intent to form a joint venture between major carriers suggests a unified front for satellite connectivity. How do you see the technical backend for D2D evolving to handle this multi-carrier collaboration?
This joint venture is a fascinating defensive and offensive maneuver designed to create a unified platform for direct-to-device satellite providers. On the backend, we are looking at the potential for new standards, possibly through 3GPP, to ensure that different carrier networks can interact with the same satellite constellation without friction. It is still the early days for this framework, and engineers are currently weighing whether existing standards are enough or if they need to build something entirely new from the ground up. The goal is to create a backend that allows a phone to find a signal regardless of whether it’s coming from a tower or a satellite orbiting hundreds of miles above. It’s a massive undertaking that will require a level of cooperation we haven’t often seen between these rival companies.
What is your forecast for the future of hybrid terrestrial-satellite networks?
I expect that within the next three years, the distinction between “cellular coverage” and “satellite coverage” will effectively vanish for the average user. As we see more successful voice call demos using existing spectrum and the deployment of more robust constellations, the “dead zone” will become a relic of the past. We will likely see a standardized management layer that automatically shunts traffic to the most efficient path, whether that is a 3.45 GHz small cell in a city or a satellite over a remote mountain range. The technical backend will become increasingly invisible, leaving the user with a permanent, unbreakable connection to the world. It is an exciting time to be in this field, as we are finally knitting together a truly global fabric of connectivity.
