Vodafone, Telefónica and Deutsche Telekom ran a live 5G broadcast trial on September 1, during the first-round DFB Cup match between HEBC Hamburg and Borussia Dortmund at Hamburg's Volksparkstadion. RTL Deutschland aired the match on its own channels, giving the carriers a genuine broadcast environment rather than a controlled demo.

The three operators used Network APIs, Quality on Demand and Network Slicing to carry production signals — camera feeds, interview audio, commentary and a real-time return feed — across their commercial mobile networks. They split the workload into five workflows and assigned a specific technology to each.

What did the trial actually test?

Voice between the control room and camera crews ran over the network API. Fan interviews, stadium footage and half-time segments travelled as mobile video. A commentary audio feed and a real-time return feed to on-site staff completed the picture. Network Slicing secured sufficient bandwidth and a constant data rate for the camera signal itself.

The carriers' joint readout calls Quality on Demand and Network Slicing "suitable for supporting selected live-production workflows over mobile networks." Read that twice: "selected." Not all of them, not yet.

How does Network Slicing change the picture?

The carriers' release flags the issue plainly: at major sporting events, large numbers of people access the mobile network at the same time, which can cause congestion. Standard mobile broadband is best-effort, so the more users in a cell, the more your throughput sags. Slicing reserves a piece of the RAN and core for a specific service, with a guaranteed bitrate and a latency ceiling.

That is where slicing earns its keep. It carves out a guaranteed lane through a network that would otherwise be buckling under matchday load, which is the difference between a clean broadcast and a frozen frame at the worst moment.

Why are three competitors sharing one stage?

Vodafone, Telefónica and Deutsche Telekom are rivals in the German consumer market, yet they co-operated on this trial rather than running three separate proofs-of-concept. It's unusual for the country's mobile sector, where shared infrastructure usually means a tower rather than a broadcast workflow.

The trial also gives the GSMA and European broadcasters a German reference point for the Network API template. Hamburg's Volksparkstadion is now part of that case file.

What's next?

None of the carriers nor RTL has announced a commercial deployment date. The joint readout calls the trial "an important foundation for further technical development and future deployment in live-production environments." Expect quieter pre-commercial pilots through the 2026-27 Bundesliga season, with the next big public milestone at a 2027 tournament rather than on a routine matchday.

Amara Osei covers European telecom for Telecom Gazette.