Verizon is warning that 6G needs a major uplink rethink.
The concern comes from rising AI demand. Today, mobile networks mostly serve downloads. Phones receive video, apps, and web content. Uploads use much less capacity.
That model may soon look outdated.
Future AI services could send constant data from devices. Smart glasses may stream video, sound, and sensor details. AI agents may then process that information nearby, or in the cloud.
Yago Tenorio, Verizon’s chief technology officer, sees a sharp traffic shift ahead. “Everything puts pressure on the uplink. You need more capacity, but the device is less capable,” said Tenorio.
This creates a difficult engineering problem. Wearables are small, light, and power constrained. They cannot carry many antennas. They also cannot manage much heat.
At the same time, they may need stronger upload performance. This could strain future networks quickly.
Tenorio believes existing improvements may not be enough. “We’re missing a breakthrough that will probably have to go all the way down to the architecture…There is a very real uplink demand that I don’t think we can satisfy just with incremental improvement,” he said.
One possible answer is uplink and downlink decoupling. In simple terms, networks could separate upload and download paths. Each could use different spectrum resources.
That approach may give operators more flexibility. For example, midband spectrum could support downloads. Lowband spectrum could help uploads reach the network more reliably.
Ericsson has described this idea as giving each traffic direction its own road. That could reduce pressure on one shared channel. It may also help devices transmit with less effort.
However, the concept raises deployment questions. More uplink receivers may need placement closer to users. That could increase network complexity and cost.
Tenorio asked whether operators should examine that structure. “Can we think of a full decoupling of uplink and downlink? And a deployment that is much more pervasive of uplink receivers everywhere that are listening and are close to the customer…reducing and relieving the uplink for the device?”
He also added caution. “It’s just an example. Maybe it’s not needed. Maybe it’s not practical. We’ll see about it,” he added.
Other carriers are also watching uplink capacity. T-Mobile is studying decoupling for 6G. It is also improving uplink in 5G-Advanced networks.
AT&T also views lowband spectrum as useful for uploads. Its 600MHz plans include uplink-enhancing radio technology from Ericsson.
The wider message is clear. Operators do not want 6G built only around speed claims. They want networks designed around real services.
Tenorio put that goal directly. “We have the opportunity to design 6G with use cases in mind…as opposed to just specify it from speed and latency and performance, and then hoping that the use cases will make use of it,” he said.
The next two years may prove decisive. AI wearables, sensing, and edge services need practical network support. If uplink demand grows as expected, 6G must carry traffic both ways.
