3GPP Sets 6G Standards Path To March 2029 Code Freeze

A Standards Clock Starts For 6G

3GPP has moved 6G from a long-range research topic into a formal standards schedule.

The specifications group agreed at a Singapore plenary meeting last week that the first 6G standards will be completed in early 2029, giving vendors and operators a defined timetable for the next wireless generation.

The work sits inside Release 21, which will include both the first 6G specifications and 5G-Advanced.

The timeline gives the industry 33 months to finish the release.

That matters for network equipment makers, chipset suppliers and operators because 6G product planning now has a standards calendar rather than only research trials and conference targets.

Release 21 Creates Four Technical Checkpoints

The first work items for 6G and 5G-Advanced are scheduled for approval with a first functional freeze in March 2027.

A later freeze is due in June 2028, with a March 2028 checkpoint for 80% of the work to be completed.

The stage 3 freeze is set for December 2028, followed by the full and final code freeze in March 2029.

That sequence points toward commercial deployment around 2030, but the important near-term effect is more practical.

Vendors can align silicon, radio access network software and test programs around named freeze dates.

Operators can also start comparing migration paths without waiting for the full specification package to close.

The Single-Drop Strategy Tries To Avoid 5G Fragmentation

3GPP is treating 6G differently from the early 5G cycle by planning a single code freeze.

Ruth Brown, senior principal analyst for mobile networks at Omdia, said early planning documents called for 6G specifications to arrive as "a single drop" or code freeze.

Brown linked that approach to problems from 5G Release 15, when an early 5G Non-standalone drop was followed by another drop a few months later.

In her assessment, that forced some vendors to develop parallel code bases or build silicon for fast-changing specifications.

A single 6G drop is meant to keep dependencies aligned before hardware and software commitments become too expensive to reverse.

The dependency problem is larger in 6G because the physical radio layer cannot be finalized in isolation.

Brown pointed to session management and routing protocol work from RAN1 and SA2 as requirements for capabilities including "AI-native air interface and integrated sensing and communication (ISAC)."

September Will Narrow The Migration Choices

The standards timetable leaves major architecture questions unresolved.

Guy Daniels, co-founder of TelecomTV, wrote that the September 2026 plenary has been pencilled in for pruning 6G migration options and identifying which architectures will support the 5G-to-6G transition.

That decision affects radio access network hardware already shipping, not only future 6G systems.

Ericsson separately said early decisions now include waveform, modulation, channel coding, a basic security framework and supported bandwidths.

The agreed downlink waveform uses cyclic-prefix orthogonal frequency-division multiplexing, or CP-OFDM.

Uplink has two options: CP-OFDM and discrete Fourier transform spread OFDM, known as DFT-s-OFDM.

Supported bandwidths range from 3MHz to 400MHz, while 5G channel codes will be largely reused in 6G.

Operators Now Have Near-Term Tests

The next checkpoints are no longer abstract.

Technical debate continues before March 2027, the September 2026 plenary will narrow migration architecture choices, and the World Radiocommunication Conference next year is expected to be another reference point for the emerging 6G plan.

Gabriel Brown, senior principal analyst at Omdia, said telcos have moved from being "cautious" about 6G to "embracing it." The practical question is whether that interest turns into migration plans that protect current 5G investments while giving vendors enough certainty for silicon, radio and software roadmaps before the March 2029 code freeze.