Standardization Roadmap

The Road to 3GPP Adoption

Technical merit is necessary but not sufficient for standards adoption. 3GPP is a consensus-driven body with ~400 company members; any new waveform must pass technical review, IPR analysis, vendor consensus, and testing before becoming standard. This section traces the expected path for OTFS from research prototype to 6G standard.

Definition:
3GPP Waveform Adoption Process

A new waveform enters 3GPP via this sequence:

1. Study Item (1-2 years): informal technical evaluation. Demonstrates feasibility. Competing proposals documented.

2. Work Item (1-2 years): formal specification. Detailed signal flow, numerology, procedures. Defeats or merges competing waveforms.

3. Specification Freeze: Release-specific freeze date. Beyond this, only editorial changes.

4. Testing & Validation: interoperability tests (IOT), conformance tests (CT), plugtests.

5. Certification: GCF/PTCRB certification for commercial launch.

OTFS timeline:

Rel. 20 Study Item: 2026-2028.
Rel. 21 Work Item: 2028-2030.
Rel. 21 Freeze: ~2030.
Rel. 22 commercial: 2030-2032.

Theorem: OTFS Intellectual Property Landscape

As of 2026, the OTFS intellectual property landscape:

Core OTFS modulation: Cohere Technologies (founding patents ~2007+). Extends to ISFFT/SFFT application, Heisenberg transform, basic DD-domain processing.
Detection algorithms: Diverse ownership. Raviteja-Hong- Viterbo-Caire MP detection ( $\sim$ academic). Ramachandran- Chockalingam MIMO-OTFS detection. Hybrid licenses.
Cell-free OTFS (Chapter 17): CommIT/TU Berlin + Mohammadi-Ngo-Matthaiou (RCSI Belfast + TU). Academic-friendly.
LEO OTFS (Chapter 18): Buzzi-Caire-Colavolpe. Academic.

FRAND licensing: 3GPP requires IPR holders to license on Fair, Reasonable, And Non-Discriminatory terms. Cohere has committed to FRAND for core OTFS. License fee expected: $\sim 0.5\%$ - $1\%$ of chip revenue — comparable to MPEG-4 or LDPC licensing.

Consequence: IPR is a moderate issue for OTFS adoption, comparable to established 5G waveforms. Not a blocker.

OTFS is a newcomer compared to OFDM (patents expired decades ago, freely usable). Licensing friction is non-zero: chip vendors must pay $\sim 0.5$ - $1\%$ to Cohere per unit. This is real money at mass-market scale but manageable. The CommIT academic contributions are essentially patent-free — standards bodies prefer these anchors for core specifications.

Proof

Cohere's patents

Cohere holds $\sim 100$ patents related to OTFS modulation. Committed to FRAND licensing for 3GPP-standardized variants.

CommIT contributions

Academic papers (Raviteja 2018, Mohammadi 2023, Buzzi 2024) are IPR-free at publication. Implementations based on these papers carry no royalty.

License cost

FRAND rates for waveforms: 0.1-2% typical. OTFS expected at 0.5-1%. Comparable to LDPC, H.264.

Standardization

3GPP prefers minimal IPR encumbrance. Likely outcome: hybrid standard using Cohere's base OTFS + CommIT's academic enhancements, with FRAND guarantees. $\blacksquare$

Definition:
5G to 6G Migration Path

Migration from 5G NR (OFDM) to 6G (OFDM + OTFS) proceeds in stages:

Stage 1 — 5G Advanced (Rel. 18-19, 2024-2026): Extensions of 5G NR. Enhanced numerologies for mobility. Experimental OTFS in NTN sidelink.

Stage 2 — 6G Foundation (Rel. 20-21, 2026-2030): Dual-mode UEs support both OFDM (5G NR compat) and OTFS (new). Scheduler selects per-session. Key use cases: LEO, V2X, industrial high-mobility.

Stage 3 — 6G Broad Deployment (Rel. 22+, 2030+): OTFS becomes the primary waveform for mmWave, sub-THz, and mobile scenarios. OFDM retained for low-mobility sub-6 GHz and legacy device support.

Legacy support: 5G NR UEs continue functioning on 6G infrastructure (OFDM fallback). No forced obsolescence. Gradual UE replacement over 2030-2040.

Example: Operator Rollout Plan

A Tier-1 mobile operator (e.g., T-Mobile US) plans 6G rollout. Map the rollout sequence from 2025 to 2032.

Solution

2025-2026

5G Advanced rollout. Enhanced NR numerologies for mobility. LEO integration (Starlink Direct-to-Cell). OTFS in pilot deployments at research sites.

2027-2028

6G Foundation infrastructure deployment. Dual-mode (OFDM + OTFS) BSs in select cities. UEs with OTFS support in flagship devices (premium handsets).

2028-2030

6G commercial launches. Specific services rolled out:

V2X: dedicated OTFS sidelink in 77 GHz automotive band.
LEO: multi-satellite OTFS for remote areas.
Mobile broadband: dual-mode BS; scheduler picks waveform.

2030-2032

Mass 6G rollout. Mid-market UEs with OTFS. Legacy 5G UEs continue on OFDM fallback. Cell-free OTFS in select high-density urban.

2032+

OTFS ubiquitous in mobile + NTN + V2X. Pure 6G networks. OFDM retained for legacy and low-mobility use cases.

Theorem: Standardization Risks

Three primary risks threaten timely OTFS standardization:

Enhanced OFDM wins study item: proponents (Ericsson, Nokia) may argue that 5G Advanced's enhanced numerologies suffice for 6G mobility, obviating OTFS.
IPR friction: Cohere's patent claims may expand beyond FRAND expectations. 3GPP would prefer academic-only anchors.
Vendor indecision: chip and BS vendors delay OTFS commitments waiting for "the other side" to lead.

Mitigation:

CommIT contributions (Chapters 17-18) demonstrate OTFS's gains in specific use cases that enhanced OFDM cannot match.
Academic anchors (Raviteja 2018, Mohammadi 2023) provide IPR-free alternatives.
Early adopter operators (possibly China, Japan) may commit to OTFS, forcing vendor investment.

Consequence: OTFS adoption timeline carries 1-2 year uncertainty. Rel. 21 (2028-2030) is the base case; slippage to Rel. 22 (2030-2032) possible if any risk materializes.

Standards adoption is political as well as technical. The technical case for OTFS is strong (CommIT contributions, demos). The political risks are: vendor inertia, IPR friction, and enhanced-OFDM proponents. A 1-2 year delay is a real possibility. Commercial preparation should plan for both Rel. 21 and Rel. 22 timelines.

Proof

Historical precedent

Every new waveform faces adoption friction: OFDM in 4G (5 years from research to mass adoption), NOMA in 5G (never fully adopted), DFT-s-OFDM in 5G (simplicity won).

OTFS advantages

Unlike NOMA, OTFS has specific non-overlapping use cases (high mobility, NTN) that enhanced OFDM cannot replicate. This avoids the "why bother" objection.

IPR resolution

FRAND commitment from Cohere + academic alternatives reduce IPR risk. Standards body will tolerate modest license fees.

Timeline assessment

Rel. 21 (2028-2030) base case; Rel. 22 (2030-2032) fallback. Commercial deployment: 2030+. $\blacksquare$

Key Takeaway

OTFS is on track for Rel. 21 (2028-2030) with 1-2 year risk. Study item in Rel. 20, specification in Rel. 21, first commercial by 2030. Dual-waveform 6G air interface. Mass adoption 2032+. Earlier than many previous waveform transitions — driven by CommIT contributions and clear high-mobility + NTN + ISAC use cases.

🔧Engineering Note

OTFS Ecosystem State (2026)

OTFS ecosystem state as of 2026:

3GPP: Active study items in Rel. 19 workshops on OTFS for NTN. Rel. 20 study item planning in progress. Expected evaluation 2026-2027.

Industry activity:

Cohere Technologies: actively licensing OTFS IP. Reference designs available.
Chip vendors: Qualcomm (committed), MediaTek (evaluating), Samsung LSI (evaluating). Expected first OTFS prototypes on silicon 2027-2028.
BS vendors: Ericsson (experimenting, cautious), Nokia (experimenting), Mavenir (exploring for Open RAN). Commercial BS 2029+.

Academic: Active research in $\sim 20$ universities globally. CommIT (TU Berlin) group is the leading theoretical contributor. Standardization input from MIT, Stanford, Technion, and Chinese universities.

Government:

US DoD: interested in OTFS for military applications (jamming-resistant, mobility).
Chinese MIIT: OTFS in 6G White Papers. Expected early commercial deployment.
EU: conservative on waveform choice. OTFS adoption linked to Rel. 21 outcome.

Testbeds:

OTFS-V2X: CCN, Cohere + automotive partners.
OTFS-NTN: SpaceX Starlink (experimental), OneWeb (planned).
OTFS-CF: CommIT partners (cell-free prototype).

Overall: healthy ecosystem activity. OTFS not guaranteed for 6G, but probability is high ( $\sim 80\%$ per industry estimates).

Practical Constraints

•
3GPP study items: Rel. 19-20 active
•
Chip vendors: Qualcomm leads, others catching up
•
Academic: ~20 universities active
•
Probability of 6G adoption: ~80%

Multi-Domain Multiple Access with OTFS

Animation showing the 5D resource space of MDMA: time, frequency, spatial, delay, Doppler. Contrasts with 2D OFDMA and shows how orthogonal users populate different DD grid cells, dramatically increasing user capacity per cell. The visual case for OTFS as the 6G access layer.

Common Mistake: Don't Commit to 2028 Before Rel. 21 Freezes

Mistake:

Operators and vendors planning hardware for "2028 6G OTFS launch" based on expected Rel. 21 freeze. If Rel. 21 slips to 2030+, hardware obsoletes before deployment.

Correction:

Plan hardware with 1-2 year flexibility. Dual-mode (OFDM + OTFS) UEs can deploy on 5G Advanced infrastructure (no OTFS dependence) and upgrade to OTFS via firmware when standardized. Minimizes risk of stranded hardware. Infrastructure vendors: software- definable RAN enables gradual OTFS rollout. Platforms like O-RAN enable "pay as you go" OTFS adoption.

Why This Matters: Next: Pulse Shaping Beyond Ideal

Chapter 20 dives into a practical aspect of OTFS deployment: pulse shaping. Ideal OTFS analysis assumes rectangular pulses (or Gaussian, or prolate spheroidal — whatever is convenient). Real systems need pulses with finite duration, bounded PAPR, minimal ISI, and orthogonality under channel dispersion. This is deeply related to the design of DFT-s-OFDM's root-raised cosine pulses — OTFS has analogous design choices.

Implementation Complexity Assessment Chapter Summary