EU CE-RED Update Effective: Stricter EMC Testing for 6G Massive MIMO Base Stations

Starting 9 May 2026, the revised harmonised standard EN 303 687 v1.2.1 under the EU Radio Equipment Directive (2014/53/EU) becomes mandatory. This update introduces stricter electromagnetic compatibility (EMC) requirements for 6G Massive MIMO base station equipment operating in sub-THz bands—specifically new radiated immunity and spurious emission limits. Exporters of such equipment from China and other third countries must undergo retesting by an EU-notified body (NB) to affix the CE marking; non-compliant devices will be barred from the EU market. Telecommunications infrastructure vendors, radio equipment manufacturers, and export compliance teams should treat this as a high-priority regulatory shift.

Event Overview

On 9 May 2026, the European Union enforced EN 303 687 v1.2.1, the latest harmonised standard supporting Directive 2014/53/EU (Radio Equipment Directive, RED). The standard now mandates additional EMC test requirements for 6G Massive MIMO base stations, including new radiated immunity criteria and spurious emission limits applicable to sub-terahertz (sub-THz) frequency bands. Testing complexity increases by 40% compared to prior versions. Devices placed on the EU market after this date must comply—and certification must be issued by an EU-notified body.

Impact on Specific Industry Segments

Radio Equipment Manufacturers (Base Station OEMs & ODMs): These firms design and produce Massive MIMO base stations intended for global deployment. The new standard directly affects product certification timelines and test engineering capacity. Compliance now requires sub-THz-level radiated immunity validation—beyond typical 5G FR2 test scopes—making existing test setups insufficient without upgrades or external lab engagement.

Export Compliance & Certification Service Providers: Entities facilitating CE marking—including conformity assessment consultants and NB-accredited labs—face increased demand for sub-THz EMC testing expertise. Capacity constraints are expected, especially among NBs with limited sub-THz chamber access or calibrated measurement systems. Lead times for full RED certification may extend significantly post-May 2026.

Telecom Infrastructure Integrators & System Suppliers: Companies integrating base station hardware into larger network deployments must verify updated CE documentation before procurement or project rollout. Non-compliant units already procured but not yet placed on the EU market may require re-evaluation or re-certification—potentially delaying delivery schedules or triggering contractual renegotiation.

Component Suppliers (RF Front-End, Antenna Array Modules): While not directly subject to RED, suppliers whose modules influence overall system-level spurious emissions or immunity performance may face tighter specification demands from OEMs. Design reviews and pre-compliance validation efforts are likely to intensify upstream to mitigate downstream retest risk.

What Relevant Enterprises or Practitioners Should Focus On — And How to Respond

Verify current certification status against EN 303 687 v1.2.1

Manufacturers and exporters must audit all active CE certificates for 6G-capable base stations. If issued under earlier versions (e.g., v1.1.1), retesting is mandatory—not optional—even if the device remains unchanged. No grace period applies post-9 May 2026 for new market placement.

Engage notified bodies early to secure test capacity and timeline alignment

Sub-THz EMC testing requires specialized anechoic chambers, calibrated field probes, and trained personnel. Not all NBs offer this capability. Firms should identify and contract with NBs that have publicly confirmed v1.2.1 readiness—and confirm chamber availability well ahead of planned submission dates.

Review technical documentation for sub-THz operational claims

The new limits apply only where equipment is declared to operate in sub-THz bands (e.g., above 100 GHz). If a base station’s declared frequency range stops at 71 GHz, v1.2.1 may not apply. However, marketing materials, datasheets, or firmware enabling future sub-THz operation could trigger scope inclusion—requiring careful boundary definition in the EU Declaration of Conformity.

Update internal EMC test protocols and supplier specifications

Manufacturers should revise internal pre-compliance checklists and RF design guidelines to reflect the new immunity test levels and spurious emission masks. Where component suppliers provide critical RF subsystems, updated procurement specs—referencing EN 303 687 v1.2.1 clauses—should be circulated and agreed upon before next-gen design freezes.

Editorial Perspective / Industry Observation

Observably, this update signals the EU’s deliberate alignment of RED with emerging 6G development trajectories—particularly its emphasis on sub-THz spectrum utilisation. It is less a sudden policy pivot and more a structured escalation of technical expectations already previewed in ETSI’s work programme and draft standards. Analysis shows that while the immediate impact is procedural (retesting, NB coordination), the longer-term implication lies in raising the barrier to entry for high-frequency radio equipment in the EU—especially for vendors without dedicated EMC engineering resources or NB relationships. From an industry perspective, this is best understood not as a one-off compliance event, but as the first binding milestone in a broader regulatory sequence covering AI-integrated radios, energy efficiency, and cybersecurity under RED’s evolving framework.

Conclusion: The enforcement of EN 303 687 v1.2.1 marks a concrete step in the regulatory maturation of 6G-enabling infrastructure—not merely a technical update, but a structural requirement shaping product development cycles, supply chain accountability, and market access strategy for radio equipment exporters. It is currently most appropriately understood as an enforceable compliance threshold, not a provisional guideline or voluntary benchmark.

Source Attribution:
• Official Journal of the European Union (OJEU) reference for EN 303 687 v1.2.1 publication
• European Commission Consolidated List of Harmonised Standards under Directive 2014/53/EU (as updated April 2026)

Note: Implementation timelines for national market surveillance enforcement and potential transitional arrangements for legacy stock remain subject to ongoing observation and are not confirmed in available public documents.