RRA KS X 3270 5G NR Test Scope Expands to Six Bands

South Korea Expands 5G NR Conducted Test Scope: RRA Amends KS X 3270

South Korea's National Radio Research Agency (RRA) has broadened the conducted test requirements for 5G New Radio (NR) equipment, tripling the frequency bands in scope and adding a second duplex mode. The change amends KS X 3270, the conducted test method standard used in KC conformity assessment of 5G mobile radio equipment, and applies to new certifications entering the pipeline.

The RRA issued the amendment as a priority pre implementation notice on July 21, 2026, with the revised requirements taking effect July 24, 2026. Because it was published under the agency's prior enforcement mechanism, the updated test methods become applicable to new KC submissions ahead of the full formal standardization cycle leaving manufacturers a narrow window to align test plans.

What the RRA KS X 3270 5G NR amendment changes

Two substantive changes sit at the center of the revision:

Frequency band coverage expands from two bands to six. The amended standard adds n1, n3, n5, and n7 to the two 5G NR bands previously in scope, giving conducted testing under KS X 3270 a materially wider band set. These additions bring several core FR1 mid and low band allocations into the conducted test regime.

FDD duplexing is now supported alongside TDD. Previously, conducted testing under KS X 3270 accommodated only Time Division Duplex (TDD) operation. The revision introduces Frequency Division Duplex (FDD) support, aligning the test methods with paired spectrum 5G NR deployments that the earlier TDD only scope did not address.

Existing LTE band configurations are unchanged by this amendment. The revision is confined to the 5G NR conducted test methods; it does not alter the radiated test standard (KS X 3271) or LTE characteristic testing (KS X 3142).

What this means for manufacturers

For any manufacturer, importer, or test lab with 5G NR devices moving toward KC certification, this is a scope change that lands at the test planning stage rather than at the paperwork stage.

• Devices operating in n1, n3, n5, or n7 now fall squarely within the conducted test scope. Products that would previously have been tested against a narrower band set must now be evaluated against the expanded KS X 3270 methods. Test plans scoped before July 24, 2026 may no longer be complete.

• FDD 5G NR products gain a defined conducted test path. Manufacturers of paired-spectrum 5G NR equipment including devices reusing FDD allocations historically associated with LTE bands now have an applicable conducted method, but must ensure their chosen lab's accredited scope covers FDD 5G NR under the revised standard.

• The short pre implementation lead time compresses planning. With the notice issued July 21 and effect from July 24, there is minimal runway. Submissions built on the prior scope risk deficiency findings if they reach the RRA or a designated body after the effective date.

• In market and legacy approvals are not directly disturbed by the amendment as written the change targets the test methods applied to new conformity assessments. Manufacturers should nonetheless confirm whether variant additions or re tests to existing approvals will be assessed under the revised methods.

  
  

The practical action is to confirm, before submission, that

(a) the device's operating bands are correctly mapped to the expanded scope,

(b) the duplex mode is covered, and

(c) the chosen test lab's accreditation reflects the amended KS X 3270 methods.

Certification impact summary

Dimension	Before amendment	After amendment (effective July 24, 2026)
Standard affected	KS X 3270 — 5G NR conducted test methods	KS X 3270 — 5G NR conducted test methods (amended)
5G NR bands in scope	2 bands	6 bands (adds n1, n3, n5, n7)
Duplex modes supported	TDD only	TDD and FDD
LTE band configurations	In scope, unchanged	Unchanged
Radiated test standard (KS X 3271)	Not affected	Not affected
Certification scheme	KC conformity assessment (broadcasting/communication equipment)	KC conformity assessment new submissions tested to revised methods
Instrument type	—	Priority pre implementation (prior-enforcement) notice

Timeline and required actions

Date	Event	Required action
July 21, 2026	RRA issues priority pre-implementation notice amending KS X 3270	Review notice; assess exposure of 5G NR products in the KC pipeline
July 24, 2026	Revised conducted test methods take effect for new KC submissions	Ensure all new 5G NR test plans reflect the six band scope and TDD/FDD support
Immediately (ongoing)	Expanded scope applies to n1, n3, n5, n7 and FDD devices	Confirm test lab accreditation covers amended KS X 3270; re-scope pending submissions
Before each new submission	Conformity assessment against revised methods	Verify band to scope mapping, duplex coverage, and lab scope prior to filing
On formal standardization completion	Full KS X 3270 amendment finalized through standard cycle	Track for any further clarifications or scope adjustments beyond the pre implementation text