AT&T Inc.


T -1.17%

and

Verizon


VZ -0.17%

Communications Inc. said they would restrict some of their fifth-generation wi-fi services and products for six months whereas federal regulators overview the signals’ earn on airplane sensors, an effort to defuse a warfare that has roiled both industries.

The cell phone carriers detailed the proposed limits Wednesday in a letter to the Federal Communications Commission. The corporations said they would decrease the signals’ cell-tower energy ranges nationwide and impose stricter energy caps shut to airports and helipads, in accordance with a duplicate reviewed by The Wall Avenue Journal.

“While we remain confident that 5G poses no risk to air security, we’re also tranquil to the Federal Aviation Administration’s desire for extra analysis of this effort,” the companies said in the letter to FCC Chairwoman

Jessica Rosenworcel.

Wireless alternate officials maintain held frequent talks with FCC and FAA experts to communicate referring to the interference claims and capacity fixes, in accordance with of us accustomed to the matter.

An FCC spokesman said the agreed-upon limits “signify one of the vital comprehensive efforts on this planet to safeguard aviation applied sciences” and the agency will work with the FAA “so as that 5G networks deploy both safely and .”

A spokesman for the FAA known as the proposal “a in actual fact necessary and encouraging step, and we’re committed to persisted positive dialogue with the total stakeholders.” The FAA believes that aviation and 5G service in the band telecom corporations maintain deliberate to employ can safely coexist, he said.

Wireless alternate executives don’t demand the immediate-time interval limits to noticeably impair the bandwidth they provide customers attributable to networks already relate signals far from planes and airport tarmacs, in accordance with one more person accustomed to the matter.

Soundless, the voluntary limits are a rare step for wi-fi corporations that residence a excessive price on the spectrum licenses they lend a hand. U.S. carriers spent $81 billion to come to a decision licenses for the 5G airwaves in demand, known because the C-band, and spent $15 billion extra to put together them for service this chilly climate.

The carriers earlier this month delayed their rollout plans till early January after FAA leaders raised concerns referring to the deliberate 5G service. Air-security officials jumpy the brand new transmissions would maybe also confuse some radar altimeters, which airplane employ to measure their distance from the bottom.

At one more match closing week, FAA Administrator

Steve Dickson

said conducting flights in a stable system and tapping spectrum for 5G services and products can both occur. He said the demand became once the explicit scheme to “tailor both what we’re doing in aviation so as that it dovetails with utilizing this particular spectrum.”

Mr. Dickson said one more center of attention is utilizing the spectrum in other facets of the world and among the finest ways it differs when put next with the U.S. “That’s what the discussions are that we’re having with the telecoms apt now.”

U.S. wi-fi corporations ship 5G signals over decrease frequencies than the altimeters, but air-security officials jumpy that some significantly tranquil sensors would maybe also tranquil bag cell-tower transmissions. Regulators in Canada and France maintain also imposed some immediate-time interval 5G limits.

The carriers’ letter said the mitigation measures would provide extra time for technical analysis “without waiver of our factual rights associated with our enormous investments in these licenses.”

C-band limits are most connected to AT&T and Verizon, which paid premiums to do away with licenses for the brand new signals ready for employ in December 2021. The corporations tranquil blueprint to launch their service, enviornment to the brand new limits, in January 2022. The proposed limits would lengthen to July 6, 2022.

Rival carrier

T-Cell US Inc.

is less at risk of delay attributable to it spent a smaller amount for licenses which would possibly maybe presumably maybe maybe be eligible for employ in December 2023. It also controls a swath of licenses trusty for 5G that aren’t enviornment to air-security claims.

Write to Drew FitzGerald at andrew.fitzgerald@wsj.com and Micah Maidenberg at micah.maidenberg@wsj.com

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