美聯(lián)邦航空管理局(FAA)發(fā)布了一份機(jī)場(chǎng)名單，據(jù)悉，名單中的這些機(jī)場(chǎng)周圍將有臨時(shí)緩沖區(qū)，那里禁止在1月下旬啟用新的5G覆蓋，禁止時(shí)間為期6個(gè)月。在這段時(shí)間里，該機(jī)構(gòu)和航空業(yè)將努力確保目前的飛機(jī)設(shè)備不會(huì)被運(yùn)營(yíng)商用于擴(kuò)展其5G網(wǎng)絡(luò)的新頻率所干擾。
機(jī)場(chǎng)名單包括美國(guó)各地一些最大的國(guó)際樞紐，如紐約市的約翰-肯尼迪國(guó)際機(jī)場(chǎng)、洛杉磯國(guó)際機(jī)場(chǎng)和芝加哥的奧黑爾國(guó)際機(jī)場(chǎng)。它們包括運(yùn)營(yíng)商計(jì)劃在1月19日激活5G覆蓋的C波段頻率的地區(qū)。據(jù)FAA新聞室周五發(fā)布的消息，交通量、低能見度天數(shù)和地理位置都是影響哪些機(jī)場(chǎng)需要緩沖區(qū)的因素。
在C波段上線后的六個(gè)月里，包括ATT和Verizon在內(nèi)的無線公司將關(guān)閉發(fā)射器并對(duì)這些緩沖區(qū)內(nèi)機(jī)場(chǎng)周圍3.7-3.98GHz頻率的C波段5G信號(hào)進(jìn)行其他調(diào)整。這將使得它們不會(huì)干擾在4.2-4.4GHz頻率下運(yùn)行的航空設(shè)備。
這些設(shè)備包括無線電高度計(jì)，它為飛機(jī)系統(tǒng)提供準(zhǔn)確的高度讀數(shù)。FAA和航空業(yè)一直擔(dān)心C波段信號(hào)會(huì)干擾飛機(jī)在惡劣天氣和低能見度時(shí)在機(jī)場(chǎng)降落時(shí)所依賴的讀數(shù)。
在緩沖區(qū)啟用的六個(gè)月里，F(xiàn)AA將跟航空公司和制造商合作以測(cè)試在C波段5G信號(hào)中運(yùn)行的高度計(jì)并取消對(duì)使用高度計(jì)的飛機(jī)的限制，這些高度計(jì)在這些環(huán)境中可以安全飛行。根據(jù)FAA的C波段常見問題頁面，那些不安全的高度計(jì)將被改造或替換。
臨時(shí)緩沖區(qū)包括完全禁止C波段5G信號(hào)的著陸跑道周圍略多于一英里的范圍，并為飛機(jī)在降落時(shí)提供20秒的無信號(hào)時(shí)間。
無線行業(yè)對(duì)這些區(qū)域有一個(gè)更具體的輪廓，它將在跑道前后2100米以及兩側(cè)910米范圍內(nèi)延伸。根據(jù)代表無線行業(yè)的貿(mào)易組織CTIA提供給CNET的一份文件，運(yùn)營(yíng)商將在跑道前后6100米的較窄路徑上減少C波段信號(hào)并限制地平線以上的信號(hào)功率。
緩沖區(qū)是美國(guó)運(yùn)營(yíng)商做出的另一項(xiàng)妥協(xié)，以確保他們即將推出的C波段服務(wù)不會(huì)干擾關(guān)鍵的飛機(jī)儀器。Verizon和ATT分別在11月和1月推遲了他們的C波段發(fā)射，并在全美范圍內(nèi)降低了廣播的功率水平。
以下為在1月19日之后的6個(gè)月內(nèi)將有緩沖區(qū)的機(jī)場(chǎng)的完整名單：
Austin-Bergstrom International Airport in Austin, Texas
Laurence G. Hanscom Field in Bedford, Massachusetts
King County International Airport in Seattle, Washington
Birmingham-Shuttlesworth International Airport in Birmingham, Alabama
Nashville International Airport in Nashville, Tennessee
Bob Hope Airport in Burbank, California
Akron-Canton Airport in Canton, Ohio
Charlotte Douglas International Airport in Charlott, North Carolina
Dallas Love Field in Dallas
Dallas/Fort Worth International Airport in Dallas-Fort Worth metroplex
Detroit Metropolitan Wayne County Airport in Detroit
Ellington Airport in Houston
Newark Liberty International Airport in Newark, New Jersey
Fresno Yosemite International Airport in Fresno, California
Fort Lauderdale-Hollywood International Airport in Fort Lauderdal, Florida
Bishop International Airport in Flint, Michigan
William P. Hobby Airport in Houston
Tweed-New Haven Regional Airport in New Haven, Connecticut
George Bush Intercontinental Airport in Houston
Indianapolis International Airport in Indianapolis
Long Island MacArthur Airport in Ronkonkom, New York
John F. Kennedy International Airport in New York City
Harry Reid International Airport in Las Vegas
Los Angeles International Airport in Los Angeles
LaGuardia Airport in New York City
Long Beach Airport in Long Beach, California
Kansas City International Airport in Kansas City
Orlando International Airport in Orlando, Florida
Harrisburg International Airport in Middletown, Pennsylvania
Chicago Midway International Airport in Chicago
McAllen International Airport in McAllen, Texas
Miami International Airport in Miami
Minneapolis-Saint Paul International Airport in Minnesota
Ontario International Airport in Ontario, California
O'Hare International Airport in Chicago
Paine Field in Snohomish County, Washington
Palm Beach International Airport in West Palm Beach, Florida
Philadelphia International Airport in Philadelphia
Phoenix Sky Harbor International Airport in Phoenix
St. PeteClearwater International Airport in Clearwate, Florida
Pittsburgh International Airport in Pittsburgh
Raleigh-Durham International Airport in Morrisvill, North Carolina
Frederick Douglass - Greater Rochester International Airport in Rocheste, New York
Seattle-Tacoma International Airport in Seattle
San Francisco International Airport in San Francisco
Norman Y. Mineta San Jose International Airport in San Jose, California
John Wayne Airport in Santa Ana, California
St. Louis Lambert International Airport in St. Louis
Syracuse Hancock International Airport in Syracus, New York
Teterboro Airport in Teterbor, New Jersey
