美聯邦航空管理局(FAA)發布了一份機場名單,據悉,名單中的這些機場周圍將有臨時緩沖區,那里禁止在1月下旬啟用新的5G覆蓋,禁止時間為期6個月。在這段時間里,該機構和航空業將努力確保目前的飛機設備不會被運營商用于擴展其5G網絡的新頻率所干擾。
機場名單包括美國各地一些最大的國際樞紐,如紐約市的約翰-肯尼迪國際機場、洛杉磯國際機場和芝加哥的奧黑爾國際機場。它們包括運營商計劃在1月19日激活5G覆蓋的C波段頻率的地區。據FAA新聞室周五發布的消息,交通量、低能見度天數和地理位置都是影響哪些機場需要緩沖區的因素。
在C波段上線后的六個月里,包括ATT和Verizon在內的無線公司將關閉發射器并對這些緩沖區內機場周圍3.7-3.98GHz頻率的C波段5G信號進行其他調整。這將使得它們不會干擾在4.2-4.4GHz頻率下運行的航空設備。
這些設備包括無線電高度計,它為飛機系統提供準確的高度讀數。FAA和航空業一直擔心C波段信號會干擾飛機在惡劣天氣和低能見度時在機場降落時所依賴的讀數。
在緩沖區啟用的六個月里,FAA將跟航空公司和制造商合作以測試在C波段5G信號中運行的高度計并取消對使用高度計的飛機的限制,這些高度計在這些環境中可以安全飛行。根據FAA的C波段常見問題頁面,那些不安全的高度計將被改造或替換。
臨時緩沖區包括完全禁止C波段5G信號的著陸跑道周圍略多于一英里的范圍,并為飛機在降落時提供20秒的無信號時間。
無線行業對這些區域有一個更具體的輪廓,它將在跑道前后2100米以及兩側910米范圍內延伸。根據代表無線行業的貿易組織CTIA提供給CNET的一份文件,運營商將在跑道前后6100米的較窄路徑上減少C波段信號并限制地平線以上的信號功率。
緩沖區是美國運營商做出的另一項妥協,以確保他們即將推出的C波段服務不會干擾關鍵的飛機儀器。Verizon和ATT分別在11月和1月推遲了他們的C波段發射,并在全美范圍內降低了廣播的功率水平。
以下為在1月19日之后的6個月內將有緩沖區的機場的完整名單:
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