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                          三分彩定位

                          2019-04-14 17:37:46 来源:宜宾新闻网

                          新浪5分彩计划网

                          U.S.PresidentDonaldTrumpsaidFridayattheWhiteHousethattheU.S.governmentwouldfreeupmuchwirelessspectrumandbuildbetterinfrastructuretotakealeadershipin5G,thenext-generationwirelessnetwork.Itcameafterthecountry'sFederalCommunicationsCommission(FCC)announcedFridayaplantostartlargestspectrumauctionandspendover20billionU.S.dollarsforruralhigh-speedinternet.FCCchairmanAjitPaisaidthatAmericanwirelesscarrierswouldbebiddingforasmuchas3.4gigahertzof"millimeter-wave"spectrumstartingonDec.10thisyear.Verizon,oneofAmerica'slargesttelecommunicationscompanies,announcedonApril3theofficialoperationofitscommercial5GnetworkintwoAmericancities,makingittheworld'sfirstcommercial5Gmobileserviceforcustomerswith5G-equippedsmartphones.WhiletheUnitedStatesleadsinsomekey5G-readinessmetrics,Chinaandothercountriesareaheadinmakingcriticalmid-bandspectrumavailablefor5G,accordingtoareportmadeinAprilbyCTIA,atradeassociationrepresentingtheU.S.wirelesscommunicationsindustryandcompaniesthroughoutthemobileecosystem.Themillimeter-wavespectrumorhigh-bandspectrumtobeauctionedoffreferstofrequenciesabove24GHz.Itscapacityishigherbutitscoveragelowerthanthemid-bandspectrum.Sothemid-bandspectrumcantravelfartoprovidebroaderservicethanthehigh-bandspectrum.Anotherchallengefor5Gserviceisthecountry'sweakerinfrastructureinruralareas,accordingtotheCTIAreport.Trumpsaidthe5GindustryintheUnitedStateswouldbe"privatesector-drivenandprivatesector-led,"sotheU.S.governmentdoesnothavetospendlotsofmoney.ButtheFCCunveiledaplantoprovide20.4billionU.S.dollarsinthecomingdecadetoconnectupto4millionruralhomesandsmallbusinessestohigh-speedinternet.ThisispartofFCC'sthree-part5GFastPlan,namely,spectrumfreeing-up,smallantennasinstallmentanddeploymentofopticalfiber,accordingtoPai.Trumpdescribedinhisspeechthebuildingof5Gservicearacethat"Americamustwin,"and"willwin."ButFCCCommissionerJessicaRosenworcelsaidinherTwitteraccountonFriday,"fromimposingtariffson5Gequipmenttoalienatingallieson5Gsecuritytofallingbehindtherestoftheworldoncriticalmid-bandspectrum,"theTrumpadministrationhasyettoofferaworkableplanforU.S.leadership."SofarthisAdministration'sinterventionson5Ghavedonemoreharmthangood,"saidRosenworcel.

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