ceivedif-ferentbasestationsaroundthesignal,sothatthebasestationsignalproducejackknife,producetabletenniseffect,whichseriouslyaffectedthenormaluseofthecellphone;Inthetoppartoflargebuildings,enterin-doorwirelesssignalissocluttered,bothofthebaseseveralnearbysignal,alsohavenotfarfromthebasesta-tion,refractedthroughdirectsignal,reflection,diffractionmeanssuchasenterindoor,causeindoorreceivedsignalandstrongandweakextremelyunstable,withfrequency,adjacentfrequencyinterferenceisveryse-rious.Mobilephoneuseinthisenvironment,whentheidlestatevillagere-electionfrequent,mu-nicationfrequentswitch,voicequalityaffectedconsiderably,easytoproducethephenomenontodropwords.Inaddition,insomebuildings,althoughcellphonescannormalconversation,buttheuserdensityistoobig,channelisverycrowded,mobilephoneonlinedifficult.
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