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1、外文：Long-distancesupervisorysystemdataterminalresearchBasedonGPRS1introductionWiththedevelopmentofcomputertechnology,Internettechnologyisparticularlyextensiveandin-depthvariousaspectsofpeople'slives.makepeople'sliveshasundergoneaprofoundchange.Asindustrialareas,becauseoftheneedtocontrolareas,mon
2、itoringofawiderangeofobjects,hencetheneedtospendalotofmanpower,materialandfinancialresourcesforequipmentmaintenance.Moreover,therearemanyadverseconditions,itisnoteasytostaytheoccasionalmomentofarrivalornotsomefielddatacollection.Iftheamountofwiringworkitisnottheeconomy,isunreasonable.Thishashel
3、pedwirelesscommunicationstechnologydevelopmentinthefieldofremotemonitoring.GPRS(GeneralPacketRadioService),astheexistingGSMnetworkevolutionofthetransitiontothethirdgenerationmobilecommunicationtechnologyfor(2.5G),withrapidaccess,alwaysonline,sobytheflowmeterfeaturesRemotereal-timedatatransmissi
4、oninasuddenunmatchedadvantages.2GPRStechnologyGPRS(GeneralPacketRadioService)isbasedontheGSMmobilenetworksystems,theuseofpacketswitchingtechnology,compatiblewithGSM,andhigh-speeddatatransmissionnetworks,GPRSintheGSMnetworktointroduceatraditionalthreenewcomponents:PCU(PacketControlUnit,acontrolu
5、nit).SGSN(ServingGPRSSupportNode.GPRSservicenodesupport)andGGSN(GatewayGPRSSupportNode.GatewayGPRSsupportnode)withthefollowingcharacteristics:ThehighutilizationrateofresourcestotheintroductionoftheGPRSpacketswitchingmodeoftransmission,Onlyuserssendorreceivedataonlyduringtheoccupationofresources
6、Thismeansthatmanyuserssharethesamewirelesscommunicationsandhighefficiency,therebyincreasingtheutilizationofresources.9GSMcircuitswitcheddatatransmissionmethodsandmodelsfortheentirelinkperiod,WhetheruserstransmitdataalonewilloccupyChannel.GPRS用户的计费按通信的数据流量为计费标准。GPRSBillingusersbytheflowofdatacom
7、municationsfortheaccountingstandards.GPRSdatatransmissionspeedofhigh-speedtransmission57.6KB/s.thehighestattainable115-117.2kb/sfullymeetuserneeds.AccesstowaitforashorttimeGPRSaccesstimeisshort,fastconnectivity,theaverage2s.Online
