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1、Long-distancesupervisorysystemdataterminalresearchBasedonGPRS1introductionWiththedevelopmentofcomputertechnology,Internettechnologyisparticularlyextensiveandin-depthvariousaspectsofpeople'slives.makepeople'sliveshasundergoneaprofoundchange.Asindustrial
2、areas,becauseoftheneedtocontrolareas,monitoringofawiderangeofobjects,hencetheneedtospendalotofmanpower,materialandfinancialresourcesforequipmentmaintenance.Moreover,therearemanyadverseconditions,itisnoteasytostaytheoccasionalmomentofarrivalornotsomefie
3、lddatacollection.Iftheamountofwiringworkitisnottheeconomy,isunreasonable.Thishashelpedwirelesscommunicationstechnologydevelopmentinthefieldofremotemonitoring.GPRS(GeneralPacketRadioService),astheexistingGSMnetworkevolutionofthetransitiontothethirdgener
4、ationmobilecommunicationtechnologyfor(2.5G),withrapidaccess,alwaysonline,sobytheflowmeterfeaturesRemotereal-timedatatransmissioninasuddenunmatchedadvantages.2GPRStechnologyGPRS(GeneralPacketRadioService)isbasedontheGSMmobilenetworksystems,theuseofpacke
5、tswitchingtechnology,compatiblewithGSM,andhigh-speeddatatransmissionnetworks,GPRSintheGSMnetworktointroduceatraditionalthreenewcomponents:PCU(PacketControlUnit,acontrolunit).SGSN(ServingGPRSSupportNode.GPRSservicenodesupport)andGGSN(GatewayGPRSSupportN
6、ode.GatewayGPRSsupportnode)withthefollowingcharacteristics:ThehighutilizationrateofresourcestotheintroductionoftheGPRSpacketswitchingmodeoftransmission,OnlyuserssendorreceivedataonlyduringtheoccupationofresourcesThismeansthatmanyuserssharethesamewirele
7、sscommunicationsandhighefficiency,therebyincreasingtheutilizationofresources.GSMcircuitswitcheddatatransmissionmethodsandmodelsfortheentirelinkperiod,WhetheruserstransmitdataalonewilloccupyChannel.GPRS用戶的計費按通信的數(shù)據(jù)流量為計費標(biāo)準(zhǔn)。GPRSBillingusersbytheflowofdatac
8、ommunicationsfortheaccountingstandards.GPRSdatatransmissionspeedofhigh-speedtransmission57.6KB/s.thehighestattainable115-117.2kb/sfullymeetuserneeds.AccesstowaitforashorttimeGPRSaccesstimeisshort,fastconnectivity,theaverage2s.Onlineuser
