GPRS核心网的建设策略和发展规划方案(1)

!TN929.5!A!1009-6868(2005)03-0047-03/LIUChao!qing(100035)(BeijingP&TConsulting&DesignInstituteCo.,Ltd.,Beijing100035,China)!GPRSGPRS#GPRSGPRS$GPRS%%3GPRSGPRSGPRS$GPRS#!$$$Abstract:TherealcapacityandexistingproblemsofGeneralPacketRadioService(GPRS)networkareanalyzedanditsconstructionprinciple,planningschemeandsecuritypolicyarediscussed.ThedesigningofaGPRSnetworkscaleshouldbebasedonthenumberofclientsthatcanbeactivatedsimultaneously.Asinsomeregionswhereexistsmuchdifferencebetweentheregisteredclientnumber,attachedclientnumberandactivatedclientnumber,closeattentionshouldbepaidtonetworkstatisticaldataandnetworkoperationstatus,andthenthesupportingcapabilityofGPRScorenetworkcanbeaccordinglyobtained.Astosystemsecurity,twoissuesinboththetechnologicallevelandmanagementlevelshouldbeconsidered.Keywords:GPRS;corenetwork;planningscheme;securitypolicyGSM#InternetInternet#GSMGSM(GPRS)2.5#GPRSGSM4##GPRSGPRS#GPRSGPRS#1GPRS%%GPRS!GPRS(GGSN)%GPRS(SGSN)#(%%%)#GPRS(MSC)#Jun.2005Vol.11No.320056113&’47!##$%&’(()*+&,+’*-!GPRSGPRS!!GGSNSGSN!!Gn/Gi(IP)!100Mb/s2!!(A)2.1GPRSAGPRS!SGSN#GGSN#(DNS)#(CG)2002$2003AGPRSAGPRS%(1)SGSNA3!3MotorolaSGSN!22(1)!1MSC!37.2%54.0%&120!15MSC!44.4%2NokiaSGSN!SGSN5148!17MSC!16.5%&SGSN5224!2MSC!4.3%#ACMNET(2)GGSNA#3GGSN!Cisco7206VXR!273GGSN!1.1%AGPRS18.610!SGSN16!(22%00$23%00)(PDP)3000AGPRS!GPRS!%!’E(!GPRS!GPRS!!(HLR)GPRS!GPRSGPRS!GPRS!2.2GPRS%(1)!!(2)!!!(3)PDP(4)GPRS!Gb(5)!!!(6)!GPRS!GPRS!GPRS(!!)2.3AGPRS%!%100b/s!%0.64!PDP%0.05!%5.4!%0.25!PDP!GPRS!PDP’(!!#GnGi2004A330!80GPRS!GPRS!60%GPRS!60%GPRS!70%GPRS!GPRS=(330!80)60%60%70%=103.32GPRS!2004GPRS20!70%!2004SGSN176!GGSN5%!!5%!15%!2004PDP=(103.3+20)15%=18.5!70%!GGSN26.4PDP!!!2004GGSN!##$%&’(()*+&,+’*-%GPRS20056113)*Jun.2005Vol.11No.348!2GGSN!1SGSNGn/Gi=1233000!10010001000=123.3Mb/s!GPRSA1#2SGSNGGSNPDP(Context)!A2MotorolaSGSN50%!MotorolaSGSNNokiaSGSN!GGSNGGSNGGSNPDPContext!GPRSGPRS!GPRS!3GPRSGPRSGPRSGPRS!(MPLS)(VPN)MPLSVPNGPRS!GPRS!GPRS!3.1GPRS$(1)GPRS$GPRS(VLAN)(ACL)%GiGPRSGiVLANVLAN%!(2)Gn$!(3)$GPRS(IPSec)%!(APN)APN!3.2GnMPLSVPNVPNGPRSGn!3.330%70%GPRS#!4GPRSGPRSGPRSGPRS#!GPRSGPRS!GPRS##3GPRSGPRSGPRS!()A85()A9Jun.2005Vol.11No.320056113&’49!##$%&’(()*+&,+’*-$GPRS!4IP3G!$2004-11-30