Arhitectura functionala GSMBSS Base Station System
BTSBSCBTS
TCNNS
In cazul unei configuratii multibanda putem avea:3x2 TRX 900Mhz + 3x2 TRX 1800Mhz in acelasi cabinetEchipamente BSSBTS Evolium Base Tranceiver Station: Alcatel 9100
Echipamente BSSBTS Evolium Base Tranceiver Station: Alcatel 9100
12 TRX BTS with dualband, EFR and GPRS insideContinuous improvement in design with backward compatibility:Standard version (1998)EFR, dualband, 12 TRXEvolution Step 1 (2000)AC power supply, integrated Microwave,3x2 indoor MINI cabinetEvolution Step 2 (2000)EDGE/GPRS/GSM new standard TRXStand-alone UMTS Node B: (2001)Multistandard BTS (2002)UMTS TRX plug-in
Arhitectura functionala GSMinterfete si protocoale
GCRAuCEBCDFGHIAbisBCDEFGHIPSTNISDNBTS - BSC MSC-VLR(SM-G)MSC-HLRHLR-VLR(SM-G)MSC-MSC (SS7 basic) + MAPMSC-EIRVLR-VLRHLR-AuCMSC-GCRMSC-PSTN(SS7 basic) + TUP or ISUPMSC-ISDNLAPD(ISDN type)GSM Circuit-switching:(BSSAP = BSSMAP + DTAP)ABSC - MSC(SS7 basic) + BSSAPLAPDm(GSM specific)Um (Radio)MS - BTS BSCBSCMSCMSCBTSPSTN / ISDNMS
Schimburi in retea: secventa tipica de apel
MOBILECHANNEL REQUESTIMMEDIATE ASSIGNMENTCM SERVICE REQUESTAUTHENTICATION REQUESTAUTHENTICATION RESPONSECIPHERING MODE CMDCIPHERING MODE COMPLETESET UPCALL PROCEEDINGASSIGNMENT CMDASSIGNMENT COMALERTINGCONNECTCONNECT ACKSET-UP of anRR CONNECTION (MO)SERVICE INDICATIONAUTHENTICATIONTRANSITION to CIPHERING MODESTART of CALLTRAFFIC CHANNELCALL CONFIRMATIONCALL ACCEPTEDASSIGNMENTPSTN or ISDN
Schimburi in retea: stabilirea unei conexiuni radio
SDCCH N MM CM_SERVICE REQUESTSDCCH NRACHMSCHANNEL REQUESTIMMEDIATE ASSIGN.BTSBSCMSCUmA bisACHANNEL REQUIREDASSIGNMENT of anSDCCH ChannelCHANNEL ACTIV.ACTIVATION ofChannel indicatedCHANNEL ACTIV. ACKAGCHCONNECTION to theSDCCH ChannelSABMESTABLISH INDIC.SCCP CONNECT REQUESTSCCP CONNECT CONFIRMT3101T9105IMM. ASSIGN. CMDRRRR MM CM_SERVICE REQUESTRRBTSMBTSMBTSMUA MM CM_SERVICE REQUEST MM CM_SERVICE REQUEST
Schimburi in retea: actualizarea locatiei
RACHAGCHSDCCHCHANNEL REQUESTIMMEDIATE ASSIGN.CHANNEL REQUIREDCHANNEL ACTIV.CHANNEL ACTIV. ACKSABMUAESTABLISH INDIC.SCCP CONNECT REQUESTSCCP CONNECT CONFIRMIMM. ASSIGN. CMDMSBTSBSCMSCUmA bisAVLRSCCP DATADATA REQUESTLOCATION UPDATING ACCEPTTMSITMSI REALLOC COMPLETEDATA INDICATIONSCCP DATAHLRUPDATE LOCATION AREAUPDATE LOCATION UPDATE LOCATION ACC INSERT SUBSCR. DATA LOC. AREA UPD. ACC.INSERT SUB. DATA ACK TMSI Alloc.RRRRMMRRBTSMBTSMBTSMMAPMAPMAPMAPMAPMAPMM
Schimburi in retea: handover intra BSC
PSTN or ISDNFACCHRelease of old channelChangeover to new channelInternal Handover decisionMEASUREMENT REPORTHANDOVER COMMANDCHANNEL ACTIV.CHANNEL ACTIV. ACKSABMUAESTABLISH INDIC.MSBTS 1BSCMSCUmA bisASCCP DATADATA REQUESTDATA INDICATIONHandover CmdH.O. PerformedHandover. compl.BTS 2(RELEASE REQUEST)Local EndHANDOVER ACCESS(access burst)HANDOVER DETECTIONPHYSICAL INFOHANDOVER COMPLETET8RF CHANNEL RELEASERF CHANNEL RELEASE ACKRRMEASUREMENT REPORTMEASUREMENT REPORTMEASUREMENT REPORTRRBTSMBTSMRRRRRRRRRRBTSMBTSMBSSMAPRR(old)(new)
OMC-X: Operation and Maintenance CentreX: BSS/NSS/Transmisiunianalizeaza alarmele din entitatiinstaleaza noi elemente de softwareparametrizeaza elementele
OSS: Operations Support System
OSS (Operations Support System) Network Management Center (Operation & Maintenance)
SGSNGGSNOMC-GOMC-SMSC/VLRHLRNMCQ3MFSBSSOMC-R
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