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