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BSSbsc
DX200BSC
DX200BSCGeneralDescription
TrainingDocument
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No.of
pages
49/TT
Editor/Translator
31-Oct-97
MiiaSjögren
Author
25-Sep-97
AlmutNaujeck
Approvedby
25-Sep-97
StephanFlick
Previousissue
(1.0)approved
14-Feb-97
1.OBJECTIVES
2.BSCINTHEGSMNETWORK
3.BSCFUNCTIONS
3.1.ConfigurationandManagementoftheRadioResources
3.2.Handovermanagement
3.3.Frequencyhoppingmanagement
3.3.1.Nofrequencyhopping
3.3.2.Basebandhopping
3.3.3.SynthesizedFrequencyHopping
3.4.SignallingbetweenMSCandBSC
3.5.SignallingbetweenBSCandBTS
3.6.TerrestrialChannelManagement
3.7.Interfaces
3.8.Encryptionmanagement
3.9.Operation
3.10.Maintenance
3.11.MeasurementandObservation
3.12.SupporttoCallControl
3.13.ExtensionStrategy
3.14.Configuration
4.CAPACITYOFTHEBSC1E,BASICANDEXTENSIONCONFIGURATION
4.1.CapacityoftheBSC1E,Basicconfiguration
4.2.CapacityoftheBSC1E,BasicandExtensionConfiguration
4.3.Lay-outofcartridgesofDX200BSC1E
5.CAPACITYOFTHEBSC2E,BASICANDEXTENSIONCONFIGURATION
5.1.CapacityoftheBSC2E,BasicandExtensionConfiguration
6.BLOCKDIAGRAMOFTHEBSC
7.FUNCTIONOFTHEFUNCTIONALUNITSINTHEBSC
8.EXCHANGETERMINAL,ET
8.1.ExchangeTerminal,ET1E
8.1.1.GeneralfunctionsoftheET(ET1E,ET2E):
8.1.2.SpecialfunctionsoftheET1E
8.1.3.ET1C,ExchangeTerminalCartridge
8.2.ExchangeTerminal,ET2E
8.2.1.GeneralfunctionsoftheET(ET1E,ET2E):
8.2.2.SpecialfunctionsoftheET2E
8.2.3.LEDindicators
8.2.4.ET5C,ExchangeTerminalCartridge
9.GROUPSWITCH,GSW
9.1.Plug-inUnitsintheGroupSwitchcartridge,SW1C
9.2.SwitchingoperationintheGSW
10.GROUPSWITCH,GSWB
10.1.Plug-inUnitsintheGroupSwitchcartridge,SW1C
11.SUBMULTIPLEXER
11.1.SMUXunitsintheMCMUcartridge
11.2.OperationoftheSMUX
12.CLOCKANDSYNCHRONISATIONUNIT,CLS
12.1.GeneralfunctionsoftheCLS
12.2.ClockandSynchronisationUnitCartridge,CLS
13.MARKERANDCELLULARMANAGEMENTUNIT,MCMU
13.1.Plug-InUnitsintheMC1Mcartridge
14.BSCSIGNALLINGUNIT,BSCU
14.1.GeneralfunctionsoftheBCSU
14.2.Plug-InUnitsintheMC1Mcartridge
15.OPERATIONANDMAINTENANCEUNIT
15.1.Plug-InUnitsintheOMUcartridge
16.WINCHESTERANDFLOPPYDRIVEUNITS
17.POWERSUPPLYSYSTEMINTHEBSC
17.1.DC/DCconvertersintheBSC
17.2.PowerredundancyintheBSC
18.DX200BSC,MML
1.Objectives
ThismoduledescribesthefunctionsoftheBSC,it’scapacityandconfiguration.Ideallyafterstudyingthismaterialyoushouldbeableto:
-GivenaBSSnetworkexampledesignanAbis-Interfacestructureforit(BSSexercise)
-CalculatethecapacityrequiredwithintheBSCtoservethisexample(BSSexercise)
-Calculatethenumberof2Mbit/slinksintheA-andAter-Interfacesforthisexamplenetwork.(BSSexercise)
2.BSCintheGSMNetwork
BaseStationController,BSC,isapartoftheBaseStationsub-system,BSS.ItisresponsibleforthemanagementoftheradionetworkintheBSS.
BSCislocatedbetweentheMSC(TC)andtheBTSs.
Fig.2.1BaseStationControllerintheGSM/DCS1800network
3.BSCFunctions
ConfigurationandManagementoftheRadioResources
-BCF,BTSandTRXmanagement
-channelallocation
-channelrelease
-radiolinksupervision(measurementhandling)
-powercontrol(BTSandMS)
BCCH/CCCHmanagement
BroadcastControlChannel/CommonControlChannel
-FCCHFrequencyCorrectionChannel
-SCHSynchronisationChannel
-BCCHBroadcastControlChannel
-RACHRandomAccessChannel
-AGCHAccessGrantChannel
-PCHPagingChannel
TCH/SDCCHmanagement
-SDCCHStandaloneDedicatedControlChannel
-SACCHSlowAssociatedControlChannel
-FACCHFastAssociatedControlChannel
-TCH/FTrafficChannelFullRate
Fig.3.1RadiochannelsmanagementintheBSC
Handovermanagement
HandoversinGSMarebasedonthefollowingparameters:
-Signalquality(badsignalquality,up/downlink)
-Signallevel(weaksignallevel,up/downlink)
-Interference(TSdisturbance,up/downlink)
-Powerbudget(max.TXpowerinBTSandMS)
-Distance(distance>35km)
ThesevaluesaremeasuredbyBTSsandMSsandthemeasurementdataisstoredintheBSC.TheBSCisresponsibleformakingthehandoverdecisions,whichcanbefollowing:
Intra-BSCintra-cell
-betweentwotimeslotsinthesamecarrierortwocarrierinthesameBTS
Intra-BSCinter-cell
-betweentwocarriersindifferentBTS's
Inter-BSC
-betweentwoBTSsindifferentBSCs
Fig.3.2HandovermanagementintheBSC
Frequencyhoppingmanagement
FrequencyhoppingimprovesBTS-MSlinkquality.TherearethreedifferentpossibilitiesforFrequencyhopping:
Nofrequencyhopping,BasebandfrequencyandSynthesizerhopping.
Nofrequencyhopping
-IntheBTS,BBM-PartofTRX1ispermanentlyconnectedtoRF-PartofTRX1.BBM-PartofTRX2ispermanentlyconnectedtoRF-PartofTRX2.ThefrequenciesofTRX´sarefixed.
Fig.3.3BTSwithoutfrequencyhopping
Basebandhopping
Thedigital(baseband)andanalogue(RF)partsofaTRXareseparatedfromeachother.
ABusisusedtoconnectandcross-switchthebasebandandradiopartsofthetransceivers.
Basebandhoppingsequencecanbe:
-Cyclic:
TSxofTDMAframenfromBBM-Part1isconnectedtoRFPart1.TSxofTDMAframen+1fromBBM-Part1isconnectedtoRFPart2endsoon.
-Pseudo-random:
sequenceisaccordingtoanalgorithminGSMspecifications.
Fig.3.4BasebandhoppingmanagementintheBSS
SynthesizedFrequencyHopping
SynthesizedfrequencyhoppingenableseachotherTRXtochangethefrequencyoftheRF-PartonsuccessiveTime-slots.
Hoppingsequencecanbe:
-Cyclic:
BBM-PartofTRX1ispermanentlyconnectedtoRFPartofTRX1.ThefrequencyoftheRF-Partwillchangebetweenanumberoffrequencies.
-Pseudo-random:
sequenceisaccordingtoanalgorithminGSMspecifications.
Fig.3.5SynthesizedhoppingmanagementintheBSS
SignallingbetweenMSCandBSC
∙Commonchannelsignalling(CCS7)isusedbetweenMSCandBSC.
∙TheAS7-UPIUintheBCSUcartridgeoftheBSCprovidesMessageTransferPartfunctions;MTP(inMSCtheAS7-UPIUinBSUcartridgeisused).
∙TheprotocolMTProutesthesignallingmessageaccordingtothedestinationpointcode(OSIlayer1,2andlowerpartoflayer3).
∙OntopoftheMTPthereisaSignallingConnectionControlPart,SCCPtodirectthemessagetotherightuserpart.
TheuserpartprotocolwhichisusedbetweenMSCandBSSis“BSSApplicationpart,BSSAP”.BSSAPisdividedintotwosub-layers:
∙DirectTransferApplicationPart,DTAP:
whichisusedfordirectcommunicationbetweentheMSCandtheMS
∙BSSManagementApplicationPart,BSSMAP:
whichisusedforcommunicationbetweenMSCandtheBSC.
Fig.3.6CCS7managementintheBSC
SignallingbetweenBSCandBTS
LAPDsignallingisusedbetweentheBSCandtheBTS:
∙TRXSIG:
isusedforcarryingsignallinginformationbetweenBSCandBTSaswellasbetweenBSCandMS
∙BCFSIGisusedforcarryingO&MinformationbetweenBSCandBCFAunitinBS
Fig.3.7LAPDlinkmanagementintheBSC
TerrestrialChannelManagement
ChannelmanagementinAinterface:
-managingtheTrafficchannelsandtheCCS7signallingchannels
ChannelmanagementintheAbisinterfaces:
-managingtheTrafficandLAPDsignallingchannels
Fig.3.8TerrestrialchannelmanagementintheBSC
Interfaces
A-interfacetotheMSC:
-AterinterfacetoTCSM2E
AbisinterfacetotheBTSdirection:
X.25connectiontotheOMC:
-PADinterfacetotheOMCusingOSIstack(PAD:
packageassemblydisassembly)
-filetransferforloadingprogramanddatafortheBSC/BS
-filetransferformeasurementsandobservations
Fig.3.9InterfacesintheBSS
Encryptionmanagement
-storetheencryptionparameters(Kc)
-forwardstheencryptionparameterstotheBTS(Kc)
Operation
OnelocalMMIterminalfor
-BSCparametersmodificationhandling
-BTSparametersmodificationhandling
Onelocalprinterfor
-alarmprintouts
-parameterprintouts
Maintenance
-BSCreconfiguration,faultlocalisation,SWreplacement
-BTSreconfiguration,SWhandling,alarmhandling
MeasurementandObservation
-trafficmeasurements
-signallingeventobservations
-observationofspecificmobile(tracing)
SupporttoCallControl
-queuing/priority
-circuitswitching
-ShortMessageService
-DTMFcontrolsignalsaretransparent
ExtensionStrategy
-cellsplittingorexpansion
-adding/removingBTS(s)andequipment
-adding/removingchannel(