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BSSbsc

DX200BSC

DX200BSCGeneralDescription

TrainingDocument

Copyright©NokiaTelecommunicationsOy2018.Allrightsreserved.

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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（