BSSoverview.docx
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BSSoverview.docx
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BSSoverview
GSMBSS
BSSOverview
TrainingDocument
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No.of
pages
10/TT
Editedby/Translator
24-Jun-97
MiiaSjögren
Author
13-Feb-97
HelenaItkonen
Approvedby
24-Jun-97
StephanFlick
Previousissue
(x)approved
1.OBJECTIVE
2.BSSINTHEGSMNETWORK
3.NetworkElementsoftheBSS
3.1.Transcoder,TCSM2
3.2.BaseStationController,BSC,
3.3.BaseTransceiverStation,BTS
3.4.TransmissionUnitTRU
4.INTERFACESINTHEGSMNETWORK
5.EXERCISE
1.Objective
ThismoduledescribestheBSSnetworkelements.Afterstudyingthismaterialyoushouldbeableto:
-LabeladiagramoftheelementsandinterfacesusedwithintheBSS.(exercise4.0)
2.BSSintheGSMNetwork
GSM/DCScanbefunctionallydividedintothreemainelements:
the
BaseStationSystem(BSS),
NetworkSwitchingSubsystem(NSS)
OperationandMaintenanceCentre(OMC).
Fig.1.1BSSintheGSMandDCSnetwork
ThemaintaskoftheBaseStationSystem(BSS)istoconnectthemobileusertotheNSSthroughtheradiointerface..ItcontrolsthecellularradiointerfaceandthetransmissionlinksbetweenelementsoftheBSS
TheNetworkSwitchingSubsystem(NSS)isresponsibleforsettingupconnectionsbetweenmobileusersandothertelecommunicationusers.Itmanagestheset-up,charging,andsecurityaspectsofthecall.
TheOperationandMaintenanceCentre(OMC).isusedtomanagetheGSM/DCSnetwork,gatheringalarmsandstatisticsonthenetworksperformance.Itisalsousedtocontrolthenetworkbyremotecommandssentintothenetworkelements.
3.NetworkElementsoftheBSS
Fig.2.1NetworkElementintheBSS
Transcoder,TCSM2
consideredaspartoftheBSC
normallyattheMSCsite
usedforconvertingthebitrateoftrafficchannelsbetween64and16kbit/s
speechactivitydetection
framingandsynchronisationofthevocoderblock
interfacestotheMSC/BSC
BaseStationController,BSC,
terrestrialchannelmanagement
configurationandmanagementoftrafficchannels
frequencyhoppingcontrol
paging
BTSandMSpowercontrol
idlechannelqualitymonitor
qualityandfieldstrengthcontrolforactivechannels
handovercontrol
maintenanceofBTS/BSC/TC
interfacestotheOMC/BTS/TC
BaseTransceiverStation,BTS
timingBroadcastControlChannels(BCCH)andCommonControlChannels(CCCH)
forwardingMSandBTSmeasurementstotheBSC
maintainingsynchronisationbetweentheMSandtheBTS
detectingRACHs(RandomAccessChannels)fromtheMS
rateadaptation
channelcodinganddecodingontheradiopath
interleavinganddeinterleavingontheradiopath
encryptionanddecryptionontheradiopath
performingfrequencyhopping
GMSKmodulation,demodulation,up/downconversionandpoweramplifying
transmitterRFsignalcombining
receiverRFsignalfiltering,amplifyingandmulticoupling
reportingidletrafficchannelqualitytotheBSC
interfacetotheBSC/MobileStation
TransmissionUnitTRU
providesAbisinterface
reallocatestheTrafficandsignallingchannelsintheBTS
4.InterfacesintheGSMNetwork
Fig.3.1InterfacesintheGSM/DCS1800network
Ainterface
-betweenMSCandTC
-2Mbit/sinterface(G.703)
Aterinterface
-betweenTCSMandBSC
-2Mbit/sinterface(G.703)
Abisinterface
-betweenBSCandBTS
-2Mbit/sinterface(G.703)
-structuredependsontheconnectiontypeandsignalling(64kbit/sor16kbit/s)used
Airinterface
-betweenBTSandMS
-TDMAframeforsendingsignalsintendedforvarioususersonthesameradiofrequencyindifferenttimeslots.
X.25
-betweenMSC/BSCandOMC
-twowaystoimplement
*analogueX.25betweenBSCandOMC
*digitalX.25betweenMSCandOMC
5.Exercise
Labelthisdiagramwiththenamesofeachelementindicatingtheinterfacesthatconnectthemtogether.
DocumentRevisionHistory
DATE
ISSUE
AUTHOR
SUMMARYOFCHANGES
21-Mar-96
1.0
H.Itkonen
firstrelease
13-FEB-97
1.1
H.Itkonen
addedexercise&Objectives
DistributionList
NTCCTXX0651/1.0en
BSSSOMcourseprogram
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(Documentnumber)
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