GPRS基础理论知识5Word文件下载.docx
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GPRS基础理论知识5Word文件下载.docx
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Contents
1Objectives4
2AirInterfacechannels5
2.1Logicalchannels5
2.2Physicalchannel6
3Channelcoding9
3.1Codingschemesandmultipletimeslots9
3.2AirInterfacethroughput10
4GPRSchannelallocation12
5Keypoints16
6SummaryQ&
A17
References19
Abbreviations20
1Objectives
Attheendofthemoduletheparticipantwillbeableto:
∙differentiatebetweenphysicalandlogicalGPRSchannels
∙listanddescribetheGPRSAirInterfacelogicalchannelsandtheirfunctions
∙listfourdifferentcodingschemes
∙describemultipletimeslotusage
∙describebrieflytheprocessofchannelallocation
withoutreferencetonotes.
2AirInterfacechannels
Logicalchannels
GPRSintroducesseveralnewlogicalchannelstotheGSMairinterface.
∙PBCCHThePacketBroadcastControlChannelisadownlinkonlychannelforbroadcastingpacketdataspecificsysteminformationmessages.IfthePBCCHisnotallocated,thepacketdataspecificsysteminformationisbroadcastontheBCCH.
∙PCCCHThePacketCommonControlChannel(PCCCH)consistsoflogicalchannelsusedforcommoncontrolsignallingforpacketdata.
∙PRACHThePacketRandomAccessChannelisanuplinkonlychannel,whichtheMSsuseforuplinktrafficchannelreservationandforobtainingthetimingadvance.ThenormalGSMRACHcanalsobeusedforthis,incasethereisnoPCCCHallocatedinthecell.
∙PPCHThePacketPagingChannelisadownlinkonlypagingchannelusedtopagetheMSpriortodownlinkpackettransfer.ThePPCHcanbeusedforpagingofbothCS&
PSdataservices.ThenormalGSMPCHcanbeusedforGPRSincasethereisnoPCCCHallocatedinthecell.
∙PAGCHThePacketAccessGrantChannelisadownlinkonlychannelusedforresourceassignmentduringthepackettransferestablishmentphase.ThenormalGSMAGCHcanbeusedincasethereisnoPCCCHallocatedinthecell.
∙PNCHThePacketNotificationChannel(onlyinGPRSPhase2)isadownlinkonlychannelusedforthePTM-MnotificationstoagroupofMSsbeforePTM-Mpackettransfer.
∙PDTCHThePacketDataTrafficChannelisreservedfortheactualGPRSdatatransfer.APDTCHcorrespondstotheresourceallocatedtoasingleMSononephysicalchannelforuserdatatransmission.Inmultislotoperation,oneMSmayusemultiplePDTCHsinparallelforindividualpackettransfer.
∙PACCHThePacketAssociatedControlChannel(bi-directional)isasignallingchanneldedicatedforacertainMS.Thesignallinginformationcouldincludeacknowledgements,powercontrol,resourceassignmentsorreassignmentmessages.
∙PTCCHThePacketTimingadvanceControlChannelisusedinuplinkdirectionforthetransmissionofrandomaccessburststoestimatethetimingadvanceforonemobile.InthedownlinkdirectiononePTCCHisusedtotransmittimingadvanceinformationtoseveralMSs.
Figure21
GPRSlogicalchannels
Physicalchannel
TheGPRSphy
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