SIST EN 300 908 V6.8.1:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); Multiplexing and multiple access on the radio path (GSM 05.02 version 6.8.1 Release 1997)
- Abstract
CRs SMG#31
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST EN 300 908 V6.8.1:2003 is the Slovenian adoption of EN 300 908 Version 6.8.1 from ETSI. It defines GSM radio-path multiplexing and multiple access: the logical channels, the physical radio resource, the burst formats, and the rules for mapping channels onto timeslots and radio frequency channels for GSM Phase 2+ systems.
What does SIST EN 300 908 V6.8.1:2003 specify?
SIST EN 300 908 V6.8.1:2003 specifies the physical channels of the GSM radio sub-system needed to support GSM logical channels. It also defines frequency hopping, TDMA frames, timeslots, bursts, and the mapping from logical channels to physical channels.
The document is organized into:
- Clause 1: references and abbreviations
- Clause 2: general introduction
- Clause 3: logical channels
- Clause 4: the physical resource
- Clause 5: physical channels and burst formats
- Clause 6: mapping of logical channels onto physical channels
- Annex A: Phase 2 mobiles in a Phase 1 infrastructure
- Annex B: multislot capability
- Annex C: change control history
| Annex | What it covers |
|---|---|
| Annex A | Phase 2 mobiles in a Phase 1 infrastructure, including downlink DTX and frequency hopping cases |
| Annex B | Multislot capability classes and the limits they place on transmit and receive timeslots |
| Annex C | Change control history |
What are the key requirements of SIST EN 300 908 V6.8.1:2003?
SIST EN 300 908 V6.8.1:2003 sets the channel structure that a GSM radio interface must support. In practice, this is what equipment vendors and network planners use to make sure mobiles and base stations can talk on the air interface in a consistent way.
Logical channels and their roles
Clause 3 divides logical channels into traffic channels and control channels, then further into speech, circuit-switched data, packet data, broadcast, common control, dedicated control, and CBCH. This matters because each service uses a different channel type and the network must allocate the right one.
Physical resource and timing
Clause 4 defines the radio frequency channel set, the cell allocation (CA), the mobile allocation (MA), and the split into uplink and downlink. It also defines the 8-timeslot TDMA frame structure, the frame number cycle, and the 26-, 51-, and 52-multiframe structures. That is the timing basis for channel assignment, paging, and packet operation.
Burst formats
Clause 5 defines the Normal burst (NB), Frequency correction burst (FB), Synchronization Burst (SB), Dummy burst, and Access burst (AB), plus the guard period. The burst format matters because it determines what each timeslot carries and how a BTS or MS shapes transmission and synchronization.
Frequency hopping
Clause 6.2 defines hopping by CA, MA, MAIO, HSN, and TDMA frame number. It also states that hopping is not permitted on the BCCH carrier C0 for timeslots supporting BCCH. For implementers, this means the broadcast carrier must stay stable while traffic carriers may hop.
Mapping of logical channels
Clause 6.3 maps circuit-switched channels across 26- and 51-multiframes, and packet channels across the 52-multiframe. It covers BCCH, PCH, RACH, AGCH, NCH, PBCCH, PCCCH, PDTCH, PACCH, PRACH, PTCCH, and the packet broadcast scheduling rules. This is the core of how paging, access, speech, and packet data are placed on the air interface.
Permitted combinations and multislot use
Clause 6.4 lists the allowed combinations on a basic physical channel and the multislot arrangements for circuit-switched and packet-switched connections. Annex B then defines multislot classes and their limits on receive, transmit, and timing separation. These rules are what a network uses when assigning multiple timeslots to one MS.
Cell access and paging behavior
Clause 6.5 defines CCCH_GROUP and PAGING_GROUP for idle mode, and PCCCH_GROUP and PAGING_GROUP for GPRS attached mode. It also gives the rules for SMSCB on CBCH and notifications on NCH. In practice, this governs which mobiles listen to which paging blocks and when they wake up.
What terms does SIST EN 300 908 V6.8.1:2003 define?
- TCH/F - Full-rate traffic channel used for circuit-switched speech or data.
- PDTCH - Packet data traffic channel used for packet-switched user data.
- FCCH - Frequency correction channel used by the mobile for frequency correction.
- SCH - Synchronization channel used for frame synchronization and BTS identity.
- BCCH - Broadcast control channel that sends general cell information.
- PBCCH - Packet broadcast control channel that carries packet access parameters and packet system information.
- CCCH - Common control channel group made up of PCH, RACH, AGCH, and NCH.
- PCCCH - Packet common control channel group made up of PPCH, PRACH, PAGCH, and PNCH.
Who uses SIST EN 300 908 V6.8.1:2003?
SIST EN 300 908 V6.8.1:2003 is used by GSM radio access engineers, BTS and MS equipment designers, network planners, test laboratories, and conformance teams. It is also relevant to quality managers and buyers who need to confirm that GSM Phase 2+ radio equipment supports the expected channel structure, paging behavior, and packet access rules.
What changed in SIST EN 300 908 V6.8.1:2003 from the previous edition?
SIST EN 300 908 V6.8.1:2003 is the Version 6.8.1 publication. Annex C records prior change-control items, including corrections and clarifications for GPRS, multislot classes, BCCH and PBCCH system information, PACCH and PRACH mapping, and a version update to 6.8.1 for publication.
Which standards are used with SIST EN 300 908 V6.8.1:2003?
- GSM01.04 - provides abbreviations and acronyms used in the document.
- GSM03.03 - defines numbering, addressing, and identification terms such as BSIC and IMSI.
- GSM04.03 - defines MS-BSS channel structures and access capabilities, including channel combinations.
- GSM04.06 - supports the bit ordering and layer 2 context used for synchronization information.
- GSM04.08 - provides layer 3 messages and many broadcast and access parameters referenced in mapping rules.
- GSM05.03 - defines channel coding used for burst payloads and synchronization fields.
- GSM05.04 - defines modulation.
- GSM05.05 - defines radio transmission and reception and the RF channel bands.
- GSM05.08 - defines radio subsystem link control, including DTX-related SID frame handling.
- GSM05.10 - defines radio subsystem synchronization and TDMA frame number handling.
- GSM03.64 - gives the overall GPRS radio interface description.
- GSM04.60 - defines GPRS RLC and MAC behavior, including resource allocation and packet channel operation.
What does the SIST EN 300 908 V6.8.1:2003 document contain?
SIST EN 300 908 V6.8.1:2003 contains the definitions, channel mapping rules, and frame structures needed to implement GSM air-interface multiplexing. It includes tables that map logical channels to physical channels, frequency-hopping rules, and packet channel scheduling rules.
It also contains figures showing the channel mapping model, frame timing, burst formats, hopping logic, and example TDMA mappings. Annex A adds implementation options for downlink DTX on Phase 1 infrastructures, while Annex B gives the multislot class table and the related timing constraints.
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Frequently Asked Questions
SIST EN 300 908 V6.8.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system (Phase 2+) (GSM); Multiplexing and multiple access on the radio path (GSM 05.02 version 6.8.1 Release 1997)". This standard covers: CRs SMG#31
CRs SMG#31
SIST EN 300 908 V6.8.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.070.50 - Global System for Mobile Communication (GSM). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 908 V6.8.1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Multiplexing and multiple access on the radio path (GSM 05.02 version 6.8.1 Release 1997)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 908 Version 6.8.1SIST EN 300 908 V6.8.1:2003en01-december-2003SIST EN 300 908 V6.8.1:2003SLOVENSKI
STANDARD
ETSIEN300908V6.8.1(2000-09)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Multiplexingandmultipleaccessontheradiopath(GSM05.02version6.8.1Release1997)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)2(GSM05.02version6.8.1Release1997)ReferenceREN/SMG-020502Q6R6KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)3(GSM05.02version6.8.1Release1997)ContentsIntellectualPropertyRights.6Foreword.61Scope.71.1References.71.2Abbreviations.72General.83Logicalchannels.83.1General.83.2Trafficchannels.83.2.1General.83.2.2Speechtrafficchannels.93.2.3Circuitswitcheddatatrafficchannels.93.2.4Packetdatatrafficchannels(PDTCH).93.3Controlchannels.93.3.1General.93.3.2Broadcastchannels.93.3.2.1Frequencycorrectionchannel(FCCH).93.3.2.2Synchronizationchannel(SCH).103.3.2.3Broadcastcontrolchannel(BCCH).103.3.2.4PacketBroadcastControlChannel(PBCCH).113.3.3Commoncontroltypechannels.113.3.3.1Commoncontroltypechannels,knownwhencombinedasacommoncontrolchannel(CCCH).113.3.3.2PacketCommoncontrolchannels(PCCCH).113.3.4Dedicatedcontrolchannels.123.3.4.1Circuitswitcheddedicatedcontrolchannels.123.3.4.2Packetdedicatedcontrolchannels.123.3.5CellBroadcastChannel(CBCH).123.4Combinationofchannels.124Thephysicalresource.124.1General.124.2Radiofrequencychannels.134.2.1Cellallocationandmobileallocation.134.2.2Downlinkanduplink.134.3TimeslotsandTDMAframes.134.3.1General.134.3.2Timeslotnumber.134.3.3TDMAframenumber.135Physicalchannels.145.1General.145.2Bursts.145.2.1General.145.2.2Typesofburstandbursttiming.145.2.3Normalburst(NB).145.2.4Frequencycorrectionburst(FB).155.2.5SynchronizationBurst(SB).155.2.6Dummyburst.165.2.7Accessburst(AB).165.2.8Guardperiod.175.3Physicalchannelsandbursts.175.4Radiofrequencychannelsequence.175.5TimeslotandTDMAframesequence.175.6Parametersforchanneldefinitionandassignment.175.6.1General.17SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)4(GSM05.02version6.8.1Release1997)5.6.2Generalparameters.175.6.3Specificparameters.186Mappingoflogicalchannelsontophysicalchannels.186.1General.186.2Mappinginfrequencyoflogicalchannelsontophysicalchannels.186.2.1General.186.2.2Parameters.186.2.3Hoppingsequencegeneration.196.2.4Specificcases.206.2.5Changeinthefrequencyallocationofabasetransceiverstation.206.3Mappingintimeoflogicalchannelsontophysicalchannels.206.3.1Mappingintimeofcircuitswitchedlogicalchannelsontophysicalchannels.206.3.1.1General.206.3.1.2Keytothemappingtableofclause7.206.3.1.3MappingofBCCHdata.216.3.1.4MappingofSIDFrames.216.3.2Mappingintimeofpacketlogicalchannelsontophysicalchannels.226.3.2.1General.226.3.2.2Mappingoftheuplinkchannels.226.3.2.2.1Mappingofuplinkpackettrafficchannel(PDTCH/U)andPACCH/U.226.3.2.2.2MappingofthePacketTimingAdvanceControlChannel(PTCCH/U).226.3.2.2.3MappingoftheuplinkPCCCHi.e.PRACH.236.3.2.3Mappingofthedownlinkchannels.236.3.2.3.1Mappingofthe(PDTCH/D)andPACCH/D.236.3.2.3.2MappingofthePTCCH/D.236.3.2.3.3MappingofthePBCCH.236.3.2.3.4MappingofthePCCCH.236.3.2.4MappingofPBCCHdata.236.4Permittedchannelcombinations.246.4.1Permittedchannelcombinationsontoabasicphysicalchannel.246.4.2Multislotconfigurations.256.4.2.1Multislotconfigurationsforcircuitswitchedconnections.256.4.2.2Multislotconfigurationsforpacketswitchedconnections.256.5Operationofchannelsandchannelcombinations.266.5.1General.266.5.2DeterminationofCCCH_GROUPandPAGING_GROUPforMSinidlemode.276.5.3Determinationofspecificpagingmultiframeandpagingblockindex.276.5.4ShortMessageServiceCellBroadcast(SMSCB).276.5.5Voicegroupandvoicebroadcastcallnotifications.286.5.6DeterminationofPCCCH_GROUPandPAGING_GROUPforMSinGPRSattachedmode.28AnnexA(normative):Phase2mobilesinaPhase1infrastructure.45A.1Scope.45A.2ImplementationoptionsforTCHchannels.45A.2.1C0fillingontheTCH.45A.2.1.1Adummyburstwith(BN61,BN62,BN86)=trainingsequencebitsofnormalbursts.45A.2.1.2Adummyburstwiththe"C0fillingtrainingsequence.45A.2.1.3Adummyburstwith(BN61,BN62,BN86)mappedfromtheTSCbitsofnormalburstsaccordingtothetable;below.45A.2.1.4PartialSIDinformation.45A.2.2Halfburstfilling.45A.2.2.1PartialSIDinformationfromanyassociatedSIDframe;or.46A.2.2.2Themixedbitsofthedummybursts(encryptedornotencrypted).46A.2.3DummyburstStealingflag.46A.2.4HalfburstFillingStealingflag.46A.2.5Allowedcombinations.46SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)5(GSM05.02version6.8.1Release1997)A.3IdleChannels.46AnnexB(normative):Multislotcapability.47B.1MSclassesformultislotcapability.47B.2Constraintsimposedbytheserviceselected.49B.3NetworkrequirementsforsupportingMSmultislotclasses.49AnnexC(informative):Changecontrolhistory.52History.53SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)6(GSM05.02version6.8.1Release1997)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeSpecialMobileGroup(SMG).Thepresentdocumentdefinesthephysicalchannelsoftheradiosub-systemrequiredtosupportthelogicalchannelsofthedigitalmobilecellularandpersonalcommunicationsystemsoperatinginthe900MHzand1800MHzband(GSM900andDCS1800).ThecontentsofthepresentdocumentaresubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillthenberepublishedbyETSIwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version6.x.ywhere:6indicatesrelease1997ofGSMPhase2+.xtheseconddigitisincrementedforchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:25August2000DateoflatestannouncementofthisEN(doa):30November2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31May2001DateofwithdrawalofanyconflictingNationalStandard(dow):31May2001SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)7(GSM05.02version6.8.1Release1997)1ScopeThepresentdocumentdefinesthephysicalchannelsoftheradiosub-systemrequiredtosupportthelogicalchannels.Itincludesadescriptionofthelogicalchannelsandthedefinitionoffrequencyhopping,TDMAframes,timeslotsandbursts.1.1ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.• ForthisRelease1997document,referencestoGSMdocumentsareforRelease1997versions(version6.x.y).[1]GSM01.04:"Digitalcellulartelecommunicationssystem(Phase2+);Abbreviationsandacronyms".[2]GSM03.03:"Digitalcellulartelecommunicationssystem(Phase2+);Numbering,addressingandidentification".[3]GSM04.03:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStation-BaseStationSystem(MS-BSS)interfaceChannelstructuresandaccesscapabilities".[4]GSM04.06:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStation-BaseStationSystem(MS-BSS)interfaceDataLink(DL)layerspecification".[5]GSM04.08:"Digitalcellulartelecommunicationssystem(Phase2+);Mobileradiointerfacelayer3specification".[6]GSM05.03:"Digitalcellulartelecommunicationssystem(Phase2+);Channelcoding".[7]GSM05.04:"Digitalcellulartelecommunicationssystem;Modulation".[8]GSM05.05:"Digitalcellulartelecommunicationssystem(Phase2+);Radiotransmissionandreception".[9]GSM05.08:"Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemlinkcontrol".[10]GSM05.10:"Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemsynchronization".[11]GSM03.64:"Digitalcellulartelecommunicationssystem(Phase2+);GeneralPacketRadioService(GPRS);OveralldescriptionoftheGPRSRadioInterface;Stage2".[12]GSM04.60:"Digitalcellulartelecommunicationssystem(Phase2+);GeneralPacketRadioService(GPRS);MobileStation(MS)-BaseStationSystem(BSSinterface;RadioLinkControl(RLC)andMediumAccessControl(MAC)LayerSpecification".1.2AbbreviationsAbbreviationsusedinthepresentdocumentarelistedinGSM01.04[1].SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)8(GSM05.02version6.8.1Release1997)2GeneralTheradiosubsystemisrequiredtosupportacertainnumberoflogicalchannelsthatcanbeseparatedintotwocategoriesasdefinedinGSM04.03:i)thetrafficchannels(TCH's);ii)thecontrolchannels.Moreinformationisgivenabouttheselogicalchannelsinclause3whichalsodefinesanumberofspecialchannelsusedbytheradiosub-system.Clause4ofthepresentdocumentdescribesthephysicalresourceavailabletotheradiosub-system,clause5definesphysicalchannelsbasedonthatresourceandclause6specifieshowthelogicalchannelsshallbemappedontophysicalchannels.Figure1depictsthisprocess.3Logicalchannels3.1GeneralThissubclausedescribesthelogicalchannelsthataresupportedbytheradiosubsystem.3.2Trafficchannels3.2.1GeneralTrafficchannels(TCH's)areintendedtocarryeitherencodedspeechoruserdataincircuitswitchedmode.Twogeneralformsoftrafficchannelaredefined:i)fullratetrafficchannel(TCH/F).Thischannelcarriesinformationatagrossrateof22,8kbit/s;ii)halfratetrafficchannel(TCH/H).Thischannelcarriesinformationatagrossrateof11,4kbit/s.Packetdatatrafficchannels(PDTCH's)areintendedtocarryuserdatainpacketswitchedmode.Forthepurposeofthepresentdocument,anyreferencetotrafficchanneldoesnotapplytoPDTCHunlessexplicitlystated.Alltrafficchannelsarebi-directionalunlessotherwisestated.Unidirectionaldownlinkfullratechannels,TCH/FD,aredefinedasthedownlinkpartofthecorrespondingTCH/F.MultiplefullratechannelscanbeallocatedtothesameMS.Thisisreferredtoasmultislotconfigurations,whichisdefinedinsubclause6.4.2.1.MultiplepacketdatatrafficchannelscanbeallocatedtothesameMS.Thisisreferredtoasmultislotpacketconfigurations,asdefinedinsubclause6.4.2.2.Thespecifictrafficchannelsavailableinthecategoriesofspeechanduserdataaredefinedinthesubclausesfollowing.SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)9(GSM05.02version6.8.1Release1997)3.2.2SpeechtrafficchannelsThefollowingtrafficchannelsaredefinedtocarryencodedspeech:i)fullratetrafficchannelforspeech(TCH/FS);ii)halfratetrafficchannelforspeech(TCH/HS).3.2.3CircuitswitcheddatatrafficchannelsThefollowingtrafficchannelsaredefinedtocarryuserdata:i)fullratetrafficchannelfor9,6kbit/suserdata(TCH/F9.6);ii)fullratetrafficchannelfor4,8kbit/suserdata(TCH/F4.8);iii)halfratetrafficchannelfor4,8kbit/suserdata(TCH/H4.8);iv)halfratetrafficchannelfor≤2,4kbit/suserdata(TCH/H2.4);v)fullratetrafficchannelfor≤2,4kbit/suserdata(TCH/F2.4);vi)fullratetrafficchannelfor14,4kbit/suserdata(TCH/F14.4).3.2.4Packetdatatrafficchannels(PDTCH)APDTCHcorrespondstotheresourceallocatedtoasingleMSononephysicalchannelforuserdatatransmission.Duetothedynamicmultiplexingontothesamephysicalchannelofdifferentlogicalchannels(seesubclause6.3.2),aPDTCHcarriesinformationataninstantaneousbitraterangingfrom0to22,8kbit/s.Allpacketdatatrafficchannelsareuni-directional,eitheruplink(PDTCH/U),foramobileoriginatedpackettransferordownlink(PDTCH/D)foramobileterminatedpackettransfer.3.3Controlchannels3.3.1GeneralControlchannelsareintendedtocarrysignallingorsynchronizationdata.Threecategoriesofcontrolchannelaredefined:broadcast,commonanddedicated.Specificchannelswithinthesecategoriesaredefinedinthesubclausesfollowing.3.3.2Broadcastchannels3.3.2.1Frequencycorrectionchannel(FCCH)Thefrequencycorrectionchannelcarriesinformationforfrequencycorrectionofthemobilestation.Itisrequiredonlyfortheoperationoftheradiosub-system.SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)10(GSM05.02version6.8.1Release1997)3.3.2.2Synchronizationchannel(SCH)Thesynchronizationchannelcarriesinformationforframesynchronizationofthemobilestationandidentificationofabasetransceiverstation.Itisrequiredonlyfortheoperationoftheradiosub-system.Specificallythesynchronizationchannelshallcontaintwoencodedparameters:a)Basetransceiverstationidentitycode(BSIC):6bits(beforechannelcoding)consistsof3bitsofPLMNcolourcodewithrange0to7and3bitsofBScolourcodewithrange0to7asdefinedinGSM03.03.b)ReducedTDMAframenumber(RFN):19bits(beforechannelcoding)=T1(11bits)range0to2047=FNdiv(26x51)T2(5bits)range0to25=FNmod26T3'(3bits)range0to4=(T3-1)div10whereT3(6bits)range0to50=FNmod51andFN=TDMAframenumberasdefinedinsubclause4.3.3.GSM04.06andGSM04.08specifytheprecisebitordering,GSM05.03thechannelcodingoftheaboveparametersandGSM05.10defineshowtheTDMAframenumbercanbecalculatedfromT1,T2,andT3'.3.3.2.3Broadcastcontrolchannel(BCCH)Thebroadcastcontrolchannelbroadcastsgeneralinformationonabasetransceiverstationperbasetransceiverstationbasis.OfthemanyparameterscontainedintheBCCH,theuseofthefollowingparameters,asdefinedinGSM04.08arereferredtoinsubclause6.5:a)CCCH_CONFwhichindicatestheorganizationofthecommoncontrolchannels:Fromthisparameter,thenumberofcommoncontrolchannels(BS_CC_CHANS)andwhetherornotCCCHorSDCCHarecombined(BS_CCCH_SDCCH_COMB=trueorfalse)arederivedasfollows:CCCH_CONFBS_CC_CHANSBS_CCCH_SDCCH_COMB0001false0011true0102false1003false1104falseb)BS_AG_BLKS_RESwhichindicatesthenumberofblocksoneachcommoncontrolchannelreservedforaccessgrantmessages:3bits(beforechannelcoding)range0to7.c)BS_PA_MFRMSwhichindicatesthenumberof51-multiframesbetweentransmissionofpagingmessagestomobilesofthesamepaginggroup:3bits(beforechannelcoding)range2to9.d)supportofGPRSTheBCCHshallindicatewhetherornotpacketswitchedtrafficissupported.IfpacketswitchedtrafficissupportedandifthePBCCHexists,thentheBCCHshallbroadcastthepositionofthepacketdatachannel(PDCH),asdefinedinsubclause6.3.2.1,carryingthePBCCH.SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)11(GSM05.02version6.8.1Release1997)3.3.2.4PacketBroadcastControlChannel(PBCCH)ThePBCCHbroadcastsparametersusedbytheMStoaccessthenetworkforpackettransmissionoperation.InadditiontothoseparametersthePBCCHreproducestheinformationtransmittedontheBCCHtoallowcircuitswitchedoperation,suchthataMSinGPRSattachedmodemonitorsthePBCCHonly,ifitexists.TheexistenceofthePBCCHinthecellisindicatedontheBCCH.IntheabsenceofPBCCH,theBCCHshallbeusedtobroadcastinformationforpacketoperation.OfthemanyparameterscontainedinthePBCCH,theuseofthefollowingparameters,asdefinedinGSM04.60arereferredtoinsubclauses6.5and6.3.2:a)BS_PBCCH_BLKS(1,.,4)indicatesthenumberofblocksallocatedtothePBCCHinthemultiframe.ThepositionofthePBCCHblocksisbasedontheorderedlistasdefinedinsubclause6.3.2.1.b)BS_PCC_CHANSindicatesthenumberofphysicalchannelscarryingPCCCHsincludingthephysicalchannelcarryingthePBCCHc)BS_PAG_BLKS_RESindicatesthenumberofblocksoneachPDCHcarryingPCCCHpermultiframewhereneitherpacketpagingnorPBCCHshouldappear.ThisnumbercorrespondsthereforetothenumberofblocksreservedforPAGCH,PNCH,PDTCHandPACCH.d)BS_PRACH_BLKSindicatesthenumberofblocksreservedinafixedwaytothePRACHchannelonanyPDCHcarryingPCCCH.ThepositionofthePRACHblocksisbasedontheorderedlistasdefinedinsubclause6.3.2.1.3.3.3Commoncontroltypechannels3.3.3.1Commoncontroltypechannels,knownwhencombinedasacommoncontrolchannel(CCCH)i)Pagingchannel(PCH):Downlinkonly,usedtopagemobiles.ii)Randomaccesschannel(RACH):Uplinkonly,usedtorequestallocationofaSDCCH.iii)Accessgrantchannel(AGCH):Downlinkonly,usedtoallocateaSDCCHordirectlyaTCH.iv)Notificationchannel(NCH):Downlinkonly,usedtonotifymobilestationsofvoicegroupandvoicebroadcastcalls.3.3.3.2PacketCommoncontrolchannels(PCCCH)i)PacketPagingchannel(PPCH):Downlinkonly,usedtopageMS.ii)PacketRandomaccesschannel(PRACH):Uplinkonly,usedtorequestallocationofoneorseveralPDTCHs(foruplinkordownlinkdirection).iii)PacketAccessgrantchannel(PAGCH):Downlinkonly,usedtoallocateoneorseveralPDTCH.iv)PacketNotificationchannel(PNCH):Downlinkonly,usedtonotifyMSofPTM-Mcall.IfaPCCCHisnotallocated,theinformationforpacketswitchedoperationistransmittedontheCCCH.IfaPCCCHisallocated,itmaytransmitinformationforcircuitswitchedoperation.SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)12(GSM05.02version6.8.1Release1997)3.3.4Dedicatedcontrolchannels3.3.4.1Circuitswitcheddedicatedcontrolchannelsi)Slow,TCH/Fassociated,controlchannel(SACCH/TF).ii)Fast,TCH/Fassociated,controlchannel(FACCH/F).iii)Slow,TCH/Hassociated,controlchannel(SACCH/TH).iv)Fast,TCH/Hassociated,controlchannel(FACCH/H).v)Standalonededicatedcontrolchannel(SDCCH/8).vi)Slow,SDCCH/8associated,controlchannel(SACCH/C8)vii)Standalonededicatedcontrolchannel,combinedwithCCCH(SDCCH/4).viii)Slow,SDCCH/4associated,controlchannel(SACCH/C4).ix)slow,TCH/Fassociated,controlchannelformultislotconfigurations(SACCH/M).Allassociatedcontrolchannelshavethesamedirection(bi-directionalorunidirectional)asthechannelstheyareassociatedto.TheunidirectionalSACCH/MDisdefinedasthedownlinkpartofSACCH/M.3.3.4.2Packetdedicatedcontrolchannelsi)ThePacketAssociatedControlchannel(PACCH):ThePACCHisbi-directional.FordescriptionpurposesPACCH/UisusedfortheuplinkandPACCH/Dforthedownlink.ii)PacketTimingadvancecontrolchanneluplink(PTCCH/U):UsedtotransmitrandomaccessburststoallowestimationofthetimingadvanceforoneMSinpackettransfermode.iii)PacketTimingadvancecontrolchanneldownlink(PTCCH/D):UsedtotransmittimingadvanceupdatesforseveralMS.OnePTCCH/DispairedwithseveralPTCCH/U's.3.3.5CellBroadcastChannel(CBCH)TheCBCH,downlinkonly,isusedtocarrytheshortmessageservicecellbroadcast(SMSCB).TheCBCHusesthesamephysicalchannelastheSDCCH.3.4CombinationofchannelsOnlycertaincombinationsofchannelsareallowedasdefinedinGSM04.03.Subclause6.4liststhecombinationsinrelationtobasicphysicalchannels.4Thephysicalresource4.1GeneralThephysicalresourceavailabletotheradiosub-systemisanallocationofpartoftheradiospectrum.Thisresourceispartitionedbothinfrequencyandtime.Frequencyispartitionedbyradiofrequencychannels(RFCHs)dividedintobandsasdefinedinGSM05.05.TimeispartitionedbytimeslotsandTDMAframesasdefinedinsubclause4.3ofthepresentdocument.SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)13(GSM05.02version6.8.1Release1997)4.2Radiofrequencychannels4.2.1CellallocationandmobileallocationGSM05.05definesradiofrequencychannels(RFCHs),andallocatesnumberstoalltheradiofrequencychannelsavailabletothesystem.Eachcellisallocatedasubsetofthesechannels,definedasthecellallocation(CA).OneradiofrequencychannelofthecellallocationshallbeusedtocarrysynchronizationinformationandtheBCCH,thisshallbeknownasBCCHcarrier.Thesubsetofthecellallocation,allocatedtoaparticularmobile,shallbeknownasthemobileallocation(MA).4.2.2DownlinkanduplinkThedownlinkcomprisesradiofrequencychannelsusedinthebasetransceiverstationtoMobileStationdirection.Theuplinkcomprisesradiofrequencychannelsusedinthemobilestationtobasetransceiverstationdirection.4.3TimeslotsandTDMAframes4.3.1GeneralAtimeslotshallhaveadurationof3/5200seconds(≈577µs).EighttimeslotsshallformaTDMAframe(≈4,62msinduration).AtthebasetransceiverstationtheTDMAframesonalloftheradiofrequencychannelsinthedownlinkshallbealigned.Thesameshallapplytotheuplink(seeGSM05.10).AtthebasetransceiverstationthestartofaTDMAframeontheuplinkisdelayedbythefixedperiodof3timeslotsfromthestartoftheTDMAframeonthedownlink(seefigure2).Atthemobilestationthisdelaywillbevariabletoallowadjustmentforsignalpropagationdelay.TheprocessofadjustingthisadvanceisknownasadaptiveframealignmentandisdetailedinGSM05.10.ThestaggeringofTDMAframesusedinthedownlinkanduplinkisinordertoallowthesametimeslotnumbertobeusedinthedownlinkanduplinkwhilstavoidingtherequirementforthemobilestationtotransmitandreceivesimultaneously.Theperiodincludestimeforadaptiveframealignment,transceivertuningandreceive/transmitswitching(seefigure4).4.3.2TimeslotnumberThetimeslotswithinaTDMAframeshallbenumberedfrom0to7andaparticulartimeslotshallbereferredtobyitstimeslotnumber(TN).4.3.3TDMAframenumberTDMAframesshallbenumberedbyaframenumber(FN).Theframenumbershallbecyclicandshallhavearangeof0toFN_MAXwhereFN_MAX=(26x51x2048)-1=2715647asdefinedinGSM05.10.TheframenumbershallbeincrementedattheendofeachTDMAframe.ThecompletecycleofTDMAframenumbersfrom0toFN_MAXisdefinedasahyperframe.Ahyperframeconsistsof2048superframeswhereasuperframeisdefinedas26x51TDMAframes.A26-multiframe,comprising26TDMAframes,isusedtosupporttrafficandassociatedcontrolchannelsanda51-multiframe,comprising51TDMAframes,isusedtosupportbroadcast,commoncontrolandstandalonededicatedcontrol(andtheirassociatedcontrol)channels.Henceasuperframemaybeconsideredas51traffic/associatedcontrolmultiframesor26broadcast/commoncontrolmultiframes.A52-multiframe,comprisingtwo26-multiframes,isusedtosupportpacketdatatrafficandcontrolchannels.TheneedforahyperframeofasubstantiallylongerperiodthanasuperframearisesfromtherequirementsoftheencryptionprocesswhichusesFNasaninputparameter.SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)14(GSM05.02version6.8.1Release1997)5Physicalchannels5.1GeneralAphysicalchannelusesacombinationoffrequencyandtimedivisionmultiplexingandisdefinedasasequenceofradiofrequencychannelsandtimeslots.Thecompletedefinitionofaparticularphysicalchannelconsistsofadescriptioninthefrequencydomain,andadescriptioninthetimedomain.Thedescriptioninthefrequencydomainisaddressedinsubclause5.4,thedescriptioninthetimedomainisaddressedinsubclause5.5.5.2Bursts5.2.1GeneralAburstisaperiodofR.Fcarrierwhichismodulatedbyadatastream.Aburstthereforerepresentsthephysicalcontentofatimeslot.5.2.2TypesofburstandbursttimingAtimeslotisdividedinto156,25bitperiods.Aparticularbitperiodwithinatimeslotisreferencedbyabitnumber(BN),withthefirstbitperiodbeingnumbered0,andthelast(1/4)bitperiodbeingnumbered156.Inthesubclausesfollowingthetransmissiontimingofaburstwithinatimeslotisdefinedintermsofbitnumber.Thebitwiththelowestbitnumberistransmittedfirst.Differenttypesofburstexistinthesystem.Onecharacteristicofaburstisitsusefulduration.Thepresentdocument,inthesubclausesfollowing,definesfourfullburstsof147bitsusefulduration,andoneshortburstof87bitsusefulduration.Theusefulpartofaburstisdefinedasbeginningfromhalfwaythroughbitnumber0.ThedefinitionoftheusefulpartofaburstneedstobeconsideredinconjunctionwiththerequirementsplacedonthephaseandamplitudecharacteristicsofaburstasspecifiedinGSM05.04and05.05.Theperiodbetweenburstsappearinginsuccessivetimeslotsistermedtheguardperiod.Subclause5.2.8detailsconstraintswhichrelatetotheguardperiod.5.2.3Normalburst(NB)BitNumber(BN)LengthoffieldContentsoffieldDefinition0-23tailbits(below)3-6058encryptedbits(e0.e57)05.0361-8626trainingsequencebits(below)87-14458encryptedbits(e58.e115)05.03145-1473tailbits(below)(148-1568,25guardperiod(bits)subclause5.2.8)-wherethe"tailbits"aredefinedasmodulatingbitswithstatesasfollows:(BN0,BN1,BN2)=(0,0,0)and(BN145,BN146,BN147)=(0,0,0)-wherethe"trainingsequencebits"aredefinedasmodulatingbitswithstatesasgiveninthefollowingtableaccordingtothetrainingsequencecode,TSC.Forbroadcastandcommoncontrolchannels,theTSCmustbeequaltotheBCC,asdefinedinGSM03.03andasdescribedinthistechnicalspecificationinsubclause3.3.2.SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)15(GSM05.02version6.8.1Release1997)TrainingTrainingsequencebitsSequence(BN61,BN62.BN86)Code(TSC)0(0,0,1,0,0,1,0,1,1,1,0,0,0,0,1,0,0,0,1,0,0,1,0,1,1,1)1(0,0,1,0,1,1,0,1,1,1,0,1,1,1,1,0,0,0,1,0,1,1,0,1,1,1)2(0,1,0,0,0,0,1,1,1,0,1,1,1,0,1,0,0,1,0,0,0,0,1,1,1,0)3(0,1,0,0,0,1,1,1,1,0,1,1,0,1,0,0,0,1,0,0,0,1,1,1,1,0)4(0,0,0,1,1,0,1,0,1,1,1,0,0,1,0,0,0,0,0,1,1,0,1,0,1,1)5(0,1,0,0,1,1,1,0,1,0,1,1,0,0,0,0,0,1,0,0,1,1,1,0,1,0)6(1,0,1,0,0,1,1,1,1,1,0,1,1,0,0,0,1,0,1,0,0,1,1,1,1,1)7(1,1,1,0,1,1,1,1,0,0,0,1,0,0,1,0,1,1,1,0,1,1,1,1,0,0)Undercertaincircumstancesonlyhalftheencryptedbitspresentinanormalburstwillcontaincompleteinformation.FordownlinkDTXoperationonTCH-FSandTCH-HS,whenatrafficframe(asdefinedinGSM06.31)isscheduledfortransmissionandoneofitsadjacenttrafficframesisnotscheduledfortransmission,theotherhalfoftheencryptedbitsinthenormalburstsassociatedwiththescheduledtrafficframeshallcontainpartialSIDinformationfromanyassociatedSIDframe,withtheappropriatestealingflagsBN60orBN87setto0.Inothercasesthebinarystateoftheremainingbitsisnotspecified.5.2.4Frequencycorrectionburst(FB)BitNumberlengthContentsDefinition(BN)offieldoffield0-23tailbits(below)3-144142fixedbits(below)145-1473tailbits(below)(148-1568,25guardperiod(bits)subclause5.2.8)-wherethe"tailbits"aredefinedasmodulatingbitswithstatesasfollows:(BN0,BN1,BN2)=(0,0,0)and(BN145,BN146,BN147)=(0,0,0)-wherethe"fixedbits"aredefinedasmodulatingbitswithstatesasfollows:(BN3,BN4.BN144)=(0,0.0)NOTE:Thisburstisequivalenttounmodulatedcarrierwitha+1625/24kHzfrequencyoffset,abovethenominalcarrierfrequency.5.2.5SynchronizationBurst(SB)BitNumberLengthContentsDefinition(BN)offieldoffield0-23tailbits(below)3-4139encryptedbits(e0.e38)05.0342-10564extendedtrainingsequencebits(below)106-14439encryptedbits(e39.e77)05.03145-1473tailbits(below)(148-1568,25guardperiod(bits)subclause5.2.8)-wherethe"tailbits"aredefinedasmodulatingbitswithstatesasfollows:(BN0,BN1,BN2)=(0,0,0)and(BN145,BN146,BN147)=(0,0,0)SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)16(GSM05.02version6.8.1Release1997)-wherethe"extendedtrainingsequencebits"aredefinedasmodulatingbitswithstatesasfollows:(BN42,BN43.BN105)=(1,0,1,1,1,0,0,1,0,1,1,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,1,1,1,1,0,0,1,0,1,1,0,1,0,1,0,0,0,1,0,1,0,1,1,1,0,1,1,0,0,0,0,1,1,0,1,1)5.2.6DummyburstBitNumberLengthContentsDefinition(BN)offieldoffield0-23tailbits(below)3-144142mixedbits(below)145-1473tailbits(below)(148-1568,25guardperiod(bits)subclause5.2.8)-wherethe"tailbits"aredefinedasmodulatingbitswithstatesasfollows:(BN0,BN1,BN2)=(0,0,0)and(BN145,BN146,BN147)=(0,0,0)-wherethe"mixedbits"aredefinedasmodulatingbitswithstatesasfollows:(BN3,BN4.BN144)=(1,1,1,1,1,0,1,1,0,1,1,1,0,1,1,0,0,0,0,0,1,0,1,0,0,1,0,0,1,1,1,0,0,0,0,0,1,0,0,1,0,0,0,1,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,1,1,1,0,0,0,1,0,1,1,1,0,0,0,1,0,1,1,1,0,0,0,1,0,10,1,1,1,0,1,0,0,1,0,1,0,0,0,1,1,0,0,1,1,0,0,1,1,1,0,0,1,1,1,1,0,1,0,0,1,1,1,1,1,0,0,0,1,0,0,1,0,1,1,1,1,1,0,1,0,1,0)5.2.7Accessburst(AB)BitNumberLengthContentsDefinition(BN)offieldoffield0-78extendedtailbits(below)8-4841synch.sequencebits(below)49-8436encryptedbits(e0.e35)05.0385-873tailbits(below)(88-15668,25extendedguardperiod(bits)subclause5.2.8)-wherethe"extendedtailbits"aredefinedasmodulatingbitswiththefollowingstates:(BN0,BN1,BN2.BN7)=(0,0,1,1,1,0,1,0)-wherethe"tailbits"aredefinedasmodulatingbitswiththefollowingstates:(BN85,BN86,BN87)=(0,0,0)-wherethe"sync.sequencebits"aredefinedasmodulatingbitswiththefollowingstates:(BN8,BN9.BN48)=(0,1,0,0,1,0,1,1,0,1,1,1,1,1,1,1,1,0,0,1,1,0,0,1,1,0,1,0,1,0,1,0,0,0,1,1,1,1,0,0,0)SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)17(GSM05.02version6.8.1Release1997)5.2.8GuardperiodTheguardperiodisprovidedbecauseitisrequiredfortheMSsthattransmissionbeattenuatedfortheperiodbetweenburstswiththenecessaryrampupanddownoccurringduringtheguardperiodsasdefinedinGSM05.05.Abasetransceiverstationisnotrequiredtohaveacapabilitytorampdownandupbetweenadjacentbursts,butisrequiredtohaveacapabilitytorampdownandupfornon-usedtime-slots,asdefinedinGSM05.05.Inanycasewheretheamplitudeoftransmissionisrampedupanddown,thenbyapplyinganappropriatemodulationbitstreaminterferencetootherRFchannelscanbeminimized.5.3PhysicalchannelsandburstsThedescriptionofaphysicalchannelwillbemadeintermsoftimeslotsandTDMAframesandnotintermsofbursts.Thisisbecausethereisnotaonetoonemappingbetweenaparticularphysicalchannel,andtheuseofaparticularburst.5.4RadiofrequencychannelsequenceTheradiofrequencychannelsequenceisdeterminedbyafunctionthat,inagivencell,withagivensetofgeneralparameters,(seesubclause5.6.2),withagiventimeslotnumber(TN),agivenmobileradiofrequencychannelallocation(MA)andagivenmobileallocationindexoffset(MAIO),mapstheTDMAframenumber(FN)toaradiofrequencychannel.Inagivencellthereistherefore,foraphysicalchannelassignedtoaparticularmobile,auniquecorrespondencebetweenradiofrequencychannelandTDMAframenumber.Thedetailedhoppinggenerationalgorithmisgiveninsubclause6.2.5.5TimeslotandTDMAframesequenceAgivenphysicalchannelshallalwaysusethesametimeslotnumberineveryTDMAframe.Thereforeatimeslotsequenceisdefinedby:i)atimeslotnumber(TN);andii)aTDMAframenumbersequence.ThedetaileddefinitionsofTDMAframenumbersequencesaregiveninclause7.ThephysicalchannelswheretheTDMAframenumbersequenceis0,1.FN_MAX(whereFN_MAXisdefinedinsubclause4.3.3)arecalled"basicphysicalchannels".5.6Parametersforchanneldefinitionandassignment5.6.1GeneralThissubclausedescribesthesetofparametersnecessarytodescribefullythemappingofanylogicalchannelontoaphysicalchannel.Theseparametersmaybedividedintogeneralparameters,thatarecharacteristicofaparticularbasetransceiverstation,andspecificparameters,thatarecharacteristicofagivenphysicalchannel.5.6.2GeneralparametersTheseare:i)thesetofradiofrequencychannelsusedinthecell(CA),togetherwiththeidentificationoftheBCCHcarrier;ii)theTDMAframenumber(FN),whichcanbederivedfromthereducedTDMAframenumber(RFN)whichisintheformT1,T2,T3',seesubclause3.3.2.SIST EN 300 908 V6.8.1:2003
ETSIETSIEN300908V6.8.1(2000-09)18(GSM05.02version6.8.1Release1997)Theseparametersarebroadcast(orderivedfromparametersbroadcast)intheBCCHandSCH.5.6.3SpecificparametersTheseparametersdefineaparticularphysicalchannelinabasetransceiverstation.Theyare:o)thetrainingsequenceCode(TSC);i)thetimeslotnumber(TN);ii)themobileradiofrequencychannelallocation(MA);iii)themobileallocationindexoffset(MAIO);iv)thehoppingsequencenumber(HSN);v)thetypeoflogicalchannel;vi)thesub-channelnumber(SCN).Thelasttwoparametersallowthedeterminationoftheframesequence.6Mappingoflogicalchannelsontophysicalchannels6.1GeneralThedetailedmappingoflogicalchannelsontophysicalchannelsisdefinedinthefollowingsections.Subclause6.2definesthemappingfromTDMAframenumber(FN)toradiofrequencychannel(RFCH).Subclause6.3definesthemappingofthephysicalchannelontoTDMAframenumber.Subclause6.4liststhepermittedchannelcombinationsandsubclause6.5definestheoperationofchannelsandchannelcombinations.6.2Mappinginfrequencyoflogicalchannelsontophysicalchannels6.2.1GeneralTheparametersusedinthefunctionwhichmapsTDMAframenumberontoradiofrequencychannelaredefinedinsubclause6.2.2.Thedefinitionoftheactualmappingfunction,orasitistermed,hoppingsequencegenerationisgivenins
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