SIST EN 300 911 V6.8.1:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem link control (GSM 05.08 version 6.8.1 Release 1997)
- Abstract
05.08; s31b; CR: A250; R97; 6.7.1; 6.8.0; Correction to mapping of interference levels
- 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 300 911 V6.8.1:2003 is the Slovenian adoption of ETSI EN 300 911 Version 6.8.1 for GSM Phase 2+ radio subsystem link control. It specifies how the Mobile Station (MS), Base Station System (BSS), and Mobile Switching Centre (MSC) handle handover, RF power control, radio link failure, and cell selection and re-selection in GSM and DCS 1800.
What does SIST EN 300 911 V6.8.1:2003 specify?
SIST EN 300 911 V6.8.1:2003 specifies the radio-subsystem link control procedures used by GSM and DCS 1800 networks. Unless stated otherwise, references to GSM also include DCS 1800.
The document is organized around the main control functions and the measurements that support them:
| Annex | What it covers |
|---|---|
| Annex A | Example of a basic GSM or DCS 1800 handover and RF power control algorithm |
| Annex B | Power control procedures |
| Annex C | Change Request History |
The main clauses cover general principles, handover, RF power control, radio link failure, idle mode tasks, network prerequisites, radio link measurements, control parameters, and GPRS mode tasks.
What are the key requirements of SIST EN 300 911 V6.8.1:2003?
- Clause 3 requires the MS to measure serving and surrounding cells, while the BSS measures uplink quality and interference. In practice, these measurements are what let the network decide whether to keep a call on the same cell, move it, or change power.
- Clause 4 requires RF power control in the MS and allows it optionally in the BSS. The ordered power level comes from SACCH signalling or dedicated signalling, and the MS changes level gradually. This reduces co-channel interference and keeps uplink and downlink power close to what is actually needed.
- Clause 5 defines radio link failure from decoding success on the downlink SACCH. When the counter reaches zero, the MS declares failure and the network handles the call by re-establishment or release. This gives a controlled response to bad radio conditions instead of an abrupt drop.
- Clause 6 defines idle-mode cell selection and cell re-selection. The MS searches BCCH carriers, builds received level averages, and uses criteria such as C1 and C2 to stay camped on a cell with reliable uplink and downlink access.
- Clause 7 requires BCCH carriers to be continuously transmitted and requires BSIC-based identification of surrounding cells. In practice, this supports reliable handover decisions by making neighbouring cells distinguishable even when frequencies are reused.
- Clause 8 defines the radio link measurements RXLEV and RXQUAL, plus reporting on TCH and SDCCH. It also covers discontinuous transmission (DTX), which matters because the MS and BSS still have to measure quality when not every frame is sent.
- Clause 10 extends the same ideas to GPRS with packet idle mode, packet transfer mode, RLA_P, and GPRS-specific cell re-selection and power control. This is the part to use when packet data operation must be controlled separately from circuit-switched traffic.
What terms does SIST EN 300 911 V6.8.1:2003 define?
- BCCH - Broadcast Control Channel, the carrier used by the MS to find and read cell information.
- BSIC - Base Station Identity Code, used to identify surrounding cells that may reuse the same frequency.
- RXLEV - received signal level, the measured signal strength used in handover and cell selection.
- RXQUAL - received signal quality, a quality measure related to decoding error performance.
- RLA_C - received level average for idle mode cell selection and re-selection.
- C1 - pathloss criterion used to decide whether a cell is suitable for access.
- C2 - re-selection criterion used to rank candidate cells for idle-mode movement.
Who uses SIST EN 300 911 V6.8.1:2003?
This standard is used by radio network engineers, BSS and MSC designers, handset implementers, and test laboratories. Quality managers and operators use it to check handover behaviour, RF power control, cell re-selection, and measurement reporting during network acceptance and conformance testing.
What changed in SIST EN 300 911 V6.8.1:2003 from the previous edition?
The scope describes this version as a correction to the mapping of interference levels.
Which standards are used with SIST EN 300 911 V6.8.1:2003?
The standard relies on several GSM and ETSI specifications for supporting functions:
- GSM01.04 - abbreviations and acronyms.
- GSM03.03 - numbering, addressing, and identification, including BSIC.
- GSM03.09 - handover procedures.
- GSM03.22 - idle-mode and group receive mode functions, including cell selection rules.
- GSM04.04, GSM04.06, GSM04.08 - layer 1, data link layer, and layer 3 signalling used by the measurement and control procedures.
- GSM05.02, GSM05.05, GSM05.10 - radio channel structure, transmission and reception, and synchronization.
- GSM08.08 and GSM08.58 - MSC-BSS and BSC-BTS layer 3 signalling.
- GSM06.11 - full-rate speech frame loss handling.
- GSM11.10 - MS conformity.
- GSM03.64 - GPRS radio interface description.
What does the SIST EN 300 911 V6.8.1:2003 document contain?
The document contains the procedures and parameter tables used to control GSM radio links. Tables 1, 1a, and 2 list the control parameters for cell access, re-selection, handover, and power control. The clauses define the measurement windows, averaging rules, thresholds, reporting formats, and timing rules used by the MS and BSS. Annex A and Annex B provide worked procedural guidance, while Annex C records the change request history.
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Frequently Asked Questions
SIST EN 300 911 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); Radio subsystem link control (GSM 05.08 version 6.8.1 Release 1997)". This standard covers: 05.08; s31b; CR: A250; R97; 6.7.1; 6.8.0; Correction to mapping of interference levels
05.08; s31b; CR: A250; R97; 6.7.1; 6.8.0; Correction to mapping of interference levels
SIST EN 300 911 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 300 911 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); Radio subsystem link control (GSM 05.08 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 300 911 Version 6.8.1SIST EN 300 911 V6.8.1:2003en01-december-2003SIST EN 300 911 V6.8.1:2003SLOVENSKI
STANDARD
ETSIEN300911V6.8.1(2000-10)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemlinkcontrol(GSM05.08version6.8.1Release1997)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)2(GSM05.08version6.8.1Release1997)ReferenceREN/SMG-020508Q6R6KeywordsDigitalcellulartelecommunicationssystem,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 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)3(GSM05.08version6.8.1Release1997)ContentsIntellectualPropertyRights.6Foreword.61Scope.71.1References.71.2Abbreviations.82General.83Handover.93.1Overallprocess.93.2MSmeasurementprocedure.93.3BSSmeasurementprocedure.93.4Strategy.94RFpowercontrol.104.1Overallprocess.104.2MSimplementation.104.3MSpowercontrolrange.104.4BSSimplementation.104.5BSSpowercontrolrange.104.6Strategy.114.7Timing.114.8Dedicatedchannelsusedforavoicegroupcallorvoicebroadcast.115Radiolinkfailure.115.1Criterion.115.2MSprocedure.125.3BSSprocedure.126Idlemodetasks.136.1Introduction.136.2Measurementsfornormalcellselection.136.3Measurementsforstoredlistcellselection.146.4Criteriaforcellselectionandreselection.146.5Downlinksignallingfailure.156.6MeasurementsforCellReselection.166.6.1MonitoringofreceivedsignallevelandBCCHdata.166.6.2Pathlosscriteriaandtimingsforcellre-selection.176.7ReleaseofTCHandSDCCH.176.7.1Normalcase.176.7.2Callre-establishment.186.8Abnormalcasesandemergencycalls.187Networkpre-requisites.197.1BCCHcarriers.197.2IdentificationofsurroundingBSSforhandovermeasurements.198Radiolinkmeasurements.208.1Signallevel.208.1.1General.208.1.2Physicalparameter.208.1.3Statisticalparameters.218.1.4Rangeofparameter.228.2Signalquality.228.2.1General.228.2.2Physicalparameter.228.2.3Statisticalparameters.228.2.4Rangeofparameter.22SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)4(GSM05.08version6.8.1Release1997)8.3Aspectsofdiscontinuoustransmission(DTX).238.4Measurementreporting.248.4.1MeasurementreportingfortheMSonaTCH.248.4.2MeasurementreportingfortheMSonaSDCCH.258.4.3AdditionalcellreportingrequirementsformultibandMS.258.4.4CommonaspectsfortheMSonaTCHoraSDCCH.268.4.5MeasurementreportingfortheBSS.268.4.6Extendedmeasurementreporting.268.5AbsoluteMS-BTSdistance.278.5.1General.278.5.2Physicalparameter.279Controlparameters.2810GPRSmodetasks.3010.1CellRe-selection.3010.1.1MonitoringthereceivedsignallevelandPBCCHdata.3010.1.1.1Packetidlemode.3010.1.1.2Packettransfermode.3110.1.2CellRe-selectionCriteria.3210.1.3CellRe-selectionAlgorithm.3310.1.3.1Abnormalcellreselection.3410.1.4NetworkcontrolledCellre-selection.3410.1.4.1Measurementreporting.3510.1.4.2Cellre-selectioncommand.3510.1.4.3Exceptionalcases.3610.1.5ExtendedMeasurementreporting.3610.2RFPowerControl.3710.2.1MSoutputpower.3710.2.2BTSoutputpower.3810.2.3MeasurementsatMSside.3910.2.3.1DerivingtheCvalue.3910.2.3.1.1Packetidlemode.3910.2.3.1.2Packettransfermode.4010.2.3.2DerivationofChannelQualityReport.4110.2.3.2.1Packettransfermode.4110.2.3.2.2Packetidlemode.4210.2.3.2.3Measurementreporting.4310.2.4MeasurementsatBSSside.4310.3Measurementrequirements.4310.4Controlparameters.44AnnexA(informative):DefinitionofabasicGSMorDCS1800handoverandRFpowercontrolalgorithm.46A.1Scope.46A.2Functionalrequirement.46A.3BSSpre-processingandthresholdcomparisons.47A.3.1Measurementaveragingprocess.47A.3.2Thresholdcomparisonprocess.48A.3.2.1RFpowercontrolprocess.48A.3.2.2HandoverProcess.49A.4BSSdecisionalgorithm.50A.4.1Internalintracellhandoveraccordingtoradiocriteria:(Interferenceproblems).51A.4.2Internalhandoveraccordingtoothercriteria.51A.4.3Generalconsiderations.51SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)5(GSM05.08version6.8.1Release1997)A.5Channelallocation.51A.6HandoverdecisionalgorithmintheMSC.52AnnexB(informative):PowerControlProcedures.54B.1Openloopcontrol.54B.2Closedloopcontrol.55B.3Qualitybasedcontrol.55B.4BTSpowercontrol.56B.5Example.56AnnexC(informative):ChangeRequestHistory.58History.60SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)6(GSM05.08version6.8.1Release1997)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).ThepresentdocumentspecifiestheRadiosub-systemlinkcontrolimplementedintheMobileStation(MS),BaseStationSystem(BSS)andMobileSwitchingCentre(MSC)ofthedigitalmobilecellularandpersonalcommunicationsystemsoperatinginthe900MHzand1800MHzband(GSM900andDCS1800).ThecontentsofthepresentdocumentmaybesubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillthenbere-submittedforformalapprovalproceduresbyETSIwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version6.x.ywhere:6GSMPhase2+Release1997.xtheseconddigitisincrementedforchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.;ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:29September2000DateoflatestannouncementofthisEN(doa):31December2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30June2001DateofwithdrawalofanyconflictingNationalStandard(dow):30June2001SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)7(GSM05.08version6.8.1Release1997)1ScopeThepresentdocumentspecifiestheRadiosub-systemlinkcontrolimplementedintheMobileStation(MS),BaseStationSystem(BSS)andMobileSwitchingCentre(MSC)oftheGSMandDCS1800systems.Unlessotherwisespecified,referencestoGSMalsoincludeDCS1800.1.1ReferencesThefollowingdocumentscontainprovisionswhich,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]GSM03.09:"Digitalcellulartelecommunicationssystem(Phase2+);Handoverprocedures".[4]GSM03.22:"Digitalcellulartelecommunicationssystem(Phase2+);FunctionsrelatedtoMobileStation(MS)inidlemodeandgroupreceivemode".[5]GSM04.04:"Digitalcellulartelecommunicationssystem(Phase2+);Layer1;Generalrequirements".[6]GSM04.06:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStation-BaseStationSystem(MS-BSS)interface;DataLink(DL)layerspecification".[7]GSM04.08:"Digitalcellulartelecommunicationssystem(Phase2+);Mobileradiointerfacelayer3specification".[8]GSM05.02:"Digitalcellulartelecommunicationssystem(Phase2+);Multiplexingandmultipleaccessontheradiopath".[9]GSM05.05:"Digitalcellulartelecommunicationssystem(Phase2+);Radiotransmissionandreception".[10]GSM05.10:"Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemsynchronization".[11]GSM06.11:"Digitalcellulartelecommunicationssystem;Fullratespeech;Substitutionandmutingoflostframesforfullratespeechchannels".[12]GSM08.08:"Digitalcellulartelecommunicationssystem(Phase2+);Mobile-servicesSwitchingCentre-BaseStationSystem(MSC-BSS)interface,Layer3specification".[13]GSM08.58:"Digitalcellulartelecommunicationssystem(Phase2+);BaseStationController-BaseTransceiverStation(BSC-BTS)interface;Layer3specification".SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)8(GSM05.08version6.8.1Release1997)[14]GSM11.10:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStation(MS)conformityspecification".[15]GSM03.64:"Digitalcellulartelecommunicationssystem(Phase2+);GeneralPacketRadioService(GPRS);OveralldescriptionoftheGPRSRadioInterface;Stage2".1.2AbbreviationsAbbreviationsusedinthepresentdocumentarelistedinGSM01.04.2GeneralTheradiosub-systemlinkcontrolaspectsthatareaddressedareasfollows:-Handover;-RFPowercontrol;-RadiolinkFailure;-Cellselectionandre-selectioninIdlemode,inGroupReceivemodeandinGPRSmode(seeGSM03.22).HandoverisrequiredtomaintainacallinprogressasaMSengagedinapoint-to-pointcallorwithaccesstotheuplinkofachannelusedforavoicegroupcallpassesfromonecellcoverageareatoanotherandmayalsobeemployedtomeetnetworkmanagementrequirements,e.g.reliefofcongestion.HandovermayoccurduringacallfromoneTCHormultipleTCHs(inthecaseofmultislotconfiguration)toanotherTCHormultipleTCHs.ItmayalsooccurfromDCCHtoDCCHorfromDCCHtooneormultipleTCH(s),e.g.duringtheinitialsignallingperiodatcallset-up.Thehandovermaybeeitherfromchannel(s)ononecelltootherchannel(s)onasurroundingcell,orbetweenchannelsonthesamecellwhicharecarriedonthesamefrequencyband.Examplesaregivenofhandoverstrategies,however,thesewillbedeterminedindetailbythenetworkoperator.ForamultibandMS,specifiedinGSM02.06,thehandoverdescribedisalsoallowedbetweenanychannelsondifferentcellswhicharecarriedondifferentfrequencybands,e.g.betweenaGSM900/TCHandaDCS1800/TCH.Handoverbetweentwoco-locatedcells,carriedondifferentfrequencybands,isconsideredasinter-cellhandoverirrespectiveofthehandoverproceduresused.AdaptivecontroloftheRFtransmitpowerfromanMSandoptionallyfromtheBSSisimplementedinordertooptimizetheuplinkanddownlinkperformanceandminimizetheeffectsofco-channelinterferenceinthesystem.Thecriteriafordeterminingradiolinkfailurearespecifiedinordertoensurethatcallswhichfaileitherfromlossofradiocoverageorunacceptableinterferencearesatisfactorilyhandledbythenetwork.Radiolinkfailuremayresultineitherre-establishmentorreleaseofthecallinprogress.Forchannelsusedforavoicegroupcall,anradiouplinkfailureresultsinthefreeingupoftheuplink.Proceduresforcellselectionandre-selectionwhilstinIdlemode(i.e.notactivelyprocessingacall),arespecifiedinordertoensurethatamobileiscampedonacellwithwhichitcanreliablycommunicateonboththeradiouplinkanddownlink.TheoperationsofanMSinIdleModearespecifiedinGSM03.22.Cellre-selectionisalsoperformedbytheMSwhenattachedtoGPRS,exceptwhentheMSsimultaneouslyhasacircuitswitchedconnection.Optionalproceduresarealsospecifiedfornetworkcontrolledcellre-selectionforGPRS.Cellre-selectionforGPRSisdefinedinsubclause10.1.AnMSlisteningtoavoicegroupcalloravoicebroadcastusecellre-selectionprocedurestochangecell.Thismaybesupportedbyalistofcellscarryingthevoicegrouporvoicebroadcastcalldownlink,providedtotheMSbythenetwork.TheoperationsofanMSinGroupReceiveModearespecifiedinGSM03.22.InformationsignalledbetweentheMSandBSSissummarizedintables1,2and3.AfullspecificationoftheLayer1headerisgiveninGSM04.04,andoftheLayer3fieldsinGSM04.08.SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)9(GSM05.08version6.8.1Release1997)3Handover3.1OverallprocessTheoverallhandoverprocessisimplementedintheMS,BSSandMSC.Measurementofradiosubsystemdownlinkperformanceandsignallevelsreceivedfromsurroundingcells,ismadeintheMS.ThesemeasurementsaresignalledtotheBSSforassessment.TheBSSmeasurestheuplinkperformancefortheMSbeingservedandalsoassessesthesignallevelofinterferenceonitsidletrafficchannels.InitialassessmentofthemeasurementsinconjunctionwithdefinedthresholdsandhandoverstrategymaybeperformedintheBSS.AssessmentrequiringmeasurementresultsfromotherBTSorotherinformationresidentintheMSC,maybeperformedintheMSC.GSM03.09describesthehandoverprocedurestobeusedinPLMNs.3.2MSmeasurementprocedureAprocedureshallbeimplementedintheMSbywhichitmonitorsthedownlinkRXsignallevelandqualityfromitsservingcellandthedownlinkRXsignallevelandBSICofsurroundingBTS.ThemethodofidentificationofsurroundingBTSisdescribedinsubclause7.2.TherequirementsfortheMSmeasurementsaregiveninsubclause8.1.3.3BSSmeasurementprocedureAprocedureshallbeimplementedintheBSSbywhichitmonitorstheuplinkRXsignallevelandqualityfromeachMSbeingservedbythecell.Inthecaseofamultislotconfigurationtheevaluationshallbeperformedonatimeslotpertimeslotbasis.AprocedureshallbeimplementedbywhichtheBSSmonitorsthelevelsofinterferenceonitsidletrafficchannels.3.4StrategyThehandoverstrategyemployedbythenetworkforradiolinkcontroldeterminesthehandoverdecisionthatwillbemadebasedonthemeasurementresultsreportedbytheMS/BSSandvariousparameterssetforeachcell.Networkdirectedhandovermayalsooccurforreasonsotherthanradiolinkcontrol,e.g.tocontroltrafficdistributionbetweencells.Theexacthandoverstrategieswillbedeterminedbythenetworkoperator,adetailedexampleofabasicoverallalgorithmappearsinannexA.Possibletypesofhandoverareasfollows:Inter-cellhandover:IntercellhandoverfromtheservingcelltoasurroundingcellwillnormallyoccureitherwhenthehandovermeasurementsshowlowRXLEVand/orRXQUALonthecurrentservingcellandabetterRXLEVavailablefromasurroundingcell,orwhenasurroundingcellallowscommunicationwithalowerTXpowerlevel.ThistypicallyindicatesthatanMSisontheborderofthecellarea.IntercellhandovermayalsooccurfromtheDCCHontheservingcelltoaTCHormultislotconfigurationonanothercellduringcallestablishment.ThismaybeusedasameansofprovidingsuccessfulcallestablishmentwhennoTCHresourceisavailableonthecurrentservingcell.Inter-cellhandoverbetweencellsusingdifferentfrequencybandsisallowedforamultibandMS.Intra-cellhandover:Intra-cellhandoverfromonechannel/timeslotintheservingcelltoanotherchannel/timeslotinthesamecellwillnormallybeperformedifthehandovermeasurementsshowalowRXQUAL,butahighRXLEVontheservingcell.ThisindicatesadegradationofqualitycausedbyinterferenceeventhoughtheMSissituatedwithintheservingcell.Theintra-cellhandovershouldprovideachannelwithalowerlevelofinterference.Intra-cellhandovercanoccureithertoatimeslotonanewcarrierortoadifferenttimeslotonthesamecarrier.Similarly,intra-cellhandovermayoccurbetweendifferentmultislotconfigurationsinthesamecell.Thesemultislotconfigurationsmaycomprisedifferentnumberoftimeslotsandmaypartlyoverlap.Intra-cellhandoverfromoneofthebandsofoperationtoanotheroneisallowedforamultibandMS.GSM08.08definesthecausesforhandoverthatmaybesignalledfromBSStoMSC.SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)10(GSM05.08version6.8.1Release1997)4RFpowercontrol4.1OverallprocessRFpowercontrolisemployedtominimizethetransmitpowerrequiredbyMSorBSSwhilstmaintainingthequalityoftheradiolinks.Byminimizingthetransmitpowerlevels,interferencetoco-channelusersisreduced.4.2MSimplementationRFpowercontrolshallbeimplementedintheMS.ThepowercontrolleveltobeemployedbytheMSoneachuplinkchannel,exceptPDCH,isindicatedbymeansofthepowercontrolinformationsenteitherinthelayer1headerofeachSACCHmessageblock(seeGSM04.04)onthecorrespondingdownlinkchannel,orinadedicatedsignallingblock(seeGSM04.08).PowercontrolforPDCHisdefinedinsubclause10.2.TheMSshallemploythemostrecentlycommandedpowercontrollevelappropriatetoeachchannelforalltransmittedburstsoneitheraTCH(includinghandoveraccessburst),FACCH,SACCHorSDCCH.TheMSshallconfirmthepowercontrollevelthatitiscurrentlyemployingintheSACCHL1headeroneachuplinkchannel.TheindicatedvalueshallbethepowercontrollevelactuallyusedbythemobileforthelastburstofthepreviousSACCHperiod.Incaseofamultislotconfiguration,eachbi-directionalchannelshallbepowercontrolledindividuallybythecorrespondingSACCH.Powercontrolinformationondownlinkunidirectionalchannelsshallbeneglected.WhenaccessingacellontheRACH(randomaccess)andbeforereceivingthefirstpowercommandduringacommunicationonaDCCHorTCH(afteranIMMEDIATEASSIGNMENT),allGSMandclass1andclass2DCS1800MSshallusethepowerleveldefinedbytheMS_TXPWR_MAX_CCHparameterbroadcastontheBCCHofthecell.Theclass3DCS1800MSshallusethepowerleveldefinedbyMSTXPWRMAXCCHplusthevaluePOWEROFFSETalsobroadcastontheBCCHofthecell.IfapowercontrolleveldefinedinGSM05.05isreceivedbutthelevelisnotsupportedbytheMS,theMSshallusethesupportedoutputpowerwhichisclosesttotheoutputpowerindicatedbythereceivedpowercontrollevel.4.3MSpowercontrolrangeTherangeoverwhichaMSshallbecapableofvaryingitsRFoutputpowershallbefromitsmaximumoutputdowntoitsminimum,instepsofnominally2dB.GSM05.05givesadetaileddefinitionoftheRFpowerlevelstepsizeandtolerances.4.4BSSimplementationRFpowercontrolmayoptionallybeimplementedintheBSS.4.5BSSpowercontrolrangeTherangeoverwhichtheBSSshallbecapableofreducingitsRFoutputpowerfromitsmaximumlevelshallbenominally30dB,in15stepsofnominally2dB.GSM05.05givesadetaileddefinitionoftheRFpowerlevelstepsizeandtolerances.SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)11(GSM05.08version6.8.1Release1997)4.6StrategyTheRFpowercontrolstrategyemployedbythenetworkdeterminestheorderedpowerlevelthatissignalledtotheMS,andthepowerlevelthatisemployedbytheBSS.ThepowerleveltobeemployedineachcasewillbebasedonthemeasurementresultsreportedbytheMS/BTSandvariousparameterssetforeachcell.Theexactstrategieswillbedeterminedbythenetworkoperator.AdetailedexampleofabasicalgorithmappearsinannexA.4.7TimingUponreceiptofacommandfromanSACCHtochangeitspowerlevelonthecorrespondinguplinkchannel,theMSshallchangetothenewlevelatarateofonenominal2dBpowercontrolstepevery60ms(13TDMAframes),i.e.arangechangeof15stepsshouldtakeabout900ms.ThechangeshallcommenceatthefirstTDMAframebelongingtothenextreportingperiod(asspecifiedinsubclause8.4).TheMSshallchangethepoweronenominal2dBstepatatime,atarateofonestepevery60msfollowingtheinitialchange,irrespectiveofwhetheractualtransmissiontakesplaceornot.Incaseofchannelchange,exceptformultislotconfigurationchange,thecommandedpowercontrollevelshallbeappliedoneachnewchannelimmediately.ThemultislotconfigurationchangemessagedoesnotcommandtheMStousenewpowercontrollevels.ForthosetimeslotsnotusedbytheMSbeforethemultislotconfigurationchangeprocedure,theMSshallusethepowercontrollevelusedonthemainchannelbeforethemultislotconfigurationchange.4.8DedicatedchannelsusedforavoicegroupcallorvoicebroadcastThenetworkshallnotallocatetheuplinkofthechannelusedforavoicegroupcalltomorethanoneMS.Ifmarkedbusy,nootherMSshalltransmitonthechannel.Thismarkingisindicatedbythenetwork,asdefinedinGSM03.68and04.08.AnyMSallocatedtheuplinkofachannelusedforavoicegroupcallshallonlytransmitiftheuplinkismarkedbusy,andshallstopusingtheuplinkifithappenstobecomemarkedfree.AnMSnotallocatedtheuplinkmayperformarandomaccessprocedureontheuplinktogainaccesstotalk,onlyiftheuplinkismarkedasfree.Onachannelusedduringavoicegroupcall,theuplinkpowercontrolshallonlyapplytotheMScurrentlyallocatedthatuplink,andtheMSpowercontrollevelorderedbythenetworkshallbeignoredbyallotherMSslisteningtothedownlink.Whenperformingarandomaccessonacelltogainaccesstotheuplinkofachannelusedforavoicegroupcall,untilreceivingthefirstdedicatedpowercommandfromthenetwork,theMSshallusethelastreceivedpowerlevelcommandasdefinedbytheMS_TXPWR_MAX_CCHparameterbroadcastontheBCCHofthecell,orifMS_TXPWR_MAX_CCHcorrespondstoapowercontrollevelnotsupportedbytheMSasdefinedbyitspowerclassinGSM05.05,theMSshallactasthoughtheclosestsupportedpowercontrollevelhadbeenbroadcast.RFdownlinkpowercontrolwillnormallynotbeappliedonchannelsusedforavoicegroupcallorvoicebroadcast.5Radiolinkfailure5.1CriterionThecriterionfordeterminingRadioLinkFailureintheMSshallbebasedonthesuccessrateofdecodingmessagesonthedownlinkSACCH.Foracircuitswitchedmultislotconfiguration,onlythemainSACCHshallbeusedfordeterminingRadioLinkFailure.ForGPRS,RadioLinkFailureisdeterminedbytheRLC/MACprotocol(seeGSM04.60).SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)12(GSM05.08version6.8.1Release1997)5.2MSprocedureTheaimofdeterminingradiolinkfailureintheMSistoensurethatcallswithunacceptablevoice/dataquality,whichcannotbeimprovedeitherbyRFpowercontrolorhandover,areeitherre-establishedorreleasedinadefinedmanner.Ingeneraltheparametersthatcontroltheforcedreleaseshouldbesetsuchthattheforcedreleasewillnotnormallyoccuruntilthecallhasdegradedtoaqualitybelowthatatwhichthemajorityofsubscriberswouldhavemanuallyreleased.Thisensuresthat,forexample,acallontheedgeofaradiocoveragearea,althoughofbadquality,canusuallybecompletedifthesubscriberwishes.TheradiolinkfailurecriterionisbasedontheradiolinkcounterS.IftheMSisunabletodecodeaSACCHmessage(BFI=1),Sisdecreasedby1.InthecaseofasuccessfulreceptionofaSACCHmessage(BFI=0)Sisincreasedby2.InanycaseSshallnotexceedthevalueofRADIO_LINK_TIMEOUT.IfSreaches0aradiolinkfailureshallbedeclared.TheactiontobetakenisspecifiedinGSM04.08.TheRADIO_LINK_TIMEOUTparameteristransmittedbyeachBSSintheBCCHdata(seetable1).TheMSshallcontinuetransmittingasnormalontheuplinkuntilSreaches0.ThealgorithmshallstartaftertheassignmentofadedicatedchannelandSshallbeinitializedtoRADIO_LINK_TIMEOUT.Thedetailedoperationshallbeasfollows:-Theradiolinktime-outalgorithmshallbestoppedatthereceptionofachannelchangecommand.-(Re-)initializationandstartofthealgorithmshallbedonewhenevertheMSswitchestoanewchannel(thisincludestheoldchannelinassignmentandhandoverfailurecases),atthelatestwhenthemainsignallinglink(seeGSM04.08)hasbeenestablished.-TheRADIO_LINK_TIMEOUTvalueusedat(re-)initializationshallbethatusedonthepreviouschannel(intheImmediateAssignmentcasethevaluereceivedontheBCCH),orthevaluereceivedonSACCHiftheMShasreceivedaRADIO_LINK_TIMEOUTvalueonthenewchannelbeforetheinitialization.-IfthefirstRADIO_LINK_TIMEOUTvalueontheSACCHisreceivedonthenewchannelaftertheinitialization,thecountershallbere-initializedwiththenewvalue.AnMSlisteningtoavoicegroupcalloravoicebroadcast,uponadownlinkradiolinkfailureshallreturntoidlemodeandperformcellre-selection.5.3BSSprocedureThecriteriafordeterminingradiolinkfailureintheBSSshouldbebaseduponeithertheerrorrateontheuplinkSACCH(s)oronRXLEV/RXQUALmeasurementsoftheMS.Theexactcriteriatobeemployedshallbedeterminedbythenetworkoperator.Forchannelsusedforavoicegroupcall,theradiolinkfailureproceduresintheBSSshallberesetuponthere-allocationoftheuplinktoanotherMS.Uponauplinkradiofailure,thenetworkshallmarkitasfree,seesubclause4.8.Whenevertheuplinkisnotused,andforchannelsusedforvoicebroadcast,theBSSradiolinkfailureproceduresshallnotapplyonthatchannel.SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)13(GSM05.08version6.8.1Release1997)6Idlemodetasks6.1IntroductionWhilstinidlemode,anMSshallimplementthecellselectionandre-selectionproceduresdescribedinGSM03.22.Theseproceduresmakeuseofmeasurementsandsub-proceduresdescribedinthisclause.TheproceduresensurethattheMSiscampedonacellfromwhichitcanreliablydecodedownlinkdataandwithwhichithasahighprobabilityofcommunicationsontheuplink.OncetheMSiscampedonacell,accesstothenetworkisallowed.ThisclausemakesuseoftermsdefinedinGSM03.22.TheMSshallnotusethediscontinuousreception(DRX)modeofoperation(i.e.poweringitselfdownwhenitisnotexpectingpagingmessagesfromthenetwork)whileperformingthecellselectionalgorithmdefinedinGSM03.22.Howeveruseofpoweringdownispermittedatallothertimesinidlemode.Forthepurposeofcellselectionandreselection,theMSshallbecapableofdetectingandsynchronizingtoaBCCHcarrierandreadtheBCCHdataatreferencesensitivitylevelandreferenceinterferencelevelsasspecifiedinGSM05.05.AnMSinidlemodeshallalwaysfulfiltheperformancerequirementspecifiedinGSM05.05atlevelsdowntoreferencesensitivitylevelorreferenceinterferencelevel.Theallowederrorrates(seeGSM05.05)mightimpactthecellselectionandreselectionprocedure,e.g.triggercellreselection.Moreover,oneconsequenceoftheallowederrorratesisthatinthecaseofnofrequencyhoppingandaTU3(TU1.5forDCS1800)propagationprofileitcannotbeexpectedthatanMSwillrespondtopagingunlessthereceivedsignallevelis2dBhigherthanthespecifiedreferencelevel.Forthepurposesofcellselectionandreselection,theMSisrequiredtomaintainanaverageofreceivedsignallevelsforallmonitoredfrequencies.Thesequantitiestermedthe"receivedlevelaverages"(RLA_C),shallbeunweightedaveragesofthereceivedsignallevelsmeasuredindBm.Theaccuracyofthereceivedsignallevelmeasurementsforidlemodetasksshallbethesameasforradiolinkmeasurements(seesubclause8.1.2).Thetimesgiveninsubclauses6.2,6.3and6.6refertointernalprocessesintheMSrequiredtoensurethattheMScampsasquicklyaspossibletothemostappropriatecell.Forthecellselection,theMSshallbeabletoselectthecorrect(fourthstrongest)cellandbeabletorespondtopagingonthatcellwithin30secondsofswitchon,whenthethreestrongestcellsarenotsuitable.ThisassumesavalidSIMwithPINdisabledandidealradioconditions.Thetoleranceonallthetimingrequirementsinclause6is±10%,exceptforPENALTY_TIMEwhereitis±2s.6.2MeasurementsfornormalcellselectionThemeasurementsofthisclauseshallbeperformedbyanMSwhichhasnopriorknowledgeofwhichGSMorDCS1800RFchannelsareBCCHcarriers.TheMSshallsearchallRFchannelsinthesystem(124forP-GSM,174forE-GSM,194forR-GSM,and374forDCS1800),takereadingsofreceivedRFsignalleveloneachRFchannel,andcalculatetheRLA_Cforeach.TheaveragingisbasedonatleastfivemeasurementsamplesperRFcarrierspreadover3to5s,themeasurementsamplesfromthedifferentRFcarriersbeingspreadevenlyduringthisperiod.AmultibandMSshallsearchallchannelswithinitsbandsofoperationasspecifiedabove.Thenumberofchannelssearchedwillbethesumofchannelsoneachbandofoperation.BCCHcarrierscanbeidentifiedby,forexample,searchingforfrequencycorrectionbursts.OnfindingaBCCHcarrier,theMSshallattempttosynchronizetoitandreadtheBCCHdata.ThemaximumtimeallowedforsynchronizationtoaBCCHcarrieris0.5s,andthemaximumtimeallowedtoreadtheBCCHdata,whenbeingsynchronizedtoaBCCHcarrier,is1.9s.Anexceptionisallowedforsysteminformationmessagesthatarebroadcastonlyonceeverynth(n>1)occurrenceofthe8multiframes(seeGSM05.02).Forthesesysteminformationmessagesthealloweddecodingtimeisextendedaccordingtotheappliedschedulingofthesysteminformationbroadcast,i.e.n*1.9s.SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)14(GSM05.08version6.8.1Release1997)6.3MeasurementsforstoredlistcellselectionTheMSmayincludeoptionalstorageofBCCHcarrierinformationwhenswitchedoffasdetailedinGSM03.22.Forexample,theMSmaystoretheBCCHcarriersinusebythePLMNselectedwhenitwaslastactiveintheGSM900orDCS1800network.TheBCCHlistmayincludeBCCHcarriersfrommorethanonebandinamultibandoperationPLMN.AMSmayalsostoreBCCHcarriersformorethanonePLMNwhichithasselectedpreviously(e.g.atnationalbordersorwhenmorethanonePLMNservesacountry),inwhichcasetheBCCHcarrierlistsmustbekeptquiteseparate.ThestoredBCCHcarrierinformationusedbytheMSmaybederivedbyavarietyofdifferentmethods.TheMSmayusetheBA_RANGEinformationelement,which,iftransmittedinthechannelreleasemessage(seeGSM04.08),indicatesrangesofcarrierswhichincludetheBCCHcarriersinuseoverawideareaoreventhewholePLMN.ItshouldbenotedthattheBA(BCCH)listmightonlycontaincarriersinuseinthevicinityofthecellonwhichitwasbroadcast,andthereforemightnotbeappropriateiftheMSisswitchedoffandmovedtoanewlocation.TheBA_RANGEinformationelementcontainstheNumberofRangesparameter(definedasNR)aswellasNRsetsofparametersRANGEi_LOWERandRANGEi_HIGHER.TheMSshouldinterpretthesetomeanthatalltheBCCHcarriersofthenetworkhaveARFCNsinthefollowingranges:Range1=ARFCN(RANGE1_LOWER)toARFCN(RANGE1_HIGHER);Range2=ARFCN(RANGE2_LOWER)toARFCN(RANGE2_HIGHER);RangeNR=ARFCN(RANGENR_LOWER)toARFCN(RANGENR_HIGHER).IfRANGEi_LOWERisgreaterthanRANGEi_HIGHER,therangeshallbeconsideredcyclicandencompassescarrierswithARFCNfromrangeRANGEi_LOWERto1023andfrom0toRANGEi_HIGHER.IfRANGEi_LOWERequalsRANGEi_HIGHERthentherangeshallonlyconsistofthecarrierwhoseARFCNisRANGEi_LOWER.IfanMSincludesastoredBCCHcarrierlistoftheselectedPLMNitshallperformthesamemeasurementsasinsubclause6.2exceptthatonlytheBCCHcarriersinthelistneedtobemeasured.Ifstoredlistcellselectionisnotsuccessful,thenasdefinedinGSM03.22,normalcellselectionshalltakeplace.SinceinformationconcerninganumberofchannelsisalreadyknowntotheMS,itmayassignhighprioritytomeasurementsonthestrongestcarriersfromwhichithasnotpreviouslymadeattemptstoobtainBCCHinformation,andomitrepeatedmeasurementsontheknownones.6.4CriteriaforcellselectionandreselectionThepathlosscriterionparameterC1usedforcellselectionandreselectionisdefinedby:C1=(A-Max(B,0))whereA=RLA_C-RXLEV_ACCESS_MINB=MS_TXPWR_MAX_CCH-Pexceptfortheclass3DCS1800MSwhere:B=MS_TXPWR_MAX_CCH+POWEROFFSET-PRXLEV_ACCESS_MIN=MinimumreceivedsignallevelattheMSrequiredforaccesstothesystem.MS_TXPWR_MAX_CCH=MaximumTXpowerlevelanMSmayusewhenaccessingthesystemuntilotherwisecommanded.POWEROFFSET=ThepoweroffsettobeusedinconjunctionwiththeMSTXPWRMAXCCHparameterbytheclass3DCS1800MS.P=MaximumRFoutputpoweroftheMS.AllvaluesareexpressedindBm.Thepathlosscriterion(GSM03.22)issatisfiedifC1>0.SIST EN 300 911 V6.8.1:2003
ETSIETSIEN300911V6.8.1(2000-10)15(GSM05.08version6.8.1Release1997)ThereselectioncriterionC2isusedforcellreselectiononlyandisdefinedby:C2=C1+CELL_RESELECT_OFFSET-TEMPORARYOFFSET*H(PENALTY_TIME-T)forPENALTY_TIME<>11111C2=C1-CELL_RESELECT_OFFSETforPENALTY_TIME=11111whereFornon-servingcells:H(x)=0forx<0=1forx≥≥≥≥0Forservingcells:H(x)=0Tisatimerimplementedforeachcellinthelistofstrongestcarriers(seesubclause6.6.1).TshallbestartedfromzeroatthetimethecellisplacedbytheMSonthelistofstrongestcarriers,exceptwhenthepreviousservingcellisplacedonthelistofstrongestcarriersatcellreselection.Inthis,case,TshallbesettothevalueofPENALTY_TIME(i.e.expired).CELL_RESELECT_OFFSETappliesanoffsettotheC2reselectioncriterionforthatcell.NOTE:CELL_RESELECT_OFFSETmaybeusedtogivedifferentprioritiestodifferentbandswhenmultibandoperationisused.TEMPORARY_OFFSETappliesane
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