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TSC004TECHNICALSPECIFICATIONCHINAWIRELESSTELECOMMUNICATIONSTANDARDCWTSWORKINGGROUP1WG1UEPROCEDURESINIDLEMODECONTENTS1SCOPE42REFERENCES43DEFINITIONS,ABBREVIATIONSANDSYMBOLS531DEFINITIONS532ABBREVIATIONS633SYMBOLS64GENERALDESCRIPTIONOFIDLEMODE741OVERVIEW742FUNCTIONALDIVISIONBETWEENASANDNASINIDLEMODE843SERVICETYPEINIDLEMODE95PROCESSDESCRIPTIONS1151PLMNSELECTIONANDRESELECTION1152CELLSELECTIONANDRESELECTION11521CELLSELECTIONPROCEDURE115211DESCRIPTION115212CRITERIA12522IMMEDIATECELLEVALUATIONPROCEDURE135221DESCRIPTION135222CRITERIA13523CELLRESELECTIONPROCEDURE145231DESCRIPTION145232INTRAFREQUENCYCELLRESELECTIONCRITERIA145233INTERFREQUENCYCELLRESELECTIONCRITERIA145234INTERRADIOACCESSSYSTEMCELLRESELECTIONCRITERIA145235CELLRESELECTIONPARAMETERSINSYSTEMINFORMATIONBROADCASTS15524ODMAPROBINGSUBPROCESS1552411ODMAPROBINGSTATEMACHINES15525BARREDCELLSANDACCESSCONTROL17526REGIONALPROVISIONOFSERVICE1753LOCATIONREGISTRATION186BROADCASTINFORMATIONRECEIVING1961RECEPTIONOFSYSTEMINFORMATION1962CELLBROADCAST197IDLEMODEMEASUREMENTS198DISCONTINUOUSRECEPTION209MULTICASTSERVICES2091STATEDIAGRAMBETWEENTHEMULTICASTSERVICEANDDSCH20911MT_NULLSTATE21912MT_MONITORSTATE21913MT_SAVINGSTATE21914MT_ACTIVESTATE2210EXAMPLESOFPROCEDURES23101NASINITIATEDCHANGEOFSYSTEMINFORMATION23102SYSTEMINFORMATIONUPDATETONAS24103CNORIGINATEDPAGINGINIDLEMODE25104PLMNSELECTION,AUTOMATICMODE,NORMALCASE26105PLMNRESELECTION,AUTOMATICMODE27106PLMNRESELECTION,MANUALMODE28107PLMNSELECTION,AUTOMATICMODE,SELECTEDPLMNNOTFOUND29108NASCONTROLLEDCELLSELECTION291081EXECUTIONINACCESSSTRATUM291082EXECUTIONINNONACCESSSTRATUM3011HISTORY311SCOPETHEPRESENTDOCUMENTSHALLDESCRIBETHEOVERALLIDLEMODEPROCESSFORTHEUEANDTHEFUNCTIONALDIVISIONBETWEENTHENONACCESSSTRATUMANDACCESSSTRATUMINTHEUETHEUEISINIDLEMODEWHENTHECONNECTIONOFTHEUEISCLOSEDONALLLAYERS,EGTHEREISNEITHERANMMCONNECTIONNORANRRCCONNECTIONTHISDOCUMENTPRESENTSALSOEXAMPLESOFINTERLAYERPROCEDURESRELATEDTOTHEIDLEMODEPROCESSESANDDESCRIBESIDLEMODEFUNCTIONALITYOFADUALMODETDSCDMA/GSMUE2REFERENCESTHEFOLLOWINGDOCUMENTSCONTAINPROVISIONSWHICH,THROUGHREFERENCEINTHISTEXT,CONSTITUTEPROVISIONSOFTHEPRESENTDOCUMENTREFERENCESAREEITHERSPECIFICIDENTIFIEDBYDATEOFPUBLICATION,EDITIONNUMBER,VERSIONNUMBER,ETCORNONSPECIFICFORASPECIFICREFERENCE,SUBSEQUENTREVISIONSDONOTAPPLYFORANONSPECIFICREFERENCE,THELATESTVERSIONAPPLIESANONSPECIFICREFERENCETOANTSSHALLALSOBETAKENTOREFERTOLATERVERSIONSPUBLISHEDASANENWITHTHESAMENUMBER1ETSIGSMTS0322,“FUNCTIONSRELATEDTOMOBILESTATIONINIDLEMODEANDGROUPRECEIVEMODE”2CWTSTSC001“RADIOINTERFACEPROTOCOLARCHITECTURE”3CWTSTSC003“UEFUNCTIONSANDINTERLAYERPROCEDURESINCONNECTEDMODE”4CWTSTSC102“PHYSICALCHANNELSANDMAPPINGOFTRANSPORTCHANNELSONTOPHYSICALCHANNELSTDSCDMA5CWTSTSC106“PHYSICALLAYERMEASUREMENTSTDSCDMA”6CWTSTSC203“RRCPROTOCOLSPECIFICATION”3DEFINITIONS,ABBREVIATIONSANDSYMBOLS31DEFINITIONSACCEPTABLECELLTHISISACELLTHATTHEUEMAYCAMPONTOMAKEEMERGENCYCALLSITMUSTSATISFYCERTAINCONDITIONSALLOWABLEPLMNTHISISAPLMNWHICHISNOTINTHELISTOFFORBIDDENPLMNSINTHEUEAVAILABLEPLMNTHISISAPLMNWHERETHEUEHASFOUNDACELLTHATSATISFIESCERTAINCONDITIONSCAMPEDONACELLTHEUEISINIDLEMODEANDHASCOMPLETEDTHECELLSELECTION/RESELECTIONPROCESSANDHASCHOSENACELLTHEUEMONITORSSYSTEMINFORMATIONANDINMOSTCASESPAGINGINFORMATIONNOTETHATTHESERVICESMAYBELIMITED,ANDTHATTHEPLMNMAYNOTBEAWAREOFTHEEXISTENCEOFTHEUEWITHINTHECHOSENCELLDRXDISCONTINUOUSRECEPTIONDRXCYCLETHEINDIVIDUALTIMEINTERVALBETWEENREADINGINITIALPAGINGINFORMATIONFORASPECIFICUEHOMEPLMNTHISISAPLMNWHERETHEMOBILECOUNTRYCODEMCCANDMOBILENETWORKCODEMNCOFTHEPLMNIDENTITYARETHESAMEASTHEMCCANDMNCOFTHEIMSIINITIALPAGINGINFORMATIONTHISINFORMATIONINDICATESIFTHEUENEEDTOCONTINUETOREADMOREPAGINGINFORMATIONANDEVENTUALLYRECEIVEAPAGEMESSAGEINITIALPAGINGOCCASIONTHEPAGINGOCCASIONTHEUEUSEASSTARTINGPOINTFORITSDRXCYCLELOCATIONREGISTRATIONLRTHEUEREGISTERSITSPRESENCEINAREGISTRATIONAREA,FORINSTANCEREGULARLYORWHENENTERINGANEWREGISTRATIONAREALSALOCALISEDSERVICEAREAALSAISANOPERATORDEFINEDGROUPOFCELLSFORWHICHSPECIFICACCESSCONDITIONSAPPLIESTHISMAYCORRESPONDTOANAREAINWHICHTHECORENETWORKOFFERSSPECIFICSERVICESALSAMAYBEDEFINEDWITHINAPLMNORGLOBALLYTHEREFORE,ALSAMAYOFFERANONCONTIGUOUSRADIOCOVERAGELSAEXCLUSIVEACCESSCELLAUEMAYONLYCAMPONTHISCELLIFTHECELLBELONGSTOTHELSASTOWHICHTHEUSERHASSUBSCRIBEDNEVERTHELESS,IFNOOTHERCELLSAREAVAILABLE,THEUEOFNONLSAUSERSMAYORIGINATEEMERGENCYCALLSFROMTHISCELLLSAIDLOCALISEDSERVICEAREAIDENTITYLSAONLYACCESSWHENLSAONLYACCESSAPPLIESTOTHEUSER,THEUECANONLYACCESSCELLSTHATBELONGTOTHELSASTOWHICHTHEUSERHASSUBSCRIBEDOUTSIDETHECOVERAGEAREAOFTHESUBSCRIBEDLSAS,THEUEMAYCAMPONOTHERCELLSANDLIMITEDSERVICESAPPLYLSAPREFERENTIALACCESSCELLALSAPREFERENTIALACCESSCELLISACELLWHICHISPARTOFTHELSAUESOFUSERSTHATHAVESUBSCRIBEDTOALSAOFALSAPREFERENTIALACCESSCELLHAVEHIGHERPRIORITYTORESOURCESTHANNONLSAUSERSINTHESAMECELLTHEAVAILABILITYOFLSAPREFERENTIALACCESSCELLSIMPACTTHEFOLLOWINGPROCEDURESRADIORESOURCEALLOCATIONCONTROLLEDBYRANACCESSSTRATUMTHISFUNCTIONISOUTOFTHESCOPEOFTHESTANDARDSMAXIMUMDRXCYCLETHETIMEINTERVALFORTHELONGESTPOSSIBLEDRXCYCLEINACELLPAGINGOCCASIONSTHETIMEINSTANCESWHEREITISPOSSIBLETORECEIVEINITIALPAGINGINFORMATIONRADIOACCESSMODEMODEOFTHECELL,FDDORTDDRADIOACCESSSYSTEMUMTS,GSM,TDSCDMAETCREGISTEREDPLMNRPLMNTHISISTHEPLMNONWHICHTHEUEHASPERFORMEDALOCATIONREGISTRATIONSUCCESSFULLYREGISTRATIONAREAANASREGISTRATIONAREAISANAREAINWHICHTHEUEMAYROAMWITHOUTANEEDTOPERFORMLOCATIONREGISTRATION,WHICHISANASPROCEDURESELECTEDPLMNTHISISTHEPLMNTHATHASBEENSELECTEDBYTHENONACCESSSTRATUM,EITHERMANUALLYORAUTOMATICALLYSUITABLECELLTHISISACELLONWHICHANUEMAYCAMPITMUSTSATISFYCERTAINCONDITIONSNOTETHESECERTAINCONDITIONSAREFFSVISITEDPLMNOFHOMECOUNTRYTHISISAPLMN,DIFFERENTFROMTHEHOMEPLMN,WHERETHEMCCPARTOFTHEPLMNIDENTITYISTHESAMEASTHEMCCOFTHEIMSI32ABBREVIATIONSASACCESSSTRATUMBCCHBROADCASTCONTROLCHANNELCNCORENETWORKDSCHDOWNLINKSHAREDCHANNELFDDFREQUENCYDIVISIONDUPLEXGCGENERALCONTROLSAPGPRSGENERALPACKETRADIOSYSTEMGSMGLOBALSYSTEMFORMOBILEIMSIINTERNATIONALMOBILESUBSCRIBERIDENTITYMCCMOBILECOUNTRYCODEMMMOBILITYMANAGEMENTMNCMOBILENETWORKCODENASNONACCESSSTRATUMODMAOPPORTUNITYDRIVENMULTIPLEACCESSORACHODMARANDOMACCESSCHANNELPCHPAGINGCHANNELPLMNPUBLICLANDMOBILENETWORKRANRADIOACCESSNETWORKRRCRADIORESOURCECONTROLSAPSERVICEACCESSPOINTTDDTIMEDIVISIONDUPLEXTDSCDMATIMEDIVISIONSYNCHRONOUSCODEDIVISIONMULTIPLEACCESSUEUSEREQUIPMENTUERUSEREQUIPMENTWITHODMARELAYOPERATIONENABLEDUMTSUNIVERSALMOBILETELECOMMUNICATIONSSYSTEMUTRAUMTSTERRESTRIALRADIOACCESSUTRANUMTSTERRESTRIALRADIOACCESSNETWORK33SYMBOLS4GENERALDESCRIPTIONOFIDLEMODENOTETHEIDLEMODEINTDSCDMAALSOINCLUDESTHEIDLEMODEOFGSMFURTHERDETAILSAREINVITED41OVERVIEWWHENAMULTIMODEUEISSWITCHEDON,ITATTEMPTSTOMAKECONTACTWITHAPUBLICLANDMOBILENETWORKPLMNUSINGACERTAINRADIOACCESSSYSTEMTHEPARTICULARPLMNTOBECONTACTEDMAYBESELECTEDEITHERAUTOMATICALLYORMANUALLYTHEUELOOKSFORASUITABLECELLOFTHECHOSENPLMNANDCHOOSESTHATCELLTOPROVIDEAVAILABLESERVICES,ANDTUNESTOITSCONTROLCHANNELTHISCHOOSINGISKNOWNAS“CAMPINGONTHECELL“THEUEWILLTHENREGISTERITSPRESENCEINTHEREGISTRATIONAREAOFTHECHOSENCELLIFNECESSARY,BYMEANSOFALOCATIONREGISTRATIONPROCEDUREIFTHEUEFINDSAMORESUITABLECELL,ITRESELECTSONTOTHATALTERNATIVECELLOFTHESELECTEDPLMNANDCAMPSONTHATCELLIFTHENEWCELLISINADIFFERENTREGISTRATIONAREA,LOCATIONREGISTRATIONISPERFORMEDIFNECESSARY,THEUEWILLLOOKFORMORESUITABLECELLSONOTHERPLMNSATREGULARTIMEINTERVALS,WHICHISREFERREDTOASPLMNRESELECTIONPARTICULARLY,INTHEHOMECOUNTRYOFTHEUE,THEUEWILLTRYTOGETBACKTOITSHOMEPLMNIFTHEUELOSESCOVERAGEOFAPLMN,EITHERANEWPLMNISSELECTEDAUTOMATICALLYAUTOMATICMODE,ORANINDICATIONOFWHICHPLMNSAREAVAILABLEISGIVENTOTHEUSER,SOTHATAMANUALSELECTIONCANBEMADEMANUALMODEREGISTRATIONISNOTPERFORMEDBYUESONLYCAPABLEOFSERVICESTHATNEEDNOREGISTRATIONTHEPURPOSEOFCAMPINGONACELLINIDLEMODEISFOURFOLDAITENABLESTHEUETORECEIVESYSTEMINFORMATIONFROMTHEPLMNBWHENREGISTEREDANDIFTHEUEWISHESTOINITIATEACALL,ITCANDOTHISBYINITIALLYACCESSINGTHENETWORKONTHECONTROLCHANNELOFTHECELLONWHICHITISCAMPEDCIFTHEPLMNRECEIVESACALLFORTHEREGISTEREDUE,ITKNOWSINMOSTCASESTHEREGISTRATIONAREAOFTHECELLINWHICHTHEUEISCAMPEDITCANTHENSENDA“PAGING“MESSAGEFORTHEUEONCONTROLCHANNELSOFALLTHECELLSINTHEREGISTRATIONAREATHEUEWILLTHENRECEIVETHEPAGINGMESSAGEBECAUSEITISTUNEDTOTHECONTROLCHANNELOFACELLINTHATREGISTRATIONAREAANDTHEUECANRESPONDONTHATCONTROLCHANNELDITENABLESTHEUETORECEIVECELLBROADCASTMESSAGESIFTHEUEISUNABLETOFINDASUITABLECELLTOCAMPON,ORTHEUSIMISNOTINSERTED,ORIFTHELOCATIONREGISTRATIONFAILED,ITATTEMPTSTOCAMPONACELLIRRESPECTIVEOFTHEPLMNIDENTITY,ANDENTERSA“LIMITEDSERVICE“STATEINWHICHITCANONLYATTEMPTTOMAKEEMERGENCYCALLSTHEIDLEMODETASKSCANBESUBDIVIDEDINTOTHREEPROCESSESPLMNSELECTIONANDRESELECTIONCELLSELECTIONANDRESELECTIONLOCATIONREGISTRATIONTHERELATIONSHIPBETWEENTHESEPROCESSESISILLUSTRATEDINTHEFIGURE1PLMNSELCTIONANDRSLTILOCATIONREGISTRTIPLMNSAVILABLEPLMNSELCTEDLOCATIONREGISTRTIRSPONSELOCATIONREGISTRTICHANGESINDICATIONTOUSERUSERSELCTIONOFPLMNNASDEFINEDERVICARASAUTOMATIC/MANUALSELCTINCMREQUESTNASDEFINEDERVICARASRADIOMEASUREMNTCELSELCTIONANDRSLTIFIGURE1OVERALLIDLEMODEPROCESSNOTETHEPRIORITIZATIONOFRADIOACCESSSYSTEMSANDTHEIMPACTOFNASDEFINEDSERVICEAREASISFFS42FUNCTIONALDIVISIONBETWEENASANDNASINIDLEMODETABLE1PRESENTSTHEFUNCTIONALDIVISIONBETWEENUENONACCESSSTRATUMNASANDUEACCESSSTRATUMASINIDLEMODETHEPRIMARYPURPOSEOFTHISFUNCTIONALDIVISIONISTOSERVEASABASISFORTHEWORKDIVISIONBETWEENCWTSL23ANDOTHERGROUPSEXAMPLESOFDIFFERENTIDLEMODEPROCEDURESAREPRESENTEDINCHAPTER10IDLEMODEPROCESSUENONACCESSSTRATUMUEACCESSSTRATUMPLMNSELECTIONANDRESELECTIONMAINTAINALISTOFPLMNSINPRIORITYORDERREQUESTASTOSELECTACELLEITHERBELONGINGTOTHEPLMNHAVINGTHEHIGHESTPRIORITYINAUTOMATICMODEORBELONGINGTOTHEMANUALLYSELECTEDPLMNINAUTOMATICMODE,IFAPLMNWITHHIGHERPRIORITYISFOUND,REQUESTASTOSELECTACELLBELONGINGTOTHATREPORTAVAILABLEPLMNSTONASONREQUESTFROMNASORAUTONOMOUSLYPLMNCELLSELECTIONCONTROLCELLSELECTIONBYFOREXAMPLE,MAINTAININGLISTSOFFORBIDDENREGISTRATIONAREASANDALISTOFNASDEFINEDSERVICEAREASINPRIORITYORDERPERFORMMEASUREMENTSNEEDEDTOSUPPORTCELLSELECTIONDETECTANDSYNCHRONISETOABROADCASTCHANNELRECEIVEANDHANDLEBROADCASTINFORMATIONFORWARDNASSYSTEMINFORMATIONTONASSEARCHFORASUITABLECELLBELONGINGTOTHEPLMNREQUESTEDBYNASTHECELLSAREIDENTIFIEDWITHPLMNIDENTITYINTHESYSTEMINFORMATIONRESPONDTONASWHETHERSUCHCELLISFOUNDORNOTIFSUCHACELLISFOUND,THECELLISSELECTEDTOCAMPONCELLRESELECTIONCONTROLCELLRESELECTIONBYFOREXAMPLE,MAINTAININGLISTSOFFORBIDDENREGISTRATIONAREASANDALISTOFNASDEFINEDSERVICEAREASINPRIORITYORDERPERFORMMEASUREMENTSNEEDEDTOSUPPORTCELLRESELECTIONDETECTANDSYNCHRONISETOABROADCASTCHANNELRECEIVEANDHANDLEBROADCASTINFORMATIONFORWARDNASSYSTEMINFORMATIONTONASCHANGECELLIFAMORESUITABLECELLISFOUNDPERFORMODMAPROBINGINANODMARELAYNODELOCATIONREGISTRATIONREGISTERTHEUEASACTIVEAFTERPOWERONREGISTERTHEUESPRESENCEINAREGISTRATIONAREA,FORINSTANCEREGULARLYORWHENENTERINGANEWREGISTRATIONAREADEREGISTERUEWHENSHUTTINGDOWNREPORTREGISTRATIONAREAINFORMATIONTONASTABLE1FUNCTIONALDIVISIONBETWEENASANDNASINIDLEMODE43SERVICETYPEINIDLEMODETHISCHAPTERPROVIDESSOMEDEFINITIONSREGARDINGTHELEVELOFSERVICETHATMAYBEPROVIDEDBYTHERANTOANUEINIDLEMODETHEACTIONOFCAMPINGONACELLISGENERALLYPRESENTEDASMANDATORYTORECEIVESOMESERVICEFROMTHECELLTHISNOTIONOFSERVICESHOULDBEDISTINGUISHEDIN3CATEGORIES,SOTHATTHENETWORKMAYEVENTUALLYNOTPROVIDEALLKINDOFSERVICESINEVERYCELLSFORUEINIDLEMODEEMERGENCYCALLSNORMALSERVICESFORPUBLICUSEOPERATORRELATEDSERVICESLOCATIONSERVICEFURTHERMORE,THECELLSCANBECATEGORISEDACCORDINGTOSERVICESTHEYCANOFFERACCEPTABLECELLAN“ACCEPTABLECELL“ISACELLONWHICHTHEUEMAYCAMPONTOORIGINATEEMERGENCYCALLSSUCHACELLFULFILSTHEFOLLOWINGREQUIREMENTS,WHICHISTHEMINIMUMSETOFREQUIREMENTSTOINITIATEANEMERGENCYCALLINARANNETWORKTHECELLMAYORMAYNOTBELONGTOTHEALLOWABLEPLMNLISTSTOREDONTHEUSIMTHEPATHLOSSBETWEENTHEUEANDTHERADIOSITEISBELOWATHRESHOLDWHICHISSETBYTHEOPERATORTHECELLISNOTRESERVEDFOROPERATORUSEONLYHIGHPRIORITYSUITABLECELLA“HIGHPRIORITYSUITABLECELL“ISACELLONWHICHTHEUEMAYCAMPONSUCHACELLFULFILLTHEFOLLOWINGREQUIREMENTSTHECELLBELONGSTOTHESELECTEDPLMNTHEPATHLOSSBETWEENTHEUEANDTHERADIOSITEISBELOWATHRESHOLDWHICHISSETBYTHEOPERATORTHECELLISNOTBARREDORRESERVEDFOROPERATORUSEONLYTHECELLPRIORITYISPROVIDEDBYTHENETWORKONTHEBCCHLOWPRIORITYSUITABLECELLANUEMAYONLYCAMPONTHISCELLIFNOOTHERHIGHPRIORITYSUITABLECELLSAREAVAILABLETHISMAYBEUSEDASANEXAMPLEFORTHESUPPORTOFMULTILAYEREDNETWORKSBARREDCELLANUECANNOTCAMPONTHISKINDOFCELLFORSTANDARDSERVICES,BUTMAYEVENTUALLYINITIATEANEMERGENCYCALLFROMTHISCELLIFNOOTHERSUITABLECELLISAVAILABLE,EITHERLOWORHIGHPRIORITYTHISTYPEOFCELLMAYBEUSEDBYOPERATORSFORTRAFFICLOADBALANCING,ASANEXAMPLEWHETHERORNOTTHECELLISBARRED,ISPROVIDEDBYTHENETWORKONTHEBCCH“OPERATORONLY“CELLTHEAIMOFTHISTYPEOFCELLSISTOALLOWTHEOPERATORUSINGANDTESTNEWLYDEPLOYEDCELLSWITHOUTBEINGDISTURBEDBYNORMALTRAFFICUECANNOTCAMPONTHISCELL,ORINITIATEANEMERGENCYCALLFROMTHISCELL,EXCEPTFORSOMECLASSESOFUETHECLEARANCEFORACCESSINGTOINITIATEACALLWITHINSUCHACELLISPARTOFTHEINFORMATIONSTOREDONTHEUSIMWHETHERORNOTTHECELLISRESERVEDFOROPERATORUSEONLY,ISPROVIDEDBYTHENETWORKONTHEBCCHTABLE2QUICKLYSUMMARIZESALLTHEDIFFERENTCASESABOVEASWELLASTHELEVELOFSERVICEPROVIDEDBYRAN,ASSEENFROMTHEUEINIDLEMODEACCEPTABLECELLHIGHPRIORITYSUITABLECELLLOWPRIORITYSUITABLECELLBARREDCELLOPERATORONLYCELLEMERGENCYYYYYNSTANDARDNYYBACKUPNNOPERATORNYYNYTABLE2SUMMARYOFSERVICEPROVIDEDBYRAN5PROCESSDESCRIPTIONS51PLMNSELECTIONANDRESELECTIONTHENONACCESSSTRATUMSELECTSASUITABLEPLMNNORMALLY,THEUEOPERATESONITSHOMEPLMNHPLMNHOWEVER,AVISITEDPLMNVPLMNMAYBESELECTED,EG,IFTHEUELOSESCOVERAGEWITHITSHPLMNTHEREARETWOMODESFORPLMNSELECTIONIAUTOMATICMODETHISMODEUTILIZESALISTOFPLMNSINPRIORITYORDERTHEHIGHESTPRIORITYPLMNTHATISAVAILABLEANDALLOWABLEISSELECTEDIIMANUALMODEHERETHEUEINDICATESWHICHPLMNSAREAVAILABLETOTHEUSERONLYWHENTHEUSERMAKESAMANUALSELECTIONDOESTHEUETRYTOOBTAINNORMALSERVICEONTHEVPLMNINTHEAUTOMATICMODE,THEUEWILLLOOKFORMORESUITABLEPLMNSREGULARLY,IFNECESSARYTHISISREFERREDTOASPLMNRESELECTIONPARTICULARLY,INTHEHOMECOUNTRYOFTHEUE,THEUEWILLTRYTOGETBACKTOITSHOMEPLMNSELECTIONOFTHERADIOACCESSSYSTEMMAYBEPARTOFTHEPLMNSELECTIONANDRESELECTIONPROCESSORITMAYBEASEPARATEPROCESSINSIDENASFFSNOTEDETAILSOFTHEPOSSIBLENASPROCESSOFTHERADIOACCESSSYSTEMSELECTIONAREOUTOFTHESCOPEOFTSGRANWG252CELLSELECTIONANDRESELECTIONTHEUESELECTSTHEMOSTSUITABLECELLANDTHERADIOACCESSMODEBASEDONIDLEMODEMEASUREMENTSANDCELLSELECTIONCRITERIATHENONACCESSSTRATUMCANCONTROLTHECELLSELECTION,FORINSTANCEINTERMSOFALISTOFFORBIDDENREGISTRATIONAREASANDALISTOFNASDEFINEDSERVICEAREASINPRIORITYORDERINADDITION,NASMAYALSOINFLUENCETHERADIOACCESSSYSTEMTOWHICHTHECELLSHOULDBELONGFORINSTANCE,NASMAYCREATEALISTOFRADIOACCESSSYSTEMSINPRIORITYORDERFFSWHENCAMPEDONACELL,THEUEREGULARLYSEARCHESABETTERCELLACCORDINGTOTHECELLRESELECTIONCRITERIAIFAMORESUITABLECELLISFOUND,THATCELLISSELECTEDTHENONACCESSSTRATUMISINFORMEDIFTHECELLSELECTIONANDRESELECTIONRESULTSINCHANGESINTHERECEIVEDSYSTEMINFORMATIONFORNORMALSERVICE,THEUEHASTOCAMPONASUITABLECELL,TUNETOTHATCELLSCONTROLCHANNELSSOTHATTHEUECANRECEIVESYSTEMINFORMATIONFROMTHEPLMNRECEIVEREGISTRATIONAREAINFORMATIONFROMTHEPLMN,EG,LOCATIONAREAANDROUTINGAREA,AND,IDENTIFYTHENASDEFINEDSERVICEAREASTOWHICHTHESERVINGCELLBELONGSOTHERASANDNASINFORMATIONIFREGISTERED,RECEIVEPAGINGANDNOTIFICATIONMESSAGESFROMTHEPLMN,AND,INITIATECALLSETUPFOROUTGOINGCALLSOROTHERACTIONSFROMTHEUE521CELLSELECTIONPROCEDURE5211DESCRIPTIONTHEPURPOSEOFTHECELLSELECTIONPROCEDUREISTOFINDTHEMOSTSUITABLECELLFORTHEUETOCAMPONASUITABLECELLMUSTFULFILALLTHEFOLLOWINGREQUIREMENTS1THECELLISPARTOFTHESELECTEDPLMN2THECELLISNOTBARREDDETAILSAREFFS3THECELLISNOTPARTOFAFORBIDDENREGISTRATIONAREADETAILSAREFFS4THECELLSELECTIONCRITERIAAREFULFILLEDSEEBELOW5THESOLSACRITERIAAREFULFILLEDFFSWHENEVERAPLMNISSELECTED,THEUESHALLATTEMPTTOFINDTHEMOSTSUITABLECELLOFTHATPLMNACCORDINGTOTHEFOLLOWINGSTEPS1CREATEACANDIDATELISTOFPOTENTIALCELLSTOCAMPONTWOPROCEDURESAREPOSSIBLEFORSEARCHINGTHEMOSTSUITABLECELLAINITIALCELLSELECTIONTHISPROCEDUREREQUIRESNOPRIORKNOWLEDGEOFWHICHRFCHANNELSARETDSCDMACARRIERSTHEUESHALLSCANALLRFCHANNELSINTHETDSCDMABANDTOFINDASUITABLECELLFROMSTRONGESTCARRIER,THEUESEARCHESFIRSTFORTHEGOLDCODEUSEDINDWPTSAFTERSYNCHRONIZATIONWITHSYSTEMTHEUEWILLREADBCCHINFORMATIONANDFROMTHEINFORMATIONTHEUEWILLFINDOUTWHICHPLMNSAREAVAILABLEIFTHEPLMNTHATNASREQUESTEDTOSEARCHFORISFOUND,THESEARCHOFTHERESTOFCARRIERSSHALLBESTOPPEDAFTERTHEUEHASFOUNDONESUITABLECELLFORTHESELECTEDPLMN,THEUESHALLCREATEACANDIDATELIST,BASEDONTHEMEASUREMENTANDBCCHINFORMATIONBSTOREDINFORMATIONCELLSELECTIONTHISPROCEDUREREQUIRESSTOREDCARRIERFREQUENCIESANDGOLDCODESINFORMATIONUSEDINDWPTSFROMPREVIOUSLYRECEIVEDMEASUREMENTCONTROLINFORMATIONELEMENTSAFTERTHEUEHASFOUNDONESUITABLECELLFORASELECTEDPLMNTHEUESHALLCREATETHECANDIDATELISTBASEDONTHENEIGHBOURCELLMEASUREMENTSANDBCCHINFORMATIONNOTESETTINGTHEPRIORITIESOFPLMNSEARCHANDSELECTIONAREFFS2READTHEFOLLOWINGINFORMATIONFROMTHESYSTEMINFORMATIONOFEACHCELLOFTHECANDIDATELISTCELLBARREDDETAILSAREFFSREGISTRATIONAREACELLSELECTIONPARAMETERS3FOREACHCELLONTHECANDIDATELISTNOTBARREDORFORBIDDEN,CALCULATETHECELLSELECTIONVALUE,S,ANDTHEQUALITYVALUE,Q,DEFINEDBELOW4AMONGTHECELLSWITHS0CHOOSETHECELLWITHTHEHIGHESTQVALUETOCAMPONIFNOSUITABLECELLSAREFOUNDANDTHESTOREDINFORMATIONCELLSELECTIONPROCEDUREWASUSEDINSTEP1,THEINITIALCELLSELECTIONPROCEDUREISSTARTEDANDTHESTEPSAREREPEATEDIFTHEUEISUNABLETOFINDANYSUITABLECELLUSINGTHEINITIALCELLSELECTIONPROCEDURE,ITATTEMPTSTOCAMPONANYACCEPTABLECELLANDENTERS“LIMITEDSERVICESTATE”NOTEINPLMNSELECTION,AUTOMATICMODE,THISWOULDNORMALLYRESULTINANEWPLMNSELECTION5212CRITERIATHECELLSELECTIONVALUE,S,ISDEFINEDASFOLLOWSSMINMS_TXPWR_MAX,P_MAXNET_RF_OUTPUTQQMINSCELLSELECTIONVALUE,DBQQUALITYVALUETHEQUALITYOFTHERECEIVEDSIGNAL,DBORDBMNOTEEXACTUNITISFFSQMINMINIMUMREQUIREDQUALITYLEVELINTHECELLREADINSYSTEMINFORMATIONANDDEPENDENTONTHEQUANTITYTOMEASURE,DBORDBMNET_RF_OUTPUTRFOUTPUTPOWEROFTHEDWPTSREADINSYSTEMINFORMATION,DBORDBMMS_TXPWR_MAXMAXIMUMTXPOWERLEVELANUEMAYUSEWHENACCESSINGTHECELLREADINSYSTEMINFORMATION,DBMP_MAXMAXIMUMRFOUTPUTPOWEROFTHEUE,DBMTHESELECTIONOFVALUESFORNETWORKCONTROLLEDPARAMETERSCANBEOPTIMISEDBYMEANSOFDIFFERENTMETHODSTHECELLSELECTIONCRITERIONISFULFILLEDIFS0522IMMEDIATECELLEVALUATIONPROCEDURENOTECONDITIONSONTHEUSEOFTHEIMMEDIATECELLEVALUATIONPROCEDUREAREFFS5221DESCRIPTIONTHEPURPOSEOFTHEIMMEDIATECELLEVALUATIONISTOQUICKLYFINDTHEBESTCELLTRIGGERSOFIMMEDIATECELLEVALUATIONAR