cell selection and reselection小区选择与小区重选

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1、CellselectionandreselectionKeywordsCellselectionIdleModeCellsearchCellselection:S-criteriaInitialcellselectionStoredinformationcellselectionCellreselection:R-criteriaLegacyCellReselectionPriority-BasedCellReselectionCellSelectionWhat:lookforasuitablecellWhy:obtainaccesstoc

2、ertainservicesWhen:atpoweronreturntothecoverageafterleavingCell_DCHafteranumberoffailedRRCConnectionrequestswhenenteringIdlemodeaftercompletionofanemergencycallwhenenteringIdlemodeafteranumberoffailedcellupdateattemptsIdlemode:UEispoweredon,butdoesnothaveaconnectiontotheRa

3、dioNetworkIdlemodeServicesLimitedservice:emergencycallsonlyonaacceptablecell:TheS-criteriaarefulfilledNormalservice:publicuseonasuitablecell:ThecellbelongstotheselectedPLMN.TheS-criteriaarefulfilled.ThecellisnotapartofaforbiddenregistrationareaOperator-relatedservices:foro

4、peratorsonlyonareservedcellThepurposeofcampingonacellinIdleModeEnabletheUEtoreceiveSIEnabletheUEtoaccessthenetworkwhenitneedstoestablishanRRCconnectionEnablethePLMNtofindtheUEwhenthereisacallforit.Send“paging”messageEnabletheUEtoreceivecellbroadcastserviceHow:CellSearchPro

5、ceduresynchronizationreadsysteminformationontheBCCHtoselectaPLMNandtofindasuitablecell.*systeminformation:ismappedtooneMIBandsomeSIBsthePLMNIDisintheMIBStepsChannelContentsSlotsynchronizationP-SCHprimarysynchronizationcodeFramesynchronizationdeterminesthescramblingcodegrou

6、pS-SCHsecondarysynchronizationcodesequencesDetectingDLprimaryscramblingcodeP-CPICHReadingSystemInformationP-CCPCHsysteminformationCellSelectionProcedureInitialcellselectionprocedure:theUEdoesnotknowtheWCDMAradiofrequencychannelsCase:theUEdoesnotfindasuitablecellofthePLMNon

7、whichitwaspreviouslyregistered/doesnotfindasuitablecellinstoredinformationcellselectionproceduresearchthestrongestcellscanallWCDMARFchannelssearchforthecellwiththehighestsignallevelfindthePLMNreadsthesysteminformation(cellsearch)readsthePLMNID,determinesthePLMNtowhichthece

8、llbelongsIfthecellbelongstotheselectedPLMN,itisthesuitablecellFailtofindasuitablecelltoat