In this chapter we shall learn about RRC paging procedure.
RRC paging function is used to trigger RRC Request and RRC Connection Resumption.
When the UE in RRC-IDLE, UE will monitor paging channel for CN-initiated paging.
UE in RRC-INACTIVE, UE will monitor the paging channel for RAN-initiated paging.
UE needs to monitor the paging channel during the Paging Occasion (PO) per DRX cycle (TS 38.304).
-> For CN-initiated paging, the default DRX period is broadcasted in SI.
-> UE specific can be configured through NAS signalling.
-> For RAN-initiated paging, UE specific period can be configured through RRC Signalling.
RRC Paging message details:
Paging ::= SEQUENCE { pagingRecordList PagingRecordList OPTIONAL, -- Need N lateNonCriticalExtension OCTET STRING OPTIONAL, nonCriticalExtension SEQUENCE{} OPTIONAL } PagingRecordList ::= SEQUENCE (SIZE(1..maxNrofPageRec)) OF PagingRecord PagingRecord ::= SEQUENCE { ue-Identity PagingUE-Identity, accessType ENUMERATED {non3GPP} OPTIONAL, -- Need N ... } PagingUE-Identity ::= CHOICE { ng-5G-S-TMSI NG-5G-S-TMSI, fullI-RNTI I-RNTI-Value, ... }
TS 38.304