23.1 RRC CONNECTION ESTABLISHMENT - lte-bullets.com

LONG TERM EVOLUTION (LTE) RRC CONNECTION ESTABLISHMENT RRC CONNECTION ESTABLISHMENT is used to make the transition from RRC Idle mode to RRC Connected mode. UE must make the transition to RRC Connected mode before transferring any application data, or completing any signalling procedures The RRC CONNECTION ESTABLISHMENT procedure is always initiated by the UE but can be triggered by either the UE or the network. For example, the UE triggers RRC CONNECTION ESTABLISHMENT if the end-user starts an application to browse the internet, or to send an email. Similarly, the UE triggers RRC CONNECTION ESTABLISHMENT if the UE moves into a new Tracking Area and has to complete the Tracking Area Update signalling procedure. The network triggers the RRC CONNECTION ESTABLISHMENT procedure by sending a Paging message.

RRC Connection Request / SRB 0 / CCCH / UL-SCH / PUSCH RRC Connection Setup Complete / SRB 1 / DCCH / UL-SCH / PUSCH Figure 107 – Signalling for RRC connection establishment The RRC Connection Request message is sent as part of the Random Access procedure. It corresponds to the initial Layer 3 message shown in Figure 84 (section 21.1).

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