RRC connection establishment for NB-IoT

Chintareddy, Sravan Reddy and Kuchi, Kiran (2017) RRC connection establishment for NB-IoT. Masters thesis, Indian Institue of Technology Hyderabad.

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Abstract

RRC layer specification is defined in TS 36.331 [1] , and for NB-IoT, the RRC layer specifications are slightly different from that of LTE. In general, RRC connection establishment for LTE and NB-IoT are relatively simple. RRC connection establishment is a 3-way handshake between UE and eNodeB, which is used to make the transition of UE 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. RRC connection establishment procedure has mainly 3 steps. RRC connection request message sent by UE, RRC connection setup sent by enodeB, RRC setup complete messages send by UE. 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. This could be used to allow the delivery of an incoming SMS or notification of an incoming voice call. The initial Non-Access Stratum (NAS) message is transferred as part of the RRC connection es- tablishment procedure [2] to reduce connection establishment delay. RRC connection establishment configures Signalling Radio Bearer (SRB) 1 and (SRB1 bis) allows subsequent signalling to use the Dedicated Control Channel (DCCH) rather than the Common Control Channel (CCCH) used by SRB 0.

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