Telecom Tutorials by Samir Amberkar

LTE - UE States (TAU) [Under LTE]
» E-UTRA and E-UTRAN overall description - 36.300, Rel 8 «
» E-UTRAN access - 23.401, Rel 8 «
» NAS - 24.301, Rel 8 «
» RRC - 36.331, Rel 8 «

Overall NAS/AS states reference: 23.401:4.6, 24.301:5.1.3, 36.300:A.2, 36.331:4.2.1

Cell selection	Bearer contexts active EMM_REGISTERED (NORMAL SERVICE) RRC_CONNECTED	RRC Connection Release ←
	Bearer contexts active EMM_REGISTERED (NORMAL SERVICE) RRC_IDLE (DRBs released)	Cell re-selection, DL synch
23.401:5.3.3.0	Tracking Area Update triggered
	EMM_TAU_INITIATED RRC_IDLE	UL synch/Random access RRC Connection request →
		RRC Connection Setup ← RRC Connection Setup complete → [TAU Request]
	EMM_TAU_INITIATED RRC_CONNECTED
		TAU Accept ←
	EMM_REGISTERED RRC_CONNECTED
24.301:5.3.1.2	case a)   T3440 expired (Active flag was not set in TAU)
	EMM_REGISTERED RRC_IDLE
24.301:5.3.1.2	case b)	RRC Connection Reconfiguration ↔
	EMM_REGISTERED RRC_CONNECTED (DRBs established)

Copyright © Samir Amberkar 2010-12

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