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UMTS (RRC states) - 16

RRC states [Under UMTS]
» RRC - 25.331 (esp. Annex B) «
» UE idle mode procedures and cell re-selection procedures in connected mode - 25.304 «

During camping on a cell, UE is said to be in RRC "Idle mode". Once RRC connection is established, it goes in RRC "Connected mode". For simplicity, we will assume that UE does not support GSM radio access. Following diagram shows RRC states and their transitions. State transition scenarios shown in diagram are only to give an idea about the states; refer 3GPP TS 25.331 for details.

As seen above, RRC state determine the channel mapping and also mobility, measurement procedures.

Next step in our discussion is RRC Connection establishment.

References: UMTS by Sanchez and Thioune, and WCDMA for UMTS by Holma and Toskala.

Copyright © Samir Amberkar 2010§

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