1. 
   Radio Resource Control
   The Radio Resource Control (RRC) protocol belongs to the UMTS WCDMA protocol stack and handles the control plane signalling of Layer 3 between the UEs (User Equipment) and the UTRAN. It includes: There can only be one RRC connection open to a UE at any one time. == RRC inactivity timers == The conf...
   Found op http://en.wikipedia.org/wiki/Radio_Resource_Control
   
   

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