If UE doesn't have rrc connection with eNodeB and TAU need to be performed then rrc connection request message is sent to eNodeB with establishment cause "Mobile originating signalling".
RRC Connection Request message carries "Initial UE identity" which is just 5 bytes long identifier. Why does so many information elements send within the "Re-establish UE-Identity" like C-RNTI, physcellId etc ?
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