Can UE send C-RNTI MAC CE to eNodeB in case of re-establishment?

Question

As UE has valid C-RNTI , can eNodeB confirms same previous RNTI to UE on occasion of successful re-establishment?

Answer 1

Hi,

Yes, If UE includes MAC CE in MSG3 then ENB will confirm the previous valid rnti

Comments

But is it true that UE can Send C-rnti CE in case of Re-establishment?

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Yes, MAC CE will come only in case of contention based RACH (only re-establishment, TA expires,SR unavailable etc).

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As i observed in logs ..... RNTI was changing before and after re-establishment ... If UE can C-RNTI CE eNB should allocate same RNTI even after re-establishment right ?

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Then UE might not send an MAC CE and only sends an RRC reestablishment , then RRC will intimate MAC to delete the old RNTI context.