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What is Pdcch order send by enb to ue?

+4 votes
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What is Pdcch order? Why/when does eNB send Pdcch order to ue and which DCI format use to send the Pdcch order.

posted Nov 28, 2015 by Veer Pal Singh Yadav

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2 Answers

+2 votes

PDCCH order is used for the non-contention based random access procedure. It is sent by eNodeb to UE.
As part of carrier aggregation, UE does random access towards the secondary cells and it is only done by using the PDCCH order.

If UE receives PDCCH order masked with UE's C-RNTI and for a specific serving cell, UE initiates random access procedure towards that serving cell.

DCI format 1A is used by eNodeB to convey PDCCH order to UE.

answer Nov 29, 2015 by Vikram Singh
Do you have any 3gpp refrense that Pdcch order is related to carrier aggregation.
commented Nov 29, 2015 by Veer Pal Singh Yadav
+2 votes

Hi,

PDCCH order is to trigger contention free RACH form UE. Main reason to trigger PDCCH order is to make UL synch of UE, If UE's UL synch is not aligned then ENB will trigger this.

answer Sep 6, 2016 by Jaganathan
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