Which DCI format indicates the PDCCH order from eNB to UE?

Question

Which field in DCI denotes it (PDCCH order) ?

Answer 1

Hi sripathi,

It always uses DCI 1A to notify the PDCCH order..

Comments

Hi jaganathan,

DC! Format 1A is used to schedule resources for a random access response, paging message or system information then if it is for PDCCH order (it should adress with C-RNTI)... right???

If its adressed with c-rnti we can call it as  PDCCH order, otherwise DCI is for  pagging or system information ( yes or no ) ??

Is there any field in DCI information which denotes its for PDCCH order (i didnt found anything)?

---

Hi sripathi,

Yes it will use CRNTI as identifier for DCI1A, there is one field called allocate_prach_flag which will tell pdcch order procedure or not. Based on this flag UE will initiate RACH.

---

HI jaganathan, thanks alot.

Is allocate_prach_flag is implementation specific or any IE as per spec ?

I didnt found any such field in DCI1A...

---

Hi,

It is a menber of DCI 1A. Not implmentation specific.

---

HI,

Carrier Indicator, Forrnat 0 or Format 1A Flag, Localised/Distributed VRB Assignment Flag, Resource Block Allocation, Modulation and Coding Scheme, HARQ Process Number, New Data Indicator, Redundancy Version, TPC Command, Downlink Assignment Index, SRS Request

These fields only i can see in DCI-1A content, But am not able to see allocate_prach_flag ..