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At what stage before a UE sends attach request, the DCI is seen in the downlink?

0 votes

At what stage before a UE sends attach request, the DCI is seen in the downlink? I assume it's conveyed in the RRC, but not clear where to look for it in the RRC log. May be I'm not searching for the right keyword.

posted Sep 3, 2014 by anonymous

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1 Answer

+1 vote

After reading MIB which comes on PBCH. UE will try to read SIB1 whose repetition is fixed. But location of SIB1 on PDSCH across the bandwidth, UE doesn't know. So, UE will decode PDCCH to find out location of SIB1.
And to decode location of SIBs on PDCCH , UE will read DCI and that DCI will get scrambled with SRNTI. By decoding this information UE can read further system information.

So, the first time UE reads DCI information before attach is at the time of trying to decode SIB1.

answer Sep 22, 2014 by Aarti Jain
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+4 votes

There are couple of procedures are defined which consist of NAS as well as RRC signalling messages exchange.
Some of the NAS message sends to an UE through RRC Connection Reconfiguration message as piggybacked and some as DL Info transfer.

I want to know, Is there any procedure exists in lte when an UE receives RRC Connection Reconfiguration along with NAS message and responds back to network with NAS message first and then Reconfiguration Complete to eNodeB.

Usually, I saw UE sends RRC Connection Reconfiguration Complete message first then NAS response message.

+2 votes

Hi all

Downlink TFTs is used just for P-GW to decide which bearer that packet should go.
It is not useful for UE (or i miss something?)

Therefore, why PGW sends Downlink TFTs to UE?



Find the answer. The answer is include in comment.


+2 votes

I know the fact P-CSCF establishes an IP sec tunnel with the UE but exact at which point it does not sure.

+1 vote

Usually, I always saw when UE sends "S-TMSI" in RRC connection Request message then it definitely sends "Registered MME Information " in RRC Connection Setup Complete message.

I am looking for a scenario on which UE sends "Random number" in RRC Connection Request message and "Registered MME Information" in RRC Connection Setup Complete message.

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